torsionspring

A torsion spring is a type of elastic device that stores rotational energy. It works by exerting a torque, or twisting force, in response to an applied torque. Unlike a compression or extension spring which store energy by being compressed or stretched, a torsion spring stores energy when its ends are rotated around the spring's axis.

Torsion springs are typically made from a single strand of spring wire wound into a helical coil. The ends of the coil are designed to extend radially outward and are usually shaped to provide a point of attachment. These extensions, often called arms or legs, can be straight, offset, or angled to suit various applications. When the arms are rotated relative to each other, the coils of the spring are either wound tighter or unwound, creating a resistance that generates the restoring torque.

The main function of a torsion spring is to apply a rotational force or to control rotational movement. They are used in a wide variety of everyday items and industrial applications. Examples include clothespins, where the torsion spring provides the clamping force, and garage doors, where they are used in pairs to counterbalance the weight of the door and assist in lifting and lowering it. Other common uses are found in mousetraps, clipboards, and automotive suspension systems. The design and material of a torsion spring are critical to its performance, influencing its torque output, fatigue life, and resistance to environmental factors.