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Publication numberUS2756809 A
Publication typeGrant
Publication dateJul 31, 1956
Filing dateJun 30, 1954
Priority dateJun 30, 1954
Publication numberUS 2756809 A, US 2756809A, US-A-2756809, US2756809 A, US2756809A
InventorsErnst Endresen
Original AssigneeErnst Endresen
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Back support for chairs, car seats, and the like
US 2756809 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

July 31, 1956 ENDRESEN 2,756,809

BACK SUPPORT FOR CHAIRS, CAR SEATS, AND THE LIKE Filed June 50, 1954 United States Patent BACK SUPPORT FoReirAiR's, SEATS, AND THE LIKE Ernst Endresen, St'a'vaiiger, Norway Application June 30, 1954, Serial No. 440,517

3 Claims. (Cl. 155-182) The invention relates to an improved back support for chairs, car seats and the like such as back rests for hospitals, specially designed to counteract and prevent pains in the back, such as sciatica, lumbago and the like, and is concerned primarily with a back rest of the kind consisting of a relatively stiff plate adapted to follow the lines of the human back and having a lower convex part and an upper concave or straight part, the curves of the plate being adjustable by means such as screws which can be manipulated to increase or decrease the convexity and concavity of the plate to suit the seated person.

The arrangement according to the present invention is characterized in that means are provided for moving the ridges of the curvatures in the longitudinal direction of the plate and for adjustment of the transition curve between the shaped parts thereof. Efficient means are thereby obtained whereby the form of the plate can be adjusted in accordance with the particular contour of the back of the seated person, such backline differing from person to person. The back support is specially designed to be placed in the drivers seat of buses and motorcars, but can also be used in hospitals by being placed in bed for a pa tient to lie on or as a back rest.

One example of the device is shown on the accompanying drawing wherein:

Figure 1 shows a longitudinal section taken on the line 1-1 of Figure 2;

Figure 2 is a front view of Figure l and Figure 3 is a horizontal cross section taken on the line 3-3 of Figure 2.

The back support consists of a flexible steel plate 1, mounted for example in a chair frame 2, the back of which is closed by a back plate 6. The lower edge of the steel plate 1 is fastened around a bolt 3 and at the top the upper end is fastened around a bolt 4 slidable in a vertical groove 5, so that the plate has a certain latitude of up and down sliding movement when the curves thereof are regulated.

When the back is adjusted in accordance with a persons back lines, the lower part of the plate 1 must be more or less convex and its upper part more or less concave (or if necessary straight). Convexity and concavity is regulated by means of two screws 7 and 8 which are moved in and out by means of nuts 11 and 12 respectively. The screws '7, 3 have secured at their outer ends crossbars 9 and it), which support the plate 1 transversely, the crossbars 9, being provided with hooked ends 9a and ltla respectively which grip around the side edges of the plate 1. The screws 7, 8 also extend through holes in transverse plates 15 and 16 respectively which are of channel-form in cross section and rest against the side rails 2 and the back plate 6 of the chair frame. The plates 15 and 16 are adjustable vertically so that the ridges or 2 tops of the convex and concave plate parts may be moved in the vertical direction of the plate so that the curves of the plate and the transition curvebetween the convex and concave parts can be altered in-the required manner.

The cross-bars 9, '10'are guided in slots 9b, 101) in the sideflanges of theplate's 1'5, 1'6, aiidin'o'r'der'tb enable vertical iribvemeiits'ofthe nuts11,'1 2,slots 19, 20 are provided in the back plate 6.

To each plate 15 and 16 is fastened a threaded chock which engages screws 13 and 14 operable by means of nuts 17 and E8. Rotation of the nuts 17, 1-8 will cause the plates 15, 16 to be raised or lowered and thereby also the screws 7 and 8 and the cross-bars 9 and 10. In this manner the top points or ridges of the convex and concave parts of the plate 1 are raised or lowered to fit the lines of the back of a seated person, and the transition curve between the two curved parts may also be adjusted, by moving the supporting bars 9 and lit closer together or further apart from each other. Full control of the curves of the back plate 1 is thereby gained and they may be closely adjusted to fit any personal back line.

