is a combination of fixed and movable pulleys traversed by a single cord having one end anchored to a fixed point.
technical elements of the system are: *
fixed pulley's mission is to change the direction of the force (power) we exert on the rope. Exercising power facilitates downstream lifting, because we can help our own weight.
*
The movable pulley mission is to provide mechanical gain of the system. Generally, each movable pulley provides a gain equal to 2. *
rope (cable) transmits forces between the elements. Its tensile strength must be based on the value of the resistance and the mechanical gain of the system, which in turn depends on the number of running blocks and their combination with the fixed.
The gain of each system depends on the combination made with the fixed and movable pulleys, for example, we may gain 2, 3 or 4 to employ a fixed pulley and a mobile, two fixed and mobile or fixed and two mobile respectively. Two pulleys hoist
three pulleys hoist hoist
three pulleys
This system has the disadvantage that the distance that an object can be raised depends on the distance between pulleys (usually between the first two pulleys, the fixed and mobile first). To fix mechanisms are used in several mobile and fixed pulleys respectively coupled common axes, are traversed by the same rope.
hoist pulleys and mobile number
Limitation on use of hoists
technical elements of the system are: *
fixed pulley's mission is to change the direction of the force (power) we exert on the rope. Exercising power facilitates downstream lifting, because we can help our own weight.
*
The movable pulley mission is to provide mechanical gain of the system. Generally, each movable pulley provides a gain equal to 2. *
rope (cable) transmits forces between the elements. Its tensile strength must be based on the value of the resistance and the mechanical gain of the system, which in turn depends on the number of running blocks and their combination with the fixed.
The gain of each system depends on the combination made with the fixed and movable pulleys, for example, we may gain 2, 3 or 4 to employ a fixed pulley and a mobile, two fixed and mobile or fixed and two mobile respectively. Two pulleys hoist
three pulleys hoist hoist
three pulleys
This system has the disadvantage that the distance that an object can be raised depends on the distance between pulleys (usually between the first two pulleys, the fixed and mobile first). To fix mechanisms are used in several mobile and fixed pulleys respectively coupled common axes, are traversed by the same rope.
hoist pulleys and mobile number
Limitation on use of hoists
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