Patent ID: 9737448
Date: 2017-08-22
CPC Classifications: A61G

Claim:
1. A wheelchair apparatus comprising: an upper unit including a structural frame and a generally horizontal seat mounted on the frame, the upper unit having a lowered position and a raised position, wherein the seat remains generally horizontal from the lowered position to the raised position; a lower unit including a structural frame with a front portion and a rear portion, a rear ground wheel assembly including a pair of rear ground wheels attached to the rear portion of the structural frame and a front ground wheel assembly including a pair of front ground wheels attached to the front portion of the structural frame; a vertical lift system coupling the upper unit to the lower unit and operable to lift the upper unit from the lowered position to the raised position; and a manual propulsion system supported on the upper unit and coupled to the rear ground wheel assembly which enables a user sitting in the seat to rotate the rear ground wheels with the upper unit in the lowered position and in the raised position.