Class 297/301.4 - Coil spring

Subclass of Class 297 - Chairs and seats
Definition: Opposed back movement where the resilient member is helical,
No. of patents: 58
Last issue date: 11/10/2009

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Number	Title	Issue Date
7614697	Coupling mechanism interposed between a seat and a back of a chair to prevent a reclining motion of the back from tilting the seat A chair has a coupling mechanism between a seat and a back, which includes a joining member, and a coupling member; the seat has two opposite front and two opposite rear ears on a bottom; the joining member is secured on a supporting tube for the seat, and has two o...	11/10/2009
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
7344195	Dampener for a vehicle seat recliner A recliner assembly for a vehicle seat having a seat back movably mounted relative to a seat bottom includes first and second frame members. The first frame member supports the seat back. The second frame member supports the seat bottom. The first frame member is pi...	03/18/2008
7316453	Chair spring tension control A tilt mechanism for an office chair includes a spring tension control that incorporates a wedge arrangement including a moveable wedge component that is displaceable laterally by turning a control knob below the seat of the chair, to force fixed wedge components ap...	01/08/2008
7293832	Chair adjustable device A chair adjustable device includes a base with which a seat frame and a backrest frame are respectively and pivotably connected. A positioning mechanism is connected to the base and includes an operation handle which is able to shift a transmission frame and a posit...	11/13/2007
7293833	Chair and support mechanism unit thereof A chair is provided with a base 6 fixed at an upper end of a leg pillar 5, a back support unit 13 attached to the base 6 so as to tilt backward, a backrest 3 attached to the back support unit 13, and a spring unit 14 ...	11/13/2007
7281764	Tension control mechanism for chair The chair includes seat and back assemblies interconnected in a four-bar linkage. The chair further includes a tension mechanism comprising a coil spring projecting forwardly from a base and an adjustment linkage which is connected to said coil spring and to a front...	10/16/2007
7278685	Recliner A reclining apparatus includes a base, a reclining element and a control element. The base is arranged between a seat and a post of a chair. The reclining element is connected to a backrest of the chair and pivotally installed on the base. The reclining element defi...	10/09/2007
7264312	Backrest adjusting mechanism A backrest adjusting mechanism is angularly disposed between a backrest and a seat of a chair, and includes a main support slidably received in a sleeve member, and a locating gear. The main support is provided on a middle lower surface with a downward projected lim...	09/04/2007
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
7234775	Dynamically balanced seat assembly having independently and arcuately movable seat and backrest and method A seat assembly (21) including a seat (22), a backrest (23) and a mounting assembly (24) mounting the seat (22) in a near horizontal orientation for movement along an upwardly concaved arcuate seat path having a center of curvature...	06/26/2007
7198328	Locking device for an office chair structure with an articulation permitting the movement of the seat and the seat back and related structures of the chair A locking device in an office chair structure of the type with articulation permitting the movement of the adjustable seat and seat back, with a mobile base from which a column rises, which is adjustable in height, and which supports a seat plane and a hinged seat b...	04/03/2007
7172539	Abdominal exercising support apparatus An exercise apparatus for use in performing abdominal exercises. The apparatus includes a back support member having a first side for supporting a back of a user and a headrest having a first side for resting a head of a user thereagainst. A device for supporting a ...	02/06/2007
7159943	Adjustable office arm chair structure with articulation for the synchronous movement of the seat and the backrest A structure for an office chair with articulation by synchronized movement of the seat and the backrest of the adjustable type includes a swivel type movable base with a height adjustable column supporting a seat surface and a reciprocally hinged backrest. The seat ...	01/09/2007
7159937	Reclining chair A reclining chair, in particular a passenger chair, for use in a vehicle such as an aircraft, bus or mobile home. The chair includes a base assembly, a seat frame located above the base assembly, a seat attached to the seat frame, and a seat back connected to the se...	01/09/2007
7140677	Ball chair A ball chair has a seat, a backrest assembly and a ball cushion. The seat has a top face, a passage defined in the top surface of the seat, at least three legs formed on the seat and each leg and a supporting base formed on seat. The backrest assembly mounted on the...	11/28/2006
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
7066554	Control device having a collapsible operating handle A control device for use in a chair includes a casing fastened to the chair at the bottom side, a control rod pivoted to the casing, and an operating handle pivoted to the control rod and turnable between an operative position for rotation by the user to bias the co...	06/27/2006
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
7040703	Health chair a dynamically balanced task chair Healthy task seating is achieved by integrating three dynamics into a unique, dynamically balanced chair design that provides: (a) adaptable design features to accommodate a wide range of body dimensions, (b) a series of independent and adjustable support means to a...	05/09/2006
7017992	Chair control device for a tiltable chair A chair control device for a tiltable chair wherein the chair control includes a a one-piece integral structure mainframe housing, including an integral extension for a seat locking cam means, for supporting adjustment mechanisms. The housing is affixed to the under...	03/28/2006
