Abstract: An exercise and/or rehabilitation apparatus is provided with a stationary frame and a pair of pedals pivotally mounted to the frame. The pedals can be pivoted in an up and down manner which allows an operator to assimilate a walking or jogging motion.

Abstract: A multipurpose transmission mechanism for bicycles, including a pair of one-way cranks, a control mechanism, a reciprocating mechanism, and a fixed lock wheel and a chain wheel holder.

Abstract: A wheelchair having a propulsion and speed change mechanism, the mechanism has a clutch with a cam clutch (21) and a cylindrical fly wheel (23) installed on a hub (24) of the shaft (25) of the main wheel of the chair. The clutch includes roller bearings (14), plate springs (22) and forward and backward regulating device (15). A matched union gear (20) is formed at the center of the cam clutch (21) and matched with a union gear (19) formed on a propulsion and speed change bar (12) so that the cam clutch (21) and the propulsion and speed change bar move as one body. The cam clutch (21) and the bar (12) are installed with a bearing (17) on the axle of the frame (13) of the wheelchair. A connecting rod (2) has one end connected to one of a plurality of holes (10) on the propulsion and speed change bar (12) with a fixing pin. The other end of the rod is connected to the hole (7) of the propulsion and speed change bar with a moveable pin (6).

Abstract: A bicycle having pivoted lever pedal system (1, 2, 45) and lever arm length or gear ratio (speed) change devices (3, 4, 5, 6). Propulsion forces from the lever pedals (1) are transferred via the lever arm length change device (3) through a flexible interconnecting cable and pulley system (7, 8, 9, 10, 11, 12, 13) to a rear drive hub assembly 14 having a pair of one-way clutches which allow the transfer of forward driving forces and enable the bicycle to be rolled back.