Electronic scale with non-parallel capacitance means

Details Electronic scale with non-parallel capacitance means Electronic scale with non-parallel capacitance means

1983-08-24

1985-06-25

Goldberg, E. A.

Weighing scales

Self-positioning

Electrical current generating or modifying

7386264, G01G 314

Patent

active

045248400

ABSTRACT:
An electronic scale device used for weighing an object or material. The device includes a platform arranged to move upon receipt of a material thereon. The device further includes variable capacitance means arranged to move upon receipt of a material thereon and comprising a first plate and a second plate with one of the plates being movable. Movement of the platform means upon receipt of the material thereon causes a displacement of the movable plate relative to the other plate to produce a signal indicative of the weight of the material being weighed. The displacement of the movable plate is achieved by having the movable plate rotate about a fixed axis of rotation. Moreover, the plates are disposed so as to be non-parallel to each other over the entire operational range of movement of the movable plate, whenever the plates are not abutting each other. In one embodiment of the invention, the distances between all points on one plate and their respective corresponding points on the other plate is proportional to the respective distances each of those points is from the axis of rotation, throughout the entire operational range of movement of the movable plate.

REFERENCES:
patent: 4273204 (1978-05-01), Gillen
patent: 4308929 (1982-01-01), Estavoyer
Stein, H. K., Calculus and Analytic Geometry, McGraw-Hill, New York, 2nd Edition, pp. 362-363.
Brookes-Smith, C. H. and Colls, J. A., "The Measurement of Pressure, Movement, Acceleration, and Other Mechanical Quantities by Electrostatic Systems", Journal of Scientific Instruments, v 16, No. 12, pp. 361-366.
Foldvari, T. L. and Lion, K. S., "Capacitive Transducers", Instruments and Control Systems, Nov. 1964, pp. 77-85.
Hetenyi, M., Handbook of Experimental Stress Analysis, Wiley and Sons, New York, 1950, pp. 273-285, 298-300.
Neubert, H. K. P., Instrument Transducers: An Introduction to Their Performance and Design, Clarendon Press, Oxford, 2nd Edition, pp. 225-252.

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