US2843195A - Self-adjusting back support - Google Patents

Self-adjusting back support Download PDF

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US2843195A
US2843195A US56132556A US2843195A US 2843195 A US2843195 A US 2843195A US 56132556 A US56132556 A US 56132556A US 2843195 A US2843195 A US 2843195A
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strip
arch
member
backing
members
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Alvar E A Barvaeus
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Alvar E A Barvaeus
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    • 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

Description

y 5, 1958 A. E. A. BARVAEUS 2,843,195

SELF-ADJUSTING BACK SUPPORT Filed Jan. 25, 1956 Ve/7 for United States Patent 2,843,15 SELF-ADJUSTING BACK SUPPORT Alvar E. A. Barvaeus, Enskede, Sweden Application January 25', 1956, Serial'No. 561,325 4 Claims. (Cl. 155-182) This invention relates to an improved back support for seats of any kind, which back support may either be upholstered with e. g. foam latex or similar upholstery material or left uncovered.

The main object of my invention is to provide a seat back which is capable of automatically adjusting itself to the body of the user thereby giving a highly comfortable and at the same time anatomically correct support for the users back. Another object of the invention is to provide a seat back capable of forming a self-adjusting loin support automatically selecting a contour fitting the body of the user irrespectively of the size of the users body. A further object of the invention is to provide a back support capable of forming a translatory movable loin supporting arch having-a certain, preferably adjustable minimum amplitude and length.

My invention is based on the fact that a translatory movable arch may be obtained by attaching both the ends of a resilient strip-like member to a backing structure at points which lie closer to one another than the length of the strip-like member. It will be clear that a resilient strip-like member thus attached to the backing will form an arch between the two points and if the distance between the two points of attachment is only slightly shorter than the length of the strip-like member, the arch formed by the strip-like member will be low and extend substantially from the one attachment point to the other. A pressure exerted on the strip-like member in the direction towards the backing structure will then be able to press a certain length of the strip-like members into contact with backing structure thus reducing the length of the arch. At the same time the amplitude or peak-height of the arch will be slightly reduced but it will never be possible to reduce the length and the amplitude of the arch beyond a certain minimum value without breaking the strip-like member. This minimum arch will be capable of moving translatory over the front surface of the backing like a swell over the sea and the size of the said minimum arch may be selected by varying the distance between the two points of attachment in relation of the length of the strip-like member and also by varying the resiliency of the strip-like member.

Other objects and advantages of my novel construction will appear from the following description of various embodiments of my invention which have been illustrated on the accompanying drawing, wherein Fig. l is a perspective front view of an elementary form of my back support as used in a car seat,

Fig. 2 is a side elevation of a modified form of my construction,

Fig. 3 is a side elevation of a third embodiment of my invention and Fig. 4 is a side elevation of a further form of my back support adapted for use in a chair or seat having a back with adjustable inclination.

In all the different figures the same reference characters have been used to indicate similar parts or parts 2,843,195 Patented July 15, 1958 having similar function. Thus in all figures numeral 1 designates a rigid panel-like backing in front of which there are arranged a plurality of paralle'lly spaced vertically extending strip-like members} of steel, rattan or like materials. The strip-like members 2 have their ends lying close to or in the vicinity of the front surface of the backing structure 1 and the upper end of each resilient strip-like member 2 enters a small pocket in the underside of a molding strip 3 being rigidly secured to the front surface of the backing 1 nearthe top edge thereof so as to transverse the backing structure horizontally. The upper end of each strip-like member 2 thus abuts the molding strip 3 being thereby retained in a pre-determined position relatively to the backing structure 1. The lower end of each strip-like member 2 enters a similar pocket in the upper side of a lower transverse molding strip 4 which also exends substantially horizontally over the front surface of the backing structure so as to confine the lower end of each strip-like member 2 within a pre-determined distance from the upper end of the related strip-like member. The molding strips 3 and 4 are spaced apart vertically a distance which is slightly shorter than the actual length of each of the strip-like members and thusthe molding strips 3 and 4 will serve as abutments for the ends of the strip-like members causing said strip-like members to take the form of an arch or a bow between the confining abutments.

