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Constant Force Springs – Most basic & versatile springs at counterbalance application
Feature
❑ SMS Spring offers Constant Force Springs in four Life Cycle ranges: 2500, 4000, 13000 and 25000. Each spring is a roll of high yield Type 301 Stainless Steel strip exerting a nearly constant restraining force to resist uncoiling. We can also provide Custom Constant Force Springs, made to your specification.
❑ A Constant Force Spring is usually mounted by first tightly wrapping it on a drum, then attaching the free end to the loading force such as in a counterbalance application. This relationship can also be reversed.
Programing
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The drum diameter should be 10% to 20% larger than its natural inside diameter. One and one-half wraps should remain on the drum at maximum extension.
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The strip becomes unstable at long extensions and should be guided to prevent twisting or kinking on recoil.
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Idler pulleys must be larger in diameter than the natural diameter and should never be used to cause back-bending against the natural radius of curvature.
Applications
❑ The constant force spring is an excellent device for applications where a constant load is required. Some of the many applications of constant force springs are in counterbalances, door closers, cable retractors, hose retrievers, tool head returns, cabinet furniture components, gym equipment, hair dryers, toys, electric motors, appliances, space vehicles, and other long-motion functions.
❑ Motor springs are used for cable retraction, power generation etc. Power springs are used for retracting applications such as seat belt webbing, tape measures and dog leads, seat recliner, window regulator mechanisms etc.