Method and apparatus for making double-coned coil springs

Details Method and apparatus for making double-coned coil springs Method and apparatus for making double-coned coil springs

1988-12-06

1990-11-06

Combs, E. Michael

Metal deforming

By deflecting successively-presented portions of work during...

To form helical coil or tube

72139, B21F 310, B21F 3502

Patent

active

049675800

ABSTRACT:
Disclosed is a method and device for making a double-coned coil spring, which comprises using a semi-finished spring having formed upon one end thereof a first conically wound portion with the rest of the wound portion extending axially with a constant maximum diameter, and forming a second conically wound portion upon the free end of the cylindrically wound portion; wherein the cylindrically wound portion is clamped at the site from which formation of the second conically wound portion is to be started by means of a first clamping means, and the open end of the cylindrically wound portion is also clamped by means of a second clamping means; and the second clamping means is allowed to rotate in the direction of winding the semi-finished spring, while the second clamping means is forced to be moved radially inwardly toward the center of the semi-finished spring.

REFERENCES:
patent: 2456755 (1948-12-01), Terrell
patent: 4424695 (1984-01-01), Kirchhoff et al.
patent: 4571973 (1986-02-01), Morita
patent: 4719683 (1988-01-01), Ulbing

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