EP0275890A1 - Pic à queue ronde - Google Patents

Pic à queue ronde Download PDF

Info

Publication number
EP0275890A1
EP0275890A1 EP88100268A EP88100268A EP0275890A1 EP 0275890 A1 EP0275890 A1 EP 0275890A1 EP 88100268 A EP88100268 A EP 88100268A EP 88100268 A EP88100268 A EP 88100268A EP 0275890 A1 EP0275890 A1 EP 0275890A1
Authority
EP
European Patent Office
Prior art keywords
chisel
clamping sleeve
bore
holder
shank
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
EP88100268A
Other languages
German (de)
English (en)
Other versions
EP0275890B1 (fr
Inventor
Peter Simon
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.)
Betek GmbH and Co KG
Original Assignee
Betek Bergbau und Hartmetalltechnik Karl Heinz Simon GmbH and Co KG DE
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 Betek Bergbau und Hartmetalltechnik Karl Heinz Simon GmbH and Co KG DE filed Critical Betek Bergbau und Hartmetalltechnik Karl Heinz Simon GmbH and Co KG DE
Publication of EP0275890A1 publication Critical patent/EP0275890A1/fr
Application granted granted Critical
Publication of EP0275890B1 publication Critical patent/EP0275890B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • E21C35/19—Means for fixing picks or holders
    • E21C35/197—Means for fixing picks or holders using sleeves, rings or the like, as main fixing elements

