EP0205723B1 - Fahrbare Gleisbearbeitungsmaschine und Verfahren zum Biegen der Schienenenden verlegter Gleise im Bereich der Stossstellen - Google Patents

Fahrbare Gleisbearbeitungsmaschine und Verfahren zum Biegen der Schienenenden verlegter Gleise im Bereich der Stossstellen Download PDF

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Publication number
EP0205723B1
EP0205723B1 EP85890146A EP85890146A EP0205723B1 EP 0205723 B1 EP0205723 B1 EP 0205723B1 EP 85890146 A EP85890146 A EP 85890146A EP 85890146 A EP85890146 A EP 85890146A EP 0205723 B1 EP0205723 B1 EP 0205723B1
Authority
EP
European Patent Office
Prior art keywords
rail
lifting
bending
machine
track
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
EP85890146A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0205723A1 (de
Inventor
Josef Ing. Theurer
Friedrich Peitl
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.)
Franz Plasser Bahnbaumaschinen Industrie GmbH
Original Assignee
Franz Plasser Bahnbaumaschinen Industrie 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 Franz Plasser Bahnbaumaschinen Industrie GmbH filed Critical Franz Plasser Bahnbaumaschinen Industrie GmbH
Priority to EP85890146A priority Critical patent/EP0205723B1/de
Priority to AT85890146T priority patent/ATE37212T1/de
Priority to DE8585890146T priority patent/DE3564975D1/de
Priority to HU861572A priority patent/HU195548B/hu
Priority to US06/858,108 priority patent/US4744302A/en
Priority to SU864027450A priority patent/RU1788994C/ru
Priority to CA000508973A priority patent/CA1258223A/en
Priority to AU58251/86A priority patent/AU577469B2/en
Priority to DD86291410A priority patent/DD247476A5/de
Priority to CS864782A priority patent/CS266335B2/cs
Priority to JP61151321A priority patent/JPS6210304A/ja
Publication of EP0205723A1 publication Critical patent/EP0205723A1/de
Application granted granted Critical
Publication of EP0205723B1 publication Critical patent/EP0205723B1/de
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B31/00—Working rails, sleepers, baseplates, or the like, in or on the line; Machines, tools, or auxiliary devices specially designed therefor
    • E01B31/02—Working rail or other metal track components on the spot
    • E01B31/08—Bending, e.g. for straightening rails or rail joints
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S72/00—Metal deforming
    • Y10S72/702—Overbending to compensate for springback

