A foldable wheelchair having side frames arranged on both sides of the wheelchair, a cross-strut assembly and seat tubes for receiving a seat cover, wherein the cross-strut assembly is mounted, in regions remote from the seat tube, about parallel pivot axes in the side frame, and the axis of rotation of the struts of the cross-strut assembly is arranged parallel to the pivot axes of the cross-strut assembly, and the cross-strut assembly is connected to the seat tubes, which, in the unfolded position of the wheelchair, are received by seat tube bearings of the side frames, wherein the wheelchair has guide levers on both sides, and the respective guide lever is mounted, in a first region, in a strut of the cross-strut assembly, in a region of the cross-strut assembly between the axis of rotation of the struts of the cross-strut assembly and the seat tube, and this guide lever is mounted at a distance therefrom, in a second region, in the side frame assigned to the seat tube so as to be pivotable about a pivot axis, wherein this pivot axis is arranged parallel to the pivot axes of the cross-strut assembly in the side frames. The guide lever has a guide slot in its first region, and a guide pin, which engages in the guide slot, is connected to the strut assigned to the guide lever, and a cam is connected to the strut, and a cam follower is connected to the guide lever in its first region, wherein the cam and the cam follower interact in an end phase of the unfolding process of the wheelchair for the purpose of displacing the guide pin into a defined position in the guide slot.

A front wheel and a rear wheel are to be provided at a grounding frame. A body frame is mounted on the grounding frame and includes a mount at which a seat is to be provided. A relative position between the grounding frame and the body frame in a height direction of a wheelchair is changed via a height adjustment mechanism. The height adjustment mechanism includes an adjustment pole, a pole reception, and a holding portion. The adjustment pole extends along the height direction and is mounted on one of the body frame and the grounding frame. The pole reception is mounted on another of the body frame and the grounding frame and is engaged with the adjustment pole slidably in the height direction. The holding portion is to hold not to relatively move the adjustment pole with respect to the pole reception.

A back support includes an anchor plate attachable to a back frame of a wheelchair and a spanning plate securable to the anchor plate in a range of vertical positions to adjust a height of the back support. The spanning plate is secured to the anchor plate by a fastener secured through an aperture in the anchor plate and attached to a laterally extending bar selectively engageable with the spanning plate in a plurality of discrete vertical positions.

A wheelchair is disclosed. Two ends of each of the seat connection tubes are connected with the seat frame and the corresponding side frame, respectively. The seat frame and the seat connection tubes are telescopic by the combination of pressing units and holes. Two ends of each of the front connection tubes are connected with the front tube and the corresponding side frame, respectively. The front tube and the front connection tubes are telescopic by the combination of pressing units and holes. Two ends of each of the rear connection tubes are connected with the rear tube and the corresponding side frame. The rear tube and the rear connection tubes are telescopic by the combination of pressing units and holes. Each back connection tube is connected with the back unit and the corresponding supporting frame. The back unit and the back connection tubes are telescopic by the screwing elements.

A seat assembly includes a seat frame, a back frame defining a back plane pivotally connected to the seat frame at a pivot joint, a back support slideably secured to the back frame, and a back support adjusting mechanism. The back support adjusting mechanism includes a first linking member coupling the back support to the seat frame and pivotable about the pivot axis, and a first slide member slideably supported by the back frame and operatively connected to the first linking member. A second slide member is affixed to the back support and slideably supported by the back frame. A second linking member operatively connects the first and second slide members. Pivoting movement of the back frame from the upright position to the reclined position slides the first slide member away from the pivot axis, causing the second linking member to slide the back support toward the pivot axis.

An adjustable wheelchair for ready assembly in accordance with embodiments of the invention are disclosed. In one embodiment, the wheelchair includes, an undercarriage including, a horizontal axle including a first end segment telescopically coupled to a body segment and a second end segment telescopically coupled to the body segment opposite the first end segment allowing for adjustment of the wheelchair width, and a tongue including a body segment telescopically coupled to an end segment allowing for adjustment of the wheelchair length, and a seat post including an end segment telescopically coupled to a body segment allowing for adjusting the wheelchair seat height; and a pair of wheels; and a swivel wheel coupled to the tongue of the undercarriage to support the wheelchair and provide mobility; and a seat bottom coupled to the end segment of the seat post for load-bearing support; and a seatback rotatably coupled to the seat bottom.

An adjustable wheelchair and components thereof are provided. The wheelchair may include a first chassis connected to a first wheel on a first side of the wheelchair. The first chasses may include a first strut configured to laterally translate while supporting a seat. The wheelchair may further include a second chassis connected to a second wheel on a second side of the wheelchair. The second chasses may include a second strut configured to laterally translate while supporting the seat. A jack may be connected to the first chasses and second chasses. The jack may operatively cause the first and second chassis expand away from each other and contract toward each other to vary a width between the first side and second side of the wheelchair.

A powered wheelchair 100 with a tilt mechanism having multiple pivots that allows the wheelchair 100 to be driven and steered with or without the use of hands. The wheelchair 100 has two spaced apart drive wheels 101, each mounted to a separate shaft 104 that is independent of the other drive wheel. A drive controller drivingly coupled to the shafts 104 and the drive controller is housed within a base 102 that is pivotally situated on the shafts 104. A seat 103 mounted on a tilt mechanism enables the seat to tilt in a forward, backward, left and right direction as a result of the user displacing their body weight in either of those directions. The tilt mechanism includes three pivots, a primary pivot P1, secondary pivot P2 and tertiary pivot P3. The primary pivot P1 pivotally connects the base 102 to the shafts 104. The secondary pivot P2 is situated above and adjacent the base 102 so that the respective ends of the rod 105 are pivotally connected to the base 102.

An exemplary wheelchair comprises a main frame and a seat frame. Drive wheels and pivoting caster wheels are affixed to and support the main frame. The seat frame is connected to the main frame via left and right rear linkage arms, each rear linkage arm having a first end pivotally connected to the main frame and a second end pivotally connected to the seat frame, thereby allowing the seat frame to pivot relative to the main frame around a virtual pivot point. A seat plate having right, left, front, and rear sides is supported by the seat frame. A backrest frame is also connected to the seat frame. Left and right guide slots of the seat frame receive left and right guide rollers rotationally arranged at each end of a laterally oriented shaft connected to the main frame. The rear linkage arms and guide slots are configured so the virtual pivot point of the seat frame moves rearward when the seat frame is moved from an upright position to a tilted position.

The invention relates to a seat, backrest, lateral support bracket, and footrest that are able to be adapted to suit the needs of a physically disabled user. In general, the seat comprises a base frame, a seat base that is supported by the base frame, and a backrest. The backrest may be adapted to tilt with respect to the seat base and comprises a backrest angle adjustment system including a vertically extending angle adjustment slot located centrally on the backrest support and a pair of links pivotally attached to the seat frame and the angle adjuster wherein the angle adjuster comprises a lock with a projection through the angle adjustment slot and a fastener that engages with the projection.