There is described a bariatric wheelchair, in particular a manual wheelchair, that includes a wheelchair chassis, a seating area provided on the wheelchair chassis, a backrest supported onto the wheelchair chassis, as well as front wheels and rear wheels provided on the wheelchair chassis to allow wheeling of the wheelchair. The backrest exhibits a lower backrest portion supported onto the wheelchair chassis, next to the seating area, the seating area and lower backrest portion having a first width (W1) that is selected to accommodate a wheelchair user's nominal hips width (WH) ranging between 500 millimeters and 800 millimeters. The backrest further exhibits an upper backrest portion, in the vicinity of the wheelchair user's shoulders, having a second width (W2) that is smaller than the first width (W1), which second width (W2) is selected to liberate space for movement of the wheelchair user's arms and shoulders and so as not to exceed a wheelchair user's nominal shoulder articulation width (WS) ranging between 400 millimeters and 600 millimeters.

There is described a wheelchair, in particular a manual wheelchair for bariatric or heavy-duty use, that includes a wheelchair chassis, a seating area, a backrest, as well as front wheels and rear wheels, said backrest having a backrest frame supported onto the wheelchair chassis. The wheelchair further includes a rolling support structure forming an integral part of the wheelchair, which rolling support structure is mounted on a rear portion of the wheelchair to support the wheelchair in an upright position in which the wheelchair is tilted back and is supported by the rolling support structure to allow displacement of the wheelchair in the upright position. The rolling support structure includes at least three, in particular four, rolling elements providing rolling support for the wheelchair in the upright position. The rolling elements preferably provide omnidirectional rolling support for the wheelchair in the upright position, and may in particular be ball casters

Embodiments herein disclose an extended wheel chair having a wheel chair and an attachment device. The wheel chair comprises a body having each of first body part and a second body part mounted over a frame on the wheel chair. The second body part comprises at least two pins and a flat plate. The wheel chair further comprises an attachment device to be mechanically locked to the body of the wheel chair. The attachment device comprises of a body provided with each of a first slot and a second slot. First pin of the at least two pins is engaged with the first slot and a second pin of the at least two pins is engaged with the second slot.

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 tire cleaning mechanism for a wheelchair comprises a fixation portion, a tire cleaner assembly, and an activation assembly. The fixation portion is operable to fixate the tire cleaner assembly to a wheelchair frame. The tire cleaner assembly is operable to remove debris from a wheelchair tire and the activation assembly is operable to move the tire cleaner assembly between an engaged configuration whereby a portion of the tire cleaner assembly engages a wheelchair tire and a disengaged configuration whereby the tire cleaner assembly is substantially removed from the wheelchair tire. A first link is coupled between at least one of a fixation portion and the tire cleaner assembly, or between the activation assembly and the tire cleaner assembly.

A wheel assembly comprising a wheelchair wheel (5) and a backstop arrangement (10; 30; 70) configured to selectively engage and disengage a backstop function and comprising a backstop selector (15; 35; 75) and a backstop member (18; 38; 78), wherein the wheel (5) comprises an internal-gear wheel hub (11; 31; 71) comprising a number of internal gears (57, 58) and having an inner rotatable circumferential surface (13; 33; 73), and wherein the backstop member is configured to allow the inner circumferential surface to rotate in one direction and to prevent rotation in the opposite direction. The wheel assembly comprises further a gear-shift arrangement comprising a shift member (54), which is axially moveable within the internal-gear hub (31) to engage a specific gear of said number of internal gears (57, 58), and wherein the shift member (54) via a connector member (55) is operatively connected to the backstop selector.

A wheelchair system includes a wheelchair including a plurality of force sensors including at least three force sensors. A rigid seat pan is placed in contact with each the plurality of force sensors at a different position on the rigid seat pan so that the rigid seat pan does not contact the frame and forces on the rigid seat pan are transferred to the plurality of force sensors. Each of the plurality of force sensors is in communicative connection with a processor system. A memory system is in communicative connection and an interface system is in connection with the processor system and a user interface system in communicative connection with the processor system. Instructions stored on the memory system are executable by the processor system to determine a value of a variable related to a distribution of force on the rigid seat pan over time.

Wheelchair with two independent driving arms fixed to the frame by pivot bearings at a low position. The driving arms extend to a sufficient height for the user to hold their upper portions and to move them in forward-backward directions around the pivotal bearings. Ropes are connected to the lower sections of the driving arms. Two large wheels have wheel hubs equipped with freewheel, and each wheel hub have a rope drums attached with a spring bias, and a winding made of rope. Pulling a the rope in forward direction results in turning the wheel hub 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. The wheel hub comprises a release mechanism that releases the freewheel when the large wheel is moved in backward direction and backward movement gets allowed.

A wheelchair can comprise a frame and a plurality of wheels rotatably attached to the frame, and a motor coupled to the frame. A power source can be configured to power the motor. A drive shaft can be coupled to the motor. A first sprocket can be coupled to the drive shaft. A second sprocket can be configured to be rotationally fixed to a wheel of the plurality of wheels. A drive belt or chain can extend between the first sprocket and the second sprocket. An input device can be configured to receive an input from an operator and, in response to receiving the input, cause the motor to rotate.

A wheelchair can comprise: a frame comprising an upper portion and a lower portion that is coupled to the upper portion so that the upper portion is vertically adjustable with respect to the lower portion. A pair of drive wheels can be coupled to the frame. A plurality (e.g., a pair) of casters are coupled to the frame. Each caster can have a respective swivel axis. At least one caster of the plurality of casters can be configured to be locked to prevent swiveling about its respective swivel axis and unlocked to enable swiveling about its respective swivel axis.