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11 constant force springs ametek spring metal coils
11 Constant force springs AMETEK Spring Metal Coils
Offered here are 11 constant force springs : (4) 3/4" wide 1-3/6" diameter and (7) 9/16" wide 3/4" diameter.
From the AMETEK Hunter Products website:
Constant-force spring AMETEK Hunter Products
The NEG'ATOR extension spring represents the most basic, yet most versatile, type of constant force springs. It is a prestressed flat strip of spring material which is formed into virtually constant radius coils around itself or on a drum. When deflected, the spring material straightens as it leaves the drum. This straightened length of spring actually stores the spring's energy through it's tendency to assume its natural radius.
The full rated load of the spring is reached after being deflected to a length equal to 1.25 times its diameter. Thereafter, it maintains a relatively constant force regardless of extension length. Load is basically determined by the thickness and width of the material and the diameter of the coil.
