Constant force springs are constructed of a tightly wound roll of strip spring material, which has extra-strong spring properties. The material is coiled to a specified diameter that produces constant torque when it is deflected. Once deflected the material then returns to its coiled diameter. They offer long deflection, without significant change of force.
As a balancing mechanism, the constant force spring is more compact and lighter than most other methods. They eliminate deadweights, linkages, cylinders, and other systems. As a return or retracting mechanism, it will provide a smooth, even, uniform load through its entire length of travel (deflection). Constant tensioning or pressure is also an attribute. Constant force springs are an excellent solution for reducing device costs and eliminating expensive, complex motors.
At John Evans’ Sons we are the leading international constant force spring manufacturer. Excelling in designing and manufacturing springs for diverse applications, ensuring precision and reliability.
Many design factors will affect the time and cost needed to manufacture. Therefore, it’s important to work with a manufacturer like John Evans’ Sons that has the knowledge needed in the design phase.
Our strongest selling points are our custom design capabilities, in-house tooling services, manufacturing, a wide and varied stock spring selection, and our commitment to quality and on-time delivery.
