EP0153440A1 - Four de maintien et/ou four de fusion avec distributeur doseur pour métaux non ferreux - Google Patents

Four de maintien et/ou four de fusion avec distributeur doseur pour métaux non ferreux Download PDF

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Publication number
EP0153440A1
EP0153440A1 EP84107319A EP84107319A EP0153440A1 EP 0153440 A1 EP0153440 A1 EP 0153440A1 EP 84107319 A EP84107319 A EP 84107319A EP 84107319 A EP84107319 A EP 84107319A EP 0153440 A1 EP0153440 A1 EP 0153440A1
Authority
EP
European Patent Office
Prior art keywords
chamber
furnace
metal melt
metering chamber
metering
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
EP84107319A
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German (de)
English (en)
Other versions
EP0153440B1 (fr
Inventor
Gerhard Bleickert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19843406467 external-priority patent/DE3406467A1/de
Application filed by Individual filed Critical Individual
Priority to AT84107319T priority Critical patent/ATE34106T1/de
Publication of EP0153440A1 publication Critical patent/EP0153440A1/fr
Application granted granted Critical
Publication of EP0153440B1 publication Critical patent/EP0153440B1/fr
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D39/00—Equipment for supplying molten metal in rations
    • B22D39/02—Equipment for supplying molten metal in rations having means for controlling the amount of molten metal by volume
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D39/00—Equipment for supplying molten metal in rations
    • B22D39/06—Equipment for supplying molten metal in rations having means for controlling the amount of molten metal by controlling the pressure above the molten metal