7017988	Retractable work surface for a chair A retractable work surface for a chair is provided for a chair that has a pair of arms. The work surface has a removable plate that can be coupled to one of the chair arms or the other. An L-shaped rod is coupled on one end to the plate so that is can rotate with re...	03/28/2006
6974188	Chair with pivotable chair back A chair comprises a frame, a chair back, and a chair back return device. The chair back is mounted to the frame for pivotable movement away from a home position. The chair back return device is arranged to return the chair back to the home position. ...	12/13/2005
6945601	Multi-stage backrest assembly A multi-stage backrest assembly for a chair includes a support frame, a back support mounted on the support frame, a head support mounted on the support frame, and a waist support pivotally mounted on the back support. Thus, the backrest assembly has a pivotable fun...	09/20/2005
6942295	Reclining chair system A reclining chair system with a standard assembly supporting seat and backrest assemblies, which are pivotally mounted to each other and capable of providing a rocker effect to a user. A strut assembly provides substantially a bounce free shock absorbing function by...	09/13/2005
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
6929327	Chair with oscillating seat A chair, in particular an office chair, comprising: a base structure, a seat support structure, articulated to the base structure around a transverse axis, an adjustable elastic device to apply an elastic force between the base structure and the seat support structu...	08/16/2005
6874853	Chair This object is attained in a chair comprising a pedestal; a seat support supported thereon via a chair column, said seat support comprising a front and a rear seat support element being connected with one another via a pivot axis extending substantially horizontally...	04/05/2005
6709056	Preloaded spring arrangement, in particular for spring loading office chair synchronizing mechanisms A preloaded spring arrangement, in particular for spring loading office chair synchronizing mechanisms, comprises a pair of leg springs, which are coaxially positioned on a common axis, each having a supporting leg and a positioning leg; and a preferably manually op...	03/23/2004
6607244	Reclining chair A reclining chair including a support base, a chair seat rotatably coupled at its forward portion to the support base, a substantially vertically disposed coil spring provided adjacent the forward portion of the seat and between the seat and the support b...	08/19/2003
6588843	Chair control A chair control providing both articulating tilt motion and dual-ratio, adjustable, synchronized tilt motion. In a first aspect, the control can be configured as either an articulating tilt control or a synchronized tilt control. In a second aspect, the a...	07/08/2003
6572191	Chair, in particular office chair, having a synchronous mechanism A chair, in particular office chair, comprises a pedestal; a seat support supported thereon by a chair column and having front and rear seat support elements which are interconnected by a pivot axis; a seat supported on the seat support elements; a backre...	06/03/2003
6276755	Swivel arrangement for a chair seat A swivel arrangement is provided for a chair having a backrest, a chair seat, a chassis, and a base. The chassis includes a swivel seat mounted to an underside of the chair seat, a first connecting seat, a second connecting seat, a spring seat, a control ...	08/21/2001
6213552	Multi-position chair control mechanism for synchronously adjusting the seat and backrest of a chair A seat adjustment mechanism for a chair includes a first handle which controls the height of the seat above a surface supporting the chair. A second handle allows the user to selectively lock the seat at a user selected angle relative to the supporting su...	04/10/2001
6120096	Mechanical device for synchronous movement of the backrest and seat of a chair A mechanical device for synchronous movement of a seat and a backrest of a chair comprising a first supporting bracket which is associated with a central column which protrudes from a rotating base and is pivoted transversely to an end of a second fixing ...	09/19/2000
6059363	Chairback with side torsional movement An office-type chair which includes a seat assembly and back assembly that are pivotally supported on a chair base or pedestal to support a user thereon. To increase the comfort of the user, the seat assembly is tiltable forwardly and rearwardly by way of...	05/09/2000
6039398	Device for adjusting the inclination of the back-rest relative to the seating portion in chairs in general A device for adjusting the inclination of the back-rest to the seating portion in chairs in general, comprising a first structural element rigid with the seating portion and a second structural element rigid with the back-rest and hinged to the first stru...	03/21/2000
6039397	Tilt back chair control A tilt back chair provides for selective independent and concurrent movement of a chair back with respect to a chair seat. The seat is mounted to a spring biased bracket for pivotal movement about a seat tilt axis. The back is connected to a pair of pivot...	03/21/2000
5951109	Chairback with side torsional movement An office-type chair which includes a seat assembly and back assembly that are pivotally supported on a chair base or pedestal to support a user thereon. To increase the comfort of the user, the seat assembly is tiltable forwardly and rearwardly by way of...	09/14/1999
5918935	Reclining chair A reclining chair including a support base, a chair seat rotatably coupled at its forward portion to the support base, a substantially vertically disposed coil spring provided adjacent the forward portion of the seat and between the seat and the support b...	07/06/1999

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Class 297/301.4 - Coil spring