FR2527768A2 - Resistance strain gauge sensor - is formed of parallelepipedal block of alloy with central aperture and symmetrical strain gauges - Google Patents

Resistance strain gauge sensor - is formed of parallelepipedal block of alloy with central aperture and symmetrical strain gauges Download PDF

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Publication number
FR2527768A2
FR2527768A2 FR8209337A FR8209337A FR2527768A2 FR 2527768 A2 FR2527768 A2 FR 2527768A2 FR 8209337 A FR8209337 A FR 8209337A FR 8209337 A FR8209337 A FR 8209337A FR 2527768 A2 FR2527768 A2 FR 2527768A2
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FR
France
Prior art keywords
block
strain gauges
gauge sensor
alloy
symmetrical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR8209337A
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French (fr)
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FR2527768B2 (en
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Individual
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Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to FR8209337A priority Critical patent/FR2527768A2/en
Priority to EP19820902072 priority patent/EP0083351A1/en
Priority to PCT/FR1982/000117 priority patent/WO1983000222A1/en
Publication of FR2527768A2 publication Critical patent/FR2527768A2/en
Application granted granted Critical
Publication of FR2527768B2 publication Critical patent/FR2527768B2/fr
Granted legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01L1/2243—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being parallelogram-shaped
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
    • G01G3/1402—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01G3/1412—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being parallelogram shaped

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The sensor is constituted by a parallelepipedal block (1) machined or pressure-moulded with a pref. asymmetric central hole (2), trapezoidal in shape with corners rounded into semi-cylindrical grooves (3). The thickness (E) of material between the grooves (3), or between them and the edges (4,5) of the block, may be variable or may differ between the top and base. Four strain gauges (6) are arranged symmetrically on the face (4) of the block corresp. to the longest side (AB) of the trapezoid. After rough machining or moulding the block is either varnished or anodised or simply coated with a thin layer of insulating paint or enamel. Alternatively, the central hole may be a symmetrical arrangement of two intersecting circular cylinders, and the strain gauges consequently arranged asymmetrically.

Description

Le présent certificat d'addition a pour objet un perfectionnement à la demande de brevet nO 81-13 394 du 8 juillet 1981 aux noms des demandeurs. Dans la demande de brevet précitée on a décrit un procédé de réalisation d'un capteur à jauge constitué d'un bloc métallique de forme parallélépipèdique du type comportant un évidement central obtenu par usinage, ou moulage sous pression d'un alliage métallique; ledit évidement central étant de forme dissymétrique ou comportant des saignées asymétriques, des jauges étant disposées sur un seul des côtés du bloc ainsi réalisé. The present certificate of addition relates to an improvement to patent application No. 81-13 394 of July 8, 1981 in the names of the applicants. In the aforementioned patent application, a method has been described for producing a gauge sensor constituted by a metal block of parallelepipedal shape of the type comprising a central recess obtained by machining, or pressure molding of a metal alloy; said central recess being of asymmetrical shape or comprising asymmetrical grooves, gauges being arranged on only one of the sides of the block thus produced.

Il est apparu aux demandeurs qu'il était avantageux également d'utiliser une structure symétrique pour réduire encore le coût de réalisation du capteur à jauge en simplifiant sa fabrication. Toutefois, ce capteur doit rester insensible à la variation de position de la charge sur le plateau de la balance dans laquelle il est utilisé, afin d'obtenir des performances identiques à celles obtenues avec les capteurs objets de la demande de brevet principal. It appeared to the applicants that it was also advantageous to use a symmetrical structure to further reduce the cost of producing the gauge sensor by simplifying its manufacture. However, this sensor must remain insensitive to the variation in the position of the load on the weighing pan in which it is used, in order to obtain performance identical to that obtained with the sensors which are the subject of the main patent application.

Le présent perfectionnement a pour objet d'atteindre ce but au moyen d'un capteur ayant une structure symétrique, caractérisé en ce que les jauges sont disposées de manière dissymétrique de part et d'autre des axes de contrainte maximale sur l'un des côtés dudit capteur. The object of the present improvement is to achieve this aim by means of a sensor having a symmetrical structure, characterized in that the gauges are arranged asymmetrically on either side of the axes of maximum stress on one of the sides. of said sensor.

On appelle axe de contrainte maximale la partie d'un capteur la plus mince, ctest-à-dire la partie la plus faible où se produit la déformation due à une contrainte exercée sur le capteur. On obtient plusieurs axes de contrainte maximale sur un même capteur en donnant à l'évidement intérieur des formes diverses, qui peuvent être symétriques par rapport aux axes vertical et horizontal. De plus cette réalisation permet un mode de fabrication original des capteurs à partir de profilés métalliques extrudés. The thinnest part of a sensor is called the axis of maximum stress, that is to say the weakest part where deformation occurs due to a stress exerted on the sensor. Several axes of maximum stress are obtained on the same sensor by giving the interior recess various shapes, which can be symmetrical with respect to the vertical and horizontal axes. In addition, this embodiment allows an original method of manufacturing the sensors from extruded metal profiles.

L'invention sera mieux comprise à la lecture de la description qui suit d'un mode de réalisation de l'invention et à l'examen du dessin annexé représentant un capteur à jauge selon le présent certificat d'addition.  The invention will be better understood on reading the following description of an embodiment of the invention and on examining the appended drawing representing a gauge sensor according to this certificate of addition.

En se reportant au dessin annexé représentant un capteur selon le présent certificat d'addition, on voit qu'il est constitué comme dans la demande de brevet principal par un bloc métallique parallélépipèdique 1 comportant en son centre un évidement 2 ayant dans l'exemple représenté une section formée de deux cercles sécants 3, 4. Ce bloc 1 forme dans cette réalisation une structure symétrique de part et d'autre des axes X-X et Y-Y. Les axes de contrainte maximale a-a passent par les centres des cercles 3, 4. L'épaisseur e de matière sur ces axes a-a peut être variable, de même que l'épaisseur E dudit bloc 1. Les jauges 6-6a et 7-7a sont disposées sur un seul côté du bloc 1, mais dans ce cas de manière dissymétrique, c'est-à-dire de part et d'autre des deux axes a-a de contrainte maximale, et du côté extérieur à ces axes, comme représenté sur le dessin. Referring to the appended drawing representing a sensor according to the present certificate of addition, it can be seen that it is constituted, as in the main patent application, by a parallelepipedal metal block 1 having at its center a recess 2 having in the example shown a section formed by two intersecting circles 3, 4. This block 1 forms in this embodiment a symmetrical structure on either side of the axes XX and YY. The axes of maximum stress aa pass through the centers of circles 3, 4. The thickness e of material on these axes aa can be variable, as can the thickness E of said block 1. Gauges 6-6a and 7-7a are arranged on one side of block 1, but in this case asymmetrically, that is to say on either side of the two axes aa of maximum stress, and on the side external to these axes, as shown in the drawing.

Le bloc 1 lui-même peut être obtenu dans cette réalisation avantageusement à partir d'un profilé métallique extrudé par exemple, que l'on coupe en tranches d'une épaisseur E plus ou moins importante en fonction de ltélasticité de l'ensemble que l'on veut obtenir. Une telle réalisation permet d'abaisser considérablement le coût de fabrication des capteurs a jauge sans pour cela en amoindrir leur fiabilité. The block 1 itself can be obtained in this embodiment advantageously from an extruded metal profile for example, which is cut into slices of a thickness E more or less important as a function of the elasticity of the assembly than the 'we want to get. Such an embodiment makes it possible to considerably lower the manufacturing cost of the gauge sensors without thereby reducing their reliability.

Bien entendu le bloc 1 peut être obtenu comme dans la demande de brevet principal soit par extrusion, soit par moulage sous pression, de même que l'évidement 2 peut avoir une configuration différente -de l'exemple représenté.  Of course the block 1 can be obtained as in the main patent application either by extrusion or by pressure molding, just as the recess 2 can have a different configuration - from the example shown.

Claims (2)

REVENDICATIONS 1. Capteur à jauge perfectionné constitué par un bloc métallique de forme parallélépipèdique (1) du type comportant un évidement central (2) selon le brevet principal, caractérisé en ce que dans cette réalisation ledit bloc (1) forme une structure symétrique, les jauges (6-6a, 7-7a) étant disposées de façon dissymétrique de part et d'autre des deux axes (a-a) de contrainte maximale et sur un seul des côtés du bloc. 1. Improved gauge sensor constituted by a metal block of parallelepiped shape (1) of the type comprising a central recess (2) according to the main patent, characterized in that in this embodiment said block (1) forms a symmetrical structure, the gauges (6-6a, 7-7a) being arranged asymmetrically on either side of the two axes (aa) of maximum stress and on only one of the sides of the block. 2. Capteur à jauge perfectionné selon 1, caractérisé en ce que le bloc (1) formant une structure symétrique est obtenu par découpage d'un profilé métallique, de manière telle que l'on obtienne un bloc d'épaisseur désirée.  2. Improved gauge sensor according to 1, characterized in that the block (1) forming a symmetrical structure is obtained by cutting a metal profile, so that a block of desired thickness is obtained.
FR8209337A 1981-07-08 1982-05-28 Resistance strain gauge sensor - is formed of parallelepipedal block of alloy with central aperture and symmetrical strain gauges Granted FR2527768A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR8209337A FR2527768A2 (en) 1982-05-28 1982-05-28 Resistance strain gauge sensor - is formed of parallelepipedal block of alloy with central aperture and symmetrical strain gauges
EP19820902072 EP0083351A1 (en) 1981-07-08 1982-07-08 Improved gauge sensors
PCT/FR1982/000117 WO1983000222A1 (en) 1981-07-08 1982-07-08 Improved gauge sensors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8209337A FR2527768A2 (en) 1982-05-28 1982-05-28 Resistance strain gauge sensor - is formed of parallelepipedal block of alloy with central aperture and symmetrical strain gauges

Publications (2)

Publication Number Publication Date
FR2527768A2 true FR2527768A2 (en) 1983-12-02
FR2527768B2 FR2527768B2 (en) 1985-03-08

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FR8209337A Granted FR2527768A2 (en) 1981-07-08 1982-05-28 Resistance strain gauge sensor - is formed of parallelepipedal block of alloy with central aperture and symmetrical strain gauges

Country Status (1)

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FR (1) FR2527768A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0227597B1 (en) * 1985-12-17 1990-11-07 S.C.A.I.M.E. Force measuring transducer with strain gauges

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0227597B1 (en) * 1985-12-17 1990-11-07 S.C.A.I.M.E. Force measuring transducer with strain gauges

Also Published As

Publication number Publication date
FR2527768B2 (en) 1985-03-08

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