CA2165436A1 - Device for adjusting a flexible supporting element of a back-rest - Google Patents

Device for adjusting a flexible supporting element of a back-rest

Info

Publication number
CA2165436A1
CA2165436A1 CA002165436A CA2165436A CA2165436A1 CA 2165436 A1 CA2165436 A1 CA 2165436A1 CA 002165436 A CA002165436 A CA 002165436A CA 2165436 A CA2165436 A CA 2165436A CA 2165436 A1 CA2165436 A1 CA 2165436A1
Authority
CA
Canada
Prior art keywords
arching
spring
force transmission
fitted
adjusting
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.)
Abandoned
Application number
CA002165436A
Other languages
French (fr)
Inventor
Knud Klingler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AMEU Management Corp
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2165436A1 publication Critical patent/CA2165436A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/64—Back-rests or cushions
    • B60N2/66—Lumbar supports
    • B60N2/667—Lumbar supports having flexible support member bowed by applied forces
    • B60N2/6673—Lumbar supports having flexible support member bowed by applied forces with motor driven adjustments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/64—Back-rests or cushions
    • B60N2/66—Lumbar supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/64—Back-rests or cushions
    • B60N2/66—Lumbar supports
    • B60N2/667—Lumbar supports having flexible support member bowed by applied forces
    • B60N2/6671—Lumbar supports having flexible support member bowed by applied forces with cable actuators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20396—Hand operated
    • Y10T74/20402—Flexible transmitter [e.g., Bowden cable]
    • Y10T74/20408—Constant tension sustaining
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20396—Hand operated
    • Y10T74/20402—Flexible transmitter [e.g., Bowden cable]
    • Y10T74/20462—Specific cable connector or guide

Abstract

The invention relates to an apparatus for adjusting the arching of a resiliently flexible support element (4) for supporting the pelvic and/or lumbular vertebrae in a back rest of a seat including an arching means comprising a spring and an operating means. According to the invention the spring (20, 35; 21, 38) is included in the force transmission tract for adjusting the arching. Preferably a spring (20, 35) is fitted between one end of the support element (4) and the force transmission member of the arching means and/or a spring (21, 38) is fitted to the free end of the force transmission member of the arching means behind the operating means.

Description

AdjnstmPnt apparatus for a resiliclltly flcxible support elclnent of a back rcst The invention relates to an adjustment apparatus for a resiliently flexible support elemen~ of a back rest for adjusting the pelvic and~or lumbular vertebra support with an arching device and an operating device.
Such an adjnstmPnt means is known from US-A-4880271. In that case the support eleml nt consists of two parallel longitll~ l sLrips firmly interconnl~ct~d by means of a plurality of transverse strips. Centrally to Lhe longitu~lin~l strips a further sheet metal strip is fixed at its upper end to the uppermost extreme transverse strip of the support elcment and is also connected to the cams of an excenter device providcd at the lowcr csl(l of tlle support PlemPnt, but not to ~he subsequent transvcrse strips. The e~centPr auld thus also the cam is adjustable by way of a worm gear by an operating means comprising a llandle, in SUCll a manner that the central sheet metal strip, depending Oll the dircction of rotation, brings about an arching or a fl:ltteninE (detensioning), as the case may be, of the support element such that the adjustmPnt of the desired degree of arching can be brought al)out. To the rear of the support element at the upper and lower ends thereof a spring is linked up which draws lhe two ends of the slightly pre-arched support element towards one another, whereby the adjustment in the sense of an increased archillg is supported and thereby f~l ilit~tPd. In this context the spring acts perrn~tlP,ntly onto the support t~lemPnt - even if no adjllstmPnt takes place - and is accordingly in-lepPn(~ent of the operating means.

In additionj the entire mechanism of the arching means is e~ctremely complicated.
Furthermore, which ever degree of arching is set up this is stiff and unyielding, whereby comfort is adversely affected.

It is an object of the invention to so improve an apparatus of the type relerred to in the introduction that inspite of simple construction an easy adjustment of the arching is possible and/or that the temioning force of any particular set up degree of arching can be adjusted more flexibly, the arched region being moreover able to yield.

