Abstract: A body support assembly includes a seat assembly and backrest assembly supported by a tilt control assembly. Methods of using and assembling the body support assembly are provided.

Abstract: An apparatus that satisfies the need for a portable and foldable exercise equipment to perform glute bridge, hip thrust and other resistance band exercises without the need for additional equipment. The apparatus includes opposing panels hingedly connected, and accommodations to affix resistance bands to the panels. A cross member is preferably hingedly connected to one panel and extends through an opening and engages the other panel. A resistance band may include an adjustable belt so that a user may securely fasten himself or herself between the opposing panels and the resistance band to perform the glute bridge, hip thrust or other exercises.

Abstract: A chair includes a seat and a backrest connected to a leg assembly. The front part of the seat is mounted on the leg assembly via a pivot link about an axis. The backrest is connected to the seat by a flexible intermediate part fixed to the leg assembly in the vicinity of the pivot of the seat for the purpose of a pivoting movement of the intermediate part by elastic deformation about an axis. The rear part of the seat is supported by the intermediate part, for example with at least one coupling element.

Abstract: A chair includes a base, a support element and a torsion element. The support element is coupled to the base and includes a seat region, a backrest region and a transition region connecting the seat region and the backrest region. The backrest region is reclinable relative to the seat region by way of elastic deformation of the support element. The torsion element is coupled to the base and to the backrest region. The torsion element controls the reclining of the backrest region relative to the seat region. The support element is exclusively connected to the torsion element above a lumbar region, wherein the backrest region can be inclined and/or twisted in relation to the seat region.

Abstract: A chair back structure is disclosed and includes a chair back that includes a frame, an upper support pad coupled to an upper portion of the frame, and a lower support pad arranged at a lower end of the upper support pad, and an elastic connection piece connecting the upper support pad and the lower support pad to each other. The upper support pad includes a lower support pad coupling seat. The lower support pad includes an upper support pad coupling seat. The elastic connection piece has an upper end mounted to the lower support pad coupling seat of the upper support pad and a lower end mounted to the upper support pad coupling seat of the lower support pad, so that the lower support pad is provided with elasticity and movability by means of the elastic connection piece.

Abstract: A chair comprising a base structure comprising a support, a seat connected to the support via a synchronization mechanism and movable with respect to the base structure between a lowered position and a raised position, and a backrest connected to the synchronization mechanism and movable between an upright position, corresponding to the lowered position of the seat, and a backward-inclined position corresponding to the raised position of the seat, wherein the synchronization mechanism comprises two loop-shaped elastic elements spaced apart in a transverse direction and each comprising a lower portion fixed to a rigid support, an upper portion fixed to the seat, a front elastic portion and an essentially C-shaped rear elastic portion that connect the upper portion to the lower portion, wherein the backrest is fixed to the rear elastic portions of the loop-shaped elastic elements.

Abstract: A space adjustment mechanism for a chair includes a seat base unit, a backrest sliding unit and an angular cross linking unit. The seat base unit has a body portion for accommodating an occupant sitting thereupon, and a shaft extending downward from the body portion. The backrest sliding unit has a backrest connected with a slidable rack which is slidably engaged with the body portion and formed with a pair of tubular sections. The angular cross linking unit has a first extending member for telescopically engaged with the shaft, and a pair of second extending members for telescopically engaged with the tubular sections. By this mechanism, when the first extending member is moving downward along the shaft, the backrest is driven to move backward for accommodating elder child, when the first extending member is moving upward, the backrest is driven to move forward for accommodating little child.

Abstract: A chair assembly includes a base structure, a seat support structure movably coupled to the base structure, an upwardly-extending back support structure movably coupled to the base structure, wherein the back support structure is adapted to move between an upright and reclined positions, wherein the back support structure is operably coupled to the seat support structure, a flexible shell structure defining a forwardly-facing surface forming a lumbar support, wherein the flexible shell is movably coupled to the seat support structure, and a resilient member generating a variable compressive force acting on the flexible shell structure in a manner that tends to cause a curvature of the back support structure to increase, and wherein the compressive force decreases as the back support structure moves from the upright position to the reclined position.

Abstract: A chair assembly includes a base structure, a seat support structure pivotably coupled to the base structure, a back support structure pivotably coupled to the base structure and including an upwardly extending portion adapted to move between an upright position and a reclined position, a control link having a first end pivotably coupled to the seat support structure and a second end pivotably coupled to the back support structure, a back support surface having an upper portion pivotably coupled to the back support, and a back link pivotably coupled to the seat support structure, wherein the back support surface is moved forward by the back link relative to the upwardly extending portion of the back support structure as the back support structure is moved from the upright position to the reclined position.

