CA1156922A - Chair control locking assembly - Google Patents
Chair control locking assemblyInfo
- Publication number
- CA1156922A CA1156922A CA000375774A CA375774A CA1156922A CA 1156922 A CA1156922 A CA 1156922A CA 000375774 A CA000375774 A CA 000375774A CA 375774 A CA375774 A CA 375774A CA 1156922 A CA1156922 A CA 1156922A
- Authority
- CA
- Canada
- Prior art keywords
- rigid member
- chair control
- leg
- stationary
- chair
- 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
-
- 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
Landscapes
- Health & Medical Sciences (AREA)
- Dentistry (AREA)
- General Health & Medical Sciences (AREA)
- Chairs Characterized By Structure (AREA)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
- Chair Legs, Seat Parts, And Backrests (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The specification discloses a chair control in which the tiltable member can be locked against movement with respect to the stationary member by means of a rigid locking plate pivotally mounted on the tilting member and rotatable by an actuator rod, having a bell crank type lever formed therein, into close proximity with the station-ary member to thereby physically block relative movement between the tiltable and stationary members.
The specification discloses a chair control in which the tiltable member can be locked against movement with respect to the stationary member by means of a rigid locking plate pivotally mounted on the tilting member and rotatable by an actuator rod, having a bell crank type lever formed therein, into close proximity with the station-ary member to thereby physically block relative movement between the tiltable and stationary members.
Description
~ ;p~'2~
C~IAIR CONTROL LOCICI~G ASSEMBLY
l BACKGROUND O~ THE INV~NTION
The present invention relates to chair controls.
Cllair controls are devices mounted underneath the seat of the chair typically to control the tilting o~ the chair when a person leans back in it. They usually comprise a sta~ion-ary member adapted to be mounted on a pedestal base and a tiltable member or members pivotally mounted to the station-ary member. The tiltable member is then secured to the chair seat or back. There is a bias memberor energy storing de-vice which controls the rate a~ which one can tilt rear-wardly in ~he chair with the application o~ a given force and which returns the chair to its normal position when the user stops leaning back. Many users of tilter chairs consider it desirable to be able to lock the chair against tilting. While it is nice to be able to lean back in a chair and think or re-~lect about a particular project, there are also 'rdoing" tasks where it is nice to sit up to your desk and still receive some support ~rom your chair when you lean back in it. To perform such "doing" tasks, some users like to be able to lock their chair control against tilting motlon.
Such locking devices have been proposed in prior art chair controls. United States Patent 2,9~1,125 discloses some type o~ chair control in -which a small cylinder is mount0d between the base and back o~ the chair, which cylinder can be locked against movement to thereby lock the ch~ir against tilting action. United States Patent 3,6Q2,537 to Kerstholt and United States Patent 4,062,587 to Wolters disclose another type o locking mechanism wherein members which are normally movable with respect to one another can be clamped tightly against one another to prevent movement.
1 These mechanisms are complex in construction.
Purther~ parts which are normally movable with respect to each other are placed under a good deal of stress by being clamped against one another. The mechanisms doing the clamp-ing and locking action are accordingly subject to wear and tear.
_ MMARY OF THE INVENTION
The chair control of the present invention includes a locking means of a relatively simple and inexpensive construction which also avoids the need for clamping devices or expensive cylinders. In the chair control of the present invention, the locking means comprises a rigid member movably mounted on the chair control and operably connected to ; actuator means capable of moving the rigid member between a 1~ locking position and an unlocking position. The rigid member has such a configuration and orientation in its mounting to the chair control such that when in its locking position, it extends from a position of operable engagement with the tilt-ing member to a position of operable engagement with the stationary member thereby preventing relative movement between the two. When in its unlocking position, it is out of operable engagement with at least one of the stationary or tiltable members whereby the tiltable member can tilt with respect to the stationary member.
These and other objects~ advantages and ~eatures of the invention will be more fully understood and appreciative by reference to the written speciElcation and appencled drawings.
BRIEF D~SCRIPTION OF T DRAWI~GS
~igure 1 is a plan view of a chair control made in accordance with the present invention;
C~IAIR CONTROL LOCICI~G ASSEMBLY
l BACKGROUND O~ THE INV~NTION
The present invention relates to chair controls.
Cllair controls are devices mounted underneath the seat of the chair typically to control the tilting o~ the chair when a person leans back in it. They usually comprise a sta~ion-ary member adapted to be mounted on a pedestal base and a tiltable member or members pivotally mounted to the station-ary member. The tiltable member is then secured to the chair seat or back. There is a bias memberor energy storing de-vice which controls the rate a~ which one can tilt rear-wardly in ~he chair with the application o~ a given force and which returns the chair to its normal position when the user stops leaning back. Many users of tilter chairs consider it desirable to be able to lock the chair against tilting. While it is nice to be able to lean back in a chair and think or re-~lect about a particular project, there are also 'rdoing" tasks where it is nice to sit up to your desk and still receive some support ~rom your chair when you lean back in it. To perform such "doing" tasks, some users like to be able to lock their chair control against tilting motlon.
Such locking devices have been proposed in prior art chair controls. United States Patent 2,9~1,125 discloses some type o~ chair control in -which a small cylinder is mount0d between the base and back o~ the chair, which cylinder can be locked against movement to thereby lock the ch~ir against tilting action. United States Patent 3,6Q2,537 to Kerstholt and United States Patent 4,062,587 to Wolters disclose another type o locking mechanism wherein members which are normally movable with respect to one another can be clamped tightly against one another to prevent movement.
1 These mechanisms are complex in construction.
Purther~ parts which are normally movable with respect to each other are placed under a good deal of stress by being clamped against one another. The mechanisms doing the clamp-ing and locking action are accordingly subject to wear and tear.
_ MMARY OF THE INVENTION
The chair control of the present invention includes a locking means of a relatively simple and inexpensive construction which also avoids the need for clamping devices or expensive cylinders. In the chair control of the present invention, the locking means comprises a rigid member movably mounted on the chair control and operably connected to ; actuator means capable of moving the rigid member between a 1~ locking position and an unlocking position. The rigid member has such a configuration and orientation in its mounting to the chair control such that when in its locking position, it extends from a position of operable engagement with the tilt-ing member to a position of operable engagement with the stationary member thereby preventing relative movement between the two. When in its unlocking position, it is out of operable engagement with at least one of the stationary or tiltable members whereby the tiltable member can tilt with respect to the stationary member.
These and other objects~ advantages and ~eatures of the invention will be more fully understood and appreciative by reference to the written speciElcation and appencled drawings.
