Patent ID: 6436006
Filing Date: 2002-08-20
Classification: A63B

Abstract:
A high precision resistance device for an exercise machine comprising;(a) a movable axis driving member; (b) an immovable axis driving member; (c) a driven member permanently engaged with said immovable axis driving member; (d) a means to engage said movable axis driving member with said driven member; (e) a first cable, a second cable, and a plurality of levers; (f) a first drum to store said first cable; said first drum is coaxial with and connected to said movable axis driving member; (g) a second drum; said second drum having a surface to be engaged with said second cable; (h) a shaft to permanently receive said immovable axis driving member and interchangeably receive either said second drum or at least one of said plurality of levers; (i) a resistance means to apply force against said driven member rotation; said resistance means further comprising a hydraulic cylinder filled with incompressible fluid and having front and rear ends, a first channel with first valve and first adjustment means of flow section area for said fluid, a second channel with second valve and second adjustment means of flow section area for said fluid, a piston, and a connecting rod to transmit force in either direction between said piston and said driven member; (j) a correction means to offset said resistance means force instability due to a variable position of said connecting rod and also to offset variable load needs to apply to said plurality of levers due to their variable position during an exercise; said correction means further comprising a cam coaxial with and connected to said driven member, and permanently engaged with second adjustment means of said second valve in said second channel.