Electrical resistors – Incased – embedded – or housed – With gaseous or vacuum spacing between element and casing or...
Patent
1976-02-17
1977-08-09
Albritton, C. L.
Electrical resistors
Incased, embedded, or housed
With gaseous or vacuum spacing between element and casing or...
219353, 219355, 219357, 219553, 338268, 338270, 338302, 338316, H01C 1024
Patent
active
040414388
ABSTRACT:
This electric heating device comprises a support surrounded by a resistance wire and located within a vacuum outer tube, said resistance being spaced from the inner surface of the outer tube. In order properly to position the support and resistance wire on the center axis of the tube, a mounting assembly is provided at each end of the support. Said mounting assembly comprises a resilient cap-shaped centering member having an annular ring portion surrounding the support, clips limiting the engagement of said cap-shaped member onto said support, and outwardly extending resilient arms engaging the inner surface of the outer tube in order to center the support and resistance wire within said outer tube. A supply lead is connected between said resistance wire and an output/input conductor. Said supply lead comprises a longitudinal portion extending along the support and a radial portion connected to said conductor within a supporting glass case or bead projecting into the outer tube from its end. A retaining wire diametrically opposite to said supply lead comprises a radial portion and a longitudinal portion extending along said support and terminating in a beak-like end engaged into a recess of the support, for retaining said support in the longitudinal direction. The two mentioned radial portions are flexible for compensating the differential thermal expansion.
REFERENCES:
patent: 2559943 (1951-07-01), Ceruy
patent: 2757310 (1956-07-01), Robinson et al.
patent: 2894166 (1959-07-01), Mohn
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