Method of manufacturing coiled heating element

Details Method of manufacturing coiled heating element Method of manufacturing coiled heating element

1988-07-25

1991-01-29

Rosenbaum, Mark

Metal working

Method of mechanical manufacture

Electrical device making

29616, 29446, 219546, 219552, 219553, 338296, 338333, H01C 103

Patent

active

049876759

ABSTRACT:
A coiled heating element is manufactured by providing a coiled element of bare resistance wire in which the coil pitch is not greater than twice the cross-sectional dimension of the wire. The element is stretched by an amount permitting recovery to its original configuration and an electrically insulating particulate material is applied to the stretched element. The stretched element is then allowed to return towards its original configuration thus trapping particulate material between adjacent coils of the element and the element is heated so as to oxidize the surface of the wire.

REFERENCES:
patent: 1433691 (1922-10-01), Woodson
patent: 1793829 (1931-02-01), Richardson et al.
patent: 1997844 (1935-04-01), Wiegand
patent: 2375058 (1945-05-01), Weigand
patent: 2577080 (1951-12-01), Glenn
patent: 2853765 (1958-09-01), Wemhoener
patent: 3622935 (1970-06-01), Oakley

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