Electric heating – Heating devices – With current connection and/or disconnection means
Patent
1985-07-26
1987-06-09
Leung, Philip H.
Electric heating
Heating devices
With current connection and/or disconnection means
219 1055B, 219 1055R, 99325, 99DIG14, 177245, H05B 668
Patent
active
046721819
ABSTRACT:
A heating apparatus comprises a housing having a chamber and a door for closing the chamber, and a power supply source to supply heating energy to the chamber. A door-close sensor is provided for detecting when the door is closed. A foodstuff is placed on a table which is vertically movably mounted in the chamber on a resilient support so that the table may oscillate at a frequency determined by the weight of the foodstuff. The housing may be constructed to transmit an impact to the table at the instant the door is closed, or alternatively, means are provided for causing the table to oscillate at the frequency in response to the door being closed. The oscillation of the table is converted to an electrical signal and analyzed to determine the weight of the foodstuff. The power supply source is controlled in accordance with the determined weight.
REFERENCES:
patent: 3725656 (1973-04-01), Fukuma
patent: 4190756 (1980-02-01), Foerstner
patent: 4232210 (1980-11-01), Oida et al.
patent: 4255639 (1981-03-01), Kawabata et al.
patent: 4390768 (1983-06-01), Teich et al.
patent: 4413168 (1983-11-01), Teich
patent: 4539453 (1985-09-01), Miyazaki et al.
Mihara Makoto
Sakamoto Kazuho
Leung Philip H.
Matsushita Electric - Industrial Co., Ltd.
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