B on American Crane & Equipment Corp.

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


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		BEAM Rolled structural steel member typically used as a bridge girder for short span or low capacity cranes.




		BEAM FLANGE Flanges are the top and bottom flat portions of an I or W shaped beam. The flange width describes the horizontal dimension of an I or W shaped beam when it’s cross-section is seen standing upright.




		BEARING LIFE EXPECTANCY The L10 life of an anti-friction bearing is the minimum expected life, hours, of 90 percent of a group of bearings which are operating at a given speed and loading. The average expected life of the bearings is approximately five times the L10 life.




		BOGIE A type of short end truck, used to allow greater distribution of crane wheel loads, by placing multiple wheels at each corner of the crane.




		BOX SECTION The rectangular cross section of girders, trucks or other members, comprised of 2 rolled steel side plates, a top plate, and a bottom plate.




		BRAKE A device, other than a motor, used for retarding or stopping motion by friction or power means.




		BRANCH CIRCUIT The circuit conductors between the final over current device protecting the circuit and the outlet(s).




		BRIDGE That part of an overhead crane consisting of girders, trucks, end ties, walkway and drive mechanism which carries the trolley and travels in a direction parallel to the runway.




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




		BRIDGE DRIVE The motor and gear reduction unit designed to propel the bridge.




		BRIDGE ELECTRIFICATION The electrical cable that brings power to the hoist and trolley, and control signals to entire crane. This wiring runs the full span of the crane and moves with the trolley and hoist.




		BRIDGE GIRDER The main horizontal structural member(s) of the crane bridge supported by the end trucks.




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




		BRIDGE REPAIR TRAVELERS Also called BRIDGE MAINTENANCE TRAVELERS. Self-propelled, under-running platforms specifically designed to allow personnel access to underside of bridge structures.




		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 into contact.