Description

~Spring is a kind of mechanical parts use flexibility to work.

Made of elastic material parts deformation in under the action of external force, after the removal of the external force is restorable.

Also as a "spring". Usually made from spring steel.

The sort of spring is complex, the shape points, mainly has spiral spring, vortex coil spring, leaf spring, shaped spring, etc.

Most materials have different degrees of flexibility, if its bending, will be a lot of strength to recover its prototype. In human history, there must have long been noticed that the saplings and young trees branches are very flexible, because many of the original culture to use this feature, after the special door or cage on a stick, a wedge or a slipknot set down on a pole;

Once the release tension, this stick or rod will be to rebound. They use this way to catch animals and birds. In fact, the bow is in this way using the aspling elastic spring; The bow back first, and then give up, let the springback. During the middle ages, the idea began to appear on the machine, such as spinning machine, lathe, drilling machine, grinding machine and saw.

Operator is given by hand or foot pedal down stroke, the work machine down, then with a piece of rope and fixed on a mechanical lever back, reciprocating motion.