BRIEF D~SCRIPTION OF T DRAWI~GS
~igure 1 is a plan view of a chair control made in accordance with the present invention;
-2--FicJure 2 is a Eragmentary cross-sectional view taken generally along planes II-II of FicJure 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;
Fi~ure 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 at-tached;
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 as shown in Figure l;
Figure 6 is a side elevational view of the assembly .
of F~gure 5;
Figure 7 is a front elevational view of the back upright lock plate as shown in Figure l;
Figure 8 is a cross-sectional view thereof taken generally along plane VIII-VIII of Figure 7, and including a pivot axle;
Figure 9 is a s.ide elevational view of the back plate spring as shown in Figure l; and Figure 10 is an end elevational view of the spring o~ Figure ~.
~ESCRIP~IVN O~ THE PREFERRED EMBODIMENT
Chair contxol 1 comprises a stationAry control housing 10 which houses a bias means 30 (Figs. 1 an~ 4). The de-gree o~ pretension on bias means 30 is controlled by tension bolt assembly 4Q. Chair back support arms 60 are secured to
Fi~ure 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 at-tached;
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 as shown in Figure l;
Figure 6 is a side elevational view of the assembly .
of F~gure 5;
Figure 7 is a front elevational view of the back upright lock plate as shown in Figure l;
Figure 8 is a cross-sectional view thereof taken generally along plane VIII-VIII of Figure 7, and including a pivot axle;
Figure 9 is a s.ide elevational view of the back plate spring as shown in Figure l; and Figure 10 is an end elevational view of the spring o~ Figure ~.
~ESCRIP~IVN O~ THE PREFERRED EMBODIMENT
Chair contxol 1 comprises a stationAry control housing 10 which houses a bias means 30 (Figs. 1 an~ 4). The de-gree o~ pretension on bias means 30 is controlled by tension bolt assembly 4Q. Chair back support arms 60 are secured to
3~ r ,~
1 the ends of the arbor 31 of bias means 30 and pivot with respect to stationary control housing lQ. Chair seat support stretcher assembly 70 is pivotally mounted at its rear directly to back swpport 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 could be direct, but in the embodiment shown is through a seat adjus*ment assembly 80 which does not comprisepart of this invention per se and hence is not described in detail below.
Tiltable back support arms 60 and seat support 70 can be locked against tilting movement by chair control locking plate 140. Rigid locking plate 140 pivotally ~ mounted on back support arms 60 can be rotated by actuator - rod 150 into operable engagement with the rear of stationary housing 10, thereby blocking tilting movement.
Chair control 1 as shown is a synchrotilt control, ha~ing a seat tilt member and back tilt member which both tilt, but at different rates. The present invention would also be operable in other types o controls where only one tiltable member is provided. Also, other desirable features are shown in the drawings and may be briefly referred to herein, but they are not described in detail since they do not pertain per se to the locking assembly 140.
Stationary control housing 10 is a stamped or other-wise ~ormed metal dish ha~ing 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 o:E spindle Z extends. A spindle mounting plate 16 is welded to the in-side of housing 10 and includes an aperture 17 therein to also l receive ~he upper end of spindle assembly 2 (Figs. 1 and 2).
Bias means 30 comprises a torsional coil spring arrangement. An arbor 31 W]liC}l iS generally circular in cross sectional con:figuration extends through holes 17 in side walls 12 of stationary control housing 10 ~compare to 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 adjust-ment is achieved by tightening or loosening tension bolt 40 in retainer nut S9. Basically, tension adjustment bolt assembly ~0 comprises a bolt 40a having a hollow shank normally housing a lever ~7. One can grasp gripping cap 51, retract lever ~7, pivot it to one side into a slot ~3a and rotate it to thread bolt ~Oa up or down in retainer 59.
Chair back support arms 60 are formed of metal and are pre~erably channel shaped in cross section having a top wall 63, a side wall 6~ and a bottom wall 65 (Fig. 2). There are ~wo 5uch chair back mounting arms 60, one located on either side of statllonary housing 10 (Fig. 1). The generally channel shape cross section allows one to sl:ip a chair back support frame or arm into the channels.
The arbor mounting hole or holes 61 in the side wall 6~ o-f chair back support arm 60 is visible through the hole 17 in the side of stationary housing 10 in Figura 2.
1 'I'here are ~wo semi-circles 61 spaced by a br:idge 62. The ends of arbor 30 are slotted so that they f:Lt 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 p:ivot and arbor 30 rotates within its plastic end bearings 35.
On top wall 63 o-f 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 the 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 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. There is an aperture 78a in the same side stretcher and a similar aperture 78 in the other side stretcher 70a through which the chair control lock actuator rod 150 extends.
Located towards ~he rear oE each slde wall 72 o:~
each stretcher 70a is a rear axle receiving hole 79 ~Pig. 6) which receives the end of rear axle 68 carried in a suitable plastic bearing of ~ r~ shaped longitudinal cross section 79a(~ig.
2~
1 1). 0~ course, suitable retainer clips 79b or the like then hold rear axle 68 in position (hidden in Fig. 1).
The purpose of locking plate 140 is to lock the chair back in its upright condition, making it impossible for S a person to tilt the chair and chair control 1 rearwardly.
Referring to Figures 1, 4, 7 and 8, it will be seen that locking pla~e 140 comprises a rigid metal plate which has been formed to define a pair of spaced side walls 142 and a middle leg 143, all projecting in the same direction from and joined by a back wall 141. Each side wall 142 includes a key-hole opening 144 therein, Middle leg 143 simply includes a round hole 145 therein. Locking plate 140 is plvotally mounted to chair control assembly 1 by means of rear axle 68 ex-tending through keyholes 144 and hole 145, all of which are in alignment with one another. As can be seen by reerence to Figure 1, each axle bearing sleeve 68a extends inwardly sufficiently far that a portion thereof extends through each of the end openings l44 in side walls 142. As can be seen by reference to Figure 8, each bearing sleeve 68a also includes Z0 a small projecting spline 68b which extendc~ into the slot portion of keyhole 144. Spline 68b is narrower than the width of the slot portion of keyhole 144 so thatl-~ckplate 140 can be rotated about bearing 68a, yet spline 68b serves as a stop to prevent rotation beyond certain limits. Preerably~
spline 68b is integrally molded of plastic with bearing sleeve 68a so that spline 68b makes relatively little noise when contacting the sides o~ keyhole 144. This prevents plate 140 ~rom clanking noisely against lip 15 on housing 10.
Bearing sleeve 68a will not itself rotate relative to chair back support arms 60 in that it includes other splines 68c received within similar notches in the apertures 66 in arms ~. ' ~::
~5~
60 (see Figs. 1 and 2).
