| 摘要 |
The tool is so coupled to motor so that tool is actuated only if it comes into contact with workpiece. The tool may be a reciprocating hammer. The driving connection (27) has a first rotating element (38) and a second, reciprocating element (29). The driving and reciprocating element are coupled only when tool contacts workpiece is moved. The reciprocating part has helical cam track in contact with rotating lug (39). The tool is spring loaded for imparting working blow and it is raised by cam. |