The whole adjustment may be effected quickly by means of the four nuts 11 and 12 and 17 and 18. The back support may be mounted to swing within a limited angle, in the vertical plane, in a chair frame, so that the cant of the back support may be adjusted while a person is sitting in the chair or seat. The steel plate 1 may be provided with padding and in this case a vertical depression or thinning out in the padding may be arranged vertically in the middle of the back so that the vertebrae are not exposed to pressure. The back support may be mounted so that it can be raised or lowered in the chair frame.

It will be appreciated that constructional detail concerning the chair or seat frame in which the back is fitted may be altered in many ways, the regulation of the ridges of the convex and concave plate parts thereof and the regulation of the transition curve between these two curved parts being the essential features of the invention.

What I claim and desire tosecure by Letters Patent is:

1. A back support for chairs and the like, consisting of a relatively stiff back plate mounted in a chair frame, said back plate being capable of adjustment to the back line of a user, said plate having a lower convex part and an upper concave part, screw means for adjusting the convexity and concavity of said parts and means for adjusting the position of the ridges of the convex and concave parts, said screw means being adjustable in the same direction to control the transition curve between said parts of the plate, vertically slidable plates of channel cross section mounted in the chair frame and carrying said screw means for adjusting the convexity and concavity of the back plate, cross-bars forming part of said screw means, hooked ends to said cross-bars adapted to grip the side edges of the back plate and form a support therefor, said slidable plate being provided with side flanges and said flanges having slots therein to serve as a guide for the said crossbars.

2. A back support for chairs and the like comprising a relatively stitf back plate mounted in a chair frame, said back plate being capable of adjustment to the back line or" a user and having a lower convex part and an upper concave part with ridges defining the same, screw means for adjusting the convexity and concavity of the said convex and concave parts and means for adjusting the position of the ridges of the said convex and concave parts in a vertical direction, said screw means being adjustable in the same direction to control the transition between the convex and concave parts of the plate and including supporting cross bars at their outer ends adapted to support the back plate transversely, the said supporting cross bars having hooked ends adapted to grip the side edges of the back plate.

3. A back support for chairs and the like comprising a relatively still back plate mounted in a chair frame, said back plate being capable of adjustment to the back line of a user and having a lower convex part and an upper concave part with ridges defining the same, screw means for adjusting the convexity and concavity of the said convex and concave parts and means for adjusting the position of the ridges of the said convex and concave parts in a vertical direction, said screw means being adjustable in the same direction to control the transition between the convex and concave parts of the plate, said plate being provided with padding which is vertically thinned out centrally thereof.

References Cited in the file of this patent UNITED STATES PATENTS 958,356 Bode May 17, 1910 1,264,265 Brusius Apr. 30, 1918 1,677,584 Cronwell July 17, 1928 1,937,920 Smith Dec. 5, 1933 2,359,318 Lay et a1 Oct. 3, 1944 2,549,902 Hibbard et al. Apr. 24, 1951 2,550,831 Lingenfelter May 1, 1951 FOREIGN PATENTS 2,598 Great Britain 1899

