Electric heating – Metal heating – Of cylinders
Patent
1978-01-04
1980-05-27
Reynolds, B. A.
Electric heating
Metal heating
Of cylinders
219 1077, 156273, 331186, 331177R, 318650, 323 45, H05B 904, B29C 2704, C09J 506
Patent
active
042052106
ABSTRACT:
An apparatus for applying pressure and a high frequency electric field to material, comprising a cavity for containing the electric field which encloses platens relatively movable to apply pressure to material placed between the platens. The cavity electrically communicates with the platens for supplying the contained electric field to the platens which, in turn, cooperate with each other to apply the field to the material between the platens. The cavity and the platens are also directly coupled into the means for generating the electric field as a resonant circuit. The apparatus includes a triode tube having means for preventing excessive current therethrough as voltage is first applied, and means for operating the triode under optimum conditions utilizing an automatically variable capacitor to maintain a predetermined grid current for a workpiece placed within the apparatus after full voltage has been applied.
REFERENCES:
patent: 2401991 (1946-06-01), Walton et al.
patent: 2470443 (1949-05-01), Mittelmann
patent: 2504955 (1950-04-01), Atwood
patent: 2517948 (1950-08-01), Warren
patent: 2593959 (1952-04-01), Anderson et al.
patent: 2623176 (1952-12-01), Witsenburg et al.
patent: 2747646 (1956-05-01), Lippman
patent: 2810793 (1957-10-01), Bruene
patent: 3742180 (1973-06-01), Bradley
patent: 3845269 (1974-10-01), Bradley
Langton Frederick H.
Salway-Waller Malcolm
Halgren Donald N.
Leung Philip H.
Megley Richard B.
Reynolds B. A.
USM Corporation
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