Torsion springs

Torsion spring is a type of spring that operates by twisting its ends along its axis. It is a flexible
elastic object that stores mechanical energy when it is subjected to torsion or twisting forces. As
the spring is twisted, it generates a torque in the opposite direction, which is directly proportional to
the amount (angle) of twist applied. There are several different types of torsion springs, each
designed for specific applications.
Spring brakes