This object is ~ ined by an apparatus having the ~h~rtpt~ rs of claim 1.

zl 6S43$
.

Due to the preferred embo-liment according to claim 2, tlle ~djusSmPnt force c~n be varied by the spring 3nd ~ certain resiliency of the support element is e~sured, i.~., it is not ngid and is able to yield to relatively strong forces whereby th~ comfort level is increased.

Due to the embodiment according to claim 3, the adjustment forces for arching the support element can be compPnc~tPd for, virtually completely even, by the optional selection of the spring force, so that the adjustment of the degree ()f arching can proceed virtually without force application.

By the embodiment according to claim 4, the advantages of the individual features according to claim 2 and claim 3 are combined with one .~nother.

Further advantageous embodiments of the invention will be apparent from the further subsi~ ry claims.

In what follows, the invention will be further ~Ypl~ined by way of working e~amples with reference to sc-hP-m~tic drawings. There is shown in:

Fig. la, b a back rest comprising a Bowden cable arrangement for adjusting the arching of a support ~lemP-nt in plan view and in side elevation, Figs. 2a, b a back rest in~ ing an eyc~ntpr ~n~mpnt for adjusting the arching of a ~U~pO~ m~nt in plan view and in side elevation, Fig. 3a, b a back rest including traction straps for adjusting the arching in plan view and in side elevation, Fig. 4 a back rest including Bowden cable arrangements and motors for adjusting the arching and the level of the support ~lP-mPnt in plan view.

The back rest illustrated in Figs. 1 to 4 comprises a frame 1 in which between two tIansverse struts 2 a guide is fitted composed of two rods 3 p~r~llPI to one another for a rP~iliPntly flexible support Plem~nt 4 which is fitted movably up and down thereon.
The support çlempnt 4 in the working example according to Fig. 1 comprises a slightly arched panel 5 in one piece the upper end of which is connect~P~ to sliding elements 16 fitted on the rods 3. The panel 5 comprises an upper panel portion 5a for supporting the lumbular vertebrae and a lower portion 5b for supporting the pelvis and the pelvic velL~lae. Between the portions 5a and 5b a linkage mPmher 7 is linked to the rear of the panel 5 and has a free end which is linked to a guide 8 provided on the rods 3.

The back rest co~ 5 an a~l~dlus for aljui,Lulg the arching as well as a means for level adj~lstmPnt of the support PlPmP.nt 4.

The a~lus for level adjul,..~n~ comp~s an axle 9 m~lmtP~d on either or both sides in the side limbs of the frame 1, which axle if mounted on one side may in addition be mounted on either or both of the rods 3. The a~le 9 passes on one side out of the frame 1 and is col-nP~Ied at its free end to a hand wheel 10 of an op~laling ~,P~h~ m. Within the uL,.a~ace between the rods 3, parallel to one another and to the rods 3, two strips 11, 12 are provided, the first strap 11 at one end being fitted to the axle 9 and at its other end to the lower ends of the support ~ n~ 4. The second strap 12 is passed around the lower transverse strut 2 of the frame 1 and at one end is fitted to the lower end of the sul)polL
el~ nl 4 and at the other end to the axle 9. In the position shown in Fig. la the first strap 11 has been wound virtually completely off the axle 9, wh~l~s in this position the second strap 12 has been wound by way of several windings onto the axle 9. The straps 11, 12 are so fLlced to the axle or so wound thereon that as the a~le 9 is turned by means of the hand wheel 10 the one strap 11, 12 is wound up and the other strap 12, 11 is unwound so that the entire support elPmPnt 4 can be moved up and down on the rods 3.

The apparatus for adjusting the arching of the ~UppolL element 4 according to Fig. 1 comprises a Bowden cable arrangement 13. The sheath 14 of the Bowden cable ,.. , -!~P~Pnl 13 is at one end fitted centIally to the upper end of the support PlP.mPnt 4 and at the other end to a fitting 15 of an op~ g means 16 fLsed co~s~ y to the axle 9 to the frame 1. In the fitting 15 a disc-shaped drum 17 is fitted rotatably which by means of a bush on the axis 9 is co~lple~1 to a lever 18 outside of the frame 1. The ~h.~ d cable 19 of the Bowden cable ~ n~ 13 is fixed at one end to the lower end of the linkage 7 by means of an inle.~ te helical spring 20. The other end of the ~he~thed cable 19 e~rtPn-1ing from the sheath 14 is passed around the revolvable drum 17 its free end being so connected to a second helical spring 21 that the end of the sheathed cable is subjected to tensile force.