Abstract: A chair assembly including a first chair structure, a second chair structure, an actuator assembly coupled to the second chair structure to move the second chair structure between the first and second positions, a control input assembly coupled to the first chair structure, and a control link assembly coupling the control input assembly with the actuator assembly to move the second chair structure between first and second positions, and including a first shaft operably coupled to the control link, and rotatable about a second axis that is substantially orthogonal to the first axis and to the first direction, and first and second universal joint assemblies coupling the first shaft member to the second shaft, wherein actuation of the control input moves the second chair structure between the first and second positions.

Abstract: A chair assembly includes a back shell member including a laterally-extending top portion, a laterally-extending bottom portion and a pair of longitudinally-extending side portions extending between the top portion and the bottom portion and cooperating therewith the defined open space therebetween, and a cover having a first surface adapted to support a seated user and a second surface opposite the first surface, wherein the cover is positioned over the back shell member to cover at least a portion of the open space, and wherein the cover comprises an elastomeric material having a longitudinal direction compliance to lateral direction compliance ration of at least 3:1.

Abstract: A chair comprises at least a seat assembly, an armrest, a backrest, and a spring linkage. The backrest frame ends are connected to the upstanding back-leg frame ends of the seat assembly by the spring linkages to make a chair with a flexible spring backrest. Each spring linkage is of a U-shaped configuration having two ends spaced vertically apart; the upper end attached to the backrest frame and the lower end attached to the back-legs of the seat assembly. The tip of the spring linkage serves as a pivotal axis, allowing the backrest to be flexible and bend backwards in response to an applied force while returning to its normal position when the force is removed.

Abstract: A seating structure includes a backrest member having an upper edge, opposite side edges and a lower edge. The backrest member has a forwardly facing convex shape formed along a vertical centerline thereof between the upper and lower edges. The lower edge has a forwardly facing concave shape. The lower edge has outer portions positioned forwardly of an entirety of the upper edge.

Abstract: A seat back of vehicle seat including: a seat back frame; a support wire element disposed in the seat back frame; a support plate attached to the support wire element such that an upper portion thereof projects upwardly from the support wire element; and a resilient reinforcing element provided to that upper portion of support wire element, thereby normally reinforcing such upper portion. The resilient reinforcing element has two upper end portions respectively slidably engaged with two brackets of the seat back frame and a main reinforcing portion which is resiliently extensible, while being resiliently deformable rearwardly of the seat back frame. Another resilient reinforcing element having a pair of reinforcing portions may be provided to a lower portion of the support wire element to normally reinforce such upper portion. Each of those two different reinforcing elements is resiliently deformable rearwardly by an excessive great load applied thereto.

Abstract: A reclining chair has a base coupled to a chair back. The chair back is adapted to recline from an upright position to a reclined position. To accommodate that reclining motion, the chair back includes a flex zone formed with notches extending through an inner portion of the flex zone. Those notches narrow as the chair back reclines from the upright position to the reclined position. The flex zone also includes an outer portion that is separated from the inner portion by a gap, the outer portion having one or more notches extending through the outer portion. Those notches also narrow as the chair back reclines from the upright position to the reclined position.

Abstract: An article of furniture includes a base, a seat frame supported by the base, and a back frame attached to the seat frame. The back frame includes an upper portion and a lower portion. The upper portion is connected to the lower portion by at least one first elastomeric member such that the upper portion is moveable relative to the lower portion. The upper portion is moveable from an upright position to at least one reclined position. In some embodiments of the article of furniture, the at least one first elastomeric member is a strap composed of a polymeric material, such as, for example, a thermoplastic polyester elastomer or a polymeric material containing at least one elastomer. In some embodiments, the article of furniture may be designed as a chair, a lounge chair, or an office chair.

Abstract: Follow-up performance to respiratory movements is made higher than that of the prior art without obstructing movements of the pelvis of a person. A configuration is adopted that a cushioning member arrangement frame for a seat back 34, 140 and a cushioning member arrangement frame for a seat cushion are displaced according to load fluctuation to a cushioning member for a seat back 40, 150 or a cushioning member for a seat cushion 20. That is, such a configuration is adopted that the cushioning member arrangement frame for a seat back 34, 140 or the cushioning member for a seat cushion 20 not only moves according to load fluctuation but also frames themselves supporting them move via tension structure members spread over the frames (a cushioning member for a seat back and a cushioning member for a seat cushion).

