EP0628766B1 - Steam boiler with safety device - Google Patents
Steam boiler with safety device Download PDFInfo
- Publication number
- EP0628766B1 EP0628766B1 EP19940401288 EP94401288A EP0628766B1 EP 0628766 B1 EP0628766 B1 EP 0628766B1 EP 19940401288 EP19940401288 EP 19940401288 EP 94401288 A EP94401288 A EP 94401288A EP 0628766 B1 EP0628766 B1 EP 0628766B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rod
- boiler body
- boiler
- enclosure
- steam
- 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.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
- F22B1/284—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F75/00—Hand irons
- D06F75/08—Hand irons internally heated by electricity
- D06F75/10—Hand irons internally heated by electricity with means for supplying steam to the article being ironed
- D06F75/12—Hand irons internally heated by electricity with means for supplying steam to the article being ironed the steam being produced from water supplied to the iron from an external source
Definitions
- the present invention relates to a steam generating boiler, in particular for an iron, comprising a boiler body disposed inside a protective enclosure and connected to the latter by a connecting piece having a filling opening for water which opens into the boiler body and which is closed by a plug accessible from outside the enclosure; and a safety device comprising a deformable member sensitive to the vapor pressure prevailing inside the boiler body, as well as a rod transverse to the accessibility face of the enclosure and driven to slide by said deformable member for occupy either a locking position, defined when the boiler body is under pressure, in which the free end of the rod locks the plug, or an unlocking position, defined when the vapor pressure inside the boiler body has fallen below a predetermined level, in which the free end of the rod releases the plug.
- the safety device is adapted to prevent the user from opening the cap as long as the vapor pressure inside the boiler body is above a predetermined minimum value, thus protecting the user from any accident or serious burn.
- the invention therefore proposes to produce a steam production boiler, of the type described above, in which the safety device is entirely removable from the outside when the filling plug is released.
- this result is achieved thanks to the fact that the deformable member of the safety device is held in place in a hollow cylindrical sleeve which is mounted transversely and irremovably in an opening in the wall of the boiler body located opposite the accessibility face of the enclosure, and which comprises, on its part located outside the boiler body, an annular thread onto which is screwed a coaxial cylindrical part forming a cap, this cap comprising a part end which crosses said accessibility face of the enclosure and which comprises a chimney for passage of the rod.
- the reference 1 designates an enclosure or protective housing, of substantially parallelepiped shape, which is adapted to define a support base for an iron, and which contains an electric boiler 2 of production of vapor, of a structure known per se.
- the boiler 2 comprises a cylindrical sleeve 3 which extends transversely in an opening 4 formed in the upper wall 5 of the boiler, and which is fixed in a non-removable manner, for example by an annular weld bead 7, on the upper wall 5 of Boiler.
- the sleeve 3 is pierced vertically with an orifice 9, partly threaded, in which is mounted by screwing a cylindrical connecting piece 12, of vertical axis XX, having an upper part 13 surrounded by a seal 15 mounted in an opening 16 formed in the upper face 17 of the enclosure 1.
- the cylindrical connecting piece 12 has an axial opening 19 for filling with water which opens, at one of its ends, into the boiler 2 and which is closed , at its other threaded end, by a screw cap 21 having a head 22 accessible from the outside of the enclosure 1.
- the general reference 30 designates the safety device according to the invention, which extends vertically along an axis YY parallel to the axis XX, a short distance from each other.
- the safety device 30 comprises a vertical rod 32, one of the ends 32a of which is integral with a piston 34, and the other end of which 32b has the shape of a flat head projecting from the upper face 17 of the enclosure 1 and which can be inserted into a notch 36 formed in the plug 21.
- the head 32b of the rod 32 carries a seal 38.
- the rod 32 and the piston 34 are housed in a cylindrical part forming a cap 39 which has a lower part 39a screwed onto an annular thread 41 formed internally in the upper part 3a of the sleeve 3, this upper part 3a being located outside. of the boiler 2.
