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Spring (device)
elastic mechanical device in any shape / From Wikipedia, the free encyclopedia
A spring is a device typically made of metal, usually steel.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Ressort_de_compression.jpg/320px-Ressort_de_compression.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d5/Springs_009.jpg/640px-Springs_009.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/6/69/CompressionSpring.jpg/640px-CompressionSpring.jpg)
The metal can be compressed (squeezed). When the compression force is removed, the spring returns to its original length. The metal is usually spring steel, and it is wound tightly. There is lot of varitions with size and type, example some springs have designed for pulling, not pushing. Gas-springs are often used with vehicles tailgate.