EP0276751A1 - Dispositif pour remplir séparément des récipient de produits liquides - Google Patents

Dispositif pour remplir séparément des récipient de produits liquides Download PDF

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Publication number
EP0276751A1
EP0276751A1 EP88100817A EP88100817A EP0276751A1 EP 0276751 A1 EP0276751 A1 EP 0276751A1 EP 88100817 A EP88100817 A EP 88100817A EP 88100817 A EP88100817 A EP 88100817A EP 0276751 A1 EP0276751 A1 EP 0276751A1
Authority
EP
European Patent Office
Prior art keywords
filling
section
slide sleeve
transverse wall
wall piece
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
EP88100817A
Other languages
German (de)
English (en)
Other versions
EP0276751B1 (fr
Inventor
Hubert Skibowski
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.)
Dover Corp
Original Assignee
Dover Corp
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 Dover Corp filed Critical Dover Corp
Publication of EP0276751A1 publication Critical patent/EP0276751A1/fr
Application granted granted Critical
Publication of EP0276751B1 publication Critical patent/EP0276751B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
    • B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
    • B67C3/30—Filling of barrels or casks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
    • B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
    • B67C3/02—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
    • B67C3/22—Details
    • B67C3/26—Filling-heads; Means for engaging filling-heads with bottle necks

