| 摘要 |
With transfer bridges for ramps having an extension capable of being extended and retracted, and tongues capable of being pushed in, in connection with a bridge plate pivotably mounted on the ramp, a drive is associated with the extension. The drive retracts the extension by a small distance, for instance 20 mm, when the tongues are pushed in and arrested, in order to thus form a gap between the tongues and the vehicle which is to be loaded or unloaded, for avoidance of damage to the vehicle. The retraction of the extension is to occur with the release of the operating button intended for the extension of the extension, or for the lowering of the bridge plate dependent upon a time switch, so that the retraction movement of the extension can occur with a structurally simple double-acting cylinder.
|
