CA1162833A - Chair seat adjustment assembly - Google Patents
Chair seat adjustment assemblyInfo
- Publication number
- CA1162833A CA1162833A CA000375862A CA375862A CA1162833A CA 1162833 A CA1162833 A CA 1162833A CA 000375862 A CA000375862 A CA 000375862A CA 375862 A CA375862 A CA 375862A CA 1162833 A CA1162833 A CA 1162833A
- Authority
- CA
- Canada
- Prior art keywords
- slide
- adjustment assembly
- shoulder
- generally
- slot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
- A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
- A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
- A47C1/03266—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with adjustable elasticity
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
- A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
- A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
- A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
- A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs
- A47C1/03274—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs of torsion type
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
- A47C1/03294—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest slidingly movable in the base frame, e.g. by rollers
Abstract
ABSTRACT OF THE DISCLOSURE
The specification discloses a seat pitch adjustment assembly which a user can adjust upwardly or downwardly with basically the same applied force. A seat support is pivotally mounted with respect to a supporting assembly at one point and is joined thereto at another point through a pivot bracket.
The pivot bracket is pivotally mounted to the support assembly on one pivot axis and to the seat support on a second pivot axis. The pivot bracketing includes a cylindrical wall defining at least a portion of the wall of a right circular cylinder whose axis of revolution lies on the aforesaid second pivot axis. The cylindrical wall includes at least one helically oriented slot receiving a projection from a slide slidably mounted on the seat support member whereby movement of the slide one way or the other rotates the pivot bracket about said second pivot axis and thereby changes the relative elevation of the first pivot axis with respect thereto. This in turn changes the pitch of the seat support with respect to the underlying support assembly and thereby changes the pitch of a seat mounted thereon.
The specification discloses a seat pitch adjustment assembly which a user can adjust upwardly or downwardly with basically the same applied force. A seat support is pivotally mounted with respect to a supporting assembly at one point and is joined thereto at another point through a pivot bracket.
The pivot bracket is pivotally mounted to the support assembly on one pivot axis and to the seat support on a second pivot axis. The pivot bracketing includes a cylindrical wall defining at least a portion of the wall of a right circular cylinder whose axis of revolution lies on the aforesaid second pivot axis. The cylindrical wall includes at least one helically oriented slot receiving a projection from a slide slidably mounted on the seat support member whereby movement of the slide one way or the other rotates the pivot bracket about said second pivot axis and thereby changes the relative elevation of the first pivot axis with respect thereto. This in turn changes the pitch of the seat support with respect to the underlying support assembly and thereby changes the pitch of a seat mounted thereon.
Description
~lG2~3 BACKGROUND OF THE INVENTION
The present invention relates to mechanisms for chairs which adjust the pitch of the seat -from front to rear. Often, different users of the same chair would like the chair to be pitched differently. Some might like the front lip of the chair to be higher and others might like it to be lower.
A number of cumbersome alternatives have been proposed in prior United States patents for achieving these results, although it is not known whether any have been uti-lized commercially. Patent 3,362,746 to Huyge issued January 9, 1968 disclosed a rachet type mechanism for ad-justing the pitch of a vehicle seat. The two patents to Costin 4,054,318 issuing October 18, 1977 and 3,954,245 issuing May 4, 1976 both disclose a cam-type of arrangement for changing the elevation of the front of a seat. Patents
The present invention relates to mechanisms for chairs which adjust the pitch of the seat -from front to rear. Often, different users of the same chair would like the chair to be pitched differently. Some might like the front lip of the chair to be higher and others might like it to be lower.
A number of cumbersome alternatives have been proposed in prior United States patents for achieving these results, although it is not known whether any have been uti-lized commercially. Patent 3,362,746 to Huyge issued January 9, 1968 disclosed a rachet type mechanism for ad-justing the pitch of a vehicle seat. The two patents to Costin 4,054,318 issuing October 18, 1977 and 3,954,245 issuing May 4, 1976 both disclose a cam-type of arrangement for changing the elevation of the front of a seat. Patents
2,221,268 to Sears, issued November 12, 1940; 2,638,150 to May, issued ~lay 12~ 1953 and 2,646,839 to Hillman, issued July 28, 1953 similarly disclose cam arrangements for changing the elevation of the front of a vehicle seat, and therefore, for changing the pitch of the seat.
U.S. Patent 4,076,308 to Slabon et al. issued February 28, 1978 introduces a seat pitch adjustment mecha-nism into a chair control. Chair controls normally function solely to control the rate of tilting of an office-type chair. In the Slabon proposed mechanism, wedge blocks slide on ramps and are held in place by bolts. The bolts can be loosened with a tooi so that the wedges can be slid to there-by change the pitch of the seat.
All of these mechanisms are cumbersome and tedious q~
~ ~.62W~
1 to operate. A noticeably greater force is required to adjust the pitch of the seats up than down. The Slabon mechanism is particularly tedious in that one has to first loosen bolts, slide wedges up or down a ramp, then make certain that both wedges are slid equally so that the pitch adjust-ment is the same on either side of the seat, and then re-tighten the bolts.
SU~ARY O~ TIIE INVENTION
The present invention comprises a chair seat pitcll adjustment assembly in which the force which the user must apply to effect adjustment is basically the same whether he is adjusting the pitch upwardly or downwardly. The adjustment means employed in the assembly of the present invention includes a pivot bracket pivotally mounted to a first support means on one pivot axis and to a seat support member on a second pivot axis. The seat support member is in turn pivotally mounted at yet another spaced point to the first support means. The pivot bracket includes a ~ cylindrical wall extending generally laterally reIative to ; 20 the s-ides of the seat support. The cylindrical wall defines at least a portion of the wall of a right circular cylinder whose axis of revolution lies on the aforesaid second pivot axis. This cylindrical wall includes at least one helically oriented slot therein. A slide member is slidably mounted on the seat support member and includes projection means projecting through the helical slot whereby as the slide is moved laterally, the cylindrical wall and accordingly the pivot bracket are rotated about the second pivot axis, thereby changingthe relative elevation of the first pivot axis with respect thereto, and thereby effectively changing the pitch of a seat mounted on the seat support.
~33 These and other objects and advantages will be more fully understood and appreciated by reference to the written specification and appended drawings.
BRIEF DESCRIPTION OF THE DRAWIN_ Figure 1 is a plan view of a chair control made in accordance with the present invention;
Figure 2 is a fragmentary cross-sectional view taken generally along planes II-II of Figure 1, showing only the right side seat support stretcher and back support arm (as viewed in Figure 1) and eliminating certain parts for clarification purposes;
Figure 3 is the same view as Figure 2, but with the chair control in the position which it assumes when a person leans back in a chair to which the chair control is attached;
Figure 4 is a side elevational view of the chair control with some of the internal components being shown in hidden lines;
Figure 5 is a top plan view of the chair seat support-ing assembly shown in Figure li Figure 6 is a side elevational view of the assemblyof Figure 5;
Figure 7 is a top plan view oE the seat adjustment pivot bracket shown in Figure l;
Figure 8 is a cross-sectional view thereof taken along plane VIII-VIII Of Figure 7;
Figure 9 is a top plan view of the pivot bracket insert shown in Figure l;
Figure 10 is a cross-sectional view thereof taken along plane X-X of Figure 9, Figure ll is a cross-sectional view thereof taken along plane XI-XI of Figure 9;
Eigure 12 is a cross-sect:ional view thereof taken along plane XII-XII o-f Figure 9;
Figure 13 is a top plan view of the seat adjustment slide shown in Figure 2; and Figure 14 is a side elevational view of the slide of Figure 13.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the preferred embodiment, the seat adjustment assembly of the present invention is incorporated into a chair control 1 (Figs. 1-4). Chair control 1 comprises a stationary control housing 10 which houses a bias means 30 (Figs. l and 4). The degree of pretension on bias means 30 is controlled by tension bolt assembly 40. Chair back sup-port arms 60 are secured to the ends of the arbor 31 of bias means 30 and pivot with respect to stationary control housing 10. Chair seat support stretcher assembly 70 is pivotally mounted at its rear directly to back support arms 60. The front of seat support assembly 70 is slidably mounted within tracks 20 on the front of stationary control housing 10.
This slidable mount is through seat adjustment assembly 80 described more fully hereinbelow. Seat adjustment assem~ly 80 is the key feature of chair control 1 with respect to the present invention.
