Described herein are various improvements to mobility devices. These improvements include, for example, adjustable lateral body supports, multi axial supports for accommodating movement of the pelvis during walking, frame folding assemblies for accommodating storage and transportation, detachable support couplings for supportive accessories, foldaway footplate assemblies for allowing users to rest, wheel brake systems, caster wheel systems, suspension support systems, control button assemblies, and center of gravity adjustment assemblies. One or more these improvements can be combined into various mobility devices as will be described in more detail hereinafter.

An anti-pushback mechanism for a wheelchair provides for a side mounted lever to allow the wheelchair to move in a forward motion only, a rearward motion only, or a neutral position where it can be pushed in any direction. This lever is connected to a ratcheting style gear that stops rollback when engaged. A torsion spring moves the chair forward slightly as the user stands to keep the chair close to the user and prevent falling. The invention may be provided as an add-on kit for existing wheelchairs. The kit would consist of a center axle, the ratchet gear, the torsion spring, the crossbar frame, the actuating lever, a guard for the lever, and any associated clamps and fasteners.

A wheelchair comprises a frame and two main wheels each coupled to a hand rim for actuating the wheels in both directions of rotation and for braking.

In a power transmission mechanism 20, a line connecting a center shaft 21 of a reference gear member 40 and a first shaft 44 of a first planetary gear member 42 and a line connecting the center shaft 21 of the reference gear member 40 and a second shaft 47 of a second planetary gear member 45 form a specific angle α. Rotation in one direction is prevented when a first carrier member 22 and a second carrier member 32 are relatively rotated in a direction to decrease the specific angle α. Further, a rotation prevention release unit is provided to release a prevention state of the rotation when the first carrier member 22 and the second carrier member 32 are relatively rotated in a direction to increase the specific angle α.

A wheel-at-rest automatic brake system including a base, a cam, two reset brackets and an interlocking gear is installed in a wheel hub and connected to a wheel shaft of the wheel hub. The base is installed in the wheel hub and has multiple mounting holes and three first pivot holes; the cam is hinged to the first pivot hole and has a protrusion and two driving portions; the two reset brackets are pivoted to the remaining two first pivot holes; each driving portion has a limit notch; the interlocking gear is fixed to the wheel shaft and engaged to the protrusion; and the two driving portions are situated in the two limit notches to define a locked state. When moving, the interlocking gear drives the protrusion to deflect, and the two driving portions prop the two reset brackets up to define a released state.

A brake assembly has a wheel body, a first stopping device, and a second stopping device. The wheel body has a central axle and two engaging portions formed respectively on two ends of the central axle. The first stopping device is connected with the engaging portions of the wheel body and has a resilient member and a magnetic unit. The resilient member is C-shaped and has a lateral rod and an inclined rod connected integrally with an end of the lateral rod. The magnetic unit is mounted on the lateral rod of the resilient member and has a sleeve having a bottom opening and a magnetic element mounted in the sleeve and selectively abutting the wheel body. The second stopping device is connected securely with the lateral rod of the resilient member and is engaged selectively with the engaging portions of the wheel body.

A wheel-at-rest automatic brake system including a base, a cam, two reset brackets and an interlocking gear is installed in a wheel hub and connected to a wheel shaft of the wheel hub. The base is installed in the wheel hub and has multiple mounting holes and three first pivot holes; the cam is hinged to the first pivot hole and has a protrusion and two driving portions; the two reset brackets are pivoted to the remaining two first pivot holes; each driving portion has a limit notch; the interlocking gear is fixed to the wheel shaft and engaged to the protrusion; and the two driving portions are situated in the two limit notches to define a locked state. When moving, the interlocking gear drives the protrusion to deflect, and the two driving portions prop the two reset brackets up to define a released state.

A motorized accessory for a wheelchair includes a housing having a top end and a bottom end, a handlebar assembly secured to the top end of the housing, and a wheel assembly coupled to the lower end of the housing. The motorized accessory also includes an electric motor coupled to the wheel assembly that is configured to drive the wheel assembly. In addition, the motorized accessory includes a tow bar assembly having a proximate end coupled to the housing and extending outward to a free distal end, where the free distal end is configured to be removably coupled to the wheelchair. The motorized accessory is configured to latch to the manually driven wheelchair in order to convert the manually driven wheelchair into a motorized wheelchair.

A wheelchair comprises a frame and two main wheels each coupled to a hand rim for actuating the wheels in both directions of rotation and for braking.

A smart brake system for safety at movement on a slope, includes: a multi-brake which comprises a deceleration brake for working while moving on a descending slope and a ratchet brake for working while moving on an ascending slope; a brake controller which selectively controls one of the deceleration brake and the ratchet brake to work as buoyancy of fluid is varied depending on the movement on the descending or the ascending slope.