Treading exercising machine with adjustable elliptical track for tilting at two sides

Abstract

A treading exercising machine generates adjustable elliptical tracks to tilt at two sides thereof. The treading exercise machine has a base each side of which having a respective support frame. The support frames are pivotally installed with symmetrical sliding grooves. Two sides of another end of the base have respective coaxial cranks. Each crank is pivotally connected to one end of a pedal. Another ends of the two pedals are connected to sliding wheels. The sliding wheels are received in the sliding grooves so as to move therein. The two sliding grooves with a predetermined length have respective axial rods at the outer middle sides thereof. Thereby, the sliding grooves are adjustable along the support frames to adjust tilting angles at the two sides; and thus, elliptical tracks of the pedals are changed to present operations of moving upwards, downwards and flatly.

What is claimed is:  
     
         1 . A treading exercising machine with adjustable elliptical track to tilt at two sides thereof; the treading exercise machine having a base; one end of the base having two sides; each side having a respective support frame; characterized in that: 
 the support frames are pivotally installed with symmetrical sliding grooves; two sides of another end of the base have respective coaxial cranks; each crank is pivotally connected to one end of a pedal; another ends of the two pedals are connected to sliding wheels; the sliding wheels are received in the sliding groove so as to move therein; the two sliding grooves with a predetermined length have respective axial rods at the outer middle sides thereof so that the sliding grooves are pivotally installed to the support frames; thereby, the sliding grooves are adjustable along the support frames to adjust tilting angles at the two sides; thus, elliptical tracks of the pedals are changed to present operations of moving upwards, downwards and flatly.    
     
     
         2 . The treading exercising machine with adjustable elliptical track to tilt at two sides as claimed in  claim 1 , wherein an angle adjuster is installed between bottoms of the sliding grooves and the base so that oblique angle of each sliding groove is changeable and is positioned after being adjusted.  
     
     
         3 . The treading exercising machine with adjustable elliptical track to tilt at two sides as claimed in  claim 2 , wherein the angle adjuster includes an H type frame pivotally installed to bottoms of the two symmetrical sliding grooves; a bottom of the H type frame is pivotal with a push rod; two sides of the push rod have respective guide holes for being firmly secured to the two guide rods of the base; a screw hole is formed at a middle rod of the H type frame; two opposite inner sides of the support frames are formed with symmetrical guide rods; a lifting motor is installed at a predetermined position of the base; the screw rod of the lifting motor is screwed into the screw hole of the push rod; 
 wherein by above mentioned components, when the lifting motor is actuated, the screw rod will drive the push rod to move forwards and backwards so as to drive the H type frame pivotally installed to the push rod to move synchronously; thereby, the oblique angle of the sliding grooves at an upper end of the H type frame is changed leftwards or rightwards; thus, when the left and right pedals of the two sliding grooves are operated, a different elliptical track is generated.