EP1743154A1 - Device for controlling working stresses of elongated members, in particular safety belts and control method - Google Patents

Device for controlling working stresses of elongated members, in particular safety belts and control method

Info

Publication number
EP1743154A1
EP1743154A1 EP05763715A EP05763715A EP1743154A1 EP 1743154 A1 EP1743154 A1 EP 1743154A1 EP 05763715 A EP05763715 A EP 05763715A EP 05763715 A EP05763715 A EP 05763715A EP 1743154 A1 EP1743154 A1 EP 1743154A1
Authority
EP
European Patent Office
Prior art keywords
support member
separable
force
force sensor
elongated
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.)
Withdrawn
Application number
EP05763715A
Other languages
German (de)
French (fr)
Inventor
Francis Gibert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
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
Publication of EP1743154A1 publication Critical patent/EP1743154A1/en
Withdrawn legal-status Critical Current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
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
    • G01L5/102—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means using sensors located at a non-interrupted part of the flexible member

Definitions

  • the invention relates to a tension force controller for elongated members, such as seat belt straps, and a method for monitoring. control of tension forces of such organs.
  • Seat belt force controllers are already known. They are generally used in crash tests to determine the properties of seat belts.
  • Figures 1 and 2 show an example of a force controller for a strap of this type.
  • a controller body comprises two flanges 12 which support two support members or parallel bars 14, shown with a cylindrical section, and an opposite support member 16. The support members delimit between them a path through which passes a seat belt 18.
  • the path between the two bars 14 placed on one side and the member 16 placed on the other side is slightly sinuous so that, when a tensile force is exerted on the strap, a transverse component is applied on one side to the bars 14 and on the other side to the support member 16.
  • the controller in the embodiment shown in FIGS. 1 and 2, comprises a sensor for forces incorporated in the support member 16. This sensor is connected to a measuring device by a cable or by a wireless link. The measurement range of this sensor covers the values of the forces experienced during a crash test. In the different types of crash tests, the forces applied must be able to reach at least 10 N or 20 kN and even more.
  • a controller comprising a force sensor sufficiently precise for the measurement of the forces of prior tension must have a weight of 1 * order of 300 g.
  • a light weight force controller such as that shown in FIGS. 1 and 2 does not excessively disturb the measurements during a crash test, while a force sensor of 300 g disturbs them considerably because it is subjected to considerable efforts.
  • the invention relates to a tension force controller of elongated members, such as seat belt straps, which is a simple, precise and inexpensive solution.
  • This solution includes the use of an additional support member provided with a prior tension force sensor and which is interchangeable with another of the support members of the force controller, this member being separable.
  • the force controller is provided with a member comprising the sensor of pre-tension forces which is used for determining the pre-tension force.
  • the separable member provided with the prior tension force sensor is removed and replaced by a geometrically interchangeable member. In this way, the pre-tension force is not changed, and the force controller can absorb the forces experienced during the crash tests.
  • the invention relates to a controller of tension forces of elongated members, of the type which comprises a body delimiting a non-rectilinear path for the passage of an elongated member between at least two support members placed in a first side and at least one support member placed on the second side, at least one of the support members being provided with a force sensor having a measuring range covering the forces undergone during a crash test, each support member on at least one side of the path being separable from the body, so that the tension force controller can be placed on an elongate member by separating each support member separable from the body, then by fixing each separable support member on the body; according to 1 • invention, the controller further comprises an additional support member geometrically interchangeable with a separable support member, the member additional support being provided with a second force sensor having a measuring range covering the prior tension forces of the elongated member, the force controller having two different configurations depending on whether a support member separable from the body comprises the second force sensor or not.
  • the body comprises two support members formed by two bars placed on a first side, and a single support member placed on the second side.
  • the two support members are separable, and the additional support member is intended to replace one of the two separable support members.
  • the single member supporting the second side comprises the first force sensor.
  • one of the two separable members comprises the first force sensor.
  • the member the additional support is analogous to and interchangeable with the single support member on the second side. It is therefore advantageous for the single support member on the second side to include the first force sensor.
  • one of the two support members placed on the first side comprises the first force sensor.
  • the body comprises two lateral flanges intended to support the ends of the bars of the support members.
  • the additional support member comprises at least one dynamometric gauge.
  • the controller comprises a flexible cable connected to the first force sensor, and a flexible cable connected to the second force sensor.
  • the invention also relates to a method for controlling the tension forces of elongated members, such as seat belt straps, of the type which comprises a first step of adjusting a prior tension force of the elongated member with measurement.
