Manufacture of tension springs
Loop springs
Tension springs are helical springs which oppose an axial force the elongation of the spring. They are shortest when at their free length. Very often, the coils of tension springs are joined at rest. To exert a force on a tension spring, its ends are fitted with eyelets or hooks. In addition to cylindrical tension springs, conical hourglass-shaped or convex barrel-shaped tension springs are also manufactured.
Spring applications
German and English loops
Tension springs are generally fitted with loops or hooks, the choice of which depends on space constraints and fixing requirements. There are two main categories of ends: German loops (single or double, with the start on one side) and English loops (centred in the axis of the spring). CGR can help you choose the most suitable fastening method.
Tension spring specifications
Spring preload
The preload of a tension spring is the initial tension inside the spring when it is at rest, i.e. unstretched. Unlike a compression spring, which begins to act as soon as it is crushed, a tension spring requires a certain minimum force to be applied before it begins to stretch. Pre-tensioning eliminates mechanical play between the spring and the mechanical parts, improves the precision of the system, and increases its durability and resistance to premature fatigue.
CGR relies on its STRAIN advanced research laboratory to develop specific technical solutions for the complex problems of dimensioning and manufacturing tension springs.
