Foldind treadmill offering buffering effect during folding and unfolding thereof

Abstract

A folding treadmill offering buffering effect during folding and unfolding comprises a base that has a circular tread belt as well as a power cylinder. The power cylinder includes a pressurization chamber and an oil-air cylinder chamber, wherein the oil-air cylinder chamber is loaded with pressured air and oil of a predetermined amount. Due to velocity difference between air and oil, a phased-changeable deceleration resistance can be provided during folding and unfolding the treadmill. Further, the characteristics of the power cylinder is related to buffer and balance so as to achieve the buffering effect in both lifting and lowering of the base. Thereupon, a safe altitude of the base can be defined and a designed structure contributing to users' safety can be accomplished.

1 . A folding treadmill offering buffering effect during folding and unfolding thereof, comprising a base that has a circular tread belt as well as a power cylinder therein, wherein the power cylinder includes a pressurization chamber and an oil-air cylinder chamber loaded with pressured air and oil of a predetermined amount, whereby a phased-changeable deceleration resistance can be provided during folding and unfolding the treadmill due to velocity difference between air and oil and the buffering effect effective in both lifting and lowering of the base can be achieved. 
   
   
       2 . The folding treadmill of  claim 1 , wherein when pressures in the pressurization chamber and the oil-air cylinder chamber are balance, the power cylinder balances and stops operating. 
   
   
       3 . The folding treadmill of  claim 1 , wherein the power cylinder can be installed at a proper position on the treadmill in either of opposite directions. 
   
   
       4 . The folding treadmill of  claim 1 , wherein a handle, a positioning block and a wheel are provided at each end of a horizontal rod under the tread belt, 
   
   
       5 . The folding treadmill of  claim 1 , wherein a driving device for driving the tread belt is deposited at one side of the base 
   
   
       6 . The folding treadmill of  claim 1 , wherein the base is connected with a bottom brace by means of a supporting frame and a pivot shaft. 
   
   
       7 . The folding treadmill of  claim 6 , wherein each said power cylinder is deposited at a proper position on either side of the bottom brace. 
   
   
       8 . The folding treadmill of  claim 6 , wherein two cushion pads are deposited at proper positions near where the bottom brace joints the horizontal frame.