EP1216343B1 - Device for detachably fixing a rounded-shaft tool into a tool bushing - Google Patents

Device for detachably fixing a rounded-shaft tool into a tool bushing Download PDF

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Publication number
EP1216343B1
EP1216343B1 EP00967412A EP00967412A EP1216343B1 EP 1216343 B1 EP1216343 B1 EP 1216343B1 EP 00967412 A EP00967412 A EP 00967412A EP 00967412 A EP00967412 A EP 00967412A EP 1216343 B1 EP1216343 B1 EP 1216343B1
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EP
European Patent Office
Prior art keywords
chisel
ring
annular groove
rib
fixing ring
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 - Lifetime
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EP00967412A
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German (de)
French (fr)
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EP1216343A1 (en
Inventor
Roman Gerer
Friedrich Pichlmair
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Sandvik Mining and Construction GmbH
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Voest Alpine Bergtechnik GmbH
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Priority to AT00967412T priority Critical patent/ATE256818T1/en
Publication of EP1216343A1 publication Critical patent/EP1216343A1/en
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    • 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
    • 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
    • E21C35/188—Mining picks; Holders therefor characterised by adaptations to use an extraction tool

Definitions

  • the invention relates to a device for releasable Set a picks in one in a bit holder detachably fixed chisel sleeve, in which the inner jacket the chisel sleeve has an annular groove into which one in a Ring groove of the chisel shank received resilient fastening ring intervenes.
  • Chisel holders for picking round shank chisels are on Cutting heads or cutting rollers with a relatively large diameter arranged. Depending on the speed of rotation of the cutting heads or the cutting rollers act relatively high centrifugal forces. Picks are generally intended to be in the mounting hole or a corresponding chisel sleeve can rotate about its axis, so that a corresponding rotation of the chisel in the sleeve must be approved.
  • a chisel sleeve is force-locking while maintaining an appropriate surface pressure between the conical outer casing of the chisel sleeve and the Inner wall of the mounting hole connected to the chisel holder. Due to the required high surface pressure, which is unintended To prevent loosening of the chisel sleeve was made for a quick detachability of this sleeve provided the possibility press the rifle hydraulically.
  • this known training was the round shank chisel made of spring steel existing clip ring held in the chisel sleeve. An between Chisel bush and round chisel shaft could penetrate dust however, blocking the axial mobility of the round shank chisel lead, resulting in the solution and rapid exchange a damaged chisel was made difficult.
  • the invention now aims, starting from one described device for fastening the round shank chisel in the chisel box to create an apprenticeship at which a clip ring can be used, the one with the least Force can be mounted and on the other hand with Sufficiently absorbs occurring axial forces, to prevent unwanted loosening of the picks which makes it quick and easy to assemble and disassemble all wear parts and especially the round shank chisel is made possible.
  • This safe and quick installation is intended can also be guaranteed with certainty if between chisels and chisel can dust and dirt combined penetrates with water and is at the bottom of the mounting groove settles, whereby the fastener can be blocked.
  • the training according to the invention consists based on the facility mentioned, essentially in that the resilient mounting ring as a slotted Plastic ring is formed and one in the circumferential direction running rib supports that the width of the ring groove on Inner jacket of the sleeve is larger measured in the axial direction than the width of those running in the circumferential direction Ring groove immersed rib of the resilient plastic ring and that the face of the ring rib facing the chisel tip parallel to the end face of this end face Ring groove is arranged on the inner jacket of the sleeve.
  • the training according to the invention is advantageously made such that the width of the annular groove of the chisel shaft in the axial direction measured exceeds the width of the plastic ring.
  • there is a greater axial play for axial displaceability of the chisel in the chisel sleeve whereby penetration of dust and dirt only leads to the fact that the axial displacement of the ring relative to the chisel shaft is affected, but the axial displaceability in the corresponding groove of the chisel sleeve usually exist remains and thus ensures easy disassembly remains.
  • the training is particularly advantageous hit that the depth of the ring groove of the chisel shank the Total thickness of the fastening ring in the area of the ring rib exceeds. This ensures that the clip ring for the Assembly can be reduced in diameter in order to make it easy to move Allow insertion of the chisel into the chisel sleeve.
  • FIG. 1 shows a section through a chisel holder with inserted rifle and chisel with an internal nozzle, in which a nozzle over one by axial displacement of the chisel-actuated valve with cooling medium 2 is an axial view of a round shank chisel with an inserted fastening or clip ring, Fig. 3 Detail of the area of the wall of FIG Rifle and the bit holder and Fig. 4 is a side view of the Clip ring or fastening ring partly in section.
  • FIG. 3 which is a detail of FIG. 1 enlarged in accordance with the area indicated by circle III represents, it can be seen that the mounting ring or clip ring 13 a trapezoidal in cross section in the circumferential direction extending rib 16 carries.
  • the corresponding groove 17 the inner wall of the sleeve 10 is formed larger than that Width of the annular rib 16, so that an axial displacement in Direction of the double arrow 6 is possible.
  • this training is the width a of the fastening ring measured in the axial direction smaller than the width measured in the axial direction b the annular groove 12 of the chisel shank 11.

