John Evans’ Sons is an international leader in constant force spring design and manufacturing.
Long deflection, without significant change of force, is a key characteristic of constant force springs. As a balancing mechanism, the spring is more compact and lighter than most other methods and can 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.
There are many design factors that will affect the time and cost needed to manufacture your constant force spring. 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, precision manufacturing, a wide and varied stock spring selection, and our commitment to quality and on-time delivery.
To help you in the product selection process, this page will discuss the design considerations of constant force springs, which include: