Method for making a spiral coil having spaced turns

Details Method for making a spiral coil having spaced turns Method for making a spiral coil having spaced turns

1976-06-03

1978-07-25

Combs, E. M.

Metal deforming

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

To form spiral coil

B21C 4704

Patent

active

041021703

ABSTRACT:
A method for winding a spiral coil involving the steps of winding a metal band on a mandrel in advance of the mandrel continuously forming a succession of regularly-spaced deformations in the band edges which protrude alternately from the opposite band surfaces to space the coil turns. During the winding, and for each successive turn, the sequence of deformations is shifted along the band, in one direction or the opposite, by a predetermined dimension such that oppositely-protruding deformation on adjacent turns come into tangential locking engagement with each other at the start of every succeeding turn and all projections on each turn come into such locking engagement. Apparatus for performing the method is also disclosed.

REFERENCES:
patent: 2257760 (1941-10-01), Nyberg
patent: 2275458 (1942-03-01), Nyberg
patent: 3557592 (1971-01-01), Corns
patent: 3581389 (1971-06-01), Mori et al.
patent: 3966646 (1976-06-01), Noakes et al.

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