In the broader aspects of the present invention, seat support 70 could be mounted pivotally directly to stationary member 10 rather than to back support arms 60 which in turn are mounted pivotally to stationary member 10. Alternative-ly for purposes of the present invention, one might simply think of back support arms 60 as part of a 1 first support assembly with stationary control housing 10.
Further, the invention wouldnot have to be incor-porated into a chair control and accordingly in its broader aspects, bias means 30 could be eliminated. Other features are shown in the drawings which may be briefly referred to below which are desirable, but which are not essential to the present invention. Hence, they are not described in detail herein.
Stationary control housing 10 is a stamped or otherwise formed metal dish having a bottom wall 11, side walls 12, a front wall 13 and rear wall 14 ~Figs. 2 and 3).
A lip 15 extends around the upper periphery ~see Fig. 2).
There is an aperture in bottom 11 through which the upper end of column 2 extends. A mounting plate 16 is welded to the inside of housing 10 and includes an aperture 17 therein to also receive the upper end of column assembly 2 ~Figs.
1 and 2).
Projecting forwardly from front wall 3 are a pair of track brackets 20. These are formed of metal by bending them so as to define a top wall 21, a bottom wall 22 and a front wall 23. These basically define the track in which seat support assembly 70 is slidably mounted. Extending downwardly from bottom wall 22 is a front brace 24 and then bent inwardly from front brace 24 to form the bottom brace 25. The rear portion of top wall 21, front brace 24 and bottom bracket 25are welded to stationary control housing lO to hold track brackets 20 in place.
Bias means 30 comprises a torsional coil spring arrangement. An arbor 31 which is generally circular in cross-sectional configuration extends through holes 17 in side walls 12 of stationary control housing 10 ~compare to ~L~833 1 Figs. 1 and 2). Arbor 31 is actually hidden in Figure 1 since it is covered by a plastic sleeve 34. The ends of arbor 31 are rotatably carried in end bearings 35 which are located within side wall holes 17. Coiled around arbor 31 and sleeve 34 are a pair of coil springs 32. The front ends 32a of coil springs 32 are captured under retainer nut 59 of tension bolt assembly 40, captured in notches and between the side walls thereof. The rear ends 32b of springs 32 are captured under the chair back support arms 60. Tension adjustment is achieved by tightening or loosening tension bolt 40 in retainer nut 59. Basically, tension adjustment bolt assembly 40 comprises a bolt 40a having a hollow shank normally housing a lever 47. One can grasp a gripping cap 51, retract lever 47, pivot it to one side into a slot 43a and rotate it to thread bolt 40a up~or down in retainer 59.
Chair back support arms 60 are formed of metal and are preferably channel shaped in cross section having a top wall 63, a side wall 64 and a bottom wall 65 (Fig. 2).
There are two such chair back mounting arms 60, one located on either side of stationary housing 10 (Fig. 1). The generally channel shape cross section allows one to slip a chair back support frame or arm into the channels.
The arbor mounting hole or holes 61 in the side wall 64 of chair back support arm 60 is visible through the hole 17 in the side of stationary housing 10 in Figure 2.
There are two semi-circles 61 spaced by a bridge 62. The ends of arbor 30 are slotted so that they fit into the semi-circles 61. In this way, chair back support arms 60 are fixed against rotation with respect to arbor 30 and as one tilts back in the chair, chair back support arms 60 pivot and arbor 30 rotates within its plastic end bearings 35.
~L~3 1 On top wall 63 of each support arm 60, located toward the front thereof are a pair of downwardly projecting dimples or protrusions 69 ~Fig. 2). The rear end 32b of each coil spring 30 is captured between dimples 69. The other protrusions shown projecting up from top wall 63 are merely reinforcing ribs.
Located about midway along the length of each chair back support arm 60 is a hole 66 which is adapted to receive the rear axle 68 and suitable bearing 68a. It is on rear axle 68 that the rear of chair seat support assembly 70 is pivotally carried.
The chair seat support assembly 70 comprises a pair of spaced stretchers 70a joined at the front by front piece 74 (Figs. 1, 2, 5 and 6). Each side stretcher 70a is lS formed of steel to define a top ledge 71 and a side wall 72.
There are mounting holes 76 in top ledges 71 to facilitate mounting chair control 1 to the bottom of a chair seat.
Located towards the rear of each side wall 72 of each stretcher 70a is a rear axle receiving hole 79 (Fig. 6) which receives the end of rear axle 68 carried in a suitable plastic bearing of "T" shaped longitudinal cross section 79a (Fig. 1). Of course, suitable retainer clips 79b or the like then ho]d rear axle 68 in position ~hidden in Fig. 1).
The front piece 74 which is welded to and thereby joined to side stretchers 70a is generally "J" shaped having a bottom wall 74a, a front wall 74b and a top lip 74c.~
Bottom wall 74a includes a pair of spaced slots 75 therein for cooperating with components of seat adjustment assembly 80.
One slot is located toward one side stretcher 70a and the other slot towards the other.
Another feature of seat stretcher 70 which is ~L1~83~3 1 especially adapted to cooperate with seat adjustment assembly 80 is the large generally rectangular opening 73 towards the front of each side wall 72 of each stretcheT 70a (Figs. 4 and 6). Th'e forwardmost holes 73a in each side wall 72 of each stretcher 70a similarly facilitate mounting of seat adjustment assembly 80 to stretcher assembly 70. The details of this cooperation are set forth more fully hereinbelow.
Seat adjustment assembly 80 comprises first o:E all a pivot bracket al which is pivotally mounted between side stretchers 70a of stretcher assembly 70 via pivot nut, bolt and washer assemblies 82 through holes 73a (Figs. 1, 2, 7 and 8). Pivot bracket 81 comprises a pair of spaced, short legs 81a joined by a cylindrical bottom wall 81b.
AIl are formed of metal and are welded together or alter-natively formed from a single piece.
The hole 82a towards the front of each side wall 81a through which the bolt of nut, bolt and washer assembly 82 passes can be seen in Figure 8. Referring to Figure 7, it will be seen that there are a pair of spaced slots 83 in bottom wall 81b of pivot bracket 81. Each slot 83 is generally spirally or helically oriented in the cylindrical bottom wall 81b. When pivot bracket 81 is pivotally secured in position in seat support stretcher assembly 70, helical slots 83 line up above slots 75, with bottom wall 81b possibly but not necessarily contacting bottom wall 74a of front piece 74 of seat support assembly 70. However, slots 83 are slanted relative to slots 75 such that they overlap only at selected points at any given time.
The particular points at which slots 83 line up with slots 75 is determined by adjustment slide 90 (Pigs.
1 2, 4, 13 and 14). Adjustment slide 90 comprises a flat bottom plate 91 having a gripper flange 92 projecting downwardly from the bottom thereof. Protruding upwardly from bottom plate 91 are a pair of spaced bolts 93. Bottom plate 91 including gripper 92 is molded of plastic, andbolts 93 are square cross section shoulder bolts which are molded in place in the plastic. A raised locating shoulder 96 around each bolt 93 is also integrally molded of the plastic material with plate 91 and gripper 92.
In assembly, bolts 93 project upwardly through slots 75 and 83, with each locating shoulder 96 fitting snugly within one of said slots 75 in the bottom wall 74a of front piece 74 of seat support assembly 70. ~ore specifically, the square cross sectionedshank 95 of each bolt 93 extends upwardly through the slot 88 in a molded plastic pivot bracket insert 86 (Figs. 9-12 as well as Figs. 1, 2, and 4). Pivot bracket inserts 86 are made of a self lubricating type of plastic such as a glass reinforced nylon in order to minimize friction in the seat adjustment assembly. It will be noted that each insert 86 is cylindrical in cross-sectional configuration so that it seats snugly against the cylindrical cross-sectional configuration of the bottom wall 81b of pivot bTacket 81. The slot 88 in pivot brac~et insert 86 is similarly helical in shape so that it matches with slot 83.
It will be further noted that each slot 88 is framed by a peripheral, downward]y projecting lip 87 which actually extends into and through the receiving slot 83. The helical configuration of lip 87 can be appreciated by reference to the three cross sections shown in Figures 10, 11 and 12.
