FR2666371A2 - Safety device for motorised roller shutter - Google Patents

Safety device for motorised roller shutter Download PDF

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Publication number
FR2666371A2
FR2666371A2 FR9010936A FR9010936A FR2666371A2 FR 2666371 A2 FR2666371 A2 FR 2666371A2 FR 9010936 A FR9010936 A FR 9010936A FR 9010936 A FR9010936 A FR 9010936A FR 2666371 A2 FR2666371 A2 FR 2666371A2
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FR
France
Prior art keywords
average
last
values
learning mode
samples
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
FR9010936A
Other languages
French (fr)
Other versions
FR2666371B2 (en
Inventor
Orsat Jean-Michel
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.)
Somfy SA
Original Assignee
Somfy SA
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
Priority to FR9010936A priority Critical patent/FR2666371B2/en
Application filed by Somfy SA filed Critical Somfy SA
Priority to AT91810022T priority patent/ATE103368T1/en
Priority to DE69101450T priority patent/DE69101450T2/en
Priority to EP91810022A priority patent/EP0439422B1/en
Priority to ES91810022T priority patent/ES2053307T3/en
Priority to US07/644,543 priority patent/US5198974A/en
Priority to JP3091798A priority patent/JPH0754563A/en
Publication of FR2666371A2 publication Critical patent/FR2666371A2/en
Application granted granted Critical
Publication of FR2666371B2 publication Critical patent/FR2666371B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/68—Operating devices or mechanisms, e.g. with electric drive
    • E06B9/70—Operating devices or mechanisms, e.g. with electric drive comprising an electric motor positioned outside the roller
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/80—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling
    • E06B9/82—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic
    • E06B9/84—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic against dropping
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/80—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling
    • E06B9/82—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic
    • E06B9/88—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic for limiting unrolling
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/68—Operating devices or mechanisms, e.g. with electric drive
    • E06B2009/6809—Control
    • E06B2009/6818—Control using sensors
    • E06B2009/6836—Control using sensors sensing obstacle
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/68—Operating devices or mechanisms, e.g. with electric drive
    • E06B2009/6809—Control
    • E06B2009/6818—Control using sensors
    • E06B2009/6845—Control using sensors sensing position
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/68—Operating devices or mechanisms, e.g. with electric drive
    • E06B2009/6809—Control
    • E06B2009/6818—Control using sensors
    • E06B2009/6854—Control using sensors sensing torque

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)

Abstract

The invention relates to a safety device for motorised roller shutters. The program of the logic processing unit comprises additional instructions (64, 65) for calculating the mean value of the last n speed sample values stored in memory, in the learning mode and in the use mode. In the use mode, this mean value is compared to the mean value of the last n values of the samples of signal calculated in the learning mode in order to activate the sub-program for stopping the motor and raising the shutter when the difference between the values compared is greater than a given value. This improvement enables the detection of thin obstacles starting from the bottom stop point.

Description

Dans la demande de brevet principal est décrit un dispositif de sécurité pour volet roulant motorisé comprenant un générateur de signal engendrant un signal représentatif du déplacement du volet roulant et une unité logique de traitement apte à travailler en mode apprentissage et en mode utilisation pour enregistrer et traiter des échantillons de signal et comparer les valeurs obtenues en mode utilisation aux valeurs obtenues en mode apprentissage pour commander l'arrêt du moteur et la remontée du volet roulant. Dans certaines formes d'exécution, l'unité logique de traitement est en outre programmée pour assurer l'arrêt automatique du volet roulant en position basse. En l'absence de cette fonction supplémentaire, l'arrêt automatique du volet roulant est assuré par un mécanisme entraîné avec le tube d'enroulement et actionnant un interrupteur de fin de course.In the main patent application, a safety device for a motorized roller shutter is described comprising a signal generator generating a signal representative of the movement of the roller shutter and a logic processing unit capable of working in learning mode and in use mode for recording and processing. signal samples and compare the values obtained in use mode with the values obtained in learning mode to control the shutdown of the motor and the raising of the shutter. In certain embodiments, the logic processing unit is also programmed to ensure the automatic shutdown of the shutter in the low position. In the absence of this additional function, the automatic shutdown of the roller shutter is ensured by a mechanism driven with the winding tube and actuating a limit switch.

