EP0200037B1 - Dispositif pour le support d'un pic de coupe et pour la commande de l'alimentation en agent de pulvérisation de machines de creusement - Google Patents

Dispositif pour le support d'un pic de coupe et pour la commande de l'alimentation en agent de pulvérisation de machines de creusement Download PDF

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Publication number
EP0200037B1
EP0200037B1 EP19860104768 EP86104768A EP0200037B1 EP 0200037 B1 EP0200037 B1 EP 0200037B1 EP 19860104768 EP19860104768 EP 19860104768 EP 86104768 A EP86104768 A EP 86104768A EP 0200037 B1 EP0200037 B1 EP 0200037B1
Authority
EP
European Patent Office
Prior art keywords
base part
tool holder
recess
receiving part
cutting
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
EP19860104768
Other languages
German (de)
English (en)
Other versions
EP0200037A2 (fr
EP0200037A3 (en
Inventor
Ingo Barnstdorf
Ulrich Dargatz
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.)
Kennametal GmbH
Original Assignee
Kennametal 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 Kennametal GmbH filed Critical Kennametal GmbH
Publication of EP0200037A2 publication Critical patent/EP0200037A2/fr
Publication of EP0200037A3 publication Critical patent/EP0200037A3/de
Application granted granted Critical
Publication of EP0200037B1 publication Critical patent/EP0200037B1/fr
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/187—Mining picks; Holders therefor with arrangement of fluid-spraying nozzles
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor

Definitions

  • the invention relates to a device for holding a cutting bit and for controlling the supply of spraying agent in a tunneling machine, with a base part fixedly attached to the tool carrier, which contains at least one nozzle, a pressure valve for controlling the supply of spraying agent and spraying center channels, and with a pivotally mounted on the base part , against the cutting pressure resiliently supported chisel holder, in which the cutting chisel is interchangeably arranged, the chisel holder having a socket-like receiving part with a continuous axial opening for receiving the chisel shaft and a radially projecting part from the receiving part, at the free end with the base part for pivotable mounting of the chisel holder has a connected extension arm and the pressure valve is arranged in the base part in such a way that it is actuated by a cutting reaction-dependent pivoting movement of the chisel holder to release the spraying means.
  • the chisel holder is provided with a recess parallel to the chisel axis and open towards the base part, into which the base part penetrates, the pivot axis passing through the side walls of the recess which extend over the base part, which also serve to guide the bit holder, and wherein the bit holder is supported between these side parts on the spring-loaded pressure valve directed perpendicular to the bit axis.
  • the invention has for its object to provide a device of the type specified in such a way that trouble-free operation is ensured with the main relief of the pivot bearing.
  • the base part has a recess into which the socket-like receiving part protrudes and which is dimensioned such that it allows the pivoting movement of the bit holder, and that on the base part and on the socket-like receiving part stop surfaces which are in the working position of the chisel holder lie flat against one another, and stop surfaces which lie flat against one another in the rest position of the chisel holder are provided.
  • the socket-like receiving part of the bit holder and thus also the cutting bit sitting in the axial opening of the receiving part is received coaxially by the recess of the base part, so that all forces acting on the bit are transmitted directly to the base part via the socket-like receiving part will.
  • the recess in the base part also supports the socket-like receiving part against lateral forces. The interaction of the stop surfaces on the socket-like receiving part and on the recess in the base part results in defined positions of the bit holder both in the rest position and in the working position.
  • the device for holding a cutting bit 10 shown in FIGS. 1 to 3 essentially consists of a base part 11 and a bit holder 12 pivotably mounted on the base part.
  • the base part 11 is a solid steel block, the base 13 of which is attached to a tool carrier 14, for example the cutting head a tunneling machine is welded, and its end face 15 pointing in the direction of advance forms an angle of, for example, 45 ° with the base area 13.
  • the rear side 16 of the base part 11 adjoins the base surface 13 with a curvature and then rises at a steeper angle than the end surface 15, so that the base part 11 tapers upwards in the side view.
  • a continuous recess 20 is formed in the tapered section of the base part 11 and is directed essentially perpendicular to the end face 15 of the base part.
  • the recess 20 has a rectangular cross section with rounded corners, so that the recess 20 has two lateral boundary surfaces 21, 22, an outer boundary surface 23 and an inner boundary surface 24.
  • a stepped blind bore 25 is provided with an axis directed perpendicular to the end face 15.
  • a pressure valve 26 of a type known per se is arranged in the blind bore 25.
  • the pressure valve 26 has an axial actuating plunger 27 which protrudes slightly beyond the end face 15 of the base part 11.
  • Another blind bore 28 with an axis directed perpendicular to the end face 15 is made in the tapered end section of the base part 11 on the other side of the recess 20.
  • the blind bore 28 serves to receive a nozzle 29 of a type known per se, which is intended to be a spraying agent, usually water or a water / compressed air mixture, to avoid sparking, to deposit the dust and, if appropriate, also to cool the cutting bit 10 spray out.
  • a channel 30 formed in the base part 11 connects the pressure valve 26 bypassing the recess 20 with the nozzle 29, so that the pressure valve 26 controls the supply of the spraying agent to the nozzle 29.
  • the channel 30 can be formed in a conventional manner by making holes from different locations on the outer surface of the base part 11, the mouths of which are then closed by plugs 31.
  • the chisel holder 12 consists essentially of a socket-like receiving part 32 for receiving the cutting chisel 10 and a cantilever arm 33 which projects essentially radially from the receiving part 32 and with which the chisel holder 12 is mounted on the base part 11 in such a way that it can be pivoted by a limited angle .
  • the receiving part 32 has a continuous axial opening 34 which is adapted to the bit shank of the cutting bit 10 used.
  • the cutting chisel 10 is a round shank chisel, the chisel shank 35 of which has a constant circular cross section.
  • the axial opening 34 is also a bore of a constant circular cross section.
