Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1998-11-30
2000-07-18
Gibson, Randy W.
Weighing scales
Self-positioning
Electrical current generating or modifying
177245, 219708, 219518, G01G 314, G01G 1900, H05B 102, H05B 650
Patent
active
060910291
ABSTRACT:
A weight sensing device for a microwave oven. The device has a fixing bracket having a bottom wall defined by a depress portion and a pair of protuberance portions which are provided at both ends of the depress portion and vertically ascending therefrom, and a pair of side walls which are integrally formed with side ends of the pair of protuberance portions and upwardly extending therefrom, a printed circuit board rested on the depress portion of the fixing bracket and provided at an upper surface thereof with a fixed electrode plate, an elastically movable electrode plate which is supported on the protuberance portions in a form of a fixed beam such that a predetermined gap is formed between the fixed electrode plate and the elastically movable electrode plate, a motor assembly which is mounted on an upper portion of the fixing bracket and is rotatably supporting a tray in which articles are placed, and a microcomputer determining the weight of articles based on the capacitance value. The motor assembly elastically descends the elastically movable electrode plate in proportional to a weight of articles, thereby varying a capacitance value. The device has a simple construction and can accurately measure the weight of the foodstuffs.
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patent: 4913248 (1990-04-01), Zakai
patent: 5349138 (1994-09-01), Dong
patent: 5672850 (1997-09-01), Liu
patent: 5712451 (1998-01-01), Lee
Daewoo Electronics Co. Ltd.
Gibson Randy W.
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