  • FIG. 1 already described, is a schematic view in side elevation of a force controller;
  • Figure 2 is a plan view of the force controller of Figure 1; and
  • FIG. 1 is a schematic view in side elevation of a force controller;
  • FIG. 3 is a side elevation view in section of an alternative force controller which can be produced according to the invention.
  • the invention can be implemented with the force controller shown in Figures 1 and 2, provided with an additional member.
  • the two bars 14 constitute separable support members, placed on a first side of the strap 16 and which are formed of solid metal rods which can be screwed into one of the flanges of the body.
  • the member 16 placed on the other side is provided with a collision test force sensor, that is to say which can undergo forces up to 15, 20 or 25 kN or more.
  • the force controller can be used according to the invention, it further comprises an additional bar 14 forming a support member interchangeable with one of the bars 14, having external dimensions identical to those of the bars 14 and preferably identical mechanical properties.
  • this additional support member is provided with a force sensor having a measuring range covering the prior tension forces, for example between a few newtons and 1 kN.
  • the force controller is mounted on the strap 18, and the bars used are on the one hand a normal bar 14 and on the other hand the additional bar having the second force sensor. In this way, by connecting the measuring cable of the additional bar to a measuring device, the strap can be brought to the desired pre-tension.
  • the additional support member having the second force sensor is removed and is replaced by an interchangeable solid bar lacking a second sensor. Given the geometrical interchangeability of the two organs, the strap is subjected to the same preliminary tension.
  • FIG. 3 represents a variant of force controller in which two bars 22 are placed on one side of the strap 18 and a sensor 24 of the crash test forces is placed in a support member on the other side of a body 20.
  • the central part of the body 20 advantageously has a shape which allows the optimization of the measurements by the sensor 24 of the collision test forces.
  • one of the two bars 22 is constituted, in a first step, by a bar provided with a second sensor of prior tension forces and, in a second step, by a solid bar without sensor.
  • the first force sensor is associated with a single support member placed on a second side of the strap, while two separable support members not provided with a sensor or provided with a prior tension force sensor are placed on the other side and are separable.
  • the single support member 16 which is separable and, in the first step, it comprises a sensor of prior tension forces, and, in the second step, it includes a collision test force sensor.
  • the first step it is one of the bars 22 which includes the second sensor of forces of prior tension and, in the second step, it is replaced by another bar provided with the first sensor of forces d crash tests.
  • the first force sensor can be secured to one of the two bars which are not separable, and the second force sensor is secured to the single support member which is separable.
  • the invention also relates to a force control method for crash tests in which the same force controller according to the invention is used in a first step with a separable support member provided with a second force sensor. prior tension, and in a second step, in which collision test forces are measured, with a first force sensor secured to a separable member or not.
  • the invention has been described with reference to a seat belt strap, it applies to other elongated members having for example a circular or oval or other section. It is then preferable for the support members to have a shape adapted to the section of the elongated member used.
  • various modifications can be made by those skilled in the art to the controllers and methods which have just been described solely by way of nonlimiting example without departing from the scope of the invention.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention concerns a device for controlling forces. It concerns a controlling device comprising a body defining a non rectilinear path for passing a strap (18) between two support members (14) arranged on one first side and a support member (16) arranged on the second side, and provided with a sensor of forces experienced during an impact test, each support member (14) being separable from the body. An additional support member geometrically interchangeable with a separable support member (14) is provided with a second force sensor having a measuring range covering the prior working stress of the strap, the controlling device having two different configurations depending on whether a separable member comprises the second force sensor or not. The invention is useful for testing safety belts during impact tests.