  • the chisel shaft 35 is longer than the receiving part 32, so that its end protrudes rearward from the axial opening 34.
  • an annular groove 36 is provided, into which a spring ring 37 is inserted, which secures the round shank chisel in the receiving part 32.
  • the receiving part 32 can be designed to receive any other standard cutting chisel, for which it is only necessary to adapt the axial opening 34 to the chisel shaft and its fastening means in the same way as in a conventional fixed chisel holder.
  • the cantilever arm 33 is formed as a rigid, solid part in one piece with the receiving part 32, and the pivotable mounting on the base part 11 takes place by means of a hinge 40.
  • the cantilever arm 33 is at the free end an eye 41 is formed, and two projections 42, 43 (FIG. 3) serving as bearing blocks are formed on the end face of the base part 11, between which there is a recess 44 in which the end section of the cantilever arm 33 lies with the eye 41.
  • a hinge 40 completes through coaxial bores in the projections 42, 43 and in the eye 41, thus completing the hinge 40.
  • the entire chisel holder 12 with the cutting chisel 10 received by it can be pivoted about the axis of the hinge pin 45 relative to the base part 11.
  • the socket-like receiving part 32 protrudes into the recess 20 of the base part 11 and, in this area, as can be seen from the sectional view of FIG. 2, has an outer cross-sectional profile which is adapted to the cross-sectional profile of the recess 20 in such a way that the required pivoting movement of the bit holder 12 is permitted and at the same time good lateral guidance is achieved with this pivoting movement.
  • the outer cross-sectional profile of the section of the receiving part 32 lying in the recess 20 is therefore rectangular, preferably square, with cut corners, so that the receiving part 32 has two parallel side surfaces 46, 47, an outer surface in this region 48 and has an inner surface 49.
  • the distance between the side surfaces 46 and 47 corresponds with a slight undersize to the distance between the parallel lateral boundary surfaces 21 and 22 of the recess 20, so that the receiving part 32 can slide with little play between the lateral boundary surfaces 21 and 22 and thereby laterally over its entire height to be led.
  • the distance between the outer surface 48 and the inner surface 49 is smaller than the distance between the boundary surfaces 23 and 24 of the recess 20, so that there is an intermediate space 50 which enables the pivotal movement of the bit holder 12.
  • the section of the bush-like receiving part 32 lying outside the recess 20 widens into an annular collar 51 which merges into the extension arm 33.
  • the annular collar 51 is so wide that it essentially covers the entire part of the end face 15 of the base part 11 surrounding the recess 20.
  • a cutout 52 is provided which allows the spraying agent to emerge freely.
  • the front side of the collar 51 facing away from the base part 11 is designed as a contact surface for the shoulder existing between the chisel shank and the chisel head of the cutting chisel 10 used.
  • the protruding annular surface 53 of the collar 51 facing the base part 11 forms a stop surface which, when the bit holder 12 is pivoted, bears against the end face 15 of the base part 11 and thereby limits the pivoting movement of the bit holder 12 towards the base part 11.
  • At least one blind hole 54 is made on the side facing the base part 11, into which a helical compression spring 55 is inserted, which is supported on the end face 15 of the base part 11.
  • the helical compression spring 55 tries to pivot the chisel holder 12 away from the base part 11, that is to say clockwise in the view from FIG. 1.
  • the Pivotal movement in this direction is limited by the fact that the outer surface 48 of the receiving part 32 comes to rest on the outer boundary surface 23 of the recess 20. This corresponds to the rest position shown in FIG. 1 with the cutting bit 10 unloaded.
  • the actuating tappet 27 of the pressure valve 26 lies between the receiving part 32 and the hinge 40 on the surface of the extension arm 33 facing the base part 11.
  • the pressure valve 26 is set so that it is closed in the rest position of the bit holder 12, but is opened when the bit holder 12 is pivoted toward the base part 11.
  • the bit holder 12 In the rest position when the cutting bit 10 is not loaded, the bit holder 12 is pressed by the helical compression spring 55 into the rest position shown in FIG. 1, in which the pressure valve 26 is closed, so that no spraying agent reaches the nozzle 29.
  • the bit holder 12 pivots against the force of the helical compression spring 55 by an angle of approximately 3-5 ° until the ring surface 53 abuts the end face 15 of the base part 11.
  • the cutting bit 10 moves about 5 mm on an arc.
  • the dimensions of the receiving part 32 are preferably such that in this working position the inner surface 49 also comes into abutment with the inner boundary surface 24 of the recess 20. To make this possible, the boundary surfaces 23 and 24 are not parallel to one another, but rather form an angle with one another which corresponds to the pivoting angle.
  • the front, interchangeable bit holder 12 provides extensive wear protection for the base part 11, which cannot be exchanged underground.
