| 摘要 |
PROBLEM TO BE SOLVED: To enhance the shock-absorbing effect and the durability by achieving almost uniform deflection from an upper side to a lower side when a shock is received.SOLUTION: The bumper of a driving tool has a cylindrical overall shape and also has a space portion S expanding downward therein. A normal inclined-surface 23, in which an outer diameter becomes larger from an upper end of a total height of the bumper toward a slightly upper position of an intermediate portion b2, is formed at an upper portion b1 of an outer peripheral surface. A bulging-out portion 21 having the largest outer diameter is bulged out at the intermediate portion b2. A reverse inclined-surface 24, in which the outer diameter becomes smaller downwardly, is formed at a lower portion b3. |
