EP0297201A1 - Dispositif d'amenée d'éléments longitudinaux coupés à une certaine longueur à une soudeuse de treillis - Google Patents

Dispositif d'amenée d'éléments longitudinaux coupés à une certaine longueur à une soudeuse de treillis Download PDF

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Publication number
EP0297201A1
EP0297201A1 EP87890152A EP87890152A EP0297201A1 EP 0297201 A1 EP0297201 A1 EP 0297201A1 EP 87890152 A EP87890152 A EP 87890152A EP 87890152 A EP87890152 A EP 87890152A EP 0297201 A1 EP0297201 A1 EP 0297201A1
Authority
EP
European Patent Office
Prior art keywords
compartments
magazine
longitudinal elements
cross conveyor
welding machine
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
EP87890152A
Other languages
German (de)
English (en)
Other versions
EP0297201B1 (fr
Inventor
Rudolf Dipl.-Ing. Scherr
Klaus Dipl.-Ing. Ritter
Gerhard Dr. Dipl.-Ing. Ritter
Josef Dr. Dipl.-Ing. Ritter
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.)
EVG Entwicklungs und Verwertungs GmbH
Original Assignee
EVG Entwicklungs und Verwertungs 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 EVG Entwicklungs und Verwertungs GmbH filed Critical EVG Entwicklungs und Verwertungs GmbH
Priority to AT87890152T priority Critical patent/ATE64702T1/de
Priority to DE8787890152T priority patent/DE3771074D1/de
Priority to EP87890152A priority patent/EP0297201B1/fr
Priority to US07/071,016 priority patent/US4848560A/en
Publication of EP0297201A1 publication Critical patent/EP0297201A1/fr
Application granted granted Critical
Publication of EP0297201B1 publication Critical patent/EP0297201B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F27/00—Making wire network, i.e. wire nets
    • B21F27/08—Making wire network, i.e. wire nets with additional connecting elements or material at crossings
    • B21F27/10—Making wire network, i.e. wire nets with additional connecting elements or material at crossings with soldered or welded crossings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F23/00—Feeding wire in wire-working machines or apparatus
    • B21F23/005—Feeding discrete lengths of wire or rod

