An adjustable wheelchair is disclosed which adjusts to changes in a user's size and weight which includes a scissor-type foldable mechanism which connects two side frames. Wheels for the wheelchair are attached to each of the side frames. An adjustable seat and adjustable back support are a flexible material which span from one side frame to the other. These are designed to unroll and lengthen or roll up and shorten the width of the seat and the back support between the side frames. The scissor-type foldable mechanism includes a tube which slides within a tube, a threaded rod and a threaded stop which function to allow pre-adjustment of the width of the foldable mechanism such that it may be folded and opened to the pre-adjusted width. The frames may be supplemented with reinforcements to accommodate a change in the user's weight.

An adjustable wheelchair is disclosed which adjusts to changes in a user's size and weight which includes a scissor-type foldable mechanism which connects two side frames. Wheels for the wheelchair are attached to each of the side frames. An adjustable seat and adjustable back support are a flexible material which span from one side frame to the other. These are designed to unroll and lengthen or roll up and shorten the width of the seat and the back support between the side frames. The scissor-type foldable mechanism includes a tube which slides within a tube, a threaded rod and a threaded stop which function to allow pre-adjustment of the width of the foldable mechanism such that it may be folded and opened to the pre-adjusted width. The frames may be supplemented with reinforcements to accommodate a change in the user's weight.

A seat assembly includes a seat frame, a back frame 320 defining a back plane pivotally connected to the seat frame at a pivot joint, a back support 310 slideably secured to the back frame, and a back support adjusting mechanism. The back support adjusting mechanism includes a first linking member 355 coupling the back support to the seat frame and pivotable about the pivot axis, and a first slide member 351 slideably supported by the back frame and operatively connected to the first linking member. A second slide member 354a is affixed to the back support and slideably supported by the back frame. A second linking member 352 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.

A seat system for a wheelchair. The seat system comprises: a left-thigh support comprising an upper-thigh support part and a lower-thigh support part; and a right-thigh support comprising an upper-thigh support part and a lower-thigh support part; wherein the lower-thigh support part of the left-thigh support is separate to the lower-thigh support part of the right-thigh support, and either the upper-thigh support part or the lower-thigh support part of each of the left- and right-thigh supports comprises one or more first engagement members and the other of the upper-thigh support part or the lower-thigh support part of each of the left- and right-thigh supports comprises two or more second engagement members, each of the first engagement members being received or receivable between two of the two or more second engagement members such that the one or more first engagement members and the two or more second engagement members are configured to cooperate with one another in a slidable relationship, such that a length of each of the left- and right-thigh supports is adjustable.