Pulley
['pʊlɪ] or ['pʊli]
Definition
(noun.) a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope.
Inputed by Emilia--From WordNet
Definition
(v. t.) 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.
(b. t.) To raise or lift by means of a pulley.
Typist: Wanda
Definition
n. a wheel turning about an axis and having a groove on its rim in which a cord runs used for raising weights:—pl. Pull′eys.—ns. Pull′ey-block a shell containing one or more sheaves the whole forming a pulley; Pull′ey-shell the casing of a pulley-block.
Edited by Guthrie
Examples
- The opening for putting in the ice, shown just under the pulley in the cut, has two doors with a space between; each door a foot thick. William K. David. Secrets of Wise Men, Chemists and Great Physicians.
- The lever and the pulley, lathe s, picks, saws, hammers, bronze operating-lances, sundials, water-clocks, the gnomon (a vertical pillar for determining the sun's altitude) were in use. Walter Libby. An Introduction to the History of Science.
- Such a pulley is known as a fixed pulley. Bertha M. Clark. General Science.
- The animals are driven into a catching pen at 1, where they are strung up by one leg, and secured to a traveling pulley on an overhead rail. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
- A vertical shaft D is rotated constantly by a band on pulley _d_. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
- By means of a pulley, a force in one direction produces motion in the opposite direction. Bertha M. Clark. General Science.
- If we employ a stationary pulley, as in Figure 109, we do not change the force, because the force required to balance the load is as large as the load itself. Bertha M. Clark. General Science.
- The revolving disk-shaped cutter E is rotated by a pulley and belt from a drum, which latter is made long enough to accommodate the travel of the frame. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
- No surface can be made perfectly smooth, and when a barrel rolls over an incline, or a rope passes over a pulley, or a cogwheel turns its neighbor, there is rubbing and slipping and sliding. Bertha M. Clark. General Science.
- A pulley and belt, connected to a circular saw larger than the motor, permitted large logs of oak timber to be sawed with ease with the use of two small cells of battery. Frank Lewis Dyer. Edison, His Life and Inventions.
- The steam engine of this truly ingenious contrivance, together with the boiler and the driving pulley, weighed only sixteen ounces. Various. The Wonder Book of Knowledge.
- The weight is divided equally between the two parts of the string which passes around the pulley, so that each strand bears only one half of the burden. Bertha M. Clark. General Science.
- The bed is run in and out by turning a crank on a shaft which has a pulley and belt passing around it. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
- A small electrical motor 1, run by a storage battery or electric light wires, turns a belt 3, and rotates pulley 4 and a long horizontal cylinder 5 running beneath the keyboard. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
- It is sometimes more convenient to move a load in one direction rather than in another, and the pulley in its simplest form enables us to do this. Bertha M. Clark. General Science.
- Instead of the rope and pulleys Newcomen fastened a walking-beam to the end of the piston, and attached a pump-rod to the other end of the walking-beam. Rupert S. Holland. Historic Inventions.
- A combination of pulleys called block and tackle is used where very heavy loads are to be moved. Bertha M. Clark. General Science.
- This seems most marvelous until we learn that the lines are pulled back and forth by pulleys at the window and at a distant support. Bertha M. Clark. General Science.
- This was an endless steel belt serrated on one edge, mounted on pulleys, and driven continuously by the power of steam through the hardest and the heaviest work. William Henry Doolittle. Inventions in the Century.
- Sometimes we received wine and victuals from below, which were drawn up by pulleys. Jonathan Swift. Gulliver's Travels into Several Remote Nations of the World.
- An effective arrangement of pulleys known as block and tackle. Bertha M. Clark. General Science.
- In Figure 111 the upper block of pulleys is fixed, the lower block is movable, and one continuous rope passes around the various pulleys. Bertha M. Clark. General Science.
- He fastened the upper end of the piston to a rope, which passed over two pulleys. Rupert S. Holland. Historic Inventions.
- At R and R′ are two pulleys connected by gut. William K. David. Secrets of Wise Men, Chemists and Great Physicians.
- By means of pulleys, awnings are raised and lowered, and the use of pulleys by furniture movers, etc. Bertha M. Clark. General Science.
- So they attached levers, pulleys, ratchets and windlasses, until at last they reached the size of the great siege cross-bows, weighing eighteen pounds. Various. The Wonder Book of Knowledge.
- After some consideration of the gearing question, it was decided to employ belts instead of the friction-pulleys. Frank Lewis Dyer. Edison, His Life and Inventions.
- In our childhood many of us saw with wonder the appearance and disappearance of flags flying at the tops of high masts, but observation soon taught us that the flags were raised by pulleys. Bertha M. Clark. General Science.
Typist: Natalie