Description

Contrôleur de forces de tension d'organes allongés, notamment de ceintures de sécurité, et procédé de contrôle L'invention concerne un contrôleur de forces de tension d'organes allongés, tels que des sangles de ceinture de sécurité, ainsi qu'un procédé de contrôle de forces de tension de telles organes. On connaît déjà des contrôleurs de forces pour ceinture de sécurité. Ils sont en général utilisés au cours d'essais de collision destinés à déterminer les propriétés des cein- tures de sécurité. Les figures 1 et 2 représentent un exemple de contrôleur de forces pour sangle de ce type. Comme l'indiqπxe la figure 1, un corps de contrôleur comporte deux flasques 12 qui supportent deux organes d'appui ou barres parallèles 14, représentés avec une section cylindrique, et un organe opposé d'appui 16. Les organes d'appui délimitent entre eux un trajet dans lequel passe une ceinture de sécurité 18. Le trajet entre les deux barres 14 placées d'un côté et l'organe 16 placé de l'autre côté est légèrement sinueux afin que, lorsqu'une force de traction est exercée sur la sangle, une composante transversale soit appliquée d'un côté aux barres 14 et de l'autre côté à l'organe d'appui 16. Le contrôleur, dans le mode de réalisation représenté sur les figures 1 et 2, comporte un capteur de forces incorporé à l'organe d'appui 16. Ce capteur est relié à un appareil de mesure par un câble ou par une liaison sans fil. La plage de mesure de ce capteur couvre les valeurs des forces subies au cours d'un essai de collision. Dans les différents types d'essais de collision, les forces appli- quées doivent pouvoir atteindre au moins 10 N ou 20 kN et même plus. Lors de l'utilisation d'un tel capteur, les barres 14, qui peuvent être séparées des flasques 12 par dévissage, sont retirées, le corps est placé sur la sangle, et les barres sont remises en position. Le frottement existant entre les deux barres et l'organe d'appui empêche le contrôleur de forces de se déplacer le long de la sangle 18 même lorsqu'elle n'est pas horizontale. Un tel capteur de forces donne satisfaction dans les essais de contrôle de la résistance des sangles de ceinture de sécurité suivant les normes habituelles. On s'est maintenant rendu compte qu'il était souhai- table de pouvoir exécuter les essais de collision après la mise de la sangle à une tension préalable. Par exemple, pour la fixation de certains accessoires, tels que des sièges d'enfant, il est souhaitable que la sangle soit soumise à une force de tension préalable de 50 N. Dans un tel essai, il faut donc, dans une première étape, régler la tension préalable de la sangle à une valeur déterminée, en mesurant cette valeur, puis, dans l'essai ultérieur de collision, mesurer les forces appliquées à la sangle. On s'est rendu compte que les capteurs de forces utili- ses dans les contrôleurs de forces décrits en référence aux figures 1 et 2 n'avaient pas une précision suffisante dans la plage des faibles valeurs, et ne permettaient donc pas la réalisation des essais précités sans utilisation d'un appareil complémentaire. On a donc envisagé de remplacer le capteur de forces utilisé par un capteur possédant une plus grande précision dans une plage couvrant les faibles valeurs de force. On s'est alors rendu compte qu'un contrôleur de forces muni d'un tel capteur avait un poids très élevé. Par exemple, alors que le contrôleur de forces représenté sur les figures 1 et 2 a un poids de 65 g, un contrôleur comprenant un capteur de forces suffisamment précis pour la mesure des forces de tension préalable doit avoir un poids de 1 *ordre de 300 g. Dans un essai de collision, les forces d'accélération appliquées au contrôleur de forces sont considérables. Un contrôleur de forces ayant un faible poids, tel que celui qui est représenté sur les figures 1 et 2, ne perturbe pas excessivement les mesures au cours d'un essai de collision, alors qu'un capteur de forces de 300 g les perturbe considérablement car il est soumis à des efforts considérables. On pourrait aussi envisager d'ajouter au contrôleur de forces un capteur de forces de tension préalable, de précision suffisante, par exemple dans l'une des barres 14. Cependant, dans une telle réalisation, à chaque essai de collision, le capteur de forces de tension préalable serait détruit . Compte tenu du problème posé, l'invention concerne un contrôleur de forces de tension d'organes allongés, tels que des sangles de ceinture de sécurité, qui constitue une solution simple, précise et peu coûteuse. Cette solution comprend l'utilisation d'un organe d'appui supplémentaire muni d'un capteur de forces de tension préalable et qui est interchangeable avec un autre des organes d'appui du contrôleur de forces, cet organe étant séparable. De cette manière, dans une première étape, le contrôleur de forces est muni de 1 •organe comprenant le capteur de forces de tension préalable qui est utilisé pour la détermination de la force de tension préalable. Ensuite, 1 ' organe séparable muni du capteur de forces de tension préalable est retiré et remplacé par un organe géométriα_ue- ment interchangeable. De cette manière, la force de tension préalable n'est pas modifiée, et le contrôleur de forces peut encaisser les forces subies au cours des essais de collision. Plus précisément, l'invention concerne un, contrôleur de forces de tension d'organes allongés, du type qui comprend un corps délimitant un trajet non rectiligne de passage d'un organe allongé entre au moins deux organes d'appui placés d'un premier côté et au moins un organe d'appui placé du second côté, l'un des organes d'appui au moins étant muni d'un capteur de forces ayant une plage de mesure couvrant les forces subies au