| 摘要 |
A center portion of a handle housing portion 3 is arranged with a pressure reducing valve mechanism portion 50 for reducing a pressure of high pressure compressed air to be surrounded by an exhaust chamber 40, in a state of making a trigger 37 ON, air pressure P 22 of a secondary pressure side port 52 of the pressure reducing valve mechanism portion 50 is made to be higher than air pressure P 21 of a secondary pressure side port 52 of the pressure reducing valve mechanism portion 50 in a state of making the trigger 37 OFF by communicating a hermetically closed chamber 59 a of a pressure control spring 56 and the exhaust chamber 40 by way of a relief hole 59 b such that an exhaust air pressure of an air motor mechanism portion 10 is added to a spring force F of the pressure control spring 56 of the pressure reducing valve mechanism portion 50.
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