Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1984-07-30
1986-07-15
Goldberg, E. A.
Weighing scales
Self-positioning
Electrical current generating or modifying
177185, 177229, G01G 314, G01G 308, G01G 2310
Patent
active
046000674
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns weighing apparatus of the type having strain guages, and it is particularly applicable to bathroom scales.
It is intended that such apparatus which, while being of a simple design, structure and low-cost is nevertheless reliable and precise.
For this purpose, the apparatus of the invention comprises a single bar integrated at its ends with a load receiving plate and with a support base respectively; at least two assemblies with strain gauges fastened to the bar sensitive to bending of the bar under the effect of the load applied, those assemblies, in combination with the zone of the bar with which they work and with a circuit to process the signals emitted by the gauges having the same measurement sensitivity for the same load applied. The apparatus further comprises at least a third assembly with a strain gauge fastened to the bar sensitive to twisting of the bar under the effect of the load applied and a circuit to process the signals emitted by the three strain gauge assemblies, further including means for combining the signals so as to eliminate in the outgoing signal the component resulting from strain of the bar in torsion.
The first two bending-sensitive assemblies contain identical gauges working together with the bar in zones of the same section.
Outside of the zones of measurement of the bending movement, the bar can be of variable section and/or composition, notably, at its fastening end or in the zone receiving the torsion-sensitive assembly.
Preferably, however, the bar is of uniform section, e.g., polygonal (square, rectangular, etc.) or curved (round, elliptical, etc.) or profiled (T, U, I, H, [, L, etc.).
The bar can be solid or tubular.
According to one preferred embodiment, each assembly contains a single gauge, the gauge of each assembly sensitive to bending being parallel to the general direction of the bar and the gauge of the assembly sensitive to twisting being inclined in that direction, e.g., by 45.degree..
In practice, each of the three strain gauge assemblies is sensitive to both bending and twisting, but for different parts, so that, by elimination of the twisting component in the outgoing signal, the bending component forming that outgoing signal is essentially defined by the two bending-sensitive components and, for a small part, the by twisting-sensitive component.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a vertical sectional view of the apparatus of the invention.
FIG. 2 is a plan view of the apparatus of FIG. 1.
FIG. 3 is a schematic view of an extensometric bridge formed by the gauges of the apparatus of FIGS. 1 and 2.
FIG. 4 is a partial vertical sectional view similar to FIG. 1 showing a bar equipped with strain gauges according to another embodiment.
FIG. 5 is a schematic view of the extensometric bridge formed by the gauges of FIG. 4; and
FIGS. 6 and 7 are views analogous to FIGS. 4 and 5, respectively, showing another embodiment of this invention.
DETAILED DESCRIPTION
The weighing apparatus, notably, a bathroom scale, shown in FIGS. 1 and 2, contains a sensitive element 1 formed by a single cylindrical bar of uniform cross-section. Preferably, as illustrated, the bar 1 is of circular cross-section, but that section could be of another curved shape, e.g., elliptical or even polygonal, such as square or rectangular, or even profiled (T, H, I, U, [, L, etc.).
At one end 2, the bar 1 is integrally connected to a load support plate 5 by fastening a screw 3 through a clamp 4 to hold load support plate 5. This support plate may comprise an upper plate 6 and a fork- or frame-shaped supporting structure 7, to which the plate 6 is attached and which is directly connected on the end 2.
At its other end 3, the bar 1 is integrally connected with a base 10 by fastening a screw 8 through a clamp 9 to base 10, whereby the weighing apparatus may rest on a support, such as the floor. The base 10 may have a lateral fitting 11, the upper edge of which is overhung by a lateral peripheral skirt of the plate 6. The base 10 may als
REFERENCES:
patent: 2597751 (1952-05-01), Ruge
patent: 3707076 (1972-12-01), Jones
patent: 3968683 (1976-07-01), Ormond
patent: 4380175 (1983-04-01), Griffen
patent: 4453609 (1984-06-01), Griffen et al.
Artigue Francis
Cormier Roland
Francois Christian
Berger Peter L.
Foster Patrick W.
Goldberg E. A.
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