Definitions

  • the invention relates to a device for feeding cut longitudinal elements to the entrance of a grid welding machine, with an endless cross conveyor projecting over the welding machine entrance, which receives the longitudinal elements laterally from the welding machine entrance in open parallel compartments and transversely to their longitudinal extent via the upper run, a deflection point and promotes a part of the lower run of the cross conveyor into the area of the welding machine entrance, where a group of longitudinal elements is released by means of an initially closing but lowerable section of the compartments on the lower run of the cross conveyor, whereupon the longitudinal elements are released into the welding machine by a longitudinal conveyor be promoted.
  • a device of this type is known from DE-B-23 19 003.
  • the continuous endless cross conveyor has on its entire circumference directly adjacent open receiving compartments which are fed with longitudinal elements in the upper run of the conveyor.
  • the filled compartments pass through a deflection point covered by guide elements to the underside of the rotating cross conveyor, where the longitudinal elements are initially held in the compartments by the raised branch and then released together in a predetermined number by lowering the branch, and finally by means of a longitudinal conveyor into the Welding machine to be introduced.
  • the disadvantage of this device is that the cross conveyor not only has to be stopped until the longitudinal elements have been released by the cuttings, but also until the released longitudinal elements have been conveyed from a tray into the welding machine and the cantilever can be raised again so that it can prevent the longitudinal elements contained in the following compartments of the cross conveyor from prematurely escaping from the compartments.
  • the subsequent continuous or gradual further movement of the cross conveyor can only take place at the moderate speed still permissible for loading the empty compartments with longitudinal elements, so that the productivity of the overall system is relatively low.
  • Another disadvantage of the known device is that, apart from a selective filling of the receiving compartments in the upper run of the endless cross conveyor, there is no possibility of changing the pitch of the longitudinal elements of the grid.
  • a device for feeding longitudinal wires to a grid welding machine in which a continuous endless cross conveyor is also used, which has directly adjacent open receiving compartments for the longitudinal elements on its entire circumference, but in which the Longitudinal elements are lifted off the upper run of the cross conveyor.
  • a transport carriage can be moved in the transverse direction, which, by means of lifting disc rollers, lifts the longitudinal elements out of the open compartments in the upper run of the cross conveyor, then moves them transversely to their longitudinal extension to the welding machine entrance and finally introduces them into the welding machine by rotating the disc rollers.
  • a guide device for the longitudinal elements also designed as a disc roller, the mutual spacing of the discs of this roller being adjustable so that the division of the longitudinal elements in the grid to be produced can be changed.
  • This device not only requires considerable design effort, but also has the disadvantages that the trolley in the welding machine entrance must be stopped until all the wires have been removed from it in the longitudinal direction, and that a rapid return movement in view of this waiting time of the trolley the same to the cross conveyor for the purpose of taking up new longitudinal wires and a rapid movement thereof towards the welding machine entrance is necessary in order to avoid or to keep the breaks between the individual feeding of the welding machine with longitudinal wires as short as possible. Nevertheless, such breaks, in which large masses have to be moved quickly, limit the productivity of the overall system, at least when processing short longitudinal wires.
  • DE-A-20 51 354 which is in addition to DE-A-1 456 661, it is proposed not to prevent the long waiting time of the trolley in the welding machine entrance, the longitudinal conveyor used to feed the longitudinal wires supplied by the trolley into the welding machine movable on the trolley, but stationary in the welding machine entrance and lifting the longitudinal wires from the trolley by means of an offshoot and placing them on the longitudinal conveyor, so that the trolley can return to the loading position at the cross conveyor after it has been emptied and before processing the longitudinal wires supplied by it.
  • the overall structure of the system is considerable in view of the need for both a cross conveyor and a transport vehicle and the need for separate control devices, and the requirements for the transport vehicle drive continue to be due to the long Running distance of the empty trolley in one or the loaded trolley in the other movement direction, especially if relatively short longitudinal wires are to be processed, can be managed considerably or no longer with reasonable effort.