Referring to Figure 4, it can thus be seen that 7a-1 when locking plate 1~0 is rotated counterclockwise as viewed in Figure ~ the bottom o-f its side walls 1~2 will come into position above the lip 15 along the rear edge of stationary housing 10. Side walls 1~2 are dimensioned such that when in that position, one cannot tilt back support arms 60 downwardly since the bottom edge of side walls 142 immediately comes into abutment with lip 15, or preferably into abutmen-t with some sort of sound deadening plastic bumper, not shown in Figure 4. When in this locking position, plate 140 is in operable engagement with stationary housing 10 in and with tilting back supports 60 in that it blocks any significant relative tilting of the two. As thus intended, the term operable engagement still allows for a slight space between plate 140 and housing 10 when the control is "at rest".
In order to facilitate rotation of lock plate 140 from its unlocked condition as shown in Figure 4 to its locked condition as described above, a lock actuator rod 150 is provided which extends through a hole 78 in one side stretcher 70a ~compareFigs. 1 and 2) and is rotatably received in a similar hole 78a in the opposite side stretcher 70a (see also Fig. 5 where holes 78 and 78a are shown hidden). It will be noted that seat support 70 is located above back support 60 in elevation, in part so that lock actuator rod 150 will extend out over one back swpport 60 without inter-~ering with it ~igs. 2-~. Indeed, l~aclc support arm 60 deviates downwardly after lt goes over pivot axel 68 and then slopes back up-wardly towards the Eront o~ control 1 so as to create a de-pression in the vicinity of lock actuator 150, thereby, in-suring an absence o~ intererence even when control 1 is tllted.
Lock actuator rod 150 includes a generally U-shaped q~
1 devia~ion or lever or bell crank portion 151 in its central part. The base of lever or bell crank portion 15l is located within a notch 146 cut in che end oE rniddle leg 143 of lock plate 140 (Fig. g). Mounted Oll the end of lock rod lS0 is S an enlarged handle 15~. By depressing handle 152 towards either side of its axis of pivoting, one rotates rod 150 and thereby moves bell crank 151 upwardly or downwardly. This in turn rotates lock plate 140 about rear axle 68 and facili-tates movement of lock plate 140 from its locked to unlocked condition or visa-versa.
Spring 160 (Figs. 1, 9 and 10) biases lock plate 140 and lock actuator rod 150 to either the unlocked position or locked position through an over center action. This pre-vents lock plate 140 from being inadvertently moved one way or the other. Referring particularly to Figu~es 9 and 10, it will be seen that spring 160 comprises a pair of open looped ends 161 which are located in side by side, spaced relationship.
Each then is bent into a rearwardly extending leg 163 which in turn terminates in an upwardly bent upwardly e~tending rear leg 163. Legs 163 are joined at their ends by a short bight 164. When viewed from the encl (Fig. 10), spring 160 has a generally U-shaped configuration at one end, with legs 163 defining the sides of the "U". In assembly, spring 160 fits over leg 143 of back plate 1~0 such that bigilt 164 Eits into ~S a small notch 147 cut into the top o leg 143 ~Pig. 8~. The looped ends 161 then Eit over and are pre~erably closed around the base o~ bell crank 151 oE lock rod 150. Spring 160 then tends to hold lock plate 140 in either its locked or unlocked condition, depending on the position oE bell crank 151.
g ~ith the var:ious assemblies, sub assemblies and components thus described, the operation of chair control 1 can be more fully appreciated. As a person leans back in a chair to which chair control 1 is assembled, the chair back support arms 60 begin to pivot about their pivotal mounting (on arbor 31) to stationary housin~ 10. At the same time the rear of seat suppor~ stretcher assembly 70 begins to shi~t downwardly relative to its -front since chair ; 10 seat support stretcher assembly 70 is pivotally joined to back support arms 60 by rear axle 68. The front of seat support assembly 70 pivots about front axle 89 which, along with its bushings 99, slides rearwardly in tracks 20. Figures 2 and 3 illustrate chair control 1 in its untilted and fully tilted conditions respectively. The various pivot points are located such that the chair back tilts rearwardly at a rate ; which is approximately twice as fast as the rate of tilt for the seat.
If one wishes to lock the chair against any tilting motion, one simply reaches under the side of the chair seat and pushes upwardly against the ~ear portion of handle 152. This twists lock actuator rod 150 and pivots bell crank lSl upwardly. This in turn pivots lock plate 140 in a counter-clockwlse direction as viewed in ~'igure ~, thereby causing the bottom edges of lock plate sidewalls 14~ to come into position above the lip 15 oE the rear portioll of stationary housing 10.
This makes it impossible to pivot back support arms 60 down-wardly and hence makes it impossible to tilt rearwardly in the chair to which chair control 1 is mounted.
O~ course, it is understood that the above is merely 1 a preferred embodlment of the invention and that:various changes and alterati.ons can b~ made without departing from the spirit and broader aspects thereof as more particularly defined in the appended claims.
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1 the ends of the arbor 31 of bias means 30 and pivot with respect to stationary control housing lQ. Chair seat support stretcher assembly 70 is pivotally mounted at its rear directly to back swpport 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 could be direct, but in the embodiment shown is through a seat adjus*ment assembly 80 which does not comprisepart of this invention per se and hence is not described in detail below.
Tiltable back support arms 60 and seat support 70 can be locked against tilting movement by chair control locking plate 140. Rigid locking plate 140 pivotally ~ mounted on back support arms 60 can be rotated by actuator - rod 150 into operable engagement with the rear of stationary housing 10, thereby blocking tilting movement.
Chair control 1 as shown is a synchrotilt control, ha~ing a seat tilt member and back tilt member which both tilt, but at different rates. The present invention would also be operable in other types o controls where only one tiltable member is provided. Also, other desirable features are shown in the drawings and may be briefly referred to herein, but they are not described in detail since they do not pertain per se to the locking assembly 140.
Stationary control housing 10 is a stamped or other-wise ~ormed metal dish ha~ing 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 o:E spindle Z extends. A spindle mounting plate 16 is welded to the in-side of housing 10 and includes an aperture 17 therein to also l receive ~he upper end of spindle assembly 2 (Figs. 1 and 2).
Bias means 30 comprises a torsional coil spring arrangement. An arbor 31 W]liC}l iS generally circular in cross sectional con:figuration extends through holes 17 in side walls 12 of stationary control housing 10 ~compare to 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 adjust-ment is achieved by tightening or loosening tension bolt 40 in retainer nut S9. Basically, tension adjustment bolt assembly ~0 comprises a bolt 40a having a hollow shank normally housing a lever ~7. One can grasp gripping cap 51, retract lever ~7, pivot it to one side into a slot ~3a and rotate it to thread bolt ~Oa up or down in retainer 59.
