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Crane and Hoist Equipment and Components by Type > Resource Center > Crane Glossary > O 
 

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OPEN DECK HOISTING MACHINERY

Hoisting machinery that employs a base mounted motor and gearcase, each coupled to the winding drum by means of forged steel, readily accessible, bolted couplings. Generally used in applications requiring high capacity lifts and/or high duty cycles.

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OPERATOR STATION

Enclosure with spring return push buttons to allow an individual to control each motorized function of a crane. Can be hardwired pendant or a remote radio transmitter.

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OPERATOR'S CAB

The operator’s compartment from which movements of the crane are controlled. To be specified by the manufacturer as open, having only sides or a railing around the operator, or enclosed, complete with roof, windows, etc.

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OSHA

Occupational Safety and Health Standards for General Industry.

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OVERHEAD CRANE

A type of crane where the hook-and-line mechanism runs along a horizontal beam. It typically consists of a hoist to lift the items, the movable bridge, which spans the area covered by the crane and a trolley to move along the bridge on an overhead fixed runway structure. Overhead Cranes are similar to gantry cranes. .

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OVERLOAD LIMIT DRIVE

This device is an emergency device intended to permit the hoist to lift a freely suspended load within its rated capacity, but prevents lifting of an overload that would cause permanent damage to a properly maintained hoist, trolley or crane.

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OVERLOAD PROTECTION (OVERCURRENT)

A device operative on excessive current to cause and maintain the interruption or reduction of current flow to the equipment governed.