Definitions

  • the invention relates to a mobile track processing machine, in particular tamping and straightening machine, with a device for bending the ends of rails installed in the area of butt joints, consisting of at least one support frame arranged above the rail and height-adjustable to the machine frame, with the end areas extending in the machine longitudinal direction arranged and can be placed against the top of the rail, designed as a hydraulically height-adjustable pressure plunger abutments and a central, pincer-like lifting tool designed to engage the rail.
  • This consists of a support frame guided on the track by two spaced-apart undercarriages, which can be adjusted to the machine frame by means of height adjustment drives.
  • a pliers-like or hook-like lifting tool for engaging the rail is provided, which is designed to be height-adjustable by means of a cylinder-piston drive for lifting the rail ends.
  • a height-adjustable holding roller which can be mechanically blocked by a fixing or locking device, is arranged on both sides of the lifting tool on the supporting frame.
  • a control device that can be set with the desired bending value and a scale designed as a measured value transducer and arranged on the support frame with a feeler element resting on the rail joint are provided.
  • the holding rollers lying on the rail ends are lifted, with the transducer detuned, together with the sensing element, until the signal emitted by the transducer matches the preset target value.
  • the entire bending process is expediently carried out in a single operation.
  • a mobile tamping machine of the type mentioned in the preamble of claim 1 with a device for bending the rail ends in the region of butt joints is known.
  • This consists of a height-adjustable support frame hinged to the machine frame, at the longitudinal ends of which an abutment is arranged in the form of a hydraulic pressure cylinder with downward-facing pressure stamps which can be placed on the rail running surface.
  • a lifting tool designed as a lifting hook for engaging below the rail foot and pivotable transversely to the machine longitudinal direction is provided, which is mounted in a vertically adjustable slot in an indentation of the support frame open to the outside of the machine in a vertical guide slot for swiveling out and in.
  • the lifting hook is additionally guided via a bolt in a further, partially curved guide slot and is connected in the region of its lower end to a hydraulic cylinder supported on the support frame for lateral pivoting.
  • a flanged roller that can be unrolled on the rail head and a pair of lifting rollers on the supporting frame are arranged so that the known device can also be used as a track lifting / straightening unit for lifting and straightening the track into the desired position.
  • the lifting hook is swung in sideways under the foot of the rail held by the pairs of lifting rollers and the plunger of each abutment is lowered onto the rail travel surface.
  • the size of the bending moment effective in the vertical longitudinal plane of the rail can be individually changed by adjusting the height of the pressure stamp.
  • Rail joints that are very deeply retracted are further advantageously bent up to the level of the other rails or rails.
  • This known device for the relatively new technology of rail butt bending of installed rails has already proven itself in use.
  • the attack of the lifting hook under the rail foot is disadvantageous, since the sleeper compartment often has to be cleared of ballast in order to create enough space for the lifting hook attack.
  • the object of the invention is to provide a mobile track processing machine of the type described in the introduction, with which very high bending forces can be easily transferred to the laid rail with a structurally simple design.
  • lifting tongs are provided as lifting tools, which are arranged between the abutments and symmetrically to the vertical rail plane, and are pivotally mounted on the support frame about an axis running in the longitudinal direction of the machine, each for attacking under the rail head designed lifting tongs is connected to its own pivoting drive, and that both lifting tongs or the pair of lifting tongs are pivotally mounted laterally on an intermediate support which is movably arranged in a recess of the support frame transversely to the machine longitudinal direction.
  • both lifting tongs With the rail head clamped on both sides by means of the central pair of lifting tongs pivotally pivoted to the side of the support frame, very high pressing forces directed onto the rails by both pressure stamps can also be advantageously introduced into the rail as bending forces on both sides, so that, above all, a larger cross section having rails are bendable with great accuracy.
  • the simple and stable, laterally pivotable mounting of both lifting tongs means that the highest and impact-like bending forces can also be transferred to the rail, which is advantageous for the lifting tools and the rail fasteners, and symmetrical load distribution, which can be easily and quickly grasped by the lifting tongs under the rail head .
  • This particularly stable and robust impact-resistant bearing of the lifting tongs as well as the intimate connection - reinforced by the pressing forces of the swiveling cylinders assigned to each lifting tongs - is therefore particularly suitable for increasing the bending accuracy, but particularly the lifting elements due to repeated extreme shock loads suitable for gradual bending.
  • This simple construction with the lifting tongs engaging under the rail head also increases performance. Due to the pendulum-like mounting of the two lifting tongs on an intermediate beam that is essentially freely movable in the transverse direction, a centering for an automatic load balancing for uniform loading of the lifting tongs and for an exact bending in the vertical rail plane can be achieved in a particularly advantageous manner with each lifting operation.
