This document describes accessory devices for wheelchairs. For example, this document describes wheelchair accessory devices that include a wheel and foot pedals so that a wheelchair user can use his/her legs to propel the wheelchair by pedaling.

Provided is a wheelchair that can be operated easily with either a right or left hand. The wheelchair is provided with; right and left handrims; a rotary shaft for transmitting a rotational force generated by a handrim on one side to a wheel on the opposite side via a drive mechanism; and a wheel hub for transmitting the rotational force generated by the handrim on the one side to the wheel on the same side via the drive mechanism, wherein the drive mechanism includes two pairs of right and left sensors respectively disposed on an outer surface of each of the handrims, a first non-excitation electromagnetic clutch for transmitting the rotational force to the right wheel, a second non-excitation electromagnetic clutch for transmitting the rotational force to the wheel on the opposite side, and a third non-excitation electromagnetic clutch for transmitting the rotational force to the left wheel.

A conveyance to carry humans, such as a wheelchair, is described having levers on each side of the wheelchair that are manually moved forward and backward to propel the conveyance. The user is able to shift into forward, reverse or neutral, brake, and change mechanical advantage (gear ratio), all this without removing the user's hands from the drive levers.

This document describes accessory devices for wheelchairs. For example, this document describes wheelchair accessory devices that include a wheel and foot pedals so that a wheelchair user can use his/her legs to propel the wheelchair by pedaling.

A wheelchair having a frame and a drive wheel coupled to the frame. The drive wheel rotates relative to the frame about a first axis of rotation. A first push rim is coupled to the frame. The first push rim rotates relative to the frame about a second axis of rotation that extends substantially parallel to the first axis of rotation. A second push rim is coupled to the frame. The second push rim rotates relative to the frame about a third axis of rotation that extends substantially parallel to the first axis of rotation. A transmission transmits rotation of each of the first and second push rims to the drive wheel. Movement of the first push rim by a first arc length causes the drive wheel to rotate by a first angular displacement, and movement of the second push rim by the first arc length causes the drive wheel to rotate by a second angular displacement that is greater than the first angular displacement.

A rack driven human powered vehicle utilizes a rack and pinion system to provide a more efficient method of propulsion. The rack and pinion system may take the linear momentum of at least one driving rack and may transfer it to rotational momentum for at least one freewheel sprocket which may turn the wheel providing momentum for the vehicle.

Provided is a lightweight and inexpensive wheelchair that can be easily operated with either a right or left hand. The wheelchair according to the present invention is provided with; a pair of handrims having a first portion connected to each handrim spoke and a second portion connected to a base of each wheel; a drive mechanism for transmitting a first rotational force generated by the first portion on one side and/or another side to the wheel on the one side and the wheel on the other side, wherein the drive mechanism includes an axle on the one side, an axle on the other side connected to the axle on the one side via a rotary shaft, a first two-way clutch located on the axle on the one side, and a second two-way clutch located on the axle on the other side.

The invention relates to a mechanical wheelchair drive, comprising a rotatably mounted lever, a handle fastened to the lever, and a force transfer unit for transferring rotational motion of the lever to a wheelchair wheel, wherein the lever has a variable length and is guided along a closed guide of a guide plate, said guide deviating from the circular form, such that the length of the lever changes during the rotational motion.

A wheelchair device for actively moving a seat unit, in particular a seat part and/or a backrest part of the seat unit, of a wheelchair, has at least one movement conversion unit which is arrangeable at least in part on at least one drive wheel of the wheelchair and which is provided for the purpose of converting a movement of the at least one drive wheel into a movement of the seat unit.

Provided is a lightweight and inexpensive wheelchair that can be easily operated with either a right or left hand. The wheelchair according to the present invention is provided with; a pair of handrims having a first portion connected to each handrim spoke and a second portion connected to a base of each wheel; a drive mechanism for transmitting a first rotational force generated by the first portion on one side and/or another side to the wheel on the one side and the wheel on the other side, wherein the drive mechanism includes an axle on the one side, an axle on the other side connected to the axle on the one side via a rotary shaft, a first two-way clutch located on the axle on the one side, and a second two-way clutch located on the axle on the other side.