Weighing scales – Self-positioning – Repositioning in response to deflection under load
Patent
1979-08-10
1981-01-20
Hartary, Joseph W.
Weighing scales
Self-positioning
Repositioning in response to deflection under load
177210EM, G01G 702
Patent
active
042457114
ABSTRACT:
Weighing apparatus of the electromagnetic load compensation type is disclosed, including a load support connected for movement relative to a frame, a mechanical-transmission ratio-establishing lever connecting the load support with a compensation coil arranged for displacement relative to a permanent magnet arrangement connected with the frame, a position-responsive circuit for supplying compensation current to the coil for creating an electromagnetic force that reacts with the permanent magnet field to maintain the load support in its initial no-load condition, and indicating means for displaying the magnitude of the applied load as a function of the compensation current. To permit the use of the lever in different lever-ratio-establishing environments without the use of attendant balancing weights, the compensation coil is tapped to define a pair of coil portions (28a, 28b) that are alternately energized by a switching device (42) to apply different forces upon the load support.
REFERENCES:
patent: 3786678 (1974-01-01), Kunz
patent: 3786884 (1974-01-01), Allenspach
patent: 3816156 (1974-06-01), Baumann
patent: 3955638 (1976-05-01), Wasko
patent: 4109738 (1978-08-01), Kunz
Hartary Joseph W.
Mettler Instrument AG
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