Method of making compact electric coils

Details Method of making compact electric coils Method of making compact electric coils

1975-06-09

1977-09-20

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

29605, 72342, 72364, H01F 4104, H04R 3100

Patent

active

040487130

ABSTRACT:
A method of producing a compact electric coil such as a voice coil for loudspeakers, whereby a coil member is wound of ordinary round wire having a coating of a thermoplastic or thermosetting bonding material, whereafter the coil member mounted on a mandrel is heated together with the mandrel and thereafter cooled from its outside so as to crimp around the mandrel while this is still warm and expanded. Hereby the round wire will be forced inwardly with high force so as to get cross sectionally deformed to fill out the available space to a very large degree, and the bonding material sets so as to hold the coil in its compacted shape whereby a coil of high rigidity and heat conductivity is produced. The coil is easily retractable from the mandrel upon further cooling of the latter.

REFERENCES:
patent: 1041293 (1912-10-01), Keller
patent: 3050613 (1962-08-01), Sheinhartz et al.
patent: 3298096 (1967-01-01), Stuart
patent: 3348183 (1967-10-01), Hodges et al.
patent: 3383900 (1968-05-01), Hartesveldt
patent: 3541682 (1970-11-01), Hildebrandt
patent: 3667118 (1972-06-01), Camardella
patent: 3845547 (1974-11-01), Reynolds

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