Treadbase lifting mechanism of a treadmill

Abstract

A treadbase lifting mechanism is disclosed to include a framework with a treadbase above on it, a plank balanced on a fulcrum at the framework having one end pivoted to the an end of the treadbase, a driving mechanism, a sprocket pivotally mounted in the framework, and a chain meshed with the sprocket and connected between the driving mechanism and the other end of the plank for driving by the driving mechanism to turn the plank and to further lift the treadbase to the desired tilted position.

1 . A treadbase lifting mechanism comprising: 
 a framework;    a treadbase above said framework;    a driving mechanism mounted in said framework, said driving mechanism having a movable end adapted to provide a reciprocating driving force;    a plank pivotally mounted on a fulcrum at said framework and balanced on said fulcrum, said plank having a rear end pivoted to an end of said treadbase;    a rotary member pivotally mounted in said framework in front of the movable end of said driving mechanism; and    a flexible connecting member extending over said rotary member and connected between the front end of said plank and the movable end of said driving mechanism for driving by said movable end of said driving mechanism to turn said plank up and down on said fulcrum.    
   
   
       2 . The treadbase lifting mechanism as claimed in  claim 1 , wherein said rotary member is a gear wheel.  
   
   
       3 . The treadbase lifting mechanism as claimed in  claim 2 , wherein said flexible connecting member is a chain.  
   
   
       4 . The treadbase lifting mechanism as claimed in  claim 1 , wherein said rotary member is a roll.  
   
   
       5 . The treadbase lifting mechanism as claimed in  claim 4 , wherein said flexible connecting member is a cable.