Definitions

  • the present invention relates to a holding and / or melting furnace for non-ferrous metals according to the preamble of claim 1 .
  • Such furnaces are generally used to scoop out a certain amount of the relevant non-ferrous metal melt and to lead it to a die casting machine.
  • the predetermined amount to be removed depends on the size of the casting to be produced in the die casting machine.
  • the metering chamber is suspended from one lever arm of a beam of a weighing device and a separate closing element with a drive is provided.
  • This arrangement is relatively complicated in terms of structure and complex with regard to the components used.
  • the object of the present invention is to provide a furnace for non-ferrous metals of the type mentioned at the outset, which is of a simpler construction.
  • a stationary metering chamber is used in a simple manner, so that moving parts are omitted directly in the furnace area, which in particular makes the metering device less susceptible to faults. Since the reciprocating closing piston also contains the compressed gas supply, the construction of the metering chamber in particular is simplified. Another advantage is that the non-ferrous metal melt can be removed from cheaper areas within the furnace, since the metering chamber can be arranged at the lowest point of the non-ferrous metal melt bath due to its fixed use.
  • the relatively small dosing chamber is always full, so that the bath level is always the same at the outlet, only small amounts of compressed gas are required and the dosing itself can be carried out extremely quickly.
  • the metering chamber is arranged integrated in the oven and forms part of an oven pan.
  • the dosing chamber can be provided in a simple manner at the same time as the furnace trough is being manufactured, and it can also be provided at the location which is most favorable for the operation, both with regard to the non-ferrous metal melt removal for metered delivery and with regard to that at the furnace intended pouring spout.
  • the integrated metering chamber open directly or indirectly through an inclined trough in a tapered pouring end of the furnace via an inclined riser pipe with a predetermined flow cross-section, so that the furnace can be brought close to the die-casting machine in question essentially without interposing conductive elements.
  • the metering chamber is as separate component inserted into the non-ferrous metal melt of a scoop chamber. This makes it possible to subsequently retrofit existing melting and / or holding furnaces with such a metering device, so that these furnaces can be made more effective.
  • Determining the amount to be dispensed to the die casting machine, i. H. their precise dosing can be controlled in a particularly simple manner by means of a time relay device which can be set to a specific time given a given flow cross section and a given gas pressure.
  • a time relay device which can be set to a specific time given a given flow cross section and a given gas pressure.
  • An inert gas such as nitrogen, is preferably used as the pressurized gas, which has the advantage that it is neutral towards the non-ferrous metal melt, in particular the AL melt.
  • the metering device 11, 111 and 111 ' according to the invention is used to supply a predetermined amount of a non-ferrous (molten) metal melt 14 from a holding furnace 12 or a combined melting-holding furnace 112 or 112' a die casting machine 13, 113 or 113 'to promote, in which this amount of non-ferrous metal melt is processed.
  • the metering device 11 can be used not only in connection with a holding furnace 12, but also with a melting furnace or with a combined melting / holding furnace.
  • the holding oven 12 shown in FIG. 1 has a housing 16 arranged on legs 17, in which a tub 15 with three chambers, which is well thermally insulated from the outside by means of a heat-resistant lining, namely a filling chamber 18, a holding chamber 19 and a Schö p f chamber 21 is arranged.
  • a cover 22 is arranged above the filling chamber 18 provided with a filling funnel 20 and the holding chamber 19, on the inside of which in the area above the holding chamber 19 there are arranged electrical heating elements for indirect heating of the non-ferrous metal melt 14.
  • a vertical partition or barrier 24 is arranged between the filling chamber 18 and the holding chamber 19, which is provided in an area near the trough bottom 33 with an opening 26, the cross section of which is considerably smaller than that of the trough 15 or scooping chamber 21. While the Barrier 24 except for the Floor extends and only leaves the narrow opening 26 free, a second partition or barrier 27 is provided between the warming chamber 19 and the scooping chamber 21, which is arranged under one end of the cover 22 in the form of a strip running across the trough 15, and whose free end edge is arranged at a certain distance from the bottom 33 of the chamber 19 or 21. This second barrier 27 is immersed in the non-ferrous metal melt 14 approximately up to half the depth of the trough or chamber.