Chair back support arms 60 are formed of metal and are pre~erably channel shaped in cross section having a top wall 63, a side wall 6~ and a bottom wall 65 (Fig. 2). There are ~wo 5uch chair back mounting arms 60, one located on either side of statllonary housing 10 (Fig. 1). The generally channel shape cross section allows one to sl:ip a chair back support frame or arm into the channels.
The arbor mounting hole or holes 61 in the side wall 6~ o-f chair back support arm 60 is visible through the hole 17 in the side of stationary housing 10 in Figura 2.
1 'I'here are ~wo semi-circles 61 spaced by a br:idge 62. The ends of arbor 30 are slotted so that they f:Lt 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 p:ivot and arbor 30 rotates within its plastic end bearings 35.
On top wall 63 o-f 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 the 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 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. There is an aperture 78a in the same side stretcher and a similar aperture 78 in the other side stretcher 70a through which the chair control lock actuator rod 150 extends.
Located towards ~he rear oE each slde wall 72 o:~
each stretcher 70a is a rear axle receiving hole 79 ~Pig. 6) which receives the end of rear axle 68 carried in a suitable plastic bearing of ~ r~ shaped longitudinal cross section 79a(~ig.
2~
1 1). 0~ course, suitable retainer clips 79b or the like then hold rear axle 68 in position (hidden in Fig. 1).
The purpose of locking plate 140 is to lock the chair back in its upright condition, making it impossible for S a person to tilt the chair and chair control 1 rearwardly.
Referring to Figures 1, 4, 7 and 8, it will be seen that locking pla~e 140 comprises a rigid metal plate which has been formed to define a pair of spaced side walls 142 and a middle leg 143, all projecting in the same direction from and joined by a back wall 141. Each side wall 142 includes a key-hole opening 144 therein, Middle leg 143 simply includes a round hole 145 therein. Locking plate 140 is plvotally mounted to chair control assembly 1 by means of rear axle 68 ex-tending through keyholes 144 and hole 145, all of which are in alignment with one another. As can be seen by reerence to Figure 1, each axle bearing sleeve 68a extends inwardly sufficiently far that a portion thereof extends through each of the end openings l44 in side walls 142. As can be seen by reference to Figure 8, each bearing sleeve 68a also includes Z0 a small projecting spline 68b which extendc~ into the slot portion of keyhole 144. Spline 68b is narrower than the width of the slot portion of keyhole 144 so thatl-~ckplate 140 can be rotated about bearing 68a, yet spline 68b serves as a stop to prevent rotation beyond certain limits. Preerably~
spline 68b is integrally molded of plastic with bearing sleeve 68a so that spline 68b makes relatively little noise when contacting the sides o~ keyhole 144. This prevents plate 140 ~rom clanking noisely against lip 15 on housing 10.
Bearing sleeve 68a will not itself rotate relative to chair back support arms 60 in that it includes other splines 68c received within similar notches in the apertures 66 in arms ~. ' ~::
~5~
60 (see Figs. 1 and 2).
Referring to Figure 4, it can thus be seen that 7a-1 when locking plate 1~0 is rotated counterclockwise as viewed in Figure ~ the bottom o-f its side walls 1~2 will come into position above the lip 15 along the rear edge of stationary housing 10. Side walls 1~2 are dimensioned such that when in that position, one cannot tilt back support arms 60 downwardly since the bottom edge of side walls 142 immediately comes into abutment with lip 15, or preferably into abutmen-t with some sort of sound deadening plastic bumper, not shown in Figure 4. When in this locking position, plate 140 is in operable engagement with stationary housing 10 in and with tilting back supports 60 in that it blocks any significant relative tilting of the two. As thus intended, the term operable engagement still allows for a slight space between plate 140 and housing 10 when the control is "at rest".
In order to facilitate rotation of lock plate 140 from its unlocked condition as shown in Figure 4 to its locked condition as described above, a lock actuator rod 150 is provided which extends through a hole 78 in one side stretcher 70a ~compareFigs. 1 and 2) and is rotatably received in a similar hole 78a in the opposite side stretcher 70a (see also Fig. 5 where holes 78 and 78a are shown hidden). It will be noted that seat support 70 is located above back support 60 in elevation, in part so that lock actuator rod 150 will extend out over one back swpport 60 without inter-~ering with it ~igs. 2-~. Indeed, l~aclc support arm 60 deviates downwardly after lt goes over pivot axel 68 and then slopes back up-wardly towards the Eront o~ control 1 so as to create a de-pression in the vicinity of lock actuator 150, thereby, in-suring an absence o~ intererence even when control 1 is tllted.
Lock actuator rod 150 includes a generally U-shaped q~
1 devia~ion or lever or bell crank portion 151 in its central part. The base of lever or bell crank portion 15l is located within a notch 146 cut in che end oE rniddle leg 143 of lock plate 140 (Fig. g). Mounted Oll the end of lock rod lS0 is S an enlarged handle 15~. By depressing handle 152 towards either side of its axis of pivoting, one rotates rod 150 and thereby moves bell crank 151 upwardly or downwardly. This in turn rotates lock plate 140 about rear axle 68 and facili-tates movement of lock plate 140 from its locked to unlocked condition or visa-versa.
Spring 160 (Figs. 1, 9 and 10) biases lock plate 140 and lock actuator rod 150 to either the unlocked position or locked position through an over center action. This pre-vents lock plate 140 from being inadvertently moved one way or the other. Referring particularly to Figu~es 9 and 10, it will be seen that spring 160 comprises a pair of open looped ends 161 which are located in side by side, spaced relationship.