cours d'un essai de collision, chaque organe d'appui d'un côté au moins du trajet étant séparable du corps, si bien que le contrôleur de forces de tension peut être placé sur un organe allongé par séparation de chaque organe d'appui séparable du corps, puis par fixation de chaque organe d'appui séparable sur le corps ; selon 1 • invention, le contrôleur comporte en outre un organe d'appui supplémentaire géométriquement interchangeable avec un organe d'appui séparable, l'organe d'appui supplémentaire étant muni d'un second capteur de forces ayant une plage de mesure couvrant les forces de tension préalable de l'organe allongé, le contrôleur de forces ayant deux configurations différentes selon qu'un organe d'appui séparable du corps comporte le second capteur de forces ou non. Dans un mode de réalisation avantageux, le corps comporte deux organes d'appui formés de deux barres placées d'un premier côté, et un seul organe d'appui placé du second côté. De préférence, les deux organes d'appui sont sépa- rables, et l'organe d'appui supplémentaire est destiné à remplacer l'un des deux organes d'appui séparables. De préférence, l'organe unique.d"appui du second côté comprend le premier capteur de forces. Dans une variante, l'un des deux organes séparables comporte le premier capteur de forces. Dans un autre mode de réalisation, l'organe d'appui supplémentaire est analogue à l'organe unique d'appui du second côté et est interchangeable avec lui. Il est alors avantageux que l'organe unique d'appui du second côté comporte le premier capteur de forces. Dans une variante, l'un des deux organes d'appui placés du premier côté comporte le premier capteur de forces. De préférence, le corps comporte deux flasques latéraux destinés à supporter les extrémités des barres des organes d" appui . De préférence, l'organe d'appui supplémentaire comporte au moins une jauge dynamométrique. De préférence, le contrôleur comporte un câble souple relié au premier capteur de forces, et un câble souple relié au second capteur de forces. L' invention concerne aussi un procédé de contrôle de forces de tension d'organes allongés, tels que des sangles de ceinture de sécurité, du type qui comprend une première étape de réglage d'une force de tension préalable de l'organe allongé avec mesure de cette force, et une seconde étape de mesure d'une force de tension d'essai de collision appliquée à l'organe allongé au cours d'un essai de collision ; selon l'invention, les première et seconde étapes sont exécutées par disposition sur l'organe allongé d'un contrôleur de forces selon l'un des paragraphes précédents, et le procédé comporte, entre la première et la seconde étape, une étape supplémentaire de transformation du contrôleur de forces par extraction de 1 'organe supplémentaire d'appui muni du capteur de forces de tension préalable, et de remplacement par un organe d'appui séparable interchangeable avec lui. D'autres caractéristiques et avantages de l'invention seront mieux compris à la lecture de la description qui va suivre, faite en référence au dessin annexé sur lequel : la figure 1, déjà décrite, est une vue- schématique en élévation latérale d'un contrôleur de forces ; la figure 2 est une vue en plan du contrôleur de forces de la figure 1 ; et la figure 3 est une vue en élévation latérale en coupe d'une variante de contrôleur de forces qui peut être réalisé selon 1 ' invention. L'invention peut être mise en oeuvre avec le contrôleur de forces représenté sur les figures 1 et 2, muni d'un organe supplémentaire. Dans un premier mode de réalisation, les deux barres 14 constituent des organes d'appui séparables, placés d'un premier côté de la sangle 16 et qui sont formés de tiges métalliques pleines qui peuvent être vissées dans l'un des flasques du corps. L'organe 16 placé de l'autre côté est muni d'un capteur de forces d'essais de collision, c'est-à- dire pouvant subir des forces pouvant atteindre 15, 20 ou 25 kN ou plus. Pour que le contrôleur de forces puisse être utilisé selon 1 ' invention, il comporte en outre une barre supplémentaire 14 formant un organe d'appui interchangeable avec l'une des barres 14, ayant des dimensions externes iden- tiques à celles des barres 14 et de préférence des propriétés mécaniques identiques. Cependant, cet organe d'appui supplémentaire est muni d'un capteur de forces ayant une plage de mesure couvrant les forces de tension préalable, par exemple comprises entre quelques newtons et 1 kN. Dans une première étape, le contrôleur de forces est monté sur la sangle 18, et les barres utilisées sont d'une part une barre normale 14 et d'autre part la barre supplémentaire ayant le second capteur de forces. De cette manière, par connexion du câble de mesure de la barre supplémentaire à un appareil de mesure, la sangle peut être mise à la tension préalable voulue. Une fois cette valeur obtenue, dans une seconde étape, l'organe supplémentaire d' appui ayant le second capteur de forces est retiré et est remplacé par une barre pleine interchangeable démunie de second capteur. Etant donné l'interchangeabilité géométrique des deux organes, la sangle est soumise à la même tension préalable. L'essai de collision peut alors être exécuté, et les valeurs sont mesurées avec le capteur de l'organe d'appui opposé 16. La figure 3 représente une variante de contrôleur de forces dans laquelle deux barres 22 sont placées d'un premier côté de la sangle 18 et un capteur 24 des forces d'essais de collision est placé dans un organe d'appui de l'autre côté d'un corps 20. La partie centrale du corps 20 a avantageusement une forme qui permet l'optimisation des mesures par le capteur 24 des forces d'essais de collision. Dans ce mode de réalisation, l'une