| 摘要 |
A dock leveler that includes a pivotable bridge plate and an extension that can be moved back and forth relative to the latter and serves for reseting the bridge plate on a platform that is to be loaded or unloaded. A switch is provided that effects or permits automatic return of the dock leveler into the neutral or rest position. To ensure that return to the neutral position reliably occurs only when no platform is in the vicinity of the dock leveler, there is provided below the tip of the extension a sensing element that is movable in the direction toward the bridge plate and that can be contacted by the platform. The sensing element activates the switch except when the platform contacts the sensing element, at which time the switch is deactivated.
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