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Constant Force Springs

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About Constant Force Springs

Constant force springs are a special variety of extension spring.  They are tightly coiled wound bands of pre-hardened spring steel or stainless steel strip with built-in curvature so that each turn of the strip wraps tightly on its inner neighbor. When the strip is extended (deflected) the inherent stress resists the loading force, the same as a common extension spring, but at a nearly constant (zero) rate.  The constant-force spring is well suited to long extensions with no load build-up. In use, the spring is usually mounted with the ID tightly wrapped on a drum and the free end attached to the loading force, such as in a counterbalance application. This relationship can be reversed, however, with the free end mounted stationary and the spring itself providing the working force, as with carbon brushes in electrical apparatus.  Considerable flexibility is possible with constant-force springs because the load capacity can be multiplied by using two or more strips in tandem, or back-to-back.  Constant force springs are available in a wide variety of sizes.

Common materials of construction for constant force springs include 301 stainless steel, high carbon steel, and Inconel®.  Type 301 is an austenitic chromium-nickel stainless steel capable of attaining high tensile strength and ductility by cold working. It is not hardenable by heat treatment. Type 301 is essentially nonmagnetic in the annealed condition and becomes magnetic with cold deformation.  High carbon steel is steel with more than 0.3% carbon. The more carbon that is dissolved in the iron, the less formable and the tougher the steel becomes. High-carbon steel's hardness makes it suitable for bedsprings, cutting edges, or other high-wear applications.  Inconel is an alloy of nickel-chromium.  It is a lightweight metal used for extreme durability, performance, and heat-resistance.  Inconel is a registered trademark of Special Metals Corporation.

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Engineering Web: Constant Force Springs

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Constant Force & Power Springs - Bazz Houston Co.
Constant Force Springs Conforce precision springs offer high force output with very small space
See Bazz Houston Company Information
Force - Wikipedia, the free encyclopedia

Constant Force Springs Manufacturers On B2BChinaSources.Com...
Also see : - Constant Force Springs - Constant Force Springs - Constant Force Springs
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Part Numbers for Constant Force Springs

Part # Distributor Manufacturer Product Category Description
GCF-04-30 Amazon Gardner Spring Industrial & Scientific Gardner Spring GCF-04-30 0.010 X 34 X 0.680 Constant Force Springs
CF022-0112 Amazon Reid Supply Company Industrial & Scientific .006 x .37 (A x B), Load - 1.12 lbs., 4,000 Cycle Fatigue Life, Stainless Steel, Constant-Force Spring (1 Each)
CFS-075 Amazon ASSOCIATED SPRING RAYMOND Industrial & Scientific Stainless Steel 301 Constant Force Spring, 0.005" Thick, 0.42" ID, 0.75 Lb. Load
CFS-112 Amazon ASSOCIATED SPRING RAYMOND Industrial & Scientific Stainless Steel 301 Constant Force Spring, 0.006" Thick, 0.51" ID, 1.12 Lb. Load
GCF-04-05 Amazon Gardner Spring Industrial & Scientific Gardner Spring GCF-04-05 0.004 X 15 X 0.250 Constant Force Springs

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