Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1986-11-17
1987-10-06
Miller, Jr., George H.
Weighing scales
Self-positioning
Electrical current generating or modifying
177 1, 177 25, 177245, 364568, 310321, G01G 314, G01G 1900, H01L 4104
Patent
active
046976574
ABSTRACT:
A piezoelectric device is used to determine the absolute weight of an unknown sample by comparison to a control sample whose weight is known. A piezoelectric driver is resiliently attached to a base that is isolated from vibrations. A piezoelectric receiver and a reed are resiliently attached to the piezoelectric driver so that (1) the reed is moved in response to motion of the piezoelectric driver, and (2) the piezoelectric receiver gives an electric signal out proportional to motion of the system. The entire system is set to operate on the leading edge of the resonant frequency for the system. By applying an oscillating sine wave voltage, such as 140 hertz, to the piezoelectric driver, and by applying a known mass to the tip of the reed, a first output is obtained from the piezoelectric receiver which represents the calibrated weight. Next by exchanging an unknown sample for the known mass, a second output is obtained that represents the second weight. By a ratio of the second output/first output (or a signal equivalent to the weights being measured), the absolute weight of the unknown sample is determined.
REFERENCES:
patent: 3814914 (1974-06-01), List et al.
patent: 3926271 (1975-12-01), Patashnick
patent: 3973636 (1976-08-01), Uchida
patent: 4165633 (1979-08-01), Raisanen
patent: 4168623 (1979-09-01), Thomas, Jr.
patent: 4316384 (1982-02-01), Pommer et al.
patent: 4544858 (1985-10-01), Nishiguchi et al.
Margraf David J.
Portman, Jr. Joe L.
Miller Jr. George H.
Musgrove Jack V.
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