<Ul> <Li> Belleville washer or Belleville spring--a disc shaped spring commonly used to apply tension to a bolt (and also in the initiation mechanism of pressure - activated landmines) </Li> <Li> Constant - force spring--a tightly rolled ribbon that exerts a nearly constant force as it is unrolled </Li> <Li> Gas spring--a volume of compressed gas </Li> <Li> Ideal Spring--a notional spring used in physics--it has no weight, mass, or damping losses . The force exerted by the spring is proportional to the distance the spring is stretched or compressed from its relaxed position . </Li> <Li> Mainspring--a spiral ribbon shaped spring used as a power store in clockwork mechanisms: watches, clocks, music boxes, windup toys, and mechanically powered flashlights </Li> <Li> Negator spring--a thin metal band slightly concave in cross-section . When coiled it adopts a flat cross-section but when unrolled it returns to its former curve, thus producing a constant force throughout the displacement and negating any tendency to re-wind . The most common application is the retracting steel tape rule . </Li> <Li> Progressive rate coil springs--A coil spring with a variable rate, usually achieved by having unequal pitch so that as the spring is compressed one or more coils rests against its neighbour . </Li> <Li> Rubber band--a tension spring where energy is stored by stretching the material . </Li> <Li> Spring washer--used to apply a constant tensile force along the axis of a fastener . </Li> <Li> Torsion spring--any spring designed to be twisted rather than compressed or extended . Used in torsion bar vehicle suspension systems . </Li> <Li> Wave spring--any of many wave shaped springs, washers, and expanders, including linear springs--all of which are generally made with flat wire or discs that are marcelled according to industrial terms, usually by die - stamping, into a wavy regular pattern resulting in curvilinear lobes . Round wire wave springs exist as well . Types include wave washer, single turn wave spring, multi-turn wave spring, linear wave spring, marcel expander, interlaced wave spring, and nested wave spring . </Li> </Ul> <Li> Belleville washer or Belleville spring--a disc shaped spring commonly used to apply tension to a bolt (and also in the initiation mechanism of pressure - activated landmines) </Li> <Li> Constant - force spring--a tightly rolled ribbon that exerts a nearly constant force as it is unrolled </Li> <Li> Gas spring--a volume of compressed gas </Li>

Practical examples where different types of springs are used