EP0112470B1 - Installation pour moules de fonderie - Google Patents

Installation pour moules de fonderie Download PDF

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Publication number
EP0112470B1
EP0112470B1 EP83111015A EP83111015A EP0112470B1 EP 0112470 B1 EP0112470 B1 EP 0112470B1 EP 83111015 A EP83111015 A EP 83111015A EP 83111015 A EP83111015 A EP 83111015A EP 0112470 B1 EP0112470 B1 EP 0112470B1
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EP
European Patent Office
Prior art keywords
station
moulding
pushing out
box
rectangular path
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
Application number
EP83111015A
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German (de)
English (en)
Other versions
EP0112470A1 (fr
Inventor
Bertold Heidler
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.)
BMD Badische Maschinenfabrik Durlach GmbH
Original Assignee
BMD Badische Maschinenfabrik Durlach GmbH
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 BMD Badische Maschinenfabrik Durlach GmbH filed Critical BMD Badische Maschinenfabrik Durlach GmbH
Publication of EP0112470A1 publication Critical patent/EP0112470A1/fr
Application granted granted Critical
Publication of EP0112470B1 publication Critical patent/EP0112470B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C25/00—Foundry moulding plants

Definitions

  • the invention relates to a foundry door system with a molding machine, in which the upper and lower boxes of a box mold are alternately produced, a rectangular path incorporating the molding machine, a turning station for the molded lower box, a core insertion section, and a feed station for the molded upper and Lower box, an ejection station for the complete mold and a separating station, from which the empty lower and upper box are successively fed to the molding machine, and with a casting and cooling section.
  • Molding systems of this structure for box casting are known in many embodiments. Their special training and the arrangement of the various workstations are based on the spatial conditions and in individual cases also on the special casting requirements that are placed on this molding system.
  • the aim is in particular to keep the number of molding boxes circulating in the system as low as possible in order to reduce the costs of the system on the one hand and the transport costs for the empty molding boxes on the other.
  • the known system forming the preamble of claim 1 (DE-AS 1 962131) an elongated rectangular web is provided, on one long side of which the separating station, the molding machine, the core insertion section and the feed station are arranged one behind the other.
  • the complete box shapes go via a cross conveyor to the other long side of the rectangular web, which is extended beyond the cross conveyor.
  • This long side of the rectangular path encloses the casting and cooling section, two plate belt conveyors being arranged one above the other.
  • Each apron conveyor has two places next to each other. The construction costs for conveyors and the space required for this molding plant is considerable.
  • the invention has for its object to provide a foundry molding system for box casting with the structure described above that a space-saving compact design with the possibility of adaptation to any application is possible and the manufacturing costs of such a system can be significantly reduced.
  • the molding machine and the turning station are arranged on a head side of the molding plant, which is formed by a narrow side of the rectangular web, a longer section of the rectangular web connecting in the conveying direction, the section of the rectangular web forming the long side of the rectangular web, the core insertion section, the feed station and the casting section, while the parallel, longer section of the rectangular section forming the other long side of the rectangular section is designed as a cooling section and is led back to the molding machine from near the molding machine, from which the molds pass to a further cooling section lying directly next to this cooling section with the opposite conveying direction , while the empty molding boxes with the opposite direction reach the molding machine via the separating station.
  • the casting section and the first part of the cooling section, on which the molds are still in the mold box, can be arranged relatively close to each other and in parallel, so that there is a narrow rectangular path.
  • the narrow side of the rectangular web located at the top of the system will generally be somewhat wider.
  • this additional space requirement is used sensibly in that the second part of the cooling section is arranged directly next to its first part and the conveying direction on these two parts of the cooling section, which are connected to one another via the ejection station, is opposite to one another, so that the Total length of the system is limited to the necessary extent.
  • the length of the core insertion and casting section, as well as the length of the cooling section can be adapted to very different needs without difficulty by shortening or lengthening the individual conveyor sections accordingly.
  • the separating station for the empty molding box and immediately behind the molding machine and in front of the turning station, a sand wiping and funnel drilling station is arranged on the narrow side of the rectangular path on the head side of the molding system.
  • the narrow side of the rectangular web is arranged on the head side of the molding system at such a high level that the molding machine can be set up at floor level, and that the separating station is arranged on this narrow side at one corner of the rectangular web and is equipped with a separator that is used to separate the empty ones Mold box overcomes the difference between the normal level of the rectangular sheet and the elevated level on the narrow side of the rectangular sheet, while a lowering station for the molded upper and lower boxes is arranged on the opposite corner in the conveying direction.
  • the molding machine can be set up at normal floor level, so that the otherwise extensive construction measures for a foundation pit can be dispensed with.
  • all that is required is the pit for the waste sand, which, however, has no special structural requirements.