  • the dosing device 11 with its conveying unit 31 is inserted or immersed in the scooping chamber 21 of the holding furnace 12.
  • the conveyor unit 31 has a housing 32, the base area of which is smaller than that of the scooping chamber 21, and which is seated on the bottom 33 'of the scooping chamber 21.
  • the height of the housing 32 which has an approximately pear-shaped base area according to FIG. 3, corresponds approximately to the depth of the scooping chamber 21.
  • the conveying unit 31 is loosely connected to a weighing device 34, which is provided with a tilting device 36 and via a collecting funnel 37 and an inclined pipeline 38 is connected to the die casting machine 13.
  • the metering device 11 consisting of the conveying unit 31, the weighing device 34 and the tilting device 36 is constructed as follows.
  • the housing 32 of the conveying unit 31, which consists of a high-quality refractory material, has in its lower area a metering or storage chamber 41 which is incorporated in the form of a large diameter bore and which on the bottom side has a transverse bore 42 with a rising or Exit bore 43 is connected, which exits the housing 32 at the upper end.
  • a guide bore 44 is provided concentrically with the storage chamber 41, which opens into the storage chamber 41 from the upper end of the housing 32 and in which a closing piston 4'6 is arranged to move back and forth or up and down according to double arrow A.
  • the closing piston 46 is moved back and forth in a manner not shown by a pneumatic drive device.
  • the closing piston 46 is a thick-walled tube which is provided with a conical taper at its front end, so that a nozzle-shaped mouthpiece 47 is provided.
  • a closing plate 48 is provided, which is annular and is held in the form of a lid on the storage chamber 41.
  • the annular locking plate 48 has an access opening 49 which can be closed by the nozzle mouthpiece 47 of the locking piston 46.
  • the inside diameter of the access opening 49 is somewhat larger than the smallest outside diameter of the nozzle mouthpiece 47, so that it can penetrate into the access opening 49 and close with its outer cone.
  • the locking piston 46 and the locking plate 48 are made of highly heat-resistant ceramic.
  • the through bore 51 in the closing piston 46 is connected to a pipeline 52 which is connected via a pressure regulator 53 to a pressure pump or a compressed air network, as is used in companies (FIG. 1).
  • inlet openings arranged in the form of horizontal slots 56 are provided in the housing 32 of the conveying unit 3i, which run radially inward from the outer circumference of the housing 32 and in the guide bore 44 open immediately above the locking plate 48.
  • these slots 56 are evenly distributed over the circular area of the outer circumference, while the tapering area of the pear-shaped peripheral shape is free of these slots.
  • the slots 56 are tapered from the outside inwards.
  • the vertically extending outlet bore 43 is connected at its end emerging from the housing 32 to a feed pipe 58 made of highly heat-resistant ceramic.
  • the feed tube 58 has a bend of more than 90 ° at its end region facing away from the outlet bore 43, in which bend region a ventilation opening 59 is arranged.
  • the free of the feed tube 58 is arranged above a weighing or receiving bowl 61 of the weighing device 34.
  • the receiving shell 61 is fastened about a horizontal axis 62 to a spring balance 63 which stands on the housing 32 and is fastened to it.
  • the spring balance 63 consists essentially of an upper and outer cylindrical part, to which the receiving shell 61 is attached, and a lower, inner cylindrical part, which is attached to the housing 32.
  • the upper, outer part coaxially overlaps the lower, inner part, an adjustable compression spring being arranged between the two, which determines the force which is to be exerted in order to move the upper, outer part downward over the lower, inner part.
  • the spring balance 63 or weighing device 34 can thus be adjusted with regard to the metering weight.
  • the spring balance 63 also has, in a manner not shown, two electrical contacts which can be moved relative to one another and which come into operative connection and interrupt the melt feed when the set metering weight has been reached.
  • the tiltable receiving tray 61 is provided at its one end with a pour spout 86 and opposite thereto with a Hebelge - strands on connected 87 whose other end is hinged to a pneumatic piston-cylinder unit 88, the fixed end of the cylinder 71 or 24 of the Weighing device 34 is attached.
  • the weighing device 34 is thus combined with the tilting device 36.
  • the collecting funnel 37 Arranged underneath the tiltable receiving shell 61 is the collecting funnel 37, the inclined bottom 92 of which is connected at the lower end to the pipeline 38, which is also inclined and opens into a filling funnel 94 in the die casting machine 13.
