US2756809A - Back support for chairs, car seats, and the like - Google Patents

Back support for chairs, car seats, and the like Download PDF

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Publication number
US2756809A
US2756809A US44051754A US2756809A US 2756809 A US2756809 A US 2756809A US 44051754 A US44051754 A US 44051754A US 2756809 A US2756809 A US 2756809A
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plate
back
chairs
back support
convex
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Endresen Ernst
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Endresen Ernst
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60NSEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00Seats specially adapted for vehicles
    • B60N2/70Upholstery springs ; Upholstery
    • B60N2/7023Coach-like constructions
    • B60N2/7029Coach-like constructions back-rests
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C7/00Parts, details, or accessories of chairs or stools
    • A47C7/36Support for the head or the back
    • A47C7/40Support for the head or the back for the back
    • A47C7/46Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
    • A47C7/462Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs adjustable by mechanical means

Description

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

US2756809A 1954-06-30 1954-06-30 Back support for chairs, car seats, and the like Expired - Lifetime US2756809A (en)

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Cited By (80)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2843195A (en) * 1956-01-25 1958-07-15 Alvar E A Barvaeus Self-adjusting back support
US2894565A (en) * 1957-05-17 1959-07-14 Hubert R Crane Contouring back rest for motor vehicle seats
US3106423A (en) * 1960-11-21 1963-10-08 Schwarz Johann Back rest having an adjustable shaped element
US3124389A (en) * 1964-03-10 mi kan
DE1169625B (en) * 1958-06-11 1964-05-06 Alvar Barvaeus Backrest with shaped surface made of resiliently flexible Laengsteilen for SITZMOEBEL od. Like.
US3258259A (en) * 1964-07-14 1966-06-28 Volvo Ab Seat backrest with tensioning means
DE1221772B (en) * 1960-04-13 1966-07-28 Dr Otto Alfred Becker SITZMOEBEL
US3463544A (en) * 1968-04-22 1969-08-26 Edward Froelich Orthopedic seat back
US3464754A (en) * 1967-01-17 1969-09-02 Rex Stroll O Chair Co Orthopedic chair
US3880463A (en) * 1972-02-02 1975-04-29 Ipeco Europe Ltd Seat with back support
DE2733744A1 (en) * 1976-04-21 1979-02-15 Hans Wiener Fixed or movable seat or bed backrest with adjustable curvature - has movable horizontal spacer between base plate and resilient support (SW 14.11.77)
DE2736550A1 (en) * 1977-08-13 1979-02-22 Grammer Willibald Fa Device for adjusting the inclination of the seat cushion or the like at a driver's seat, office chair, swivel chairs.
EP0006840A1 (en) * 1978-06-23 1980-01-09 Wilhelm Ing. Schuster Flexible elastic support
US4313637A (en) * 1978-11-18 1982-02-02 Uop Inc. Seat having a movable lumbar support
US4316631A (en) * 1979-01-24 1982-02-23 Steyr-Daimler-Puch Aktiengesellschaft Backrest
DE3045809A1 (en) * 1980-12-05 1982-07-08 Grammer Willibald Fa Seat with bandscheibenstuetze
US4339150A (en) * 1980-05-05 1982-07-13 Gmsr Ortho Enterprises, Inc. Back support construction
DE3324655A1 (en) * 1983-07-08 1985-01-24 Grammer Willibald Fa Seat with bandscheibenstuetze
US4520800A (en) * 1983-05-09 1985-06-04 Standex International Corporation Patient treatment table
EP0153390A1 (en) * 1983-08-15 1985-09-04 Robin Morgenstern Lumbosacral backrest with adjustable contour.
US4634178A (en) * 1984-12-10 1987-01-06 Carney Steven H Adaptable seating device
EP0291298A1 (en) * 1987-05-13 1988-11-17 Joseph Mary Jacobsen Measuring apparatus
US4915447A (en) * 1989-03-13 1990-04-10 Sears Manufacturing Company Vehicle seat with adjustable thigh support
DE4211094C1 (en) * 1992-04-03 1993-06-03 Grammer Ag, 8450 Amberg, De Backrest support for vehicle seat - has flexible support plate over U=channel with two sets of shoulders braced on slidable wedge
US5217278A (en) * 1991-03-13 1993-06-08 Findlay Industries, Inc. Mechanism for providing adjustable lumbar support in a seat
US5344211A (en) * 1993-08-05 1994-09-06 Riyaz Adat Adjustable backrest
US5385531A (en) * 1992-07-08 1995-01-31 Eurokeyton S.A. Massage robot for relaxation armchair
US5474358A (en) * 1992-04-29 1995-12-12 Youngflex S.A. Seat arrangements providing adjustable lumbar support
EP0698360A1 (en) 1994-08-10 1996-02-28 Austro Investment S.A. Adjustable anatomical support, particularly lumbar support
US5609394A (en) * 1996-02-23 1997-03-11 Ligon Brothers Manufacturing Company Four-way lumbar support
US5641205A (en) * 1995-02-17 1997-06-24 R. Schmidt Gmbh Apparatus for adjusting the distribution of pressure in a vehicle seat backrest
US5651583A (en) * 1992-09-29 1997-07-29 Ameu Management Corp. Seat back rest with an adjustment device for a flexible arching element for adjusting the convex curvature of the back rest
