US Patent 7134678 Wheelchair

A wheelchair comprises a frame which supports the wheels, the seat, back rest, and foot rests of the wheelchair. The seat, the back rest, and the foot rests are adjustable in relation to one another. The frame comprises a lower and an upper frame section. On the lower frame section there are disposed the wheels of the wheelchair, and on the upper frame section there are disposed the seat, the back rest, and the foot rests. The wheelchair has an adjustment device for vertical adjustment of the upper frame section in relation to the lower.