PULLEY • DICCIONARIO INGLES.COM • Definition of Pulley

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/pˈʊli/ Listen

noun

Pulley n. (pl. pulleys) (Mach.) A wheel with a broad rim, or grooved rim, for transmitting power from, or imparting power to, the different parts of machinery, or for changing the direction of motion, by means of a belt, cord, rope, or chain. Note: The pulley, as one of the mechanical powers, consists, in its simplest form, of a grooved wheel, called a sheave, turning within a movable frame or block, by means of a cord or rope attached at one end to a fixed point. The force, acting on the free end of the rope, is thus doubled, but can move the load through only half the space traversed by itself. The rope may also pass over a sheave in another block that is fixed. The end of the rope may be fastened to the movable block, instead of a fixed point, with an additional gain of power, and using either one or two sheaves in the fixed block. Other sheaves may be added, and the power multiplied accordingly. Such an apparatus is called by workmen a block and tackle, or a fall and tackle. See Block. A single fixed pulley gives no increase of power, but serves simply for changing the direction of motion.

Band pulley, or Belt pulley, a pulley with a broad face for transmitting power between revolving shafts by means of a belt, or for guiding a belt.

Cone pulley. See Cone pulley.

Conical pulley, one of a pair of belt pulleys, each in the shape of a truncated cone, for varying velocities.

Fast pulley, a pulley firmly attached upon a shaft.

Loose pulley, a pulley loose on a shaft, to interrupt the transmission of motion in machinery. See Fast and loose pulleys, under Fast.

Parting pulley, a belt pulley made in semicircular halves, which can be bolted together, to facilitate application to, or removal from, a shaft.

Pulley block. Same as Block, n. 6.

Pulley stile (Arch.), the upright of the window frame into which a pulley is fixed and along which the sash slides.

Split pulley, a parting pulley.

verb

Pulley v. t. To raise or lift by means of a pulley. (R.)

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Etymology of 'Pulley'

Collaborative International Dictionary of English 0.48

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"Pulley" Quotes from Famous Books

... but never seriously thought of her as a wife, until one day a party visited the parish church, whose old tower was often ascended for the fine view it commanded. At this time the tower was under repair, and the masons were drawing up materials in a basket, which, worked by rope and pulley, swung on a beam protruding from the top of the tower. The basket had just been lowered for a fresh load of stones, when Letitia exclaimed, "Wouldn't it be fine fun to get into the basket, and be hauled up to the top of the tower?—how astonished the workmen ...

— Handy Andy, Volume One - A Tale of Irish Life, in Two Volumes • Samuel Lover

... mathematics there in the school of Euclid. He not only distinguished himself as a pure mathematician and astronomer, and as the founder of the theory of statics, but he discovered the law of specific gravity, and constructed some of the most useful machines in the mechanic arts, such as the pulley and the hydraulic screw. His works are written in the Doric dialect. Apollonius of Perga (221-204 B.C.) distinguished himself in the mathematical department by his work on "Conic Elements." Eratosthenes was not only prominent in the science of chronology, but was also the founder ...

— Handbook of Universal Literature - From The Best and Latest Authorities • Anne C. Lynch Botta

... simple machines devised long ago by our remote ancestors. These simple devices are known to-day, as (1) the lever, represented by a crowbar, a pitchfork; (2) the inclined plane, represented by the plank upon which barrels are rolled into a wagon; (3) the pulley, represented by almost any contrivance for the raising of furniture to upper stories; (4) the wheel and axle, represented by ...

— General Science • Bertha M. Clark

... the lumbermen, attired in rough corduroy, red shirts, and big boots, balance themselves skillfully on some of the slippery trunks, while with pole and boat-hook propelling other great ones to the gaping mouths in the bow of the vessel. Then horse, rope, pulley, and windlass are brought into play to draw the log into the hold and place it properly among other monarchs of the forest, thus ignominiously laid low, and become what "Mantalini" would style "a damp, moist, unpleasant lot." ...

— Over the Border: Acadia • Eliza Chase

... wire are bent at right angles and run into the board. The plate will consequently turn on this axis, as on a hinge. At the top of the plate d, a small projection of the tin turns inwards, and to this, one end of the cord m m is attached. This cord passes back from d to a small pulley at the upper part of the board, and at the tower end of it a tassel, loaded so as to be an exact counterpoise to the card, is attached. By raising the tassel, the plate will of course fall over forward till it is stopped by the part b striking the board, when it will be in a ...

— The Teacher - Or, Moral Influences Employed in the Instruction and - Government of the Young • Jacob Abbott

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