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Crane Glossary
a b c d e f g h i j k l m n o p q r s t u v w x y z
BEARING LIFE EXPECTANCY:
The L-10 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 bearing is approximately five times the L-10 life.
BHN:
Brinell hardness number, measurement of material hardness.
BOX SECTION:
The rectangular cross section of girders, end trucks or other members enclosed on four sides.
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 overcurrent device protecting the circuit and the outlet(s).
BRIDGE:
That part of an overhead crane consisting of girders, end 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 and hoisting machineries.
BRIDGE RAIL:
The rail supported by the bridge girders on which the trolley travels.
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.
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