The rail supported by the bridge girders on which the trolley travels.

A method of controlling crane motor speed when in an overhauling condition, without the use of friction braking.

A load used in durability calculations accounting for both maximum and minimum loads.

Environmental conditions that are unfavorable, harmful or detrimental to or for the operation of a hoist, such as excessively high (over 100 F.) or low (below 0 F.) ambient temperatures, corrosive fumes, dust laden or moisture laden atmospheres, and hazardous locations.

A method of control by which the motor supply voltage can be adjusted.

A crane which when activated operates through a preset cycle or cycles.

A supplemental hoisting unit, usually designed to handle lighter loads at a higher speed than the main hoist.

A girder arranged parallel to the main girder for supporting the platform, motor base, operator’s cab, control panels, etc., to reduce the torsional forces such load would otherwise impose on the main girder.

Brinell hardness number, measurement of material hardness.

The rectangular cross section of girders, trucks or other members enclosed on four sides.