Ranoson machines manufactures and offers torsion springs that offer resistance to externally applied torque. These springs have ends that are rotated in angular deflection. The wire itself is subjected to bending stresses rather that torsional stresses, as might be expected from the name. Springs of this type are usually close wound, reduced coil diameter, and increase in body length as they are deflected. Special types of torsion springs include double torsion springs and springs having a space between the coils to minimize friction. Double torsion springs consist of one right-hand and one left-hand coil section connected together, and working in parallel. The sections are designed separately with the total torque exerted being the sum of the two.