Definitions

  • the invention relates to a device for filling flowable products into individual vessels, for example barrels according to the preamble of patent claim 1.
  • a filling valve has become known in which a slide sleeve can be moved coaxially to a pipe section, which in the retracted open position releases an outlet opening lying between the pipe wall and a transverse wall piece arranged transversely to the pipe wall and in the closed position with a sealing surface of the transverse wall piece is in sealing engagement.
  • the transverse wall piece is designed as a pig striking surface, and the inner wall of the slide sleeve acts in a sealing manner with the transverse wall piece.
  • the known filling fitting described or other known filling fittings are arranged at the end of a filling line and are used for filling tanks, containers or the like.
  • the filling valve must perform a lifting movement between the idle and the operating state. This is conventionally done in that the filling hose or a filling pipe or the container to be filled is raised or lowered accordingly. A corresponding lifting device is required for this.
  • the effort for the lifting device is considerable. Since the lifting device has to move a relatively large mass, relatively long adjustment times are necessary. The effort described and the relatively long adjustment times are acceptable when filling larger containers.
  • the situation is different when filling containers such as drums, canisters, cans or the like.
  • the empty containers can be brought in automatically relatively quickly.
  • the filling cycle is therefore primarily dependent on the time it takes to move the filling valve out of the filled container and to insert it into the bunghole of a new container.
  • the invention is therefore based on the object of providing a device for filling flowable products into individual vessels which requires relatively little adjustment effort and at the same time enables short adjustment times with precise guidance of the filling fitting.
  • the slide sleeve serving as a shut-off element is moved back when the filling valve is brought into the open position.
  • the slide sleeve is in the open position beyond the transverse wall piece.
  • the slide sleeve is dimensioned so long that when it moves into the open position towards the filler opening of the vessel or into it.
  • the Slider sleeve has a free space on the inside, which in the open position forms an axial channel between the transverse wall piece and the slider sleeve.
  • the filling valve is thus designed as a telescopic part such that the filling valve is extended in the open position.
  • the degree of elongation is determined by the length of the slide sleeve or by the position of the free space in the slide sleeve.
  • the vessels to be filled are usually at a predetermined level, for example on a roller conveyor / weighing platform. This also specifies the level that the filling head or the filling valve must maintain in order to allow unhindered transport of the vessels under a filling valve. Likewise, the path is determined which must be covered in order to sufficiently approach or dip into the bunghole of the vessel. The length of the slide sleeve or the distance of the free space from the sealing section of the slide sleeve is therefore fixed.
  • the slide sleeve Since in the device according to the invention only the slide sleeve dips into the bung hole, precise guidance of the slide sleeve can be ensured in such a way that contact with the bung hole wall can be avoided with certainty. If the slide sleeve is provided with a bulge at the bottom, the container can also be centered. If the slide sleeve continues to immerse, it is at the sides at a distance from the hole wall. This does not affect the weighing process and the escaping air can easily escape from the inside of the vessel. The slide sleeve can also be relieved of pressure.
  • the transverse wall piece is preferably provided with a circumferential radial sealing arrangement which interacts with the inner wall of the slide sleeve.
  • a circumferential radial sealing arrangement which interacts with the inner wall of the slide sleeve.
  • the sealing arrangement is provided with a sealing ring which is arranged in a radially movable manner in an undercut groove in the transverse wall piece.
  • a radially resilient ring Arranged in the groove on the inside of the sealing ring is a radially resilient ring, preferably made of an elastomer, which prestresses the sealing ring radially outwards in such a way that it passes over the transverse wall piece protrudes radially.
  • the transverse wall piece is preferably divided into two. The described sealing arrangement ensures that only this is in engagement with the inner wall of the slide sleeve and not with the transverse wall piece itself.
  • the transverse wall piece is preferably connected to the tube section via a plurality of ribs which are spaced radially in the circumferential direction.
  • the flat ribs preferably extend in the axial direction or parallel to the axis, so that they hinder the flow little, but counteract a possible flow swirl.
  • an embodiment of the invention provides that the pipe section can be detachably connected to a pipe socket of the feed line.
  • the filling valve can be attached or removed, for example, by simply screwing it onto the pipe socket of the supply line.
  • the feed line has a horizontal section, to which at least one pipe connection pointing downward is attached to the pipe section.
  • a plurality of filling fittings can be connected to the horizontal section of the feed line, each of which maintains a space between them.
  • Each filling valve can be assigned to a conveying path on which the containers are fed to the filling valve one after the other.
  • the filling valve can be placed very close to the feed line. In the case of a pig of the feed line, only the medium immediately present in the fitting is therefore not detected. The residual medium can e.g. be expelled using compressed air. It is also possible to pig up to the transverse wall piece if the feed line has the same cross section as the filling fitting.
  • an embodiment of the invention provides that a holding device holding the horizontal line section is provided, which is provided with a lifting device for the horizontal line section.
  • the lifting device can adapt to different vessel heights in order to carry out a conventional upper mirror filling. It can also be used to use a very long filling valve. This consists of the head already described above as well a longer intermediate piece between the head and the feed line. With the aid of such a filling valve, a so-called under-mirror filling or partial under-mirror filling can be carried out. To do this, the filling head dips deep into the vessel and slowly moves upwards with the rising product level.