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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)
  • Workshop Equipment, Work Benches, Supports, Or Storage Means (AREA)
  • Percussive Tools And Related Accessories (AREA)

Description

Die Erfindung bezieht sich auf eine Einrichtung zum lösbaren Festlegen eines Rundschaftmeißels in einer in einem Meißelhalter lösbar festgelegten Meißelbüchse, bei welcher der Innenmantel der Meißelbüchse eine Ringnut aufweist, in welche ein in einer Ringnut des Meißelschaftes aufgenommener federnder Befestigungsring eingreift.The invention relates to a device for releasable Set a picks in one in a bit holder detachably fixed chisel sleeve, in which the inner jacket the chisel sleeve has an annular groove into which one in a Ring groove of the chisel shank received resilient fastening ring intervenes.

Meißelhalter für die Aufnahme von Rundschaftmeißel sind an Schrämköpfen bzw. Schrämwalzen mit relativ großem Durchmesser angeordnet. Je nach Rotationsgeschwindigkeit der Schrämköpfe bzw. der Schrämwalzen wirken relativ hohe Zentrifugalkräfte. Rundschaftmeißel sollen in der Regel in der Aufnahmebohrung bzw. einer entsprechenden Meißelbüchse um ihre Achse rotieren können, sodaß eine entsprechende Verdrehung des Meißels in der Büchse zugelassen werden muß. Wenn zusätzlich beispielsweise im Inneren eines Meißelhalters Ventile angeordnet sind, welche den jeweils im Eingriff stehenden Meißel sowie die zugehörige Schneidspur über eine jeweils zugeordnete Düse zu kühlen erlauben, ist auch eine axiale Verschiebbarkeit des Meißels in der Meißelbüchse erforderlich, um das entsprechende Ventil zu betätigen. Sowohl die Meißelbüchse als auch die Meißel selbst sind nun einem hohen Verschleiß unterworfen und müssen bei unzulässigem Verschleiß getauscht werden. Der Zeitaufwand für einen derartigen Meißeltausch soll naturgemäß so gering wie nur möglich sein. Um einen Meißel aus seiner zugehörigen Meißelbüchse abziehen zu können, muß ein entsprechender axialer Verschiebeweg sichergestellt werden, welcher den Einsatz eines entsprechenden Abziehwerkzeuges zum raschen Wechsel des Meißels ermöglicht. Bedingt durch die zulässigen Verschiebe- und Verdrehbewegungen wirken bei der Rotation des Schrämkopfes oder der Schrämwalze auch außerhalb des eigentlichen Eingriffes des Meißels in das Gestein Schlagkräfte auf die Halterung bzw. die Büchse. Die entsprechende Einrichtung zum Festlegen des Rundschaftmeißels sowie die entsprechende Flächenpressung der Meißelbüchse im Meißelhalter muß naturgemäß so gewählt werden, daß diese Schläge nicht zu einem unzulässigen Lösen des Meißels führen. Aufgrund dieses Spiels gelangt aber nun auch Gesteinsstaub in die Meißelbüchse und damit auch in den Bereich der Meißelfestlegung, welche üblicherweise von einem federnden Befestigungsring gebildet ist (z.B. in der US-A- 5 370 448 ist ein Befestigungsring gebildet) sodaß ein auf diese Weise eingedrungener Staub die axiale Verschiebbarkeit zum Zwecke eines raschen Lösens eines schadhaften Meißels erheblich einschränken kann oder sogar verhindern kann.Chisel holders for picking round shank chisels are on Cutting heads or cutting rollers with a relatively large diameter arranged. Depending on the speed of rotation of the cutting heads or the cutting rollers act relatively high centrifugal forces. Picks are generally intended to be in the mounting hole or a corresponding chisel sleeve can rotate about its axis, so that a corresponding rotation of the chisel in the sleeve must be approved. If in addition, for example, inside a bit holder valves are arranged, which each engaged chisel as well as the associated cutting track Allowing to cool via a respectively assigned nozzle is also possible Axial displacement of the chisel in the chisel sleeve is required to operate the corresponding valve. Both the Chisel rifle as well as the chisel itself are now high Subject to wear and tear in the event of impermissible wear it will be exchanged. The time required for such a bit change should naturally be as low as possible. To one To be able to pull the chisel out of its associated chisel sleeve, a corresponding axial displacement path must be ensured, which the use of an appropriate pulling tool allows for quick change of the chisel. Due to the permissible displacement and twisting movements are effective during rotation the cutting head or the cutting roller also outside the actual engagement of the chisel in the rock on the bracket or the sleeve. The appropriate facility to set the pick and the corresponding one Naturally, the surface pressure of the chisel bush in the chisel holder must be be chosen so that these punches do not become an impermissible Loosen the chisel. Because of this game, however now also stone dust in the chisel box and thus also in the Area of chisel fixing, which is usually from a resilient Fastening ring is formed (e.g. a mounting ring is formed in US-A-5 370 448) so one this way ingressed dust the axial displacement for the purpose of a limit the rapid loosening of a damaged chisel can or can even prevent.