  • the combined melting and holding furnace 112 shown in FIG. 4 is provided with a metering device 111, which is provided with a metering or storage chamber 141 integrated in the furnace 112.
  • the melting / holding furnace for non-ferrous metal melt 114 has a housing 116 which is approximately cuboid over a substantial area and which tapers conically towards the pouring end 125 from the two side walls and from the bottom side.
  • the housing 116 is covered by a substantially rigid cover 128 which rises obliquely from the pouring end, to which, with the interposition of a seal 129, a substantially rectangular cover 122 is connected, which at an end of the housing 116 facing away from the pouring end 125 attached hinge 130 is articulated.
  • the one in Cross section of approximately L-shaped hinged cover 122 carries heating elements 123 on its underside over a certain area.
  • the furnace housing 116 has a well 115 which is well heat-insulated from the outside by means of a heat-resistant lining and which is provided with four chambers, namely with a filling chamber 118, which is at the same time the melting chamber for the introduced solid non-ferrous material, with a warming chamber 119 with which Dosing chamber 141 and with an intermediate chamber 121, which is connected on the one hand to the holding chamber 119 and on the other hand to the dosing chamber 141.
  • a vertical partition or barrier 124 is arranged between the filling or melting chamber 118 and the holding chamber 119, which has the shape of a strip running across the trough 115 and the lower free end edge thereof at a certain distance. is arranged from the bottom 133 of the chamber 118 or 119.
  • the warming chamber 119 facing away from the barrier 124, is partially covered by the second vertical partition or barrier 127 from the intermediate chamber 121 and completely by the dosing chamber 141 Cut.
  • the connection from the warming chamber 119 to the intermediate chamber 121 is provided by an opening 126 in the barrier 127, the cross section of which is considerably smaller than that of the trough 115 and which is arranged at the level of a partition wall 135, the top of which forms the bottom of the intermediate chamber 121.
  • the two barriers 124 and 127 are arranged with respect to the heating elements 123 arranged on the pivotable cover 121 in such a way that the heating elements 123 are arranged distributed over essentially the entire surface of the warming chamber 119 and partly over the surface of the intermediate chamber 121.
  • the partition 135 between the intermediate chamber 121 and the metering chamber 141 has a horizontal part 139, which is adjoined by an inclined part 140 which extends to the pouring end 125.
  • the metering chamber 141 is delimited by the horizontal part 139 of this partition 135, the opposite horizontal region of the tub floor and by the lower part of the vertical barrier 127 and by the corresponding side wall regions of the tub 115.
  • a riser pipe 143 is arranged, which leads from the inside of the metering chamber 141 to the pouring end 125 of the tub 115.
  • an access opening or hole / which represents a closable connection between the intermediate chamber 121 and the metering chamber 141.
  • This access opening 149 can be closed by a closing piston 146 in the form of a thick-walled tube with a through hole 151.
  • the closing piston or the tube 146 is passed through a through opening 154 in the rigid cover 128 and is mechanically connected on the one hand to a pneumatic drive device (not shown) for up and down movement according to double arrow A 'and on the other hand is coupled to a compressed air pipeline 152.
  • the tube 146 is slidably mounted in the rigid cover 128 but is nevertheless heat-insulating and is connected to one at its inner front end provided nozzle-shaped mouthpiece 147, which is given by a conical taper.
  • the dimensions of the mouthpiece 147 are such that, as shown in FIG. 5, it can close the access opening 149 from the intermediate chamber 121 to the metering chamber 141.
  • the closing piston 146 is made of highly heat-resistant ceramic.
  • the closing piston 146 is likewise connected via the pipeline 152 to a pressure regulator (not shown) and a pressure pump or a compressed air network, as is used in companies.
  • the preferably not shown pneumatic drive device for moving the closing piston 146 up and down and a shut-off valve in the compressed air supply line 152 are connected to a time relay, also not shown, such that when the access opening 149 is closed, according to FIG. 4, compressed air for metered delivery of NE -Metal melt is added and that after delivering a certain metered amount of melt, the compressed air is switched off and the closing piston 146 is raised, so that metal melt again from the Zwi Schenkhunt 121 can flow into the metering chamber 141.
