US Patent 7713176 Recumbent stepper exercise machine

A recumbent step exercise machine including a frame, a seat supported from the frame, and a drive mechanism supported from the frame. The drive mechanism includes a first and a second pedal, at least one axle shaft, at least one clutch, a speed increaser, and a brake. The first and the second pedal assemblies are each linked to at least one shaft by a linkage assembly. Each of the shafts are drivingly engaged to at least one clutch. The linkage assemblies act as levers that translate the reciprocating motion of the pedal assemblies into rotational motion of the shaft. Each linkage assembly extends downwardly from the shaft to which it is drivingly engaged and terminates with the pedal assembly. A first and a second arm mechanism may be linked through the linkage assembly to the first and second pedal assembly.