Grounding of stirrer bushing in a microwave oven

Details Grounding of stirrer bushing in a microwave oven Grounding of stirrer bushing in a microwave oven

1987-09-23

1988-08-16

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055D, H05B 674

Patent

active

047646519

ABSTRACT:
In a microwave oven, a stirrer bushing is used to rotatably mount a shaft of a stirrer paddle through a wall forming a portion of a waveguide duct so that the stirrer paddle may be rotatated within the waveguide duct. The stirrer bushing has an externally threaded stem portion adapted to be threadedly inserted into a stirrer nut clinched in the top wall of the portion of the waveguide duct located above a cooking cavity of the microwave oven. During the staking of the stirrer nut in the top wall, raised ridges or serrations are formed which project from the top wall into the waveguide duct. A head portion of the stirrer bushing has its underside surface provided with serrations projecting toward the stem portion of the stirrer bushing. As the stirrer bushing is installed into the stirrer nut, the serrations on the head of the stirrer bushing abrade against the raised ridges formed in the top wall. As a result, the paint covering the top wall is scraped away and the stirrer bushing becomes effectively shorted to the grounded wall of the waveguide duct to prevent leakage of electromagnetic energy from the waveguide duct.

REFERENCES:
patent: 3127494 (1964-03-01), Kellough et al.
patent: 3526737 (1970-09-01), Black
patent: 4296297 (1981-10-01), Miller
patent: 4429204 (1984-01-01), McGuire et al.
patent: 4458126 (1984-07-01), Dills et al.
patent: 4618756 (1986-10-01), Schwaderer et al.
patent: 4641006 (1987-02-01), Ross et al.

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