Electric heating – Metal heating – Of cylinders
Patent
1988-12-01
1990-02-06
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1071, 219 1079, H05B 608
Patent
active
048990256
ABSTRACT:
An inductive heating apparatus includes two or more inductors (2, 3) connected to a single high-frequency generator (1). With such a heating apparatus, for example, the two supports (9, 10) in a cathode ray tube can be heated simultaneously. In order to have the heating of each support proceed properly, the heating operations of the individual supports (9, 10) should be effected independently. Independent interruption of the electromagnetic power transfer from the inductors (2, 3) to the supports (9, 10) is preferably effected by axially moving away from the workpiece (4) a coil core (6, 8) inside the associated induction coil (5, 7). This is advantageous in that the case of low-ohmic inductors no large currents and in the case of high-ohmic inductors no large voltages need to be switched. In addition, the induction coils, which in the case of low-ohmic inductors (2, 3) often consist of an internally cooled tubular conductor, can then be rigidly mounted.
REFERENCES:
patent: 2714648 (1955-08-01), Blok et al.
patent: 2773161 (1956-12-01), Baker
patent: 2856499 (1958-10-01), Stanton et al.
patent: 3109909 (1963-11-01), McBrien
patent: 3573416 (1971-04-01), Drechsler
patent: 4327265 (1982-04-01), Edinger et al.
patent: 4425489 (1984-01-01), Pav et al.
patent: 4506131 (1985-03-01), Boehm et al.
De Meij Johannes P.
Kamp Ronald P. T.
Franzblau Bernard
Leung Philip H.
U.S. Philips Corporation
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