  • the chisel holder 12 practically covers the entire end face of the base part 11 with the exception of the two bearing projections 42 and 43.
  • the cutting pressure of the cutting bit 10 required to actuate the pressure valve 26 is significantly lower than in devices in which the pressure valve is actuated directly by the axial displacement of the cutting bit.
  • the interchangeability of the chisel holder 12 also enables easy access to the pressure valve 26 so that it can be exchanged without problems. By exchanging the chisel holder 12, it is also possible to use the same base part for receiving different commercially available cutting chisels.
  • the width, height and length of the chisel holder are not larger and possibly even smaller than with conventional chisel holders.
  • a wear-resistant material of great hardness is preferably used for the bit holder 12, so that the service life of the bit holder is increased.
  • the base part 11 can be made of a material that is also wear-resistant, but above all that can also be welded well, so that the base part can be welded onto the tool carrier 14 easily and safely.
  • FIGS. 4 and 5 Another embodiment of the chisel holding device is shown in FIGS. 4 and 5.
  • the corresponding parts in FIGS. 4 and 5 are denoted by the same, but increased by 100 reference numerals as in FIGS. 1 to 3. A detailed description of these corresponding parts and their mode of operation is therefore unnecessary.
  • the device for holding the cutting bit 110 which has the same shape as in FIGS. 1 to 3, in turn consists of a base part 111 with a base 113, an end face 115 and a rear side 116 and a bit holder 112 pivotably mounted on the base part.
  • the recess 120, the blind bore 125 for receiving the pressure valve 126 and the blind bore 128 for receiving the nozzle 129 are formed.
  • the recess 120 has the same cross-sectional shape as in the embodiment of FIGS. 1 to 3.
  • the socket-like receiving part 132 of the bit holder 112 intended for receiving the cutting bit 110 also has essentially the same shape and function as in the embodiment 1 to 3.
  • the continuous axial opening 134 receives the chisel shaft 135, which is secured therein by the spring ring 137 inserted into the annular groove 136.
  • the outer cross-sectional profile of the section of the receiving part 132 protruding into the recess 120 is adapted in the manner described above to the cross-sectional profile of the recess 120, so that in particular the previously described lateral guidance of the receiving part 132 in the recess 120 is achieved.
  • the main difference compared to the embodiment of FIGS. 1 to 3 consists in the design of the cantilever arm 133 and in the pivotable mounting of the chisel holder 112.
  • the cantilever arm 133 is no longer formed rigidly and in one piece with the receiving part 132, but rather a spring steel plate which is separate from the receiving part 132 160.
  • One end of the spring steel plate 160 which has a cutout receiving the head of the cutting bit 110, is clamped with screws 161 between the collar 151 of the receiving part 132 and a cover plate 162 covering the spring steel plate 160 around the head of the cutting bit 110.
  • the other end of the spring steel plate 160 is clamped by means of screws 163 on a projection 164 formed on the base part 111.
  • a cavity 165 in which the central part of the spring steel plate 160 is exposed. Also protrudes into this cavity 165 is an extension 166 formed on the collar 151, against which the actuating plunger 127 of the pressure valve 126 bears.
  • a protective box 167 which is screwed together with the spring steel plate 160 to the projection 164 by means of the screws 163, surrounds the projection 164 and the cavity 165 on the front side and on both sides, so that the cavity 165 is enclosed on all sides. There is only a narrow slot 168 between the mutually facing surfaces of the receiving part 132 and the protective box 167.
  • the spring steel plate 160 forms the joint that enables the pivotal movement of the bit holder 112 relative to the base part 111.
  • the spring steel plate 160 is installed so that it tries to hold the bit holder 112 resiliently in the rest position of FIG. 4 due to its elasticity.
  • the section of the spring steel plate 160 exposed in the cavity 165 can bend, as a result of which the bit holder 112 pivots about an imaginary axis of rotation into the working position of FIG. 5.
  • the lug 166 acts on the actuating plunger 127 of the pressure valve 126, so that the pressure valve is opened and the access of the spraying means to the nozzle 129 is released.
  • the pivoting of the bit holder is made possible by the slot 168, which has a curvature along the side walls of the protective box 167, the center of curvature of which lies on the imaginary axis of rotation.
  • the slot 168 can thereby be kept very narrow, which largely prevents dirt from penetrating into the cavity 165.
  • FIGS. 4 and 5 gives all the advantages which were previously described for the embodiment of FIGS. 1 to 3.
  • the recess in the base part and the section of the receiving part projecting into the recess can also have other cross-sectional shapes which permit the required pivoting movement and result in good lateral guidance.
  • a suitable cross-sectional shape is, for example, circular with parallel flats on both sides.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)