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US958356 *Nov 1, 1909May 17, 1910Philipp Gustav August BodeUpholstered chair.
US1264265 *Aug 10, 1917Apr 30, 1918Herbert BrusiusAdjustable chair-back.
US1677584 *Jun 30, 1927Jul 17, 1928Gen Motors CorpAdjustable seat structure for automobiles
US1937920 *May 18, 1931Dec 5, 1933Elmer Smith HarryPad for chair and seat backs
US2359318 *Jun 12, 1941Oct 3, 1944Lyman C FisherSpring construction and method of assembling
US2549902 *Oct 2, 1945Apr 24, 1951Hibbard Donald LSeat
US2550831 *Jul 1, 1949May 1, 1951Lingenfelter Robert EAdjustable means for changing the contour of seat back rests
GB189902598A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2843195 *Jan 25, 1956Jul 15, 1958Barvaeus Alvar E ASelf-adjusting back support
US2894565 *May 17, 1957Jul 14, 1959Hubert R CraneContouring back rest for motor vehicle seats
US3106423 *Nov 21, 1961Oct 8, 1963Johann SchwarzBack rest having an adjustable shaped element
US3124389 *Sep 7, 1961Mar 10, 1964 mi kan
US3258259 *Mar 15, 1965Jun 28, 1966Volvo AbSeat backrest with tensioning means
US3463544 *Apr 22, 1968Aug 26, 1969Edward FroelichOrthopedic seat back
US3464754 *Jan 17, 1967Sep 2, 1969Rex Stroll O Chair CoOrthopedic chair
US3596990 *Jan 2, 1969Aug 3, 1971Berger JacobOrthopedic chair
US3880463 *Jan 31, 1973Apr 29, 1975Ipeco Europe LtdSeat with back support
US4153294 *Nov 3, 1977May 8, 1979Messrs. Willibald GrammerApparatus for adjusting the inclination of seat upholstery in a driver's seat, office chair, revolving armchair or the like
US4313637 *Nov 13, 1979Feb 2, 1982Uop Inc.Seat having a movable lumbar support
US4316631 *Dec 6, 1979Feb 23, 1982Steyr-Daimler-Puch AktiengesellschaftBackrest
US4339150 *May 5, 1980Jul 13, 1982Gmsr Ortho Enterprises, Inc.Back support construction
US4350388 *Oct 3, 1978Sep 21, 1982Spina-Trac AbBackrests
US4354709 *Jun 22, 1979Oct 19, 1982Wilhelm SchusterFlexible elastic support
US4452485 *Dec 23, 1981Jun 5, 1984Wilhelm SchusterFlexible elastic support
US4520800 *May 9, 1983Jun 4, 1985Standex International CorporationPatient treatment table
US4601514 *Jan 6, 1984Jul 22, 1986Messrs. Willibald GrammerSeat having an adjustable back support arrangement
US4634178 *Dec 10, 1984Jan 6, 1987Carney Steven HAdaptable seating device
US4915447 *Mar 13, 1989Apr 10, 1990Sears Manufacturing CompanyVehicle seat with adjustable thigh support
US4993164 *Jul 5, 1990Feb 19, 1991Jacobsen Joseph MMeasuring device
US5217278 *Mar 13, 1991Jun 8, 1993Findlay Industries, Inc.Mechanism for providing adjustable lumbar support in a seat
US5344211 *Aug 5, 1993Sep 6, 1994Riyaz AdatAdjustable backrest
US5385531 *Jun 17, 1993Jan 31, 1995Eurokeyton S.A.Massage robot for relaxation armchair
US5474358 *Apr 26, 1993Dec 12, 1995Youngflex S.A.Seat arrangements providing adjustable lumbar support
US5553917 *Jun 30, 1994Sep 10, 1996Bosaro Biotech Inc.Adjustable backrest
US5609394 *Feb 23, 1996Mar 11, 1997Ligon Brothers Manufacturing CompanyFour-way lumbar support
US5624158 *Aug 5, 1994Apr 29, 1997Bosaro Biotech Inc.Adjustable backrest
US5641205 *Feb 12, 1996Jun 24, 1997R. Schmidt GmbhApparatus for adjusting the distribution of pressure in a vehicle seat backrest
US5651583 *Sep 10, 1993Jul 29, 1997Ameu Management Corp.Seat back rest with an adjustment device for a flexible arching element for adjusting the convex curvature of the back rest
US5791733 *Jun 20, 1997Aug 11, 1998Knoll, Inc.Adjustable lumbar support
US6062649 *Mar 3, 1998May 16, 2000Steelcase Development Inc.Chair back construction
US6079785 *Jan 12, 1999Jun 27, 2000Steelcase Development Inc.Chair having adjustable lumbar support
US6099076 *Nov 19, 1999Aug 8, 2000Steelcase Development Inc.Chair back construction
US6126237 *Apr 5, 1999Oct 3, 2000Ritterhouse; Keith I.Adjustable cushioned headrest
US6189972 *Jun 5, 1998Feb 20, 2001Teknion Furniture Systems Inc.Lumbar support adjustment mechanism