In der AT 404 969 B ist bereits eine Lösung für den raschen Austausch einer verschlissenen Meißelbüchse vorgeschlagen worden. Bei dieser bekannten Ausbildung ist eine Meißelbüchse kra ftschlüssig unter Einhaltung eines entsprechenden Flächendruckes zwischen dem konischen Außenmantel der Meißelbüchse und der Innenwand der Aufnahmebohrung mit dem Meißelhalter verbunden. Aufgrund der geforderten hohen Flächenpressung, welche unbeabsichtigtes Lösen der Meißelbüchse verhindern soll, wurde für eine rasche Lösbarkeit dieser Büchse die Möglichkeit vorgesehen, die Büchse hydraulisch auszupressen. Bei dieser bekannten Ausbildung war der Rundschaftmeißel über einen aus Federstahl bestehenden Clippring in der Meißelbüchse gehalten. Ein zwischen Meißelbüchse und Rundmeißelschaft eindringender Staub konnte jedoch zu einem Blockieren der axialen Bewegbarkeit des Rundschaftmeißels führen, wodurch die Lösung und der rasche Austausch eines schadhaft gewordenen Meißels erschwert wurde.AT 404 969 B already has a solution for quick exchange a worn chisel can. In this known design, a chisel sleeve is force-locking while maintaining an appropriate surface pressure between the conical outer casing of the chisel sleeve and the Inner wall of the mounting hole connected to the chisel holder. Due to the required high surface pressure, which is unintended To prevent loosening of the chisel sleeve was made for a quick detachability of this sleeve provided the possibility press the rifle hydraulically. In this known training was the round shank chisel made of spring steel existing clip ring held in the chisel sleeve. An between Chisel bush and round chisel shaft could penetrate dust however, blocking the axial mobility of the round shank chisel lead, resulting in the solution and rapid exchange a damaged chisel was made difficult.

In der EP 201 073 B1 wurde zum Zwecke der Festlegung des Meißels ein aus elastischem Kunststoff bestehender Ring in Verbindung mit einem Hartmetallring vorgeschlagen, wobei der Hartmetall r ing die Befestigung des Meißels im Meißelhalter bewirken soll. Die gewählte Ausbildung erforderte allerdings eine durchgehende Aufnahmebohrung im Meißelhalter, da die Montage und Demontage des Meißels nur bei einem Zugang zu dem entsprechenden Hartmetallring von der Rückseite her möglich war.In EP 201 073 B1 for the purpose of fixing the chisel a ring made of elastic plastic in connection proposed with a hard metal ring, the hard metal r ing to fix the chisel in the chisel holder. The selected training, however, required a continuous mounting hole in the chisel holder because the assembly and disassembly of the Chisels only with access to the corresponding carbide ring was possible from the back.

In der WO 95/27840 wird neben einem konventionellen geschlitzten Clippring aus Metall als Verbesserung ein Kunststoffring vorgeschlagen. Der Kunststoffring mußte aus hochelastischem Kunststoff bestehen, da die elastische Hülse gedehnt werden muß, um über das hintere Ende des Rundschaftmeißels aufgepreßt zu werden. Nach dem Aufpressen des Kunststoffringes unter elastischer Aufweitung des hülsenförmigen Bauteiles, gelangt diese elastische Hülse in eine entsprechende Umfangsnut am Meißelschaft. Zum Abziehen des Meißels mußte hiebei in aller Regel die vorspringende Ringrippe abgeschert werden, wodurch relativ hohe Anforderungen an die Qualität des Materials der elastischen Hülse mit der Ringrippe gestellt werden, wenn ein ungewolltes Lösen des Rundschaftmeißels mit Sicherheit verhindert werden soll.In WO 95/27840 in addition to a conventional slotted Metal clip ring proposed as an improvement to a plastic ring. The plastic ring had to be made of highly elastic plastic exist because the elastic sleeve must be stretched to to be pressed over the rear end of the round shank chisel. After pressing the plastic ring under elastic Widening of the sleeve-shaped component, this is elastic Sleeve in a corresponding circumferential groove on the chisel shaft. To the Removing the chisel usually had to be the projecting one Ring rib are sheared off, which makes relatively high demands to the quality of the material of the elastic sleeve with the ring rib if there is an unwanted loosening of the Picks are to be prevented with certainty.

