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Torsion
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 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. |