Elastic elements can be bent on a reel wound edges protruding cylinder. Elastic elements used in yarn, thread, rope, cable, chain, tape, film, etc.. can have very different structures. Today it finds a field of this element, BC have been used since the fifth century. Spinning them in daily life, such as photographic film and for the preservation of these intertwined elements is used. But the main important areas of application, with the help of elastic elements of power and strength for the transport, mechanical used as an element. Marine, in particular, a sailing ship is one of the most important assembly. Conveyors, hoists and crane handling and lifting machines, such as a wide area to find. A different area of the tank is to support and drive the pallet system.

Spools, usually a rope or chain to raise the burden of using such elements, change the direction of force, to facilitate removal of the load or tackle pulley systems, such as assistance with the aim of reducing the required lifting force is used. Pulley, the hole in the wedge through the channel and the core pernosunun reel, rope or chain through the ring containing the channel and the two side wheels to each other, combining support from the body occurs. The rope or chain pulled by a yellow rim canal to the tip of the attached load to be removed, and the force applied to the other end is the desired direction. Withdrawal of the forces applied with rope pulley makes lifting the burden to bring about the return. Wheels or rollers of hoop sections, cables and ropes to cross the bottom of the rounded "V" shaped in the form of a groove is made. chain for the transition of the chain wheel of a bore to sit in the channel format is used.