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TORSION
SPRINGS
Torsion springs, whose ends are rotated in angular deflection offer
resistance to externally applied
torque. The wire itself is subjected to bending stresses rather than torsional
stresses, as might be
expected from the name. Springs of this type are usually close wound, reduce in
coil diameter, and increase in body length as they are deflected. The designer
must consider the effects of friction and arm deflection on the torque Special
types of torsion springs include: double
torsion springs and springs having a space between the coils to minimise the
friction. Double torsion springs consist of one right-hand and one left-hand
coil section connected together and working in parallel.