ApplicationNo. 06/560425 filed on 12/12/1983
US Classes:173/201, Pulsation caused by mechanical movement173/117Hammer head driven by electric motor
ExaminersPrimary: Meister, James M.
Assistant: Knoble, John L.
Attorney, Agent or Firm
International ClassesB25D 17/24 (20060101)
B25D 17/00 (20060101)
B25D 17/06 (20060101)
Foreign Application Priority Data1983-02-12 DE
AbstractIn a drill hammer a motor driven striking mechanism is provided with two air cushions of changeable volumes, through which impact energy is transmitted from the motor to a reciprocating striker which in turn transmits the energy to a tool of the drill hammer. When the striker moves in the direction towards the tool both air cushions act on the striker whereas when the striker moves away from the tool only one of two air cushions acts on the striker.