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• Auxiliary Hoist |
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| A supplemental hoisting unit, usually of lower load rating and higher speed than the main hoist. |
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• Axis of Rotation |
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| The vertical axis around which the crane's superstructure rotates. |
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• Boom |
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| In cranes and derricks usage, an inclined spar, strut, or other long member supporting the hoisting tackle. Also defined as a structural member attached to the revolving superstructure used for guiding and acting as a support for the load. |
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• Boom Angle Indicator |
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| An accessory device that measures the angle of the boom base section centerline to horizontal. |
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• Boom Stops |
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| A devise used to limit the angle of the boom at its highest position. |
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• Brake |
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| A device used for retarding or stopping motion by friction or power means. |
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• Block |
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| Sheaves or grooved pulleys in a frame provided with hook, eye, and strap. |
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• Crane |
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| A machine consisting of a rotating superstructure for lifting and lowering a load and moving it horizontally on either rubber tires or crawler treads. |
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• Counterweight |
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| Weights used for balancing loads and the weight of the crane in providing stability for lifting. |
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• Deck |
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| The revolving superstructure or turntable bed. |
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• Drum |
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| The spool or cylindrical member around which cables are wound for raising and lowering loads. |
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• Gantry |
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| A structural frame work (also known as an A Frame) mounted on the revolving superstructure of the crane to which the boom supporting cables are reeved. |
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• Headache Ball |
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| A heavy weight attached above the hook on a single line or whip line to provide sufficient weight to lower the hook when unloaded. |
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• Holding Brake |
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| A brake that automatically sets to prevent motion when power is off. |
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• Jib |
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| An extension attached to the. boom point to provide added boom length for lifting specified loads. |
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• Load |
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| The weight of the object being lifted or lowered, including load block, ropes, slings, shackles, and any other ancillary attachment. |
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• Load Block |
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| The assembly of the hook or shackles, swivel, sheaves, pins, and frame suspended from the boom point. |
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• Main Hoist |
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| Hoist system or boom used. for raising and lowering loads up to maximum rated capacity. |
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• Mechanical Load Brake |
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| An automatic type of friction brake used for controlling loads in the lowering direction. This device requires torque from the motor to lower a load but does not impose additional loads on the motor when lifting a load. |
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• Outriggers |
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| Support members attached to the crane's carrier frame which are used to the crane and may be blocked up to increase stability. |
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• Pawl |
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| Also known as "dog". It is a gear locking device for positively holding the gears against movement. |
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• Pendants |
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| Stationary cables used to support the boom. |
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• Radius |
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| The horizontal distance from the axis of rotation of the crane's superstructure to the center of the suspended load. |
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• Reeving |
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| The path that a rope takes in adapting itself to all sheaves and drums of a piece of equipment. |
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• Running Sheave |
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| Sheaves that rotate as the hook is raised or lowered |
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• Superstructure |
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| The rotating frame, gantry and boom or other operating equipment. |
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• Test Load |
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| Any load or force, expressed in pounds, used for testing or certifying the limitations within acceptable tolerances of the anticipated load. |
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• Two-Block |
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| The condition in which the lower load lock or hook assembly comes in contact with the upper load block or boom point sheave assembly. |
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• Quadrant of Operation |
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| The area of operation that the lift is being made in. Usually divided into four quadrants, i.e. front, rear and side(s) - left side and right side. |
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