  • - particularly in track arches - slight transverse displacements of the longitudinal center of the bending device and rail or e.g. the rail twists to no disadvantageous one-sided overload.
  • a further advantageous embodiment according to the invention is that the intermediate support, which is preferably symmetrical in the plane of the machine longitudinal and pair of lifting tongs, is concavely curved in the region of its lower support adjoining the support frame and a support part suitable for wear between the support of the intermediate support and the support frame is arranged.
  • This advantageous mounting of the intermediate girder enables this oscillating suspension of the two lifting tongs with minimal design effort, which also withstands particularly high loads with constant automatic load balancing.
  • the support frame can be protected against wear and tear as well as a reduction in strength due to the arrangement of a support part that is easily exchangeable after it has been worn.
  • a particularly advantageous embodiment according to the invention is characterized in that the articulation point of the preferably hydraulic pivoting drive on the lifting tongs is arranged at a distance from the articulation point of the intermediate support and lifting tongs directly adjacent to the support frame in the transverse direction of the machine. Due to the articulation point of the lifting tongs which is directly adjacent to the supporting frame, the bending load on the intermediate carrier, which is particularly disadvantageous for the bending accuracy, can be kept low even with the highest bending forces. With the lateral spacing of the articulation point of the lifting tongs and swivel drive, an advantageous lever effect is formed, which leads to an increase in the forceps closing force for a higher security of the fixation of the rail head.
  • the invention further relates to a particularly advantageous method for bending the rail ends in the area of joints with a track processing machine according to the invention, the rail ends being raised to a permanent deformation against the resistance of abutments pressing on the rail.
  • This method consists in using the two outer pressure plungers placed on the rails as a measuring base by means of two displacement transducers located in the area of the joint, resting on the rail ends and connected to electrical displacement sensors, and determining the deviation from the measuring base and feeding them to a control device and then the ends of the bumps are grasped by the lifting tongs located between the pressure rams below the rail head and gradually raised to a preselected overbending tolerance value by loading the two pressure rams while continuously measuring the displacement or bending value, whereby between the individual bends - while maintaining the Clamping the rail head between the lifting tongs - the pressure ram is relieved and the bending values automatically with increasing proximity to the overbending tolerance value - depending on the measured values taken in the unloaded state - can be reduced
  • This method according to the invention on the basis of a rail joint bending by repeated application of forces with constant measurement of the bending path can be carried out even more quickly and precisely, in particular in connection with the design of the lifting element according to the invention, since the exposed rail head can be detected quickly and safely without additional preparatory work and also by the double-sided clamping is guided by means of the lifting tongs during the entire bend. This is particularly important during the pressure relief after the individual stages, since even in this state, due to the permanent clamping, no e.g. lateral deviation of the rail joint due to internal stresses is possible.
  • the track tamping and straightening machine 1 shown in FIG. 1 has an elongated machine frame 2 which is supported at the end in the area of driving cabs on rail bogies 3 which are formed on a rail 4 and cross sleepers 5 ten tracks are movable.
  • a drive and energy supply device 6 is arranged on the machine frame 2 and a travel drive 8 is provided for advancing the machine 1 in the working direction shown by an arrow 7.
  • a tamping unit 9 with adjustable and vibratable tamping tools is mounted on the machine frame so that it can be adjusted in height and displaced transversely.
  • the tamping unit 9 is preceded by a device 10 for bending the rail ends of a laid track in the region of a rail joint 11, which is height-adjustable by a cylinder-piston drive 12 and can be controlled by a control device 13.
  • the entire bending device 10 can be transversely displaced from one to the opposite rail track by means of spars 14 running transversely to the machine longitudinal direction and connected to the machine frame 2.
  • spars 14 running transversely to the machine longitudinal direction and connected to the machine frame 2.
  • a working cabin is attached to the machine frame 2, through which a precise observation of the bending processes is possible.
  • the bending device 10 shown enlarged and detailed in FIGS. 2 to 4 consists of an elongated support frame 16 which can be supported on the rail 4 by means of two double flange rollers 15 and which is connected to the machine frame 2 in a height-adjustable and transverse manner by means of an extension arm 17.
  • an abutment in the form of a hydraulic pressure cylinder 18 is connected to the support frame 16 with a pressure ram 19 which can be placed on the rail running surface.
  • two lifting tongs 21 are provided as lifting tools, which are arranged symmetrically to the vertical rail plane and are pivotable about an axis or articulation point 20 extending in the machine longitudinal direction.
