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A trolley is a device that rests and rolls along the Beam your hoist will and the trolley will use it's gears to roll the trolley wheels along the Beam
Generally this type of crane utilizes a top running trolley hoist which moves along the top of the two bridge beams on its own set of trucks/trolley wheels. The
Bridge: That part of an overhead crane consisting of girders, end trucks, The principle horizontal beams of the crane bridge, which supports the trolley
