Patent ID: 6666785
Filing Date: 2003-12-23
Classification: F16H

Abstract:
A tensioner comprising:a body having a hollow cylindrical part formed therein having one end for receiving a plunger and another end having threads of one direction for receiving a screw plug; a plunger slidably engaged in said one end of the hollow cylindrical part for sliding movement relative to the body; a ratchet mounted on said body an engaging one side of said plunger to provide unidirectional movement of said plunger outwardly of said hollow cylindrical part; a plug having threads of the same direction as said cylindrical part threads, said plug being screwed into said other end of the hollow cylindrical part of the body; and a coil spring disposed between the plunger and the plug for biasing the plunger in a direction away from the plug to apply tension, said coil spring having a winding direction which is different from said thread direction and having a coil end edge at the end engaging the plug so as to face opposite the direction of rotation of the plug when screwed into said body, so as to allow rotation of said plug relative to said spring by avoiding catching the end edge of the spring on the plug during screwing in of the plug, and avoid producing powder by friction, or buckling or fracture of the coil due to catching of the spring during compression of the spring in assembly.