Definitions

  • the invention relates to a round shank chisel with a chisel head and chisel shank, in which the chisel shank has a circumferential groove with a longitudinally slotted clamping sleeve therein and in which the chisel shaft with the tensioned clamping sleeve is axially fixable in a bore of a chisel holder, while the chisel shaft in the clamping sleeve remains freely rotatable.
  • Such a round chisel is known from US-PS 14 75 136.
  • the clamping sleeve extends over the most important part of the axial dimension of the chisel shaft in order to obtain the largest possible support and clamping area for the clamping sleeve in the bore of the chisel holder.
  • Such long clamping sleeves also have the advantage that a sufficiently large holding force is generated between the clamping sleeve and the bore of the bit holder.
  • the clamping sleeve is held by means of a holding member in a clamping position in which the outer diameter of the clamping sleeve is equal to or smaller than the diameter of the bore of the bit holder and that when inserting the bit shaft with the clamping sleeve into the bore of the chisel holder, the holding member is adjustable in an area of the chisel shaft lying outside the clamping sleeve.
  • the clamping sleeve is prestressed to such an extent that the chisel shank with the clamping sleeve can also be pushed manually over a large part of the axial dimension into the bore of the chisel holder until, e.g. the holding member rests on the insertion side of the chisel holder.
  • the round shank chisel can then be driven in with a hammer blow until the chisel head stops on the chisel holder.
  • the holding member is pushed down by the clamping sleeve and reaches an area of the chisel shank that is free of the clamping sleeve, so that the clamping sleeve can clamp with its own clamping force in the bore of the chisel holder, the clamping force increasing correspondingly with increasing driving depth.
  • a particularly simple embodiment is characterized in that the holding member is designed as a retaining ring or retaining disc which surrounds the clamping sleeve and that the inside diameter of the retaining ring or retaining disc is equal to or smaller than the diameter of the bore of the bit holder.
  • Such a holding member is a simple, easy and inexpensive to manufacture part.
  • a further embodiment provides that the circumferential groove of the chisel shaft up to a distance to the chisel head that is equal to or greater than the diameter of the round material used for the retaining ring or the thickness of the holding disc.
  • the chisel head of the round shank chisel can be supported on the facing end of the chisel holder if the configuration is such that the bore of the chisel holder on the insertion side has an extension which, when the chisel shank with an adapter sleeve is inserted into the bore, holds the retaining member designed as a retaining ring.
  • the holding member of the round shank chisel can be used as a protective disk for the end face of the chisel holder in that the holding member designed as a holding washer is arranged on the insertion side of the chisel holder when the chisel shank with clamping sleeve is inserted into the bore of the chisel holder between the bit head and the wall surrounding the bore.
  • the holding disc is made of wear-resistant material and has an outer diameter that is equal to or larger than the maximum outer diameter of the chisel head, then the holding disc serves in the area protruding beyond the chisel head as wear protection for the chisel holder.
  • the chisel head ends in a collar facing the chisel shaft, that a hard metal insert is inserted into the chisel tip facing away from the chisel shaft, and that the clamping sleeve extends essentially over the entire axial length of the chisel shaft.
  • the round shank chisel 10 adjoins the chisel head 11 of the chisel shank 14.
  • the transition of the chisel head is designed as a collar 13, which forms the largest outer diameter of the chisel head 11.
  • the hard metal insert 12 is inserted into the chisel tip in a known manner.
  • On the chisel shaft 14 sits in the circumferential groove 15, the clamping sleeve 17 provided with the longitudinal slot 8.
  • the clamping sleeve 17 extends over the most important part of the axial dimension of the chisel shaft 14, so that the collar 16 at the free end of the chisel shaft 14 and that of the clamping sleeve 17 free area up to the chisel head 11 are very narrow.
  • a holding disc 19 is pushed as a holding member, which clamps the clamping sleeve 17 so far that its outer diameter is equal to or smaller than the diameter of the bore 21 in the bit holder 20.
  • the longitudinal slot 18 is so wide that the clamping sleeve 17 so squeezed wide can be that its inner wall rests on the groove base of the circumferential groove 15 in the chisel shaft 14.
  • the round shank chisel 10 can easily be inserted into the bore 21 of the chisel shank 14. This insertion process can be carried out manually until the holding member 19 strikes the end of the bit holder 20. With increased application of force, for example with a hammer blow, the round shank chisel 10 can be driven into the bore 21 until the collar 13 of the chisel head 11 is supported on the end face of the chisel holder 20 via the holding member 19.
  • the holding member 19 designed as a holding disc is pushed down from the clamping sleeve 17 into the free area of the chisel shaft 14 between the clamping sleeve 17 and the chisel head 11, so that it releases the clamping sleeve 17.
  • the clamping sleeve 17 can now clamp with its own clamping force in the bore 21 of the bit holder 20, since in the relaxed state it would assume an outer diameter that is larger than the diameter of the bore 21 of the bit holder 20. The difference between these two diameter values determines that Clamping force of the clamping sleeve 17 and thus the force with which the round shank chisel 10 is held in the bore 21 of the chisel holder 20.
  • the outer diameter of the holding disk corresponds to the maximum outer diameter of the chisel head 11 in the region of the collar 13.
  • the holding disk serves as a protective disk for the chisel holder 20, since it absorbs the impact forces acting on the picks 10. If the outside diameter of the holding disk is increased beyond the maximum outside diameter of the chisel head 11, the entire end face of the chisel holder 20 can be protected against wear if the holding disk is made of wear-resistant material.
  • FIG. 2 shows the round shank chisel 10 in the working position.
  • the collar 13 of the chisel head 11 lies against the end face of the chisel holder 20.
  • the holding member 19 is designed as a retaining ring made of a round material.
  • the bore 21 of the chisel holder 20 has the extension 23 in the front side facing the chisel head 11, which receives the retaining ring pushed down by the clamping sleeve 17.
  • the area of the chisel shaft 14 which is free of the clamping sleeve 17 between the clamping sleeve 17 and the chisel head 11 must therefore have at least a width which corresponds to the diameter of the round material used for the retaining ring.
  • the design of the clamping sleeve 17 and the holding ring in the diameters is carried out analogously to the embodiment according to FIG. 1, so that the clamping sleeve 17 preloaded with the holding ring can easily be inserted manually into the bore 21 of the bit holder 20 and that with the clamping sleeve 17 released by the holding ring a sufficiently large clamping force between the clamping sleeve 17 and the bore 21 of the bit holder 20 is achieved.
  • the chisel shaft 14 on the other hand, remains freely rotatable in the clamping sleeve 17, since in the clamping position the inner diameter of the clamping sleeve 17 is larger than the diameter of the chisel shaft 14 in the region of the circumferential groove 15.