US5791733A (en) * 1996-02-09 1998-08-11 Knoll, Inc. Adjustable lumbar support
US6062649A (en) * 1998-03-03 2000-05-16 Steelcase Development Inc. Chair back construction
US6079785A (en) * 1999-01-12 2000-06-27 Steelcase Development Inc. Chair having adjustable lumbar support
US6126237A (en) * 1998-04-06 2000-10-03 Ritterhouse; Keith I. Adjustable cushioned headrest
US6189972B1 (en) * 1998-06-05 2001-02-20 Teknion Furniture Systems Inc. Lumbar support adjustment mechanism
US6394546B1 (en) 1997-10-24 2002-05-28 Steelcase Development Corporation Lumbar device
US6419318B1 (en) 2000-04-11 2002-07-16 United Chair Company, Inc. Chair having an adjustable lumbar mechanism
US6471294B1 (en) 1999-04-19 2002-10-29 Steelcase Development Corporation Adjustable lumbar support
US6619739B2 (en) 2001-03-01 2003-09-16 L & P Property Management Company Universal ergonomic support with self-contained actuator
US6623076B2 (en) 1993-06-17 2003-09-23 Schukra-Gerätebau AG Adjustment apparatus for a resiliently flexible support element of a back rest
US6652028B2 (en) 2001-11-02 2003-11-25 L & P Property Management Apparatus and method for lumbar support with variable apex
US6652029B2 (en) 2001-12-20 2003-11-25 L & P Property Management Company Unitized back plate and lumbar support
US6666511B2 (en) 1989-08-04 2003-12-23 Schukra Geratebau Ag Arching mechanism and method of use
US6676214B2 (en) 2001-11-16 2004-01-13 L & P Property Management Company Method and apparatus for lumbar support with integrated actuator housing
US6758522B2 (en) 2001-03-29 2004-07-06 L&P Property Management Company Apparatus and method for varying coefficients of friction in a variable apex back support
US20040140700A1 (en) * 2003-01-22 2004-07-22 Mcmillen Robert J. Fold down seat lumbar support apparatus and method
US20040140705A1 (en) * 2003-01-22 2004-07-22 L & P Property Management Company Automatically actuating ergonomic support system for a fold down seat
US20040155501A1 (en) * 2003-01-22 2004-08-12 Mcmillen Robert J. Fold down seat lumbar support apparatus and method
US6779844B2 (en) 2001-12-14 2004-08-24 L&P Propety Maqnagement Company Arching lumbar support with weight distribution surface
US20050121958A1 (en) * 2003-11-21 2005-06-09 Tom Edwards Chair with adjustable lumbar support
US6908153B2 (en) 2002-12-02 2005-06-21 L&P Property Management Company Power lumbar support cable apparatus and method
US6908152B2 (en) 2001-12-14 2005-06-21 L & P Property Management Company Push lumbar support with flexible pressure surface
US6938955B2 (en) 2001-10-11 2005-09-06 L&P Property Management Co. Power lumbar mechanism
US7052087B2 (en) 2002-12-09 2006-05-30 L&P Property Management Company Method and apparatus for a scissors ergonomic support
US20060267382A1 (en) * 2005-05-18 2006-11-30 Schukra Of North America Arm rest return
US7237848B1 (en) * 2004-09-03 2007-07-03 Douglas Story Back and internal organ supportive belt
US20070236039A1 (en) * 2004-02-06 2007-10-11 L8 P Property Management Company Drive Mechanism
US20080284232A1 (en) * 2005-01-12 2008-11-20 L&P Swiss Holding Company Coupling Unit and Adjusting Mechanism Using the Coupling Unit
US7490899B2 (en) 2006-03-30 2009-02-17 Schukra Of North America Combination lumbar-bolster system
US20090096263A1 (en) * 2005-01-12 2009-04-16 L&P Swiss Holding Company Lumbar Support Assembly and Corresponding Seat Structure
US20090236887A1 (en) * 2007-09-18 2009-09-24 Shunjie Lu Back support for a seat
US7614696B2 (en) 2006-12-11 2009-11-10 Schukra Of North America Lumbar system for climate seating
US7841666B2 (en) 2002-02-13 2010-11-30 Herman Miller, Inc. Back support structure
US7878590B1 (en) * 2006-12-22 2011-02-01 B&B Innovators, Llc Vertebral column support for mesh back chairs
USD637423S1 (en) 2010-04-13 2011-05-10 Herman Miller, Inc. Chair
USD639091S1 (en) 2010-04-13 2011-06-07 Herman Miller, Inc. Backrest
US7984948B2 (en) 2004-07-30 2011-07-26 Schukra Of North America, Ltd. Modular contour support apparatus
US7984949B2 (en) 2007-04-24 2011-07-26 Schukra Of North America Lumbar and bolster support for second row seat
US7997650B2 (en) 2008-02-22 2011-08-16 Schukra Of North America Constant pressure retreating lumbar system
USD650206S1 (en) 2010-04-13 2011-12-13 Herman Miller, Inc. Chair
USD652657S1 (en) 2010-04-13 2012-01-24 Herman Miller, Inc. Chair
USD653061S1 (en) 2010-04-13 2012-01-31 Herman Miller, Inc. Chair
USD657166S1 (en) 2010-04-13 2012-04-10 Herman Miller, Inc. Chair
US8449037B2 (en) 2010-04-13 2013-05-28 Herman Miller, Inc. Seating structure with a contoured flexible backrest
US8740303B2 (en) * 2012-06-22 2014-06-03 Michael V. Halliday Customizable chair with multipoint adjustment
US9254042B2 (en) 2012-06-22 2016-02-09 Michael V. Halliday Backrest member including an adjustable platform for use with a chair
USD769028S1 (en) 2015-03-03 2016-10-18 Claire Little Back support
US20170231397A1 (en) * 2014-10-13 2017-08-17 Haworth, Inc. Lumbar support for a chair, and chair having same

