| 摘要 |
The slider by means of which the drill is changed from rotary drilling to percussion drilling is made of plastic. It is formed as a single unit with end portions to be pushed to select a first position for the rotary drilling and a second position for percussion drilling, stop portions which abut against parts of the housing to stop the movement of the slider in one or the other direction, and elongated latching elements which have cam-like projections for engaging latching recesses in the housing thereby locking the slider in the first or second position. Deformation of a ball riding in an opening of the slider and acting as thrust bearing for the spindle during rotary drilling is prevented by a bearing plate inserted in a recess in the slider in the region of the opening receiving the ball, or a stationary steel plate mounted in a part of the housing along the path travelled by the slider. |