Because of the diference between the generally rectilinear slot 75 in seat support front piece 74 as g ~z~
1 distinguished from the helical slot 88 in pivot bracket inserts 86, it will be noted by reference to Figure 13 that the plastic guide or locating shoulders 96 at the base of each upwardly projecting bolt 93 are generally rectangular S in configuration and are oriented parallel to the longitu-dinal axis of seat adjustment slide 90. Thus, these locating shoulders 96 sit nicely in slots 75 and slide readily from one end thereof to the other However, the generally rectangular shank or shoulder 95 of shoulder bolts 93 are cocked at a slight angle with respect to the longitudinal axis of slide 90. This is accomplished by embedding shoulder bolts 93 at a cocked angle that can be seen from the outline of the heads 94 of the bolts which are embedded in the plastic of bottom plate 91.
These cocked, generally rectangular shanks or shoulders 95 then fit readily into slots 88 and slide readily along the length thereof.
Projecting upwardly from the cocked shoulder 95 of bolts 93 are the threaded upper ends 95a. Referring to Figures 1, 2 and 4, it will be understood that a washer of generally solidsemi-cylindrical, lateral cross section fits over the threaded portion 95a of each bolt 93 and the cylin-drical wall portion of each washer 97 seats down in the cylindrical nest defined by pivot bracket inserts 86.
Flanged nuts 98 are then threaded down onto threaded ends 95a of bolts 93. The components are dimensioned such that washer 97 rests on top ofshoulder or shank 95 without tightening pivot bracket inserts 86 and pivot bracket 81 too tight against the bottom wall 74a of seat stretcher front piece 74. This allows one to slide seat adjustment slide 90 to the left or to the right relative to the front of chair ~3:3 1 control 1, thereby changing that portion of slots 88 and 83 which overlie the longitudinally oriented slots 75 of seat stretcher front piece 74. In effect, this causes pivot bracket 81 to rotate about its pivotal mounting via nut, washer and bolt assemblies 82 to seat stretcher assembly 70.
Such rotation shifts the elevation of the left end of each leg 81a of pivot bracket 81 with respect to the side stretchers 7Oa of seat stretcher assembly 70.
The purpose of this change in elevation is to change the effective angle or elevation of the front of a chair seat mounted on chair control 1. Located at the left end as viewed in Figures 2, 4 and 8 of pivot bracket 81 is an axle receiving hole 84. A front slide axle 89 extends through the axle receiving holes 84 in the opposite pivot bracket legs 81a. The ends of the axle 89 are carried in suitable bearings 89a. .
Axle 89 passes through the lateral openings in track brackets 20 at the front of stationary control housing 10 whereby pivot bracket 81 is pivotally mounted to stationary housing 10. Within the confines of each track bracket 20, axle 89 is carried in a plastic bushing 99 of generally rectangular cross section ~Figs. 1 and 2). Retainer clips or rings 99a (Fig. 1) hold the plastic bushing 99 and axle 89 in position within track brackets 99. With the ends of pivot bracket legs 81a thus assemblied to the front of stationary control housing 10, the pivoting of pivot bracket 81 by changing the position of slide 90 thereby changes the elevation of the front of seat support assembly 70 with respect to the front of stationary control housing 10. This then facilitates adjustment of the seat angle by the user of the 11~83~3 1 chair to which chair control 1 is mounted.
In the broader aspects of this invention, stationary housing 10 and back supports 60 can be viewed as a single support assembly with seat supports 70 pivotally joined thereto. Even if there were no provision for seat tilting, this invention could be used in the broadest sense to simply adjust seat angle with respect to a support means or assembly.
Bushings 99 are preferably formed of a self-lubricating plastic material of the type commonly used to minimize friction. An example of such a plastic would be the acetal type, available from Dupont as "Delrin" ~ and from Celanese as "Celcon" ~. This enables bushings 99 to slide along the length of track brackets 20.
Such sliding action takes place when the user of a chair to which chair control 1 is mounted leans back in the chair. In leaning back, he causes chair back support arms 90 to pivot about their pivot point with respect to stationary housing 10. Similarly, chair seat support assembly 70 tilts rearwardly since it is pivotally connected directly to back support arms 60 at axle 68. At the same time, front axle 89 and bushings 99 slide rearwardly within track brackets 20. The enlarged openings 73 in the side stretchers 70a allow clearance for the ends of axle 89 to move up and down and slide. A comparison of chair control 1 in its untilted ancl tilted back positions respectively can be seen by comparing Figures 2 and 3.
Also, the sliding interconnection between stationary member 10 and pivot axle 89 allows pivot axle 89 to shift as pivot bracket 81 is rotated. At some point, there has to be means allowing at least one connection between said housing 10 -12~
1 to shift vis-a-vis seat support 70 when pivot bracket 81 is rotated.
If the chair user wishes to change the angle of the chair seat, he simply reaches under the seat, grasps gripper 92 and moves adjustment slide 90 to either the left or right, depending on which way he wants to adjust the seat angle. This movement causes upwardly projecting bolts 93 to slide in slots 75 of seat support stretcher assembly 70 and in helical slots 88 and 83 of pivot bracket inserts 86 and pivot bracket 81 respectively. Because slots 88 and 83 are helical and thus skewed slightly with respect to slots 75, such movement of bolts 93 causes pivot bracket 81 to pivot about its pivot mountings 82, which in turn changes the elevation of front axle 89 with respect to the front of seat stretcher assembly 70. This, of course, results in changing the seat angle.
Of course, it is understood that the above is merely a preferred embodiment of the invention and that various changes and alterations can be made without departing from the spirit and broader aspects thereof as more par-: ticularly defined in the appended claims.
U.S. Patent 4,076,308 to Slabon et al. issued February 28, 1978 introduces a seat pitch adjustment mecha-nism into a chair control. Chair controls normally function solely to control the rate of tilting of an office-type chair. In the Slabon proposed mechanism, wedge blocks slide on ramps and are held in place by bolts. The bolts can be loosened with a tooi so that the wedges can be slid to there-by change the pitch of the seat.
All of these mechanisms are cumbersome and tedious q~
~ ~.62W~
1 to operate. A noticeably greater force is required to adjust the pitch of the seats up than down. The Slabon mechanism is particularly tedious in that one has to first loosen bolts, slide wedges up or down a ramp, then make certain that both wedges are slid equally so that the pitch adjust-ment is the same on either side of the seat, and then re-tighten the bolts.
SU~ARY O~ TIIE INVENTION
The present invention comprises a chair seat pitcll adjustment assembly in which the force which the user must apply to effect adjustment is basically the same whether he is adjusting the pitch upwardly or downwardly. The adjustment means employed in the assembly of the present invention includes a pivot bracket pivotally mounted to a first support means on one pivot axis and to a seat support member on a second pivot axis. The seat support member is in turn pivotally mounted at yet another spaced point to the first support means. The pivot bracket includes a ~ cylindrical wall extending generally laterally reIative to ; 20 the s-ides of the seat support. The cylindrical wall defines at least a portion of the wall of a right circular cylinder whose axis of revolution lies on the aforesaid second pivot axis. This cylindrical wall includes at least one helically oriented slot therein. A slide member is slidably mounted on the seat support member and includes projection means projecting through the helical slot whereby as the slide is moved laterally, the cylindrical wall and accordingly the pivot bracket are rotated about the second pivot axis, thereby changingthe relative elevation of the first pivot axis with respect thereto, and thereby effectively changing the pitch of a seat mounted on the seat support.
~33 These and other objects and advantages will be more fully understood and appreciated by reference to the written specification and appended drawings.
BRIEF DESCRIPTION OF THE DRAWIN_ Figure 1 is a plan view of a chair control made in accordance with the present invention;
Figure 2 is a fragmentary cross-sectional view taken generally along planes II-II of Figure 1, showing only the right side seat support stretcher and back support arm (as viewed in Figure 1) and eliminating certain parts for clarification purposes;
Figure 3 is the same view as Figure 2, but with the chair control in the position which it assumes when a person leans back in a chair to which the chair control is attached;
Figure 4 is a side elevational view of the chair control with some of the internal components being shown in hidden lines;
Figure 5 is a top plan view of the chair seat support-ing assembly shown in Figure li Figure 6 is a side elevational view of the assemblyof Figure 5;
Figure 7 is a top plan view oE the seat adjustment pivot bracket shown in Figure l;
Figure 8 is a cross-sectional view thereof taken along plane VIII-VIII Of Figure 7;
Figure 9 is a top plan view of the pivot bracket insert shown in Figure l;
Figure 10 is a cross-sectional view thereof taken along plane X-X of Figure 9, Figure ll is a cross-sectional view thereof taken along plane XI-XI of Figure 9;
Eigure 12 is a cross-sect:ional view thereof taken along plane XII-XII o-f Figure 9;
Figure 13 is a top plan view of the seat adjustment slide shown in Figure 2; and Figure 14 is a side elevational view of the slide of Figure 13.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the preferred embodiment, the seat adjustment assembly of the present invention is incorporated into a chair control 1 (Figs. 1-4). Chair control 1 comprises a stationary control housing 10 which houses a bias means 30 (Figs. l and 4). The degree of pretension on bias means 30 is controlled by tension bolt assembly 40. Chair back sup-port arms 60 are secured to the ends of the arbor 31 of bias means 30 and pivot with respect to stationary control housing 10. Chair seat support stretcher assembly 70 is pivotally mounted at its rear directly to back support arms 60. The front of seat support assembly 70 is slidably mounted within tracks 20 on the front of stationary control housing 10.
