Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1974-10-31
1976-07-13
Miller, Jr., George H.
Weighing scales
Self-positioning
Electrical current generating or modifying
177212, 177185, G01G 314, G01G 700, G01G 2310
Patent
active
039688500
ABSTRACT:
An electromagnetic weighing balance includes a load support system for supporting the mass to be weighed and including an electromagnetic balance coil disposed in a magnetic field and fed with a balance current producing on the support system a force balancing the weight. The magnitude of the current is taken as a measure of the weight. In order to reduce the effect of vibration the balance coil is fed from a high-impedance source and the balance circuit controlling the balance current in response to displacement of the support system from a datum position includes threshold means increasing the high-frequency gain in response to displacements in excess of threshold levels. Sensor means developing a control signal representative of support system displacement includes a balanced inductive displacement transducer, the output signal from which is combined with components derived by rectifying the energizing alternating voltage to devise a control signal representing the magnitude and direction of the support system.
REFERENCES:
patent: 2801840 (1957-08-01), Shrader
patent: 2914310 (1959-11-01), Bahrs
patent: 2940747 (1960-06-01), Eder et al.
patent: 3092197 (1963-06-01), Ecker
patent: 3186504 (1965-06-01), Van Wilgen
patent: 3677357 (1972-07-01), Baumgartner
patent: 3799281 (1974-03-01), Wernitz
patent: 3802522 (1974-04-01), Thompson et al.
International Electronics Limited
Miller Jr. George H.
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