Shaking endless belt for treadmills

Abstract

A treadmill includes a frame having two rollers and an endless belt is mounted on the two rollers. One of the rollers is driven by a motor and a control device is electrically connected to the motor so as to control the motor to be rotated in different directions alternatively. The alternative rotation of the motor shakes the endless belt and the user's body.

1 . A treadmill comprising: 
 a frame having two rollers located at two ends of the frame and an endless belt mounted on the two rollers, one of the rollers being driven by a motor and a transmission belt connected between the roller and the motor, and    a control device electrically connected to the motor and controlling the motor to rotate in different directions.    
   
   
       2 . The treadmill as claimed in  claim 1 , wherein a pair of idle wheels are located between the motor and the roller driven by the transmission belt, the idle wheels are in contact with the transmission belt.  
   
   
       3 . The treadmill as claimed in  claim 1 , wherein the motor rotates in opposite directions alternatively.