Lee Spring extension springs complete the assembly

Extension Springs from Lee Spring provide a solution to problems of linking components in a way that absorbs and stores energy, as well as creating resistance to a pulling force. They are pre-loaded to create an initial resistance which keeps linked components in place with a variety of end types possible. Where pre-load is not required they can be supplied with inter-coil spacing for zero initial tension.

Applications for extension springs include automotive interiors and exteriors, garage door assemblies, vise-grip pliers, carburettors and butterfly valves, trampolines, washing devices, farm machinery, toys, as well as thousands of other uses. Extension springs come in a wide array of sizes to suit everything from small medical devices to off-road machinery brake springs.

The complete Lee Spring extension spring package includes loop ends in cost-effective music wire or corrosion-resistant stainless steel.  Speciality ordering available for hook ends, extended eyes or swivel bolt fixings.

Lee Spring also offers enhanced extension performance in their Drawbar design which uses a compression spring to provide a solid stop and safety retention. The Drawbar design also enables higher loadings than are usually possible in a normal extension spring design.

Extension springs are attached at both ends to other components so that when these components move apart, the spring tries to bring them together again. Extension springs absorb and store energy as well as create a resistance to a pulling force. It is initial tension that determines how tightly together an extension spring is coiled. This initial tension can be manipulated to achieve the load requirements of a particular application. Extension Springs are wound to oppose extension - they are often tightly wound in the no-load position and have hooks, eyes, or other interface geometry at the ends to attach to the components they connect. They are frequently used to provide return force to components that extend in the actuated position.