| 摘要 |
PROBLEM TO BE SOLVED: To reduce size and weight of a driving machine, and to effectively absorb excessive energy of a driver blade 4 by a piston bumper 7. SOLUTION: In this driver blade 4, a blade part 4b and a piston part 4a are integrally constituted by a high strength material without being connected with a screw. In an upper surface of the piston part 4a, an inside part is made thinner than that of an outer peripheral part. In a lower surface of the piston part 4a, a wall part having an outer peripheral part higher than the inside is formed. COPYRIGHT: (C)2008,JPO&INPIT
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