The arch or how thus formed by each strip-likemember 2 will have an amplitude or peak-height -in Figs. 2 and 4 indicated by numeral 5--which may be varied by adjusting the distance between the two horizontal moldingsor abutment strips 3 and 4. To allow for such adjustment I have provided in the back support shown in Fig. 3 screw-means 9 for displacing the lower molding strip 4 parallelly up and down a very small distance. It should be noted however that adjustment of the screwmeans 9 will change the maximum amplitude 5 of the arch formed by each strip-like member and not in any way influence the other properties of the back rest. A similar adjustment may be obtained in a chair having a back, the inclination of which may be adjusted at will, by forming the molding strip 4 like a slide movable up and down over the front surface of the backing plate 1 and being connected by a link 13 to the seat 7 of the chair in a manner to cause the molding strip 4 to move downwardly as the back rest is folded down backwardly.

Each strip-like member 2 thus caused to form a resilient arch over the front surface of the backing structure 1 will under the pressure of a human body leaning against it become partly pressed into contact with the front surface of the backing plate 1 by the shoulder and the hip portions of the user so that the arch formed by the strip will be reduced in length and this minimum arch will be capable of translatory movement up nad down over the front surface of the backing structure just like a swell is moving over a Water surface. Thus the minimum arch will always adjust itself to a position in which it fits the loin curvature of the body of the user. This translatory movement of the arch has been indicated at 5 and 5 in Figs. 2 and 3. To prevent the minimum arch from moving too far upwardly towards the upper molding strip 3 as a result of an uncontrolled pressure against the strip-like members 2, which movement may cause breaking of the strips or their disengagement fromthe upper molding strip 3, the upper portion of each strip-like member 2 is preferably connected to the backing structure 1 by a distance-maximating means in the form of a flexible tie 6 as shown in Fig. 2 or a rivet 6 or the like as shown in Figs. 3 and 4. To prevent the strip-like members 2 from forming a too steep arch at its lower portion stiffening means 8 may be arranged on the back of each strip-like member 2 as shown in Fig. 2.

In Fig. 4 numeral 11 designates a transverse strip of foam latex serving to initiate the formation of an arch from each strip-like member 2 when the distance between the two molding strips 3 and 4 is reduced as a result of the raising of the back from a horizontal to an inclined position. Similar means may of course be used in the structure shown in Fig. 3. In Fig. 3 there is also provided a small cushion 10 in the pocket of the lower molding strip 4 to make the arch formed by each resilient strip-like member 2 somewhat yielding. In all the embodiments shown numeral 12 designates a layer of foam latex or other upholstery material which may cover the front of the back support. The thickness and other properties of such covering may of course be varied as desired and in certain cases the strip-like members of the back support may be left fully uncovered.

It will be obvious to those skilled in the art that various changes may be made in my construction without departing from the spirit of the invention and therefore I do not wish to confine myself to the embodiments shown in the drawings and described in the foregoing specification.

I claim:

1. In a seat back the combination of a rigid, panellike backing, vertically spaced abutments protruding over the front surface of said backing, a plurality of parallelly spaced resilient strip-like members vertically arranged in front of said backing and having their end portions supported by said abutments, the length of each such striplike member exceeding the distance between the pair of related abutments, and said strip-like members hence being caused to form a resilient arch over a considerable vertical length of said backing, the ends of said arch being so located to said backing and the rise of said arch being so chosen with respect to the resiliency of said strip-like members that a moderate local pressure on each of said members will enable an intermediate point of said arched member to be brought into contact with said backing thereby reducing the span of the arch and hence make said reduced arch capable of translatory vertical motion over said backing.

2. In a seat back the combination as claimed in claim 1 wherein said strip-like members Within the upper half of their length are connected with the backing through distance-maximating means.

3. In a seat back the combination as claimed in claim 1, wherein said abutments are vertically adjustable relatively to said backing for adjustment of the rise of the arch formed by each of said strip-like members.

4. A self-adjusting back support for seats comprising in combination a rigid backing structure, a plurality of parallelly spaced resilient strip-like members extending over the front surface of said backing structure, both ends of each of said strip-like members lying close to the front surface of said backing structure, an abutment protruding over the front surface of said backing structure at each end of said strip-like member for preventing the 7 related end of the strip-like member from moving in the I structure.

