A wheelchair is provided which includes a body, and driving wheels arranged on the both sides of the body. The wheels include a rim portion, a hub portion, an hand rim, and fastening members. A tire is attached to the outer peripheral part of the rim portion. The hub portion is arranged at the center of the rim portion and coupled to the rim portion by connecting members. The hand rim is arranged along the rim portion on the exterior side of the rim portion. The fastening members fasten the hand rim to the rim portion. An insertion prohibition spacing is formed between the rim portion and the hand rim. The spacing has a distance capable of prohibiting insertion of user's thumb into this spacing.

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 is provided which includes link rods that intersect each other in an X shape, and are pivotably coupled to each other by a pivot shaft. The link rods include a rod central part, and rod upper and lower parts. The rod central parts hold the pivot shaft. The rod upper and lower parts and slant from first and second inclined parts on the both ends of the rod central part in opposite directions with respect to the rod central part. When the X-link portion is folded, the rod central parts overlap each other and are aligned in one straight line in the vertical orientation, and frame accommodation space portions which can accommodate the middle frame portions are provided on the both sides of the rod central parts.

The present invention provides an assembly having a collapsible wheelchair and an anti-rollback assembly to brake rotational movement of the wheelchair when a user is unseated, while simultaneously maintaining the ability of the wheelchair to collapse into a storage configuration. The anti-rollback assembly may include a brake bar pivotable between a lock state and an unlock state, a biasing member engaging the brake bar to exert a biasing force to move the brake bar into the lock state, and an actuator configured to engage a seat surface of the wheelchair to move the brake bar into the unlock state when the individual occupies the seat surface.

A multi-mode wheelchair includes a frame, two front wheels, two rear wheels and two driver units. The frame includes an intermediate unit for interconnecting two side units. The intermediate unit is movable between a collapsed position and an extended position. The front wheels are connected to the side units. The rear wheels are connected to the side units. The driver units are connected to the side units. Each of the driver units includes a motor located in a corresponding one of the rear wheels and a brake operable to stop the motor. The driver units are located between the rear wheels. A distance between the driver units is larger than a breadth of a user when the intermediate unit is in the extended position.

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 drive mechanism for a wheelchair may include a hand grip having a continuous track that moves over a drive rotator. The hand grip may have a flat, top surface that extends ventrally from the wheelchair. The drive mechanism may include a drivetrain connected to the drive rotator, such that movement of the hand grip in a dorsal or a ventral direction causes the drive rotator to rotate, and such rotation actuates the drivetrain. The drive mechanism may further comprise a switch. When the switch is in a first position, actuation of the drivetrain drives the wheels of the wheelchair. When the switch is in a second position, actuation of the drivetrain drives a mechanism that lifts the wheelchair into a standing position.

An electric wheelchair with quick-release drive wheels includes: a chassis, and two guide wheels and two said drive wheels. The drive wheels are rotated by a drive mechanism and connected to the drive mechanism by a quick-release mechanism. To detach the drive wheel, the user can press the cover to make the rolling balls move out of the receiving groove and back to the arc-shaped engaging portion, which allows the hollow shaft to disengage from the drive shaft. Then, keeping pressing the cover can detach the drive wheel from the drive mechanism. To assemble the drive wheel, the user can press the hollow shaft into the axial hole to make the rolling balls engage in the receiving groove, so that the drive wheel is assembled to the drive mechanism. The assembly and disassembly of the drive wheel require no wrenches or other tools, and therefore are very convenient.

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.