Fool's Play :- Pulley lift system (Mechanics)

Lifting heavy loads are very common in the industries.For example, lifting weights of products being manufactured are quit common in factories. Now while designing such lifting machines, a designer may face various constraints, which can restrict his choice to use heavy power machine elements like motors or actuators to deal with such loads.

Here is an very simple, cost effective trick, which is, by using pulley and wire rope system to divide the weight into various wire rope connections, resulting in reduction in load for actuators or motors to lift the same weight. But the actuator or motor has to pull rope for longer distance though. Diagram given below, explain it quit well.

W= Weight, T= Tension , F= Force in Newtons, H= Height.

All you need is :

1. A wire rope , which can be standard and can be chosen according to the weight to lift., 

2. A Sheave ( Pulley), which is also available as standard part and is chosen according to wire rope chosen,

3. And then you need a shaft, bearing, sheet-metal housing and nuts to make the coupling. 

Various other ways to make pulley connection according to space constraints are given below: