When was pulleys first used

It is used to change the direction of an applied force that is needed to lift a particular object. The force that is exerted in order to lift an object can reduced, provided that the force must act from a longer distance otherwise the force that will be required is equal to the force required without the pulley system. The pulley machine has a lot of modern-day applications and these can be found in cranes, airplanes and automobiles. The pulley system created by Archimedes was documented by Plutarch, which was a block and tackle type of pulley system.

Ice skate.. Arched bridge.. Brazing and soldering.. Sewage system.. Standard measures.. Wrought iron.. Enclosed harbor.. Water filter.. Mechanical lock.. Rubber ball.. Shadow clock.. Water clock.. Pontoon bridge.. Battering ram.. Metal anchor.. Artificial limb.. Chain mail.. Magnetic compass.. Blast furnace.. Moldboard plow.. Dry dock.. Antikythera mechanism.. Belt drive.. Blown glass.. Genko forest belt..

Follow Us on. Chennai Coimbatore Madurai Puducherry Trichy. Jodhpur Vijayawada Visakhapatnam Lucknow Nagpur. Bengaluru Noida Agra Patna kochi. Essentially, Archimedes improved on the invention of the single pulley by proving his theory that a pulley operates much like a lever.

Both devices reduce the amount of effort the operator needs to exert to move an object. Showing that several pulley wheels dispersed the weight more than a single pulley, he proved the formula mechanical advantage MA. MA is the number of rope sections that determines how much easier it is to lift or haul the object. This device consisted of huge beams that swung out.

One version dropped weights to punch holes through invading ships to sink them. Another made use of a claw to raise, shake or capsize a ship. Other early applications of pulleys in ancient warfare were crossbows and catapults among others.

Though the robot did not survive to the present day, it appears that the device was capable of walking, sitting, and jaw movement through a system of pulleys and gears. He also incorporated some of the concepts in the design of planetary exploration robots for NASA.

Through the years, pulleys found their way to the dark side of history. Warfare and torture devices became all the more gruesome with the mechanisms involved. One such device is the strappado, mostly used to extract information from alleged heretics and witches. This device consisted of a pulley over a rope that passed over a beam or hook on the roof and was tied to the hands of the victim.

Additional weight could be added to the feet. The strappado dislocated joints and limbs causing long-term damage to nerves and muscles, and permanent paralysis and loss of sensation in the arms. Another torture device was the upright jerker. A cord was wrapped around the neck of the condemned who was positioned on a platform. Rather than dropping through a trap door, a system of weights and pulleys would jerk the victim into the air violently.

Today, pulleys have a variety of configurations. A class 1, or fixed pulley , is stationary. It redirects the force in the rope or cable. A single anchored pulley has the mechanical advantage of one.