  • the invention is now concerned with the task of designing a longitudinal element feed device for the type specified in the introduction, in which the longitudinal elements are released from the lower run of the cross conveyor, for increasing the productivity with as little effort as possible in such a way that the previously to release the longitudinal elements A deposit in the welding machine entrance and for conveying the released longitudinal elements from the deposit into the welding machine by means of the longitudinal conveyor, the downtime or waiting time of the cross conveyor required can be largely reduced, in particular also when the distances between the longitudinal elements located on the depository by moving them parallel to perfect and thereby a time-consuming manner should be changeable before conveying these elements into the welding machine.
  • a plurality of, preferably three, magazines formed from closely adjacent receiving compartments for groups of longitudinal elements are formed at the same mutual distance on the circumference of the endless cross conveyor, the mutual spacing of these magazines at least equal to the width of the same is that the feeder can be lowered each time a filled magazine enters the area of the welding machine entrance with a brief shutdown of the endless cross conveyor in order to empty the magazine in question, and that the cross conveyor immediately after this magazine emptying with that for loading the Compartments of another magazine permissible speed can be switched on, with a filled magazine following the empty magazine at a distance, preferably at increased speed, only entering the area of the welding machine inlet after the deposit in the raised position during a loading break.
  • a magazine filled in an earlier work cycle is emptied during a brief standstill of the cross conveyor, whereupon the cross conveyor is moved further at a speed which makes it possible to load longitudinal elements into a magazine emptied in the previous work cycle.
  • a fanless section of the cross conveyor moves over the entrance area of the welding machine, so that premature exit of longitudinal elements from the cross conveyor is not possible.
  • a magazine that has already been filled in a previous work cycle can be quickly moved into the entrance area of the welding machine while emptying the cross conveyor for emptying, while at the same time a fanless section of the cross conveyor moves past the loading point. In this way, the time required for a work cycle can be optimally used to load the compartments of the cross conveyor, thus increasing productivity.
  • the spacing of the compartments of the magazines of the cross conveyor can be changed in cycles and a constructively predetermined minimum value.
  • FIG. 1 two devices 1, 2 can be seen for loading a continuous endless cross conveyor 3 with straight sections of length 16 which have been drawn off from material bundles, not shown, and which are intended to form the longitudinal elements of a grid to be produced.
  • the cross conveyor 3 consists essentially of endless chains 5, which are stretched between rollers 6 and 7, one of the rollers, preferably the feed roller 6, being a drive roller.
  • the chains can be put into circulation by known means, such as an electric motor, in the direction of arrow P1.
  • Magazines 8 in the form of compartments 9 for receiving individual longitudinal elements 16 are arranged along the cross conveyor 3. All magazines 8 comprise an equal number of compartments 9 and all compartments within all magazines are arranged at equal mutual distances and have the same width, so that the overall width of all magazines 8 is also the same size.
  • Each magazine 8 has the same distance A from its neighboring magazines, this mutual distance between the magazines being at least as large as the total width of an individual magazine, but preferably somewhat larger than this value.
  • three magazines 8 of compartments 9 which can be distinguished by indices a, b and c are provided, the width and mutual arrangement of which along the chains 5 are selected such that when the initial compartment of the magazine 8a is exactly opposite a sliding guide 15 of the loading device 1, over which a cut to length element 16 can be fed from the loading device into the mentioned starting compartment, all the compartments of the third magazine 8c over a stationary storage magazine 4 to be described in more detail at the end of the loading device 1, 2 facing away Cross conveyor 3 are.
  • the second magazine 8b assumes a central or standby position with compartments already loaded with longitudinal elements, as can be seen from FIG.
  • two longitudinal elements 16 can be fed simultaneously into two adjacent compartments 9 of a magazine 8 of the cross conveyor 5.
  • the cross conveyor can then be switched intermittently by two intervals; however, the loading devices 1 and 2 can also be designed so as to be pivotable about axes 17, 18, so that it is possible to limit the sliding guides 15 with the compartments 9 moving during the chain rotation at a uniform speed, and thus loading the compartments 9 to effect with longitudinal elements 16 with continuously moving chain 5.
  • the cross conveyor 3 is pivotally mounted about the axis of the roller 6 and can be pivoted for example with the aid of hydraulic cylinders 19 in the direction of the double arrow P2.
