| 摘要 |
<p>The toothbrush has a mobile interchangeable head that is moved by gears in a U-shaped sleeve (12) in its upper part. These are operated by a wheel (4) and the gears are covered by bellows. The head is held on a support (2) that has notches, a dome and conical studs that fit into corresponding parts on the head. The wheel acts on an intermediate gear (13) that moves a toothed part (9) on the head support. The head can be moved through an angle of 90 degs. to left or right.</p> |
