Circulation fan for baking ovens

Details Circulation fan for baking ovens Circulation fan for baking ovens

1989-06-19

1990-11-27

Walberg, Teresa J.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

126 21A, F27D 704

Patent

active

049738259

ABSTRACT:
A circulation fan for circulating air in the baking muffle of an oven in which a conductive connection is made between the drive shaft and the back wall of the baking muffle whereby the RF energy passing outward over the surface of the drive shaft is short-circuited via the back wall of the baking muffle. The conductive connection is in the form of a spring element, e.g. a clamping member or a disk spring, whereby manufacturing and operational variations are compensated for. If the portion of the drive shaft located outside the baking muffle is roughened and/or covered with an electrically poorly conducting coating, further damping of the escaping RF energy is obtained.

REFERENCES:
patent: 4053730 (1977-10-01), Baron
patent: 4211909 (1980-07-01), Yoshida
patent: 4303817 (1981-12-01), Klement
patent: 4308417 (1981-12-01), Martin
patent: 4335290 (1982-06-01), Teich
patent: 4358653 (1982-11-01), Weiss
patent: 4485285 (1984-11-01), Machesney
patent: 4687908 (1987-08-01), Thorne
patent: 4764651 (1988-08-01), Schwartz

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