Auxiliary Hoist

Supplemental hoisting unit, which usually provides a lighter capacity and higher speed than the main hoist provides


Part of a crane that carries the trolley or trolleys. The overhead bridge consists of girders, trucks, end ties, foot walks, and a drive mechanism

Bridge Travel

Crane movement in a direction parallel to the crane runway


Distance from any part of the crane to a point of the nearest obstruction

Conductors, Bridge

Electrical conductors located along the bridge structure of a crane to provide power to the trolley

Conductors, Runway

Electrical conductors located along the crane runway to provide power to the crane


Machine for lifting and lowering a load and moving it horizontally, with the hoisting mechanism an integral part of the machine. Whether fixed or mobile, cranes are driven either manually or by power


Cylindrical member around which the joist's wire ropes are wound for raising or lowering the load

Gantry Crane

Crane similar to an overhead crane except that the bridge for carrying the trolley or trolleys is rigidly supported on two or more legs running on fixed rails or other runway


As part of a crane, the hoist is an apparatus that exert a force for lifting or lowering large, heavy items

Hoist Chain

Load bearing chain in a hoist

Hoist Motion

Motion of a crane that raises and lowers a load


Total superimposed weight on the load block or hook

Load Block

Assembly of hook or shackle, swivel, bearing, sheaves, pins, and frame suspended by the hoisting rope

Main Hoist

Hoist mechanism provided for lifting the maximum rated load

Overhead Crane

Crane with a movable bridge carrying a movable or fixed hoisting mechanism and traveling on an overhead fixed runway structure

Rated Load

Maximum load for which a crane or individual hoist is designed and built by the manufacturer. Maximum rate load are required on the equipment's nameplate


Generally refers to the use of wire rope, unless otherwise specified

Running Sheave

A Sheave that rotates as the load block is raised or lowered


Assembly of rails, beams, girders, brackets, and framework on which the crane or trolley travels


Horizontal distance center-to-center of runway rails


Device to limit travel of a trolley or crane bridge. This device normally is attached to a fixed structure and normally does not have energy absorbing ability


Unit that travels on the bridge rails and carries the hoisting mechanism

Trolley Travel

Trolley movement at right angles to the crane runway


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