Extension Springs are metal springs which absorb and store energy by offering resistance to a pulling force. Typically, extension springs are made from round wire and are close wound with initial tension. Extension applications include tape cassette players, balance scales, garage door springs, trampoline springs, washing machines and applications which requiring various types of tensioning devices. Various types of ends are used to attach the extension spring to the source of the force. Source:metalsprings.com
Source:
http://metalsprings.com/
