Method and apparatus for forming a barrel coil spring

Details Method and apparatus for forming a barrel coil spring Method and apparatus for forming a barrel coil spring

1988-07-26

1990-08-07

Combs, E. Michael

Metal deforming

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

To form helical coil or tube

72139, 72371, B21F 310, B21F 3502

Patent

active

049457446

ABSTRACT:
A method and apparatus are disclosed for forming a barrel coil spring. The apparatus according to the invention has a rotatable head, and clamping device to attach an end of the coil spring to the rotatable head, a forming die head with at least one forming die which may be inserted between adjacent coils of the spring near the second end such that a forming die bears against an inner surface of a coil, a first rotating device to rotate the head in a first direction about an axis substantially parallel to a longitudinal axis of the coil spring, and a second rotating device to rotate the forming die head in a second direction, opposite to that of the first direction, about an axis substantially parallel to the longitudinal axis of the coil spring. The method according to the invention has the steps of attaching an end of the coil spring to a rotatable head, inserting at least one forming die between adjacent coils so as to bear against an inner surface of a coil, rotating the rotatable head in a first direction about a first axis substantially parallel to a longitudinal axis of the coil spring, and rotating the at least one forming die in a second direction, opposite to that of the first direction, about an axis substantially parallel to the longitudinal axis of the coil spring.

REFERENCES:
patent: 1676598 (1928-07-01), Bleuel
patent: 2335423 (1943-11-01), Knoop
patent: 4424695 (1984-01-01), Kirchoff et al.
patent: 4571973 (1986-02-01), Morita
patent: 4682394 (1987-07-01), Wells
patent: 4719683 (1988-01-01), Ulbing

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