Dans les deux cas, il n'est pas possible de distinguer un obstacle du point d'arrêt bas, si cet obstacle est près du point d'arrêt bas et occupe une hauteur inférieure à 20 mm à compter du point d'arrêt bas. Dès lors, dans le cas où l'arrêt automatique au point d'arrêt bas est assuré par un dispositif mécanique, un tel petit obstacle est ignoré. C'est notamment le cas d'un volet roulant où le programme de sécurité teste que la vitesse en mode utilisation est égale à la vitesse en mode apprentissage lorsque la première lame du volet roulant bute sur l'embase. Le dispositif d'arrêt en fin de course n'assurera l'arrêt du moteur que lorsque toutes les lames du volet roulant se seront empilées les unes sur les autres. Si le petit obstacle ignoré est, par exemple un doigt, notamment un doigt d'enfant, ce doigt peut être coincé par le volet roulant.Si l'arrêt au point bas est assuré par l'unité logique de traitement, l'arrêt au point bas se fera trop tôt et le volet roulant ne sera pas complètement fermé.In both cases, it is not possible to distinguish an obstacle from the low breakpoint, if this obstacle is near the low breakpoint and occupies a height of less than 20 mm from the low breakpoint. Therefore, in the case where the automatic stopping at the bottom stopping point is ensured by a mechanical device, such a small obstacle is ignored. This is particularly the case of a rolling shutter where the safety program tests that the speed in use mode is equal to the speed in learning mode when the first blade of the rolling shutter comes up against the base. The end-of-travel stop device will only stop the motor when all the shutter blades are stacked on top of each other. If the small obstacle ignored is, for example a finger, in particular a child's finger, this finger can be trapped by the roller shutter. If the stop at the low point is ensured by the logic processing unit, the stop at low point will be too early and the roller shutter will not be completely closed.

La présente addition a pour but d'obvier à cet inconvénient.The purpose of this addition is to obviate this drawback.

Selon cette addition, l'unité logique de traitement est en outre programmée pour, en mode apprentissage, tant que le pente élémentaire de la courbe des échantillons est égale à zéro ou lorsque la valeur des échantillons est égale à zéro, selon le mode d'exécution, calculer la moyenne des n dernières valeurs d'échantillons mémorisées et, en mode utilisation, lorsque l'écart entre la pente élémentaire entre les échantillons de signal et la pente moyenne calculée en mode apprentissage est supérieur à une valeur déterminée ou lorsque la valeur de l'échantillon est voisine de zéro, selon le mode d'exécution, calculer la moyenne des n dernières valeurs d'échantillons mémorisées et comparer cette moyenne à la moyenne des n dernières valeurs des échantillons de signal calculée en mode apprentissage et activer le sous-programme d'arrêt du moteur et de remontée lorsque l'écart entre les valeurs comparées est supérieur à une valeur déterminée.According to this addition, the logic processing unit is also programmed for, in learning mode, as long as the elementary slope of the curve of the samples is equal to zero or when the value of the samples is equal to zero, depending on the mode of execution, calculate the average of the last n stored sample values and, in use mode, when the difference between the elementary slope between the signal samples and the average slope calculated in learning mode is greater than a determined value or when the value of the sample is close to zero, depending on the execution mode, calculate the average of the last n stored sample values and compare this average with the average of the last n values of the signal samples calculated in learning mode and activate the sub - engine stop and ascent program when the difference between the compared values is greater than a determined value.

