Weighing scales – Structural installation – Furniture or room fixture
Patent
1993-04-16
1994-09-20
Miller, Jr., George H.
Weighing scales
Structural installation
Furniture or room fixture
177210C, 177245, G01G 1952, G01G 314
Patent
active
053491386
ABSTRACT:
A food weight sensing device for a microwave oven, which comprises a fixed electrode plate and a movable electrode plate which vary in overlapping area, according to a vertical movement of a movable spacer caused by the weight of a food to be measured. A capacitance signal indicative of the variation in overlapping area is converted into a frequency signal, so as to sense precisely the weight of food. The device comprises a fixed spacer, a movable spacer being movable with respect to the fixed spacer, a pair of plate springs disposed between the spacers, a weight sensing fixed member fixedly mounted beneath a base plate of the microwave oven and having a vertically extending actuating chamber opened at one end thereof, a fixed electrode disposed in the actuating chamber and having a fixed electrode plate being attached to an inner surface of the weight sensing fixed member defining the actuating chamber, and a movable electrode fixedly mounted at its lower portion to the movable spacer and having a movable electrode plate being vertically movable through the actuating chamber while maintaining a parallel state with the fixed electrode plate.
REFERENCES:
patent: 4676328 (1987-06-01), Morino
patent: 4825967 (1989-05-01), Sakamoto et al.
patent: 4899600 (1990-02-01), Lee
patent: 4970374 (1990-11-01), Ueda et al.
Goldstar Co. Ltd.
Miller Jr. George H.
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