| 摘要 |
<p>The power hammer has a spindle lock arrangement (60) comprising of resilient synchronizing balls (72) positioned to engage a set of teeth before the spindle lock teeth (66) engage the set of teeth on movement from first mode to second mode to bring the set of teeth into meshing alignment with the spindle lock teeth. The set of teeth is arranged for rotation with a spindle which is rotatably mounted within the hammer housing (2). The spindle lock arrangement comprises of the spindle lock teeth, and is mounted within the hammer housing. A hammering mechanism generates repeated impacts on the tool or bit mounted at the forward end of the spindle. When in first mode, the spindle is rotatably within the housing. When in second mode, the set of teeth engage the spindle lock teeth to lock the spindle against rotation within the housing.</p> |
