| 摘要 |
A dockboard having a hinged lip which normally hangs down and retains the dockboard in a substantially horizontal position. Linkage connected to the dockboard and the lip locks the latter in its pendent position, and when the dockboard is swung upwardly a predetermined distance and then lowered, the linkage is moved across a toggle line and thereafter swings the lip into an extended position. When the dockboard is released, it swings downwardly until it hits stop means, at which time the momentum causes the lip to swing back towards the pendent position.
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