  • Each lifting clamp 21 designed to engage under the rail head is connected to a pivoting drive 22, which is supported in each case on two lateral extension arms 23 connected to the support frame 16.
  • both lifting tongs 21 are mounted laterally pivotable on an intermediate carrier 24 which is arranged in a corresponding recess 25 of the support frame 16 so as to be movable essentially transversely to the machine longitudinal direction.
  • the intermediate support 24 which is symmetrical to the vertical rail plane or the pair of lifting tongs, is concavely curved, a support part 27 suitable for wear being arranged between the support 26 and the support frame 16.
  • the pressure stamp 19 is shown in dashed lines in FIG. 3 behind the lifting tongs 21.
  • the articulation point 28 of the pivoting drive 22 on the lifting tongs 21 is in each case arranged at a distance from the articulation point 20 of the intermediate support 24 and lifting tongs 21 which is directly adjacent to the support frame 16, so that the pressing force of the pivoting drive 22 is increased by lever action on the lifting tongs 21 and from it the rail 4 is exercised.
  • a pair of lifting rollers 29, which can be adjusted like a pair of pliers is articulated on the supporting frame 16 with a rotating lifting plate designed to bear below the rail head (for simplification in FIG. 4 only shown with dash-dotted lines).
  • the bending device 10 can be used together with the height adjustment drive 12 and a straightening drive 30 articulated on the support frame 16 (FIG. 4) as a conventional track lifting and straightening unit for leveling and straightening the track.
  • a measuring device 31 (FIGS. 2 and 4) measuring the deformation or bending path is provided, which consists of four height-adjustable pushbuttons 32 guided on the supporting frame 16 and a measuring beam 33 and on both sides of the lifting tongs 21, height-adjustable displacement displacement 34 is.
  • Each of these displacement sensors 34 which has a sensing shoe 35 at the lower end, is connected to an electrical displacement sensor 36 in the region of the upper end adjacent to the measuring bar 33.
  • the two buttons 32 located in the area of the pressure stamp 19 are articulatedly connected to the measuring bar 33 and rest with their lower end on a base plate 37 connected to the pressure stamp 19.
  • the pair of lifting tongs 21 is centered exactly above the rail joint 11 by moving the machine 1 and the bending device 10 is lowered onto the rail 4 when the lifting tongs 21 are spread apart. This is recorded by pressing the lifting roller pairs 29 below the rail head and brought into the desired position of the track determined by the track straightening and leveling reference system of the machine 1 by means of the drive 12 and optionally also the straightening drive 30. Subsequently, both lifting tongs 21 are pressed against the rail 4 by actuating their associated pivot drives 22 below the rail head, with limit switches 38 (FIG.
  • the two pressure rams 19 are next automatically acted upon by the control device 13 and placed on the rail 4.
  • the buttons 32 resting on the base plates 37 are also lowered and form a zero base for the measurement of the required bending path. Deviating from this zero basis, the two feeler shoes 35 of the central displacement transducers 34 are placed on the rail ends in accordance with the lowering of the rail joint 11.
  • the electrical Displacement sensor 36 detects the deviation from the measuring bar 33 representing the zero base and supplies the corresponding measurement signal as a control variable for the following iterative (step-by-step) bending process to the control device 13 which is designed with integrated control electronics.
  • the first bend is initiated by acting on the pressure plunger 19, which forms a 3-point bending system with the lifting tongs 21, in order to generate pressing forces represented by force arrows 39 (FIG. 2) on the rail 4.
  • the lowering of the pressure rams 19 results in the lifting of the supporting frame 16 together with the lifting tongs 21 fastened thereon, so that an upward bending force shown by a force arrow 40 is exerted with them.
  • the pressure rams 19 are relieved and the path of the bend is determined with the aid of the displacement transducers 34. This bending path as a result of the previous bending step forms the bending dimension for the next following bending process, which is automatically determined by the control device 13.
  • the activity of the machine operator is limited to triggering the bending process by pressing the control device 13 and monitoring the entire bending process. This is complete as soon as a preset tolerance value is reached.
  • the rail joint 11 raised to the target value is consequently still supported by the tamping unit 9 of the machine 1 in order to avoid further deformation loads.
  • the step-by-step bending process is shown graphically on a diagram, 46 corresponding to the force and 47 corresponding to the deformation or bending path.
  • the size 48 shows the entire bending path, which has a tolerance value 51, the difference between 48 and 49 corresponding to the bending path reached in the first bending step.
  • the difference between 49 and 50 or 50 and 51 corresponds to the second or third bending step.
  • the elastic bending behavior means that the rail joint has to be displaced above the actual bending value in each bending step in order to finally obtain a plastic deformation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Soil Working Implements (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Agricultural Machines (AREA)
EP85890146A 1985-06-28 1985-06-28 Fahrbare Gleisbearbeitungsmaschine und Verfahren zum Biegen der Schienenenden verlegter Gleise im Bereich der Stossstellen Expired EP0205723B1 (de)

