| 摘要 |
PROBLEM TO BE SOLVED: To easily provide desired cushion performance having a large bending margin. SOLUTION: A piston damper 10 is provided in the lower part of a cylinder 3 where a piston 6 connected to a driver 5 for driving-in a nail is moved up and down. The piston damper 10 is made of an elastic body integrally formed in a dual cylinder shape connecting the lower parts of inner and outer cylinders 7 and 8 with each other in a connecting part, and a large diameter part and a step part in the lower outer periphery of the outer cylinder 8 are held in a cylinder lower end part. A portion above the step part is reduced in diameter, a gap So is provided in the outer peripheral side position of the outer cylinder 8, and the middle part of a height direction is smoothly bent toward the outer peripheral side when the piston 6 clashes with the upper end of the piston damper 10.
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