Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1985-10-21
1986-11-18
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
046230300
ABSTRACT:
A piezoelectric device is used to determine a ratio of a second weight with an original weight where the second weight is less than the original weight. 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 read 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 an unknown mass to the tip of the reed, a first output is obtained from the piezoelectric receiver which represents the original weight. Next by removing part of the mass by any convenient means, such as heat, 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 percent of the mass remaining is determined.
REFERENCES:
patent: 3814914 (1974-06-01), List et al.
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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.
Alcor, Inc.
Miller Jr. George H.
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