  • the end of the cross conveyor 3 located at the roller 7 can be pivoted from the position shown in FIG. 1, adjacent to the storage magazine 4, into a position, not shown, remote from this magazine, in order to make room for the ancestors of a longitudinal conveyor to be described later .
  • the cross conveyor has coaxially arranged with the rollers 7, only shown in Figure 1 guide plates 20, which prevent that when moving a magazine 8 of compartments around the roller 7, the longitudinal elements resting in the compartments prematurely slide out of these.
  • the stationary storage magazine 4 has the same Number of compartments 30 as each magazine 8 of the cross conveyor 5, but the mutual spacing of the compartments 30 can be changed.
  • each compartment 30 lies exactly opposite a compartment 9 of a magazine 8 of the cross conveyor 3. With this aligned relative position of the compartments, the longitudinal elements 16 can be lowered from the compartments 9 into the compartments 30.
  • the compartments 30 can then be moved continuously to change the mutual distance of the longitudinal elements 16 in the sense of the double arrows P3 in FIGS. 1 and 2 into an extremely adjacent position according to FIG. 2 and out of this back into the receiving position according to FIG. 1.
  • all of the compartments 30 are displaceably guided on support rails 32 except for one of the rollers 31 indicated only in FIG. 4, the support rails 32 extending transversely to the longitudinal extent of the compartments 30 over the entire width of the storage magazine.
  • graduated changes in the spacing of the longitudinal elements 16 can be achieved by selective loading of corresponding compartments of the magazines 8.
  • the central compartment of the storage magazine 4 i.e. the compartment that is located in the plane of symmetry thereof, is rigid and immovable with the support rails 32 connected.
  • the groups of subjects mentioned have an even number of subjects 9 or 30, as was assumed in FIG. 5, then one of the two subjects 30 adjacent to the plane of symmetry XX of the storage magazine 4 is designated 30a in FIG , rigidly and immovably connected to the mounting rails 32, which in this case must also be displaceable in the sense of the double arrow P4.
  • the largest possible shift distance of a subject on the support rails 32 is equal to half the difference between the maximum and the minimum distance between adjacent compartments 30, which is indicated in FIGS. 1 and 5 by the arrows P5.
  • the compartment 30a is moved between two limit positions, the distance from the plane of symmetry XX of which is at most half the largest or at least half the smallest mutual distance between adjacent compartments 30.
  • Each of the compartments 30 is rigidly connected to a bolt 33 which slidably passes through one of the neighboring compartments and, beyond this neighboring compartment, has a thickened head part 34 which limits the movement of the two compartments connected by the bolt 33.
  • the bolts 33 of adjacent compartments are offset from one another perpendicular to the plane of the drawing in FIG. They form tie rods, which make it possible to either push two adjacent compartments up to mutual contact or move them apart until the head part 34 of a tie rod 33 moves the neighboring compartment with the movement of the compartment to which the tie rod 33 is rigidly connected , takes away.
  • Each of the two edge compartments 30b, 30c is connected to a strand of circumferential, endless chains 35, 36 - only the chains 35 are shown in FIG. 4 for the sake of clarity.
  • the chains can be driven by motors 37, 38 (FIG. 3) and thus in turn move the edge compartments 30b, 30c in the sense of the double arrows P6.
  • the transmission of the movement from the motors 37, 38 to the chains 35, 36, as well as the transmission of the movement between the groups of chains 35, 36 arranged parallel to one another at intervals, is carried out by means of separate transmission chains 45, 46 - or drive rollers 47, 48, 49.
  • spacers 51 are non-rotatably, but longitudinally displaceable, which have spacers 52 of different thicknesses attached near their circumference.
  • spacers 53 according to FIG. 6 can also be provided, one end face of which forms a ramp 54 in the form of a screw surface. This enables a continuous selection of the mutual distances between the compartments 30 and thus the distance between the longitudinal elements in the finished grid.
  • each compartment 30 is preferably provided with a stop bolt which interacts with the screw surface 54.
  • the middle spacer disk that is to say that which is located in the plane of symmetry XX of the magazine, is rigidly and immovably arranged on the shaft 50 and can therefore also Limit the path of the compartments on the mounting rails 32 by abutting the compartments on the compartment 30a rigidly connected to these rails in the direction of the axis of symmetry mentioned. Since the mounting rails 32 have only small displacement distances, they can be driven, for example, by a hydraulic cylinder, not shown.
  • each compartment 30 lies opposite a compartment 9 of a magazine 8 of the cross conveyor 3
  • the chains 35 and 36 are actuated by the motors 37, 38 in such a way that the edge compartments 30b, 30c are pulled outwards.
  • the tie rods 33 of all compartments progressively grasp the respective neighboring compartment from the edge towards the center and drag it along until all head parts 34 of the tie rods 33 prevent further movement of the compartments.