Die Erfindung zielt nun darauf ab, ausgehend von einer eingangs beschriebenen Einrichtung zur Befestigung des Rundschaftmeißels in der Meißelbüchse, eine Ausbildung zu schaffen, bei welcher ein Clippring Verwendung finden kann, der einerseits mit geringstem Kraftaufwand montiert werden kann und andererseits mit Sicherheit auch auftretende axiale Kräfte ausreichend aufnimmt, um ein ungewolltes Lösen des Rundschaftmeißels zu verhindern, womit insgesamt eine rasche und leichte Montage sowie Demontage aller Verschleißteile und insbesondere des Rundschaftmeißels ermöglicht wird. Diese sichere und rasche Montage soll dabei auch dann mit Sicherheit gewährleistet sein, wenn zwischen Rundschaftmeißel und Meißelbüchse Staub und Schmutz in Verbindung mit Wasser eindringt und sich am Grund der Befestigungsnut absetzt, wobei das Befestigungselement blockiert werden kann.The invention now aims, starting from one described device for fastening the round shank chisel in the chisel box to create an apprenticeship at which a clip ring can be used, the one with the least Force can be mounted and on the other hand with Sufficiently absorbs occurring axial forces, to prevent unwanted loosening of the picks which makes it quick and easy to assemble and disassemble all wear parts and especially the round shank chisel is made possible. This safe and quick installation is intended can also be guaranteed with certainty if between chisels and chisel can dust and dirt combined penetrates with water and is at the bottom of the mounting groove settles, whereby the fastener can be blocked.

Zur Lösung dieser Aufgabe besteht die erfindungsgemäße Ausbildung, ausgehend von der eingangs genannten Einrichtung, im wesentlichen darin, daß der federnde Befestigungsring als geschlitzter Kunststoffring ausgebildet ist und eine in Umfangsrichtung verlaufende Rippe trägt, daß die Breite der Ringnut am Innenmantel der Büchse in axialer Richtung gemessen größer ist als die Breite der in Umfangsrichtung verlaufenden in diese Ringnut eintauchenden Rippe des federnden Kunststoffringes und daß die der Meißelspitze zugewandte Stirnfläche der Ringrippe parallel zu der dieser Stirnfläche zugewandten Stirnfläche der Ringnut am Innenmantel der Büchse angeordnet ist. Dadurch, daß der federnde Befestigungsring als geschlitzter Kunststoffring ausgebildet ist, können entsprechende formstabile Kunststoffr inge Verwendung finden, deren Elastizität beim Einsetzen in die entsprechende Nut des Schaftes durch die geschlitzte Ausbildung gewährleistet ist. Dadurch, daß nun die Breite der Ringnut am Innenmantel der Büchse in axialer Richtung gemessen größer ist als die Breite der in Umfangsrichtung verlaufenden in diese Ringnut eintauchenden Rippe des federnden Kunststoffringes, wird nun sichergestellt, daß auch dann, wenn Staub und Schmutz in Verbindung mit Wasser eingedrungen ist und eine axiale Verschiebbarkeit des Befestigungsringes in der entsprechenden Aufnahmenut des Schaftes nicht mehr gewährleistet ist, eine entsprechende axiale Verschiebbarkeit des Meißels erzielt werden kann, welche den Angriff eines Werkzeuges ermöglicht, um auf diese Weise den Meißel rasch zu wechseln. Dadurch, daß nun die der Meißelspitze zugewandte Stirnfläche der Ringrippe parallel zu der dieser Stirnfläche zugewandten Stirnfläche der Ringnut am Innenmantel der Büchse angeordnet ist, wird ein entsprechender Anschlag ausgebildet, welcher auch bei hohen axialen Kräften aufgrund der Zentrifugalkraft eine sichere Festlegung des Meißels in der Büchse gewährleistet.To achieve this object, the training according to the invention consists based on the facility mentioned, essentially in that the resilient mounting ring as a slotted Plastic ring is formed and one in the circumferential direction running rib supports that the width of the ring groove on Inner jacket of the sleeve is larger measured in the axial direction than the width of those running in the circumferential direction Ring groove immersed rib of the resilient plastic ring and that the face of the ring rib facing the chisel tip parallel to the end face of this end face Ring groove is arranged on the inner jacket of the sleeve. As a result of that the resilient mounting ring as a slotted plastic ring is formed, appropriate dimensionally stable plastics inge Find use whose elasticity when inserted into the corresponding groove of the shaft through the slotted design is guaranteed. The fact that now the width of the annular groove on Inner jacket of the sleeve is larger measured in the axial direction than the width of those running in the circumferential direction Ring groove immersed rib of the resilient plastic ring, will now ensures that even when dust and dirt are in Connection with water has penetrated and is axially displaceable of the fastening ring in the corresponding receiving groove the shaft is no longer guaranteed, a corresponding axial displaceability of the chisel can be achieved which allows a tool to attack on this way to change the chisel quickly. Because now face of the ring rib facing the chisel tip parallel to the end face of the annular groove facing this end face Inner casing of the sleeve is arranged, a corresponding Stop formed, which even with high axial forces due to the centrifugal force a safe determination of the Chisels guaranteed in the can.