Claims (8)

1. Dispositif pour le support d'un pic de coupe (10 ; 110) ainsi que pour la commande de l'alimentation en agent de pulvérisation sur une machine de percement, comportant une partie de base (11 ; 111), fixée sur un porte-outil (14), qui contient au moins une buse (29 ; 129), un détendeur (26; 126) pour la commande de l'alimentation en agent de pulvérisation et des canaux (30) d'agent de pulvérisation, et comportant un support de pic (12 ; 112), supporté élastiquement à l'égard de la pression de coupe, monté pivotant sur la partie de base (11 ; 111), et sur lequel le pic de coupe (10 ; 110) est interchangeable, le support de pic (12 ; 112) comportant une partie réceptrice (32 ; 132) en forme de manchon, à ouverture axiale traversante (34; 134) pour la réception du fût de pic (35 ; 135) et un bras cantilever (33 ; 133) se détachant à peu près radialement de la partie réceptrice (32 ; 132), dont l'extrémité libre est reliée à la partie de base (11 ; 111) pour assurer le montage pivotant du support de pic (12 ; 112), le détendeur (26 ; 126) étant disposé sur la partie de base (11 ; 111) de manière à être actionné, pour libérer l'agent de pulvérisation par un mouvement de pivotement du support de pic (12 ; 112) dû à une réaction de coupe, caractérisé err ce que la partie de base (11 ; 111) présente un évidement (20 ; 120) dans lequel fait saillie la partie réceptrice en forme de manchon (32; 132) et qui est dimensionné de manière à permettre le mouvement de pivotement du support de pic (12 ; 112) et que, sur la partie de base (11 ; 111) et sur la partie réceptrice en forme de manchon (32 ; 132), sont prévues des surfaces de butée (15, 24, 49, 53 ; 115, 124, 149, 153) qui, en position de travail du support de pic (12 ; 112) s'appliquent à plat l'une contre l'autre, et des surfaces de butée (23, 48 ; 123, 148) qui, en position de repos du support de pic (12 ; 112), s'appliquent à plat l'une contre l'autre.
2. Dispositif selon la revendication 1, caractérisé par le fait que l'évidement (20 ; 120) de la partie de base (11 ; 111) et la section de la partie réceptrice en forme de manchon (32 ; 132) qui fait saillie dans l'évidement (20; 120) sont formés avec des faces de guidage (21, 22, 46, 47) parallèles, perpendiculaires à l'axe de pivotement du support de pic (12 ; 112) et coopérant au guidage latéral.
3. Dispositif selon l'une des revendications 1 ou 2, caractérisé par le fait que le détendeur (26 ; 126) est monté dans la partie de base (11 ; 111) entre l'évidement (20 ; 120) et la zone d'ancrage du bras cantilever (33 ; 133) de manière à être actionné par le support de pic (12 ; 112) lors de son mouvement de pivotement.
4. Dispositif selon la revendication 3, caractérisé par le fait que la buse (29 ; 129) est monté dans la partie de base (11 ; 111) sur le côté de l'évidement (20 ; 120) opposé au détendeur (26 ; 126).
5. Dispositif selon l'une des revendications 1 à 4, caractérisé par le fait que le bras cantilever (33) est rigide et monté pivotant sur la partie de base (11) au moyen d'une charnière (40), et, entre la partie de base (11) et le support de pic (12), est disposé au moins un ressort (55) rappelant le support de pic (12) en position de repos.
6. Dispositif selon l'une des revendications 1 à 4, caractérisé par le fait que le bras cantilever (133) est fixé par son extrémité libre à la partie de base (111) et, pour réaliser une articulation à ressort, présente une structure ayant au moins partiellement une élasticité de ressort.
7. Dispositif selon la revendication 6, caractérisé par le fait que le bras cantilever (133) est constitué par une plaque d'acier à ressort (160) reliée à la partie réceptrice (132).
8. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que le support de pic (12 ; 112) est disposé devant la face frontale (15; 115) de la partie de base (11 ; 111) et recouvre à peu près toute la face frontale (15 ; 115) de la partie de base (11 ; 111).
EP19860104768 1985-05-02 1986-04-08 Dispositif pour le support d'un pic de coupe et pour la commande de l'alimentation en agent de pulvérisation de machines de creusement Expired EP0200037B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19858512938 DE8512938U1 (de) 1985-05-02 1985-05-02 Vorrichtung für die Halterung eines Schneidmeißels sowie für die Steuerung der Bedüsungsmittelzufuhr bei einer Vortriebsmaschine
DE8512938U 1985-05-02

