Glossary


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1) Trolley hoist

A hoist suspended from a trolley.  A hoist can be connected to a trolley by hook or clevis, or a hoist can be integral with the trolley.

2) Double girder crane

An overhead traveling bridge crane that utilizes two bridge beams set atop the runway (end) trucks.  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 hook from the hoist "falls" between the two bridge beams.  Headroom under the crane is increased by utilizing this hoist/crane configuration.