Mit Vorteil ist die erfindungsgemäße Ausbildung so getroffen, daß die Breite der Ringnut des Meißelschaftes in axialer Richtung gemessen die Breite des Kunststoffringes übersteigt. Auf diese Weise wird ein größeres axiales Spiel für eine axiale Verschiebbarkeit des Meißels in der Meißelbüchse zugelassen, wobei ein Eindringen von Staub und Schmutz lediglich dazu führt, daß die axiale Verschiebbarkeit des Ringes relativ zum Meißelschaft beeinträchtigt wird, wobei jedoch die axiale Verschiebbarkeit in der entsprechenden Nut der Meißelbüchse in aller Regel bestehen bleibt und auf diese Weise eine einfache Demontage gewährleistet bleibt.The training according to the invention is advantageously made such that the width of the annular groove of the chisel shaft in the axial direction measured exceeds the width of the plastic ring. On this way there is a greater axial play for axial displaceability of the chisel in the chisel sleeve, whereby penetration of dust and dirt only leads to the fact that the axial displacement of the ring relative to the chisel shaft is affected, but the axial displaceability in the corresponding groove of the chisel sleeve usually exist remains and thus ensures easy disassembly remains.

Mit Vorteil besteht der federnde Befestigungsring aus Polyacetal und insbesondere Polyacetalcopolymerisat. Derartige Kunststoffringe können die mechanische Beanspruchung im Hinblick auf Abriebfestigkeit, Härtesteifigkeit und das geforderte Federungsvermögen sicher aufnehmen, ohne daß die geforderte Haltekraft beeinträchtigt wird. Besonders bevorzugt sind hiebei Ausbildungen, bei welchen der federnde Kunststoffring Zusätze von MoS2 und/oder PTFE enthält und/oder durch Einlagen aus Stahldraht oder Glasfasern armiert ist.The resilient fastening ring advantageously consists of polyacetal and in particular polyacetal copolymer. Such plastic rings can safely absorb the mechanical stress with regard to abrasion resistance, hardness stiffness and the required resilience without the required holding force being impaired. Particularly preferred are designs in which the resilient plastic ring contains additions of MoS 2 and / or PTFE and / or is reinforced by inserts made of steel wire or glass fibers.

Das Aufschieben des Befestigungsringes bzw. Clippringes auf den Schaft des Rundschaftmeißels wird, wie bereits erwähnt, durch den entsprechenden Schlitz dieses Ringes erleichtert, wobei mit Vorzug die Ausbildung so getroffen ist, daß der quer zur Umfangsrichtung des Befestigungsringes verlaufende Schlitz einen Winkel von 30° bis 60°, insbesondere etwa 45° mit der Umfangsrichtung einschließt.Sliding the fastening ring or clip ring onto the As already mentioned, the shank of the round shank chisel is through the corresponding slot of this ring facilitated, with Preferred training is taken so that the cross Circumferential direction of the fastening ring extending slot Angles from 30 ° to 60 °, in particular approximately 45 ° with the circumferential direction includes.

Mit Vorteil weist die in Umfangsrichtung verlaufende Rippe des Befestigungsringes ebenso wie die Ringnut am Innenmantel der Buchse trapezförmigen Querschnitt auf, wobei in besonders vorteilhafter Weise die der Meißelspitze zugewandte Stirnfläche der Rippe des Befestigungsringes einen Winkel zwischen 0° und 60°, insbesondere etwa 45° mit der Querschnittsebene des Befestigungsringes einschließt. Auf diese Weise wird sichergestellt, daß auch durch schlagartig auftretende axiale Kräfte in Richtung eines Lösens des Rundschaftmeißels ein ungewolltes Lösen mit Sicherheit verhindert wird.The circumferential rib of the Fastening ring as well as the ring groove on the inner jacket of the Socket trapezoidal cross-section, being particularly advantageous Way the end face of the chisel tip Rib of the fastening ring an angle between 0 ° and 60 °, in particular about 45 ° with the cross-sectional plane of the fastening ring includes. This ensures that also by sudden axial forces in the direction loosening the round shank chisel with an unwanted loosening Security is prevented.

In besonders vorteilhafter Weise ist die Ausbildung so getroffen, daß die Tiefe der Ringnut des Meißelschaftes die Gesamtdicke des Befestigungsringes im Bereich der Ringrippe übersteigt. Dadurch ist gewährleistet, daß der Clippring für die Montage im Durchmesser derart verkleinerbar wird, um ein leichtgängiges Einführen des Meißels in die Meißelbüchse zu ermöglichen.The training is particularly advantageous hit that the depth of the ring groove of the chisel shank the Total thickness of the fastening ring in the area of the ring rib exceeds. This ensures that the clip ring for the Assembly can be reduced in diameter in order to make it easy to move Allow insertion of the chisel into the chisel sleeve.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispieles näher erläutert. The invention is described below with reference to a drawing schematically illustrated embodiment.

