| 摘要 |
The U-shaped rails use a plate and a U-shaped rail (4') enclosing the plate. Lock devices (6a,6a') are provided which in a first adjustment position lock a combining effect between the plate and the rail. In a second adjustment position the effect between the plate and the rail is released. The locking device adopts a locking position in a U-frame (7). A force activation (P) can move the lock heel formations to a freeing position, the formations working on conjunction with an edge of the plate in a locking position. |