  • this combined melting and holding furnace 112 with the metering device 111 is as follows: Because of the conical shape of the pouring end 125, the furnace 112 can be brought very close or directly to a filling funnel 194 of a die casting machine 113. With the access opening 149 opened by the closing piston 146, non-ferrous metal melt flows into the metering chamber 141. After closing the access opening 149, the metering chamber 141 is pressurized with compressed air by the closing piston 146, so that non-ferrous metal melt through the riser pipe 143 from the pouring end 125 into the Die casting machine funnel flows.
  • the compressed air supply is controlled in a time-dependent manner, that is to say the outlet amount is determined via a time relay (not shown) due to the known flow cross section and pressurized pressure.
  • the closing piston 146 is opened again so that the metering chamber 141 can be filled again. Since the metering chamber 141 is relatively small, the pressurization by means of compressed air can take place directly, ie without an upstream pressure container.
  • the melting and holding furnace 112 'shown in FIG. 5 is basically constructed in accordance with the melting and holding furnace 112 in FIG. 4 and essentially also functions like this.
  • the corresponding reference numbers have therefore been provided with a dash.
  • the furnace 112 'of FIG. 5 in relation to the furnace 112 of FIG. 4 will be discussed.
  • the bottom 133 2 , the metering chamber 141' is set lower than the common bottom 133 1 , the holding chamber 119 'and the filling chamber 118'. This makes it possible to completely empty the oven 112 '.
  • the opening 120 'between the filling chamber 118' and the holding chamber 119 'and the opening 126' between the holding chamber 119 ' and the intermediate chamber 121 ' are arranged relatively narrow and offset from one another in the direction of the width of the chambers.
  • the inflow opening 149 'from the intermediate chamber 147' to the metering chamber 141 ' is, as in the exemplary embodiment in FIG. 4, provided in a ceramic insert.
  • riser pipe 143 ' which starts from the metering chamber 141', is not led directly to the pouring end 125 ', but opens into an open channel 166 in front of it, which runs from the top of the tub into the aluminum-repellent refractory concrete. from which the furnace pan is made, is incorporated.
  • the riser pipe 143 ' is also only provided as a hole in the refractory concrete.
  • the open channel 166 runs from the exit end of the riser pipe 143 'downward to the pouring end 125'. In this way, the riser pipe 143 'is steeper than in the exemplary embodiment in FIG. 4.
  • the metering device 11, 1 'in the oven 112' according to FIG. 5 is essentially the same as the metering device 111 in the oven 112 in FIG. 4.
  • the sloping cover 128 ' is adapted to the furnace 112' insofar as it covers the open channel 166 to the outside in the closed state.
  • this sloping cover 128 ' has a sloping bore 167 which can be closed by means of a flap 168 and which is in an extended alignment with the riser pipe 143', so that the riser pipe 143 'can optionally be pierced from the outside.
  • the melting and holding furnace 112 ' also has an extension 161 which is provided with a filling funnel 162 which opens into the filling or melting chamber 118. In this way, liquid material can also be fed directly into the furnace 112 '.
  • the cover 122 ' is hinged on one of the long sides.
  • the metering chamber 141 is acted upon not by means of compressed air for the metered delivery of non-ferrous metal melt, but by means of nitrogen or another inert gas, which has the advantage that such gases oppose the non-ferrous metal melt, in particular against behave neutrally over an aluminum melt. Since the metering chamber 141 'is relatively small and is always substantially completely filled, only very little nitrogen or the like is required to dispense the molten metal, so that nitrogen bottles can advantageously be used.
  • an inert gas such as nitrogen can also be used in the exemplary embodiments in FIGS. 1 to 3 and in FIG. 4 instead of compressed air.
  • the metering device 11 according to FIGS. 1 to 3 can also be provided with a timing relay instead of the weighing device or the metering device 111 or 111 'can be provided with a weighing device instead of a timing relay.
  • sufficient heat insulation for example in the form of fiberboard, is provided in the furnace 12, 112, 112 'between the trough 115 and the housing 116 in a manner not shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP84107319A 1984-02-23 1984-06-20 Four de maintien et/ou four de fusion avec distributeur doseur pour métaux non ferreux Expired EP0153440B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84107319T ATE34106T1 (de) 1984-02-23 1984-06-20 Warmhalte- und/oder abschmelzofen fuer ne-metalle mit dosiereinrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843406467 DE3406467A1 (de) 1983-02-24 1984-02-23 Warmhalte- und/oder abschmelzofen fuer ne-metalle mit dosiereinrichtung
DE3406467 1984-02-23