  • Overcoming the level difference requires no special lifting device due to the arrangement and design of the separating device, since only the stroke of the separating device has to be extended accordingly.
  • the further cooling section, on which the expressed forms are released is also arranged at approximately the same level as the section of the rectangular path, which is located on the top side of the installation and is formed by a narrow side.
  • the level difference is overcome in a simple manner by the lifting movement of the device arranged at the ejection station.
  • the design of the molding plant according to the invention gives the possibility that the section of the rectangular path between the ejection station via the separating station, the molding machine, the lowering station and the loading station as the box roller conveyor directly receiving the crates and the section of the cooling section which receives the casting line and the cast box molds Ejecting station are designed as a pallet path, the ejecting station on one long side of the rectangular path and the loading station on the other long side lying opposite one another and connected by a pallet transfer device.
  • the end of the casting section and the opposite start of the cooling section are expediently connected by a pallet transfer device.
  • a pallet transfer device Both this and the translator between the ejection station and the loading station can be realized in a simple manner by a rail-bound carriage, which in turn has rail sections on its top for the rollers of the pallets.
  • the part of the cooling section adjoining the pressing-out station can have at least two forms next to one another.
  • This known molding system is further developed according to the invention in that this part of the cooling section consists of at least two endless rubber belt conveyors arranged next to one another, in front of the head side of which the ejection station is arranged, on which in turn an upwardly acting ejection cylinder is arranged, which is located between two positions on the top side each of the two rubber belt conveyors is movable.
  • a slide is provided which transfers the shape from the push-out cylinder to the rubber belt conveyor.
  • plate belt conveyors have been used in the area of the cooling section, which generally have two, possibly more, places next to each other.
  • the advantage of these apron conveyors is that the molds can be pushed on from the side.
  • Rubber belt conveyors are much cheaper, but the molds cannot be pushed side by side, which is why only one single belt has been used so far.
  • at least two such rubber belt conveyors are arranged next to one another and the pushing-out and transfer station is located directly on the head side of these rubber belt conveyors, so that the molds can be transferred alternately to one or the other conveyor. This ensures a steady work cycle across the entire molding line.
  • a pit is arranged under the ejection station, in which there is a device for removing the waste sand.
  • This device is generally designed as a belt conveyor.
  • the design according to the invention at the ejection station with an ejection cylinder that can be moved between the two head ends of the rubber belt conveyor opens up the possibility that the device guiding the waste sand away consists of a slide arranged on the movable ejection cylinder and reaching to the bottom of the pit, which moves with every movement of the ejection cylinder one pushing station pushes the molding sand out of the pit towards the other pushing station. So there is no separate conveyor for the waste sand.
  • the conveying movement is generated by the driving movement of the push-out cylinder, the slide serving as a simple conveying means in the manner of a snow plow or the like.
  • a cover for the pit trailing the slide when the slide is moved can be arranged on the movable ejection cylinder.
  • the ejection cylinder is advantageously seated on a rail-bound carriage on which the slide and the cover are arranged.
  • the squeezing cylinder is located largely inside the pit in front of the slider. This has the advantage that the ejection cylinder does not have to be designed as an expensive telescopic cylinder.
  • a pit with a conveyor for transporting the waste sand away is arranged below the narrow side of the rectangular web on the head side of the molding plant and along one long side of the rectangular web into the region of the ejection station, and that the bottom of the pit at the ejection station extends to above the waste sand conveyor on the long side of the rectangular track.
  • the two only necessary waste sand pits are connected via a relatively short pit on one long side.
  • the molding sand at the ejection station is transferred directly to the conveyor running in the pit on the long side.
  • the aforementioned embodiment is further developed in a preferred manner in that the waste sand conveyor is guided out of the pit immediately after the pressing-out station up to the level of the molds on the rubber belt conveyor of the cooling section and a transverse conveyor is arranged below its discharge end, which conveys the waste sand onto the molds throws off.
  • the outline of the foundry molding system is essentially determined by an elongated rectangular path, which is composed of several sections of different functions.
  • the centerpiece of every molding system is the molding machine, designated here by 1, which is arranged on the top side of the rectangular web within the same. It works together with a section 2 forming a narrow side of the rectangular web and has two stations, of which station 3 is located in front of the molding machine within section 2 of the rectangular web, while the second station is arranged within the molding machine.
  • station 3 there is a stationary molding sand filling vessel 4, which is fed from a molding sand hopper 5 located next to the molding system via a conveyor 6.
  • a pressing unit 7 which can be moved between the two stations, and immediately above the pressing unit 7 there is a model plate carrier 8 with a model.
  • This can be replaced by another model by means of a model changing device 9.
  • the model for the upper box and the lower box of a mold are arranged side by side.