  • the spacers 51 engaging between adjacent compartments 30 are also dragged along the shaft 50 during this movement.
  • spacers of selected thickness can be pivoted into the space between adjacent compartments, which then determine the mutual compartment spacing during the subsequent movement of the compartments in the opposite direction.
  • the compartments 30 of the storage magazine 4 have openings 60 arranged at intervals in their longitudinal extension. These openings 60 are in the transverse to Longitudinal extension of the compartments 30 running alignments.
  • Support rollers 61 which can be adjusted in height in the direction of the double arrows P8 in FIG. 4 by known means, such as hydraulic cylinders, which are not shown in detail, penetrate these openings and extend transversely across the entire width of the longitudinal conveyor 4
  • Support rollers 61 can limit the effective depth of the compartments 30 in accordance with the dimensions of the longitudinal elements 16 to be fed to the grid welding machine.
  • the support rollers 61 are first brought into a position in which the free depth of the compartments 30 corresponds to the height of the longitudinal elements 16 to be fed to the welding machine (cf. FIG. 5).
  • the chains 5 can now immediately resume their movement, and at the same time the loading of the compartments 9 of the magazine 8c now lying in the region of the slide guides 15 can begin with longitudinal elements 16. Furthermore, the compartments 30 of the storage magazine which take their greatest mutual distance during the transfer process can be brought to the distance at which the longitudinal elements 16 are fed to the grid welding machine by the motors 37, 38 by means of the chains 35, 36 and with the cooperation of the spacers 51 and 53, respectively and are to be welded by this with cross wires.
  • feed elements 74 are freely displaceable along this support, as shown in FIG. 5, each of which is in permanent engagement with one of the magazine compartments 30 and which can therefore follow any change in the distance between the compartments 30.
  • an intermediate storage 75 is preferably provided between the welding machine, which is no longer shown, which is not the subject of this invention, and the storage magazine 4.
  • This intermediate storage 75 likewise has compartments which are completely the same as the compartments 30 of the storage magazine 4 and can also be adjusted to different mutual distances by chains and spacers. However, these compartments are not adjusted cyclically and mechanically, but by hand and only at the start of the production of a certain type of grid, if the feed elements and the welding electrodes of the grid welding machine are also adjusted to the desired spacing of the longitudinal grid elements.
  • the cross conveyor 3 by means of the hydraulic cylinder 19 around the Axis of the roller 6 pivoted upwards so far that the feed carriage 72 can pass underneath the cross conveyor 3.
  • the cross conveyor 3 remains functional even in its raised position and can also in this Position of the loading device 1, 2 are loaded with longitudinal elements 16.
  • the feed carriage 72 pushes the front ends of the longitudinal elements 16, passing under the swiveled-over transverse conveyor 3, through the intermediate storage device 75 into the grid welding machine until they reach the area of the welding electrodes. At this time, the rear ends of the longitudinal elements 16 can still rest in the ends of the compartments 30 of the storage magazine 4 adjacent to the intermediate storage 75.
  • the motors 37, 38 can be activated again to bring the compartments 30 back to their largest via the chain transmissions 35, 36, 45, 46 mutual distance apart, whereupon the deposit 62-64 can be raised and the starting position shown in Figure 1 for the transfer of new longitudinal elements from a magazine 8 of the cross conveyor 3 to the storage magazine 4 is reached.
  • the "longitudinal elements" to be fed with the device according to the invention can either have a rod shape, as in normal lattice welding machines, or the shape of flat strips, such as in lattice grating welding machines, which weld cross bars into the flat strips.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Attitude Control For Articles On Conveyors (AREA)
  • Making Paper Articles (AREA)
  • Specific Conveyance Elements (AREA)
  • Wire Processing (AREA)
EP87890152A 1987-07-03 1987-07-03 Dispositif d'amenée d'éléments longitudinaux coupés à une certaine longueur à une soudeuse de treillis Expired - Lifetime EP0297201B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT87890152T ATE64702T1 (de) 1987-07-03 1987-07-03 Vorrichtung zum zufuehren von abgelaengten laengselementen zum eingang einer gitterschweissmaschine.
DE8787890152T DE3771074D1 (de) 1987-07-03 1987-07-03 Vorrichtung zum zufuehren von abgelaengten laengselementen zum eingang einer gitterschweissmaschine.
EP87890152A EP0297201B1 (fr) 1987-07-03 1987-07-03 Dispositif d'amenée d'éléments longitudinaux coupés à une certaine longueur à une soudeuse de treillis
US07/071,016 US4848560A (en) 1987-07-03 1987-07-08 Feeding apparatus for grid welding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87890152A EP0297201B1 (fr) 1987-07-03 1987-07-03 Dispositif d'amenée d'éléments longitudinaux coupés à une certaine longueur à une soudeuse de treillis

