Treadmill with a shock-absorbing and cushioning structure

Abstract

A treadmill with a shock-absorbing and cushioning structure includes a base frame, and a belt frame, and a cushioning device. The base frame is separated from the belt frame. Thus, the base frame is disposed at a stationary state, thereby enhancing the stability and stiffness of the treadmill. In addition, movement of the belt frame is efficiently cushioned by the cushioning device, thereby enhancing the stability of the treadmill, and thereby reducing the noise in use.

What is claimed is:  
     
         1 . A treadmill with a shock-absorbing and cushioning structure, comprising a base frame, and a belt frame, and a cushioning device, wherein: 
 said base frame has a front end provided with a connecting portion, and a rear end provided with a pivot portion;    said belt frame has a front end provided with a connecting portion mating with the connecting portion of the base frame, and a rear end provided with a pivot portion pivotally mounted on said pivot portion of said base frame, so that said belt frame is pivotable relative to said base frame.; and    a cushioning device is mounted between said connecting portion of said base frame and said connecting portion of said belt frame.    
     
     
         2 . The treadmill with a shock-absorbing and cushioning structure in accordance with  claim 1 , wherein said cushioning device has a bottom portion pivotally mounted on said connecting portion of said base frame and a top portion pivotally mounted on said connecting portion of said belt frame.  
     
     
         3 . The treadmill with a shock-absorbing and cushioning structure in accordance with  claim 1 , wherein said cushioning device includes a lower pivot ear secured on said connecting portion of said base frame, a piston cylinder pivotally mounted on said lower pivot ear, an upper pivot ear secured on said connecting portion of said belt frame, a piston rod pivotally mounted on said upper pivot ear and slidably mounted in said piston cylinder, and an elastic member mounted between said piston rod and said piston cylinder and having a first end rested on said piston rod and a second end rested on said piston cylinder.  
     
     
         4 . The treadmill with a shock-absorbing and cushioning structure in accordance with  claim 3 , wherein said elastic member is a compression spring.  
     
     
         5 . The treadmill with a shock-absorbing and cushioning structure in accordance with  claim 1 , wherein said connecting portion of said base frame extends under the bottom of said base frame.  
     
     
         6 . The treadmill with a shock-absorbing and cushioning structure in accordance with  claim 1 , wherein a driven wheel is secured on the shaft of the roller of said belt frame. The base frame is provided with a motor and a drive wheel. A driving belt is mounted between said driven wheel and said drive wheel. An idler device is mounted on said driving belt.