  • a work cycle takes place in such a way that the pressing unit 7 moves upwards in station 3 against the model plate carrier, takes it along on its further stroke and against the box part located in station 3 on the conveyor track, e.g. drives a lower box 10, also takes it along and presses it against the opening edge of the filling vessel 4.
  • a filling frame can also be provided.
  • the pressing unit 7 with the lower box 10 is lowered somewhat and moved into the molding machine in order to raise the lower box 10 again there and to press it against the compression unit.
  • the molding sand can be compressed pneumatically, mechanically or in a combined manner.
  • the molded lower box is moved back into station 3 by the compression unit, in order then to be transported further on section 2 in the direction of arrow 12 (FIG. 1), for example following an upper box 11 (FIG. 4).
  • the box parts 10, 11 successively reach a stripping device 13 in the manner of a plow, which strips off the molding sand that protrudes from the back of the mold.
  • a hopper drilling device 14 which can be brought into several positions with respect to the shape.
  • a turning station 15 follows, in which the lower box is turned so that the mold is accessible from above, while the upper box is already in the appropriate position.
  • Section 2 of the rectangular path is arranged considerably above floor level in such a way that the entire molding machine 1 can be set up at floor level.
  • a lowering device 16 which lowers the mold box halves to the working level, as is the case with the lower box 10 shown at the bottom right.
  • the rectangular path is formed by on-board roller conveyors.
  • the mold box halves reach a core insertion section 17 on a long side of the rectangular web (FIG. 1).
  • the core insertion section 17 has a plurality of stations 18 for inserting cores, in particular into the lower box.
  • the core insertion section 17 is followed by an additional device 19, by means of which the upper box 11 is raised and, after passing underneath, the lower box is lowered onto it.
  • the complete molding box is taken over by a pallet truck 20 which in turn is moved up by means of a transport carriage which can be moved on rails 21 (FIGS. 1 and 2).
  • the pallet truck with the complete molding box 22 then arrives at a rail track 23, which makes up the majority of one long side of the rectangular track and serves as a casting section 24.
  • a brake cylinder 25 and a translating device 26 are in turn arranged in the form of a rail-bound carriage 26, which in turn has rails 27 for the pallet carriage on the upper side.
  • the pallet truck with the molding box arrives by means of this translating device on the other long side of the rectangular path, where in turn rails are arranged, on which the pallet trucks are cyclically moved forward with a push cylinder 28.
  • This section 29 of the rectangular path forms a first part of a cooling section, on which the mold is still located within the mold box.
  • the molding boxes transported in the direction of the arrow 30 arrive in the region of the molding machine 1 in a further translating device 31, which essentially consists of a gripper 32 (FIG. 5) which can be moved horizontally and raised and lowered.
  • the molding box is lifted off the pallet carriage 20 by means of the gripper 32.
  • the pallet truck 20 reaches the feeder 19 again via the rail track 21 already described. In this way, the pallet circulation is closed.
  • the molding box 32 hanging in the gripper is moved into one of the two positions 33 or 34, which are arranged directly next to one another and at the end of the feed of a rubber conveyor belt 35, 36.
  • the rubber belt conveyors 35, 36 run in the direction of arrow 41, that is, counter to the conveying direction on the first part of the cooling section 29 and form the larger second part of the cooling section, which is arranged directly next to the first part 29.
  • the molds 40 arrive by means of the rubber belt conveyors 35, 36 at a delivery station 42, from which they go to an unpacking station, e.g. a vibrating grate 43 are transferred to separate the casting from the molding sand.
  • a section 44 of the rectangular path connects to the ejection station, namely at its position 34, which transfers the empty molding box to a separating device 45, where the upper box and lower box are separated from one another and fed to the station 3 in front of the molding machine 1 one after the other.
  • the mold box halves are raised again from the normal level to the elevated level by the separating device having a correspondingly larger stroke.
  • a pit 46 In the area of section 2 on the narrow side of the rectangular path, a pit 46 is arranged, in which a belt conveyor 47 rotates under all working positions on this section, which picks up the waste sand accumulating at these working positions and transfers it to a belt conveyor 53 running perpendicularly to it. This runs in a short pit 48 on the long side of the rectangular path from the height of the separating device 45 to the level of the squeezing station.
  • a pit 49 is also arranged below the pushing-out station with the positions 33, 34, into which the waste sand resulting from the pushing out passes.
  • a slide 50 is arranged on the carriage 39 with the push-out cylinder 37 and the push-out plate 38 and extends to the bottom of the pit 49. Furthermore, a cover 51 is arranged on the carriage 39, which prevents the molding sand from falling into the space behind the slide 50.
  • the slide 50 takes along the molding sand in the pit.
  • the pit 49 ends with an opening 52 immediately above the belt conveyor 53 running in the pit 48.
  • the belt conveyor 53 is led upwards immediately behind the ejection station (FIG. 3) and transfers the waste sand to a cross-conveying device, e.g. a slide 54, which ends above the molds 40 circulating on the rubber band 36 and drops the waste sand onto these molds.
  • the first part 29 of the cooling section can also be used as an additional casting section if, for example, the melt has to be poured quickly and completely, e.g. with nodular cast iron. This then happens when the system is at a standstill.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)

