| 摘要 |
PURPOSE: An impact wrench in which a bidirectional oil pressure pulse is added is provided to suppress noise and vibration, increase rotating force and present fastening force of high accurate by adding oil pressure to the air pressure of an air motor. CONSTITUTION: A push button(3) and a lever selectively operating forward/backward rotation are mounted to control air pressure on an air vent port(2) which is formed on one side of a main body(1). A noise-proof tool(6) is mounted on an exhaust part(5) of the air vent port(2), and a motor(7) operated by air pressure of the air vent port(2) is mounted on one side of the port(2). A pair of air supply holes(8) and exhaust holes(9) are formed on the motor(7), in which rotation is transferred to a pulse part(10) having a bidirectional pulse diaphragm(14) An envelope(11) operated by the rotation is mounted in the pulse part(10), and a rotating bane(12) a liner(13) are mounted outside the envelope(11), and the wrench is mounted to one end of the envelope.
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