| 摘要 |
A hoisting apparatus ( 10 ) for use at a manhole ( 1 ), comprising a supporting mast and a jib crane ( 14 ) connected at an angle to an upper end portion ( 16 ) of the supporting mast ( 12 ). The jib crane ( 14 ) has a front member ( 18 ) pointing upwardly and extending on one side of the supporting mast ( 12 ) and a rear member ( 20 ) having a rear end section ( 22 ) extending on another side of the supporting mast ( 12 ). A linking rod ( 24 ) is connecting the rear member of the jib crane ( 14 ) to the supporting mast ( 12 ). The apparatus further comprises a winch mechanism ( 30 ) mounted onto the jib crane ( 14 ) and having a cable ( 32 ) cooperating with the front member ( 18 ) of the jib crane ( 14 ) for hoisting an object from the manhole ( 1 ). In a preferred embodiment, the apparatus comprise a security fence ( 40 ) for surrounding at least partially the manhole ( 1 ) and preventing accidental entry therein, the supporting mast ( 12 ) being part of the fence. |