Landscapes

  • 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)
  • Percussive Tools And Related Accessories (AREA)
  • Gripping On Spindles (AREA)
EP88100268A 1987-01-23 1988-01-12 Pic à queue ronde Expired - Lifetime EP0275890B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3701905A DE3701905C1 (de) 1987-01-23 1987-01-23 Befestigung eines Rundschaftmeissels
DE3701905 1987-01-23

Publications (2)

Publication Number Publication Date
EP0275890A1 true EP0275890A1 (fr) 1988-07-27
EP0275890B1 EP0275890B1 (fr) 1990-10-10

Family

ID=6319370

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88100268A Expired - Lifetime EP0275890B1 (fr) 1987-01-23 1988-01-12 Pic à queue ronde

Country Status (8)

Country Link
US (1) US4818027A (fr)
EP (1) EP0275890B1 (fr)
JP (1) JP2655267B2 (fr)
AU (1) AU596725B2 (fr)
CA (1) CA1296203C (fr)
DE (1) DE3701905C1 (fr)
ES (1) ES2018053B3 (fr)
ZA (1) ZA88424B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019201536A1 (fr) * 2018-04-17 2019-10-24 Betek Gmbh & Co. Kg Fraise-trépan

Families Citing this family (84)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932723A (en) * 1989-06-29 1990-06-12 Mills Ronald D Cutting-bit holding support block shield
EP0413917A1 (fr) * 1989-08-23 1991-02-27 Kennametal Inc. Outil à couper rotatif de forme cônique avec plaque d'usure posée dessus
WO1991010807A1 (fr) * 1990-01-09 1991-07-25 Kennametal Inc. Meche de coupe empechant la deformation de l'ensemble de douille
JPH0450496U (fr) * 1990-08-28 1992-04-28
DE19630642C2 (de) * 1996-07-30 1999-04-22 Betek Bergbau & Hartmetall Werkzeug für eine Schrämmaschine
DE19720635C2 (de) * 1997-05-16 1999-05-12 Betek Bergbau & Hartmetall Schaftmeißel
DE19821147C2 (de) * 1998-05-12 2002-02-07 Betek Bergbau & Hartmetall Rundschaftmeißel
US6113195A (en) * 1998-10-08 2000-09-05 Sandvik Ab Rotatable cutting bit and bit washer therefor
DE19922320C5 (de) * 1999-05-14 2004-11-25 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Werkzeug für eine Schräm-, Bergbau- oder Straßenfräsmaschine
DE19922318C2 (de) * 1999-05-14 2001-08-16 Betek Bergbau & Hartmetall Bearbeitungswerkzeug für eine Straßenbelag-Bearbeitungsmaschine
DE19933456A1 (de) * 1999-07-16 2001-01-25 Betek Bergbau & Hartmetall Meißel zur Gesteins- und/oder Asphaltzerspanung
US6478383B1 (en) 1999-10-18 2002-11-12 Kennametal Pc Inc. Rotatable cutting tool-tool holder assembly
DE10110015C2 (de) * 2001-03-01 2003-07-17 Betek Bergbau & Hartmetall Verschleißscheibe für Schrämmeißel und Anordnung der Verschleißscheiben auf einem Stanzblechstreifen
US7380888B2 (en) 2001-04-19 2008-06-03 Kennametal Inc. Rotatable cutting tool having retainer with dimples
DE10142438B4 (de) * 2001-07-04 2007-09-13 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Befestigungsanordnung für einen Schaftmeißel
US6824225B2 (en) * 2001-09-10 2004-11-30 Kennametal Inc. Embossed washer
RU2198292C1 (ru) * 2001-11-12 2003-02-10 Леванковский Игорь Анатольевич Устройство для разрушения минеральных и искусственных материалов
US6863352B2 (en) 2002-01-24 2005-03-08 The Sollami Company Rotatable tool assembly
US6851758B2 (en) * 2002-12-20 2005-02-08 Kennametal Inc. Rotatable bit having a resilient retainer sleeve with clearance
DE10305205B4 (de) * 2003-02-07 2006-10-19 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Meißelspitze für einen Schaftmeißel
DE10325253A1 (de) * 2003-06-03 2004-12-23 Gerd Elfgen Halteelement für einen Schaftmeißel einer Fräsvorrichtung
US6962395B2 (en) * 2004-02-06 2005-11-08 Kennametal Inc. Non-rotatable protective member, cutting tool using the protective member, and cutting tool assembly using the protective member
