Stepping machine

Claim 1

A stepping machine comprising: a base frame having an upright stub tube and an upright shaft adjacent to said upright stub tube, said upright stub tube having two horizontal axles bilaterally disposed at the same elevation and two connecting plates respectively turned about said horizontal axles; an upright post longitudinally connected to said upright stub tube and turned on its longitudinal center axis, said upright post having a lug adjacent to said upright stub tube, the lug of said upright post defining an elongated sliding slot; a hollow upright pedal support revolvably sleeved onto the upright shaft of said base frame, said upright pedal support comprising a horizontal lug coupled to the elongated sliding slot of the lug of said upright post by fastening means, two horizontal axles bilaterally disposed at the same elevation near a top end thereof, and a transverse bar disposed near a bottom end thereof; two pedals, each pedal having a fixed end turned about one horizontal axle of said pedal support, and a free end, the fixed end of each pedal having a downward rod terminating in a barrel; two hydraulic cylinders, each hydraulic cylinder comprising a casing turned about one end of the transverse bar of said pedal support, and a piston rod having one end sliding in said casing and an opposite end pivoted to the free end of one pedals; two first links respectively pivoted to said connecting plates; and two second links respectively pivotably connected between said first links and the barrels of the downward rods of said pedals.