References Cited in the file of this patent UNITED STATES PATENTS West Nov. 15, 1898 Endresen July 31, 1956

US2843195A 1956-01-25 1956-01-25 Self-adjusting back support Expired - Lifetime US2843195A (en)

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Cited By (91)

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US3086817A (en) * 1957-10-23 1963-04-23 Daimler Benz Ag Seat for a motor vehicle
US3106423A (en) * 1960-11-21 1963-10-08 Schwarz Johann Back rest having an adjustable shaped element
US3158400A (en) * 1962-12-10 1964-11-24 Eugene W Tuhtar Church pew
US3181912A (en) * 1963-07-10 1965-05-04 Nielsen Jens Georg Martinus Frame for upholstery in pieces of sitting furniture
US3233255A (en) * 1961-05-22 1966-02-08 Miller Herman Inc Bed construction
DE1221772B (en) * 1960-04-13 1966-07-28 Dr Otto Alfred Becker SITZMOEBEL
US3446531A (en) * 1967-09-14 1969-05-27 Edward Froelich Back support
US3813148A (en) * 1972-04-17 1974-05-28 H Kraus Adjustable 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)
US4153293A (en) * 1977-09-06 1979-05-08 Nepsco, Inc. Back rest
US4156544A (en) * 1978-03-20 1979-05-29 Milsco Manufacturing Company Vehicle seat having lumbar support adjustment means
US4316631A (en) * 1979-01-24 1982-02-23 Steyr-Daimler-Puch Aktiengesellschaft Backrest
US4354709A (en) * 1978-06-23 1982-10-19 Wilhelm Schuster Flexible elastic support
US4502728A (en) * 1982-10-08 1985-03-05 Nepsco, Inc. Portable seat and back rest
US4541670A (en) * 1983-08-15 1985-09-17 Robin Morgenstern Lumbosacral backrest with adjustable contour
US4790496A (en) * 1987-07-31 1988-12-13 The Jepson Burns Corporation Aircraft seat with flexible lumbar panel
EP0312506A1 (en) * 1987-10-16 1989-04-19 FIAT AUTO S.p.A. An adjustable backrest for the seats of vehicles, particularly cars
US4880271A (en) * 1987-12-28 1989-11-14 Wickes Manufacturing Company Adjustable lumbar support
US5054845A (en) * 1990-02-21 1991-10-08 Ignaz Vogel Gmbh & Co. Kg Fahrzeugsitze Passenger seat having yielding band structure
US5316375A (en) * 1991-12-16 1994-05-31 Buddy Orthopoedic Inc. Back support and internal frame
US5344211A (en) * 1993-08-05 1994-09-06 Riyaz Adat Adjustable backrest
US5609394A (en) * 1996-02-23 1997-03-11 Ligon Brothers Manufacturing Company Four-way lumbar support
US5651584A (en) * 1995-04-24 1997-07-29 L & P Property Management Company Lumbar support structure for automotive vehicle
WO1998032630A1 (en) * 1997-01-23 1998-07-30 Lear Corporation Pneumatic energy absorbing seat assembly
US6126237A (en) * 1998-04-06 2000-10-03 Ritterhouse; Keith I. Adjustable cushioned headrest
US6309018B1 (en) * 1996-09-09 2001-10-30 Volvo Car Corporation Back support structure for a seat
WO2001097655A2 (en) * 2000-06-20 2001-12-27 Global Total Office Conformable backrest for a chair
WO2001097656A3 (en) * 2000-06-20 2002-05-16 Global Total Office Backrest with 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
US6652029B2 (en) 2001-12-20 2003-11-25 L & P Property Management Company Unitized back plate and lumbar support
US6652028B2 (en) 2001-11-02 2003-11-25 L & P Property Management Apparatus and method for lumbar support with variable apex
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
US20050006939A1 (en) * 2002-02-12 2005-01-13 Hancock Robert L. Vehicle seat having an electronic control system
US6908152B2 (en) 2001-12-14 2005-06-21 L & P Property Management Company Push lumbar support with flexible pressure surface
US6908153B2 (en) 2002-12-02 2005-06-21 L&P Property Management Company Power lumbar support cable apparatus and method
US20050179290A1 (en) * 2002-02-12 2005-08-18 Johnson Controls Technology Company Automotive seat with active back
US20050184200A1 (en) * 2004-02-19 2005-08-25 Jorg Schwarzbich Lordosis support
US6938955B2 (en) 2001-10-11 2005-09-06 L&P Property Management Co. Power lumbar mechanism
US20050242652A1 (en) * 2002-05-15 2005-11-03 Kepler Brian D Adjustable attachment and tensioning assembly for the suspension of a seat assembly
