Torsion Spring

A torsion spring is a spring that works by twisting its end along its axis; that is, a flexible elastic object that stores mechanical energy when it is twisted. When it is twisted, it exerts a torque in the opposite direction, proportional to the amount it is twisted.

The legs of the torsion springs are attached to separate components, with the flexibility of the wound material providing opposite angular torque around the spring's axis. This force can hold parts in place or store and release the mechanical energy on cue. A higher potential energy results in a tighter, leaner spring.