Automatic spring machine( cam less). A double torsion spring, also known as a twisted torsion spring or a double-coil torsion spring, is a type of spring that consists of two coil sections connected by a center section. This design provides the spring with double the amount of torque compared to a single torsion spring.
They are particularly suitable for applications that require a balance between torque and angular deflection. The two coil sections of the spring provide equal and opposite torques, which results in a balanced and stable operation.