F~ef~dbly the ~h~ d cable 19 passes around the drum 17 in a non-slipping manner, for which purpose the drum comprises at least one rebate for accommodating at least one projection (not illllct~ted) firmly fitted on the ~h~th~ cable 19. Preferably the limit of movement of the sheathed cable 19 are also limite~ between a zero position and the 111i1~;11111111 desired degree of arching which can be brought about in optional manner, e.g.
by two stop members which may for ~ mI~le coact with the drum 17 or the lever 18 to limit its range of movelllent (not illlls~ted). By virtue of the stop members or the limited defined range of movement ov~rlo~-1ing or even possible destruction due to an uncorlLl~i)lled applic~tion of forces during adj~,~l",.~-nl can be obviated.

In the illustration according to Fig. la the end of the 5hP~thed cable 19 which has been passed around the drum 17 is held under tension by a compressive helical spring 21 s~l~ol~ed from the f~ture 15. However, it is equally possible to provide a tensile spring f~ed to the frame 1.

In the embodiment illustrated in F;g. 2 only an apparatus for adjusting the arching is illustrated. In this case the support element 4 is composed of a single panel having a plurality of lateral cuts provided in its lower region which in the lower region outline projections 31. In the event of arching of the support element 4 these projections 31 emerge from the plane of the support elem~-rlt as appar~nt from Fig. 2b and serve as a support for the pelvic vertebrae.

In this working eY~mr~le likewise an a~le 9 is provided which in the region belween the rods 3 carries a disc 32 which is rigidly con.~ to the a~le 9. In this working I .~."~le the Sllp~lL ele~ 4 at it lower end is lin~ed to the lower L.~,~ struts 2. To each of the lower edge and the upper edge of the ~uppoll element a traction rod 33 and/or 34 ~liv~ly is hookP~, these being hung ~m ~;~.n~ lly oppo~Le loc~litiPs at the edge `- 21 65436 of the disc 32. In one of the traction tension rods 33 or 34 in this case the upper traction rod 34 a spring 35 is inserted.

In the region of the frame l a second disc 36 is provided on the axle 9 on which an end of a cable 36 is fitted z~z~rted to be wound up or ullwoul~d and the free end of which is fitted to the frame l by way of a tensile spring 38.

In the embodiment illustrated in Fig. 3 the au~pOll elem~nt 4 is de~i~ned as explained in the des~ipLion of Fig. l. In Fig. 3 as well only one a~p~dlus for adjuaLing the arching is l~ The embo~im~nt acco.di.lg to Fig. 3 is of the same design as that described in the working PYZtmrl~ of Fig. 2 except that, instead of an ~YC~ntPr ~l~lgelllent comrricing the disc 32 and the traction rods 33, 34, in this case the upper and lower ends of the au~pOll elements 4 are inte~;olmected by a strap 40 which passes in a freely movable ner through the a~le 9 or tlt~rrtzt*vely may be c- nn~ed thereto.

