A chassis structure for an electric power wheelchair adapted for a seat frame to be mounted and supported thereon includes a chassis housing which defines an accommodation space, and an upper cover which covers an upper opened end of the accommodation space. At least one modular raising strip assembly is removably sandwiched between the chassis housing and the upper cover and has a predetermined thickness such that a volume of the accommodation space is increased with the raising strip assembly. With the modular raising strip assembly, the volume of the accommodation space is adjustable according to the battery capacity of a battery pack of a drive unit which is mounted in the accommodation space to meet the user's requirement.

The invention concerns a wheelchair for assisting walking. The wheelchair comprises a chassis, a movable base that can move relative to the chassis between a low seating position and a high walking position, and a device for changing the position of the base. The device for changing the position comprises at least a first arm and a linear actuator. The arm forms a third-class lever. The linear actuator is configured to bias the movable base towards the high position by means of the arm.

The invention concerns a wheelchair for assisting walking. The wheelchair comprises a chassis, a movable base that can move relative to the chassis between a low seating position and a high walking position, and a device for changing the position of the base. The device for changing the position comprises at least a first arm and a linear actuator. The arm forms a third-class lever. The linear actuator is configured to bias the movable base towards the high position by means of the arm.

A device including a frame; an actuator attached to the frame and slidaby movable with respect to the frame along a linear axis, and a helical member positioned within the frame and rotatably movable with respect to the frame about a helical axis of the helical member, wherein the helical axis is parallel to the linear axis, wherein the actuator and the helical member are configured to cooperate with one another such that (a) motion of the actuator along the linear axis in a first linear direction causes corresponding rotation of the helical member about the helical axis in a first rotational direction and (b) motion of the actuator along the linear axis in a second linear direction that is opposite the first linear direction causes corresponding rotation of the helical member about the helical axis in a second rotational direction that is opposite the first rotational direction.

Various implementations include a wheelchair traction attachment device. The device includes a frame having an arcuately-shaped longitudinal axis, an inner surface, an outer surface opposite and spaced apart from the inner surface. The frame has a first edge extending between the inner and outer surfaces, and a second edge spaced apart from the first edge. At least a portion of the inner surface defines a channel. The device includes at least one first wheel-clip extending radially inwardly from the first edge of the frame relative to the arcuately-shaped longitudinal axis. The device includes at least one second wheel-clip extending radially inwardly from the second edge of the frame relative to the arcuately-shaped longitudinal axis. The device includes a traction portion disposed along at least a portion of the outer surface, the traction portion extending radially outwardly from the outer surface relative to the arcuately-shaped longitudinal axis.

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.

Systems and methods of wheelchair systems enabling fine manual motion control are disclosed. In one embodiment, a wheelchair system includes a wheelchair. The wheelchair includes one or more wheels, at least one actuator coupled to the one or more wheels, a processing device, and a non-transitory, processor-readable storage medium in communication with the processing device. The non-transitory, processor-readable storage medium includes one or more programming instructions that, when executed, cause the processing device to determine a wheel torque on the one or more wheels, determine a compensation value, and actuate the at least one actuator applying the compensation value to the one or more wheels to remove at least a portion of the wheel torque such that less external force is required to physically move the powered wheelchair than when the compensation value is not applied.

A warming device for the handrim of a wheelchair is disclosed herein to relieve discomfort caused by manually wheeling a wheelchair in cold and/or wet weather conditions. The warming device includes a hand interface, a mount, and a heating element. The warming device is configured to mount the tube of a handrim. The heating element of the warming device is coupled to an electronics system including a printed circuit board and a battery. The electronics system may be internal to the warming device, or may be housed in an external electronics box mounted similarly to the handrim or the rear wheel of the wheelchair.

Disclosed is a multifunctional exercise chair for body stretching, comprising a wheelchair frame body, wherein a mounting frame is detachably mounted on an end of the wheelchair frame body away from the driving rear wheel and located under the seat cushion, a pedal gear is rotatably mounted at a bottom of the mounting frame and a pedal is provided thereon, a hand crank gear is rotatably mounted on a top of the mounting frame and a hand crank handle is provided thereon, a rotating shaft is provided between two driving rear wheels; a driven gear is fixedly mounted on the rotating shaft, a supporting chain gear is mounted on the mounting frame and arranged adjacent to the pedal gear, and the hand crank gear, the pedal gear, the driven gear and the supporting chain gear are wound and connected by a transmission chain.

An assisted standing and walking device for a user with at least one side paralysis or weakness is provided with provisions for assisted transitioning of the user from a seated position to a standing position prior to walking in the assisted standing and walking device with user friendly attachment and release with controlled limitation of lateral gait movement that occurs in lateral walking gait motion.