Abstract: A wheelchair frame for flexing to accommodate irregularities in the ground consists of a generally rectangular structure having side rails joined by front and rear cross members. One of the cross members is rigid, and receives the side rails through apertures which permit rotation of the side rails within the cross member. The second cross member consists of a tube in tube arrangement or other such coupling for permitting rotation of the cross member relative to the side rails. The rigid cross member may be slidably displaced along the side rails for changing the wheelbase of the wheelchair. A wheelchair seat from may be mounted to the rectangular frame by means of fore and aft struts which permit movement of the seat frame relative to the lower rectangular frame to accommodate flex of the lower frame, while also providing a tilt function for the seat frame.

Abstract: The device is a footrest support structure for attachment to the frame of a wheelchair. A footrest is carried on the end of a telescoping leg pivotally engaged to a wheelchair frame. The telescoping leg automatically extends as it is elevated, by means of a folding link that engages the two parts of the leg. The link is engaged as well by a lever lock that permits the first arm to slide freely in a first direction but not in a second direction until the lock is actuated. The first arm of the folding link is pivotally engaged to the upper leg at a first pivot point intermediate the ends of the first arm and the leg, respectively, for pivoting the arm in a generally vertical plane. The second arm is pivotally engaged at its lower end to the lower leg at a second pivot point. The distance between said first and second pivot points extends as the footrest support structure is elevated, thus causing the leg to elongate.