1. A horizontal cylinder about which rope or wire rope is wound in a hoisting mechanism. 2. A hollow or solid cylinder or barrel that acts on, or is acted upon by, an exterior entity, such as the drum in a drum brake. Also known as hoisting drum.


Related Terms

BIRDCAGED WIRE

Wire rope whose strands have been distorted into the shape of a birdcage by a sudden release of a load during a hoisting operation.

TYE

A chain or rope used for hoisting or lowering a yard. A tye runs from the horizontal center of a given yard to a corresponding mast and from there down to a tackle. Sometimes specifically called a chain tye or a rope tye.

WHIPPING

Means of fixing a fibre rope so that the strands will not unravel. On wire rope it is called seize or wrap. Used tape or light wire. Can braze end of wire if going through drum or winch and take wire off.

BULLET

  1. A conical-nosed cylindrical weight, attached to a wire rope or line, either notched or seated to engage and attach itself to the upper end of a wire line core barrel or other retrievable or retractable device that has been placed in a borehole. Also known as bug; godevil; overshot. 2. A scraper with self-adjusting spring blades, inserted in a pipeline and carried forward by the fluid pressure, clearing away accumulations or debris from the walls of a pipe. Also known as go-devil. 3. A bullet-shaped weight or small explosive charge dropped to explode a charge of nitroglycerin placed in a borehole. Also known as go-devil. 4. An electric lamp covered by a conical metal case, usually at the end of a flexible metal shaft. 5. See torpedo.

CARGO WINCH

A motor-driven hoisting machine for cargo having a drum around which a chain or rope winds as the load is lifted.

SNOTTER

A wire or rope with eyes in each end for cargo work.

PARBUCKLE

A hoisting method using a strop of rope fastened to the boat with the two ends passed down and around the object in the water and back up to the hauling point- hence mechanical advantage is achieved.

HOISTING ROPE

A special flexible wire or nylon rope for lifting purposes.

MERCATOR MAP PROJECTION

A conformal cylindrical map projection in which the surface of a sphere or spheroid, such as the earth, is developed on a cylinder tangent along the equator. Meridians appear as equally spaced vertical lines and parallels as horizontal lines drawn farther apart as the latitude increases, such that the correct relation- ship between latitude and longitude scales at any point is maintained. The expansion at any point is equal to the secant of the latitude of that point, with a small correction for the ellipticity of the earth. The Mercator is not a perspective projection. Since rhumb lines appear as straight lines and directions can be measured directly, this projection is widely used in navigation. If the cylinder is tangent along a meridian. a transverse Mercator map projection results; if the cylinder is tangent along an oblique great circle, an oblique Mercator map projection results. Also called EQUATORIAL CYLINDRICAL ORTHOMORPHIC MAP PROJECTION.

CLOSING MACHINE

A machine for manufacturing wire rope by braiding wire into strands, and strands into rope. Also known as stranding machine.

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