En pratique, n sera choisi égal à environ 20 et l'écart critique sera choisi à environ 10% de la valeur moyenne calculée en mode apprentissage.In practice, n will be chosen equal to approximately 20 and the critical deviation will be chosen to be approximately 10% of the average value calculated in learning mode.

Ce perfectionnement du programme permet de détecter des obstacles occupant une hauteur d'environ 5 mm à compter du point d'arrêt bas. Un volet roulant rencontrant un doigt s'arrêtera et remontera. This refinement of the program makes it possible to detect obstacles occupying a height of approximately 5 mm from the bottom stopping point. A roller shutter meeting a finger will stop and go up.

Le dessin annexé représente, à titre d'exemple, trois modes d'exécution de l'invention.The accompanying drawing shows, by way of example, three embodiments of the invention.

Les figures 1, 2 et 3 représentent respectivement les diagrammes des instructions du programme de sécurité selon une première, une deuxième et une troisième formes d'exécution.FIGS. 1, 2 and 3 respectively represent the diagrams of the instructions of the security program according to a first, a second and a third embodiment.

Le diagramme représenté à la figure 1 correspond au diagramme représenté à la figure 5 de la demande de brevet principal, auquel ont été ajoutées les instructions 64 et 65. L'instruction 64, entre l'instruction de test 38 et l'instruction 40, est une instruction de calcul de la valeur moyenne (VMAP) des n dernières valeurs lues en mode apprentissage et mémorisées en 39.The diagram represented in FIG. 1 corresponds to the diagram represented in FIG. 5 of the main patent application, to which instructions 64 and 65 have been added. Instruction 64, between test instruction 38 and instruction 40, is an instruction for calculating the average value (VMAP) of the last n values read in learning mode and stored in 39.

L'instruction 65, disposée entre l'instruction de test 45 et l'instruction 47', est une instruction de calcul de la valeur moyenne (VMUT) des n dernières valeurs lues en mode utilisation et mémorisées en 46.Instruction 65, placed between test instruction 45 and instruction 47 ′, is an instruction for calculating the average value (VMUT) of the n last values read in use mode and stored in 46.

L'instruction 47 de la demande de brevet principal est devenue instruction 47' car, dans ce nouveau mode d'exécution, c'est une instruction de comparaison de la dernière moyenne VMUT calculée avec la dernière moyenne
VMAP mémorisée. Par conséquent, l'instruction 48 teste si VMUT ~~ VMAP. Instruction 47 of the main patent application has become instruction 47 'because, in this new mode of execution, it is an instruction for comparing the last average VMUT calculated with the last average
VMAP stored. Therefore, instruction 48 tests whether VMUT ~~ VMAP.

En pratique, n - 20 et l'instruction 48 détecte VMUT =
VMAP pour VMUT - à 0,9 VMAP.In practice, n - 20 and instruction 48 detects VMUT =
VMAP for VMUT - at 0.9 VMAP.

Si 1'instruction 48 détecte VMUT f VMAP, c'est-à-dire
VMUT C 0,9 VMAP, l'instruction 48 appelle l'instruction 49 qui active le sous-programme d'arrêt et de remontée du volet roulant. If instruction 48 detects VMUT f VMAP, that is to say
VMUT C 0.9 VMAP, instruction 48 calls instruction 49 which activates the shutter stop and up subroutine.

L'unité logique de traitement peut bien entendu être, de plus, programmée pour assurer des fonctions supplémentaires, comme décrit dans la demande de brevet principal.The logical processing unit can of course also be programmed to perform additional functions, as described in the main patent application.

La figure 2 représente le diagramme d'instruction de la figure 10 de la demande de brevet principal complétée par les mêmes instructions 64 et 65. L'instruction 64 est disposée entre l'instruction de test 38' et l'instruction 42. L'instruction 65 est disposée entre l'instruction de test 45' et l'instruction 47' identique à l'instruction 47' de la figure 1. FIG. 2 represents the instruction diagram of FIG. 10 of the main patent application supplemented by the same instructions 64 and 65. The instruction 64 is arranged between the test instruction 38 'and the instruction 42. The instruction 65 is placed between test instruction 45 'and instruction 47' identical to instruction 47 'in FIG. 1.

