Class 297/291 - Spring centers back on pivot

Subclass of Class 297 - Chairs and seats
Definition: Device wherein the back swings or turns about an axis and
No. of patents: 39
Last issue date: 02/17/2009

Number	Title	Issue Date
7490901	Back rest for a chair A back rest for a chair with a back support and a back surface secured to the back support and able to swivel about a two-axis joint. The joint has a joint plate connected to the back surface, an element made of an elastic material that supports the joint in a groun...	02/17/2009
7427107	Movable backrest for a chair A movable backrest for a chair comprises a frame that is fixed to the chair, at least a flexible connecting element connected to the frame, and at least a backrest connected to the connecting element. Since the connecting element is flexible, the backrest and the ba...	09/23/2008
7422287	Seating with shape-changing back support frame A back includes an integrated articulating back frame and a back support. The back frame has a lower segment pivoted to a chair control, an upper segment for thoracic support, and links forming a four-bar linkage with the upper and lower segments, with a joint being...	09/09/2008
7416252	Backpost unit of wooden dining chair with reclining mechanism A backpost for use in wooden dining chair. The backpost unit provides reclining movements for a wooden chair of the type having a stationary frame section within which the backpost unit is secured. The backpost unit consists of an interlocking mechanism with minimum...	08/26/2008
7338125	Rehabilitative and recreational armchair The rehabilitative and recreational armchair constructed of a framework made of tubes, bars and/or other elements, such as flat bars and angle bars, wherein the arms, the backrest and the seat are mounted. The seat is mounted only to the top of the spring whose lowe...	03/04/2008
7278688	Elastic support structure for a human body to lean against The elastic support structure for human body to lean against includes a connecting frame, a swing rack, and an elastic rod. The connecting frame includes a connecting surface and a positioning part for the support structure. The swing rack has its first end placed o...	10/09/2007
7249801	Cushioning device to cushion the backrest of a chair, an armchair, an office chair or similar Cushioning device to cushion a backrest with respect to the seat of a chair or suchlike. The device comprises a first supporting element connected to the backrest, a second supporting element connected to the seat and pinned to the first supporting element, and a sp...	07/31/2007
7234774	Seating unit with novel flexible supports A seating unit includes a seat, a back, a base, and a motion control having a plurality of flexible supports for operably supporting the seat and back on the base. The flexible supports are movable in a generally fore-to-aft direction but stiff in a generally vertic...	06/26/2007
7226127	Ergonomic chair backrest A “task” chair intended primarily for a person working at a computer terminal has a back provided with a pair of upright struts that incorporate respective parallelogram linkages operative to increase the curvature of the lumbar region of the seat back while at ...	06/05/2007
7156459	Stackable chair A stackable chair has a backrest mounted on back supports by resilient mount units for tilting between an upright position and a tilted-back position. Each mount unit includes a rigid coupling member having a lower portion received within an upper end portion of the...	01/02/2007
7118177	Chair with tiltable backrest A chair comprising a support structure bearing a seat and a backrest, in which the backrest comprises a bearing portion and a connecting portion for connection to the support structure, in which the backrest is tiltable rearwards relative to a resting position under...	10/10/2006
7114777	Chair having reclineable back and movable seat A seating unit includes a seating unit having a base, a seat and a back operably pivoted to the base for synchronous movement including recline of the back and forward movement of the seat, an adjustable variable back stop adjustably engaging the seat for adjustably...	10/03/2006
7063384	Flexible chair back A flexible chair back provides a preferred elastic effect than conventional plastic chair backs, which comprises a back supporting board having a flexible member integrally extended from the back supporting board, a rear board and a spring sandwiched by the back sup...	06/20/2006
7048247	Support leg device for equipment case A support leg for an equipment case is made of a support leg main body and a stand base. The main body defines a concave (recessed) portion in the bottom thereof. A spire head portion that defines a spike is disposed in the concave portion so the spike does not exte...	05/23/2006
7040709	Back construction for seating unit having inverted U-shaped frame A back construction includes an inverted U-shaped back frame and a back shell supported on the back frame and having stiff thoracic and pelvic regions connected by a flexible lumbar region in a manner adapted to ergonomically support a seated user. The lumber sectio...	05/09/2006
7021712	Chair with flexible, resilient back support A chair with a flexible resilient back support structure includes a hollow tubular seat frame, a hollow tubular backrest frame pivotally connected to the seat frame, and a limit stop affixed to the backrest frame or the seat frame adjacent to the pivot points. The l...	04/04/2006
7021706	Vehicle seat with protection from shock loads A vehicle seat comprising a rigid support structure provided with a rear central beam, which structure carries a headrest, a seat proper, and a seat back carried by the central beam. The seat back is pivotally mounted on the central beam via two couplings that enabl...	04/04/2006
6935690	Chair with synchronously moving seat and seat back A chair having a synchronously moving seat bottom and seat back includes a frame having a seat bottom support portion and a seatback support portion and a seat assembly having a seat bottom and a seat back interconnected by a flexible intermediate portion. The seat ...	08/30/2005
6932431	Chair having novel tilt control mechanism A chair having a chair seat and a chair back includes a means for controlling the tilt of the chair back relative to the chair seat, the tilt means comprising a control body mounted beneath the chair seat and a pivot body pivotably mounted beneath the control body. ...	08/23/2005
