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

1985-12-30

1988-01-19

Spruill, Robert L.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

72145, 72371, 140 89, B21F 3500

Patent

active

047196831

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 (1950-01-01), De Vries et al.
patent: 3342052 (1967-09-01), Boy
patent: 4424624 (1984-01-01), Sievers

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