This slidable mount is through seat adjustment assembly 80 described more fully hereinbelow. Seat adjustment assem~ly 80 is the key feature of chair control 1 with respect to the present invention.
In the broader aspects of the present invention, seat support 70 could be mounted pivotally directly to stationary member 10 rather than to back support arms 60 which in turn are mounted pivotally to stationary member 10. Alternative-ly for purposes of the present invention, one might simply think of back support arms 60 as part of a 1 first support assembly with stationary control housing 10.
Further, the invention wouldnot have to be incor-porated into a chair control and accordingly in its broader aspects, bias means 30 could be eliminated. Other features are shown in the drawings which may be briefly referred to below which are desirable, but which are not essential to the present invention. Hence, they are not described in detail herein.
Stationary control housing 10 is a stamped or otherwise formed metal dish having a bottom wall 11, side walls 12, a front wall 13 and rear wall 14 ~Figs. 2 and 3).
A lip 15 extends around the upper periphery ~see Fig. 2).
There is an aperture in bottom 11 through which the upper end of column 2 extends. A mounting plate 16 is welded to the inside of housing 10 and includes an aperture 17 therein to also receive the upper end of column assembly 2 ~Figs.
1 and 2).
Projecting forwardly from front wall 3 are a pair of track brackets 20. These are formed of metal by bending them so as to define a top wall 21, a bottom wall 22 and a front wall 23. These basically define the track in which seat support assembly 70 is slidably mounted. Extending downwardly from bottom wall 22 is a front brace 24 and then bent inwardly from front brace 24 to form the bottom brace 25. The rear portion of top wall 21, front brace 24 and bottom bracket 25are welded to stationary control housing lO to hold track brackets 20 in place.
Bias means 30 comprises a torsional coil spring arrangement. An arbor 31 which is generally circular in cross-sectional configuration extends through holes 17 in side walls 12 of stationary control housing 10 ~compare to ~L~833 1 Figs. 1 and 2). Arbor 31 is actually hidden in Figure 1 since it is covered by a plastic sleeve 34. The ends of arbor 31 are rotatably carried in end bearings 35 which are located within side wall holes 17. Coiled around arbor 31 and sleeve 34 are a pair of coil springs 32. The front ends 32a of coil springs 32 are captured under retainer nut 59 of tension bolt assembly 40, captured in notches and between the side walls thereof. The rear ends 32b of springs 32 are captured under the chair back support arms 60. Tension adjustment is achieved by tightening or loosening tension bolt 40 in retainer nut 59. Basically, tension adjustment bolt assembly 40 comprises a bolt 40a having a hollow shank normally housing a lever 47. One can grasp a gripping cap 51, retract lever 47, pivot it to one side into a slot 43a and rotate it to thread bolt 40a up~or down in retainer 59.
Chair back support arms 60 are formed of metal and are preferably channel shaped in cross section having a top wall 63, a side wall 64 and a bottom wall 65 (Fig. 2).
There are two such chair back mounting arms 60, one located on either side of stationary housing 10 (Fig. 1). The generally channel shape cross section allows one to slip a chair back support frame or arm into the channels.
The arbor mounting hole or holes 61 in the side wall 64 of chair back support arm 60 is visible through the hole 17 in the side of stationary housing 10 in Figure 2.
There are two semi-circles 61 spaced by a bridge 62. The ends of arbor 30 are slotted so that they fit into the semi-circles 61. In this way, chair back support arms 60 are fixed against rotation with respect to arbor 30 and as one tilts back in the chair, chair back support arms 60 pivot and arbor 30 rotates within its plastic end bearings 35.
~L~3 1 On top wall 63 of each support arm 60, located toward the front thereof are a pair of downwardly projecting dimples or protrusions 69 ~Fig. 2). The rear end 32b of each coil spring 30 is captured between dimples 69. The other protrusions shown projecting up from top wall 63 are merely reinforcing ribs.
Located about midway along the length of each chair back support arm 60 is a hole 66 which is adapted to receive the rear axle 68 and suitable bearing 68a. It is on rear axle 68 that the rear of chair seat support assembly 70 is pivotally carried.
The chair seat support assembly 70 comprises a pair of spaced stretchers 70a joined at the front by front piece 74 (Figs. 1, 2, 5 and 6). Each side stretcher 70a is lS formed of steel to define a top ledge 71 and a side wall 72.
There are mounting holes 76 in top ledges 71 to facilitate mounting chair control 1 to the bottom of a chair seat.
Located towards the rear of each side wall 72 of each stretcher 70a is a rear axle receiving hole 79 (Fig. 6) which receives the end of rear axle 68 carried in a suitable plastic bearing of "T" shaped longitudinal cross section 79a (Fig. 1). Of course, suitable retainer clips 79b or the like then ho]d rear axle 68 in position ~hidden in Fig. 1).
The front piece 74 which is welded to and thereby joined to side stretchers 70a is generally "J" shaped having a bottom wall 74a, a front wall 74b and a top lip 74c.~
Bottom wall 74a includes a pair of spaced slots 75 therein for cooperating with components of seat adjustment assembly 80.
One slot is located toward one side stretcher 70a and the other slot towards the other.
Another feature of seat stretcher 70 which is ~L1~83~3 1 especially adapted to cooperate with seat adjustment assembly 80 is the large generally rectangular opening 73 towards the front of each side wall 72 of each stretcheT 70a (Figs. 4 and 6). Th'e forwardmost holes 73a in each side wall 72 of each stretcher 70a similarly facilitate mounting of seat adjustment assembly 80 to stretcher assembly 70. The details of this cooperation are set forth more fully hereinbelow.
Seat adjustment assembly 80 comprises first o:E all a pivot bracket al which is pivotally mounted between side stretchers 70a of stretcher assembly 70 via pivot nut, bolt and washer assemblies 82 through holes 73a (Figs. 1, 2, 7 and 8). Pivot bracket 81 comprises a pair of spaced, short legs 81a joined by a cylindrical bottom wall 81b.
AIl are formed of metal and are welded together or alter-natively formed from a single piece.
The hole 82a towards the front of each side wall 81a through which the bolt of nut, bolt and washer assembly 82 passes can be seen in Figure 8. Referring to Figure 7, it will be seen that there are a pair of spaced slots 83 in bottom wall 81b of pivot bracket 81. Each slot 83 is generally spirally or helically oriented in the cylindrical bottom wall 81b. When pivot bracket 81 is pivotally secured in position in seat support stretcher assembly 70, helical slots 83 line up above slots 75, with bottom wall 81b possibly but not necessarily contacting bottom wall 74a of front piece 74 of seat support assembly 70. However, slots 83 are slanted relative to slots 75 such that they overlap only at selected points at any given time.
The particular points at which slots 83 line up with slots 75 is determined by adjustment slide 90 (Pigs.
1 2, 4, 13 and 14). Adjustment slide 90 comprises a flat bottom plate 91 having a gripper flange 92 projecting downwardly from the bottom thereof. Protruding upwardly from bottom plate 91 are a pair of spaced bolts 93. Bottom plate 91 including gripper 92 is molded of plastic, andbolts 93 are square cross section shoulder bolts which are molded in place in the plastic. A raised locating shoulder 96 around each bolt 93 is also integrally molded of the plastic material with plate 91 and gripper 92.
