PULLEY • DICTIONARY ONE.COM • Definition of Pulley

Add this Dictionary
to your website!
See more options...

/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.)

See images of 'Pulley'

Etymology of 'Pulley'

Collaborative International Dictionary of English 0.48

Share |

Add this dictionary
to your browser search bar

"Pulley" Quotes from Famous Books

... the lathe should range from 2400 to 3000 revolutions per minute when the belt is on the smallest step of the cone pulley. At this speed stock up to 3" in diameter can be turned with safety. Stock from 3" to 6" in diameter should be turned on the second or third step, and all stock over 6" on the last step. The speed at which a lathe should run depends entirely upon the nature of the work to ...

— A Course In Wood Turning • Archie S. Milton and Otto K. Wohlers

... befell until I was safely aboard ship. I was in charge of a fatigue party, bringing hay from the bulkheads of the ship up on to the different decks for the horses; there was a pulley leading to the bottom of the boat by means of which the hay was hoisted up, and in going down each man gripped it and was slowly lowered. On the trip down the men would cling to the rope, two or three at a time, with about ten to twenty feet of space between ...

— S.O.S. Stand to! • Reginald Grant

... morning. The building itself, an old warehouse, is newly whitewashed. Its gabled end projects into the yard in the middle, with a door on the ground floor, and another in the loft above it without any balcony or ladder, but with a pulley rigged over it for hoisting sacks. Those who come from this central gable end into the yard have the gateway leading to the street on their left, with a stone horse-trough just beyond it, and, on the right, a penthouse shielding a table from the ...

— Major Barbara • George Bernard Shaw

... the aeronaut wishes to descend by the parachute, all that is required is, after he has slipped down from the car of the balloon to that of the parachute, to loosen the rope which binds the latter to the former, which is done by means of a pulley. In an instant the aeronaut is launched into space with a rapidity in comparison with which the wild flights of the balloon are but gentle oscillations. But in a few moments, the air rushing into the folds of the parachute, forces them open like an umbrella, ...

— Wonderful Balloon Ascents - or, the Conquest of the Skies • Fulgence Marion

... well-known inventor, was by birth a Syracusan. Now this old geometrician, who had passed through seventy-five seasons, had built many powerful engines, and by the triple pulley, with the aid of the left hand alone, could launch a merchant ship of fifty thousand medimni burden. And when Marcellus once, the Roman general, assaulted Syracuse by land and sea, this man first by his engines drew up some merchantmen, and lifting ...

— Dio's Rome, Vol VI. • Cassius Dio

More quotes...