Portable electronic scale of minimal thickness and weight

Details Portable electronic scale of minimal thickness and weight Portable electronic scale of minimal thickness and weight

1988-03-04

1989-01-31

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

177210C, 7386265, G01G 314, G01L 122

Patent

active

048009733

ABSTRACT:
A portable electronic scale of minimal thickness and weight is provided which is suitable for measuring the weight of an individual or object and which can be easily carried in a bag, stored in a cabinet or hung on a wall. The scale comprises a single load-bearing composite plate of composite (sandwich) construction with its principle strength concentrated on its top and bottom surfaces, and including a center core plate which includes a number of small cavities for electronic components. A plurality of shallow supporting feet exert a force from below on a plurality of mechanically deformable elements embedded rigidly in the composite plate, which force is measured and translated by electronic transducers such as strain gauges into electrical signals. These signals are summed in a Wheatstone bridge configuration, amplified and converted electronically to a digital display of the weight. The electronic circuitry fits within the composite plate and consumes very small amounts of current when in use so that the need for a thick battery is eliminated. The scale (excluding the shallow feet) is less than 1/4" in thickness and weighs less than one pound.

REFERENCES:
patent: D274991 (1984-08-01), Wirtz
patent: D281236 (1985-11-01), Muller et al.
patent: D288071 (1987-02-01), Muller
patent: 2910287 (1955-12-01), Hags
patent: 4043413 (1987-08-01), Schaenen
patent: 4174760 (1979-11-01), Curchod
patent: 4355692 (1982-10-01), Ostrelich
patent: 4363368 (1982-12-01), Paddon et al.
patent: 4685526 (1987-08-01), Holm
patent: 4739848 (1988-04-01), Tulloch

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