6631954	Vehicle seat including a pivoting back urged forwards by a torsion bar A vehicle seat has a back mounted to pivot on a seat proper by a locking mechanism, and urged forwards by a torsion bar formed by a metal wire which has two ends fixed respectively to the back and to the seat proper. The metal wire constituting the torsio...	10/14/2003
6533352	Chair with reclining back rest A chair having a seat and a back rest. The back rest is attached to the seat via a back rest support element. The flat spring can be made from a non-metallic material, such as from fiberglass. The back rest support element comprises a flat spring disposed...	03/18/2003
6523895	Ergonomic chair A chair of the type having a seat and a separate seat back including a chair frame with a rear segment. The seat back is movably secured to the frame by a mounting mechanism whereby the seat back is capable of pivoting about at least two axes of rotation....	02/25/2003
6478379	Chair A chair has a pair of spaced-apart back support mounting members, a lower back support adapted to support the lower portion of the back of a person seated on the chair and mounted on the back support mounting members for pivotal movement about a pivot axi...	11/12/2002
6116687	Functional chair A seat part (20) of a functional chair is connected to a head part (16) of the pedestal (10) via a joint (18) comprising elastomeric material (38) such that it can be tilted relative to the head part (16) against spring force. A backrest part (28) is simi...	09/12/2000
5904397	Seating unit comprising two adjacent, pivotal support elements A seating unit having two adjacent and mutually pivotal support elements 3, 4) pivotal between an initial position and a maximum flexed position. A spring element (12) is secured between the support elements (3, 4) and biases the support elements (3, 4) i...	05/18/1999
5580127	Chair with tilting backrest In a chair having a backrest which can be reclined backwardly against the action of spring means, the latter comprises a leaf spring having its central portion operatively connected to the base structure of the chair and its ends connected to two side arm...	12/03/1996
5413401	Restraining protective seat for infants An infant-restraining protective seat (1) includes a seat back (3) tiltably attached to the body (7) of a seat portion via a turning shaft (20), with the seat portion (2) and seat back (3) being foldable. A torsion spring (54) is interposed between the bo...	05/09/1995
5344215	Backrest recliner mechanism A backrest recliner mechanism for a vehicle seat or the like includes a connector and a locking mechanism which both pivot about the same line. The backrest recliner mechanism also utilizes the energy of the backrest biasing spring to aid in the return of...	09/06/1994
5112108	Seating furniture A seating furniture includes a frame having a backrest mounting portion; a seat disposed on the frame; and a backrest disposed adjacent the backrest mounting portion. The backrest includes upper and lower backrest parts extending respectively above and be...	05/12/1992
4938532	Seating apparatus Seating apparatus comprising a seat support carrying a seat, a back element pivoted to said seat support which can articulate between forward and rearward positions in relation thereto, and torsion bar means extending between the back element and the seat...	07/03/1990
4747640	Chair support The chair support comprises a supporting structure, a seat holder and a backrest holder. The seat holder is pivotably or swivelably connected by means of a first swivel joint with the supporting structure and by means of a second swivel joint with the bac...	05/31/1988
4602818	Apparatus for the attachment of a lower back support upholstery to a chair An apparatus for the attachment of a lower back support upholstery by means of a spring to a back rest support, which is a four-sided tube. Preferably there are three springs formed from rubber and metal and which are arranged in an isosceles triangle. Ac...	07/29/1986
4597604	Support structures for chairs and the like having pivoting members A chair support structure including a pair of transversely spaced struts maintained in substantially fixed relationship to each other, the axes of the struts being inclined with respect to the horizontal and defining an imaginary surface therebetween, an ...	07/01/1986
4521053	Chair A chair comprising a supporting element adapted to tilt about a horizontal axis can be constructed in an ergometrically acceptable way when the supporting element is coupled with the frame through both a torsional spring and a gas spring. In this manner t...	06/04/1985
4400032	Eccentrically rotatable chair A chair for business or home use comprises a rotatable seat supported on a single leg at the bottom of which is a ball bearing caster. The leg is connected by a telescopically extensible arm to a pivot post which projects upwardly from the center of a cir...	08/23/1983
4316632	Ergonomic chair In order to achieve the necessary flexible curve according to the natural curve of the human spine in the field of back supports, the back support, attached relatively rigidly in its lower section to the seat, is constructed increasingly more flexibly tow...	02/23/1982
4135836	Chair back with polymer spring A chair back mounted on a chair back support plate is pivotally connected by a resilient arrangement to a housing slideably mounted on a vertical post. The resilient arrangement includes a member of a resilient material with ends, each end having enlarged...	01/23/1979
4043592	Adjustable seat back mechanism An adjustable seat back mechanism for a chair of the type such as a secretarial posture chair which includes a vertical support to which a seat back is slidably mounted. The seat back mechanism includes a channel shaped support plate secured to the seat b...	08/23/1977
3934930	Back support for chair A back support for a chair having a seat and a back pad. The support includes an elongated support member attached at one end to the chair seat and at its other end to the back pad. The back pad attachment includes a flexible block attached to the back pa...	01/27/1976

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Class 297/291 - Spring centers back on pivot