Automatic weighing machine with minimized angle error and moment

Details Automatic weighing machine with minimized angle error and moment Automatic weighing machine with minimized angle error and moment

1985-02-15

1987-03-17

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

177DIG9, 7386265, G01G 314, G01L 122

Patent

active

046500162

ABSTRACT:
A weighing machine where a load generates proportional bending moments in a pair of parallel beams having strain-gauges. Resolution is greatly increased by shaping each end of the beams so that the points thereof where load and reactive forces are applied lie in a single horizontal plane. Thus, firstly, the separation between the load and reaction application points, at each beam end, which influences the weight-to-strain transfer function, is far less dependent on beam deflection, and, secondly, the error moments due to the inevitable horizontal forces are greatly minimized. Preferably, the application points form coupling edges in contact with a planar face of respective coupling members, thus assisting in maintaining said separation constant. When long beams are specified, their central portion is rigidized to avoid error magnification brought about by excessive beam deflection, and the strain-gauges are symmetrically connected at flexible portions near the ends thereof, to obtain a reading independent of load eccentricity.

REFERENCES:
patent: 2849260 (1958-08-01), Rikken
patent: 2899191 (1959-08-01), Hunt
patent: 3938603 (1976-02-01), Shoberg et al.
patent: 4456085 (1984-06-01), Boyles
patent: 4457385 (1984-07-01), Provi

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