Claims (13)

1. Installation de moulage pour, fonderie avec une machine à mouler (1) dans laquelle le châssis de dessus (11 ) et le châssis de dessous (10) d'un moule en châssis sont confectionnés à tour de rôle, un chemin rectangulaire comprenant la machine à mouler (1) et comportant un poste de retournement (15) pour le châssis de dessous (10) avec l'empreinte du modèle, un parcours de mise en place du noyau (17), un poste de fermeture du moule (19) pour le châssis de dessus (11 ) avec l'empreinte du modèle et le châssis de dessous (10) avec l'empreinte du modèle, un poste d'extraction (33, 34) pour le moule complet (40) et un poste de séparation (45) d'où le châssis de dessous (10) vide et le châssis de dessus (11) vide sont amenés l'un après l'autre à la machine à mouler (1 ), et avec un parcours de coulée (24) et un parcours de refroidissement (29), caractérisée en ce que d'un côté de tête de l'installation de moulage, qui est formé par un petit côté (2) du chemin rectangulaire, la machine à mouler (1 ) et le poste de retournement (15) sont disposés, qu'une section plus longue raccordée perpendiculairement dans la direction de transport (12) et qui forme un grand côté du chemin rectangulaire, comporte le parcours de mise en place du noyau (17), le poste de mise en place du noyau (19) et le parcours de coulée (24), tandis que la section plus longue du chemin rectangulaire qui lui est parallèle et qui forme l'autre grand côté de ce chemin rectangulaire est réalisée sous la forme d'un parcours de refroidissement (29) et revient près de la machine à mouler (1), jusqu'au poste d'extraction (33, 34) d'où les moules (40) arrivent sur un parcours de refroidissement supplémentaire (35, 36) situé directement à côté de ce parcours de refroidissement (29) et à sens de transport opposé (41), tandis que les châssis de moule vides, avec un sens de transport de nouveau opposé, arrivent à la machine à mouler (1 ) en passant par le poste de séparation (45).
2. Installation de moulage selon la revendication 1, caractérisée en ce que du côté de tête de cette installation de moulage, sur le petit côté (2) du chemin rectangulaire, juste avant la machine à mouler (1 ), le poste de séparation (45) est disposé, et juste après cette machine à mouler et avant le poste de retournement (15), un poste de raclage du sable (13) et de perçage de trous en entonnoir (14) est disposé.
3. Installation de moulage selon la revendication 2, caractérisée en ce que le petit côté (2) du chemin rectangulaire, du côté de tête de cette installation de moulage, est disposé à un niveau dont la hauteur est telle que la machine à mouler (1 ) peut être installée au niveau du sol, et que le poste de séparation (45) est disposé sur ce petit côté, à un angle du chemin rectangulaire, et est équipé d'un appareil de séparation qui, à l'occasion de la séparation des châssis de moule vides, compense la différence entre le niveau normal du chemin rectanguiaire et le niveau plus élevé du petit côté de ce chemin, tandis qu'à l'angle opposé, un poste d'abaissement (16) pour les châssis de dessus et de dessous (11, 10) avec l'empreinte du modèle est disposé.
4. Installation de moulage selon l'une des revendications précédentes, caractérisée en ce que le parcours de refroidissement supplémentaire (35, 36), sur lequel les moules (40) extraits des châssis sont déposés, est disposé approximativement au même niveau que la section (2) du chemin rectangulaire qui se trouve du côté de tête de l'installation et est formé par un petit côté de ce chemin rectangulaire.
