| 摘要 |
In a rotary impact motor, a tool driving anvil has a circumferential groove forming an axial cam rise. The rotary hammer carries an impact dog for conjoint rotation. The impact dog is movable axially in the hammer between impact and release positions relative to the anvil. The impact dog is power biased towards the release position and has a follower lug which engages the anvil groove. During relative rotation between the hammer and the anvil the follower lug is forced by the cam rise to move axially against the power bias to deliver a rotational impact against an impact surface in the anvil groove. |