In dieser zeigen Fig. 1 einen Schnitt durch einen Meißelhalter mit eingesetzter Büchse und eingesetztem Meißel mit einer Innenbedüsung, bei welcher eine Düse über ein durch axiale Verschiebung des Meißels betätigbares Ventil mit Kühlmedium beaufschlagt werden kann, Fig. 2 eine axiale Ansicht auf einen Rundschaftmeißel mit eingelegtem Befestigungs- bzw. Klippring, Fig. 3 ein Detail des in Fig. 1 mit 3 bezeichneten Bereiches der Wand der Büchse und des Meißelhalters und Fig. 4 eine Seitenansicht des Klippringes bzw. Befestigungsringes teilweise im Schnitt.1 shows a section through a chisel holder with inserted rifle and chisel with an internal nozzle, in which a nozzle over one by axial displacement of the chisel-actuated valve with cooling medium 2 is an axial view of a round shank chisel with an inserted fastening or clip ring, Fig. 3 Detail of the area of the wall of FIG Rifle and the bit holder and Fig. 4 is a side view of the Clip ring or fastening ring partly in section.

In Fig. 1 ist mit 1 ein Meißelhalter bezeichnet, welcher über eine Schweißnaht 2 am Umfang eines Schrämkopfes bzw. einer Schrämtrommel 3 festgelegt ist. Der Meißelhalter enthält bei der Darstellung nach Fig. 1 ein Ventil 4, welches durch axiale Verschiebung des Rundschaftmeißels 5 in Richtung des Doppelpfeiles 6 betätigt werden kann und die Zufuhr eines Druckmediums über den Kanal 7 und eine Düse 8 freigibt oder verschließt. Am Meißelhalter ist ein weiterer Drückmittelanschluß 9 vorgesehen, welcher in einem Ringkanal zwischen Meißelhalter 1 und der in dem Meißelhalter eingesetzten Büchse 10 mündet, sodaß nach Herausnehmen des Meißels 5 die Meißelbüchse 10 hydraulisch ausgepreßt werden kann. Der Meißelschaft 11 des Meißels 5 weist eine Ringnut 12 auf, in welche ein Befestigungs- bzw. Clippring 13 eingesetzt wird, um den Meißel 5 in der Büchse 10 zu halten. Durch axiale Verschiebung des Meißels 5 in Richtung des Doppelpfeiles 6 kann der die Büchse 10 übergreifende Ringbord 14 entsprechend von der Büchse 10 abgehoben werden, sodaß ein Werkzeug angesetzt werden kann, über welches der Meißel 5 aus der Büchse 10 abgezogen werden kann.In Fig. 1, 1 denotes a chisel holder, which over a weld 2 on the circumference of a cutting head or one Cutting drum 3 is set. The chisel holder contains the 1 shows a valve 4, which by axial displacement of the round shank 5 in the direction of the double arrow 6 can be operated and the supply of a print medium via the channel 7 and a nozzle 8 releases or closes. At the A further pressure medium connection 9 is provided for the chisel holder, which in an annular channel between the chisel holder 1 and the in the bit holder 10 inserted opens so that after removal of the chisel 5, the chisel sleeve 10 is pressed out hydraulically can be. The chisel shaft 11 of the chisel 5 has one Ring groove 12 into which a fastening or clip ring 13 is used to hold the chisel 5 in the sleeve 10. By axially moving the chisel 5 in the direction of the double arrow 6, the sleeve 10 overlapping the ring flange 14 can accordingly be lifted from the sleeve 10 so that a tool can be applied, through which the chisel 5 from the can 10 can be deducted.

In der Darstellung nach Fig. 2 ist schematisch die Anordnung des Clippringes 13 im Inneren der Nut 12 des Meißelschaftes 11 des Meißels 5 näher verdeutlicht. Der Meißel selbst kann hiebei mit einer Hartmaterialspitze 15 versehen sein.2, the arrangement of the Clip ring 13 inside the groove 12 of the chisel shaft 11 of the Chisel 5 clarified. The chisel itself can help with this be provided with a hard material tip 15.

