Electric heating – Microwave heating – Radiation protection
Patent
1993-06-18
1995-04-11
Leung, Philip H.
Electric heating
Microwave heating
Radiation protection
219739, 174 35MS, 126198, H05B 676
Patent
active
054060575
ABSTRACT:
A door of a microwave oven comprises a metal sheet having a window in a central portion thereof, and a support plate and a transparent glass plate. The metal sheet has a flange formed by press molding, which surrounds the central portion of the metal sheet. The window comprises at least two kinds of hole. A diameter of a first hole is larger than that of a second hole. The first holes are located in the center of the window. The second holes are located each side of an area of the first holes. To manufacture the metal sheet construction, a punch having first pins and second pins, punches simultaneously a row of the first holes and the second holes in a piece of metal sheet. Next, the metal sheet is relatively moved to the punch. The punch punches a next row of the first holes and the second holes. The punching and being moved process are alternatively repeated until the window is made. Finally, the metal sheet is press molded.
REFERENCES:
patent: 3431348 (1969-03-01), Nellis et al.
patent: 3711673 (1973-01-01), Takeda et al.
patent: 4051341 (1977-09-01), Tanaka et al.
Patent Abstracts of Japan, vol. 10, No. 18 (M-448)(2075) 24 Jan. 1986 & JP-A-60 178 225 (Sanyo Denki KK) 12 Sep. 1985 *abstract*.
Hosono Yukihito
Komatsu Morimasa
Kabushiki Kaisha Toshiba
Leung Philip H.
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