Oval track exerciser

Abstract

The present invention relates to an oval track exerciser. Two cranks are pivotably connected a cross rod between two upright supports on a base. A rail is pivotably connected to the bottom end of the respective cranks while a tread connecting rod is pivotably connected to the top end of the respective cranks. Besides, Each of the tread connecting rods is pivotably connected to a movable tread. Meanwhile, the movable treads are slidably mounted on the rail. A locating frame is disposed at the front end of the base, and a resistance device is mounted on the locating frame. Thus, a proper exercise resistance is created by means that two pull ropes are connected to the respective cranks. In addition, a driving device is installed under the base, and a transmission spindle thereof drives a moving connecting rod for a forward and backward movement so that the height of both rails can be raised or lowered to change the exercising slope.

What is claimed is:  
     
         1 . An oval track exerciser comprising: 
 two cranks pivotably connected a cross rod between two upright supports on a base;    a rail pivotably connected to the bottom end of said respective cranks while a tread connecting rod is pivotably connected to the top end of said respective cranks;    a movable tread pivotably connected with each of said tread connecting rods while said movable treads are slidably mounted on said rail for sliding motion; and    an end support pivotably connected to the top end at either side of said base so that it can be pivotably connected with the end of said rail.    
     
     
         2 . An oval track exerciser comprising: 
 two cranks pivotably connected a cross rod between two upright supports on a base;    a rail pivotably connected to the bottom end of said respective cranks while a tread connecting rod is pivotably connected to the top end of said respective cranks;    a movable tread pivotably connected with each of said tread connecting rods while said movable treads are slidably mounted on said rail for sliding motion;    a locating frame disposed at the front end of said base while a resistance device is mounted on said locating frame so that a proper exercise resistance is created by means that two pull ropes are connected to said respective cranks;    an end support pivotably connected to the top end at either side of said base so that it can be pivotably connected with the end of said rail; and    a driving device installed under said base and having a transmission spindle which drives a moving connecting rod for a forward and backward movement while the other end of said moving connecting rod is pivotably connected to said rail so that the height of both rails can be raised or lowered to change the exercising slope.    
     
     
         3 . An oval track exerciser comprising: 
 two cranks pivotably connected a cross rod between two upright supports on a base;    a rail pivotably connected to the bottom end of said respective cranks while a tread connecting rod is pivotably connected to the top end of said respective cranks;    a movable tread pivotably connected with each of said tread connecting rods while said movable treads are slidably mounted on said rail for sliding motion;    a lifting device fitted to the bottom of said rails in order to create a proper exercise resistance;    an end support pivotably connected to the top end at either side of said base so that it can be pivotably connected with the end of said rail; and    a driving device installed under said base and having a transmission spindle which drives a moving connecting rod for a forward and backward movement while the other end of said moving connecting rod is pivotably connected to said rail so that the height of both rails can be raised or lowered to change the exercising slope.