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GB189902598A (en) * 1899-02-06 1900-02-06 Jennie Frew West Improvements in Back Rests for Chairs and other Seats.
US958356A (en) * 1909-11-01 1910-05-17 Philipp Gustav August Bode Upholstered chair.
US1264265A (en) * 1917-08-10 1918-04-30 Herbert Brusius Adjustable chair-back.
US1677584A (en) * 1927-06-30 1928-07-17 Gen Motors Corp Adjustable seat structure for automobiles
US1937920A (en) * 1931-05-18 1933-12-05 Smith Harry Elmer Pad for chair and seat backs
US2359318A (en) * 1941-06-12 1944-10-03 Walter E Lay Spring construction and method of assembling
US2549902A (en) * 1945-10-02 1951-04-24 Donald L Hibbard Seat
US2550831A (en) * 1949-07-01 1951-05-01 Robert E Lingenfelter Adjustable means for changing the contour of seat back rests

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB189902598A (en) * 1899-02-06 1900-02-06 Jennie Frew West Improvements in Back Rests for Chairs and other Seats.
US958356A (en) * 1909-11-01 1910-05-17 Philipp Gustav August Bode Upholstered chair.
US1264265A (en) * 1917-08-10 1918-04-30 Herbert Brusius Adjustable chair-back.
US1677584A (en) * 1927-06-30 1928-07-17 Gen Motors Corp Adjustable seat structure for automobiles
US1937920A (en) * 1931-05-18 1933-12-05 Smith Harry Elmer Pad for chair and seat backs
US2359318A (en) * 1941-06-12 1944-10-03 Walter E Lay Spring construction and method of assembling
US2549902A (en) * 1945-10-02 1951-04-24 Donald L Hibbard Seat
US2550831A (en) * 1949-07-01 1951-05-01 Robert E Lingenfelter Adjustable means for changing the contour of seat back rests

