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What is made up of both fixed and movable pulleys

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nancy8
The Summerlift Cable lift models permit cabinet builders to take advantage of cables & pulleys & strategic leverage to accomplish load lifts. This provides the cabinet maker with maximum design latitude.

WHAT IS A PULLEY?
A pulley is a simple machine made with a rope, belt or chain wrapped around a wheel. The pulley is usually used to lift a
heavy object (load).                       WHAT DOES A PULLEY DO?
                      A pulley changes the  direction of the force, making it easier to lift things                       ARE ALL PULLEYS THE SAME?
                      No, they are not. There are three types of pulleys:                        *A FIXED PULLEY
                       *A MOVABLE PULLEY and
                       *A COMBINED PULLEY
 
  A single pulley changes the direction of the lifting force. For  example, if you are lifting a heavy object with a single pulley anchored to the ceiling, you can pull down on the rope to lift the object instead  of pushing up. The same amount of effort is needed as without a pulley, but it feels easier because you are pulling down.
A fixed pulley is the only pulley that when used individually, uses more effort than the  load to lift the load from the ground. The fixed pulley when attached to an unmovable object e.g. a ceiling or wall, acts as a first class lever with the fulcrum being located at the axis but with a minor change, the bar becomes a rope.  The advantage of the fixed pulley is that you do not have to pull or push  the pulley up and down. The disadvantage is that you have to apply more effort than the load
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