Weighing scales – Processes
Patent
1997-08-04
1999-03-23
Gibson, Randy W.
Weighing scales
Processes
177210C, 177212, 177208, G01G 900, G01G 504, G01G 314, G01G 138
Patent
active
058863010
ABSTRACT:
A device and method are described for measuring the weight of objects using a pneumatically sealed bellows which contains a pair of spaced apart capacitor plates. In accordance with the invention, the pneumatic pressure within the bellows is varied to maintain constant dimensions for the bellows and a constant distance between the electric capacitor plates. This pressure is therefore a function of the weight placed upon the bellows which exerts a pressure tending to force the walls of the bellows and the capacitor plates closer together thereby changing the electric capacitance between the capacitor plates. By adjusting the pneumatic pressure to maintain a constant electric capacitance and constant dimensions for the bellows, a convenient parameter is obtained from which the weight of objects placed on the bellows can be measured. The invention has particular application in the meteorological sciences.
REFERENCES:
patent: 3372764 (1968-03-01), Crotts
patent: 3672456 (1972-06-01), Hester
patent: 3672457 (1972-06-01), Hester
patent: 3874229 (1975-04-01), Ormond
patent: 4184555 (1980-01-01), Maltby et al.
patent: 4266263 (1981-05-01), Haberl et al.
patent: 4651838 (1987-03-01), Hamilton et al.
patent: 4917198 (1990-04-01), Sing
patent: 5092415 (1992-03-01), Asano
Gibson Randy W.
Gipple J. W.
Vitel, Inc.
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