In the working example illustrated in Fig. 4 - in which the springs according to the invention for greater clarity have been omitted - there is provided a Bowden cable ~. ,i.,1~...~n~ 13 which serves both for level as well as for arching a(lju~ - nt of the support elem~-nt 4, there being provided bc;lween the lower end of the sul,polL element 4, in this case taking the form of a metal grid, and the lower Lld~ .~ strut 2 a l~lol~g spring 41 which draws the support el~mPnt 4 l~w~s the lower Lld~ el~e strut 2. The al)p~Lus for adju~Lillg aL~ g is constmcted as described with lerel~.~ce to Fig. l except that the sheath 14 of the Bowden cable arrangement 13 is not fixed to the upper end of the support ~çm~nt 4 but to the free end of an ~ on 42 which is there fitted and that instead of a manu l adjll~tm~nt a gear ~ nhztnt;~m 43 with an electric motor 44 is provided. Likewise a gear mçchztni~m 43 with an electric motor 44 is provided for level adj.~ t Preferably at least all apparatus with manual adjustment are equipped with a free wheel brake 39 (Figs. 1 to 3) which ~,Gve~ an ina(l~ h~ g of the arching and/or level setting, willlùul, huw~,Y~, inhih;~ a vûluntary adjn~tm~nt by means of the hand wheel lO or the lever 18. Preferably the sul)po~ P~n~nt 4 according to Figs. 1 to 3 is made of plastics which offers the advantage of a simple and in*~ l ~n~;~e m~n11f~ re combined with low weight even if optionally ~;~o~ nt~ such a~ ribs or regions of larger cross-section are ` 2165436 provided, since these can easily be manufactured in casting procedures or by deforming.
Preferably the ~uppolL ~lem~ntc 4 according to Figs. 1 and 3 are co~ osed of two parts, the support elemPnt 4 proper and the linkage ~ ..'n--~ 7, in such a manner that they can be assembled without tools, e.g. by insertion of axle stubs into bearings - which permit a ~lede~l~ ned rotation. In the case of the support ~ mPnt 4 accol~ling to Fig. 2 these may also be punched out of a plastics sheet.

The various embo lim~ntc as des-nhe.1 with reference to Figs. 1 to 4 may also be employed in optional suit~ble c~ in~ nc The ~a-alus for adju~Li,lg arching according to Fig. 1 Op~l~t~ as follows:

By re~cin~ the lever 18 from its locked position, where the locking device may be of an optional known type, for example a free wheel brake 39, the drum 17 is turned by a pivotal movement of the lever 18 about t_e axle 9 causing the latter, depending on the direction of rotation, to wind up or unwind the ~h~thed cable 19 of t_e Bowden cable n~ 13. Due to the tensile force of the spring 21 the rotary movement for archingthe ~iUp~ m~ont 4 is supported such that as a result the force required for arching is reduced and arching is f~-~ilit~te~ When making an adjl-~tm~nt with a view to re~1cing the degree of arching the resiliently flexible support element 4 is detensioned and accoldi~gly Lll~ .~y col~n~ the tensile force of the spring 21 so that in that ~itll~tion as well an easy adj-l~tm~nt is provided. Due to the spring 20 inserted beLwæn the end of the ~ht~th~ cable 19 and the sllc~nci~n point in the lower region of the support ~l~m~nt 4 or the link~ge member 7 the particular degree of arching which has been set up is no longer rigid as in known constructions but due to the spring 20 the ~ul~pol~ element can yield r.o~ ntly to major pressure and the entire back rest is thereby supplied with softer and more comfortable char~cten~tics. If the increased plessure is reduced, the spring 20 cnnll.,~ ; again and the previously set up arching is 1~ st~,l~xl.

The apparatus illustrated in Fig. 2 for adjusting the arching operates similar to that described with ~efeience to Fig. 1, in this case a rotary movement of the axle 9 being brought about by the hand wheel 10 after the latter has been r~le~ed from its locked position to bring about a movement of the adjoining ends of the traction rods 33 or 34 in the disc 32 away from or towards one another in respect of their levels whereby the arching or det~on~ioning ~e~Li~ely of the support ~lemP-nt 4 takes place. In this working embodiment the spring 38 which is coupled to the cable 37 and the second disc 36 is so employed that it SU~pOlL~ the force which has to be exercised onto the hand wheel 10 in order to arch the support elf~ n~ 4, i.e. so that the force required for adjusting the degree of arching is likewise reduce~

The working e~mrle illllctr~t~d in Fig. 3 Op~l~t~ analogously to that illustrated in Fig. 2, the belt 40 in this case, on rotation of the axle 9, being wound onto the axle 9 in order to achieve arching, here as well due to the spring 38 which is provided the application of force being reduced by the spring action.