- the cap 39 has an upper part 39b which passes through the seal 15 and which has a vertical chimney 43 for passage of the rod 32.
- the rod 32 - piston 34 assembly is actuated by a deformable member 45 sensitive to the pressure prevailing inside the boiler 2, so as to be able to slide in the cap 39 while being guided therein.
- the member 45 is constituted by a flexible membrane, made of an elastomeric material, and having the shape of a hollow balloon of section in ⁇ which is open towards the inside of the boiler 2, and the end edge 45a of which is held in a nip area 47a formed in a ring 47 mounted coaxially in the sleeve 3 and interposed in abutment between the bottom 49 of the cap 39 and the bottom forming the shoulder 51 of the sleeve 3
- the piston 34 rests on the base of the membrane 45 in ⁇ .
- the membrane 45 in ⁇ defines an internal chamber 53 which communicates with the interior of the boiler 2 via an orifice 54 formed in the bottom 51 of the sleeve 3.
- a calibrated spring 55 is housed inside the cap 39 while being mounted in abutment between the piston 34 and the bottom 56 of the upper part 39b of the cap 39, and acts on the rod 32 - piston 34 assembly so that '' it tends to decouple the rod 32 from the notch 36 of the plug 21.
- the membrane 45 is in the "inflated" state and the head 32b of the rod 32 is engaged in the notch 36 of the plug 21, so that the plug 21 is locked in rotation.
- the fact that the membrane 45 in ⁇ is open towards the inside of the boiler 2 has the advantage that in the event of a depression occurring in the boiler when the plug 21 is unlocked, the membrane simply folds back on it. even by not being subject to any external constraint liable to damage it.
- the disassembly of the safety device 30 is easily carried out from outside the enclosure 1, the plug 21 being in the unlocked position. Indeed, after unscrewing the cap 21, it suffices to remove the seal 15 using an appropriate tool, then unscrew the cap 39 and successively extract the different parts of the device.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Textile Engineering (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Description
La présente invention concerne une chaudière de production de vapeur, notamment pour fer à repasser, comportant un corps de chaudière disposé à l'intérieur d'une enceinte de protection et relié à cette dernière par une pièce de liaison présentant une ouverture de remplissage d'eau qui débouche dans le corps de chaudière et qui est fermée par un bouchon accessible de l'extérieur de l'enceinte ; et un dispositif de sécurité comportant un organe déformable sensible à la pression de vapeur régnant à l'intérieur du corps de chaudière, ainsi qu'une tige transversale à la face d'accessibilité de l'enceinte et entraînée à coulissement par ledit organe déformable pour occuper soit une position de verrouillage, définie lorsque le corps de chaudière est sous pression, dans laquelle l'extrémité libre de la tige verrouille le bouchon, soit une position de déverrouillage, définie lorsque la pression de vapeur à l'intérieur du corps de chaudière est tombée en dessous d'un niveau prédéterminé, dans laquelle l'extrémité libre de la tige libère le bouchon.The present invention relates to a steam generating boiler, in particular for an iron, comprising a boiler body disposed inside a protective enclosure and connected to the latter by a connecting piece having a filling opening for water which opens into the boiler body and which is closed by a plug accessible from outside the enclosure; and a safety device comprising a deformable member sensitive to the vapor pressure prevailing inside the boiler body, as well as a rod transverse to the accessibility face of the enclosure and driven to slide by said deformable member for occupy either a locking position, defined when the boiler body is under pressure, in which the free end of the rod locks the plug, or an unlocking position, defined when the vapor pressure inside the boiler body has fallen below a predetermined level, in which the free end of the rod releases the plug.
Dans le domaine des fers à repasser électriques à vapeur, à usage domestique, on utilise de plus en plus pour la production importante de vapeur sous pression une chaudière électrique qui est structurellement indépendante du fer à repasser et qui reliée à l'arrière du fer par un tuyau souple d'amenée de vapeur.In the field of electric steam irons, for domestic use, an increasing number of electric boilers are used for the production of pressurized steam which is structurally independent of the iron and which is connected to the rear of the iron by a flexible steam supply pipe.