US7052087B2 (en) 2002-12-09 2006-05-30 L&P Property Management Company Method and apparatus for a scissors ergonomic support
US20060255646A1 (en) * 2005-04-08 2006-11-16 Banyan Licensing Lc Portable support cushion
US20060267382A1 (en) * 2005-05-18 2006-11-30 Schukra Of North America Arm rest return
US20060273644A1 (en) * 2005-05-18 2006-12-07 Alan Sturt Vehicle seat assembly having movable bolsters
US20070108816A1 (en) * 2005-11-17 2007-05-17 Lear Corporation Self adjusting seatback system
US20070132296A1 (en) * 2005-12-14 2007-06-14 Lear Corporation Automatic lumbar support system for a folding seat system
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
US7458637B2 (en) * 2004-06-10 2008-12-02 Steelcase Inc. Back construction with flexible lumbar
US20080296945A1 (en) * 2007-06-01 2008-12-04 Bedford Adam C Seating unit with adjustable lumbar device
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
US7614696B2 (en) 2006-12-11 2009-11-10 Schukra Of North America Lumbar system for climate seating
US20100117420A1 (en) * 2007-03-06 2010-05-13 Johnson Controls Gmbh Vehicle seat
US7841666B2 (en) 2002-02-13 2010-11-30 Herman Miller, Inc. Back support structure
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USD637423S1 (en) 2010-04-13 2011-05-10 Herman Miller, Inc. Chair
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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
US20110298255A1 (en) * 2010-06-08 2011-12-08 Brenda Brotsch Spinal Supporting Chair Attachment
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
USD662733S1 (en) 2011-12-16 2012-07-03 Kimball International, Inc. Lounge end
US8272693B2 (en) 2008-05-02 2012-09-25 Haworth, Inc. Tension mechanism for a weight-responsive chair
USD668892S1 (en) 2011-12-16 2012-10-16 Kimball International, Inc. Lounge end
USD671333S1 (en) 2011-12-16 2012-11-27 Kimball International, Inc. Lounge corner unit
USD680347S1 (en) 2011-12-16 2013-04-23 Kimball International, Inc. Lounge
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USD695038S1 (en) 2011-12-16 2013-12-10 Kimball International, Inc. Lounge
USD696055S1 (en) * 2008-05-26 2013-12-24 Steelcase, Inc. Chair back
USD696545S1 (en) * 2013-07-30 2013-12-31 Steelcase, Inc. Rear surface of a chair back
US20140084653A1 (en) * 2012-09-21 2014-03-27 Marcelo Mezzera Chair having a dynamically-flexible back and seat
US20150102647A1 (en) * 2013-10-10 2015-04-16 James E. Grove Dynamic lumbar support for a chair
USD728983S1 (en) 2014-05-23 2015-05-12 Kimball International, Inc. Lounge end
USD728947S1 (en) 2014-05-23 2015-05-12 Kimball International, Inc. Lounge with table
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Cited By (136)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3086817A (en) * 1957-10-23 1963-04-23 Daimler Benz Ag Seat for a motor vehicle
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
US3233255A (en) * 1961-05-22 1966-02-08 Miller Herman Inc Bed construction
US3158400A (en) * 1962-12-10 1964-11-24 Eugene W Tuhtar Church pew
US3181912A (en) * 1963-07-10 1965-05-04 Nielsen Jens Georg Martinus Frame for upholstery in pieces of sitting furniture
US3446531A (en) * 1967-09-14 1969-05-27 Edward Froelich Back support
US3813148A (en) * 1972-04-17 1974-05-28 H Kraus Adjustable back support
US4350388A (en) * 1976-04-21 1982-09-21 Spina-Trac Ab Backrests
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)
US4153293A (en) * 1977-09-06 1979-05-08 Nepsco, Inc. Back rest
US4156544A (en) * 1978-03-20 1979-05-29 Milsco Manufacturing Company Vehicle seat having lumbar support adjustment means
US4354709A (en) * 1978-06-23 1982-10-19 Wilhelm Schuster Flexible elastic support
US4452485A (en) * 1978-06-23 1984-06-05 Wilhelm Schuster Flexible elastic support
US4316631A (en) * 1979-01-24 1982-02-23 Steyr-Daimler-Puch Aktiengesellschaft Backrest
US4502728A (en) * 1982-10-08 1985-03-05 Nepsco, Inc. Portable seat and back rest
US4541670A (en) * 1983-08-15 1985-09-17 Robin Morgenstern Lumbosacral backrest with adjustable contour