Bei der Darstellung nach Fig. 3, welche ein Detail der Fig. 1 entsprechend dem durch den Kreis III angedeuteten Bereich vergrößert darstellt, ist ersichtlich, daß der Befestigungsring bzw. Clippring 13 eine im Querschnitt trapezförmige in Umfangsrichtung verlaufende Rippe 16 trägt. Die entsprechende Nut 17 an der Innenwand der Büchse 10 ist größer ausgebildet als die Breite der Ringrippe 16, sodaß eine axiale Verschiebbarkeit in Richtung des Doppelpfeiles 6 möglich ist. Bei dieser Ausbildung ist die in axialer Richtung gemessene Breite a des Befestigungsringes kleiner als die in axialer Richtung gemessene Breite b der Ringnut 12 des Meißelschaftes 11. In dem Spalt zwischen Büchse 10 und Meißelschaft 11 sowie dem entsprechend breiteren Bereich der Ringnut 12 kann nun Staub eindringen, sodaß die axiale Verschiebbarkeit des Befestigungsringes 13 in der entsprechenden Nut 12 des Meißelschaftes 11 blockiert werden kann. In diesen Fällen bleibt aber immer noch die axiale Verschiebbarkeit der Ringrippe 16 in der Nut 17 der Meißelbüchse 10 bestehen, sodaß ein sicheres Abziehen des Meißels 5 unter Verwendung eines entsprechenden Werkzeuges erleichtert wird. Die der Meißelspitze zugewandte Schrägfläche bzw. Stirnfläche 18 der Ringrippe 16 verläuft hiebei parallel zu der entsprechenden Schrägfläche der Nut 17, sodaß ein entsprechender Flächenkontakt gewährleistet ist, welcher ein unbeabsichtigtes Lösen des Meißels verhindert.3, which is a detail of FIG. 1 enlarged in accordance with the area indicated by circle III represents, it can be seen that the mounting ring or clip ring 13 a trapezoidal in cross section in the circumferential direction extending rib 16 carries. The corresponding groove 17 the inner wall of the sleeve 10 is formed larger than that Width of the annular rib 16, so that an axial displacement in Direction of the double arrow 6 is possible. With this training is the width a of the fastening ring measured in the axial direction smaller than the width measured in the axial direction b the annular groove 12 of the chisel shank 11. In the gap between Rifle 10 and chisel shank 11 and the correspondingly wider The area of the annular groove 12 can now penetrate dust, so that the axial displacement of the mounting ring 13 in the corresponding Groove 12 of the chisel shaft 11 can be blocked. In these cases, however, the axial displacement still remains the ring rib 16 in the groove 17 of the chisel sleeve 10, so that safe removal of the chisel 5 using an appropriate tool is facilitated. The the Chisel tip facing inclined surface or end face 18 of the Ring rib 16 runs parallel to the corresponding one Inclined surface of the groove 17, so that a corresponding surface contact is guaranteed, which an unintentional loosening of the Chisel prevented.

Bei der Ausbildung nach Fig. 4 ist die geschlitzte Ausbildung des Clippringes bzw. Befestigungsringes 13 ersichtlich, wobei der schräg zur Querschnittsebene 19 des Befestigungsringes verlaufende Schlitz mit 20 angedeutet ist. Die beiden zueinander konvergenten Kanten des trapezförmigen Querschnittes der Rippe 16 schließen hiebei einen Winkel von etwa 90° ein und verlaufen daher unter einem Winkel von etwa 45° zur Querschnittsebene 19 des Ringes 13.4 is the slotted formation of the clip ring or fastening ring 13 can be seen, wherein the oblique to the cross-sectional plane 19 of the mounting ring Slot is indicated with 20. The two to each other convergent edges of the trapezoidal cross-section of the rib 16 enclose an angle of approximately 90 ° and run therefore at an angle of approximately 45 ° to the cross-sectional plane 19 of the ring 13.

Claims (8)

  1. A means for the separable fixing of a round shank chisel in a chisel socket (10) which is separably fixed in a chisel holder (1) and in which the inner shell of the socket (10) has an annular groove (17) into which a springingly resilient fixing ring (13) housed in an annular groove (12) of the chisel shank (11) engages, characterised in that the springingly resilient fixing ring (13) is constructed as a slotted synthetic plastics ring and carries a rib (16) extending in the peripheral direction and in that the width of the annular groove (17) on the inner shell of the socket (10) when measured in the axial direction is greater than the width of the rib (16) on the springingly resilient synthetic plastics ring ( 13 ) which, extending in the peripheral direction, is embedded in this annular groove (17) and in that the end face (18) of the annular rib (16) which is towards the chisel tip (15) is disposed parallel with the end face of the annular groove (17) on the inner shell of the socket (10) which is towards this end face (18).
  2. A means according to claim 1, characterised in that the width of the annular groove (12) on the chisel shank (11), when measured in the axial direction, exceeds the width of the synthetic plastics ring (13).
  3. A means according to claim 1 or 2, characterised in that the springingly resilient fixing ring (13) consists of polyacetyl and in particular polyacetyl copolymer.
  4. A means according to claim 1, 2 or 3, characterised in that the springingly resilient synthetic plastics ring (13) contains additives of MoS2 and/or PTFE and/or is reinforced by inserts of steel wire or glass fibres.
  5. A means according to one of claims 1 to 4, characterised in that the slot (20) extending crosswise to the peripheral direction (19) of the fixing ring (13) encloses an angle of 30° to 60° and in particular approximately 45° with the peripheral direction (19).
  6. A means according to one of claims 1 to 5, characterised in that the rib (16) on the fixing ring (13) which extends in a peripheral direction, and also the annular groove ( 17) on the inner shell of the socket (10) are of trapezoidal cross-section.
  7. A means according to one of claims 1 to 6, characterised in that the end face (18) of the rib (16) on the fixing ring (13) which is towards the chisel tip (15) encloses an angle of between 0° and 60° and particularly approximately 45°, with the cross-sectional plane of the fixing ring ( 13 ).
  8. A means according to one of claims 1 to 7, characterised in that the depth of the annular groove (12) in the chisel shank (11) exceeds the total thickness ofthe fixing ring (13) in the region of the annular rib (16).
EP00967412A 1999-09-28 2000-09-26 Device for detachably fixing a rounded-shaft tool into a tool bushing Expired - Lifetime EP1216343B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT00967412T ATE256818T1 (en) 1999-09-28 2000-09-26 DEVICE FOR RESOLVABLY FIXING A ROUND SHAFT CHISEL IN A CHISEL BUSH