In assembly, bolts 93 project upwardly through slots 75 and 83, with each locating shoulder 96 fitting snugly within one of said slots 75 in the bottom wall 74a of front piece 74 of seat support assembly 70. ~ore specifically, the square cross sectionedshank 95 of each bolt 93 extends upwardly through the slot 88 in a molded plastic pivot bracket insert 86 (Figs. 9-12 as well as Figs. 1, 2, and 4). Pivot bracket inserts 86 are made of a self lubricating type of plastic such as a glass reinforced nylon in order to minimize friction in the seat adjustment assembly. It will be noted that each insert 86 is cylindrical in cross-sectional configuration so that it seats snugly against the cylindrical cross-sectional configuration of the bottom wall 81b of pivot bTacket 81. The slot 88 in pivot brac~et insert 86 is similarly helical in shape so that it matches with slot 83.
It will be further noted that each slot 88 is framed by a peripheral, downward]y projecting lip 87 which actually extends into and through the receiving slot 83. The helical configuration of lip 87 can be appreciated by reference to the three cross sections shown in Figures 10, 11 and 12.
Because of the diference between the generally rectilinear slot 75 in seat support front piece 74 as g ~z~
1 distinguished from the helical slot 88 in pivot bracket inserts 86, it will be noted by reference to Figure 13 that the plastic guide or locating shoulders 96 at the base of each upwardly projecting bolt 93 are generally rectangular S in configuration and are oriented parallel to the longitu-dinal axis of seat adjustment slide 90. Thus, these locating shoulders 96 sit nicely in slots 75 and slide readily from one end thereof to the other However, the generally rectangular shank or shoulder 95 of shoulder bolts 93 are cocked at a slight angle with respect to the longitudinal axis of slide 90. This is accomplished by embedding shoulder bolts 93 at a cocked angle that can be seen from the outline of the heads 94 of the bolts which are embedded in the plastic of bottom plate 91.
These cocked, generally rectangular shanks or shoulders 95 then fit readily into slots 88 and slide readily along the length thereof.
Projecting upwardly from the cocked shoulder 95 of bolts 93 are the threaded upper ends 95a. Referring to Figures 1, 2 and 4, it will be understood that a washer of generally solidsemi-cylindrical, lateral cross section fits over the threaded portion 95a of each bolt 93 and the cylin-drical wall portion of each washer 97 seats down in the cylindrical nest defined by pivot bracket inserts 86.
Flanged nuts 98 are then threaded down onto threaded ends 95a of bolts 93. The components are dimensioned such that washer 97 rests on top ofshoulder or shank 95 without tightening pivot bracket inserts 86 and pivot bracket 81 too tight against the bottom wall 74a of seat stretcher front piece 74. This allows one to slide seat adjustment slide 90 to the left or to the right relative to the front of chair ~3:3 1 control 1, thereby changing that portion of slots 88 and 83 which overlie the longitudinally oriented slots 75 of seat stretcher front piece 74. In effect, this causes pivot bracket 81 to rotate about its pivotal mounting via nut, washer and bolt assemblies 82 to seat stretcher assembly 70.
Such rotation shifts the elevation of the left end of each leg 81a of pivot bracket 81 with respect to the side stretchers 7Oa of seat stretcher assembly 70.
The purpose of this change in elevation is to change the effective angle or elevation of the front of a chair seat mounted on chair control 1. Located at the left end as viewed in Figures 2, 4 and 8 of pivot bracket 81 is an axle receiving hole 84. A front slide axle 89 extends through the axle receiving holes 84 in the opposite pivot bracket legs 81a. The ends of the axle 89 are carried in suitable bearings 89a. .
Axle 89 passes through the lateral openings in track brackets 20 at the front of stationary control housing 10 whereby pivot bracket 81 is pivotally mounted to stationary housing 10. Within the confines of each track bracket 20, axle 89 is carried in a plastic bushing 99 of generally rectangular cross section ~Figs. 1 and 2). Retainer clips or rings 99a (Fig. 1) hold the plastic bushing 99 and axle 89 in position within track brackets 99. With the ends of pivot bracket legs 81a thus assemblied to the front of stationary control housing 10, the pivoting of pivot bracket 81 by changing the position of slide 90 thereby changes the elevation of the front of seat support assembly 70 with respect to the front of stationary control housing 10. This then facilitates adjustment of the seat angle by the user of the 11~83~3 1 chair to which chair control 1 is mounted.
In the broader aspects of this invention, stationary housing 10 and back supports 60 can be viewed as a single support assembly with seat supports 70 pivotally joined thereto. Even if there were no provision for seat tilting, this invention could be used in the broadest sense to simply adjust seat angle with respect to a support means or assembly.
Bushings 99 are preferably formed of a self-lubricating plastic material of the type commonly used to minimize friction. An example of such a plastic would be the acetal type, available from Dupont as "Delrin" ~ and from Celanese as "Celcon" ~. This enables bushings 99 to slide along the length of track brackets 20.
Such sliding action takes place when the user of a chair to which chair control 1 is mounted leans back in the chair. In leaning back, he causes chair back support arms 90 to pivot about their pivot point with respect to stationary housing 10. Similarly, chair seat support assembly 70 tilts rearwardly since it is pivotally connected directly to back support arms 60 at axle 68. At the same time, front axle 89 and bushings 99 slide rearwardly within track brackets 20. The enlarged openings 73 in the side stretchers 70a allow clearance for the ends of axle 89 to move up and down and slide. A comparison of chair control 1 in its untilted ancl tilted back positions respectively can be seen by comparing Figures 2 and 3.
Also, the sliding interconnection between stationary member 10 and pivot axle 89 allows pivot axle 89 to shift as pivot bracket 81 is rotated. At some point, there has to be means allowing at least one connection between said housing 10 -12~
1 to shift vis-a-vis seat support 70 when pivot bracket 81 is rotated.
If the chair user wishes to change the angle of the chair seat, he simply reaches under the seat, grasps gripper 92 and moves adjustment slide 90 to either the left or right, depending on which way he wants to adjust the seat angle. This movement causes upwardly projecting bolts 93 to slide in slots 75 of seat support stretcher assembly 70 and in helical slots 88 and 83 of pivot bracket inserts 86 and pivot bracket 81 respectively. Because slots 88 and 83 are helical and thus skewed slightly with respect to slots 75, such movement of bolts 93 causes pivot bracket 81 to pivot about its pivot mountings 82, which in turn changes the elevation of front axle 89 with respect to the front of seat stretcher assembly 70. This, of course, results in changing the seat angle.
Of course, it is understood that the above is merely a preferred embodiment of the invention and that various changes and alterations can be made without departing from the spirit and broader aspects thereof as more par-: ticularly defined in the appended claims.
Claims
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
A chair seat pitch adjustment assembly having first support means, seat support member pivotally mounted with respect to said first support means at one point and adjustment means interconnecting said seat support with said first support for adjusting the angle of said seat support member with respect to said first support means, the improvement in said assembly comprising: said adjust-ment means including a pivot bracket pivotally mounted to said first support means on one pivot axis and to said seat support member on a second pivot axis; said pivot bracket including a cylindrical wall extending generally laterally with respect to the sides of said seat support member, said cylindrical wall defining at least a portion of the wall of a right circular cylinder whose axis of revolution lies on said second pivot axis; said cylindrical wall including at least one helically oriented slot therein;
a slide slidably mounted on said seat support member for generally lateral movement with respect to the sides of said seat support member, means for restraining said slide for generally lateral motion relative to the sides of said seat support member, said slide including projection means projecting through said helical slot in said cylindrical wall whereby as said slide is moved laterally, said cylin-drical wall and therefore said pivot bracket are rotated about said second pivot axis, thereby changing the relative elevation of said first pivot axis with respect thereto and thereby changing the pitch of said seat support means with respect to said first support means.
The adjustment assembly of claim 1 which includes means allowing at least one of said pivotal mountings between said seat support means and said first support means, said seat support means and said pivot bracket and said pivot bracket and said first support means, to shift when said pivot bracket is rotated.
The adjustment assembly of claim 2 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 3 in which said means allowing shifting comprises said first pivot axis being slidably mounted on said first support means.
The adjustment assembly of claim 4 in which said first pivot axis comprises an axle mounted in bushings; said first support means including track means receiving said bushings, said bushings being slidably received within said track means.
The adjustment assembly of claim 1, 2, or 3 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The adjustment assembly of claim 4 or 5 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The adjustment assembly of claim 1 in which said seat support member includes a wall having a generally rectilinear slot therein extending generally laterally with respect to the sides of said seat support member;
said projection means on said slide extending through said generally rectilinear slot.
The adjustment assembly of claim 2 in which said seat support member includes a wall having a generally rectilinear slot therein extending generally laterally with respect to the sides of said seat support member;
said projection means on said slide extending through said generally rectilinear slot.
