| 摘要 |
PURPOSE: A pneumatic impact wrench is provided to reduce scattering dust by exhausting compressed air to a lower side of a knob after rotating a vane. CONSTITUTION: A vent hole(7) under a vane(3) is closed by a tool joint part(6). A jointing hole(8) is formed inside of a knob(4). The jointing hole is communicated with the vent hole. A trigger inserting hole(11a) is formed to a front portion of a guide hole(11) to insert the trigger(13) fixed to the knob. An air path(11b) is formed to a rear portion of the guide hole. The air path is connected to an air pipe line(2a). The air pipe line is connected to the vane. A vent pipe line(11d) is formed to right and left sides of the guide hole. The vent pipe line is connected with the vent hole. An end portion of the vent pipe line is connected to a space portion(17). The space portion is formed between the guide hole and the knob. An air supply hole(11c) is formed to a lower end of the guide hole. The air supply hole is connected to the air path. Therein, an interrupted valve(15) screws a connecting bush(10) to hold a support spring(14). Therefore, a pounder(16) controls the interrupted valve. The pounder is operated by the trigger. Through holes(10a) are formed around an outer peripheral surface of the connecting bush. Thereby, scattering dust is reduced by exhausting compressed air rotating the vane to a rear portion.
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