US4790496A (en) * 1987-07-31 1988-12-13 The Jepson Burns Corporation Aircraft seat with flexible lumbar panel
EP0312506A1 (en) * 1987-10-16 1989-04-19 FIAT AUTO S.p.A. An adjustable backrest for the seats of vehicles, particularly cars
US4909568A (en) * 1987-10-16 1990-03-20 Fiat Auto S.P.A. Adjustable backrest for the seats of vehicles, particularly cars
US4968093A (en) * 1987-10-16 1990-11-06 Fiat Auto S.P.A. Adjustable backrest for the seats of vehicles, particularly cars
US4880271A (en) * 1987-12-28 1989-11-14 Wickes Manufacturing Company Adjustable lumbar support
US20050040687A1 (en) * 1989-08-04 2005-02-24 Schukra Geratebau Ag Arching mechanism and method of use
US6666511B2 (en) 1989-08-04 2003-12-23 Schukra Geratebau Ag Arching mechanism and method of use
US20040066071A1 (en) * 1989-08-04 2004-04-08 Schukra Geratebau Ag Arching mechanism and method of use
US6860559B2 (en) * 1989-08-04 2005-03-01 L & P Property Management Company Arching mechanism and method of use
US7083231B2 (en) * 1989-08-04 2006-08-01 L & Property Management Company Arching mechanism and method of use
US5054845A (en) * 1990-02-21 1991-10-08 Ignaz Vogel Gmbh & Co. Kg Fahrzeugsitze Passenger seat having yielding band structure
US5316375A (en) * 1991-12-16 1994-05-31 Buddy Orthopoedic Inc. Back support and internal frame
US20040075320A1 (en) * 1993-06-17 2004-04-22 Schukra Geratebau Ag Device for adjusting a flexible support element of a backrest
US6883867B2 (en) 1993-06-17 2005-04-26 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
US5344211A (en) * 1993-08-05 1994-09-06 Riyaz Adat Adjustable backrest
US5651584A (en) * 1995-04-24 1997-07-29 L & P Property Management Company Lumbar support structure for automotive vehicle
US5609394A (en) * 1996-02-23 1997-03-11 Ligon Brothers Manufacturing Company Four-way lumbar support
US6309018B1 (en) * 1996-09-09 2001-10-30 Volvo Car Corporation Back support structure for a seat
US5826937A (en) * 1997-01-23 1998-10-27 Lear Corporation Pneumatic energy absorbing seat assembly
WO1998032630A1 (en) * 1997-01-23 1998-07-30 Lear Corporation Pneumatic energy absorbing seat assembly
US6126237A (en) * 1998-04-06 2000-10-03 Ritterhouse; Keith I. Adjustable cushioned headrest
WO2001097656A3 (en) * 2000-06-20 2002-05-16 Global Total Office Backrest with adjustable lumbar support
US6755467B1 (en) 2000-06-20 2004-06-29 Global Total Office Conformable backrest for a chair
US6688687B2 (en) 2000-06-20 2004-02-10 Global Total Office Backrest with adjustable lumbar support
WO2001097655A3 (en) * 2000-06-20 2002-05-02 Global Total Office Conformable backrest for a chair
WO2001097655A2 (en) * 2000-06-20 2001-12-27 Global Total Office Conformable backrest for a chair
US6619739B2 (en) 2001-03-01 2003-09-16 L & P Property Management Company Universal ergonomic support with self-contained actuator
US7077476B2 (en) 2001-03-01 2006-07-18 L&P Property Management Company Universal ergonomic support with self-contained actuator
US20050035637A1 (en) * 2001-03-01 2005-02-17 Mcmillen Robert James Universal ergonomic support with self-contained actuator
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
US6938955B2 (en) 2001-10-11 2005-09-06 L&P Property Management Co. Power lumbar mechanism
US20040245824A1 (en) * 2001-11-02 2004-12-09 L & P Property Management Company Apparatus and method for lumbar support with variable apex
US6652028B2 (en) 2001-11-02 2003-11-25 L & P Property Management Apparatus and method for lumbar support with variable apex
US6676214B2 (en) 2001-11-16 2004-01-13 L & P Property Management Company Method and apparatus for lumbar support with integrated actuator housing
US6908152B2 (en) 2001-12-14 2005-06-21 L & P Property Management Company Push lumbar support with flexible pressure surface
US6779844B2 (en) 2001-12-14 2004-08-24 L&P Propety Maqnagement Company Arching lumbar support with weight distribution surface
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