| 摘要 |
PROBLEM TO BE SOLVED: To set an outer diameter of a driver 14 to be large according to an inner diameter of an injection port 5, and to allow the driver 14 hit the whole surface of a nail head portion. SOLUTION: The trigger mechanism 9 equipped with a manually controllable trigger lever 8 operating a starting valve 30 has a contact arm 36 slidably disposed along a nose 25 whose upper end portion 36a is disposed near the starting valve 30 and cooperating the trigger lever 8 to actuate the starting valve 30. A tip end portion 36b of the contact arm 36 is formed in a plate shape in an injecting direction of the nail, and disposed so as to face the inside of the injection port 5. On an outer peripheral surface of the driver 14, a groove 40 storing the tip end portion 36a of the contact arm 36 is formed in a longitudinal direction of the driver 14. COPYRIGHT: (C)2004,JPO&NCIPI
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