des deux barres 22 est constituée, dans une première étape, par une barre munie d'un second capteur de forces de tension préalable et, dans une seconde étape, par une barre pleine sans capteur. On a décrit des modes de réalisation de contrôleur de forces dans lesquels le premier capteur de forces est associé à un organe unique d'appui placé d'un second côté de la sangle, alors que deux organes séparables d'appui non munis de capteur ou munis d'un capteur de forces de tension préalable sont placés de 1 ' autre côté et sont séparables . Dans une variante, c'est l'organe d'appui unique 16 qui est séparable et, dans la première étape, il comporte un capteur de forces de tension préalable, et, dans la seconde étape, il comporte un capteur de forces d'essai de collision. Dans une autre variante, dans la première étape, c'est l'une des barres 22 qui comprend le second capteur de forces de tension préalable et, dans la seconde étape, elle est remplacée par une autre barre munie du premier capteur de forces d'essais de collision. Dans une autre variante, le premier capteur de forces peut être solidaire de l'une des deux barres qui ne sont pas séparables, et le second capteur de forces est solidaire de 1 • organe d' appui unique qui est séparable. L'invention concerne aussi un procédé de contrôle de force pour essais de collision dans lequel un même contrôleur de forces selon 1 ' invention est utilisé dans une pre- mière étape avec un organe séparable d'appui muni d'un second capteur de forces de tension préalable, et dans une seconde étape, dans laquelle des forces d'essais de collision sont mesurées, avec un premier capteur de forces solidaire d'un organe séparable ou non. Bien qu'on ait décrit l'invention en référence à une sangle de ceinture de sécurité, elle s'applique à d'autres organes allongés ayant par exemple une section circulaire ou ovale ou autre. Il est alors préférable que les organes d' appui aient une forme adaptée à la section de 1 'organe allongé utilisé. Bien entendu, diverses modifications peuvent être apportées par l'homme de l'art aux contrôleurs et procédés qui viennent d'être décrits uniquement à titre d'exemple non limitatif sans sortir du cadre de l'invention. The invention relates to a tension force controller for elongated members, such as seat belt straps, and a method for monitoring. control of tension forces of such organs. Seat belt force controllers are already known. They are generally used in crash tests to determine the properties of seat belts. Figures 1 and 2 show an example of a force controller for a strap of this type. As shown in FIG. 1, a controller body comprises two flanges 12 which support two support members or parallel bars 14, shown with a cylindrical section, and an opposite support member 16. The support members delimit between them a path through which passes a seat belt 18. The path between the two bars 14 placed on one side and the member 16 placed on the other side is slightly sinuous so that, when a tensile force is exerted on the strap, a transverse component is applied on one side to the bars 14 and on the other side to the support member 16. The controller, in the embodiment shown in FIGS. 1 and 2, comprises a sensor for forces incorporated in the support member 16. This sensor is connected to a measuring device by a cable or by a wireless link. The measurement range of this sensor covers the values of the forces experienced during a crash test. In the different types of crash tests, the forces applied must be able to reach at least 10 N or 20 kN and even more. When using such a sensor, the bars 14, which can be separated from the flanges 12 by unscrewing, are removed, the body is placed on the strap, and the bars are returned to position. The friction existing between the two bars and the support member prevents the force controller from moving along the strap 18 even when it is not horizontal. Such a force sensor is satisfactory in tests for monitoring the resistance of the seat belt straps according to the usual standards. We have now realized that it was desirable to be able to carry out the crash tests after the strap had been tensioned beforehand. For example, for the attachment of certain accessories, such as child seats, it is desirable that the strap is subjected to a prior tensile force of 50 N. In such a test, it is therefore necessary, in a first step, adjust the pre-tension of the strap to a determined value, by measuring this value, then, in the subsequent crash test, measure the forces applied to the strap. It was realized that the force sensors used in the force controllers described with reference to FIGS. 1 and 2 did not have sufficient precision in the range of low values, and therefore did not allow the tests to be carried out. above without the use of an additional device. It has therefore been envisaged to replace the force sensor used by a sensor having greater precision in a range covering the low force values. We then realized that a force controller fitted with such a sensor was very heavy. For example, while the force controller represented in FIGS. 1 and 2 has a weight of 65 g, a controller comprising a force sensor sufficiently precise for the measurement of the forces of prior tension must have a weight of 1 * order of 300 g. In a crash test, the acceleration forces applied to the force controller are considerable. A light weight force controller, such as that shown in FIGS. 1 and 2, does not excessively disturb the measurements during a crash test, while a force sensor of 300 g disturbs them considerably because it is subjected to considerable efforts. One could also consider adding to the force controller a sensor of