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT166299 1999-09-28
AT166299 1999-09-28
PCT/AT2000/000257 WO2001023708A1 (en) 1999-09-28 2000-09-26 Device for detachably fixing a rounded-shaft tool into a tool bushing

Publications (2)

Publication Number Publication Date
EP1216343A1 EP1216343A1 (en) 2002-06-26
EP1216343B1 true EP1216343B1 (en) 2003-12-17

Family

ID=3518278

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00967412A Expired - Lifetime EP1216343B1 (en) 1999-09-28 2000-09-26 Device for detachably fixing a rounded-shaft tool into a tool bushing

Country Status (5)

Country Link
EP (1) EP1216343B1 (en)
AU (1) AU7761200A (en)
DE (1) DE50004816D1 (en)
ES (1) ES2176129T3 (en)
WO (1) WO2001023708A1 (en)

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DE102006029300B3 (en) * 2006-06-23 2007-11-29 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Round shaft chisel fits into chuck, in which it can rotate, inner contour of chuck and outer contour of shaft allowing chisel to swivel about its longitudinal axis

Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
AT501635B1 (en) * 2005-04-14 2007-07-15 Exel Robert Ing PLASTIC RING FOR SOLDERING A CIRCULAR MEISSEL IN A CHISEL
EA022525B1 (en) * 2010-12-17 2016-01-29 Эско Уиндбер Инк. Holder block assembly for a cutting tool having a hydraulic piston and method of extracting a sleeve with a cutting tool
DE102015002712A1 (en) * 2014-03-10 2015-09-10 Bomag Gmbh Round shank chisel assembly, circlip for a round shank chisel assembly, set with a collet and circlip, and method for securing a shank chisel in a chisel holder
US9765618B2 (en) 2015-01-28 2017-09-19 Joy Mm Delaware, Inc. Cutting bit assembly
DE202015009200U1 (en) * 2015-11-06 2016-12-23 Betek Gmbh & Co. Kg Tooling system

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US3519309A (en) * 1965-08-12 1970-07-07 Kennametal Inc Rotary cone bit retained by captive keeper ring
US3767266A (en) * 1970-08-10 1973-10-23 Cincinnati Mine Machinery Co Resilient retaining means for connecting work tools and work tool holders
US4247147A (en) * 1979-11-21 1981-01-27 Sandvik Aktiebolag Retainer clip for cutter bits
US4484783A (en) * 1982-07-22 1984-11-27 Fansteel Inc. Retainer and wear sleeve for rotating mining bits
DE3401243A1 (en) * 1983-02-08 1984-08-09 Jürgen 4320 Hattingen Jädke Shank-type pick for the working of rocks and minerals
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US5370448A (en) * 1993-05-17 1994-12-06 Cincinnati Mine Machinery Company Wedging arrangement for attaching a bit holder to the base member of a mining road working, or earth moving machine
AT404969B (en) * 1993-12-01 1999-04-26 Voest Alpine Bergtechnik CHISEL HOLDER WITH A DETACHABLE CHISEL CAN
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Publication number Priority date Publication date Assignee Title
DE102006029300B3 (en) * 2006-06-23 2007-11-29 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Round shaft chisel fits into chuck, in which it can rotate, inner contour of chuck and outer contour of shaft allowing chisel to swivel about its longitudinal axis
US7490912B2 (en) 2006-06-23 2009-02-17 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Round shaft chisel

Also Published As

Publication number Publication date
ES2176129T1 (en) 2002-12-01
EP1216343A1 (en) 2002-06-26
WO2001023708A1 (en) 2001-04-05
ES2176129T3 (en) 2004-06-16
DE50004816D1 (en) 2004-01-29
AU7761200A (en) 2001-04-30

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