A hand-operated derrick which has a nearly vertical pole supported by guy ropes; the load is raised on a rope that passes through a pulley at the top and over a winch at the foot. Also known as guyed-mast derrick; pole derrick; standing derrick.


Related Terms

MAGNETIC PULLEY

Magnetized pulley device for a conveyor belt; removes tramp iron from dry products being moved by the belt.

LOOPING

Laying a parallel pipeline along another, or along just a section of it, to increase loose pulley

IDLER PULLEY

A pulley used to guide and tighten the belt or chain of a conveyor system.

SHEAVE

Pulley in the block

BLOCK

A pulley with one or more sheaves (grooves), over which a rope is roved. It can be used to chage the direction of the rope, or in pairs used to form a tackle.

CHEEKS PLATES

The sides of a block that retain the pulley sheaves.

END GUIDE ASSEMBLY

One of the four pulley units that guide the cable of a vehicular cable ferry across the ferry (also called pedestal).

ROLLER FAIRLEAD

An arrangement with a pulley wheel to minimise chafing on lines pulled onto a vessel.

ARC OF CONTACT

1. The angular distance over which a gear tooth travels while it is in contact with its mating tooth. Also known as arc of action. 2. The angular distance a pulley travels while in contact with a belt or rope.

ATWOOD MACHINE

A device comprising a pulley over which is passed a stretch-free cord with a weight hanging on each end.

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