Publications (2)

Publication Number Publication Date
EP0153440A1 true EP0153440A1 (fr) 1985-09-04
EP0153440B1 EP0153440B1 (fr) 1988-05-11

Family

ID=6228537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84107319A Expired EP0153440B1 (fr) 1984-02-23 1984-06-20 Four de maintien et/ou four de fusion avec distributeur doseur pour métaux non ferreux

Country Status (6)

Country Link
US (1) US4741514A (fr)
EP (1) EP0153440B1 (fr)
JP (1) JPS61500213A (fr)
AT (1) ATE34106T1 (fr)
DE (1) DE3471027D1 (fr)
WO (1) WO1985003656A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627274A1 (fr) * 1993-06-01 1994-12-07 INDUSTRIETECHNIK ALSDORF GmbH Dispositif de dosage d'un métal en fusion non-ferreux et procédé pour contrôler le dosage du métal en fusion
DE10121209B4 (de) * 2001-04-30 2004-02-05 Müller Weingarten AG Dosier- oder Chargieranlage

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6426037B1 (en) 1999-05-06 2002-07-30 John B. Fieber Dosing chamber method and apparatus
AU2003241746A1 (en) * 2002-05-31 2003-12-19 Hoei Shokai Co., Ltd. Container capable of transporting molten metal received therein to separate factory and method of producing the container
DE10234532B4 (de) * 2002-07-30 2006-01-05 Müller Weingarten AG Druckgussverfahren für Horizontalkaltkammer-Druckgießmaschine und Druckgießmaschine
US8303890B2 (en) * 2007-02-23 2012-11-06 Alotech Ltd. Llc Integrated quiescent processing of melts
TW201408398A (zh) * 2012-08-23 2014-03-01 游家龍 供應鋁合金熔融液的方法及裝置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1289845A (fr) * 1960-08-03 1962-04-06 Dispositif destiné à distribuer et transférer des quantités dosées de liquides ou matières fondues, d'un récipient jusqu'à l'endroit d'utilisation
GB917298A (en) * 1959-09-08 1963-01-30 Lindberg Eng Co Improvements relating to furnace ladling apparatus
DE1250606B (fr) * 1967-09-21
FR1575148A (fr) * 1967-08-18 1969-07-18
DE1758337A1 (de) * 1965-08-24 1972-03-30 Kraft Industrieofenbau Gmbh Verschluss fuer eine Giessvorrichtung
FR2105268A1 (fr) * 1970-09-04 1972-04-28 Gravicast Patent Gmbh
US3708088A (en) * 1970-11-20 1973-01-02 Albany Int Corp Apparatus for metering liquid flow discharge
DE2254946A1 (de) * 1971-11-18 1973-05-24 Asea Ab Anordnung zur automatischen dosierungskontrolle beim abgiessen aus giessoefen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2058378A (en) * 1935-03-29 1936-10-20 Intertype Corp Metal pot for line casting machines

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1250606B (fr) * 1967-09-21
GB917298A (en) * 1959-09-08 1963-01-30 Lindberg Eng Co Improvements relating to furnace ladling apparatus
FR1289845A (fr) * 1960-08-03 1962-04-06 Dispositif destiné à distribuer et transférer des quantités dosées de liquides ou matières fondues, d'un récipient jusqu'à l'endroit d'utilisation
DE1758337A1 (de) * 1965-08-24 1972-03-30 Kraft Industrieofenbau Gmbh Verschluss fuer eine Giessvorrichtung
FR1575148A (fr) * 1967-08-18 1969-07-18
FR2105268A1 (fr) * 1970-09-04 1972-04-28 Gravicast Patent Gmbh
US3708088A (en) * 1970-11-20 1973-01-02 Albany Int Corp Apparatus for metering liquid flow discharge
DE2254946A1 (de) * 1971-11-18 1973-05-24 Asea Ab Anordnung zur automatischen dosierungskontrolle beim abgiessen aus giessoefen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627274A1 (fr) * 1993-06-01 1994-12-07 INDUSTRIETECHNIK ALSDORF GmbH Dispositif de dosage d'un métal en fusion non-ferreux et procédé pour contrôler le dosage du métal en fusion
DE10121209B4 (de) * 2001-04-30 2004-02-05 Müller Weingarten AG Dosier- oder Chargieranlage

Also Published As

Publication number Publication date
JPS6232020B2 (fr) 1987-07-11
WO1985003656A1 (fr) 1985-08-29
ATE34106T1 (de) 1988-05-15
JPS61500213A (ja) 1986-02-06
EP0153440B1 (fr) 1988-05-11
US4741514A (en) 1988-05-03
DE3471027D1 (en) 1988-06-16

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