Wheelchair (10) with two independent driving arms (21, 21), comprising a seat (16), two rear large wheels (12, 13) and two front small wheels (14), wherein the small wheels (14) can be freely turned around a vertical axis, and a common frame (11) for holding the listed parts, and the two driving arms (21, 21) are fixed to the frame (11) by means of respective pivot bearings (25) which are fixed at a low position close to the place where the small wheels (14) are attached to the frame (11), and the driving arms (21, 21) extend till a height which is sufficiently high for the person sitting in the wheelchair (10) to hold their upper end portions easily with hands and to move them in forward-backward directions around the respective pivotal bearings, and both of the large wheels (12, 13) are equipped with respective brakes that can be operated by the driving arms (21, 21) or by respective brake handles (42) positioned on the driving arms (21, 21), and to respective lower sections of the driving arms (21, 21) respective ropes (32, 32) are connected, and the two large wheels (12, 13) comprise respective wheel hubs (30, 30) each equipped with freewheel, and to one side of each wheel hub (30, 30) a respective one of rope drums (31, 31) is attached, the rope drums (31, 31) are each provided with a spring bias, and a winding made of said rope (32, 32) comprising a predetermined number of turns is provided on the mantle of each rope drum (31, 31), wherein a predetermined displacement length of the pulling of the rope (32, 32) in forward direction results in a given turning of the associated wheel hub (30, 30) in forward direction, and when the rope drum (31, 31) is turned in the other direction the freewheel releases the connection towards the large wheel (12 or 13), and the wheel hub (30, 30) comprises a release mechanism that releases the locking of the freewheel when the large wheel (12 or 13) is moved in backward direction and backward movement gets allowed.

Provided is a wheelchair that can be easily operated with either a right or left hand. The wheelchair according to the present invention is provided with: a right-left pair of first handrims connected to handrim spokes; a right-left pair of second handrims connected to spokes; a first rotary shaft for transmitting a first rotational force generated by rotation of the left first handrim to a right wheel; and a second rotary shaft for transmitting a second rotational force generated by rotation of the right first handrim to a left wheel, wherein a first power transmission device on a right inner shaft of a right drive mechanism meshes with a second power transmission device on the second rotary shaft, and a third power transmission device on a right outer shaft of the right drive mechanism meshes with a fourth power transmission device on the first rotary shaft.

Provided are modular mobility systems that can be used as gait trainers, wheelchairs, and/or standing aids. Modular mobility systems provided comprise a mobility base, a gait trainer module, a wheelchair module, and/or a standing aid module. Modular mobility systems provided herein are designed to adjust to users of different sizes and of different abilities and/or needs.

A manual wheelchair including a collapsible frame with at least one brace connected to at least one of the frame members. 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 at least one brace is configured to release the at least one of the frame members to collapse the wheelchair.

A puncture resistant wheel apparatus, and method of use, for safely climbing obstacles are disclosed herein. A plurality of wheel apparatuses is mounted on a vehicle (e.g. a wheelchair, cart, mountain bicycle, etc.) to enable it to safely traverse obstacles, such as a flight of stairs, road curbs, etc. without slipping, and while creating a smoother ride. Each wheel apparatus comprises: a tire comprising a plurality of teeth sections separated via a thin space to grip an obstacle edge between the teeth; a circular rim attachable to the tire inner surface via T-joints, and a plurality of evenly spaced spokes extending to a central hub; and two hoop rings, mounted on opposing tire sidewalls. The center of each tire tooth section further comprises an elastic unit, comprising a vertical spring and two horizontal springs that further act to dampen the vibrational and jarring forces exerted on the wheel apparatus.

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 about parallel pivot axes in the side frames, and an axis of rotation of 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, wherein the wheelchair has guide levers and each guide lever is mounted in the respective strut of the cross-strut assembly between the axis of rotation of the struts of the cross-strut assembly and the respective seat tube, and the guide lever is mounted at a distance therefrom in the side frame assigned to the seat tube so as to be pivotable about a pivot axis that is arranged parallel to the pivot axes of the cross-strut assembly.

Disclosed is a manual wheelchair having a rotating seating area thereby providing a gradation of seating options between an upright and a tilted position. The rotation of the seating area of the disclosed wheelchair from an upright to a tilted position is independent of the position of provided push handles.

A wheelchair (1) is described which has two large propulsion wheels (5) for manually propelling the wheelchair, and a steering arrangement comprising a steering bar (8) on which are mounted smaller wheels (6). The small wheels may be free pivotable, as castors, or they may be locked by locking pins (12). A back-rest (4) can be tilted or rotated in a lateral plane about an axis (4) by the user leaning his or her upper body to the left or the right. Movement (19) of the back-rest is transmitted by lever (20) and Bowden cable (21) to the steering bar (8). In this manner, the wheelchair (1) may be steered by the user leaning to the left or right.

A wheelchair with a ratchet/pawl drive system comprising a seat back, a seat bottom, a frame, two mounting brackets, two car guide tracks, two front wheel assemblies, two car assemblies, two brake assemblies, two drive wheels, and two wheelchair wheels. The ratchet/pawl drive comprises at least one drive wheel sprocket, at least one ratchet/pawl assembly, at least one forward-neutral-reverse lever and at least one brake assembly. The ratcheting/pawl drive system may be included in a novel wheelchair or may be integrated into existing standard wheelchairs as a retrofit kit.

The disclosure provides an assist wheel including a wheel, a handrim, an elastic component, two contact components, a driving assembly, two film sensors. The wheel is configured to be rotatably disposed on a wheelchair frame. The handrim is disposed on the wheel and rotatable with respect to the wheel. Two opposite ends of the elastic component are respectively connected to the wheel and the handrim. The two contact components are respectively disposed on the wheel and the handrim. The driving assembly is configured to be fixed to the wheelchair frame. The two film sensors are disposed on the driving assembly and respectively pressed by the two film sensors. Each of the two film sensors is configured to generate a sensor value. The controller is configured to receive the sensor values from the two film sensors and signal the driving assembly.