| 摘要 |
The device has a base frame, two telescopically guided boom arms, end cross supports (8) with locking devices and further cross supports (11) with extra locking devices. The two cross supports (11) are arranged displaceable parallel to each other and in a longitudinal direction of the base frame (2) and each one support is coupled to each one end cross support (8). A rail guide with guide sections (16) and rails (17) is provided for the cross supports (11). The cross support can be supported on a stop (18) by a spring (24) such as compression spring. |
