ANSI. The American National Standards Institute.

Appointed. Assigned specific responsibilities by the employer or the employer's representative.

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

Auxiliary hoist. A supplemental hoisting unit of lighter capacity and usually higher speed than provided for the main hoist.

Brake. A device used for retarding or stopping motion by friction or power means.

Bridge. That part of a crane consisting of girders, trucks, end ties, footwalks, and drive mechanism which carries the trolley or trollies.

Bridge travel. The crane movement in a direction parallel to the crane runway.

Bumper (buffer). An energy absorbing device for reducing impact when a moving crane or trolley reaches the end of its permitted travel; or when two moving cranes or trolleys come in contact.

Cab. The operator's compartment on a crane.

Cab-operated crane. A crane controlled by an operator in a cab located on the bridge or trolley.

Cantilever gantry crane. A gantry or semigantry crane in which the bridge girders or trusses extend transversely beyond the crane runway on one or both sides.

Clearance. The distance from any part of the crane to a point of the nearest obstruction.

Collectors (current). Contacting devices for collecting current from runway or bridge conductors.

Conductors, bridge. The electrical conductors located along the bridge structure of a crane to provide power to the trolley.

Conductors, runway (main). The electrical conductors located along a crane runway to provide power to the crane.

Control braking. A method of controlling crane motor speed when in an overhauling condition.

Controller, spring return. A controller which when released will return automatically to a neutral position.

Countertorque. A method of control by which the power to the motor is reversed to develop torque in the opposite direction.

Crane. A machine for lifting and lowering a load and moving it horizontally, with the hoisting mechanism and integral part of the machine. Cranes whether fixed or mobile are driven manually or by power.

Designated. Selected or assigned by the employer or the employer's representative as being qualified to perform specific duties.

Drag brake. A brake which provides retarding force without external control.

Drift point. A point on a travel motion controller which releases the brake while the motor is not energized. This allows for coasting before the brake is set.

Drum. The cylindrical member around which the ropes are wound for raising or lowering the load.

Dynamic. A method of controlling crane motor speeds when in the overhauling condition to provide a retarding force.

Emergency stop switch. A manually or automatically operated electric switch to cut off electric power independently of the regular operating controls.

Equalizer. A device which compensates for unequal length or stretch of a rope.

Exposed. Capable of being contacted inadvertently. Applied to hazardous objects not adequately guarded or isolated.

Fail-safe. A provision designed to automatically stop or safely control any motion in which a malfunction occurs.

Floor-operated crane. A crane which is pendant or nonconductive rope controlled by an operator on the floor or an independent platform.

Footwalk. The walkway with handrail, attached to the bridge or trolley for access purposes.

Gantry crane. A 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.

Hoist. An apparatus which may be a part of a crane, exerting a force for lifting or lowering.

Hoist chain. The load bearing chain in a hoist.

Hoist motion. That motion of a crane which raises and lowers a load.

Holding brake. A brake that automatically prevents motion when power is off.

Hot metal handling crane. An overhead crane used for transporting or pouring molten material.

Limit switch. A switch which is operated by some part or motion of a power-driven machine or equipment to alter the electric circuit associated with the machine or equipment.

Load. The total superimposed weight on the load block or hook.

Load block. The assembly of hook or shackle, swivel, bearing, sheaves, pins, and frame suspended by the hoisting rope.

Magnet. An electromagnetic device carried on a crane hook to pick up loads magnetically.

Main hoist. The hoist mechanism provided for lifting the maximum rated load.

Main switch. A switch controlling the entire power supply to the crane.

Man trolley. A trolley having an operator's cab attached thereto.

Master switch. A switch which dominates the operation of contractors, relays, or other remotely operated devices.

Mechanical. A method of control by friction.

Overhead crane. A crane with a movable bridge carrying a movable or fixed hoisting mechanism and traveling on an overhead fixed runway structure.

Power-operated crane. A crane whose mechanism is driven by electric, air, hydraulic, or internal combustion means.

Pulpit-operated crane. A crane operated from a fixed operator station not attached to the crane.

Rated load. The maximum load for which a crane or individual hoist is designed and built by the manufacturer and shown on the equipment nameplate(s).

Regenerative. A form of dynamic braking in which the electrical energy generated is fed back into the power system.

Remote-operated crane. A crane controlled by an operator not in a pulpit or in the cab attached to the crane, by any method other than pendant or rope control.

Rope. Refers to wire rope, unless otherwise specified.

Running sheave. A sheave which rotates as the load block is raised or lowered.

Runway. An assembly of rails, beams, girders, brackets, and framework on which the crane or trolley travels.

Semigantry crane. A gantry crane with one end of the bridge rigidly supported on one or more legs that run on a fixed rail or runway, the other end of the bridge being supported by a truck running on an elevated rail or runway.

Side pull. That portion of the hoist pull acting horizontally when the hoist lines are not operated vertically.

Span. The horizontal distance center to center of runway rails.

Standby crane. A crane which is not in regular service but which is used occasionally or intermittently as required.

Stop. A 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.

Storage bridge crane. A gantry type crane of long span usually used for bulk storage of material; the bridge girders or trusses are rigidly or nonrigidly supported on one or more legs. It may have one or more fixed or hinged cantilever ends.

Switch. A device for making, breaking, or for changing the connections in an electric circuit.

Trolley. The unit which travels on the bridge rails and carries the hoisting mechanism.

Trolley travel. The trolley movement at right angles to the crane runway.

Truck. The unit consisting of a frame, wheels, bearings, and axles which supports the bridge girders or trolleys.

Wall crane. A crane having a jib with or without trolley and supported from a side wall or line of columns of a building. It is a traveling type and operates on a runway attached to the side wall or columns.