Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1984-08-17
1986-04-29
Miller, Jr., George H.
Weighing scales
Self-positioning
Electrical current generating or modifying
361278, 361283, 361290, G01G 314, H01G 501, H01G 700, H01G 516
Patent
active
045850828
ABSTRACT:
A platform weight scale comprising a capacitative load cell sensing means configured to be insensitive to off center loading of the horizontal platform regardless of load amount or location on the platform. The platform is supported by a plurality of springs selected for equal spring rates. The load cell is electrically connected into a FET (Field Effect Transistor), CMOS (Complementary Metal Oxide Semiconductor) or Bi-Polar semiconductor multivibrator circuit selected and designed to sense electric currents on the order of 10.sup.-13 amperes. In one preferred embodiment the load cell comprises a grounded hemispherical surface opposing a flat charged plate. In alternate embodiments the load cell comprises a differential capacitor or a parallel plate capacitor suspended in a manner that is insensitive to off center loading. The differential capacitor load cell embodiment utilizes an alternating switch circuit as a part of the multivibrator circuit. As a third alternative, a frequency modulated system clock circuit that is modulated by the load cell capacitance or differential capacitance may be utilized as the weight sensing circuit and driver for peripheral attachments to the scale circuit.
REFERENCES:
patent: 1871048 (1932-08-01), Dubilier
patent: 2721976 (1955-10-01), Wojciechowski
patent: 3966002 (1976-06-01), Schneider
patent: 4372405 (1983-02-01), Stuart
patent: 4381040 (1983-04-01), Brouwer
Harrington Richard H.
Krapf Charles W.
Deimen James M.
Miller Jr. George H.
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