Pneumatic box spanner, has hammer that claps in cam, so that hammer is impelled from cam to turn receptacle, where hammer includes bracing fin which extends to two antipodal sides of hammer, so that sides form connection through fin

摘要

The spanner has a stop mechanism including a cylinder shaped retaining receptacle (51) having closed and open end surfaces to which a cam (53) and a cover are affixed. A hammer (55) fixed at the receptacle claps in the cam, so that the hammer is impelled from the cam to turn the receptacle. The hammer includes a bracing fin (58) which extends to two antipodal sides of the hammer, so that the sides form a connection through the fin.