Abstract: A seating structure includes a backrest member having an upper edge, opposite side edges and a lower edge. The backrest member has a forwardly facing convex shape formed along a vertical centerline thereof between the upper and lower edges. The lower edge has a forwardly facing concave shape. The lower edge has outer portions positioned forwardly of an entirety of the upper edge.

Abstract: A chair comprising, a base structure including two rear tubular elements open at the top, a backrest having two tubular portions open at the bottom and aligned to said tubular elements of the base structure, and two elastic devices, each of which has a top support inserted in a tubular portion of the backrest, a bottom support inserted in the corresponding tubular element of the base structure, and an elastic element flexurally deformable to enable tilting between the top support and the bottom support, wherein each of said elastic devices comprises a plurality of sectors stacked on top of one another and arranged between the top support and the bottom support, and wherein, in a resting position of the elastic element, a plurality of slits are formed on the rear side of each elastic device between each pair of adjacent sectors.

Abstract: A weight-responsive chair is provided which has a weight-activated mechanism that resists rearward tilting of a chair back upright while also effecting lifting of a rear portion of the seat to counteract the rearward tilt forces. The weight-activated mechanism includes a spring package connected between the chair frame and back upright which provides for ready mounting of same to the chair frame. Further, the rear seat portion is connected in lifting engagement with the upright but also includes independent suspension for the center of the rear seat portion to allow for independent movement and flexing thereof to improve comfort for the chair occupant.

Abstract: A chair that includes a support module, a seat carrier, an initially forwardly declined seat member articulated to the seat carrier such as by being pivotal along a front, and an initially rearwardly angled backrest carrier having a backrest member, the carrier articulated to the seat carrier such as by being pivotal along a lower end. The angular positions of the seat and backrest member are largely controlled via an actuator arm and adjustable spring arrangement, wherein the actuator arm directly links the seat member to the backrest carrier and the spring arrangement returns the backrest carrier and seat member to initial positions when a weighted load is lessened or removed from the rear of the seat member. A pneumatic cylinder to provide resistance to the seat member, a limiter to limit a maximum and minimum angular position of the seat member, adjustable arm rests, and casters may be included.

Abstract: A chair has a seat 1 and a backrest 2 and the backrest 2 is allowed to be tilted backward by elastic deformation of right and left back frame devices 4. The right and left back frame devices 4 each are composed of two unit frames 43 and 44. The back frame device 4 has a main portion 4a which are disposed outside the right and left sides of the seat 1, upper inward portions 43a and 44a which are connected to an upper rear end of the main portion 4a, lower inward portions 43b and 44b which go under the seat 1 from a lower end portion of the main portion 4a, and forward end portions 43c and 44c which are integrally connected to the lower inward portions 43b and 44b. The forward end portions 43c and 44c are fixed to the base 7.

Abstract: The present invention intends to arrange the appearance of furniture at a connecting portion between a first member having stiffness and a second member movable relative to the first member and having stiffness without forming the connecting portion in an unnaturally large diameter. More specifically, the present invention provides a structure for connecting members comprising: a first member having stiffness; a second member movable relative to the first member and having stiffness; and a spring member in which an end portion thereof is connected to the first member and other end portion thereof is connected to the second member so as to accumulate a reaction force by elastic deformation, wherein the spring member is formed into a frame-like shape extending along the first and second members.

Abstract: An angle-adjusting structure for a backrest of a chair is mounted at a rear side of a butterfly-shaped mounting member of the chair. The angle-adjusting structure includes a main body and a rotating member jointly passed through by a shaft having external teeth. A resilient element is mounted around an end of the shaft. A cover is secured to the main body by threaded fasteners. A pressing member is mounted on the other end of the shaft. By pressing the pressing member inward, the external teeth of the shaft are disengaged from internal teeth of the rotating member, and the rotating member is allowed to rotate freely. When the pressing member is released, the resilient element mounted around the end of the shaft extends outward to re-engage the external teeth of the shaft with the internal teeth of the rotating member, thereby securing the rotating member in place.

Abstract: A structure intends to arrange the appearance of furniture at a connecting portion between a first member having stiffness and a second member movable relative to the first member and having stiffness without forming the connecting portion in an unnaturally large diameter. More specifically, the present invention provides a structure for connecting members comprising: a first member having stiffness; a second member movable relative to the first member and having stiffness; and a spring member in which an end portion thereof is connected to the first member and other end portion thereof is connected to the second member so as to accumulate a reaction force by elastic deformation, wherein the spring member is formed into a frame-like shape extending along the first and second members.

