Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1989-07-25
1990-05-15
Miller, Jr., George H.
Weighing scales
Self-positioning
Electrical current generating or modifying
177164, G01G 314, G01G 2314
Patent
active
049249550
ABSTRACT:
Electronic weighing device adapted particularly to be mounted in a personal weighing scale and comprising a capacitative collector (C1) forming a measuring condenser whose capacity varies as a function of the weight to be measured and which has for this purpose a first electrode (10) connected mechanically to a weighing platform (12) and a second electrode (14) mounted fixedly in the casing. The measuring condenser is connected to a measuring circuit, which comprises: a reference condenser (C0) mounted in series with the measuring condenser (C1), each of these condensers having an electrode (14, 16) connected to a terminal (18) common to the two condensers and an electrode (20, 10) connected to an external non-common terminal (22, 24). A zero-voltage detector device (26) has an input (28) connected to the common terminal (18) by a third entry condenser (C2), and an output (30) connected to the input (32) of a signal treatment device (34) whose first output (36) is connected to the input ( 38) of a display device (40) of the weighing results. Two electronic switches (42, 44) comprise a reference one (42) connected to the external terminal (22) of the reference condenser (C0) and the other one (44) connected on the one hand to a second output (46) of the signal treatment device (44) and on the other hand to the external terminal (24) of the measuring condenser (C1).
REFERENCES:
patent: 3000101 (1961-09-01), Giardino et al.
patent: 4372405 (1983-02-01), Stuart
patent: 4461363 (1984-07-01), Loy
patent: 4572006 (1986-02-01), Wolfendale
Miller Jr. George H.
Moulinex (Societe Anonyme)
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