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Crane Glossary
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DEAD LOADS:
The loads on a structure which remain in a fixed position relative to the structure. On a crane bridge such loads include the girders, footwalk, cross shaft, drive units, panels, etc.
DEFLECTION:
Displacement due to bending or twisting in a vertical or lateral plane, caused by the imposed live and dead loads.
DIAPHRAM:
A plate or partition between opposite parts of a member, serving a definite purpose in the structural design of the member.
DRIVE:
The assembly of the motor and gear unit used to propel the bridge or trolley.
DRIVE GIRDER:
The girder on which side the bridge drive machinery is mounted.
DRUM:
The cylindrical member around which the hoisting ropes are wound for lifting and lowering the load.
DUMMY CAB:
An operator’s compartment or platform on a pendant or radio controlled crane, having no permanently mounted electrical controls, in which an operator may ride while controlling the crane.
DYNAMIC LOWERING:
A method of control by which the hoist motor is so connected in the lowering direction, that when it is over-hauled by the load, it acts as a generator and forces current either through the resistors or back into the line. i.e., regenerative braking.
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