Priority Applications (11)

Application Number Priority Date Filing Date Title
EP85890146A EP0205723B1 (de) 1985-06-28 1985-06-28 Fahrbare Gleisbearbeitungsmaschine und Verfahren zum Biegen der Schienenenden verlegter Gleise im Bereich der Stossstellen
AT85890146T ATE37212T1 (de) 1985-06-28 1985-06-28 Fahrbare gleisbearbeitungsmaschine und verfahren zum biegen der schienenenden verlegter gleise im bereich der stossstellen.
DE8585890146T DE3564975D1 (en) 1985-06-28 1985-06-28 Mobile track-working machine and method for bending the ends of laid rails in the joint zone
HU861572A HU195548B (en) 1985-06-28 1986-04-15 Movable track working machine and method for bending the rail ends of laid tracks at the area of jointing places
US06/858,108 US4744302A (en) 1985-06-28 1986-05-01 Mechanism for bending abutting rail section ends at rail joints in the operation of a track working machine
SU864027450A RU1788994C (ru) 1985-06-28 1986-05-12 Способ пластической гибки уложенных в пути рельсов в области сваренного стыка и установка дл его осуществлени
CA000508973A CA1258223A (en) 1985-06-28 1986-05-13 Mechanism and method for bending abutting rail section ends at rail joints in the operation of a track working machine
AU58251/86A AU577469B2 (en) 1985-06-28 1986-06-02 Track tamping and lining machine
DD86291410A DD247476A5 (de) 1985-06-28 1986-06-18 Fahrbare gleisbearbeitungsmaschine und verfahren zum biegen der schienenenden verlegter gleise im bereich der stossstellen
CS864782A CS266335B2 (en) 1985-06-28 1986-06-27 Mobile machine for track working
JP61151321A JPS6210304A (ja) 1985-06-28 1986-06-27 自走式軌道保守機械

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85890146A EP0205723B1 (de) 1985-06-28 1985-06-28 Fahrbare Gleisbearbeitungsmaschine und Verfahren zum Biegen der Schienenenden verlegter Gleise im Bereich der Stossstellen

Publications (2)

Publication Number Publication Date
EP0205723A1 EP0205723A1 (de) 1986-12-30
EP0205723B1 true EP0205723B1 (de) 1988-09-14

Family

ID=8194751

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85890146A Expired EP0205723B1 (de) 1985-06-28 1985-06-28 Fahrbare Gleisbearbeitungsmaschine und Verfahren zum Biegen der Schienenenden verlegter Gleise im Bereich der Stossstellen

Country Status (11)