  • a connecting section which is variable in length is therefore to be arranged.
  • the connecting line section consists of two articulated arms which work together like scissors and which adapt to a height adjustment of the filling fitting.
  • the filling valve according to the invention is expediently attached to a line section which is provided at both ends with connecting flanges. With the help of the units containing the filling valve, any length can be built with a desired number of filling valves of a filling system.
  • an embodiment of the invention provides that the piston rod of the adjusting cylinder is passed through the bore of a line-fixed guide part, the piston rod has an annular groove and a radially movable locking element is arranged in the bore wall, which is arranged radially inward with the aid of a locking device is acted upon. If the flow rate is to be reduced, the adjusting cylinder partially moves the slide sleeve into the closed position. The adjustment is limited by engaging the locking element in the locking groove of the piston rod.
  • the locking element can be formed by one or more locking balls. Alternatively, radially movable ring segments or the like can also be provided.
  • pig receptacle and Transmitter assemblies in the feed line are produced in that on the diametrically opposite side of the filling valve a pig trap element is mounted so that it can be moved diametrically by means of an adjusting cylinder into the inlet opening of the filling valve.
  • the pig trap element can be, for example, a so-called pig trap.
  • a piggable filling device enables different products to be filled using the same feed line and the same filling fittings.
  • an embodiment of the invention provides that a plurality of reservoirs are connected to a ring-shaped supply line via a piggable T shut-off valve and a control valve is arranged in the return section of the supply line.
  • a pump circulates the medium before the filling process. This prevents a closing of a filling head from causing a noticeable increase in pressure in another opened filling head and thus excessive flow energy of the escaping product. In this way it is possible to pig the complete supply line and residual medium from the supply line to the respective reservoir push back.
  • Fig. 1 three reservoirs 10, 11 and 12 can be seen, which are connected via lines 13, 14, 15 to T-shaped shut-off valves 16, 17 and 18.
  • Shut-off fittings can be provided in lines 13 to 15.
  • the crossbars of the T-armatures 16 to 18 lie in the course of an annular feed line 19.
  • Each T-armature 16 to 18 is assigned an adjusting device 20.
  • the T-shaped fittings 16 to 18 are piggable, i.e. they can be passed through in the open as well as the closed position by a pig sent through line 19 with almost no residual amount.
  • a feed pump 19a is shunted.
  • a shut-off valve 19b is connected in line 19. It is piggable, just like the branch points, which can be designed as piggable T-fittings, comparable to T-fittings 16 to 18.
  • filling heads 21, 22 and 23 are arranged in the course of the lower region of the annular feed line 19, three filling heads 21, 22 and 23 are arranged. Details of the filling heads 21 to 23 are explained below. They are located in a horizontal feed line section 24, which is supported on a substrate by two lifting devices 25, 26. The height of the line section 24 can be changed with the aid of the lifting devices. This also changes the height of the filling fittings 21 to 23.
  • the filling fittings 21 to 23 and the lifting devices 25 and 26 are part of a filling station 27, in which three roller conveyors 28, 29 and 30 are also arranged. The conveying direction of the roller conveyors 28 to 30 is perpendicular to the plane of the drawing. In the area of the filling station 27, the roller conveyors 28 to 30 are part of a weighing device, which is indicated by the dashed lines at 31.
  • the horizontal line section 24 is connected to the left branch of the feed line 19 via a first articulated arm 32 and a second articulated arm 33.
  • the arms 32, 33 are coupled to one another via a swivel joint.
  • the arms 32 and 33 are also coupled to the adjacent line sections via rotary joints.
  • the line section 24 is coupled to an articulated arm 34 via a swivel joint.
  • the articulated arm 33 is coupled to a further articulated arm 35 via a swivel joint.
  • the articulated arms 32 to 35 form a kind of scissors, which allow a height adjustment of the feed line section 24 with constant connection to the rest of the feed line.
  • the articulated arm 35 is connected to a pig transmission and reception station 36 via a swivel joint.
  • the pig sending and receiving station 36 is connected to a control valve 37 which in turn is connected to a further pig sending and and receiving station 38 is connected. This is connected to the line section leading to the T-fitting 18. Both pig stations 36 and 38 can each hold two pigs.
  • vessels moved forward on the roller conveyors 28 to 30 can be filled with a liquid product from the reservoirs 10, 11 or 12.
  • the corresponding T-fitting 16, 17 or 18 is opened during the filling process.
  • the pump 19b conveys the medium from a reservoir in a circle via the open fitting 37, the quantity conveyed being greater than the maximum dispensing quantity via the three filling heads 21 to 23.
  • the adjustment of the regulating fitting 37 ensures the admission pressure on Filling head. In this way it is ensured that when closing or throttling a filling head there is no significant pressure surge with a noticeable increase in pressure on an open filling head.
  • the feed line can then be cleaned, the product being able to flow back into the corresponding reservoir via the open shut-off valve 37.
  • the filling station 27 is shown in more detail in FIGS. It can be seen that the filling heads are 21 to 23 units which are attached by means of straight pipe pieces 39 and flanges 40 in the course of the line section 24. It can be seen that the line section 24 represents a U lying horizontally, the legs of which are supported in the rear area by means of telescopic supports 25, 26 on the ground.
  • a threaded spindle 41 is arranged in a tube 42.
  • the threaded spindle is in engagement with an adjusting nut 43, which is provided with a handle for the purpose of height adjustment of the threaded spindle 41.
  • the threaded spindle is connected to the line section 24.
  • the height of the line section 24 can be adjusted to an arbitrary dimension and thus also the height of the filling heads 21 to 23.