Publications (2)

Publication Number Publication Date
EP0297201A1 true EP0297201A1 (fr) 1989-01-04
EP0297201B1 EP0297201B1 (fr) 1991-06-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87890152A Expired - Lifetime EP0297201B1 (fr) 1987-07-03 1987-07-03 Dispositif d'amenée d'éléments longitudinaux coupés à une certaine longueur à une soudeuse de treillis

Country Status (4)

Country Link
US (1) US4848560A (fr)
EP (1) EP0297201B1 (fr)
AT (1) ATE64702T1 (fr)
DE (1) DE3771074D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5182932A (en) * 1989-09-20 1993-02-02 Evg Entwicklungs-U Verwertungs-Gesellschaft M.B.H. Apparatus for bending steel bars to form concrete reinforcement elements
AT404910B (de) * 1993-07-07 1999-03-25 Evg Entwicklung Verwert Ges Anlage zum zuführen von längselementen zu einer schweissmaschine
ES2338516A1 (es) * 2008-11-06 2010-05-07 Manuel Fuertes Rodriguez Maquina perfeccionada para la formacion de armaduras para hormigon.

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US6888319B2 (en) * 2001-03-01 2005-05-03 Palomar Medical Technologies, Inc. Flashlamp drive circuit
US20070095006A1 (en) * 2005-11-01 2007-05-03 Konersmann Ronald D Lightweight portable concrete enclosure and associated method of construction
GR1007035B (el) * 2009-07-22 2010-10-27 Αντωνιος Παναγιωτη Αναγνωστοπουλος Μεθοδος και συστημα τροφοδοσιας ηλεκτροσυγκολλητικων μηχανων παραγωγης πλεγματος με διαμηκη συρματα
GR1008523B (el) 2014-04-01 2015-07-09 Αντωνιος Παναγιωτη Αναγνωστοπουλος Μεθοδος και συστημα τροφοδοσιας διαμηκων συρματων ή μπετοβεργων σε μηχανηματα παραγωγης πλεγματος

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DE2051354B2 (de) * 1970-10-20 1973-03-29 Lichtgitter-Gesellschaft Mbh, 4424 Stadtlohn Vorrichtung zum zufuehren von laengsdraehten zu gitterschweissmaschinen
DE2319003B2 (de) * 1973-04-14 1976-04-22 Fels-Werke Peine-Salzgitter Gmbh, 3380 Goslar Vorrichtung zum zufuehren von laengsdraehten zu gitterschweissmaschinen

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DE1456661B2 (de) * 1966-12-07 1971-08-15 Lichtgitter Gesellschaft mbH, 4424 Stadtlohn Vorrichtung zum zufuehren von laengsdraehten zu gitter schweissmaschinen
DE2051354B2 (de) * 1970-10-20 1973-03-29 Lichtgitter-Gesellschaft Mbh, 4424 Stadtlohn Vorrichtung zum zufuehren von laengsdraehten zu gitterschweissmaschinen
DE2319003B2 (de) * 1973-04-14 1976-04-22 Fels-Werke Peine-Salzgitter Gmbh, 3380 Goslar Vorrichtung zum zufuehren von laengsdraehten zu gitterschweissmaschinen

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5182932A (en) * 1989-09-20 1993-02-02 Evg Entwicklungs-U Verwertungs-Gesellschaft M.B.H. Apparatus for bending steel bars to form concrete reinforcement elements
AT404910B (de) * 1993-07-07 1999-03-25 Evg Entwicklung Verwert Ges Anlage zum zuführen von längselementen zu einer schweissmaschine
ES2338516A1 (es) * 2008-11-06 2010-05-07 Manuel Fuertes Rodriguez Maquina perfeccionada para la formacion de armaduras para hormigon.
WO2010052353A1 (fr) * 2008-11-06 2010-05-14 Fuertes Rodriguez Manuel Machine perfectionnée pour la formation d'armatures pour béton

Also Published As

Publication number Publication date
EP0297201B1 (fr) 1991-06-26
DE3771074D1 (de) 1991-08-01
US4848560A (en) 1989-07-18
ATE64702T1 (de) 1991-07-15

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