Lee offers Constant Force Springs in four Life Cycle ranges. Each spring is a roll of high yield Type 301 Stainless Steel strip exerting a nearly constant restraining force to resist uncoiling. When the strip is extended, the inherent stress resists the loading force at a nearly constant rate.

Guide to Mounting Constant Force Springs
A Contant 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.

• The drum diameter should be 10 to 20% larger than its natural diameter.
• One and one-half wraps should remain on the drum at maximum extension.
• The strip becomes unstable at long extensions and should be guided to
  prevent twisting or kinking on recoil.
• 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.

2500 Life Cycle	4000 Life Cycle
13000 Life Cycle	25000 Life Cycle

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