Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1993-10-04
1997-09-23
Gellner, Michael L.
Weighing scales
Self-positioning
Electrical current generating or modifying
7386265, G01G 314, G01L 104, G01L 120
Patent
active
056707533
ABSTRACT:
The invention relates to a disc-shaped transducer (10) for a weighing system, comprising surfaces (14) which extend parallel to one another and in a direction of application of a force (F) to be measured, at least one of said surfaces being provided with a sensing element (13) for converting a force-dependent deformation into a useful signal. Transducers (10) of this kind usually exhibit a material-dependent, significant hysteresis effect which adversely affects their calibration possibilities; therefore, the transducer (10) comprises four sub-faces (21) which are formed by a centre line (17) parallel to the direction of application of the force (F) and a centre line (20) which is orthogonal thereto, at least two of said sub-faces which adjoin one another in only one point comprising a respective area of reduced cross-section or reduced thickness, so that the hysteresis can be compensated for.
REFERENCES:
patent: 4478086 (1984-10-01), Gram
patent: 4546838 (1985-10-01), Ormond
patent: 4589291 (1986-05-01), Sander
patent: 4694921 (1987-09-01), Johnston
patent: 4702329 (1987-10-01), Click
"Compression Load Cells, 1986" Revere Corp. of Europe GmbH, 6382 Friedrichsdorf 2, DE.
Barschall Anne E.
Botjer William L.
Gellner Michael L.
Gibson Randy W.
Schaier Arthur G.
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