Country Link
US (1) US4744302A (cs)
EP (1) EP0205723B1 (cs)
JP (1) JPS6210304A (cs)
AT (1) ATE37212T1 (cs)
AU (1) AU577469B2 (cs)
CA (1) CA1258223A (cs)
CS (1) CS266335B2 (cs)
DD (1) DD247476A5 (cs)
DE (1) DE3564975D1 (cs)
HU (1) HU195548B (cs)
RU (1) RU1788994C (cs)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2201445B (en) * 1987-02-27 1991-01-02 Plasser Bahnbaumasch Franz A travelling track maintenance machine, more especially a tamping, lifting and lining machine for switches and crossings
JPH0257692A (ja) * 1988-08-22 1990-02-27 Nissan Motor Co Ltd 自動車用アルミニウム合金部材
JP2528698B2 (ja) * 1988-10-24 1996-08-28 株式会社神戸製鋼所 脱脂性に優れた塗油アルミニウム合金板の製造方法
KR930007104A (ko) * 1991-09-30 1993-04-22 김광호 전압레벨쉬프트 디지탈/아날로그 변환회로
DE10152380A1 (de) * 2001-10-28 2003-06-26 Pieper Siegfried Vorrichtung zur Erfassung von Kräften und Veränderungen an Rädern von Schienenfahrzeugen
US6662729B1 (en) * 2002-07-30 2003-12-16 Harsco Technologies Corporation Rail anchor spreader
FR2867787B1 (fr) * 2004-03-17 2015-12-25 Tso Procede et dispositif pour redresser les rails d'une voie ferree
CN101187190B (zh) * 2007-11-14 2011-05-25 安阳振动器有限责任公司 安装在一根钢轨上工作的捣固机
RU2440908C1 (ru) * 2010-08-20 2012-01-27 Валерий Николаевич Сиротин Механизм торможения
AT513367B1 (de) * 2012-09-13 2014-11-15 Vossloh Mfl Rail Milling Gmbh Verfahren und Vorrichtung zur kraftabhängigen Steuerung bei der Schienenbearbeitung
EP2971356B1 (en) * 2013-03-15 2018-07-04 Harsco Corporation Rail vehicle
RU2570972C2 (ru) * 2013-12-03 2015-12-20 Акционерное общество "ГОЗ Обуховский завод" Тормозное устройство
CA2976275C (en) 2015-02-11 2022-04-12 Portal Crane Parts Ltd. Retracting rail clamp
CN108001975B (zh) * 2017-11-30 2019-05-31 华东交通大学 一种单轨运输机导轨摆正装置
CN110872798B (zh) * 2018-08-31 2025-02-18 中国铁建高新装备股份有限公司 一种用于清筛机水平导槽安装的机械装置
CN113047098A (zh) * 2019-12-27 2021-06-29 成都真火科技有限公司 一种基于层流等离子的在线钢轨表面强化设备的作业方法
US11919108B2 (en) * 2021-05-08 2024-03-05 One Rail Group, Llc Automated geometry and crowning apparatus for use of mobile electric flash-butt welding of railroad rails and rail inserts

Citations (1)

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Publication number Priority date Publication date Assignee Title
EP0127935A1 (en) * 1983-04-23 1984-12-12 The Permanent Way Equipment Company Limited Method of and apparatus for bending and straightening

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AT238245B (de) * 1960-02-16 1965-01-25 Plasser Bahnbaumasch Franz Fahrbare Maschine zum Ausrichten von Gleisen
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SU662479A1 (ru) * 1976-01-15 1979-05-15 Предприятие П/Я Р-6760 Рельсовый захват
AT348569B (de) * 1976-12-23 1979-02-26 Plasser Bahnbaumasch Franz Fahrbare gleisbearbeitungsmaschine
AT369068B (de) * 1978-11-30 1982-12-10 Plasser Bahnbaumasch Franz Fahrbare gleisbearbeitungsmaschine fuer weichen, kreuzungen und streckengleise
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Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0127935A1 (en) * 1983-04-23 1984-12-12 The Permanent Way Equipment Company Limited Method of and apparatus for bending and straightening

Also Published As

Publication number Publication date
JPS6210304A (ja) 1987-01-19
AU5825186A (en) 1987-01-08
DD247476A5 (de) 1987-07-08
RU1788994C (ru) 1993-01-15
EP0205723A1 (de) 1986-12-30
HU195548B (en) 1988-05-30
DE3564975D1 (en) 1988-10-20
ATE37212T1 (de) 1988-09-15
CA1258223A (en) 1989-08-08
US4744302A (en) 1988-05-17
CS266335B2 (en) 1989-12-13
HUT43658A (en) 1987-11-30
CS478286A2 (en) 1989-02-10
AU577469B2 (en) 1988-09-22

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