Each then is bent into a rearwardly extending leg 163 which in turn terminates in an upwardly bent upwardly e~tending rear leg 163. Legs 163 are joined at their ends by a short bight 164. When viewed from the encl (Fig. 10), spring 160 has a generally U-shaped configuration at one end, with legs 163 defining the sides of the "U". In assembly, spring 160 fits over leg 143 of back plate 1~0 such that bigilt 164 Eits into ~S a small notch 147 cut into the top o leg 143 ~Pig. 8~. The looped ends 161 then Eit over and are pre~erably closed around the base o~ bell crank 151 oE lock rod 150. Spring 160 then tends to hold lock plate 140 in either its locked or unlocked condition, depending on the position oE bell crank 151.
g ~ith the var:ious assemblies, sub assemblies and components thus described, the operation of chair control 1 can be more fully appreciated. As a person leans back in a chair to which chair control 1 is assembled, the chair back support arms 60 begin to pivot about their pivotal mounting (on arbor 31) to stationary housin~ 10. At the same time the rear of seat suppor~ stretcher assembly 70 begins to shi~t downwardly relative to its -front since chair ; 10 seat support stretcher assembly 70 is pivotally joined to back support arms 60 by rear axle 68. The front of seat support assembly 70 pivots about front axle 89 which, along with its bushings 99, slides rearwardly in tracks 20. Figures 2 and 3 illustrate chair control 1 in its untilted and fully tilted conditions respectively. The various pivot points are located such that the chair back tilts rearwardly at a rate ; which is approximately twice as fast as the rate of tilt for the seat.
If one wishes to lock the chair against any tilting motion, one simply reaches under the side of the chair seat and pushes upwardly against the ~ear portion of handle 152. This twists lock actuator rod 150 and pivots bell crank lSl upwardly. This in turn pivots lock plate 140 in a counter-clockwlse direction as viewed in ~'igure ~, thereby causing the bottom edges of lock plate sidewalls 14~ to come into position above the lip 15 oE the rear portioll of stationary housing 10.
This makes it impossible to pivot back support arms 60 down-wardly and hence makes it impossible to tilt rearwardly in the chair to which chair control 1 is mounted.
O~ course, it is understood that the above is merely 1 a preferred embodlment of the invention and that:various changes and alterati.ons can b~ made without departing from the spirit and broader aspects thereof as more particularly defined in the appended claims.
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Claims
The embodiment of the invention in which an exclusive property or privilege is claimed are defined as follows.
In a chair control having a stationary member for mounting to a base, a tiltable member pivotally mounted with respect to said stationary member, bias means operably connected between said stationary and tiltable members for controlling the rate of tilt of said tiltable member with respect to said stationary member and for biasing said tilt-able member to a normal position, and means for locking said tiltable member with respect to said stationary member, the improvement in said chair control comprising: said looking means including a rigid member movably mounted on said chair control; actuator means mounted on said chair control and operably connected to said rigid member for moving said rigid member between a locking position and an unlocking position, said rigid member being of such a configuration and having such an orientation in its mounting to said chair control that when in said locking position, it extends from a position of operable engagement with said tilting member to a position of operable engagement with said stationary member, thereby preventing relative movement of the two, and such that when in said unlocking position, it is out of operable engage-ment with one of said tiltable and stationary members whereby said tiltable member can tilt with respect to said stationary member.
The chair control of claim 1 which includes stop means positioned to abut said rigid member and stop it, as it is moved towards said locking position, at a point just short of physical engagement with said one member whereby movement of said rigid member into said locking position will not cause it to clank noisely against said one member.
The chair control of claim 2 in which said rigid member is mounted for pivotal movement on a pivot axle which is mounted to said other of said tiltable and stationary members.
The chair control of claim 3 in which said stop means comprises: said rigid member including a keyhole opening, said pivot axle passing through the enlarged por-tion of said keyhole opening and including a spline extend-ing into the slot of said keyhole opening, said pivot axle and said spline being held against rotation and said spline being smaller in width than the width of said slot of said keyhole whereby said rigid member can be pivoted about said pivot axle from the point of engagement of said spline with one side of said slot to the point of engagement of said spline with the other side of said slot.
The chair control of claim 4 in which said spline is integrally molded of plastic with a sleeve which fits onto said pivot axle whereby the engagement of said keyhole slot with said spline is relatively noise free.
The chair control of claim 5 in which said rigid member is pivotally mounted on said tiltable member.
The chair control of claim 6 in which said actuator means is pivotally mounted on said tiltable member.
The chair control of claim 4 in which said actuator means comprises: a pivotally mounted rod having a deviation therein defining a lever, said lever engaging said rigid member and pivoting said rigid member when said rod is twisted.
The chair control of claim 7 in which said actuator means comprises: a pivotally mounted rod having a deviation therein defining a lever, said lever engaging said rigid member and pivoting said rigid member when said rod is twisted.
The chair control of claim 8 in which said rigid member includes a leg projecting laterally of said pivot axle and having a slot therein which engages said lever of said actuator rod.
The chair control of claim 9 in which said rigid member includes a leg projecting laterally of said pivot axle and having a slot therein which engages said lever of said actuator rod.
The chair control of claim 10 in which said slot in said leg is opened ended whereby said lever of said actuator rod can be slid readily into engagement with said slot.
The chair control of claim 11 in which said slot in said leg is opened ended whereby said lever of said actuator rod can be slid readily into engagement with said slot.
The chair control of claim 12 which comprises:
spring means operably mounted between said lever of said actuator rod and said rigid member for biasing said rigid member towards either its locking or unlocking position.
The chair control of claim 13 which comprises:
spring means operably mounted between said lever of said actuator rod and said rigid member for biasing said rigid member towards either its locking or unlocking position.
The chair control of claim 14 in which said spring means operably engages said actuator rod on its axis of rotation and operably engages and pushes against said rigid member at point which moves through a plane extending from the axis of rotation of said actuator rod and the axis of rotation of said rigid member as said rigid member is shifted between its locking and unlocking positions.
The chair control of claim 15 in which said spring means operably engages said actuator rod on its axis of rotation and operably engages and pushes against said rigid member at point which moves through a plane extending from the axis of rotation of said actuator rod and the axis of rotation of said rigid member as said rigid member is shifted between its locking and unlocking The chair control of claim 16 in which said rigid member leg includes a notch therein, said spring means being seated in said notch.
The chair control of claim 17 in which said rigid member leg includes a notch therein, said spring means being seated in said notch.
The chair control of claim 18 or 19 in which said leg includes an aperture therein through which said pivot axle extends.
The chair control of claim 18 in which said rigid member includes a generally flat plate.
The chair control of claim 19 in which said rigid member includes a generally flat plate.
The chair control of claim 21 in which said plate is a metal plate and said leg of said rigid member is integrally formed of said metal plate, being bent laterally out of the plane of said plate.
The chair control of claim 22 in which said plate is a metal plate and said leg of said rigid member is integrally formed of said metal plate, being bent laterally out of the plane of said plate.
The chair control of claim 23 in which said rigid member further comprises a pair of spaced end legs on either side of said leg, said end legs being integrally formed of said metal plate by bending laterally out of the plane of said plate, said end legs having apertures therein through which said pivot axle passes.