Abstract: A structure for attaching a frame-like spring being capable of effectively reducing the number of parts, is provided. According to this structure, a reaction force frame element which is a frame-like spring is attached via a lower frame portion and an upper frame portion so that pressurization is always provided in the movable range and the pressurization becomes the lowest at a predetermined position of a normal posture. Specifically, when the a reaction force frame element is made into the attaching preparation posture that the elastic repulsive forces are accumulated rather than a normal posture, the upper attaching portions include insertion portions for allowing insertion of lower ends and engagement portions to be engaged to the lower end portions due to an elastic repulsive force when the external force is released.

Abstract: 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 components and requires minimum maintenance and provides a solid and reliable reclining mechanism. The chair enables the user to secure an accurate posture of sitting during eating and also enables the user to enjoy a relaxing posture while sitting on the same dining chair.

Abstract: An improved chair is disclosed. The chair includes: (i) a seat; (ii) a base portion connected to the bottom of the seat; (iv) an upwardly extending support frame connected to either the seat or the base; and (v) a backrest connected to the support frame by a number of fasteners. The fasteners include a resilient member located between the backrest and the support frame, such that the backrest is spaced apart from the support frame.

Abstract: A chair comprising a supporting structure having a seat and a backrest, in which the backrest comprises a deformable resting portion made of plastic material which has a non-planar resting surface provided with at least one weakened area which enables an elastic deformation of the resting portion so that the resting portion assumes a configuration bent backwards under the action of a thrust applied backwards by the user, two uprights formed integrally on the lateral sides of the resting portion, and two side connection elements, which connect the backrest to the supporting structure, formed integrally at the bottom ends of the uprights. The backrest is provided with elastic stiffening elements made of a material different from the material constituting the resting portion and arranged only in an area corresponding to the uprights so as to bestow upon said uprights a rigidity to bending higher than that of the resting portion.

Abstract: 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 spring connected both to the first supporting element and to the second supporting element, to allow a reciprocal elastic oscillation, of a determined amplitude, between the backrest, which can oscillate, and the seat, which remain still. In a wall of the first supporting element a lodging seat is provided to lodge, at least partially, the spring in such a manner that the longitudinal axis of the spring is substantially aligned with respect to the first supporting element.

Abstract: 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 least substantially maintaining the contour of the upper region of the backrest when a person leans back in the chair.

Abstract: A bucket seat includes a support surface (14), curved shaped members (1) for supporting the support surface (14), receiving members (2) for receiving respective shaped members (1) and extending in a same direction as the shaped members (1), and an arrangement for rotating the shaped members (1) and the receiving members (2) in opposite direction for changing an inclination of the support surface (14), with an alignment of respective shaped members (1) and the receiving members (2) being maintained.

Abstract: 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 a rearwards thrust applied by the user and elastically returns to the resting position when the rearwards thrust ceases. The rearwards tilting of the backrest is formed in part by an elastic detonation of the bearing portion and in part by a displacement of at least a part of the connecting portion relative to the support structure.

Abstract: A seat suspension assembly including a base including a first pair of spaced legs adapted to be securable to a support structure. The first pair of legs is connected to a back member. A seat frame is adapted to support a seating surface and disposed between the first pair of spaced legs of the base. The seat frame is movably connected to the base. The seat frame includes a first guide engageable with one of the pair of legs. The first guide permits controlled movement of the seat frame relative to the base. A suspension extends between the seat frame and the base for regulating the motion of the seat frame relative to the base.

Abstract: A chair comprises a seat support assembly including a seat support, the seat support assembly being adapted to stand on a surface so as to provide the seat support at a suitable height for a person to sit on, and a back support assembly, including a back frame member and a back support. In one embodiment, the back frame member has a curved middle portion substantially in the plane of the back support, and first and second end portions substantially in the plane of the seat support. The back frame member is flexibly interconnected to the seat support assembly by a first spring flexibly interconnecting the first end portion of the back frame member and the seat support assembly; and a second spring flexibly interconnecting the second end portion of the back frame and the seat support assembly.