prior tension forces, of sufficient precision, for example in one of the bars 14. However, in such an embodiment, on each collision test, the prior tension force sensor would be destroyed. Given the problem posed, the invention relates to a tension force controller of elongated members, such as seat belt straps, which is a simple, precise and inexpensive solution. This solution includes the use of an additional support member provided with a prior tension force sensor and which is interchangeable with another of the support members of the force controller, this member being separable. In this way, in a first step, the force controller is provided with a member comprising the sensor of pre-tension forces which is used for determining the pre-tension force. Then, the separable member provided with the prior tension force sensor is removed and replaced by a geometrically interchangeable member. In this way, the pre-tension force is not changed, and the force controller can absorb the forces experienced during the crash tests. More specifically, the invention relates to a controller of tension forces of elongated members, of the type which comprises a body delimiting a non-rectilinear path for the passage of an elongated member between at least two support members placed in a first side and at least one support member placed on the second side, at least one of the support members being provided with a force sensor having a measuring range covering the forces undergone during a crash test, each support member on at least one side of the path being separable from the body, so that the tension force controller can be placed on an elongate member by separating each support member separable from the body, then by fixing each separable support member on the body; according to 1 • invention, the controller further comprises an additional support member geometrically interchangeable with a separable support member, the member additional support being provided with a second force sensor having a measuring range covering the prior tension forces of the elongated member, the force controller having two different configurations depending on whether a support member separable from the body comprises the second force sensor or not. In an advantageous embodiment, the body comprises two support members formed by two bars placed on a first side, and a single support member placed on the second side. Preferably, the two support members are separable, and the additional support member is intended to replace one of the two separable support members. Preferably, the single member supporting the second side comprises the first force sensor. In one variant, one of the two separable members comprises the first force sensor. In another embodiment, the member the additional support is analogous to and interchangeable with the single support member on the second side. It is therefore advantageous for the single support member on the second side to include the first force sensor. one of the two support members placed on the first side comprises the first force sensor. Preferably, the body comprises two lateral flanges intended to support the ends of the bars of the support members. Preferably, the additional support member comprises at least one dynamometric gauge. Preferably, the controller comprises a flexible cable connected to the first force sensor, and a flexible cable connected to the second force sensor. The invention also relates to a method for controlling the tension forces of elongated members, such as seat belt straps, of the type which comprises a first step of adjusting a prior tension force of the elongated member with measurement. of this force, and a second step of measuring a collision test tension force applied to the elongated member during a test of collision; according to the invention, the first and second steps are carried out by arrangement on the elongated member of a force controller according to one of the preceding paragraphs, and the method comprises, between the first and the second step, an additional step of transformation of the force controller by extraction of the additional support member provided with the prior tension force sensor, and replacement by a separable support member interchangeable with it. Other characteristics and advantages of the invention will be better understood on reading the description which follows, made with reference to the appended drawing in which: FIG. 1, already described, is a schematic view in side elevation of a force controller; Figure 2 is a plan view of the force controller of Figure 1; and FIG. 3 is a side elevation view in section of an alternative force controller which can be produced according to the invention. The invention can be implemented with the force controller shown in Figures 1 and 2, provided with an additional member. In a first embodiment, the two bars 14 constitute separable support members, placed on a first side of the strap 16 and which are formed of solid metal rods which can be screwed into one of the flanges of the body. The member 16 placed on the other side is provided with a collision test force sensor, that is to say which can undergo forces up to 15, 20 or 25 kN or more. So that the force controller can be used according to the invention, it further comprises an additional bar 14 forming a support member interchangeable with one of the bars 14, having external dimensions identical to those of the bars 14 and preferably identical mechanical properties. However, this additional support member is provided with a force sensor having a measuring range covering the prior tension forces, for example between a few newtons and 1 kN. In a first