A tension spring is, as its name suggests, intended to undergo deformation by tensile force. Thanks to the shape memory of its specific material, it can restore this energy to return to its original position. The tension spring often has a loop at its ends. They allow it to be extended during a traction and then to return to its position at the time of release. Helical in shape, the tension spring is according to use when it grows and in rest function when it shrinks.
Intended to be extended, the tension spring is most of the time manufactured with the coils attached. This gives him the opportunity to stretch without difficulty. In terms of manufacturing, the tension spring can be directly pulled out to the machine when the ends are made of German loops. For English loops, the spring is machine-wound but the loops are handmade. The German and English rings are the most important ends commonly used for tension springs.
The tension spring is used in two ways, either in constant tension or in repeated tension. Then, the force used to extend the tension spring is either applied to both ends at the same time or to only one. In this second case, either the second end is just hung or it is directly fixed.
Several uses for the tension spring, especially for :
It can be seen that there can be a multitude of uses for the tension spring, however they are not all stated. Indeed, the use of the spring depends on the environment in which it works and also on its function. As a manufacturer of custom springs it is possible to adapt to all constraints for its use.
To understand how the tension spring works, you have to imagine an invisible axis around which the material is wound. The spring is manufactured in such a way that each side of the turn is equidistant from the axis. The tension spring can exert a perfectly straight stroke towards the outside while remaining in a straight axis. It can also be slightly twisted (maximum 15 % tolerable).
|Bore||The tension spring operates in a bore if the size of the bore is larger than the outer diameter of the spring.|
The minimum height of the tension spring is reached when the turns are all joined. At the moment of rest when no force is applied.
The maximum height is reached when the spring is in operation. It is maximum when the height of the yarn is equal to the height of the spring. However, the tension must remain normal so as not to damage the spring.
Different types of ends :