DE102004030691B4 (de) 2004-06-24 2008-12-18 Wirtgen Gmbh Werkzeug-Haltevorrichtung
US7229136B2 (en) * 2004-09-28 2007-06-12 The Sollami Company Non-rotatable wear ring and retainer sleeve for a rotatable tool
DE102004057302B4 (de) 2004-11-26 2011-01-13 Wirtgen Gmbh Meißelhalter
US7150505B2 (en) * 2004-12-14 2006-12-19 The Sollami Company Retainer sleeve and wear ring for a rotatable tool
US20060125308A1 (en) * 2004-12-14 2006-06-15 The Sollami Company Wear ring and extraction device for a rotatable tool
US20060125306A1 (en) * 2004-12-15 2006-06-15 The Sollami Company Extraction device and wear ring for a rotatable tool
DE102005001536B3 (de) * 2005-01-13 2006-01-19 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Werkzeug für eine Schrämmaschine
US20070257545A1 (en) * 2006-05-08 2007-11-08 Sandvik Intelectual Property Ab Cutting tool and method of assembling the cutting tool
DE102007051911B4 (de) * 2007-10-29 2011-06-16 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Schaftmeißel
US8517473B2 (en) * 2008-05-19 2013-08-27 Sandvik Intellectual Property Ab Road grading pick with washer
US8469456B2 (en) 2009-03-25 2013-06-25 Wirtgen Gmbh Ejector unit for a road milling machine or the like
DE102009014729B3 (de) * 2009-03-25 2010-11-04 Wirtgen Gmbh Auswerfer für eine Straßenfräsmaschine oder dergleichen
DE102009014730B3 (de) 2009-03-25 2010-10-28 Wirtgen Gmbh Auswerfer bzw. Auswerfereinheit für eine Straßenfräsmaschine oder dergleichen
US8414084B2 (en) * 2009-07-13 2013-04-09 Sandvik Intellectual Property Ab Adaptive sleeve retainer for tool pick
DE102009049780B4 (de) 2009-10-19 2016-02-18 Betek Gmbh & Co. Kg Meißel, insbesondere Rundschaftmeißel
DE202009014077U1 (de) 2009-10-19 2010-03-25 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Meißel, insbesondere Rundschaftmeißel
US20120013168A1 (en) * 2010-07-14 2012-01-19 The Sollami Company Spring Biased Rotatable Tool
US10598013B2 (en) 2010-08-27 2020-03-24 The Sollami Company Bit holder with shortened nose portion
US9879531B2 (en) 2014-02-26 2018-01-30 The Sollami Company Bit holder shank and differential interference between the shank distal portion and the bit holder block bore
US10385689B1 (en) 2010-08-27 2019-08-20 The Sollami Company Bit holder
US10072501B2 (en) 2010-08-27 2018-09-11 The Sollami Company Bit holder
US10337324B2 (en) 2015-01-07 2019-07-02 The Sollami Company Various bit holders and unitary bit/holders for use with shortened depth bit holder blocks
US11261731B1 (en) 2014-04-23 2022-03-01 The Sollami Company Bit holder and unitary bit/holder for use in shortened depth base blocks
DE102012108935A1 (de) * 2012-09-21 2014-03-27 Thyssenkrupp Resource Technologies Gmbh Anordnung eines Brechzahnes an einer Brechwalze eines Walzenbrechers
US10323515B1 (en) 2012-10-19 2019-06-18 The Sollami Company Tool with steel sleeve member
US9988903B2 (en) 2012-10-19 2018-06-05 The Sollami Company Combination polycrystalline diamond bit and bit holder
US10260342B1 (en) 2012-10-19 2019-04-16 The Sollami Company Combination polycrystalline diamond bit and bit holder
US10180065B1 (en) 2015-10-05 2019-01-15 The Sollami Company Material removing tool for road milling mining and trenching operations
US9909416B1 (en) 2013-09-18 2018-03-06 The Sollami Company Diamond tipped unitary holder/bit
US10107097B1 (en) 2012-10-19 2018-10-23 The Sollami Company Combination polycrystalline diamond bit and bit holder