Abstract: A chair (10) includes a supporting frame (20,22) and a seat portion (14) which is foldable about a transverse fold to define a rearward portion behind the transverse fold and a forward portion, forward of the transverse fold. The seat portion (14) is supported above the supporting frame by its rearward portion. The chair (10) also includes a reclinable back portion (16) and a recline mechanism with which the back portion (16) is connected for reclining action of the back portion (16). The recline mechanism is operably linked to the rearward portion of the seat portion (14) such that on reclining action of the back portion (16), the rearward portion is moved to increase in rearward tilt angle and to obtain a net increase in height above the supporting frame (20,22), with a consequent folding of the seat portion about the transverse fold line under the weight (W) of the occupant.

Abstract: A synchrotilt chair includes a base, a back, a seat, and a link(s) pivoted to a rear of the base and to a bottom of the back to form a four-bar linkage arrangement. In one form, the chairs are nestable and stackable for dense storage. In another form, the chairs are desk-type pedestal chairs. Several of the structural support members of the chair are gas-assisted injection molding to form a hollow tubular perimeter frame that is lightweight, strong, and dimensionally-accurate A flexible panel is integrally molded between opposing sides of the perimeter frame. Armrests are pivoted to the back and have a shape configured to allow nested stacking while also providing excellent comfort, durability, and style. Also, the armrests are movable to remote storage positions to provide unobstructed side access to the seat of the chair.

Abstract: 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 limit stop is configured to limit a degree of rotation of the backrest frame between an upright position and a maximum backwardly rotated position. An elongate spring element extends from within the backrest frame into the seat frame, and is configured to bias the backrest frame in the upright position, and to resiliently resist backward rotation. In various embodiments, a cam surface is associated with the spring element, providing an effective fulcrum point which moves rearwardly as the backrest frame reclines, thereby increasing the effective flexural resistance of the spring element during reclining.

Abstract: In a chair 1 having an upholstery member 7 fitted on a backrest portion or seat plate 4 serving as a portion adapted to contact a human body, upright portions 41 and elastic pieces 8 allowing their deflection in the direction in which the load of a human body contacting the chair works are provided and the upholstery member 7 is placed over the upright portions 41 and elastic pieces 8 so that the contacting portion of the seat portion or backrest portion is imparted with elasticity to ensure a better sitting comfort even if the upholstery member 7 lacks elasticity.

Abstract: A chair comprising a supporting structure (12) having a pair of front legs (20a) and a pair of rear legs (22) and carrying a seat (14) and a backrest (16). The supporting structure (12) comprises a transverse element (18), a first pair of bars (20) fixed to the ends of the transverse element (18) and forming the pair of front legs, and a second pair of bars (22) fixed to the ends of the transverse element (18) and forming the pair of rear legs.

Abstract: A back mounting arrangement for a chair in which a back member is pivotable relative to a seat member. The back mounting arrangement includes a flexible bar-type pivot member interposed between the seat member and the back member. The pivot member includes an upper section received within a passage associated with the back member, and a lower section received within a passage associated with the seat member. The pivot member is formed of a resilient material and is flexible so as to enable the back member to be pivoted rearwardly relative to the seat member, and to provide a forward bias to the back member for resisting rearward pressure applied to the back member. A limit member, in the form of a limit strap, is engaged with the pivot member for limiting rearward pivoting movement of the back member relative to the seat member. The limit strap includes an opening which receives a protrusion associated with the pivot member.

Abstract: Disclosed is a chair and a method using the chair, which can be not only used easily and comfortably but also utilized in treating an improper alignment of spinal vertebrae. The chair has a seat assembly for seating the user on the seat assembly, the seat assembly being operated by the user in such a manner as that the user can adjust a height of the seat assembly; a backrest assembly for supporting a back of the user, the backrest assembly being operated separately from the seat assembly by the user in such a manner that the user can adjust a height of the backrest assembly; a headrest assembly for resting a head of the user on the headrest assembly, the headrest assembly being assembled with the backrest assembly; and a backrest frame for supporting the backrest assembly and the headrest assembly, the backrest frame being fixed to the seat assembly, the backrest assembly moving along the backrest frame when the height of the backrest assembly is adjusted.

Abstract: The present invention provides support assembly having a resilient support frame having a ground engaging portion and an upper portion. The upper portion is moveable with respect to the ground engaging portion. A suspension assembly is coupled to the upper portion of the support frame such that motion of the upper portion imparts motion to the suspension assembly. In another aspect of the invention, the invention includes a seat supported on a resilient support frame having a ground engaging portion and an upper portion moveable with respect to the ground engaging portion. A mobile is coupled to the upper portion such that motion of the upper portion imparts a corresponding motion to the mobile.

