| 摘要 |
PROBLEM TO BE SOLVED: To provide a driver for executing excellent driving-in operation, sufficiently reducing reaction and vibration transmitted to an operator, and also having high durability.SOLUTION: For keeping driving-in performance high in a driver 100, driving-in energy U is desirably enlarged, and the U can be enlarged by sufficiently enlarging plunger side collision energy Tmore than plunger side collision energy T. With such a constitution, a load to a second bumper 22 for absorbing counter weight side collision energy T, becomes larger than a load to a first bumper 18 for absorbing the plunger side collision energy T. The counter weight side collision energy Timparted to the second bumper 22 side is desirably absorbed by being dispersed even to a collision energy absorption part formed as a member except for the second bumper 22.SELECTED DRAWING: Figure 1 |
