Patent ID: 7100718

Claim:
A self-propelled wheelchair, comprising: a frame supporting a seat, two drive wheels mounted to the front of said frame, a prime mover mounted to said frame so as to drive said two drive wheels, and at least one castor wheel mounted to the rear of said frame and pivotal about a substantially vertical axis, said frame is height adjustable in such a manner that when said frame is lowered, said seat is simultaneously tilted backwardly, said frame is provided with an anchoring mechanism which allows said wheelchair to be releasably anchored to an anchoring element secured to the floor, said anchoring element comprises at least one anchoring projection which projects upwardly therefrom and is adapted to engage with said anchoring mechanism when said frame is moved downwardly and laterally restrained by forward movement of the wheelchair, wherein the anchoring mechanism further comprises a locking pin mechanism, mounted on the side of said frame, said locking pin mechanism having a retractable locking pin biased to automatically enter a locking aperture when said anchoring mechanism is brought into engagement with said anchoring element, and said locking pin may be retracted by an operation performed by a poison seated within said wheelchair.