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A machine designed for moving and lifting weight by means of a movable projecting arm or a horizontal beam, which is able to travel over a certain distance.



Related Terms

CRAMPOON SEE CRAMPON. CRANE

A hoisting machine with a power-operated inclined or horizontal boom and lifting tackle for moving loads vertically and horizontally.

DIP NEEDLE

A magnetic needle suspended so as to be free to rotate about a horizontal axis. An instrument using such a needle to measure magnetic dip is called a DIP CIRCLE. A dip needle with a sliding weight that can be moved along one of its arms to balance the magnetic force is called a HEELING ADJUSTER.

FAN

A machine consisting of a rotor and housing for moving air or gases at relatively low-pressure differentials.

BRIDGE CRANE

A hoisting machine in which the hoisting apparatus is carried by a bridge-like structure spanning the area over which the crane operates.

DORR CLASSIFIER

A horizontal flow classifier consisting of a rectangular tank with a sloping bottom, a rake mechanism for moving sands uphill along the bottom, an inlet for feed, and outlets for sand and slime.

THREE-ARM PROTRACTOR

An instrument consisting of a circle graduated in degrees, to which is attached one fixed arm and two arms pivoted at the center and provided with clamps so that they can be set at any angle to the fixed arm, within the limits of the instrument. It is used for finding a ship’s position when the horizontal angles between three fixed and known points are measured.

BACKHOE

An excavator fitted with a hinged arm to which is rigidly attached a bucket that is drawn toward the machine in operation. Also known as backacter; backdigger; dragshovel; pullshovel.

HORIZONTAL DRILLING MACHINE

A drilling machine in which the drill bits extend in a horizontal direction.

CENTRIFUGAL FAN

A machine for moving a gas, such as air, by accelerating it radially outward in an impeller to a surrounding casing, generally of scroll shape.

AUTOMATIC COUPLING

  1. A device automated guided vehicle system 2. A computer-controlled system that uses pallets and other interface equipment to transport workpieces to numerically controlled machine tools and other equipment in a flexible manufacturing system, moving in a predetermined pattern to ensure automatic, accurate, and rapid work-machine contact.

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