A lifting mechanism has a base to which a pivot of a parallelogram structure. A spring extends from a first link of the parallelogram to an adjustable termination point on a second link of the parallelogram to form a lifting triangle. The spring termination point is displaced from a main pivot of the parallelogram to create an adjustable lever arm to vary the lifting force. A lifting power adjustment mechanism adjusts the position of the spring termination point. An extension is in fixed relation to one of the parallelogram links and maintains its angle with respect to the horizontal when angles of the parallelogram are varied upon raising or lowering the lifting mechanism between a sitting mode and a standing mode. The extension serves as a base for a rear seat section. A front seat section is pivotally attached to the rear seat section allowing it to swing downward upon elevation of the liftin mechanism.

A folding electric wheelchair that provides the user an electronic driving system powered by two lithium-ion batteries that is sealed to be weatherproof, able to drive over different terrain types and slope grades on any given day whether it's raining or sunny, lightweight and portable for transportation, travel-friendly, compact in overall size when in the folded position to fit into a small space for storage. An ergonomically contoured seating that includes a bump dampening and terrain vibration system with the supporting frame pieces (34), (42), and (50) having an oval shape. The manner of how the embodiment operates to fold and unfold consists of eight specific hinge joint embodiments including: (30), (32), (38), (40), (46), (48), (58) and (64).

A wheelchair incorporated with a lift apparatus is disclosed. The wheelchair comprises a pair of seat frame support bars, backrest support bars, and armrest frame support bars for supporting at least one seat cushion, backrest cushion, and armrest cushions. The wheelchair further comprises lower support bars positioned parallel and opposite each other on both sides of the wheelchair. The support assembly includes a plurality of scissor links pivotally connected to each other, and an end of the plurality of scissor links is pivotally affixed with needle bearings to the lower support bars and the seat frame support bars. The lift apparatus includes one or more actuators, positioned between the lower support bars and at least one scissor link on both sides. The actuators are configured to raise and lower the seat cushion by raising at least one scissor link, thereby raising and lowering the seat cushion to a desired adjustable height for the user.

A multi-purpose wheelchair is disclosed herein. The wheelchair comprises a tubular frame having two support members pivotally mounted and extending upwardly from the tubular frame. The wheelchair also comprises four legs pivotally mounted and extending downwardly from the tubular frame. The wheelchair comprises further four wheels arranged such that one wheel is provided with each of the legs. The wheelchair also comprises a split-seat with an opening supported on the base. Further, the wheelchair comprises a back support extending between the two support members.

A rollable user-support device comprising a rigid frame with first legs and second legs, each with a rollable and swivelable wheel, a seat with a seat folding mechanism and/or a seat manipulation mechanism. The seat manipulation mechanism can be operable to move the seat, with a user seated thereon, between a lower rearward seating position and an elevated forward seating position, and the seat folding mechanism can be operable to move the seat between the elevated forward seating position and a folded position, at least one of the devices being connected to a swivel prevention mechanism associated with the first wheels. The device can constitute a bi-directional rollable user-support device operable in three modes.

A rigid frame wheelchair of a box frame design includes a base frame which has a rear axle for receiving rear wheels and a left-hand side strut and a right-hand side strut for receiving steering wheels in the front regions of the side struts, an L-shaped seat-foot support frame having an L-shaped left-hand strut and an L-shaped right-hand strut, wherein each L-shaped strut has a seat tube segment and a foot support tube segment, and wherein the seat-foot support frame further has a transverse strut that connects the L-shaped struts, two coupling units that connect together in an articulated manner the base frame in the left-hand and right-hand front region to the seat-foot support frame in the region of the left-hand and right-hand foot support tube segments about an axis vertically to a sagittal plane for an angular adjustment, and wherein the foot support tube segments are adjustably mounted for a seat height adjustment, a left-hand frame connector and a right-hand frame connector, wherein the frame connectors fixedly connect together the base frame and the seat tube segments, and wherein the seat tube segments are configured to be connected to the frame connectors in various positions.

In such a wheelchair the adjustment of the seat height and the seat angle is able to be carried out with low material use and reduced operating effort.

A rollable user-support device comprising a rigid frame with first legs and second legs, each with a rollable and swivelable wheel, a seat with a seat folding mechanism and/or a seat manipulation mechanism. The seat manipulation mechanism can be operable to move the seat, with a user seated thereon, between a lower rearward seating position and an elevated forward seating position, and the seat folding mechanism can be operable to move the seat between the elevated forward seating position and a folded position, at least one of the devices being connected to a swivel prevention mechanism associated with the first wheels. The device can constitute a bi-directional rollable user-support device operable in three modes.

An auxiliary frame system for a wheelchair, the wheelchair having a frame comprising two openings to releasably attach axle portions of rear wheels and defining between them a main rear wheel axis; wherein the auxiliary frame system comprises: a pair of wheel displacing elements; fastening elements to releasably attach each wheel displacing element to the frame of the wheelchair through the openings; wheel holders for bearing respective rear wheels of the wheelchair, wherein each of the wheel holders is associated with a respective wheel displacing element, and the wheel holders define between them a shifted rear wheel axis; at least one anchoring link to releasably secure at least one of the wheel displacing elements to the frame of the wheelchair at an additional attachment point. Also provided are wheelchairs comprising such auxiliary frame system and methods to displace the position of rear wheels of a wheelchair.

A modular linking system provides a positioning and supporting structure for mounting various components, particularly on a wheelchair structure. A wheelchair kit includes such a modular linking system and further wheelchair includes at least one modular linking system or at least one wheelchair kit.

A chair is disclosed having a chair frame and a seating surface having a first side surface movably coupled to the frame, and a second side surface coupled to the frame. The first side surface is independently moveable relative to the second side surface. Each of the first side surface and the second side surface define a front end of the seating surface and a back end of the seating surface. A first actuator is coupled to the frame, where the first actuator is configured for operative communication with the first side surface.