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Biconical spring, characterized by the fact of consisting of two parts, equal and opposite, of groups of turns so that the radii of the same will decrease progressively and proportionally, in one direction or the other and towards the ends, the radius being greater in the center and the minors in both ends, with whose structure and when performing a tensile stress at both ends or in a single one, an equal and opposite value of reaction will be obtained, but which is inversely proportional to the radius of the turn, obtaining a combination of central elasticity and strength at the ends required for small spaces where both effects are required. (Machine-translation by Google Translate, not legally binding)