Lifting device for a treadmill

Abstract

The present invention relates to lifting device for a treadmill. A lifting motor with a locating transmission spindle is pivotably connected to the front end of the base frame. A socket is movable backward and forward by means of the rotational movement of the locating transmission spindle while the other end of the socket is pivotably connected to the top of an inverted-T-shaped cross bar which extends beyond both sides of the base frame and is connected with a pull rod, respectively. The other end of each of pull rod is pivotably connected to the upright support, thereby forming a pivot point. Accordingly, when the lifting motor is actuated to let the socket rotate by means of the rotational movement of the locating transmission spindle, the inverted-T-shaped cross bar and the pull rod will move in the desired direction. Therefore, the base frame will be moved upward and downward on the pivot point.

What is claimed is:  
     
         1 . A lifting device for a treadmill comprising: an upright support mounted at both sides of the front end of a base frame, a console being disposed at the top thereof while a horizontal leg is connected to the bottom thereof, and 
 a base frame having a first cross bar on which a walking belt transmission assembly is mounted while a front roller is driven in motion by means of a transmission belt, a walking belt being rotatable by means of said front roller and a rear roller, a support wheel being fitted to either bottom inner side at the rear end of said base frame;    wherein the improved lifting device for a treadmill is characterized by:    a lifting motor with a locating transmission spindle pivotably connected to the front end of said base frame, a socket being movable backward and forward by means of the rotational movement of said locating transmission spindle while the other end of said socket is pivotably connected to the top of an inverted-T-shaped cross bar which extends beyond both sides of said base frame and is connected with a pull rod, respectively, the other end of each of said pull rods being pivotably connected to said upright support, thereby forming a pivot point.    
     
     
         2 . The lifting device for a treadmill as recited in  claim 1 , wherein an inverted-L-shaped rod is pivotably connected the lower side of said first cross bar of said base frame while the other end of said inverted-L-shaped rod is pivotably connected to an axle of a support element, whereupon said support element is secured to a second cross bar of said horizontal leg of said upright support.