Le diagramme représenté à la figure 3 correspond au diagramme représenté à la figure 14 de la demande de brevet principal complété par les mêmes instructions 64 et 65. L'instruction 64 est disposée entre l'instruction de test 48' et l'instruction 40. L'instruction 65 est disposée entre l'instruction de test 45 et l'instruction 47' identique à l'instruction 47' de la figure 1. The diagram represented in FIG. 3 corresponds to the diagram represented in FIG. 14 of the main patent application supplemented by the same instructions 64 and 65. The instruction 64 is arranged between the test instruction 48 ′ and the instruction 40. The instruction 65 is placed between the test instruction 45 and the instruction 47 'identical to the instruction 47' of FIG. 1.

Claims (3)

REVENDICATIONS.CLAIMS. 1. Dispositif de sécurité pour volet roulant ou similaire selon la revendication 4 de la demande de brevet principal, caractérisé en ce que l'unité logique de traitement est en outre programmée pour, en mode apprentissage, lorsque la pente élémentaire de la courbe des échantillons est égale à zéro, calculer la moyenne des n dernières valeurs d'échantillons mémorisées avant de calculer la pente moyenne entre le premier et le dernier échantillon de signal, et, en mode utilisation, lorsque l'écart entre la pente élémentaire entre les échantillons de signal et la pente moyenne calculée en mode apprentissage est supérieur à une valeur déterminée, calculer la moyenne des n dernières valeurs d'échantillons de signal mémorisées, puis comparer cette moyenne à la moyenne des n dernières valeurs des échantillons de signal calculée en mode apprentissage et activer le sous-programme d'arrêt du moteur et de remontée lorsque l'écart entre les valeurs comparées est supérieur à une valeur déterminée.1. Safety device for a rolling shutter or the like according to claim 4 of the main patent application, characterized in that the logic processing unit is also programmed for, in learning mode, when the elementary slope of the curve of the samples is equal to zero, calculate the average of the last n stored sample values before calculating the average slope between the first and the last signal sample, and, in use mode, when the difference between the elementary slope between the samples of signal and the average slope calculated in learning mode is greater than a determined value, calculate the average of the last n values of stored signal samples, then compare this average with the average of the last n values of signal samples calculated in learning mode and activate the engine shutdown and ascent routine when the difference between the compared values is t greater than a determined value. 2. Dispositif de sécurité selon la revendication 9 de la demande de brevet principal, caractérisé en ce que l'unité logique de traitement est en outre programmée pour, en mode apprentissage, lorsque la valeur des échantillons est égale à zéro, calculer la moyenne des n dernières valeurs d'échantillons mémorisées et, en mode utilisation, lorsque la valeur de l'échantillon est voisine de zéro, calculer la moyenne des n dernières valeurs d'échantillons mémorisées, puis comparer cette moyenne à la moyenne des n dernières valeurs des échantillons de signal calculée en mode apprentissage et activer le sous-programme d'arrêt du moteur et de remontée lorsque l'écart entre les valeurs comparées est supérieur à une valeur déterminée. 2. Security device according to claim 9 of the main patent application, characterized in that the logic processing unit is also programmed to, in learning mode, when the value of the samples is equal to zero, calculate the average of n last stored sample values and, in use mode, when the sample value is close to zero, calculate the average of the last n stored sample values, then compare this average with the average of the last n sample values signal calculated in learning mode and activate the engine shutdown and ascent routine when the difference between the compared values is greater than a determined value. 3. Dispositif de sécurité selon la revendication 13 de la demande de brevet principal, caractérisé en ce que l'unité logique de traitement est en outre programmée pour, en mode apprentissage, lorsque la valeur des échantillons est égale à zéro, calculer la moyenne des n dernières valeurs d'échantillons mémorisées et, en mode utilisation, lorsque l'écart entre la pente élémentaire entre les échantillons de signal et la pente moyenne calculée en mode apprentissage est supérieur à une valeur déterminée, calculer la moyenne des n dernières valeurs d'échantillons de signal mémorisées, puis comparer cette moyenne à la moyenne des n dernières valeurs des échantillons de signal calculée en mode apprentissage, et activer le sous-programme d'arrêt du moteur et de remontée lorsque l'écart entre les valeurs comparées est supérieur à une valeur déterminée.  3. Security device according to claim 13 of the main patent application, characterized in that the logic processing unit is also programmed to, in learning mode, when the value of the samples is equal to zero, calculate the average of n last stored sample values and, in use mode, when the difference between the elementary slope between the signal samples and the average slope calculated in learning mode is greater than a determined value, calculate the average of the n last values of memorized signal samples, then compare this average with the average of the last n values of the signal samples calculated in learning mode, and activate the engine stop and ascent routine when the difference between the compared values is greater than a determined value.
FR9010936A 1990-01-26 1990-09-03 SECURITY DEVICE FOR MOTORIZED ROLLING SHUTTER. Expired - Lifetime FR2666371B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
FR9010936A FR2666371B2 (en) 1990-09-03 1990-09-03 SECURITY DEVICE FOR MOTORIZED ROLLING SHUTTER.
DE69101450T DE69101450T2 (en) 1990-01-26 1991-01-15 Safety device for motorized roller shutters.
EP91810022A EP0439422B1 (en) 1990-01-26 1991-01-15 Safety mechanism for motorised roller shutters
ES91810022T ES2053307T3 (en) 1990-01-26 1991-01-15 SAFETY DEVICE FOR MOTORIZED ROLLING SHUTTER.
AT91810022T ATE103368T1 (en) 1990-01-26 1991-01-15 SAFETY DEVICE FOR MOTORIZED ROLLER SHUTTERS.
US07/644,543 US5198974A (en) 1990-01-26 1991-01-23 Safety device for motorized rolling shutter
JP3091798A JPH0754563A (en) 1990-01-26 1991-01-28 Safety device for electric roll shutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9010936A FR2666371B2 (en) 1990-09-03 1990-09-03 SECURITY DEVICE FOR MOTORIZED ROLLING SHUTTER.