step, the force controller is mounted on the strap 18, and the bars used are on the one hand a normal bar 14 and on the other hand the additional bar having the second force sensor. In this way, by connecting the measuring cable of the additional bar to a measuring device, the strap can be brought to the desired pre-tension. Once this value has been obtained, in a second step, the additional support member having the second force sensor is removed and is replaced by an interchangeable solid bar lacking a second sensor. Given the geometrical interchangeability of the two organs, the strap is subjected to the same preliminary tension. The collision test can then be carried out, and the values are measured with the sensor of the opposite support member 16. FIG. 3 represents a variant of force controller in which two bars 22 are placed on one side of the strap 18 and a sensor 24 of the crash test forces is placed in a support member on the other side of a body 20. The central part of the body 20 advantageously has a shape which allows the optimization of the measurements by the sensor 24 of the collision test forces. In this embodiment, one of the two bars 22 is constituted, in a first step, by a bar provided with a second sensor of prior tension forces and, in a second step, by a solid bar without sensor. Embodiments of force controllers have been described in which the first force sensor is associated with a single support member placed on a second side of the strap, while two separable support members not provided with a sensor or provided with a prior tension force sensor are placed on the other side and are separable. In a variant, it is the single support member 16 which is separable and, in the first step, it comprises a sensor of prior tension forces, and, in the second step, it includes a collision test force sensor. In another variant, in the first step, it is one of the bars 22 which includes the second sensor of forces of prior tension and, in the second step, it is replaced by another bar provided with the first sensor of forces d crash tests. In another variant, the first force sensor can be secured to one of the two bars which are not separable, and the second force sensor is secured to the single support member which is separable. The invention also relates to a force control method for crash tests in which the same force controller according to the invention is used in a first step with a separable support member provided with a second force sensor. prior tension, and in a second step, in which collision test forces are measured, with a first force sensor secured to a separable member or not. Although the invention has been described with reference to a seat belt strap, it applies to other elongated members having for example a circular or oval or other section. It is then preferable for the support members to have a shape adapted to the section of the elongated member used. Of course, various modifications can be made by those skilled in the art to the controllers and methods which have just been described solely by way of nonlimiting example without departing from the scope of the invention.

Claims

REVENDICATIONS 1. Contrôleur de forces de tension d'organes allongés soumis à des essais de collision, du type qui comprend : un corps délimitant un trajet non rectiligne de passage d'organe allongé (18) entre au moins deux organes d'appui (14 ; 22) placés d'un premier côté et au moins un organe d'appui (16) placé du second côté, l'un des organes d'appui au moins (14, 16 ; 22) étant muni d'un capteur de forces ayant une plage de mesure couvrant les forces subies au cours d'un essai de collision, chaque organe d'appui (14 ;22) d'un côté au moins du trajet étant séparable du corps, si bien que le contrôleur de forces de tension peut être placé sur un organe allongéCLAIMS 1. Controller of tensile forces of elongated members subjected to collision tests, of the type which comprises: a body delimiting a non-rectilinear path of passage of elongated member (18) between at least two support members (14 ; 22) placed on a first side and at least one support member (16) placed on the second side, at least one of the support members (14, 16; 22) being provided with a force sensor having a measuring range covering the forces undergone during a crash test, each support member (14; 22) on at least one side of the path being separable from the body, so that the tension force controller can be placed on an elongated organ
(18) par séparation de chaque organe d'appui (14 ; 22) séparable du corps, puis par fixation de chaque organe d'appui séparable (14 ; 22) sur le corps, caractérisé en ce qu'il comporte en outre un organe d' appui supplémentaire géométriquement interchangeable avec un organe d'appui séparable (14 ; 22), l'organe d'appui supplémentaire étant muni d'un second capteur de forces ayant une plage de mesure couvrant les forces de tension préalable de l'organe allongé, le contrôleur de forces ayant deux configurations différentes selon qu'un organe d'appui séparable du corps comporte le second capteur de forces ou non. (18) by separating each support member (14; 22) separable from the body, then by fixing each separable support member (14; 22) on the body, characterized in that it further comprises a member additional support geometrically interchangeable with a separable support member (14; 22), the additional support member being provided with a second force sensor having a measuring range covering the prior tension forces of the member elongated, the force controller having two different configurations depending on whether a support member separable from the body comprises the second force sensor or not.