The chair control of claim 24 in which said rigid member further comprises a pair of spaced end legs on either side of said leg, said end legs being integrally formed of said metal plate by bending laterally out of the plane of said plate, said end legs having apertures therein through which said pivot axle passes.
The chair control of claim 25 in which said end legs of said rigid member extend over the rear edge of said stationary member when said rigid member is in its locking position, said end legs comprising that portion of said rigid member which are in operable engagement with said stationary member when said rigid member is in its locking position, said rear legs being positioned in very close proximity to the rear of said stationary member but being slightly spaced therefrom whereby they do not clank noisely against said stationary member when said rigid member is moved into its locking position.
The chair control of claim 26 in which said end legs of said rigid member extend over the rear edge of said stationary member when said rigid member is in its locking position, said end legs comprising that portion of said rigid member which are in operable engagement with said stationary member when said rigid member is in its locking position, said rear legs being positioned in very close proximity to the rear of said stationary member but being slightly spaced therefrom whereby they do not clank noisely against said stationary member when said rigid member is moved into its locking position.
The chair control of claim 27 or 28 in which said plate of said rigid member extends downwardly farther than said end legs to a point generally behind the rear of said stationary member in close proximity thereto but just out of engagement therewith when said chair control is in its normal position.
The chair control of claim 18, 19 in which said spring comprises a pair of looped ends looped around said actuator rod on its axis of rotation, a rearwardly extending leg extending rearwardly from each of said looped ends, an upwardly extending leg extending upwardly from each of said rearwardly extending legs and a bight portion joining the ends of said upwardly extending legs, said bight portion being seated in said notch of said leg on said rigid member.
The chair control of claim 1 in which said actuator means comprises: a pivotally mounted rod having a deviation therein defining a lever, said lever engaging said rigid member and pivoting said rigid member when said rod is twisted.
The chair control of claim 2 in which said actuator means comprises: a pivotally mounted rod having a deviation therein defining a lever, said lever engaging said rigid member and pivoting said rigid member when said rod is twisted.
The chair control of claim 31 which comprises: spring means operably mounted between said lever of said actuator rod and said rigid member for biasing said rigid member towards either its looking or unlocking position.
The chair control of claim 32 which comprises spring means operably mounted between said lever of said actuator rod and said rigid member for biasing said rigid member towards either its locking or unlocking position.
The chair control of claim 33 in which said spring means operably engages said actuator rod on its axis of rotation and operably engages and pushes against said rigid member at point which moves through a plane extending from the axis of rotation of said actuator rod and the axis of rotation of said rigid member as said rigid member is shifted between its locking and unlocking positions.
The chair control of claim 34 in which said spring means operably engages said actuator rod on its axis of rotation and operably engages and pushes against said rigid member at point which moves through a plane extending from the axis of rotation of said actuator rod and the axis of rotation of said rigid member as said rigid member is shifted between its locking and unlocking positions.
The chair control of claim 35 or 36 in which said rigid member includes a leg projecting laterally of said pivot axle and having a slot therein which engages said lever of said actuator rod; said leg including a notch therein; said spring means being seated in said notch.
The chair control of claim 1 in which said rigid member includes a generally flat plate.
The chair control of claim 38 in which said rigid member is mounted for pivotal movement on a pivot axle which is mounted to said other of said tiltable and stationary members; said rigid member including a leg projecting laterally of said pivot axle and having a slot therein which engages said lever of said actuator rod;
said rigid member including a generally flat metal plate, said leg of said rigid member being integrally formed of said metal plate and being bent laterally out of the plane of said metal plate.
The chair control of claim 39 in which said rigid member further comprises a pair of spaced end legs on either side of said leg, said end legs being integrally formed of said metal plate by bending laterally out of the plane of said plate, said end legs having apertures therein through which said pivot axle passes.
The chair control of claim 40 which comprises a spring having a pair of looped ends looped around said actuator rod on its axis of rotation, a rearwardly extending leg extending rearwardly from each of said looped ends, an upwardly extending leg extending upwardly from each of said rearwardly extending legs and a bight portion joining the ends of said upwardly extending legs, said bight portion being seated in said notch of said leg on said rigid member to bias said rigid member toward either its locking or unlocking position.
The chair control of claim 38 in which said rigid member further includes a pair of spaced end legs which extend over the rear edge of said stationary member when said rigid member is in its locking position, said end legs comprising that portion of said rigid member which are in operable engagement with said stationary member when said rigid member is in its locking position, said rear legs being positioned in very close proximity to the rear of said stationary member but being spaced slightly therefrom whereby they do not clank noisely against said stationary member when said rigid member is moved into its locking position.
The chair control of claim 42 in which said plate of said rigid member extends downwardly farther than said end legs to a point generally behind the rear of said stationary member, in close proximity thereto but just out of engagement therewith when said chair control is in its normal position.
In a chair control having a stationary member for mounting to a base, a tiltable member pivotally mounted with respect to said stationary member, bias means operably connected between said stationary and tiltable members for controlling the rate of tilt of said tiltable member with respect to said stationary member and for biasing said tilt-able member to a normal position, and means for locking said tiltable member with respect to said stationary member, the improvement in said chair control comprising: said looking means including a rigid member movably mounted on said chair control; actuator means mounted on said chair control and operably connected to said rigid member for moving said rigid member between a locking position and an unlocking position, said rigid member being of such a configuration and having such an orientation in its mounting to said chair control that when in said locking position, it extends from a position of operable engagement with said tilting member to a position of operable engagement with said stationary member, thereby preventing relative movement of the two, and such that when in said unlocking position, it is out of operable engage-ment with one of said tiltable and stationary members whereby said tiltable member can tilt with respect to said stationary member.
The chair control of claim 1 which includes stop means positioned to abut said rigid member and stop it, as it is moved towards said locking position, at a point just short of physical engagement with said one member whereby movement of said rigid member into said locking position will not cause it to clank noisely against said one member.
The chair control of claim 2 in which said rigid member is mounted for pivotal movement on a pivot axle which is mounted to said other of said tiltable and stationary members.
The chair control of claim 3 in which said stop means comprises: said rigid member including a keyhole opening, said pivot axle passing through the enlarged por-tion of said keyhole opening and including a spline extend-ing into the slot of said keyhole opening, said pivot axle and said spline being held against rotation and said spline being smaller in width than the width of said slot of said keyhole whereby said rigid member can be pivoted about said pivot axle from the point of engagement of said spline with one side of said slot to the point of engagement of said spline with the other side of said slot.
The chair control of claim 4 in which said spline is integrally molded of plastic with a sleeve which fits onto said pivot axle whereby the engagement of said keyhole slot with said spline is relatively noise free.
