Load compensator for spring counter-weighting mechanism

Details Load compensator for spring counter-weighting mechanism Load compensator for spring counter-weighting mechanism

F - Mech Eng,Light,Heat,Weapons

16

F

F16F 15/28 (2006.01) A47B 9/02 (2006.01)

Patent

CA 2098515

An improved load compensator for a spring counter-weighting mechanism including a snail cam to provide a constant counter-weight force is described. The cam provides a constant torque to a drum on which are wound cables for exerting a constant counter-weighting force. A manually operable device for altering the relative radial positions of the cam and drum varies the amount of the constant counter-weighting force. The cam is rotated with respect to the drum by a spur gear fitting within a ring gear fixed to the drum and rotated by a knob connected to an axle carrying a pinion gear engaging the spur gear. The spiral surface can be effectively reconfigured with respect to a portion of the cable fitting therearound.

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