Modular wheelchair

Details Modular wheelchair Modular wheelchair

1990-04-27

1993-01-05

Hill, Mitchell J.

Land vehicles

Wheeled

Occupant propelled type

280650, 180907, 297DIG4, B62M 114

Patent

active

051763931

ABSTRACT:
A modular wheelchair that may be rapidly assembled and disassembled includes an adjustable chassis for releasably attaching a wheel module and a seating module having a detachable leg rest module. The one-piece chassis is constructed from composite materials and has hollow or foam filled longitudinal sides and cross-bars connecting the sides, and two cantilevered or trussed forwardly extending arms which connect swivel castors. The sides include mounts for adjustably attaching the seat module at a selectable center of gravity and height. The composite materials of the arms provide shock and vibration protection and further provide a space behind the arms and beneath the seating assembly for storing and attaching optional equipment. The wheel assembly includes drive wheels constructed from composite materials, smaller travel wheels for traversing narrow openings, anti-tip wheels and wheel locks. the wheels may be composite or tensioned disk wheels that may be locked by wheel locks having a spring device for automatically opening or closing the lock. The wheels are removably attached within lateral recesses in the chassis sides by interchangeable wheel axle alignment plugs which receive the wheel axle and plug into the recesses. The interchangeable plugs define a variety of angled axle chambers to provide for pre-selection of camber angles for the wheel. The seating assembly includes a frame having two longitudinal side members and at least one cross-member secured to the sides at the front and rear of the frame, side rails for adjustably mounting to the mounts on the chassis, and a seat with a forwardly pivoting back rest. A leg rest module including a foot rest is adjustably mounted to the seating module and includes a leg rest clamping mechanism for clamping the leg rest at a fixed angular orientation relative to the frame. The leg rest may be rotated substantially 90 degrees in front of the wheelchair and substantially 90 degrees to a retraction position beneath the seat. The leg rest includes independently adjustable right and left foot rest plates to enable the length of each leg to be independently accommodated, and for independently adjusting the user's ankle angle. The leg rest may be removed for double amputees.

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