5. Installation de moulage selon l'une des revendications précédentes, caractérisée en ce que la section du chemin rectangulaire comprise entre le poste d'extraction (33, 34) et le poste de fermeture des moules (19), en passant par le poste de séparation (45), la machine à mouler (1 ) et le poste d'abaissement (16), est réalisée sous la forme d'un chemin à rouleaux à collerettes recevant directement les châssis (10, 11), et que le parcours de coulée (24) et la section (29) du parcours de refroidissement qui reçoit les moules en châssis contenant la pièce coulée, jusqu'au poste d'extraction (33, 34), sont réalisés sous la forme d'un chemin à palettes, et que ce poste d'extraction est disposé sur l'un des grands côtés du chemin rectangulaire et le poste de fermeture des moules (19) sur l'autre grand côté, ces deux postes étant situés l'un en face de l'aute et reliés par un appareil de transfert à palettes (21, 26).
6. Installation de moulage selon l'une des revendications précédentes, caractérisée en ce que l'extrémité du parcours de coulée (24) et le début du parcours de refroidissement (29), qui se trouve en face, sont reliés par un appareil de transfert à palettes (26, 27).
7. Installation de moulage selon l'une des revendications précédentes, dans laquelle la partie du parcours de refroidissement (29) qui fait suite au poste d'extraction (33, 34) reçoit au moins deux moules l'un à côté de l'autre, caractérisée en ce que cette partie du parcours de refroidissement (29) se compose d'au moins deux transporteurs sans fin à bande de caoutchouc (35, 36) devant le côté de tête desquels le poste d'extraction (33, 34) est disposé et auquel poste un vérin d'extraction agissant vers le haut (37) est disposé et peut être déplacé entre deux positions (33, 34) correspondant chacune au côté de tête d'un des transporteurs à bande de caoutchouc (35, 36), respectivement.
8. Installation de moulage selon la revendication 7, avec une fosse (49) disposée sous le poste d'extraction (33, 34) et un dispositif disposé dans cette fosse pour l'évacuation du sable qui tombe, caractérisée en ce que ce dispositif se compose d'un organe pousseur (50) monté sur le vérin d'extraction déplaçable (37) et descendant jusqu'au fond de la fosse (49) et qui, lors de chaque déplacement du vérin (37) d'un poste d'extraction (33) à l'autre poste d'extraction (34), pousse le sable de moulage hors de la fosse (49).
9. Installation de moulage selon la revendication 8, caractérisée en ce qu'un couvercle (51 ) pour la fosse (49), qui suit l'organe pousseur (50) dans son mouvement de poussée, peut être fixé au vérin d'extraction déplaçable (37).
10. Installation demoulage selon l'une des revendications 1 à 9, caractérisée en ce que le vérin d'extraction repose sur un chariot se déplaçant sur des rails et auquel l'organe pousseur et le couvercle sont fixés.
11. Installation de moulage selon l'une des revendications 1 à 10, caractérisée en ce que le vérin d'extraction (37) s'étend largement à l'intérieur de la fosse (49) devant l'organe pousseur (50).
12. Installation de moulage selon l'une des revendications 1 à 11, caractérisée en ce qu'au-dessous du petit côté (2) du chemin rectangulaire, du côté de tête de l'installation de moulage et le long d'un des grands côtés du chemin rectangulaire, jusque dans la zone du poste d'extraction (33, 34), est disposée une fosse (46, 48) avec un transporteur (47, 53) pour l'évacuation du sable qui tombe et que le fond de la fosse (49) arrive au poste d'extraction (33, 34) jusqu'au-dessus du transporteur (53) du sable qui tombe, sur le grand côté du chemin rectangulaire.
13. Installation de moulage selon l'une des revendications 1 à 12, caractérisée en ce que le transporteur (53) pour le sable qui tombe, immédiatement après le poste d'extraction (33, 34), sort de la fosse et arrive au-dessus du niveau des moules (40) posés sur le transporteur à bande de caoutchouc (35, 36) du parcours de refroidissement et qu'un transporteur transversal (54) est disposé au-dessous de son extrémité de livraison qui déverse sur les moules (40) le sable qui tombe.
EP83111015A 1982-11-09 1983-11-04 Installation pour moules de fonderie Expired EP0112470B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3241288 1982-11-09
DE19823241288 DE3241288A1 (de) 1982-11-09 1982-11-09 Giesserei-formanlage

