The multiple and general-purpose functions of a helicoid are used to produce powerful springs of precision, accumulators of energy of the couplings...
The components upstream/downstream directly bordering are integrated to obtain a connection compact, cast solid, made safe.
The force of recall is restored with a constant value in compression, extension, torsion, in translation, alternatively but also simultaneously.
No the buckling of load, the whorls are reversed to avoid rotation in compression.
3 departures of whorls give more rigidity, improve the repeatability, safety. Even with a broken whorl, spring HELICAL remains operational.