Precision balance

Details Precision balance Precision balance

1975-03-05

1976-05-11

Hix, L. T.

Weighing scales

Self-positioning

Repositioning in response to deflection under load

177229, G01G 138

Patent

active

039556387

ABSTRACT:
A self-restoring precision balance which is essentially non-deflecting. Initially, the balance is unbalanced by an amount approximately equal to one half its weighing range, and the electrically energized restoring system is so arranged that a restoring force, is exerted in one direction to maintain the beam at a null condition at loads less than about one half scale, and is exerted in the opposite direction to maintain the beam at a null condition at loads greater than about one half scale. Heating in the restoring transducer is therefore reduced by a factor of 4. A unique arrangement of cross-flexures and a stabilizing band which remains always in tension, is used without affecting the accuracy of the balance, because of the small range of movement of the self-restoring system. A unique two coil electro-magnetic restoring arrangement provides for linearity at low cost.

REFERENCES:
patent: 3347328 (1967-10-01), Schieser et al.
patent: 3387679 (1968-06-01), Giulie et al.
patent: 3443653 (1969-05-01), Marshall
patent: 3677557 (1972-07-01), Baumgartner
patent: 3688854 (1972-09-01), Strobel
patent: 3799281 (1974-03-01), Wernitz
patent: 3816156 (1974-06-01), Baumann

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