The adjustment assembly of claim 3 in which said seat support member includes a wall having a generally rectilinear slot therein extending generally laterally with respect to the sides of said seat support member;
said projection means on said slide extending through said generally rectilinear slot.
The adjustment assembly of claim 8 in which said projection means includes a locating shoulder of generally rectangular lateral cross section with sides oriented generally parallel to said generally rectilinear slot, said shoulder being received in said generally rectilinear slot;
said projection means including a second shoulder of generally rectangular lateral cross section and having sides oriented at an angle with respect to said sides of said first shoulder and generally parallel to the sides of said helical slot as projected into a plane, said second shoulder being received within said helical slot.
The adjustment assembly of claim 9 in which said projection means includes a locating shoulder of generally rectangular lateral cross section with sides oriented gener-ally parallel to said generally rectilinear slot, said shoulder being received in said generally rectilinear slot;
said projection means including a second shoulder of generally rectangular lateral cross section and having sides oriented at an angle with respect to said sides of said first shoulder and generally parallel to the sides of said helical slot as projected into a plane, said second shoulder being received within said helical slot.
The adjustment assembly of claim 10 in which said projection means includes a locating shoulder of generally rectangular lateral cross section with sides oriented generally parallel to said generally rectilinear slot, said shoulder being received in said generally rectilinear slot;
said projection means including a second shoulder of generally rectangular lateral cross section and having sides oriented at an angle with respect to said sides of said first shoulder and generally parallel to the sides of said helical slot as projected into a plane, said second shoulder being received within said helical slot.
The adjustment assembly of claim 11, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 12, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 13, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 14, 15 or 16 in which said helical slot in said plastic insert includes a lip extending peripherally therearound and projecting downwardly from the generally cylindrical configuration of said insert, said lip fitting into and covering the edges of said helical slot in said cylindrical wall.
The adjustment assembly of claim 14, 15 or 16 comprising: a plastic washer of semi-cylindrical vertical cross section positioned on the end of said projecting means and being seated within said plastic insert; means securing said plastic washer on said end of said projection means.
The adjustment assembly of claim 8, 9 or 10 in which said slide comprises a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide.
The seat adjustment assembly of claim 11, 12 or 13 in which said slide is a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide; said first shoulder being integrally molded of plastic with said slide and surrounding said shoulder bolt; said second shoulder comprising the shoulder of said shoulder bolt.
The adjustment assembly of claim 8, 9 or 10 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The adjustment assembly of claim 11, 12 or 13 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The seat adjustment assembly of claim 1 in which said pivot bracket is generally U-shaped, comprising a pair of spaced sidewalls joined by said cylindrical wall, said first and second pivot axes extending through said sidewalls of said pivot bracket.
The adjustment assembly of claim 23 in which there are two of said helical slots in said cylindrical wall, said slots being spaced laterally from one another with respect to said sidewalls and being oriented generally parallel to one another; there being two of said projection means on said slide, one projecting through each of said helical slots.
The adjustment assembly of claim 1 in which said slide comprises a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide.
The adjustment assembly of claim 1, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 26 in which said helical slot in said plastic insert includes a lip extending peripherally therearound and projecting downwardly from the generally cylindrical configuration of said insert, said lip fitting into and covering the edges of said helical slot in said cylindrical wall.
A chair seat pitch adjustment assembly having first support means, a seat support member pivotally mounted with respect to said first support means at one point and adjustment means interconnecting said seat support with said first support means for adjusting the angle of said seat support member with respect to said first support means, the improvement in said assembly comprising: said adjustment means including a pivot bracket pivotally mounted to said first support means on one pivot axis and to said seat support member on a second pivot axis; said pivot bracket including a cylindrical wall extending generally laterally with respect to the sides of said seat support member, said cylindrical wall defining at least a portion of the wall of a right circular cylinder whose axis of revolution lies on said second pivot axis; said cylindrical wall including at least one helically oriented slot therein; a slide slidably mounted on said seat support member for generally lateral movement with respect to the sides of said seat support member, said slide including projection means projecting through said helical slot in said cylindrical wall whereby as said slide is moved laterally, said cylindrical wall and therefore said pivot bracket are rotated about said second pivot axis, thereby changing the relative elevation of said first pivot axis with respect thereto and thereby changing the pitch of said seat support means with respect to said first support means; means allowing at least one of said pivotal mountings between said seat support means and said first support means, said seat support means and said pivot bracket and said pivot bracket and said first support means to shift when said pivot bracket is rotated;
said seat support member including a wall having a generally rectilinear slot therein extending generally laterally with respect to the sides of said seat support member; said projection means on said slide extending through said generally rectilinear slot; and a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 28 in which said projection means includes a locating shoulder of generally rectangular lateral cross section with sides oriented generally parallel to said generally rectilinear slot, said shoulder being received in said generally rectilinear slot; said projection means including a second shoulder of generally rectangular lateral cross section and having sides oriented at an angle with respect to said sides of said first shoulder and generally parallel to the sides of said helical slot as projected into a plane, said second shoulder being received within said helical slot.
The adjustment assembly of claim 29 in which said slide comprises a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide.
The seat adjustment assembly of claim 29 in which said slide is a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide; said first shoulder being integrally molded of plastic with said slide and surrounding said shoulder bolt; said second shoulder comprising the shoulder of said shoulder bolt.
The seat adjustment assembly of claim 28 in which said pivot bracket is generally U-shaped, comprising a pair of spaced sidewalls joined by said cylindrical wall, said first and second pivot axes extending through said sidewalls of said pivot bracket.
The adjustment assembly of claim 32 in which there are two of said helical slots in said cylindrical wall, said slots being spaced laterally from one another with respect to said sidewalls and being oriented generally parallel to one another; there being two of said projection means on said slide, one projecting through each of said helical slots.
The adjustment assembly of claim 28, 29 or 30 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The adjustment assembly of claim 31, 32 or 33 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The adjustment assembly of claim 28 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 29 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 30 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 31 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 32 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 33 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 36, 37 or 38 in which said first pivot axis comprises an axle mounted in bushings; said first support means including a track means receiving said bushings, said bushings being slidably received within said track means.
The adjustment assembly of claim 39, 40 or 41 in which said first pivot axis comprises an axle mounted in bushings; said first support means including a track means receiving said bushings, said bushings being slidably received within said track means.
A chair seat pitch adjustment assembly having first support means, a seat support member pivotally mounted with respect to said first support means at one point and adjustment means interconnecting said seat support with said first support for adjusting the angle of said seat support member with respect to said first support means, the improvement in said assembly comprising: said adjustment means including a bracket having a semi-cylindrical wall, said bracket being pivotally joined to said first support means; said semi-cylindrical wall including a helical slot therein; slide means slidably mounted on said seat support means and including projection means projecting through said helical slot, means for restraining said slide for generally lateral motion relative to the sides of said seat support member.
The adjustment assembly of claim 44 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The adjustment assembly of claim 44 in which said seat support member includes a wall having a generally rectilinear slot therein extending generally laterally with respect to the sides of said seat support member; said projecting means on said slide extending through said generally rectilinear slot.
The adjustment assembly of claim 45 in which said seat support member includes a wall having a generally rectilinear slot therein extending generally laterally with respect to the sides of said seat support member; said projecting means on said slide extending through said generally rectilinear slot.
The adjustment assembly of claim 46 in which said projection means includes a locating shoulder of generally rectangular lateral cross section with sides oriented generally parallel to said generally rectilinear slot, said shoulder being received in said generally rectilinear slot;
said projection means including a second shoulder of generally rectangular lateral cross section and having sides oriented at an angle with respect to said sides of said first shoulder and generally parallel to the sides of said helical slot as projected into a plane, said second shoulder being received within said helical slot.
The adjustment assembly of claim 47 in which said projection means includes a locating shoulder of generally rectangular lateral cross section with sides oriented generally parallel to said generally rectilinear slot, said shoulder being received in said generally rectilinear slot;
said projection means including a second shoulder of generally rectangular lateral cross section and having sides oriented at an angle with respect to said sides of said first shoulder and generally parallel to the sides of said helical slot as projected into a plane, said second shoulder being received within said helical slot.
The adjustment assembly of claim 48, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 49, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 50 in which said helical slot in said plastic insert includes a lip extending peripherally therearound and projecting downwardly from the generally cylindrical configuration of said insert, said lip fitting into and covering the edges of said helical slot in said cylindrical wall.