Cited By (110)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124389A (en) * 1964-03-10 mi kan
US2843195A (en) * 1956-01-25 1958-07-15 Alvar E A Barvaeus Self-adjusting back support
US2894565A (en) * 1957-05-17 1959-07-14 Hubert R Crane Contouring back rest for motor vehicle seats
DE1169625B (en) * 1958-06-11 1964-05-06 Alvar Barvaeus Backrest with shaped surface made of resiliently flexible Laengsteilen for SITZMOEBEL od. Like.
DE1221772B (en) * 1960-04-13 1966-07-28 Dr Otto Alfred Becker SITZMOEBEL
US3106423A (en) * 1960-11-21 1963-10-08 Schwarz Johann Back rest having an adjustable shaped element
US3258259A (en) * 1964-07-14 1966-06-28 Volvo Ab Seat backrest with tensioning means
US3596990A (en) * 1967-01-17 1971-08-03 Louis Gottfried Orthopedic chair
US3464754A (en) * 1967-01-17 1969-09-02 Rex Stroll O Chair Co Orthopedic chair
US3463544A (en) * 1968-04-22 1969-08-26 Edward Froelich Orthopedic seat back
US3880463A (en) * 1972-02-02 1975-04-29 Ipeco Europe Ltd Seat with back support
DE2733744A1 (en) * 1976-04-21 1979-02-15 Hans Wiener Fixed or movable seat or bed backrest with adjustable curvature - has movable horizontal spacer between base plate and resilient support (SW 14.11.77)
US4350388A (en) * 1976-04-21 1982-09-21 Spina-Trac Ab Backrests
DE2736550A1 (en) * 1977-08-13 1979-02-22 Grammer Willibald Fa Device for adjusting the inclination of the seat cushion or the like at a driver's seat, office chair, swivel chairs.
US4153294A (en) * 1977-08-13 1979-05-08 Messrs. Willibald Grammer Apparatus for adjusting the inclination of seat upholstery in a driver's seat, office chair, revolving armchair or the like
US4452485A (en) * 1978-06-23 1984-06-05 Wilhelm Schuster Flexible elastic support
EP0006840A1 (en) * 1978-06-23 1980-01-09 Wilhelm Ing. Schuster Flexible elastic support
US4354709A (en) * 1978-06-23 1982-10-19 Wilhelm Schuster Flexible elastic support
US4313637A (en) * 1978-11-18 1982-02-02 Uop Inc. Seat having a movable lumbar support
US4316631A (en) * 1979-01-24 1982-02-23 Steyr-Daimler-Puch Aktiengesellschaft Backrest
US4339150A (en) * 1980-05-05 1982-07-13 Gmsr Ortho Enterprises, Inc. Back support construction
DE3045809A1 (en) * 1980-12-05 1982-07-08 Grammer Willibald Fa Seat with bandscheibenstuetze
US4520800A (en) * 1983-05-09 1985-06-04 Standex International Corporation Patient treatment table
DE3324655A1 (en) * 1983-07-08 1985-01-24 Grammer Willibald Fa Seat with bandscheibenstuetze
US4601514A (en) * 1983-07-08 1986-07-22 Messrs. Willibald Grammer Seat having an adjustable back support arrangement
EP0153390A1 (en) * 1983-08-15 1985-09-04 Robin Morgenstern Lumbosacral backrest with adjustable contour.
EP0153390A4 (en) * 1983-08-15 1986-01-28 Robin Morgenstern Lumbosacral backrest with adjustable contour.
US4634178A (en) * 1984-12-10 1987-01-06 Carney Steven H Adaptable seating device
EP0291298A1 (en) * 1987-05-13 1988-11-17 Joseph Mary Jacobsen Measuring apparatus
