| 摘要 |
A power tool includes a power source, a speed change mechanism and a tip tool wherein the speed change mechanism has first and second rotating shafts arranged in parallel, a first power transmission passage equipped with a first gear train and a first clutch, and a second power transmission passage equipped with a second gear train and a second clutch. The speed change mechanism is constituted to switch the transmission passage between the first power transmission passage and the second power transmission passage while keeping the first and second gear trains in meshed state by switching the first and second clutches between power transmission state and power interruption state depending on a load applied to the tip tool.
|