Due to the Su~pGl~ or co,~ n~tion of the forces counteracting the arching adjustm~nt effected by the springs 21 or 28 as the case may be the force to be exerted in order to adjust the degree of arching is substantially reduced so that even low powered and therefore small and low noise electric motors can be employed without difficulty, so that the adj~ "~nl~ can also be p~, rolllled with the aid of motor~riven tr~n~mi~ions. In Fig.
4 electric motors 44 with gear n~h~ni~ms 43 are provided both for adjusting the level as well as the degree of arching. The function of these embo-lim~nt~ is analogous to that d~ ed with le~ e to Fig. 1 except that instead of the rotary movement by means of a hand wheel 10 or the lever 18 this takes place by virtue of the electric reversible motors 44. It is ad~l~lL~us in all embo~i".~t,l~i to limit the ~ e movem~nt~, e.g. by stop formations in order to avoid excessive tensions on the support element 4 which might evenLually result in ~l~m~ge or even destruction.

Claims (11)

Claims:
1. Adjustment apparatus for a resiliently flexible support element of a back rest for adjusting the pelvic and/or lumbular vertebra support comprising an arching device and an operating device, characterised in that at least one spring (20,35: 21,38) is installed in the force transmission tract for adjusting the arching.
2. Apparatus according to claim 1, characterised in that the spring (20, 35) is fitted between a part of the support element (4) and the force transmission part of the arching means.
3. Apparatus according to claim 1, characterised in that the spring (21, 38) is fitted to the free end of the force transmission member of the arching means behind the operating means.
4. Apparatus according to claim 1, characterised in that a first spring (20, 35) is fitted between one part of the support element (4) and the force transmission member of the arching means and a second spring (21, 38) is fitted to the free end of the force transmission member of the arching means behind the operating means.
5. Apparatus according to any one of claims 1 to 4, characterised in that the force transmission member comprising the spring (20) is represented by the sheathed cable (19) of a Bowden cable arrangement (13).
6. Apparatus according to any one of claims 2 to 4, characterised in that the force transmission member comprising the spring (35) is represented by a traction rod (34) of an excenter device.
7. Apparatus according to claim 5, characterised in that the sheathed cable (19) is passed around a disc-shaped drum (17) coupled to the operating means and comprises a spring (20, 21) on each side.
8. Apparatus according to any one of claims 1 to 7, characterised in that the adjustment of the force transmission between two stop members coacting with the operating means, is limited.
9. Apparatus according to any one of claims 1 to 8, characterised in that the operating means includes a free-wheeling brake (39).
10. Apparatus according to any one of claims 1 to 9, characterised in that the support element (4) is made of plastics.
11. Apparatus according to any one of claims 1 to 10, characterised in that the operating means includes an adjustment motor (44).
CA002165436A 1993-06-17 1994-06-16 Device for adjusting a flexible supporting element of a back-rest Abandoned CA2165436A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4320105.9 1993-06-17
DE4320105A DE4320105C1 (en) 1993-06-17 1993-06-17 Adjustment device for a flexurally elastic supporting element of a backrest

Publications (1)

Publication Number Publication Date
CA2165436A1 true CA2165436A1 (en) 1994-12-18

Family

ID=6490560

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002165436A Abandoned CA2165436A1 (en) 1993-06-17 1994-06-16 Device for adjusting a flexible supporting element of a back-rest

Country Status (8)

Country Link
US (4) US5913569A (en)
EP (1) EP0702522B1 (en)
JP (1) JP3708959B2 (en)
AU (1) AU7071994A (en)
CA (1) CA2165436A1 (en)
DE (2) DE4320105C1 (en)
WO (1) WO1995000053A1 (en)
ZA (1) ZA944274B (en)

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JP3708959B2 (en) 2005-10-19
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US6883867B2 (en) 2005-04-26
ZA944274B (en) 1995-02-10
US5913569A (en) 1999-06-22
US6623076B2 (en) 2003-09-23
US20020109383A1 (en) 2002-08-15
US20040075320A1 (en) 2004-04-22
AU7071994A (en) 1995-01-17
EP0702522B1 (en) 1997-03-19
US6447061B1 (en) 2002-09-10
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WO1995000053A1 (en) 1995-01-05
DE59402161D1 (en) 1997-04-24

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