| 摘要 |
An operator's platform which moves up and down with a carriage on a stacker mast has an overhead guard which is hinged for lowering so that the operator's platform and carriage may be moved close to the roof of a warehouse. The operator moves the guard over to a position where it rests upon the mast. Upward movement of the carriage lowers the guard, and downward movement of the carriage raises the guard to an intermediate position. The operator returns the guard to the protective position. Switches prevent upward movement of the carriage beyond a predetermined mast position when the guard is up and prevent downward movement of the carriage below a predetermined mast position when the guard is inoperative.
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