On sait qu'avec de telles chaudières équipées d'un dispositif de sécurité, telles que celle décrite dans le document FR-A-2 539 434, le dispositif de sécurité est adapté à empêcher l'utilisateur d'ouvrir le bouchon tant que la pression de vapeur à l'intérieur du corps de chaudière est supérieure à une valeur minimum prédéterminée, protégeant ainsi l'utilisateur de tout accident ou brûlure grave.It is known that with such boilers equipped with a safety device, such as that described in document FR-A-2 539 434, the safety device is adapted to prevent the user from opening the cap as long as the vapor pressure inside the boiler body is above a predetermined minimum value, thus protecting the user from any accident or serious burn.
Pour des raisons de facilité de réparation du dispositif de sécurité en cas de défaillance de ce dernier, il s'avère alors nécessaire de pouvoir démonter le dispositif de sécurité depuis l'extérieur, c'est-à-dire sans ouvrir la chaudière et sans extraire celle-ci de son enceinte de protection, lorsque la pression de vapeur à l'intérieur de la chaudière est tombée en dessous d'un niveau prédéterminé.For reasons of ease of repairing the safety device in the event of failure of the latter, it then becomes necessary to be able to dismantle the safety device from the outside, that is to say without opening the boiler and without extract it from its protective enclosure, when the vapor pressure inside the boiler has fallen below a predetermined level.
L'invention se propose, par suite, de réaliser une chaudière de production de vapeur, du type exposé ci-dessus, dans laquelle le dispositif de sécurité soit entièrement démontable de l'extérieur lorsque le bouchon de remplissage est libéré.The invention therefore proposes to produce a steam production boiler, of the type described above, in which the safety device is entirely removable from the outside when the filling plug is released.
Selon l'invention, ce résultat est atteint grâce au fait que l'organe déformable du dispositif de sécurité est maintenu en place dans un manchon cylindrique creux qui est monté transversalement et de manière inamovible dans une ouverture ménagée dans la paroi du corps de chaudière située en regard de la face d'accessibilité de l'enceinte, et qui comporte, sur sa partie située à l'extérieur du corps de chaudière, un filetage annulaire sur lequel est vissée une pièce cylindrique coaxiale formant un chapeau, ce chapeau comportant une partie d'extrémité qui traverse ladite face d'accessibilité de l'enceinte et qui comporte une cheminée de passage de la tige.According to the invention, this result is achieved thanks to the fact that the deformable member of the safety device is held in place in a hollow cylindrical sleeve which is mounted transversely and irremovably in an opening in the wall of the boiler body located opposite the accessibility face of the enclosure, and which comprises, on its part located outside the boiler body, an annular thread onto which is screwed a coaxial cylindrical part forming a cap, this cap comprising a part end which crosses said accessibility face of the enclosure and which comprises a chimney for passage of the rod.
Ainsi, un simple dévissage du chapeau permet d'extraire aisément, depuis l'extérieur de l'enceinte de protection du corps de chaudière, les diverses pièces constituant le dispositif de sécurité.Thus, a simple unscrewing of the cap makes it possible to easily extract, from the outside of the protection enclosure of the boiler body, the various parts constituting the safety device.
Les caractéristiques et avantages de l'invention ressortiront d'ailleurs de la description qui va suivre, à titre d'exemple non limitatif, en référence au dessin annexé dont la figure unique est une coupe schématique montrant en détail la structure d'un dispositif de sécurité selon l'invention.The characteristics and advantages of the invention will become apparent from the description which follows, by way of nonlimiting example, with reference to the appended drawing, the single figure of which is a schematic section showing in detail the structure of a device for security according to the invention.