  • barrels 44 which are fed on the roller conveyors 28 to 30 should be be filled.
  • the filling head 21 is shown in more detail in FIGS. 5 and 6.
  • a pipe socket 45 is attached to the pipe section 39, pointing radially downward.
  • the pipe socket 45 has an external thread on an enlarged part, onto which a union nut 46 can be screwed.
  • the union nut 46 is used to attach a pipe section 47 via a connector, not shown.
  • the pipe section 47 is smooth on the inside and outside. At its end, it holds a transverse wall piece 48, which consists of two parts 49, 50, which interlock in a radial plane and are clamped together with the aid of a screw 51.
  • the part 49 is connected to the end of the tube section 47 via a plurality of flat ribs 51 which are evenly spaced in the circumferential direction.
  • the plane of the ribs 51 lies in the diameter planes of the tube section 47.
  • a radially acting circumferential seal 52 sits on the transverse wall piece 48, which is shown enlarged to the left of FIG. 6. It can be seen that an undercut annular groove 53 is formed by the parts 49, 50, in which the enlarged section of a sealing ring 54 sits, which projects radially outward beyond the transverse wall piece 48 via the narrowed gap of the groove.
  • an elastomeric ring 55 Arranged radially inside the sealing ring 54 is an elastomeric ring 55, which prestresses the sealing ring 54 radially outwards.
  • the pipe section 47 is coaxially surrounded by a slide sleeve 56, which slides sealingly on the pipe section 47 in the upper region at 57.
  • an annular space 58 is formed between slide sleeve 56 and pipe section 47.
  • the annular space is created by radial expansion of the sleeve 56.
  • the sleeve 56 lies at a short distance from the outer wall of the tube section 56. In the position shown in FIG. 6, the inside of the sleeve 56 cooperates at the end with the ring seal 52.
  • the filling fitting formed by the tube section 47 and the sleeve 56 is therefore closed.
  • the medium entering from the pipe section 39 in the pipe socket 44 can not leave the filling valve.
  • the slide sleeve 56 is adjusted downwards until the annular space 58 seals arrangement 57 bridged, a passage for the medium is created via the space between the ribs 51 above the transverse wall part 49 and below the transverse wall part 50.
  • the medium can flow down into the sliding sleeve 56 which projects far downward. This is located inside the filling opening of a vessel, for example a barrel 44.
  • the slide sleeve 56 is bulged at the end at 59 in the manner of a bead. This bulge serves to center the vessel and to maintain a distance from the hole wall, so that the weighing is not influenced and the air can escape.
  • a circumferential groove half ring 60 On the upper end of the slide sleeve 56 sits a circumferential groove half ring 60.
  • the groove of the half ring 60 interacts with a groove of another half ring 61, which is attached to a piston rod 62 of an adjusting cylinder 63.
  • the piston rod extends through axial bores of two screwed-together guide parts 63, 64, which are fixedly connected to the pipe section 39 at 65.
  • the piston rod 62 has a circumferential groove 65.
  • a row of locking balls 66 is arranged in a circumferential groove, which are made of an elastomeric Ring 67 are surrounded.
  • the outside of the ring 67 is connected to a compressed air connection bore 68. If the bore 68 receives compressed air, the ring 67 acts on the locking balls 66 radially inwards. At the moment when the groove 65 reaches the locking balls 66, the movement of the adjusting cylinder 63 is stopped suddenly.
  • the groove 65 is arranged in such a way that the slide sleeve 56 assumes a throttle position in which, for example, an axial groove of variable cross section in the inner wall of the sleeve 56 forms a throttled passage in the area of the sealing arrangement 52.
  • the groove in the slide sleeve is preferably angled in order to set the medium in rotation, this prevents a thin, sharp beam from escaping, which could also falsify the measurement result.
  • a further guide bush 69 is arranged diametrically opposite the pipe socket 64.
  • An adjusting cylinder 70 is attached to the guide bush.
  • a pig trap mandrel 71 is guided in the guide bush 69 and can be actuated by the adjusting cylinder 70.
  • the catch mandrel 71 can be moved through an upper opening 72 in the pipe section 39, crossing the pipe section 39 diametrically, into the opening 73 to the pipe socket 44, where it approaches a stop 74 for limitation. In this case, the catch mandrel 71 forms a stop for a pig in the area of the discharge head 21.
  • a first filling head 80 to 81 with the piston is one on the side slotted cylinder 82 connected.
  • a second filling head 83 is connected to a piston of a laterally slotted cylinder 84.
  • the filling heads 80, 83 correspond to the filling heads 21 to 23, so that their construction is no longer discussed in detail.
  • the filling heads 80, 83 hang on ropes 85, 86 which are guided over an upper roller arrangement 87 and are each connected to a weight, one of which can be seen at 88 for the filling head 83 in FIG. 7.
  • the filling heads 80, 83 are articulated via articulated arms 89 and 90 via swivel joints.
  • the articulated arms 89, 90 are connected to articulated arms 92 and 93 via swivel joints 91.
  • the articulated arms 92, 93 are connected via pivot joints to stationary feed lines 94 and 95, which are guided below the level of a roller conveyor 96.
  • the roller conveyor is used to transport barrels, one of which is shown at 97 in FIGS. 7 to 9.
  • the filling heads 80, 83 can be adjusted to a large extent in their level.
  • the articulated arms 89 to 92 enable permanent connection to the feed lines 94, 95. It should also be mentioned that the articulated arms 89 to 93 and the filling heads 80 and 83 can be pigged up to the filling fittings.
  • the short filling fittings as drawn in solid lines in FIGS. 7 and 8, and those of the filling fitting according to FIGS. 5 and 6 is the same, can be replaced by a relatively long filling valve, as shown in FIG. 7 by the dash-dot line at 98. With the help of such an extended filling valve, this can be led to the bottom of the barrel 97, so that a bottom mirror filling is possible.
  • the valve 98 is raised synchronously until the slide sleeve projects into the bunghole as far as is customary with a normal filling. This movement described is carried out with the aid of the cylinders 82, 84.
  • the filling valve is closed in the manner described in connection with FIGS. 5 and 6, ie the slide sleeve is moved up out of the bung hole and releases the barrel 97 for further transport.

