| 摘要 |
<p>The mechanism has a movable linking unit (43) pushing a movable valve (50) to move for shifting a gas passage (58, 59) to be open when a hammer (24) rotates at high speed, corresponding to the high speed rotation of the hammer. The unit (43) causes the valve to close the gas passage without pushing the valve to move, when the hammer rotates at the low speed, corresponding to the low speed rotation of the hammer.</p> |
