Double Torsion Springs are helical springs that exert torque or rotary force.
Double Torsion Springs are manufactured around a center point with two sets of coils wound in opposite directions and bridged in the middle in order to create a single spring. These springs have the capability to deliver load or torque twice that of a single torsion spring. Double Torsion Springs are generally mounted around a shaft or arbor, and must be supported at four or more points.
The legs can have virtually any type of bend, twist or loop, making mounting them very versatile in a variety of applications.
Double Torsion Springs are commonly seen in clipboards, counterbalance mechanisms, ratchets, and many other machine components.