2. Contrôleur selon la revendication 1, caractérisé en ce qu'il comporte deux organes d'appui formés de deux barres (14 ; 22), placés d'un premier côté, et un seul organe d'appui placé du second côté. 2. Controller according to claim 1, characterized in that it comprises two support members formed by two bars (14; 22), placed on a first side, and a single support member placed on the second side.
3. Contrôleur selon la revendication 2, caractérisé en ce que les deux organes d'appui (14 ; 22) sont séparables, et l'organe d'appui supplémentaire (16) est destiné à remplacer l'un des deux organes d'appui séparables. 3. Controller according to claim 2, characterized in that the two support members (14; 22) are separable, and the additional support member (16) is intended to replace one of the two support members separable.
4. Contrôleur selon la revendication 3, caractérisé en ce que l'organe unique d'appui (16) du second côté comprend le premier capteur de forces. 4. Controller according to claim 3, characterized in that the single support member (16) on the second side comprises the first force sensor.
5. Contrôleur selon la revendication 3, caractérisé en ce que l'un des deux organes séparables comporte le premier capteur de forces. 5. Controller according to claim 3, characterized in that one of the two separable members comprises the first force sensor.
6. Contrôleur selon la revendication 2, caractérisé en ce que l'organe d'appui supplémentaire est analogue à6. Controller according to claim 2, characterized in that the additional support member is similar to
1 ' organe unique d' appui du second côté et est interchangeable avec lui. 1 single support member on the second side and is interchangeable with it.
7. Contrôleur selon la revendication 6, caractérisé en ce que l'organe unique d'appui du second côté comporte le premier capteur de forces. 7. Controller according to claim 6, characterized in that the single support member on the second side comprises the first force sensor.
8. Contrôleur selon l'une quelconque des revendications précédentes, caractérisé en ce que le corps comporte deux flasques latéraux (12) destinés à supporter les extrémités des barres des organes d'appui. 8. Controller according to any one of the preceding claims, characterized in that the body comprises two lateral flanges (12) intended to support the ends of the bars of the support members.
9. Contrôleur selon l'une quelconque des revendications précédentes, caractérisé en ce que l'organe d'appui supplémentaire comporte au moins une jauge dynamométrique. 9. Controller according to any one of the preceding claims, characterized in that the additional support member comprises at least one dynamometric gauge.
10. Procédé de contrôle de forces de tension d'organes allongés, du type dans qui comprend : une première étape de réglage d'une force de tension préalable d'un organe allongé avec mesure de cette force, et une seconde étape de mesure d'une force de tension d'essai de collision appliquée à l'organe allongé au cours d'un essai de collision, caractérisé en ce que les première et seconde étapes sont exécutées par disposition sur l'organe allongé d'un contrôleur de forces selon l'une quelconque des revendications précédentes, et le procédé comporte, entre la première et la seconde étape, une étape supplémentaire de transformation du contrôleur de forces par extraction de l'organe supplémentaire d'appui muni du capteur de forces de tension préalable, et de remplacement par un organe d'appui séparable interchangeable avec lui. 10. A method of controlling the tension forces of elongated members, of the type in which comprises: a first step for adjusting a prior tension force of an elongated member with measurement of this force, and a second step for measuring '' a collision test tension force applied to the elongated member during a collision test, characterized in that the first and second steps are carried out by arrangement of a force controller according to the elongated member any one of the preceding claims, and the method comprises, between the first and the second step, an additional step of transformation of the force controller by extraction of the additional support member provided with the prior tension force sensor, and replacement by a separable support member interchangeable with it.
EP05763715A 2004-05-04 2005-05-02 Device for controlling working stresses of elongated members, in particular safety belts and control method Withdrawn EP1743154A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0404766A FR2869990B1 (en) 2004-05-04 2004-05-04 CONTROLLER OF ELONGATE BODY VOLTAGE FORCES, IN PARTICULAR SAFETY BELTS, AND METHOD OF CONTROLLING THE SAME
PCT/FR2005/001094 WO2005121734A1 (en) 2004-05-04 2005-05-02 Device for controlling working stresses of elongated members, in particular safety belts and control method

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EP (1) EP1743154A1 (en)
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WO2005121734A1 (en) 2005-12-22
FR2869990A1 (en) 2005-11-11
US20080028864A1 (en) 2008-02-07

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