Torsjonsfjær

Torsjonsfjær, also known as torsion springs, are a type of mechanical spring that stores rotational energy when acted upon by a torque. Unlike tension or compression springs which elongate or compress along their axis, torsion springs exert a force when twisted around their axis. They are typically made from a coiled wire, with ends that are designed to be attached to other components. The coils can be wound tightly or loosely depending on the application and desired spring rate. The direction of the coil winding can also be important, as it determines whether the spring unwinds or winds tighter when torque is applied.

Torsion springs are commonly found in various mechanical devices. Examples include clothespins, where the spring provides the clamping force to hold clothes onto a line, and garage doors, where they counterbalance the weight of the door, making it easier to open and close. They are also used in mousetraps, door hinges, and various industrial machinery. The design of a torsion spring involves calculating the wire diameter, coil diameter, number of active coils, and free length to achieve the required torque and deflection. The material used for torsion springs is usually spring steel, chosen for its ability to withstand repeated stress cycles without permanent deformation.