Weighing scales – Self-positioning – Repositioning in response to deflection under load
Patent
1976-01-19
1977-08-02
Hartary, Joseph W.
Weighing scales
Self-positioning
Repositioning in response to deflection under load
177185, 177210C, 177210EM, 318629, 333 75, G01G 700
Patent
active
040390365
ABSTRACT:
Weighing apparatus of the electromagnetic load compensation type is disclosed including zero-position detector means for generating a position signal that is a function of the extent to which a loaded weighing pan or the like is displaced from its no-load position, and regulating means responsive to said position signal for generating a compensating current for displacing the weighing pan toward its no-load position, characterized by the provision of filter means connected between the zero-position detector and the regulating means for suppressing the undesired extraneous interference acceleration signals produced, for example, by external shock or vibration forces imparted to the weighing apparatus. In one embodiment, the filter electrical components are constant, and in a second embodiment, means are provided for varying the electrical characteristics of at least some of the filter components as a function of the load applied to the weighing pan.
REFERENCES:
patent: 2167079 (1939-07-01), Landon
patent: 2734736 (1956-02-01), Payne
patent: 3172493 (1965-03-01), Koch et al.
patent: 3639825 (1972-02-01), MacMullan
patent: 3677357 (1972-07-01), Baumgartner
patent: 3753472 (1973-08-01), Dybwad et al.
patent: 3802522 (1974-04-01), Thompson
Baumgartner Max
Bucher Anton
Utzinger Diethelm
Hartary Joseph W.
Laubscher Lawrence E.
Mettler Instrumente AG
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