The present invention relates to improvements in the design of a rear-steer collapsible, in particular the invention relates to a number of safety enhancing features that provide a safer and more versatile rear steer portable wheelchair.

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 wheelchair (100) includes a chassis (101) defining a seat (102), a backrest (103), one or more armrests (104,105), and an undercarriage (106). One or more front caster wheels (118,119) are coupled to, and selectively detachable from, the undercarriage. One or more rear wheel assemblies (120,121) each include a rear wheel (125), an axle (127), and a mounting post (129) extending distally from the axle at a substantially orthogonal angle relative to the axle. One or more quick release devices (130,131) couple each mounting post of each rear wheel assembly to the undercarriage such that the each the one or more rear wheel assemblies is selectively detachable from the undercarriage.

A folding wheelchair with an excretion device has an opening at a center of a seat for engagement with an excretion device. The excretion device includes two movable boards with soft pads thereon for placement in the opening when the movable boards are closed, two corresponding operate units, each arranged from a bottom surface of one of the movable board to a side thereof for operation, and a container bag for taking excrement.

A manual wheelchair including a collapsible frame having a first lateral member that is connected to first and second braces at their respective first ends. A drive wheel axel extends along a first axis of rotation and engages a drive wheel, the first brace, and a portion of a transmission. A push rim axel extends along a second axis of rotation and engages a push rim wheel, the second brace, and a portion of the transmission, which transmits rotation of the push rim to rotation of the drive wheel. The collapsible frame additionally includes a second lateral member that is connected to the first and second braces as their respective second ends. The first and second braces are configured to release the second lateral member to collapse the manual wheelchair.

A wheelchair having a seating portion and an underlying support portion, with a storage space formed between the seating portion and the support portion. The support portion extends outwardly relative to the seating portion from a handle portion and defines an operation space. A detachable motor unit is provided for driving the movement of the wheelchair. The storage space transitions between an expanded state and a folded state through adjustment of the seating portion and the support portion.

A walker includes first and second side frames configured to collapse laterally toward one another from an unfolded configuration to a folded configuration. The walker includes a seat extending between and supported by the first and second side frames, and a folding mechanism positioned underneath the seat and acting independently of the seat.

Disclosed is a folding wheelchair having a plurality of support members each having a first and a second end, a first separation distance measured between the respective first ends of a second support member and a fourth support member, a second separation distance measured between the respective second ends of the second support member and a fourth support member, a third separation distance measured between the respective first ends of the first support member and the third support member, wherein the wheelchair can be disposed in an open position and a folded position and, in the open position, the first separation distance is shorter than the second separation distance, the first separation distance is shorter than the third separation distance, and the second separation distance is shorter than the third separation distance. An intersection angle of the second and fifth support members is less than 55 degrees.