| 摘要 |
An impact wrench includes a hammer, an anvil and a rotor driven by a motor, the hammer being swingeable in either direction with respect to the rotary axis of the rotor, the hammer resting on the anvil in a spring-loaded state so as to enable the hammer to line up with the axis of the anvil, the hammer including means for engaging itself with the inside surface of the rotor, whereby the hammer produces impacts at fixed intervals and transmits the same to the anvil.
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