Glossar y of Com mon Crane Terms:
Adjustable brakes:
Bridge beam: Traveling beam connected to end trucks - supports trolley hoist and load.
Bumpers: Energy absorbing device mounted on end trucks or trolley that reduces impact when the truck or trolley contacts either its end stop or another truck or trolley.
Capacity: Maximum rated load which a crane is designed to carry. Commonly expressed in Tons. (1 Ton = 2,000 lbs.).
Drop stops: Means to limit the drop of a bridge or trolley in case of wheel or axle failure.
Electronic Acceleration Control (EAC): Electronic control for adjusting rate of crane acceleration; also known as Electronic Soft Start.
End truck:
Festooning: Wiring and support system that delivers power to trolley hoist across bridge or runway beam.
Rail sweeps: Device designed to clear obstructions from wheel running surface.
Runway beam: Stationary beams that support crane and load. Commonly fabricated from S or W beams or patented track.
Runway electrification: Delivers power to crane as it travels along runway.
Span: Dimension from one runway centerline to the other runway centerline.
System max wheel load: Maximum load exerted on runway beams for a crane loaded to its rated capacity. It occurs when trolley hoist is located at its maximum end approach and includes an allowance for vertical inertial forces associated with electric hoists. This value is expressed for Series 3 cranes as lbs/wheel for top running and lbs/wheel pair for underhung cranes. For Series HPC 500 cranes, both top running and underhung are lbs/wheel pair.
Top running: Crane type that travels on top of rail or bar attached to runway beams.
Underhung: Crane type that travels on the lower flange of runway beams.
26Com pliance
In order to meet requirements of the Crane Manufacturers Association of America (CMAA), the National Electric Code (NEC) and the American National Standards Institute (ANSI/ASME), Harrington cranes include:
•Thermal protection for all motors.
•Stationary crane wires that are enclosed in conduit.
•Rubber bumpers for crane and powered trolleys.
•Hoists load tested to 125% of rated capacity.
•Drop stops for cranes.
•Rail sweeps for top running and underhung cranes.