US6260921 *Feb 25, 1999Jul 17, 2001Teknion Furniture Systems, Inc.Lumbar support adjustment mechanism
US6394546Nov 3, 2000May 28, 2002Steelcase Development CorporationLumbar device
US6419318Apr 11, 2000Jul 16, 2002United Chair Company, Inc.Chair having an adjustable lumbar mechanism
US6471294May 4, 2000Oct 29, 2002Steelcase Development CorporationAdjustable lumbar support
US6619739Mar 1, 2001Sep 16, 2003L & P Property Management CompanyUniversal ergonomic support with self-contained actuator
US6623076Apr 12, 2002Sep 23, 2003Schukra-Gerätebau AGAdjustment apparatus for a resiliently flexible support element of a back rest
US6652028Nov 2, 2001Nov 25, 2003L & P Property ManagementApparatus and method for lumbar support with variable apex
US6652029Dec 20, 2001Nov 25, 2003L & P Property Management CompanyUnitized back plate and lumbar support
US6666511Aug 21, 2002Dec 23, 2003Schukra Geratebau AgArching mechanism and method of use
US6676214Nov 16, 2001Jan 13, 2004L & P Property Management CompanyMethod and apparatus for lumbar support with integrated actuator housing
US6758522Mar 29, 2002Jul 6, 2004L&P Property Management CompanyApparatus and method for varying coefficients of friction in a variable apex back support
US6779844Dec 14, 2001Aug 24, 2004L&P Propety Maqnagement CompanyArching lumbar support with weight distribution surface
US6883867Sep 22, 2003Apr 26, 2005Schukra Geratebau AgDevice for adjusting a flexible support element of a backrest
US6905170Jan 22, 2003Jun 14, 2005L & P Property Management CompanyFold down seat lumbar support apparatus and method
US6908152Dec 14, 2001Jun 21, 2005L & P Property Management CompanyPush lumbar support with flexible pressure surface
US6908153Dec 2, 2002Jun 21, 2005L&P Property Management CompanyPower lumbar support cable apparatus and method
US6938955Oct 10, 2002Sep 6, 2005L&P Property Management Co.Power lumbar mechanism
US6981743Jun 10, 2004Jan 3, 2006Hni Technologies Inc.Chair with adjustable lumbar support
US7052087Dec 9, 2002May 30, 2006L&P Property Management CompanyMethod and apparatus for a scissors ergonomic support
US7077476Sep 20, 2004Jul 18, 2006L&P Property Management CompanyUniversal ergonomic support with self-contained actuator
US7137664Feb 9, 2004Nov 21, 2006L&P Property Management CompanyAutomatically actuating ergonomic support system for a fold down seat
US7140680Feb 10, 2003Nov 28, 2006L&P Property Management CompanyFold down seat lumbar support apparatus and method
US7237848 *Sep 3, 2004Jul 3, 2007Douglas StoryBack and internal organ supportive belt
US7490899Mar 30, 2007Feb 17, 2009Schukra Of North AmericaCombination lumbar-bolster system
US7614696Dec 11, 2007Nov 10, 2009Schukra Of North AmericaLumbar system for climate seating
US7690726Dec 21, 2005Apr 6, 2010L&P Swiss Holding CompanyCoupling unit and adjusting mechanism using the coupling unit
US7775595Jan 25, 2005Aug 17, 2010Schukra Of North AmericaDrive mechanism
US7841661Sep 26, 2005Nov 30, 2010L&P Swiss Holding CompanyLumbar support assembly and corresponding seat structure
US7841666Sep 16, 2008Nov 30, 2010Herman Miller, Inc.Back support structure
US7878590 *Feb 22, 2010Feb 1, 2011B&B Innovators, LlcVertebral column support for mesh back chairs
US7909402Sep 16, 2008Mar 22, 2011Synergy Product Development, Inc.Back support for a seat
US7984948Jul 29, 2005Jul 26, 2011Schukra Of North America, Ltd.Modular contour support apparatus
US7984949Apr 24, 2008Jul 26, 2011Schukra Of North AmericaLumbar and bolster support for second row seat
US7997650Feb 23, 2009Aug 16, 2011Schukra Of North AmericaConstant pressure retreating lumbar system
US8382204Jul 22, 2011Feb 26, 2013Schukra of North America Co.Modular contour support apparatus
US8449037Apr 11, 2011May 28, 2013Herman Miller, Inc.Seating structure with a contoured flexible backrest