The chair control of claim 5 in which said rigid member is pivotally mounted on said tiltable member.
The chair control of claim 6 in which said actuator means is pivotally mounted on said tiltable member.
The chair control of claim 4 in which said actuator means comprises: a pivotally mounted rod having a deviation therein defining a lever, said lever engaging said rigid member and pivoting said rigid member when said rod is twisted.
The chair control of claim 7 in which said actuator means comprises: a pivotally mounted rod having a deviation therein defining a lever, said lever engaging said rigid member and pivoting said rigid member when said rod is twisted.
The chair control of claim 8 in which said rigid member includes a leg projecting laterally of said pivot axle and having a slot therein which engages said lever of said actuator rod.
The chair control of claim 9 in which said rigid member includes a leg projecting laterally of said pivot axle and having a slot therein which engages said lever of said actuator rod.
The chair control of claim 10 in which said slot in said leg is opened ended whereby said lever of said actuator rod can be slid readily into engagement with said slot.
The chair control of claim 11 in which said slot in said leg is opened ended whereby said lever of said actuator rod can be slid readily into engagement with said slot.
The chair control of claim 12 which comprises:
spring means operably mounted between said lever of said actuator rod and said rigid member for biasing said rigid member towards either its locking or unlocking position.
The chair control of claim 13 which comprises:
spring means operably mounted between said lever of said actuator rod and said rigid member for biasing said rigid member towards either its locking or unlocking position.
The chair control of claim 14 in which said spring means operably engages said actuator rod on its axis of rotation and operably engages and pushes against said rigid member at point which moves through a plane extending from the axis of rotation of said actuator rod and the axis of rotation of said rigid member as said rigid member is shifted between its locking and unlocking positions.
The chair control of claim 15 in which said spring means operably engages said actuator rod on its axis of rotation and operably engages and pushes against said rigid member at point which moves through a plane extending from the axis of rotation of said actuator rod and the axis of rotation of said rigid member as said rigid member is shifted between its locking and unlocking The chair control of claim 16 in which said rigid member leg includes a notch therein, said spring means being seated in said notch.
The chair control of claim 17 in which said rigid member leg includes a notch therein, said spring means being seated in said notch.
The chair control of claim 18 or 19 in which said leg includes an aperture therein through which said pivot axle extends.
The chair control of claim 18 in which said rigid member includes a generally flat plate.
The chair control of claim 19 in which said rigid member includes a generally flat plate.
The chair control of claim 21 in which said plate is a metal plate and said leg of said rigid member is integrally formed of said metal plate, being bent laterally out of the plane of said plate.
The chair control of claim 22 in which said plate is a metal plate and said leg of said rigid member is integrally formed of said metal plate, being bent laterally out of the plane of said plate.
The chair control of claim 23 in which said rigid member further comprises a pair of spaced end legs on either side of said leg, said end legs being integrally formed of said metal plate by bending laterally out of the plane of said plate, said end legs having apertures therein through which said pivot axle passes.
The chair control of claim 24 in which said rigid member further comprises a pair of spaced end legs on either side of said leg, said end legs being integrally formed of said metal plate by bending laterally out of the plane of said plate, said end legs having apertures therein through which said pivot axle passes.
The chair control of claim 25 in which said end legs of said rigid member extend over the rear edge of said stationary member when said rigid member is in its locking position, said end legs comprising that portion of said rigid member which are in operable engagement with said stationary member when said rigid member is in its locking position, said rear legs being positioned in very close proximity to the rear of said stationary member but being slightly spaced therefrom whereby they do not clank noisely against said stationary member when said rigid member is moved into its locking position.
The chair control of claim 26 in which said end legs of said rigid member extend over the rear edge of said stationary member when said rigid member is in its locking position, said end legs comprising that portion of said rigid member which are in operable engagement with said stationary member when said rigid member is in its locking position, said rear legs being positioned in very close proximity to the rear of said stationary member but being slightly spaced therefrom whereby they do not clank noisely against said stationary member when said rigid member is moved into its locking position.
The chair control of claim 27 or 28 in which said plate of said rigid member extends downwardly farther than said end legs to a point generally behind the rear of said stationary member in close proximity thereto but just out of engagement therewith when said chair control is in its normal position.
The chair control of claim 18, 19 in which said spring comprises a pair of looped ends looped around said actuator rod on its axis of rotation, a rearwardly extending leg extending rearwardly from each of said looped ends, an upwardly extending leg extending upwardly from each of said rearwardly extending legs and a bight portion joining the ends of said upwardly extending legs, said bight portion being seated in said notch of said leg on said rigid member.
The chair control of claim 1 in which said actuator means comprises: a pivotally mounted rod having a deviation therein defining a lever, said lever engaging said rigid member and pivoting said rigid member when said rod is twisted.
The chair control of claim 2 in which said actuator means comprises: a pivotally mounted rod having a deviation therein defining a lever, said lever engaging said rigid member and pivoting said rigid member when said rod is twisted.
The chair control of claim 31 which comprises: spring means operably mounted between said lever of said actuator rod and said rigid member for biasing said rigid member towards either its looking or unlocking position.
The chair control of claim 32 which comprises spring means operably mounted between said lever of said actuator rod and said rigid member for biasing said rigid member towards either its locking or unlocking position.
The chair control of claim 33 in which said spring means operably engages said actuator rod on its axis of rotation and operably engages and pushes against said rigid member at point which moves through a plane extending from the axis of rotation of said actuator rod and the axis of rotation of said rigid member as said rigid member is shifted between its locking and unlocking positions.
The chair control of claim 34 in which said spring means operably engages said actuator rod on its axis of rotation and operably engages and pushes against said rigid member at point which moves through a plane extending from the axis of rotation of said actuator rod and the axis of rotation of said rigid member as said rigid member is shifted between its locking and unlocking positions.
The chair control of claim 35 or 36 in which said rigid member includes a leg projecting laterally of said pivot axle and having a slot therein which engages said lever of said actuator rod; said leg including a notch therein; said spring means being seated in said notch.
The chair control of claim 1 in which said rigid member includes a generally flat plate.
The chair control of claim 38 in which said rigid member is mounted for pivotal movement on a pivot axle which is mounted to said other of said tiltable and stationary members; said rigid member including a leg projecting laterally of said pivot axle and having a slot therein which engages said lever of said actuator rod;
said rigid member including a generally flat metal plate, said leg of said rigid member being integrally formed of said metal plate and being bent laterally out of the plane of said metal plate.
