Patent ID: 7344121

Claim:
An end surface gear-type overload protection device for manually operated hoists, the constituents of which include a load pulley wheel installed by clamping between two side plates via bearing devices, and in the arrangement the outer lateral extent of one said side plate provides for the manually operated input of a drive component and, furthermore, said drive component impels an axially disposed transmission shaft, thereby enabling a chain mounted on said load pulley wheel and connected to a hoisting hook to lift an object; the innovative features of the invention herein include: said drive component has installed axially at its front end an umbrella type gear ring having predetermined inclined angle troughs and peaks, at its rear end reticulated axially is a recess, and seated in said recess is an elastic component; said transmission shaft has axially facing the umbrella type gear ring and, furthermore, rotatably installed a drive sleeve, said drive sleeve consisting of a relatively large diameter holding flange and a relatively narrow diameter hollow neck, said drive sleeve also having inclined angle troughs and peaks disposed that enmesh the umbrella type teeth section of said umbrella type gear ring; the hollow neck has axially disposed a shaft hole for inserting said drive component and, furthermore, died along its extremity are external threads on which an adjustment nut is tightened axially against said elastic component, the elastic component axial compression and decompression adjusted thereby regulating control over the enmeshment and disengagement of said umbrella type gear ring with said umbrella type teeth section; as such, the present invention achieves control and operation of manually operated hoist overload prevention.