<P> Types of coil spring are: </P> <Ul> <Li> Tension / extension coil springs, designed to resist stretching . They usually have a hook or eye form at each end for attachment . </Li> <Li> Compression coil springs, designed to resist being compressed . A typical use for compression coil springs is in car suspension systems . <Ul> <Li> Volute springs are used as heavy load compression springs . A strip of plate is rolled into the shape of both a helix and a spiral . When compressed, the strip is stiffer edge - on than a wire coil, but the spiral arrangement allows the turns to overlap rather than bottoming out on each other . </Li> </Ul> </Li> <Li> Torsion springs, designed to resist twisting actions . Often associated to clothes pegs or up - and - over garage doors . </Li> </Ul> <Li> Tension / extension coil springs, designed to resist stretching . They usually have a hook or eye form at each end for attachment . </Li> <Li> Compression coil springs, designed to resist being compressed . A typical use for compression coil springs is in car suspension systems . <Ul> <Li> Volute springs are used as heavy load compression springs . A strip of plate is rolled into the shape of both a helix and a spiral . When compressed, the strip is stiffer edge - on than a wire coil, but the spiral arrangement allows the turns to overlap rather than bottoming out on each other . </Li> </Ul> </Li>

What is the purpose of a vehicle coil spring