Publications (3)

Publication Number Publication Date
EP0200037A2 EP0200037A2 (fr) 1986-11-05
EP0200037A3 EP0200037A3 (en) 1987-02-04
EP0200037B1 true EP0200037B1 (fr) 1989-03-15

Family

ID=6780588

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860104768 Expired EP0200037B1 (fr) 1985-05-02 1986-04-08 Dispositif pour le support d'un pic de coupe et pour la commande de l'alimentation en agent de pulvérisation de machines de creusement

Country Status (3)

Country Link
EP (1) EP0200037B1 (fr)
DE (2) DE8512938U1 (fr)
ES (1) ES8705080A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3902222C1 (en) * 1989-01-26 1990-06-07 Fa. Michael Komotzki, 4600 Dortmund, De Cutter-pick arrangement
WO1999000580A1 (fr) 1997-06-25 1999-01-07 Tamrock Voest-Alpine Bergtechnik Gesellschaft Mbh Dispositif pour outil tranchant d'un porte-outil monte rotatif

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3611348A1 (de) * 1986-04-04 1987-10-08 Saarbergwerke Ag Meisselhalter zur befestigung von insbesondere rundschaftmeisseln auf einem schneidkopf
DE4126203C2 (de) * 1991-08-08 1993-12-16 Krampe & Co Verwendung des Coanda-Effektes bei einer Meißelhalteranordnung mit einem Meißel für Gewinnungsmaschinen
DE102004019383B4 (de) * 2004-04-19 2008-06-12 Wirtgen Gmbh Vorrichtung zur Halterung eines Schaftmeißels
DE102010038016C5 (de) * 2010-10-06 2020-07-23 Wirtgen Gmbh Mischersteg für einen Stabilisierer/Recycler
CN106979009B (zh) * 2016-01-15 2020-02-11 刘素华 采掘机齿架耐磨密封护套冲击装置
WO2018050900A1 (fr) * 2016-09-19 2018-03-22 Minnovation Limited Ensemble pic de havage avec ensemble de pulvérisation d'eau

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU621873A1 (ru) * 1977-04-12 1978-08-30 Центральный Научно-Исследовательский И Проектно-Конструкторский Институт Проходческих Машин И Комплексов Для Угольной,Горной Промышленности И Подземного Строительства" Исполнительный орган проходческого комбайна
SE452638B (sv) * 1982-03-10 1987-12-07 Sandvik Ab Anordning for vetsketillforsel vid roterande verktyg for brytning av fast material
DE3234993A1 (de) * 1982-09-22 1984-03-22 Bergwerksverband Gmbh, 4300 Essen Automatische teilbeduesung an schneidend arbeitenden gewinnungsmaschinen
DE3341321C2 (de) * 1983-11-15 1986-04-24 Ruhrkohle Ag, 4300 Essen Anordnung der Schneidmeißelhalterung am Schneidkörper

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3902222C1 (en) * 1989-01-26 1990-06-07 Fa. Michael Komotzki, 4600 Dortmund, De Cutter-pick arrangement
WO1999000580A1 (fr) 1997-06-25 1999-01-07 Tamrock Voest-Alpine Bergtechnik Gesellschaft Mbh Dispositif pour outil tranchant d'un porte-outil monte rotatif

Also Published As

Publication number Publication date
ES8705080A1 (es) 1987-04-16
EP0200037A2 (fr) 1986-11-05
DE8512938U1 (de) 1985-07-25
EP0200037A3 (en) 1987-02-04
ES554612A0 (es) 1987-04-16
DE3662419D1 (en) 1989-04-20

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