Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1978-05-01
1979-07-03
Hartary, Joseph W.
Weighing scales
Self-positioning
Electrical current generating or modifying
177212, G01G 702
Patent
active
041597478
ABSTRACT:
A weighing system is disclosed of the electromagnetic compensation return-to-neutral type including first and second series-connected compensation coils connected with the weighing pan support, a supply of compensating current connected with the compensation coils, a periodically operable position-responsive switch connected in parallel across the first compensation coil for dividing the compensating current into a continuous first current portion which generally corresponds with the preloading effect of the load support, and a second portion that is periodically supplied to the first coil for periods of time that are a function of the magnitude of the load applied to the load support, and an indicating device responsive only to the second compensating current portion for indicating the magnitude of the load as a function of the compensating current required to return the load support to its neutral position, characterized by the provision of an impedance component electrically connected in parallel with, and physically arranged in spaced non-heat-conducting relation to, the second compensation coil, thereby to stabilize the preloading effect for variations in temperature of the weighing system components during use. Preferably the impedance component and the second compensation coil are formed of materials having generally the same coefficient of thermal resistivity. The impedance component may be a multi-tap coil or a resistor.
REFERENCES:
patent: 4034819 (1977-07-01), Akers
patent: 4099587 (1978-07-01), Kaufmann
Hartary Joseph W.
Laubscher Lawrence E.
Mettler Instrument AG
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