Weighing scale with a load cell

Details Weighing scale with a load cell Weighing scale with a load cell

1983-12-22

1986-03-25

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

177229, 177255, 7386265, G01G 314, G01G 308, G01G 2124, G01L 122

Patent

active

045777098

ABSTRACT:
There is disclosed a weighing scale in which a non-Roberval type load cell is used to detect a weight to be measured. The load cell used consists of two parallel cantilevers with the free ends connected to each other through a connecting means and of four strain gauges applied to the cantilevers by sticking every two of the four strain gauges on two separate positions in the longitudinal direction of each of the cantilevers. The four strain gauges constitute a bridge circuit which outputs the weight value of a weight placed on a weighing tray connected to the two cantilevers so that the center of the tray is positioned above the center of the plane made by the two cantilevers. According to this invention the weighing errors due to an eccentric or uneven weight loading on the tray are automatically eliminated on account of the structural symmetry of the load cell used. The difficulties in manufacturing a Roberval type precision load cell have finally be put out of the way by the present invention.

REFERENCES:
patent: 3477532 (1969-11-01), Wilder
patent: 3667560 (1972-06-01), Cooke
patent: 4107985 (1978-08-01), Sommer
patent: 4143724 (1979-03-01), Jacobson
patent: 4380175 (1983-04-01), Griffen
patent: 4396079 (1983-08-01), Brendel
patent: 4476946 (1984-10-01), Smith

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