Coil spring
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A Coil spring, also known as a helical spring, is a mechanical device, which is typically used to store energy and subsequently release it, to absorb shock, or to maintain a force between contacting surfaces. They are made of an elastic material formed into the shape of a helix which returns to its natural length when unloaded.
Coil springs are a special type of torsion spring, the material of the spring acts in torsion when the spring is compressed or extended.
The two usual types of coil spring are:
- Tension coil springs which are designed to resist stretching. They usually have a hook or eye form at each end for attachement.
- Compression coil springs are designed to resist being compressed. A typical use for compression coil springs is in car suspension systems.
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