Dans l'exemple de réalisation représenté sur la figure, le repère 1 désigne une enceinte ou boîtier de protection, de forme sensiblement parallélépipédique, qui est adapté pour définir une base de support pour un fer à repasser, et qui renferme une chaudière électrique 2 de production de vapeur, d'une structure connue en soi.In the embodiment shown in the figure, the reference 1 designates an enclosure or protective housing, of substantially parallelepiped shape, which is adapted to define a support base for an iron, and which contains an electric boiler 2 of production of vapor, of a structure known per se.
La chaudière 2 comporte un manchon cylindrique 3 qui s'étend transversalement dans une ouverture 4 ménagée dans la paroi supérieure 5 de la chaudière, et qui fixé de manière inamovible, par exemple par un cordon annulaire de soudure 7, sur la paroi supérieure 5 de la chaudière. Le manchon 3 est percé verticalement d'un orifice 9, en partie fileté, dans lequel est montée par vissage une pièce cylindrique de liaison 12, d'axe vertical XX, présentant une partie supérieure 13 entourée par un joint d'étanchéité 15 monté dans une ouverture 16 ménagée dans la face supérieure 17 de l'enceinte 1. La pièce cylindrique de liaison 12 comporte une ouverture axiale 19 de remplissage d'eau qui débouche, à l'une de ses extrémités, dans la chaudière 2 et qui est fermée, à son autre extrémité filetée, par un bouchon vissé 21 présentant une tête 22 accessible de l'extérieur de l'enceinte 1.The boiler 2 comprises a
Sur la figure, on a désigné par le repère général 30 le dispositif de sécurité conforme à l'invention, qui s'étend verticalement suivant un axe YY parallèle à l'axe XX, à faible distance l'un de l'autre.In the figure, the
Le dispositif de sécurité 30 comporte une tige verticale 32 dont l'une 32a des extrémités est solidaire d'un piston 34, et dont l'autre extrémité 32b présente la forme d'une tête plate faisant saillie de la face supérieure 17 de l'enceinte 1 et pouvant s'insérer dans une encoche 36 pratiquée dans le bouchon 21. De préférence, la tête 32b de la tige 32 porte un joint d'étanchéité 38.The
La tige 32 et le piston 34 sont logés dans une pièce cylindrique formant un chapeau 39 qui présente une partie inférieure 39a vissée sur un filetage annulaire 41 formé intérieurement dans la partie supérieure 3a du manchon 3, cette partie supérieure 3a étant située à l'extérieur de la chaudière 2. Le chapeau 39 présente une partie supérieure 39b qui traverse le joint d'étanchéité 15 et qui comporte une cheminée verticale 43 de passage de la tige 32.The
L'ensemble tige 32 - piston 34 est actionné par un organe déformable 45 sensible à la pression régnant à l'intérieur de la chaudière 2, de manière à pouvoir coulisser dans le chapeau 39 en y étant guidé. Dans l'exemple de réalisation illustré à la figure , l'organe 45 est constitué par une membrane souple, réalisée en un matériau élastomère, et présentant la forme d'un ballon creux de section en Ω qui est ouvert vers l'intérieur de la chaudière 2, et dont le bord d'extrémité 45a est maintenu dans une zone de pincement 47a formée dans une bague 47 montée coaxialement dans le manchon 3 et interposée en appui entre le fond 49 du chapeau 39 et le fond formant épaulement 51 du manchon 3. Le piston 34 repose sur la base de la membrane 45 en Ω.The rod 32 - piston 34 assembly is actuated by a
Comme le montre la figure, la membrane 45 en Ω définit une chambre interne 53 qui communique avec l'intérieur de la chaudière 2 via un orifice 54 ménagé dans le fond 51 du manchon 3.As shown in the figure, the
Un ressort calibré 55 est logé à l'intérieur du chapeau 39 en étant monté en appui entre le piston 34 et le fond 56 de la partie supérieure 39b du chapeau 39, et agit sur l'ensemble tige 32 - piston 34 de telle sorte qu'il tende à désaccoupler la tige 32 de l'encoche 36 du bouchon 21.A
