Vetojousi

Vetojousi is a Finnish term that translates to "tension spring" or "pull spring" in English. It refers to a type of mechanical spring designed to exert a pulling force when stretched. Unlike compression springs, which push back when compressed, vetojousi operates by resisting being pulled apart.

These springs are commonly found in a wide array of applications where a pulling or retractive action is required. Examples include simple retractable mechanisms like those found in retractable pens or tape measures, door closers that pull a door shut, and various industrial machinery where components need to be held under tension. They are also utilized in automotive components, agricultural equipment, and even in some types of toys and exercise devices.

The design of a vetojousi typically involves coils of wire, often made from steel alloys, wound tightly together. When the spring is extended beyond its resting length, the coils attempt to return to their original configuration, thereby generating the tensile force. The strength and range of motion of a vetojousi are determined by factors such as the wire's material, diameter, the number of coils, and the overall length of the spring. End hooks or loops are often incorporated to facilitate attachment to other components.