Landscapes

  • Basic Packing Technique (AREA)
  • Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
EP88100817A 1987-01-24 1988-01-21 Dispositif pour remplir séparément des récipient de produits liquides Expired - Lifetime EP0276751B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3702109 1987-01-24
DE3702109A DE3702109C1 (de) 1987-01-24 1987-01-24 Vorrichtung zum Abfuellen von fliesfaehigen Produkten in einzelne Gefaesse

Publications (2)

Publication Number Publication Date
EP0276751A1 true EP0276751A1 (fr) 1988-08-03
EP0276751B1 EP0276751B1 (fr) 1990-12-27

Family

ID=6319490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88100817A Expired - Lifetime EP0276751B1 (fr) 1987-01-24 1988-01-21 Dispositif pour remplir séparément des récipient de produits liquides

Country Status (4)

Country Link
US (1) US4915147A (fr)
EP (1) EP0276751B1 (fr)
DE (2) DE3702109C1 (fr)
ES (1) ES2018856B3 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4957147A (en) * 1987-10-01 1990-09-18 Lowe Terry B Container filling apparatus
DE3901773A1 (de) * 1989-01-21 1990-07-26 Mann & Hummel Filter Absperrvorrichtung fuer foerdereinrichtungen, insbesondere fuer schuettgueter
FR2659418B1 (fr) * 1990-03-09 1992-07-10 Fmc Europe Installation de connexion selective temporaire a entrees et sorties de fluide multiples.
FR2680559B1 (fr) * 1991-08-21 1993-11-26 Fmc Europe Sa Installation de connexion selective temporaire a entrees et sorties multiples.
DE19646595C2 (de) * 1996-11-12 1998-09-24 Alfill Engineering Gmbh & Co K Getränkefüllorgan mit ventilgesteuerten Leitungen
FR2781758B1 (fr) * 1998-07-29 2000-09-15 Hema Technologies Dispositif de distribution, notamment pour doseur de machine de remplissage, et doseur equipe d'un tel dispositif
ITPR20080017A1 (it) * 2008-03-12 2009-09-13 Lorenzo Campanini Procedimento ed apparato di riempimento in macchine riempitrici.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE736348C (de) * 1939-06-28 1943-06-12 Julius Frommherz Auslaufkolbenschieber
DE897499C (de) * 1951-12-11 1953-11-23 Otto Meyer Absperrorgan fuer gasfoermige und fluessige Medien
US2770397A (en) * 1953-10-05 1956-11-13 Fmc Corp Liquid measuring and dispensing apparatus
US2812919A (en) * 1952-09-02 1957-11-12 California Research Corp Drum filling machine
DE2141315A1 (de) * 1971-08-18 1973-03-29 Knapsack Ag Fuellanze und anlage zum befuellen von faessern mit fluessigem gelbem phosphor
US4406313A (en) * 1981-09-25 1983-09-27 Texaco Inc. Method and apparatus for filling discrete drums with a liquid

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US814169A (en) * 1904-03-16 1906-03-06 Filter & Brautechnische Maschinen Fabrik Act Ges Apparatus for decanting liquids.
US1071682A (en) * 1911-12-29 1913-09-02 William F Arzinger Bottle-filling and fluid-measuring machine.
US1820480A (en) * 1927-06-17 1931-08-25 Continental Can Co Brine supplying attachment for can closing machines
US2208028A (en) * 1938-12-10 1940-07-16 Bertie S Harrington Container filling apparatus
US2913016A (en) * 1957-06-17 1959-11-17 Paul E Luther Liquid filling system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE736348C (de) * 1939-06-28 1943-06-12 Julius Frommherz Auslaufkolbenschieber
DE897499C (de) * 1951-12-11 1953-11-23 Otto Meyer Absperrorgan fuer gasfoermige und fluessige Medien
US2812919A (en) * 1952-09-02 1957-11-12 California Research Corp Drum filling machine
US2770397A (en) * 1953-10-05 1956-11-13 Fmc Corp Liquid measuring and dispensing apparatus
DE2141315A1 (de) * 1971-08-18 1973-03-29 Knapsack Ag Fuellanze und anlage zum befuellen von faessern mit fluessigem gelbem phosphor
US4406313A (en) * 1981-09-25 1983-09-27 Texaco Inc. Method and apparatus for filling discrete drums with a liquid

Also Published As

Publication number Publication date
DE3702109C1 (de) 1988-08-25
US4915147A (en) 1990-04-10
EP0276751B1 (fr) 1990-12-27
DE3861381D1 (de) 1991-02-07
ES2018856B3 (es) 1991-05-16

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