Publications (2)

Publication Number Publication Date
FR2666371A2 true FR2666371A2 (en) 1992-03-06
FR2666371B2 FR2666371B2 (en) 1992-11-20

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Application Number Title Priority Date Filing Date
FR9010936A Expired - Lifetime FR2666371B2 (en) 1990-01-26 1990-09-03 SECURITY DEVICE FOR MOTORIZED ROLLING SHUTTER.

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Country Link
FR (1) FR2666371B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2743439A1 (en) * 2012-12-12 2014-06-18 HEIM & HAUS Holding GmbH Method for operating an electric roller blind, electrical roller blind, in particular for a roof window, controller, and roof window with such a roller blind
GB2530891A (en) * 2015-08-14 2016-04-06 Louver Lite Ltd Blind apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4831509A (en) * 1986-04-16 1989-05-16 Byrne & Davidson Doors (N.S.W.)Pty. Limited Door operation control apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4831509A (en) * 1986-04-16 1989-05-16 Byrne & Davidson Doors (N.S.W.)Pty. Limited Door operation control apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2743439A1 (en) * 2012-12-12 2014-06-18 HEIM & HAUS Holding GmbH Method for operating an electric roller blind, electrical roller blind, in particular for a roof window, controller, and roof window with such a roller blind
GB2530891A (en) * 2015-08-14 2016-04-06 Louver Lite Ltd Blind apparatus

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Publication number Publication date
FR2666371B2 (en) 1992-11-20

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