US8544953Nov 19, 2010Oct 1, 2013L&P Swiss Holding AgLumbar support assembly and corresponding seat structure
US8740303 *Jun 22, 2012Jun 3, 2014Michael V. HallidayCustomizable chair with multipoint adjustment
US9254042Jun 2, 2014Feb 9, 2016Michael V. HallidayBackrest member including an adjustable platform for use with a chair
US9301615Nov 25, 2014Apr 5, 2016Herman Miller, Inc.Seating structure with a contoured flexible backrest
US20040075320 *Sep 22, 2003Apr 22, 2004Schukra Geratebau AgDevice for adjusting a flexible support element of a backrest
US20040140700 *Jan 22, 2003Jul 22, 2004Mcmillen Robert J.Fold down seat lumbar support apparatus and method
US20040140705 *Feb 9, 2004Jul 22, 2004L & P Property Management CompanyAutomatically actuating ergonomic support system for a fold down seat
US20040155501 *Feb 10, 2003Aug 12, 2004Mcmillen Robert J.Fold down seat lumbar support apparatus and method
US20040245824 *Sep 15, 2003Dec 9, 2004L & P Property Management CompanyApparatus and method for lumbar support with variable apex
US20050035637 *Sep 20, 2004Feb 17, 2005Mcmillen Robert JamesUniversal ergonomic support with self-contained actuator
US20050121958 *Jun 10, 2004Jun 9, 2005Tom EdwardsChair with adjustable lumbar support
US20060267382 *May 18, 2006Nov 30, 2006Schukra Of North AmericaArm rest return
US20070236039 *Jan 25, 2005Oct 11, 2007L8 P Property Management CompanyDrive Mechanism
US20080284232 *Dec 21, 2005Nov 20, 2008L&P Swiss Holding CompanyCoupling Unit and Adjusting Mechanism Using the Coupling Unit
US20090096263 *Sep 26, 2005Apr 16, 2009L&P Swiss Holding CompanyLumbar Support Assembly and Corresponding Seat Structure
US20090236887 *Sep 16, 2008Sep 24, 2009Shunjie LuBack support for a seat
USD637423Apr 13, 2010May 10, 2011Herman Miller, Inc.Chair
USD639091Apr 13, 2010Jun 7, 2011Herman Miller, Inc.Backrest
USD650206Apr 13, 2010Dec 13, 2011Herman Miller, Inc.Chair
USD652657Apr 13, 2010Jan 24, 2012Herman Miller, Inc.Chair
USD653061Apr 13, 2010Jan 31, 2012Herman Miller, Inc.Chair
USD657166Apr 13, 2010Apr 10, 2012Herman Miller, Inc.Chair
USD769028Mar 3, 2015Oct 18, 2016Claire LittleBack support
DE1169625B *Jun 11, 1958May 6, 1964Alvar BarvaeusRueckenlehne mit geformter Flaeche aus elastisch biegsamen Laengsteilen fuer Sitzmoebel od. dgl.
DE1221772B *Apr 13, 1960Jul 28, 1966Dr Otto Alfred BeckerSitzmoebel
DE2733744A1 *Jul 27, 1977Feb 15, 1979Hans WienerFixed or movable seat or bed backrest with adjustable curvature - has movable horizontal spacer between base plate and resilient support (SW 14.11.77)
DE2736550A1 *Aug 13, 1977Feb 22, 1979Grammer Willibald FaVorrichtung zur verstellung der neigung des sitzpolsters bei einem fahrersitz, buerostuhl, drehsessel o.dgl.
DE3045809A1 *Dec 5, 1980Jul 8, 1982Grammer Willibald FaSitz mit bandscheibenstuetze
DE3324655A1 *Jul 8, 1983Jan 24, 1985Grammer Willibald FaSitz mit bandscheibenstuetze
DE4211094C1 *Apr 3, 1992Jun 3, 1993Grammer Ag, 8450 Amberg, DeBackrest support for vehicle seat - has flexible support plate over U=channel with two sets of shoulders braced on slidable wedge
EP0006840A1 *Jun 20, 1979Jan 9, 1980Wilhelm Ing. SchusterFlexible elastic support
EP0153390A1 *Aug 14, 1984Sep 4, 1985Robin MorgensternLumbosacral backrest with adjustable contour.
EP0153390A4 *Aug 14, 1984Jan 28, 1986Robin MorgensternLumbosacral backrest with adjustable contour.
EP0291298A1 *May 11, 1988Nov 17, 1988Joseph Mary JacobsenMeasuring apparatus
EP0698360A1Aug 1, 1995Feb 28, 1996Austro Investment S.A.Adjustable anatomical support, particularly lumbar support
WO1995004488A1 *Aug 5, 1994Feb 16, 1995Bosaro Biotech Inc.Adjustable backrest
WO2000041596A1 *Jan 11, 2000Jul 20, 2000Steelcase Inc.Chair having adjustable lumbar support
Classifications
U.S. Classification297/284.7, 297/284.8
International ClassificationA47C7/46, B60N2/70
Cooperative ClassificationB60N2/7029, A47C7/462
European ClassificationA47C7/46A, B60N2/70W2