The adjustment assembly of claim 51 in which said helical slot in said plastic insert includes a lip extending peripherally therearound and projecting downardly from the generally cylindrical configuration of said insert, said lip fitting into and covering the edges of said helical slot in said cylindrical wall.
The adjustment assembly of claim 52 or 53 comprising:
a plastic washer of semi-cylindrical vertical cross section positioned on the end of said projection means and being seated within said plastic insert; means securing said plastic washer on said end of said projection means.
The adjustment assembly of claim 44 or 45 in which said slide comprises a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide.
The seat adjustment assembly of claim 48 or 49 in which said slide is a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide; said first shoulder being integrally molded of plastic with said slide and surrounding said shoulder bolt; said second shoulder comprising the shoulder of said shoulder bolt.
The adjustment assembly of claim 44 in which said slide comprises a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide.
The adjustment assembly of claim 44, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
A chair seat pitch adjustment assembly having first support means, seat support member pivotally mounted with respect to said first support means at one point and adjustment means interconnecting said seat support with said first support for adjusting the angle of said seat support member with respect to said first support means, the improvement in said assembly comprising: said adjust-ment means including a pivot bracket pivotally mounted to said first support means on one pivot axis and to said seat support member on a second pivot axis; said pivot bracket including a cylindrical wall extending generally laterally with respect to the sides of said seat support member, said cylindrical wall defining at least a portion of the wall of a right circular cylinder whose axis of revolution lies on said second pivot axis; said cylindrical wall including at least one helically oriented slot therein;
a slide slidably mounted on said seat support member for generally lateral movement with respect to the sides of said seat support member, means for restraining said slide for generally lateral motion relative to the sides of said seat support member, said slide including projection means projecting through said helical slot in said cylindrical wall whereby as said slide is moved laterally, said cylin-drical wall and therefore said pivot bracket are rotated about said second pivot axis, thereby changing the relative elevation of said first pivot axis with respect thereto and thereby changing the pitch of said seat support means with respect to said first support means.
The adjustment assembly of claim 1 which includes means allowing at least one of said pivotal mountings between said seat support means and said first support means, said seat support means and said pivot bracket and said pivot bracket and said first support means, to shift when said pivot bracket is rotated.
The adjustment assembly of claim 2 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 3 in which said means allowing shifting comprises said first pivot axis being slidably mounted on said first support means.
The adjustment assembly of claim 4 in which said first pivot axis comprises an axle mounted in bushings; said first support means including track means receiving said bushings, said bushings being slidably received within said track means.
The adjustment assembly of claim 1, 2, or 3 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The adjustment assembly of claim 4 or 5 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The adjustment assembly of claim 1 in which said seat support member includes a wall having a generally rectilinear slot therein extending generally laterally with respect to the sides of said seat support member;
said projection means on said slide extending through said generally rectilinear slot.
The adjustment assembly of claim 2 in which said seat support member includes a wall having a generally rectilinear slot therein extending generally laterally with respect to the sides of said seat support member;
said projection means on said slide extending through said generally rectilinear slot.
The adjustment assembly of claim 3 in which said seat support member includes a wall having a generally rectilinear slot therein extending generally laterally with respect to the sides of said seat support member;
said projection means on said slide extending through said generally rectilinear slot.
The adjustment assembly of claim 8 in which said projection means includes a locating shoulder of generally rectangular lateral cross section with sides oriented generally parallel to said generally rectilinear slot, said shoulder being received in said generally rectilinear slot;
said projection means including a second shoulder of generally rectangular lateral cross section and having sides oriented at an angle with respect to said sides of said first shoulder and generally parallel to the sides of said helical slot as projected into a plane, said second shoulder being received within said helical slot.
The adjustment assembly of claim 9 in which said projection means includes a locating shoulder of generally rectangular lateral cross section with sides oriented gener-ally parallel to said generally rectilinear slot, said shoulder being received in said generally rectilinear slot;
said projection means including a second shoulder of generally rectangular lateral cross section and having sides oriented at an angle with respect to said sides of said first shoulder and generally parallel to the sides of said helical slot as projected into a plane, said second shoulder being received within said helical slot.
The adjustment assembly of claim 10 in which said projection means includes a locating shoulder of generally rectangular lateral cross section with sides oriented generally parallel to said generally rectilinear slot, said shoulder being received in said generally rectilinear slot;
said projection means including a second shoulder of generally rectangular lateral cross section and having sides oriented at an angle with respect to said sides of said first shoulder and generally parallel to the sides of said helical slot as projected into a plane, said second shoulder being received within said helical slot.
The adjustment assembly of claim 11, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 12, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 13, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 14, 15 or 16 in which said helical slot in said plastic insert includes a lip extending peripherally therearound and projecting downwardly from the generally cylindrical configuration of said insert, said lip fitting into and covering the edges of said helical slot in said cylindrical wall.
The adjustment assembly of claim 14, 15 or 16 comprising: a plastic washer of semi-cylindrical vertical cross section positioned on the end of said projecting means and being seated within said plastic insert; means securing said plastic washer on said end of said projection means.
The adjustment assembly of claim 8, 9 or 10 in which said slide comprises a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide.
The seat adjustment assembly of claim 11, 12 or 13 in which said slide is a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide; said first shoulder being integrally molded of plastic with said slide and surrounding said shoulder bolt; said second shoulder comprising the shoulder of said shoulder bolt.
The adjustment assembly of claim 8, 9 or 10 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The adjustment assembly of claim 11, 12 or 13 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The seat adjustment assembly of claim 1 in which said pivot bracket is generally U-shaped, comprising a pair of spaced sidewalls joined by said cylindrical wall, said first and second pivot axes extending through said sidewalls of said pivot bracket.
The adjustment assembly of claim 23 in which there are two of said helical slots in said cylindrical wall, said slots being spaced laterally from one another with respect to said sidewalls and being oriented generally parallel to one another; there being two of said projection means on said slide, one projecting through each of said helical slots.
The adjustment assembly of claim 1 in which said slide comprises a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide.
The adjustment assembly of claim 1, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 26 in which said helical slot in said plastic insert includes a lip extending peripherally therearound and projecting downwardly from the generally cylindrical configuration of said insert, said lip fitting into and covering the edges of said helical slot in said cylindrical wall.
A chair seat pitch adjustment assembly having first support means, a seat support member pivotally mounted with respect to said first support means at one point and adjustment means interconnecting said seat support with said first support means for adjusting the angle of said seat support member with respect to said first support means, the improvement in said assembly comprising: said adjustment means including a pivot bracket pivotally mounted to said first support means on one pivot axis and to said seat support member on a second pivot axis; said pivot bracket including a cylindrical wall extending generally laterally with respect to the sides of said seat support member, said cylindrical wall defining at least a portion of the wall of a right circular cylinder whose axis of revolution lies on said second pivot axis; said cylindrical wall including at least one helically oriented slot therein; a slide slidably mounted on said seat support member for generally lateral movement with respect to the sides of said seat support member, said slide including projection means projecting through said helical slot in said cylindrical wall whereby as said slide is moved laterally, said cylindrical wall and therefore said pivot bracket are rotated about said second pivot axis, thereby changing the relative elevation of said first pivot axis with respect thereto and thereby changing the pitch of said seat support means with respect to said first support means; means allowing at least one of said pivotal mountings between said seat support means and said first support means, said seat support means and said pivot bracket and said pivot bracket and said first support means to shift when said pivot bracket is rotated;
said seat support member including a wall having a generally rectilinear slot therein extending generally laterally with respect to the sides of said seat support member; said projection means on said slide extending through said generally rectilinear slot; and a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 28 in which said projection means includes a locating shoulder of generally rectangular lateral cross section with sides oriented generally parallel to said generally rectilinear slot, said shoulder being received in said generally rectilinear slot; said projection means including a second shoulder of generally rectangular lateral cross section and having sides oriented at an angle with respect to said sides of said first shoulder and generally parallel to the sides of said helical slot as projected into a plane, said second shoulder being received within said helical slot.
The adjustment assembly of claim 29 in which said slide comprises a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide.
The seat adjustment assembly of claim 29 in which said slide is a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide; said first shoulder being integrally molded of plastic with said slide and surrounding said shoulder bolt; said second shoulder comprising the shoulder of said shoulder bolt.
The seat adjustment assembly of claim 28 in which said pivot bracket is generally U-shaped, comprising a pair of spaced sidewalls joined by said cylindrical wall, said first and second pivot axes extending through said sidewalls of said pivot bracket.
