Provided is a wheelchair that can be easily operated with either a right or left hand. The wheelchair according to the present invention is provided with: a right-left pair of first handrims connected to handrim spokes; a right-left pair of second handrims connected to spokes; a first rotary shaft for transmitting a first rotational force generated by rotation of the left first handrim to a right wheel; and a second rotary shaft for transmitting a second rotational force generated by rotation of the right first handrim to a left wheel, wherein a first power transmission device on a right inner shaft of a right drive mechanism meshes with a second power transmission device on the second rotary shaft, and a third power transmission device on a right outer shaft of the right drive mechanism meshes with a fourth power transmission device on the first rotary shaft.

A technique for capturing a three-dimensional digital image of a customized shape for a wheelchair seat and back and subsequently producing a seat and back from the image. The captured image may include one or more datum points therein to provide a reference plane for the seat and back. The datum points may be in a color-coded layer located relative to the bottom edge of the seat. The color code may indicate the size of the user and seat at a coarse level. The customized shape may be captured from a shape capture bag or bags that capture one or both of the shape of the user's back and bottom. The shape capture bag used to capture the shape of the user's bottom, for use in manufacturing the seat, may be enhanced by a pre-formed layer that contains a contour or one or more components that together form a contour that biases the shape capture bag toward the shape of the user's bottom when gravity is acting upon the user to sink into a cushioned seat.

Provided is a wheelchair that can be easily operated with either a right or left hand. The wheelchair according to the present invention is provided with: a right-left pair of first handrims connected to handrim spokes; a right-left pair of second handrims connected to spokes; a first rotary shaft for transmitting a first rotational force generated by rotation of the left first handrim to a right wheel; and a second rotary shaft for transmitting a second rotational force generated by rotation of the right first handrim to a left wheel, wherein a first power transmission device on a right inner shaft of a right drive mechanism meshes with a second power transmission device on the second rotary shaft, and a third power transmission device on a right outer shaft of the right drive mechanism meshes with a fourth power transmission device on the first rotary shaft.

A back support for use with a chair includes a first support, a second support spaced from the first support, and an adjustable support extending between the first and second supports, the adjustable support includes a cable and an adjustable tensioning assembly operably connected to the cable, wherein in response to actuation of the adjustable tensioning assembly a length of exposed cable changes.

This wheelchair propulsion and steering device enables wheelchair individuals with only one functional arm to drive a wheelchair. Further it enables two handed people stronger and better controlled use of a wheelchair.

A technique for capturing a three-dimensional digital image of a customized shape for a wheelchair seat and back and subsequently producing a seat and back from the image. The captured image may include one or more datum points therein to provide a reference plane for the seat and back. The datum points may be in a color-coded layer located relative to the bottom edge of the seat. The color code may indicate the size of the user and seat at a coarse level. The customized shape may be captured from a shape capture bag or bags that capture one or both of the shape of the user's back and bottom. The shape capture bag used to capture the shape of the user's bottom, for use in manufacturing the seat, may be enhanced by a pre-formed layer that contains a contour or one or more components that together form a contour that biases the shape capture bag toward the shape of the user's bottom when gravity is acting upon the user to sink into a cushioned seat.

Embodiments herein relate to a wheelchair gearshift arrangement (10), which comprises an axle tube (20) and a pair of wheel attachment adaptors (30) inserted into a respective end (21, 22) of the axle tube (20). The wheel attachment adaptors (30) further includes a respective axle sleeve (40) adapted to receive and hold a respective wheel axle (51) of a respective complete wheelchair wheel (50). Each complete wheelchair wheel (50) having a respective wheel axle centric, axially translatable, gear change mechanism (52). One or more gear change actuators (80) are arranged within the axle tube (20) such that they are operative to selectively, upon user manipulation of an associated gear selector (60), axially translate the associated gear change mechanisms (52) of the respective complete wheelchair wheels (50). Such translation will affect a change of gear ratio between a push-rim (55) and wheel-rim (56) of each respective complete wheelchair wheel (50).

A back support for use with a chair includes a first support, a second support spaced from the first support, and an adjustable support extending between the first and second supports, the adjustable support includes a cable and an adjustable tensioning assembly operably connected to the cable, wherein in response to actuation of the adjustable tensioning assembly a length of exposed cable changes.

The disclosed adjustable backrest provides a plurality of generally horizontal straps arranged from the top to the bottom of the rigid back shell to provide anterior to posterior support and comfort for a patient. Generally speaking, the generally horizontal straps provide variably adjustable tension straps that allow for precise positioning of the patient to reduce or remove pressure points from the patient's thoracic to sacrum region.

The disclosed adjustable backrest provides a plurality of generally horizontal straps arranged from the top to the bottom of the rigid back shell to provide anterior to posterior support and comfort for a patient. Generally speaking, the generally horizontal straps provide variably adjustable tension straps that allow for precise positioning of the patient to reduce or remove pressure points from the patient's thoracic to sacrum region.