Electric heating – Heating devices – With heating unit structure
Patent
1974-12-05
1976-07-20
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
With heating unit structure
21102R, 219432, 219528, 219535, 338218, H05B 302
Patent
active
039708233
ABSTRACT:
An electric heater having a ceramic core with a heating element surrounding the core and a jacket surrounding the heating element such that the heating element is secured to the jacket but there is no chemical bonding between the heating element and the core. In the method of producing the electric heater, the core is formed in an uncured state and then surrounded with the heating element. The heating element is surrounded by a jacket such that the heating element is secured to the jacket, and the core is thereafter cured.
In producing an article such as the core of the heater from a thermosetting type material, the material is preheated to within a range so as to soften the material sufficiently for injection into a mold. The mold is preheated to a temperature sufficient to cure the material after injection into the mold. The material is then injected into the mold and the injection pressure thereafter released while keeping the mold clamped together for a time after release of the injection pressure, and thereafter the mold is unclamped and the article is removed from the mold.
REFERENCES:
patent: 1817027 (1931-08-01), Anderson
patent: 1881881 (1932-10-01), Noble
patent: 1992593 (1935-02-01), Whitney
patent: 2473402 (1949-06-01), Wood
patent: 2766367 (1956-10-01), Chaustowich
patent: 3304408 (1967-02-01), Finch et al.
patent: 3393297 (1968-07-01), Hart
patent: 3436171 (1969-04-01), Weichselbaum
patent: 3602692 (1971-08-01), Morey
patent: 3806701 (1974-04-01), Scott
Beta Corporation of St. Louis
Mayewsky Volodymyr Y.
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