Preloaded spring, method and apparatus for forming same

Details Preloaded spring, method and apparatus for forming same Preloaded spring, method and apparatus for forming same

1988-01-11

1989-06-06

Halvosa, George E. A.

Spring devices

Coil

Conical

29173, 72145, 140 89, F16F 106

Patent

active

048365149

ABSTRACT:
A closely wound, coil type tension spring of one hand having an initial tension exceeding that obtainable by prior spring forming techniques is formed by reverse winding an open-wound compression spring of the opposite hand. Alternative methods and apparatus for forming the tension spring are disclosed.

REFERENCES:
patent: 1676598 (1928-07-01), Bleuel
patent: 2248440 (1941-07-01), Schmid
patent: 2495212 (1960-01-01), De Vries et al.
patent: 3342052 (1967-09-01), Boy
patent: 4424624 (1984-01-01), Sievers

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