| 摘要 |
A trolley for suspending a weight from an overhead track having a pair of spaced, parallel rails or comprising an I beam. The trolley comprises a pair of slide members slidable along the track; friction elements locatable below the track; and arms interconnecting the slide members and the friction elements to suspend a weight therefrom whereby on suspension of a weight from the interconnecting arms at least the friction elements are moved towards the track to lock the trolley in a preselected position along the track.
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