Aussi longtemps que la pression de vapeur à l'intérieur de la chaudière 2 est supérieure à une valeur minimum prédéterminée, la membrane 45 est à l'état "gonflé" et la tête 32b de la tige 32 est engagée dans l'encoche 36 du bouchon 21, de telle sorte que le bouchon 21 est verrouillé en rotation.As long as the vapor pressure inside the boiler 2 is greater than a predetermined minimum value, the
Lorsque la pression de vapeur à l'intérieur de la chaudière 2 tombe à un niveau inférieur à une valeur prédéterminée, la membrane 45 passe à l'état "dégonflé" (représenté en traits interrompus sur la figure) et, sous l'action du ressort 55, l'ensemble tige 32 - piston 34 descend de sorte que la tête 32b de la tige 32 est dégagée de l'encoche 36 du bouchon 21, déverrouillant ainsi ce dernier. Dans cette position de déverrouillage du bouchon 21, la tête 32b de la tige 32 vient obturer de façon étanche le débouché de la cheminée 43 du chapeau 39 grâce à son joint d'étanchéité 38, comme représenté en traits interrompus sur la figure. Cette étanchéité est particulièrement avantageuse car elle permet de protéger le dispositif de sécurité 30 contre toute infiltration d'eau lors du remplissage de la chaudière 2 via l'ouverture 19, le bouchon 21 étant dévissé.When the vapor pressure inside the boiler 2 drops to a level below a predetermined value, the
Par ailleurs, le fait que la membrane 45 en Ω soit ouverte vers l'intérieur de la chaudière 2 présente l'avantage qu'en cas de dépression survenant dans la chaudière lors du déverrouillage du bouchon 21, la membrane se replie simplement sur elle-même en n'étant soumise à aucune contrainte externe susceptible de l'endommager.Furthermore, the fact that the
D'après ce qui précède, on comprend que le démontage du dispositif de sécurité 30 s'effectue aisément depuis l'extérieur de l'enceinte 1, le bouchon 21 étant en position déverrouillée. En effet, après dévissage du bouchon 21, il suffit de retirer le joint d'étanchéité 15 à l'aide d'un outil approprié, puis de dévisser le chapeau 39 et d'extraire successivement les différentes pièces du dispositif.From the above, it is understood that the disassembly of the
Claims (5)
- Steam-producing boiler, in particular for an iron, comprising a boiler body (2) disposed inside a protective enclosure (1) and connected to the latter by a connecting piece (12) having a water-filling opening (19) which opens out into the boiler body (2) and which is closed off by a plug (21) accessible from outside the enclosure ; and a safety device including a deformable member (45) sensitive to the steam pressure prevailing inside the boiler body (2), and a rod (32) transverse to the accessibility face (17) of the enclosure (1) and slidably driven by the said deformable member (45) so as to occupy either a locking position, defined when the boiler body is under pressure, in which the free end (32b) of the rod (32) locks the plug (21), or an unlocking position, defined when the steam pressure inside the boiler body has fallen below a predetermined level, in which the free end (32b) of the rod (32) releases the plug (21),
characterised in that the deformable member (45) of the safety device is held in place in a hollow cylindrical sleeve (3) which is mounted transversely an non-removably in an opening (4) formed in the wall (5) of the boiler body situated opposite the accessibility face (17) of the enclosure, and which has, on its part (3a) situated outside the boiler body (2), an annular thread (41) onto which there is screwed a coaxial cylindrical piece forming a cap (39), this cap having an end part (39b) which passes through the said accessibility face (17) of the enclosure and which includes a shaft (43) for the rod (32) to pass. - Steam-producing boiler according to claim 1,