US4993164A (en) * 1987-05-13 1991-02-19 Jacobsen Joseph M Measuring device
US4915447A (en) * 1989-03-13 1990-04-10 Sears Manufacturing Company Vehicle seat with adjustable thigh support
US6666511B2 (en) 1989-08-04 2003-12-23 Schukra Geratebau Ag Arching mechanism and method of use
US5217278A (en) * 1991-03-13 1993-06-08 Findlay Industries, Inc. Mechanism for providing adjustable lumbar support in a seat
DE4211094C1 (en) * 1992-04-03 1993-06-03 Grammer Ag, 8450 Amberg, De Backrest support for vehicle seat - has flexible support plate over U=channel with two sets of shoulders braced on slidable wedge
US5474358A (en) * 1992-04-29 1995-12-12 Youngflex S.A. Seat arrangements providing adjustable lumbar support
US5385531A (en) * 1992-07-08 1995-01-31 Eurokeyton S.A. Massage robot for relaxation armchair
US5651583A (en) * 1992-09-29 1997-07-29 Ameu Management Corp. Seat back rest with an adjustment device for a flexible arching element for adjusting the convex curvature of the back rest
US6883867B2 (en) 1993-06-17 2005-04-26 Schukra Geratebau Ag Device for adjusting a flexible support element of a backrest
US20040075320A1 (en) * 1993-06-17 2004-04-22 Schukra Geratebau Ag Device for adjusting a flexible support element of a backrest
US6623076B2 (en) 1993-06-17 2003-09-23 Schukra-Gerätebau AG Adjustment apparatus for a resiliently flexible support element of a back rest
US5624158A (en) * 1993-08-05 1997-04-29 Bosaro Biotech Inc. Adjustable backrest
US5553917A (en) * 1993-08-05 1996-09-10 Bosaro Biotech Inc. Adjustable backrest
WO1995004488A1 (en) * 1993-08-05 1995-02-16 Bosaro Biotech Inc. Adjustable backrest
US5344211A (en) * 1993-08-05 1994-09-06 Riyaz Adat Adjustable backrest
EP0698360A1 (en) 1994-08-10 1996-02-28 Austro Investment S.A. Adjustable anatomical support, particularly lumbar support
US5641205A (en) * 1995-02-17 1997-06-24 R. Schmidt Gmbh Apparatus for adjusting the distribution of pressure in a vehicle seat backrest
US5791733A (en) * 1996-02-09 1998-08-11 Knoll, Inc. Adjustable lumbar support
US5609394A (en) * 1996-02-23 1997-03-11 Ligon Brothers Manufacturing Company Four-way lumbar support
US6394546B1 (en) 1997-10-24 2002-05-28 Steelcase Development Corporation Lumbar device
US6062649A (en) * 1998-03-03 2000-05-16 Steelcase Development Inc. Chair back construction
US6099076A (en) * 1998-03-03 2000-08-08 Steelcase Development Inc. Chair back construction
US6126237A (en) * 1998-04-06 2000-10-03 Ritterhouse; Keith I. Adjustable cushioned headrest
US6189972B1 (en) * 1998-06-05 2001-02-20 Teknion Furniture Systems Inc. Lumbar support adjustment mechanism
US6260921B1 (en) * 1998-06-05 2001-07-17 Teknion Furniture Systems, Inc. Lumbar support adjustment mechanism
WO2000041596A1 (en) * 1999-01-12 2000-07-20 Steelcase Inc. Chair having adjustable lumbar support
US6079785A (en) * 1999-01-12 2000-06-27 Steelcase Development Inc. Chair having adjustable lumbar support
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