Weighing scales – Self-positioning – Repositioning in response to deflection under load
Patent
1990-10-30
1992-01-21
Miller, Jr., George H.
Weighing scales
Self-positioning
Repositioning in response to deflection under load
177229, 177255, G01G 700, G01G 308, G01G 2124
Patent
active
050820737
ABSTRACT:
An electronic balance with a system carrier (1) fixed to the housing, a load receiver (2) with two guide rods (3/4) which function as parallel guide, connect the load receiver to the system carried in a vertically movable manner, with four protruding arms (5, 6) which are fastened to the load receiver (2) and carry supports points (7, 8, 9, 10) for a balance scale on their ends and with a low-travel measured value receiver (14, 15) which is loaded either directly by the force of weight acting on the balance scale or with the interpositioning of a translation lever (11). The protruding arms (5, 6) comprise a central recess (19, 20) in front of their ends (17, 18) so that an upper web (21, 23) and a lower web (22, 24) remain and form a parallel guide for the particular support point (7, 8, 9, 10) of the balance scale. Each of the four support points (7, 8, 9, 10) of the balance scale is associated with a wire strain gauge (27, 28, 29, 30) located on one of the associated webs (21, 23). These four or eight wire strain gauges (27, 28, 29, 30) are arranged in such a manner on the webs (21, 23) that they are all expanded, stressed upon an approximately central loading of the balance scale. These four wire strain gauges (27, 28, 29, 30) are wired to two half bridges and the output signals of the two half bridges are added with presettable values to the output signal of the measured value receiver (14, 15).
REFERENCES:
patent: 4276949 (1981-07-01), Knothe et al.
patent: 4674582 (1987-06-01), Kunz
patent: 4722409 (1988-02-01), Kunz
patent: 4799561 (1989-01-01), Komoto
patent: 4813505 (1989-03-01), Sodler
patent: 4938300 (1990-07-01), Kunz
Eger Matthias
Stadler Eberhard
Miller Jr. George H.
Sartorius AG
Schellin Eric P.
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