Treading exercise machine with elliptical trace

Abstract

A treading exercise machine with an elliptical trace comprises a base, a first pivotal shaft, a second pivotal shaft, a supporting rod, and a pair of treading rods. When the insertion shaft of the button is adjusted to position in one of the positioning hole, the arm is positioned. The treading rods move reciprocally with the treading actions of the user. If the insertion shaft of the button is inserted into another positioning hole, the moving range of the treading rods will change so as to adjust the difficulty in exercise. When the shaft of the button is adjusted to move out of the positioning hole, the arm freely moves forwards and backwards. As the pulley slides to a buckle groove at a distal end of the guide groove, by the cranks to move along a round trace, the treading rods is drive to move along an elliptical trace.

What is claimed is:  
     
         1 . A treading exercise machine with an elliptical trace comprising a base, a first pivotal shaft, a second pivotal shaft, a supporting rod, and a pair of treading rods; wherein 
 a front end of the base has the supporting rod; a middle section of the supporting rod is installed with the first pivotal shaft which passes through a though hole in the supporting rod and arranged at two sides of the supporting rod; a top of the supporting rod is installed with a control panel and a handle; a rear end of the base has a second pivotal shaft; a pair of swingable arms are positioned at two sides of the supporting rod and pivotally suspended from the first pivotal shaft; a pair of cranks are pivotally installed from the second pivotal shaft; front ends of the pair of treading rods are pivotally connected to the lower ends of the arms, respectively;    each side of the first pivotal shaft is firmly secured with an angle adjusting plate which is at an inner side of the arm; a lower side of the angle adjusting plate is installed with a plurality of positioning holes; each arm is installed with a button at a position with respect to a selected positioning hole of the angle adjusting plate; the button has an insertion shaft which has a size smaller than the size of the positioning hole; thereby, adjusting the button causes the shaft to be inserted into one of the positioning hole;    thereby, when the insertion shaft of the button is adjusted to position in one of the positioning hole, the arm is positioned; the treading rods move reciprocally with the treading actions of the user; if the insertion shaft of the button is inserted into another positioning hole, the moving range of the treading rods will change so as to adjust the difficulty in exercise; when the shaft of the button is adjusted to move out of the positioning hole, the arm freely moves forwards and backwards; as the pulley slides to a buckle groove at a distal end of the guide groove, by the cranks to move along a round trace, the treading rods are drive to move along an elliptical trace.    
     
     
         2 . The treading exercise machine with an elliptical trace as claim in  claim 1 , wherein an upper end of each treading rod is installed with a position-adjustable pedal so as to set a connecting position of the pedal to the treading rod.  
     
     
         3 . The treading exercise machine with an elliptical trace as claim in  claim 1 , wherein a plurality of though holes are spaced arranged at one lateral side of the treading rod; a bottom of the pedal has a resisting plate which resists against the lateral sides of the treading rod; the clamping plate is installed with a positioning pin at position with respect to one side of the treading rod having the though holes; the positioning pin is inserted into one of the though hole; by moving the pedals, moving traces of the pedals are changed.  
     
     
         4 . The treading exercise machine with an elliptical trace as claim in  claim 1 , wherein a rear bottom of the treading rod is installed with a seal guide groove and an inner side of the distal end of the treading rod has a positioning plate; the positioning plate has a round hole at a predetermined position; a sliding wheel of the crank is mounted in the seal guide groove; the sliding wheel has a concave hole; the sliding wheel is guided to a distal end of the guide groove; then the concave hole of the sliding wheel is aligned to the round hole of the positioning plate; then a pin is inserted into the concave hole from the round hole so that the sliding wheel is positioned at a fixing position of the guide groove; when the pin is taken not, the sliding wheel is movable in the guide groove.