Abstract: A synchrotilt chair includes a base, a back, a seat, and a link(s) pivoted to a rear of the base and to a bottom of the back to form a four-bar linkage arrangement. A spring arrangement includes a resilient member at one of the joints of each link to bias the link and in turn the back and seat toward an upright position, with the back and seat pivoting with a synchronous motion upon recline of the back. In one form, the chairs are nestable and stackable for dense storage. In another form, the chairs are desk-type pedestal chairs. Several of the structural support members of the chair are gas-assisted injection molding to form a hollow tubular shape that is lightweight, strong, and dimensionally-accurate. Armrests are pivoted to the back and have a shape configured to allow nested stacking while also providing excellent comfort, durability, and style. Also, the armrests are movable to remote storage positions to provide unobstructed side access to the seat of the chair.

Abstract: A chair including a seat assembly having an improved seat spring system to provide a flexible spring backrest frame. A pair of ends of spaced apart backrest frame members are arranged in registry with respective ends of seat support frame members, with each end positioned in spaced apart alignment across a gap from the respective end of each frame member. An elongated shaped flexible spring element spans each gap, with each spring element having opposed ends being extended a distance along each frame member from the gap. Each opposed end is restrained by a first and a second elongated U-shaped holder receptor paired and separately attachable to each opposed end of the spring element. Each holder receptor includes an opening end being faced towards and in alignment with the second holder opening end. The spring element is positioned between each opening end in side-by-side orientation beside the frame members, providing controlled angular range of motion of the backrest frame when moved by a chair occupant.

Abstract: An articulated support chair has a frame, a seat cantilevered from the frame, and a back hanging from the frame, with a lower end of the back hinged to an underside of the seat. A lumbar support extends from the seat and pivots to maintain supporting contact as the angles of the seat and back change under varying load conditions. In further embodiments, arm rests may be rigidly coupled below the seat to the back, and a fold-down tablet may be affixed to the frame at one side of the seat. Wedge units assemble in a modular fashion to define straight or different curved or bent rows for waiting room, conference room, or auditorium/theater installations and provide side tables, lockable cabinets, or utility and light bays between adjacent seats. A task chair, a side chair, and tandem chair embodiments are described.

Abstract: A back frame for a vehicle seat assembly having an upright frame member capable of supporting compressive and tensile loading and a secondary, tensile load carrying member capable only of supporting significant loads in tension. The tensile load carrying member is attached to the upright frame member at the upper end of the back frame and extends downward behind the upright frame member and is attached to a base at the lower end of the back frame. The upright frame member is also attached to the base at the lower end of the back frame. The result is a triangular truss formed by the upright frame member, the tensile load carrying member and the base.

Abstract: 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) into the initial position. The spring element (12) comprises a base member (13) arranged in an area between the support elements (3, 4). At least one engagement element extends from the base member (13) into cavity (14, 15) in one of the support elements (3, 4) such that the support elements (3, 4) may pivot relative to each other. The engagement element is provided with a rigid stop (17, 17') projecting from the base member (13) to define the maximum flexed position of the support elements. The engagement element is further provided with a leaf spring (18, 18'; 68) to restore the support elements (3, 4) to their initial position.

Abstract: A wheelchair having an ergonomically designed seat assembly is provided. The seat assembly includes a backrest subassembly connected to a seat frame The backrest subassembly includes a backrest frame, at least one resilient pivotal member connected to the backrest frame, and a backrest connected to the at least one resilient pivotal member such that the backrest is capable of resilient pivotal flexing about a transverse horizontal axis. A seat is pivotally connected to the seat frame such that the seat is capable of pivotal tilting about a transverse horizontal axis relative to the seat frame and independent of the backrest subassembly. At least one resilient member is disposed between the seat frame and the seat so as to allow resilient relative pivotal tilting therebetween. Two leg rests are pivotally connected to the seat frame such that the leg rests are capable of pivoting about a transverse horizontal axis relative to the seat frame.

Abstract: A chair, with an elastic movable means capable of allowing the back of the chair to be leaned back at an angle of inclination, is disclosed. The chair has one or more leg frames. A seat frame is mounted to the top portion of the leg frames and holds a seat. A back frame is connected to the seat frame and holds a back. The elastic movable means is provided at the junction between the seat and back frames and allows the back frame to be elastically leaned back relative to the seat frame. The elastic movable means has two leaning angle limit units at both ends and one torsion bar extending between the two limit units. Each of the two limit units is fitted into the seat and back frames at opposite ends and limits the leaning angle of the back frame. The torsion bar elastically returns the back frame from a leaned position to the original position.