![]() ![]() Wells: Old-fashioned “wishing well” style water wells use a simple pulley system to hoist the bucket out of the well.Elevators make use of a system of several pulleys and counterweights to provide the lift system with both power and safety. Elevators: Elevators work via a powerful electronic pulley system.They can also be used to provide power from one shaft to another. In addition to lifting things, pulleys can be used singly or with many pulleys working together to transport people or things. Pulleys can be found everywhere to help make tasks easier. A pulley is a simple machine made with a wheel and a rope, cord, or chain. The original primary use for pulleys was to make it easier to lift heavy items. ![]() In the case of a pulley supported by a frame or shell that does not transfer power to a shaft, but is used to guide the cable or exert a force, the supporting shell is called a block, and the pulley may be called a sheave. Plutarch’s Parallel Lives recounts a scene where Archimedes proved the effectiveness of compound pulleys and the block-and-tackle system by using one to pull a fully laden ship towards him as if it was gliding through water.Ī pulley is a wheel on an axle or shaft that is designed to support movement and change of direction of a taut cable or belt, or transfer of power between the shaft and cable or belt. 10-70 CE) identified the pulley as one of six simple machines used to lift weights. The Greek mathematician Archimedes (3rd century BC) is said to have used compound pulleys to pull a ship onto land. Pulleys are also assembled as part of belt and chain drives in order to transmit power from one rotating shaft to another Pulleys are assembled to form a block and tackle in order to provide a mechanical advantage to apply large forces. One or more independently rotating pulleys can be used to gain a mechanical advantage, particularly when lifting weights. ![]() In belt drives, pulleys are attached to shafts at their axles, and power is transmitted between the shafts by endless belts running over the pulleys. Pulleys with grooved edges are called sheaves. Pulleys are used individually or in combination to transmit power and motion. A pulley is a wheel that carries a flexible rope, cord, cable, chain, or belt on its rim. ![]()
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