Crane Industries
- Conical Hoist Spares
- Shafts
- Rope Drums
- Brake Discs
- Rollers
- Housing
- Pulleys
- Rotor Shafts
- R B Support
- Wheels
- Motor Stampings
A pulley is a simple machine that uses a wheel that has a groove in it. A rope or cable fits into the groove. The wheel helps the rope move.
A pulley can be placed above a heavy object that you want to lift. You pull down on the rope to lift the object. It is easier to lift an object by pulling down than by pulling up. When you pull down, you can use the weight of your body to help you.
A fixed pulley stays in one place. Your muscles apply force to move something. When you lift an object without using a machine, the direction of force is up. Using a fixed pulley changes the direction of the force. The direction of the force is down, but the object is lifted up. An example of a fixed pulley is a fishing rod.
A movable pulley changes position. It is not attached to a structure. The movable pulley moves up when the rope is pulled. It takes less force to lift an object with a movable pulley than with a fixed pulley. An example of a movable pulley is a modern elevator.
A compound pulley is made up of two or more pulleys. A compound pulley is often used on a large sailboat using many different ropes and pulleys.