The adjustment assembly of claim 32 in which there are two of said helical slots in said cylindrical wall, said slots being spaced laterally from one another with respect to said sidewalls and being oriented generally parallel to one another; there being two of said projection means on said slide, one projecting through each of said helical slots.
The adjustment assembly of claim 28, 29 or 30 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The adjustment assembly of claim 31, 32 or 33 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The adjustment assembly of claim 28 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 29 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 30 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 31 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 32 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 33 in which said means allowing shifting comprises means allowing said first pivot axis to shift.
The adjustment assembly of claim 36, 37 or 38 in which said first pivot axis comprises an axle mounted in bushings; said first support means including a track means receiving said bushings, said bushings being slidably received within said track means.
The adjustment assembly of claim 39, 40 or 41 in which said first pivot axis comprises an axle mounted in bushings; said first support means including a track means receiving said bushings, said bushings being slidably received within said track means.
A chair seat pitch adjustment assembly having first support means, a seat support member pivotally mounted with respect to said first support means at one point and adjustment means interconnecting said seat support with said first support for adjusting the angle of said seat support member with respect to said first support means, the improvement in said assembly comprising: said adjustment means including a bracket having a semi-cylindrical wall, said bracket being pivotally joined to said first support means; said semi-cylindrical wall including a helical slot therein; slide means slidably mounted on said seat support means and including projection means projecting through said helical slot, means for restraining said slide for generally lateral motion relative to the sides of said seat support member.
The adjustment assembly of claim 44 in which said slide includes a gripping flange projecting downwardly therefrom whereby a user can readily grasp said gripping flange and slide said slide one way or another.
The adjustment assembly of claim 44 in which said seat support member includes a wall having a generally rectilinear slot therein extending generally laterally with respect to the sides of said seat support member; said projecting means on said slide extending through said generally rectilinear slot.
The adjustment assembly of claim 45 in which said seat support member includes a wall having a generally rectilinear slot therein extending generally laterally with respect to the sides of said seat support member; said projecting means on said slide extending through said generally rectilinear slot.
The adjustment assembly of claim 46 in which said projection means includes a locating shoulder of generally rectangular lateral cross section with sides oriented generally parallel to said generally rectilinear slot, said shoulder being received in said generally rectilinear slot;
said projection means including a second shoulder of generally rectangular lateral cross section and having sides oriented at an angle with respect to said sides of said first shoulder and generally parallel to the sides of said helical slot as projected into a plane, said second shoulder being received within said helical slot.
The adjustment assembly of claim 47 in which said projection means includes a locating shoulder of generally rectangular lateral cross section with sides oriented generally parallel to said generally rectilinear slot, said shoulder being received in said generally rectilinear slot;
said projection means including a second shoulder of generally rectangular lateral cross section and having sides oriented at an angle with respect to said sides of said first shoulder and generally parallel to the sides of said helical slot as projected into a plane, said second shoulder being received within said helical slot.
The adjustment assembly of claim 48, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 49, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
The adjustment assembly of claim 50 in which said helical slot in said plastic insert includes a lip extending peripherally therearound and projecting downwardly from the generally cylindrical configuration of said insert, said lip fitting into and covering the edges of said helical slot in said cylindrical wall.
The adjustment assembly of claim 51 in which said helical slot in said plastic insert includes a lip extending peripherally therearound and projecting downardly from the generally cylindrical configuration of said insert, said lip fitting into and covering the edges of said helical slot in said cylindrical wall.
The adjustment assembly of claim 52 or 53 comprising:
a plastic washer of semi-cylindrical vertical cross section positioned on the end of said projection means and being seated within said plastic insert; means securing said plastic washer on said end of said projection means.
The adjustment assembly of claim 44 or 45 in which said slide comprises a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide.
The seat adjustment assembly of claim 48 or 49 in which said slide is a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide; said first shoulder being integrally molded of plastic with said slide and surrounding said shoulder bolt; said second shoulder comprising the shoulder of said shoulder bolt.
The adjustment assembly of claim 44 in which said slide comprises a molded plastic member and said projection means comprises a shoulder bolt having a head embedded in said plastic slide.
The adjustment assembly of claim 44, comprising:
a molded plastic insert of semi-cylindrical configuration corresponding to the configuration of said cylindrical wall and being seated therein, said insert including a helical slot therein aligned with said helical slot in said cylindrical wall.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/145,624 US4375301A (en) | 1980-05-01 | 1980-05-01 | Chair seat adjustment assembly |
| US145,624 | 1980-05-01 | ||
| US06/145,439 US4314728A (en) | 1980-05-01 | 1980-05-01 | Chair control |
| US06/145,854 US4390206A (en) | 1980-05-01 | 1980-05-01 | Synchrotilt chair control |
| US06/145,622 US4438898A (en) | 1980-05-01 | 1980-05-01 | Chain control locking assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1162833A true CA1162833A (en) | 1984-02-28 |
Family
ID=42246360
Family Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000375862A Expired CA1162833A (en) | 1980-05-01 | 1981-04-21 | Chair seat adjustment assembly |
| CA000375846A Expired CA1162832A (en) | 1980-05-01 | 1981-04-21 | Chair control |
| CA000375774A Expired CA1156922A (en) | 1980-05-01 | 1981-04-21 | Chair control locking assembly |
| CA000376139A Expired CA1157366A (en) | 1980-05-01 | 1981-04-24 | Synchrotilt chair control |
Family Applications After (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000375846A Expired CA1162832A (en) | 1980-05-01 | 1981-04-21 | Chair control |
| CA000375774A Expired CA1156922A (en) | 1980-05-01 | 1981-04-21 | Chair control locking assembly |
| CA000376139A Expired CA1157366A (en) | 1980-05-01 | 1981-04-24 | Synchrotilt chair control |
Country Status (5)
| Country | Link |
|---|---|
| US (4) | US4314728A (en) |
| EP (2) | EP0039574B1 (en) |
| CA (4) | CA1162833A (en) |
| DE (2) | DE3172578D1 (en) |
| ES (2) | ES501793A0 (en) |
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-
1980
- 1980-05-01 US US06/145,439 patent/US4314728A/en not_active Expired - Lifetime
- 1980-05-01 US US06/145,624 patent/US4375301A/en not_active Expired - Lifetime
- 1980-05-01 US US06/145,622 patent/US4438898A/en not_active Expired - Lifetime
- 1980-05-01 US US06/145,854 patent/US4390206A/en not_active Expired - Lifetime
-
1981
- 1981-04-21 CA CA000375862A patent/CA1162833A/en not_active Expired
- 1981-04-21 CA CA000375846A patent/CA1162832A/en not_active Expired
- 1981-04-21 CA CA000375774A patent/CA1156922A/en not_active Expired
- 1981-04-24 CA CA000376139A patent/CA1157366A/en not_active Expired
- 1981-04-29 EP EP19810301890 patent/EP0039574B1/en not_active Expired
- 1981-04-29 DE DE8181301892T patent/DE3172578D1/en not_active Expired
- 1981-04-29 DE DE8181301890T patent/DE3172808D1/en not_active Expired
- 1981-04-29 EP EP19810301892 patent/EP0039576B1/en not_active Expired
- 1981-04-30 ES ES501793A patent/ES501793A0/en active Granted
- 1981-04-30 ES ES501794A patent/ES501794A0/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| EP0039574A2 (en) | 1981-11-11 |
| EP0039574A3 (en) | 1982-06-23 |
| EP0039576A2 (en) | 1981-11-11 |
| US4375301A (en) | 1983-03-01 |
| CA1162832A (en) | 1984-02-28 |
| EP0039576A3 (en) | 1982-06-16 |
| ES8207420A1 (en) | 1982-09-16 |
| US4390206A (en) | 1983-06-28 |
| EP0039574B1 (en) | 1985-11-06 |
| ES8205548A1 (en) | 1982-06-16 |
| EP0039576B1 (en) | 1985-10-09 |
| US4314728A (en) | 1982-02-09 |
| US4438898A (en) | 1984-03-27 |
| ES501794A0 (en) | 1982-09-16 |
| DE3172578D1 (en) | 1985-11-14 |
| ES501793A0 (en) | 1982-06-16 |
| CA1156922A (en) | 1983-11-15 |
| DE3172808D1 (en) | 1985-12-12 |
| CA1157366A (en) | 1983-11-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |