| 摘要 |
At least one rocker lever (3) is pivot mounted near two opposite facing edges of the trough and on the outside of the trough. The lever is displaced between a release and clamping position within the peripheral outline of the support trough (1) by a gear (6) positioned on the outside of the trough. The gear is connected to an adjusting unit (7) whose control screw (8) is accessible from the inside of the trough. Each rocker lever is two-armed and consists of an angled tension lever part (9), and an articulated lever part (10) joined to the gear. |
