Stepping exercise machine

Abstract

A stepping exercise machine includes a support unit, a transmission unit and a tread unit. The support unit includes a support beam and a plurality of support legs connected to the support beam. The transmission unit includes a lever. The lever is pivotally connected to a connecting member provided on the support beam. Two sides of the lever are an effort arm and a resisting arm with the connecting member as a fulcrum. The two sides of the lever are connected to two ends of the support beam through tension springs, respectively. The tread unit includes a pair of pedals. The pedals are connected to two ends of the lever. The transmission unit further includes a pair of swing rods. First ends of the swing rods are pivotally connected to the connecting member. Second ends of the swing rods are pivotally connected to lower ends of the pedals, respectively.

What is claimed is: 
     
         1 . A stepping exercise machine, comprising a support unit, a transmission unit and a tread unit, characterized by:
 the support unit including a support beam and a plurality of support legs connected to the support beam;   the transmission unit including a lever, the lever being pivotally connected to a connecting member provided on the support beam, two sides of the lever being an effort arm and a resisting arm with the connecting member as a fulcrum; the two sides of the lever being connected to two ends of the support beam through tension springs, respectively;   the tread unit including a pair of pedals, the pedals being connected to two ends of the lever;   the transmission unit further including a pair of swing rods, first ends of the swing rods being pivotally connected to the connecting member, second ends of the swing rods being pivotally connected to lower ends of the pedals, respectively.   
     
     
         2 . The stepping exercise machine as claimed in  claim 1 , wherein the tread unit further includes pedal fasteners, lower ends of the pedal fasteners are pivotally connected to the lever, and the pedals are fixed on the pedal fasteners, respectively. 
     
     
         3 . The stepping exercise machine as claimed in  claim 2 , wherein the second ends of the swing rods are pivotally connected to the pedal fasteners. 
     
     
         4 . The stepping exercise machine as claimed in  claim 1 , wherein the connecting member is provided with an arcuate protective casing. 
     
     
         5 . The stepping exercise machine as claimed in  claim 2 , wherein the connecting member is provided with an arcuate protective casing. 
     
     
         6 . The stepping exercise machine as claimed in  claim 1 , wherein the tension springs are symmetrically disposed, outer ends of the tension springs are connected to the ends of the support beams respectively, and/or inner ends of the tension springs are connected to middle portions of the effort arm and the resisting arm of the lever, respectively. 
     
     
         7 . The stepping exercise machine as claimed in  claim 2 , wherein the tension springs are symmetrically disposed, outer ends of the tension springs are connected to the ends of the support beams respectively, and/or inner ends of the tension springs are connected to middle portions of the effort arm and the resisting arm of the lever, respectively. 
     
     
         8 . The stepping exercise machine as claimed in  claim 3 , wherein the tension springs are symmetrically disposed, outer ends of the tension springs are connected to the ends of the support beams respectively, and/or inner ends of the tension springs are connected to middle portions of the effort arm and the resisting arm of the lever, respectively.