characterised in that the free end (32b) of the rod (32) of the safety device has the shape of a flat head which comes to be inserted in a recess (36) provided in the plug (21) when the rod (32) is occupying its locking position, and which comes to close off the outlet of the shaft (43) when the rod (32) is occupying its unlocking position. - Steam-producing boiler according to claim 2,
characterised in that the end part (39b) of the cap (39) is surrounded by a sealing joint (15) mounted in an opening (16) formed in the accessibility face (17) of the enclosure (1), whilst the head (32b) of the rod (32) carries a sealing joint (38) which comes to bear on the said end part (39b) of the cap (39) when the rod (32) is occupying its unlocking position. - Steam-producing boiler according to one of claims 1 to 3,
characterised in that the deformable member (45) of the safety device consists of a hollow membrane open towards the inside of the boiler body (2). - Steam-producing boiler according to claim 4,
characterised in that the hollow membrane (45) has the shape of a balloon with a cross section substantially in the shape of a Ω, the end edge (45a) of which is held in a gripping zone (47a) formed in a ring (47) mounted coaxially in the sleeve (3) and interposed in abutment between the other end part (39a) of the cap (39) and a shoulder (51) provided in the part of the sleeve (3) which is situated inside the boiler body (2).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9306952 | 1993-06-09 | ||
| FR9306952A FR2706587B1 (en) | 1993-06-09 | 1993-06-09 | Safety device for a boiler, in particular for an iron. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0628766A1 EP0628766A1 (en) | 1994-12-14 |
| EP0628766B1 true EP0628766B1 (en) | 1997-04-16 |
Family
ID=9447947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19940401288 Expired - Lifetime EP0628766B1 (en) | 1993-06-09 | 1994-06-08 | Steam boiler with safety device |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0628766B1 (en) |
| DE (1) | DE69402609T2 (en) |
| ES (1) | ES2103551T3 (en) |
| FR (1) | FR2706587B1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29605202U1 (en) * | 1996-03-20 | 1997-07-17 | Siemens Ag | Mechanically triggering sealing plug with self-relief |
| GB2365028B (en) * | 1997-11-03 | 2002-05-08 | Richards Morphy N I Ltd | Steam generator iron with audible warning generation means |
| CN103411202B (en) * | 2013-08-16 | 2015-02-04 | 苏州德莱电器有限公司 | Handheld type steam equipment |
| CN105402706B (en) * | 2015-11-26 | 2017-10-27 | 江苏新美星包装机械股份有限公司 | A kind of dioxygen steam generator |
| EP3835479A1 (en) * | 2019-12-12 | 2021-06-16 | Koninklijke Philips N.V. | Safety system for a garment care device comprising a steam generator and an opening arranged in said steam generator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1167152B (en) * | 1983-01-14 | 1987-05-13 | Alfredo Cavalli | BOILER FOR STEAM PRODUCTION, ESPECIALLY FOR STEAM IRON |
| IT1217409B (en) * | 1988-04-13 | 1990-03-22 | Nuova Polti Spa | SAFETY CAP FOR STEAM PRESSURE CONTAINERS |
| IT1234093B (en) * | 1989-05-30 | 1992-04-29 | Mec Tappi Stampati Di Cau Giul | SAFETY PLUG FOR PRESSURE CONTAINERS |
| US5325895A (en) * | 1992-03-31 | 1994-07-05 | Dierre Finanziaria, S.R.L. | Device for filling and closing pressurized-steam containers |
-
1993
- 1993-06-09 FR FR9306952A patent/FR2706587B1/en not_active Expired - Fee Related
-
1994
- 1994-06-08 DE DE1994602609 patent/DE69402609T2/en not_active Expired - Fee Related
- 1994-06-08 ES ES94401288T patent/ES2103551T3/en not_active Expired - Lifetime
- 1994-06-08 EP EP19940401288 patent/EP0628766B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR2706587A1 (en) | 1994-12-23 |
| EP0628766A1 (en) | 1994-12-14 |
| DE69402609T2 (en) | 1997-08-14 |
| DE69402609D1 (en) | 1997-05-22 |
| FR2706587B1 (en) | 1995-11-10 |
| ES2103551T3 (en) | 1997-09-16 |
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