The chair control of claim 39 in which said rigid member further comprises a pair of spaced end legs on either side of said leg, said end legs being integrally formed of said metal plate by bending laterally out of the plane of said plate, said end legs having apertures therein through which said pivot axle passes.
The chair control of claim 40 which comprises a spring having a pair of looped ends looped around said actuator rod on its axis of rotation, a rearwardly extending leg extending rearwardly from each of said looped ends, an upwardly extending leg extending upwardly from each of said rearwardly extending legs and a bight portion joining the ends of said upwardly extending legs, said bight portion being seated in said notch of said leg on said rigid member to bias said rigid member toward either its locking or unlocking position.
The chair control of claim 38 in which said rigid member further includes a pair of spaced end legs which extend over the rear edge of said stationary member when said rigid member is in its locking position, said end legs comprising that portion of said rigid member which are in operable engagement with said stationary member when said rigid member is in its locking position, said rear legs being positioned in very close proximity to the rear of said stationary member but being spaced slightly therefrom whereby they do not clank noisely against said stationary member when said rigid member is moved into its locking position.
The chair control of claim 42 in which said plate of said rigid member extends downwardly farther than said end legs to a point generally behind the rear of said stationary member, in close proximity thereto but just out of engagement therewith when said chair control is in its normal position.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US145,622 | 1980-05-01 | ||
| US06/145,622 US4438898A (en) | 1980-05-01 | 1980-05-01 | Chain control locking assembly |
| US06/145,439 US4314728A (en) | 1980-05-01 | 1980-05-01 | Chair control |
| US06/145,624 US4375301A (en) | 1980-05-01 | 1980-05-01 | Chair seat adjustment assembly |
| US06/145,854 US4390206A (en) | 1980-05-01 | 1980-05-01 | Synchrotilt chair control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1156922A true CA1156922A (en) | 1983-11-15 |
Family
ID=42246360
Family Applications (4)
| 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 |
| CA000375862A Expired CA1162833A (en) | 1980-05-01 | 1981-04-21 | Chair seat adjustment assembly |
| CA000376139A Expired CA1157366A (en) | 1980-05-01 | 1981-04-24 | Synchrotilt chair control |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000375846A Expired CA1162832A (en) | 1980-05-01 | 1981-04-21 | Chair control |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000375862A Expired CA1162833A (en) | 1980-05-01 | 1981-04-21 | Chair seat adjustment assembly |
| CA000376139A Expired CA1157366A (en) | 1980-05-01 | 1981-04-24 | Synchrotilt chair control |
Country Status (5)
| Country | Link |
|---|---|
| US (4) | US4438898A (en) |
| EP (2) | EP0039576B1 (en) |
| CA (4) | CA1162832A (en) |
| DE (2) | DE3172578D1 (en) |
| ES (2) | ES501793A0 (en) |
Families Citing this family (66)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8133573U1 (en) * | 1981-11-17 | 1983-05-05 | Fritz Bauer + Söhne oHG, 8503 Altdorf | LOCKABLE LOCKING DEVICE FOR SEAT PARTS OF SEAT FURNITURE |
| US4494795A (en) * | 1982-05-06 | 1985-01-22 | Steelcase Inc. | Variable back adjuster for chairs |
| JPS59207112A (en) * | 1983-05-10 | 1984-11-24 | メ−コ−工業株式会社 | Chair |
| DE3335463A1 (en) * | 1983-09-30 | 1985-04-11 | Fritz Bauer + Söhne oHG, 8503 Altdorf | CARRYING DEVICE FOR SEAT FURNITURE WITH ADJUSTABLE BACKREST SUPPORT AND ADJUSTABLE SEAT |
| DE8401000U1 (en) * | 1984-01-14 | 1984-04-05 | Mauser Waldeck AG, 3544 Waldeck | SWIVEL CHAIR |
| DE3521488A1 (en) * | 1985-06-14 | 1986-12-18 | August Fröscher GmbH & Co KG, 7141 Steinheim | WORK CHAIR |
| IT1202168B (en) * | 1985-07-18 | 1989-02-02 | Coop Operai Mobilieri | ANATOMICAL ARMCHAIR |
| SE461312B (en) * | 1986-02-19 | 1990-02-05 | Swing Matic Ab | SWING MECHANISM WITH ARRANGEMENT |
| US5567012A (en) * | 1986-04-10 | 1996-10-22 | Steelcase, Inc. | Chair control |
| US4776633A (en) * | 1986-04-10 | 1988-10-11 | Steelcase Inc. | Integrated chair and control |
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-
1980
- 1980-05-01 US US06/145,622 patent/US4438898A/en not_active Expired - Lifetime
- 1980-05-01 US US06/145,624 patent/US4375301A/en not_active Expired - Lifetime
- 1980-05-01 US US06/145,439 patent/US4314728A/en not_active Expired - Lifetime
- 1980-05-01 US US06/145,854 patent/US4390206A/en not_active Expired - Lifetime
-
1981
- 1981-04-21 CA CA000375846A patent/CA1162832A/en not_active Expired
- 1981-04-21 CA CA000375774A patent/CA1156922A/en not_active Expired
- 1981-04-21 CA CA000375862A patent/CA1162833A/en not_active Expired
- 1981-04-24 CA CA000376139A patent/CA1157366A/en not_active Expired
- 1981-04-29 DE DE8181301892T patent/DE3172578D1/en not_active Expired
- 1981-04-29 EP EP19810301892 patent/EP0039576B1/en not_active Expired
- 1981-04-29 DE DE8181301890T patent/DE3172808D1/en not_active Expired
- 1981-04-29 EP EP19810301890 patent/EP0039574B1/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 |
|---|---|
| EP0039574B1 (en) | 1985-11-06 |
| EP0039574A2 (en) | 1981-11-11 |
| CA1162833A (en) | 1984-02-28 |
| US4438898A (en) | 1984-03-27 |
| ES8207420A1 (en) | 1982-09-16 |
| EP0039576A3 (en) | 1982-06-16 |
| EP0039576A2 (en) | 1981-11-11 |
| DE3172808D1 (en) | 1985-12-12 |
| DE3172578D1 (en) | 1985-11-14 |
| CA1162832A (en) | 1984-02-28 |
| CA1157366A (en) | 1983-11-22 |
| EP0039574A3 (en) | 1982-06-23 |
| EP0039576B1 (en) | 1985-10-09 |
| US4314728A (en) | 1982-02-09 |
| ES8205548A1 (en) | 1982-06-16 |
| ES501793A0 (en) | 1982-06-16 |
| US4375301A (en) | 1983-03-01 |
| US4390206A (en) | 1983-06-28 |
| ES501794A0 (en) | 1982-09-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |