Dolmar Gmbh

Marc Walkenhorst

Andreas Singer

A tensioning device for a chain or a belt drive for a motor of a hand machine tool, especially for a chain saw or a grinding or abrasive cutting-off machine, with a longitudinally movable bracket, such as a bracing or an arm, which can be fixed together with a cover with at least one bolt with a screwable nut to a casing or to another part of the hand machine tool, whereby the tensioning device has an adjusting screw extending in the longitudinal direction of the bracket on which a rider screw is movable to-and-fro by rotating the adjusting screw, the rider screw having a trunnion extending through an opening of the bracket so that, for tensioning the chain or the belt drive, the bracket follows a movement of the rider screw. Here a length of the trunnion is configured such that, the cover being set upon the hand machine tool, and the bracket being placed between the cover and the hand machine tool, the bolt projects sufficiently far through the cover for screwing on the nut only if the trunnion penetrates into the opening of the bracing.

Growing community of inventors

Hamburg, Germany

Marc Walkenhorst