The Difference of Crane, Overhead crane and Trolley

What is an overhead crane?
A crane is a complex machine that lifts, lowers and moves heavy or bulky loads. Cranes are equipped with components that provide the crane’s multi-directional mobility. A combination of the hoist, trolley and bridge motions provide full coverage of your factory floor.
What is a Hoist?
A hoist is a machine that performs a single task very well: lifting and lowering a load on a vertical plane. Hoists are situated on the primary horizontal beam of the crane, called the bridge girder. The hoist, when connected to the trolley, moves back and forth across the bridge girder. Chain hoists are excellent at lifting loads below 5 tons with little maintenance required, while Wire Rope Hoists are the optimal choice for 5 tons and above. Single-reeved hoists use a single piece of rope on the rope drum, while double-reeved hoists provide true vertical lift through the use of two ropes on a single drum. With wider diameter rope drums, minimum hook drift, or lateral movement of the hook, on a single-rived hoist can be achieved.
What is a Trolley?
The trolley is the mechanism that moves the hoist along the bridge girder of a crane. The hoist is moved horizontally along the top or underside of the bridge girder to position it above a load. There are three types of trolleys: low headroom, normal headroom and double girder trolley.

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