CONSTANT FORCE SPRINGS/Constant Force Springs

Constant force rings are generally constructed as a pre-stressed flat strip material tightly wrapped around a drum or shaft in the centre. The hole in the free end is attached to a loading force like a counterbalance application. As the spool is unwound (deflected), it exerts a near-constant force because the coil's geometry remains nearly constant by the drum.

TSMC’s constant force springs offer several user benefits: include a constant load at a zero rate, a smooth range of motion, strong force yield within small spaces, too long linear extensions possible and store power indefinitely when extended... The constant force spring is an excellent design component for applications where a constant load is required.

Basically, the length, material thickness, width, the diameter of the coil and the natural radius curvature all contribute to extension resistance (affect the spring’s load). Additional flexibility in load can be increased by using multiple constant force springs with a spool, tandem, laminar, back to back, cavity, pulley mounting or in other configurations to suit the design situation. The spring's full rated load is reached after being deflected to the length extended to 1.25 times its diameter.

FEATURES

Roll back the force (zero gradients).

When stretched to a length of 1.25 times the outside diameter, a fixed force is achieved.

There is no friction between the coils (acting smoothly).