Torsion springs are commonly used in clothes pins, clipboards, hinges, counterbalances and lever return applications. Electronic devices, to large torsion used in chair control units. Torsion springs perform best when supported by a rod or tube. The designer should consider the effects or friction and arm deflection on the torque.
The different types of torsion springs are double torsion, short hook ends, hinge ends, straight offset, straight torsion and special ends etc.