US10105870B1 (en) 2012-10-19 2018-10-23 The Sollami Company Combination polycrystalline diamond bit and bit holder
US10415386B1 (en) 2013-09-18 2019-09-17 The Sollami Company Insertion-removal tool for holder/bit
US10767478B2 (en) 2013-09-18 2020-09-08 The Sollami Company Diamond tipped unitary holder/bit
US10876402B2 (en) 2014-04-02 2020-12-29 The Sollami Company Bit tip insert
US10968739B1 (en) 2013-09-18 2021-04-06 The Sollami Company Diamond tipped unitary holder/bit
US10577931B2 (en) 2016-03-05 2020-03-03 The Sollami Company Bit holder (pick) with shortened shank and angular differential between the shank and base block bore
US10794181B2 (en) 2014-04-02 2020-10-06 The Sollami Company Bit/holder with enlarged ballistic tip insert
US10633971B2 (en) 2016-03-07 2020-04-28 The Sollami Company Bit holder with enlarged tire portion and narrowed bit holder block
US10995613B1 (en) 2013-09-18 2021-05-04 The Sollami Company Diamond tipped unitary holder/bit
US9976418B2 (en) 2014-04-02 2018-05-22 The Sollami Company Bit/holder with enlarged ballistic tip insert
US10947844B1 (en) 2013-09-18 2021-03-16 The Sollami Company Diamond Tipped Unitary Holder/Bit
US11168563B1 (en) 2013-10-16 2021-11-09 The Sollami Company Bit holder with differential interference
US9028008B1 (en) * 2014-01-16 2015-05-12 Kennametal Inc. Cutting tool assembly including retainer sleeve with compression band
US11339656B1 (en) 2014-02-26 2022-05-24 The Sollami Company Rear of base block
DE102014104040A1 (de) 2014-03-24 2015-09-24 Betek Gmbh & Co. Kg Meißel, insbesondere Rundschaftmeißel
US11339654B2 (en) 2014-04-02 2022-05-24 The Sollami Company Insert with heat transfer bore
US11891895B1 (en) 2014-04-23 2024-02-06 The Sollami Company Bit holder with annular rings
DE102014106484A1 (de) 2014-05-08 2015-11-12 Betek Gmbh & Co. Kg Schaftmeißel bzw. Befestigungsanordnung für einen Schaftmeißel
DE102014112964A1 (de) 2014-09-09 2016-03-10 Betek Gmbh & Co. Kg Meißel, insbesondere Rundschaftmeißel
DE102014112966A1 (de) 2014-09-09 2016-03-31 Betek Gmbh & Co. Kg Vorrichtung mit einem Meißel
US9702251B2 (en) 2015-03-17 2017-07-11 Kennametal Inc. Cutting tool assembly including retainer sleeve with retention member
US10502056B2 (en) 2015-09-30 2019-12-10 The Sollami Company Reverse taper shanks and complementary base block bores for bit assemblies
US10612376B1 (en) 2016-03-15 2020-04-07 The Sollami Company Bore wear compensating retainer and washer
US10107098B2 (en) * 2016-03-15 2018-10-23 The Sollami Company Bore wear compensating bit holder and bit holder block
US10612375B2 (en) 2016-04-01 2020-04-07 The Sollami Company Bit retainer
US10876401B1 (en) 2016-07-26 2020-12-29 The Sollami Company Rotational style tool bit assembly
US10968738B1 (en) 2017-03-24 2021-04-06 The Sollami Company Remanufactured conical bit
US11187080B2 (en) 2018-04-24 2021-11-30 The Sollami Company Conical bit with diamond insert
US11279012B1 (en) 2017-09-15 2022-03-22 The Sollami Company Retainer insertion and extraction tool
JP6636547B2 (ja) * 2018-01-31 2020-01-29 エポコラム機工株式会社 コニカルビット
US11103939B2 (en) 2018-07-18 2021-08-31 The Sollami Company Rotatable bit cartridge
AU201816544S (en) 2018-08-01 2018-11-27 Betek Gmbh & Co Kg A chisel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3144060A1 (de) * 1981-11-06 1983-05-19 Wolfgang 6603 Sulzbach Preinfalk Axialhalterung fuer schraemmeissel
DE3439491A1 (de) * 1984-10-27 1986-04-30 Gerd 5303 Bornheim Elfgen Rundschaftmeissel
DE8701089U1 (de) * 1987-01-23 1987-05-07 Betek Bergbau- und Hartmetalltechnik Karl-Heinz Simon GmbH & Co KG, 7234 Aichhalden Rundschaftmeißel

