Hot Products
Constant Force Springs from China Suppliers – Versatile and Basic Solutions from Our Factory
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.
Programming
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.
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.
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.
Frequently Asked Questions
Q1
What is a Constant Force Spring and how does it work?
A Constant Force Spring is a roll of high-yield stainless steel strip that exerts a nearly constant restraining force throughout its range of motion. It resists uncoiling by storing mechanical energy, providing a consistent load regardless of extension length.
Q2
What life cycle ranges are available for Constant Force Springs?
SMS Spring offers Constant Force Springs in four life cycle ranges: 2500, 4000, 13000, and 25000 cycles. Custom specifications can also be manufactured to meet specific application requirements.
Q3
What material is used to manufacture Constant Force Springs?
Constant Force Springs are manufactured from high-yield Type 301 Stainless Steel strip. This material provides excellent strength, corrosion resistance, and the elastic properties necessary to maintain a consistent force output over repeated cycles.
Q4
How should the drum be sized for a Constant Force Spring installation?
The drum diameter should be 10% to 20% larger than the spring's natural inside diameter. Additionally, at least one and one-half wraps must remain on the drum at maximum extension to ensure proper performance and longevity.
Q5
What are the most common applications for Constant Force Springs?
Constant Force Springs are widely used in counterbalances, door closers, cable retractors, hose retrievers, tool head returns, gym equipment, hair dryers, electric motors, appliances, seat belts, tape measures, window regulators, and space vehicles, among many other long-motion applications.
Q6
Are there any installation precautions to keep in mind when using Constant Force Springs?
Yes. The spring strip can become unstable at long extensions and should be guided to prevent twisting or kinking during recoil. Idler pulleys must always be larger in diameter than the spring's natural diameter and should never cause back-bending against the spring's natural radius of curvature.