Publications (2)

Publication Number Publication Date
EP0112470A1 EP0112470A1 (fr) 1984-07-04
EP0112470B1 true EP0112470B1 (fr) 1987-01-28

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EP83111015A Expired EP0112470B1 (fr) 1982-11-09 1983-11-04 Installation pour moules de fonderie

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EP (1) EP0112470B1 (fr)
DE (2) DE3241288A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4628986A (en) * 1985-03-26 1986-12-16 Combustion Engineering, Inc. Molding register system
DE3819118C2 (de) * 1988-06-04 1995-08-17 Wagner Heinrich Sinto Masch Formanlage
ES2029651A6 (es) * 1991-03-26 1992-08-16 Erana Agustin Arana Mejoras en instalaciones de moldeo de motas para fundicion.
DE4226778A1 (de) * 1992-08-13 1994-02-17 Badische Maschf Gmbh Verfahren zum Transportieren von Formkasten und nach dem Verfahren arbeitende Gießerei-Formanlage
CN103418756B (zh) * 2012-05-14 2015-07-08 辽阳市富祥曲轴有限公司 铁型覆砂自动流水线
CN105903947A (zh) * 2016-05-20 2016-08-31 许云东 一种无小车水平有箱的造型线
CN106734963B (zh) * 2017-03-01 2018-11-09 十堰捷茂工贸有限公司 一种薄壁壳类铸件、及其造型生产线和方法
CN108838344A (zh) * 2018-07-16 2018-11-20 青岛恒林机械有限公司 一种环保节能v法造型生产线

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1962131B1 (de) * 1969-12-11 1971-10-28 Badische Maschf Gmbh Automatische Formanlage und Betriebsverfahren hierzu
DE2218683A1 (de) * 1972-04-18 1973-10-25 Foundry Design Corp Anlage zum betrieb einer giesserei
US4224979A (en) * 1977-10-31 1980-09-30 Mcneil Corporation Automatic foundry system

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Publication number Publication date
DE3241288A1 (de) 1984-05-10
EP0112470A1 (fr) 1984-07-04
DE3369473D1 (en) 1987-03-05

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