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US1475136A (en) * 1922-07-03 1923-11-20 Olson Axel Edvard Steel stamp
US2988405A (en) * 1960-05-16 1961-06-13 Gen Electric Self-aligning bearing construction
US3512838A (en) * 1968-08-08 1970-05-19 Kennametal Inc Pick-type mining tool
DE3233123C2 (de) * 1982-09-07 1985-09-19 Wolfgang 6603 Sulzbach Preinfalk Axialhalterung für Rundschaftmeißel
DE8225157U1 (de) * 1982-09-07 1983-09-01 Preinfalk, Wolfgang, 6603 Sulzbach Axialhalterung fuer schraemmeissel
GB8306641D0 (en) * 1983-03-10 1983-04-13 Wimet Mining Ltd Pick holding arrangements
US4660890A (en) * 1985-08-06 1987-04-28 Mills Ronald D Rotatable cutting bit shield
JPS62200790U (fr) * 1986-06-10 1987-12-21

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3144060A1 (de) * 1981-11-06 1983-05-19 Wolfgang 6603 Sulzbach Preinfalk Axialhalterung fuer schraemmeissel
DE3439491A1 (de) * 1984-10-27 1986-04-30 Gerd 5303 Bornheim Elfgen Rundschaftmeissel
DE8701089U1 (de) * 1987-01-23 1987-05-07 Betek Bergbau- und Hartmetalltechnik Karl-Heinz Simon GmbH & Co KG, 7234 Aichhalden Rundschaftmeißel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019201536A1 (fr) * 2018-04-17 2019-10-24 Betek Gmbh & Co. Kg Fraise-trépan

Also Published As

Publication number Publication date
ES2018053B3 (es) 1991-03-16
US4818027A (en) 1989-04-04
DE3701905C1 (de) 1988-09-15
JP2655267B2 (ja) 1997-09-17
ZA88424B (en) 1988-07-07
AU596725B2 (en) 1990-05-10
CA1296203C (fr) 1992-02-25
EP0275890B1 (fr) 1990-10-10
AU1067688A (en) 1988-07-28
JPS63197795A (ja) 1988-08-16

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