Patent ID: 6296586
Filing Date: 2001-10-02
Classification: B24B,B27B

Abstract:
A tensioning device for an endless drive member for a motor of a hand machine tool, said device comprising:a fixed part of a machine hand tool having at least one protruding bolt,a cover having at least one hole extending through the cover to receive the at least one protruding bolt of the fixed part,a longitudinally movable endless member tensioning bracket with at least one hole extending therethrough to receive the at least one protruding bolt of the fixed part and which can be fitted onto the at least one bolt together with the cover and fixed to the fixed part by a nut screwable onto the bolt,an adjusting screw extending in the longitudinal direction, anda rider screw carried by the adjusting screw and movable to and fro in the longitudinal direction by rotating the adjusting screw,the rider screw having a trunnion extendable though a mating opening of the bracket so that, for endless member tensioning purposes, the bracket follows the longitudinal movement of the rider screw,the trunnion having a length so selected that, in assembling the cover and bracket with the protruding bolt and with the fixed part of the machine, with the bracket being first placed on the bolt and the cover being next placed on the bolt, the bolt projects sufficiently far through the cover to permit screwing of the nut onto the bolt only if the trunnion penetrates into the mating opening of the bracket.