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EP2160274A1 - Shank chisel - Google Patents

Shank chisel

Info

Publication number
EP2160274A1
EP2160274A1 EP08773352A EP08773352A EP2160274A1 EP 2160274 A1 EP2160274 A1 EP 2160274A1 EP 08773352 A EP08773352 A EP 08773352A EP 08773352 A EP08773352 A EP 08773352A EP 2160274 A1 EP2160274 A1 EP 2160274A1
Authority
EP
European Patent Office
Prior art keywords
shank
chisel
clamping sleeve
bit
extension
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
EP08773352A
Other languages
German (de)
French (fr)
Other versions
EP2160274B1 (en
Inventor
Thomas WÖHRSTEIN
Thomas Lehnert
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 EP2160274A1 publication Critical patent/EP2160274A1/en
Application granted granted Critical
Publication of EP2160274B1 publication Critical patent/EP2160274B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B28D1/186—Tools therefor, e.g. having exchangeable cutter bits
    • B28D1/188—Tools therefor, e.g. having exchangeable cutter bits with exchangeable cutter bits or cutter segments
    • 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
    • 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 shank bit having a chisel head and a chisel shank, wherein the chisel shank carries a clamping sleeve, in which the chisel shank is held captive in the direction of its longitudinal axis and freely rotatable about its longitudinal axis.
  • shank bits are known in many variants. They are commonly used in mining machines, road milling machines, and the like for removing tar, rocks, etc.
  • the shank bits are mounted in chisel holders, which are held on a milling drum of the machine.
  • the bit holders have a bore as a bit holder.
  • the chisel shaft is inserted with its clamping sleeve.
  • the clamping sleeve resiliently braced against the inner wall of the bit holder.
  • the shank bit is captive in the clamping sleeve in the direction of its longitudinal axis, but kept freely rotatable.
  • a chisel tip held on the chisel head is passed over the material to be removed and wears together with the chisel head.
  • the shank bit When the wear limit is reached, the shank bit must be replaced.
  • an axial force To overcome the clamping force of the clamping sleeve, an axial force must be introduced into the shank bit.
  • various tools are known that can be used for this purpose.
  • WO 97/23 710 describes a tool in which a pin-shaped Abd Wegabêt is coupled to a handle by means of a hinge connection. The tool is used to disassemble a shank bit.
  • the Abdrückabites is inserted through the rear opening of the bit holder and brought to the free end of the drill collar to the plant.
  • the handle can then be pivoted until it comes to rest on a support section. Now the handle can be adjusted relative to the Abdschreibabêt in the joint.
  • the resulting lever forces are introduced into the chisel in such a way via the push-off section that the securing effected by the clamping sleeve is released.
  • a new unspiked shank bit can be attached to the receiving bore and driven in with a hammer.
  • the change of a shank bit with the known arrangement requires considerable effort and can not be carried out safely in confined spaces.
  • This object is achieved in that the drill collar carries a shaft extension at its end facing away from the bit head, that the shaft extension has a tool holder, and that the tool holder via a relative to the lateral surface of the drill collar and / or against the lateral surface of the clamping sleeve recessed distance range of the shaft extension in Chisel axis direction is accessible.
  • This design ensures that an actuator of a tool can be guided in the distance range.
  • a tool attachment is inserted into the tool holder, and a section of the actuator adjoining the tool attachment is guided through the clearance region.
  • the distance range allows the actuator to pass through the receiving bore with tooling inserted into the tool holder.
  • the distance region between the lateral surface of the cylindrical drill shank, which has a first diameter and an end portion of the shaft extension is formed, having a second diameter, wherein the second diameter is smaller than the first Diameter.
  • the distance range is formed in the region of the diameter offset.
  • the tool holder can be formed by a circumferential groove. This makes the shank bit easy to manufacture as a turned part.
  • the shaft extension has a retraction portion and a Ausd Wegabites, which are aligned transversely to the central longitudinal axes of the Schaftm justifyels. In this way form transverse to the mounting or dismounting direction undercut Formflä- surfaces that allow for a secure assembly or disassembly a positive engagement of the tool.
  • a shank bit according to the invention may be such that the chisel shank and / or the shank extension are transferred via a chamfer in the tool holder.
  • a wear protection disc is mounted on the clamping sleeve, which holds the clamping sleeve in a biasing state, that the wear protection disc from the clamping sleeve in the direction of the chisel head is pushed off, and that the deported wear protection disc in a between the chisel head and the clamping sleeve formed transition portion of the drill collar is arranged and the clamping sleeve releases.
  • the prestressed with the wear protection disc clamping sleeve can be easily mounted with the tool according to the invention.
  • Figure 1 in side view and partially in section a shank bit, prepared for mounting in a chisel holder and
  • FIG. 1 shows the bit holder according to Figure 1 in a perspective view
  • a shank bit with a chisel head 10 and a chisel shank 20 is shown.
  • the chisel head 10 has a receptacle into which a chisel tip 12 is inserted and soldered therein.
  • the chisel tip 12 is usually made of hard metal.
  • the chisel head 10 has, following the chisel tip 12, lateral discharge surfaces 11. At these recesses 16 worn rock material flows during the use of tools over.
  • the Ableit vom 11 are coated in the chisel tip 12 facing area with an armor 15, which is designed as a welding job. Thus, the chisel head 10 is protected in this particularly vulnerable area.
  • the chisel head 10 has a collar 13.
  • the collar forms a downwardly directed bearing surface 14.
  • a cylindrical transition portion 21 is connected.
  • a holding portion 22 which is also formed as a cylinder formed.
  • the holding section 22 passes over a chamfer 25 in a shaft extension 20.1.
  • the shaft extension 20.1 is provided with a circumferential groove which serves as a tool holder 26. Following the groove, the shaft extension 20.1 ends with an end portion 29.
  • the end portion 29 forms at the free end of the shaft a plane contact surface, which serves as Abdrückabexcellent 28.
  • the Abdrückabterrorism 28 facing wall of the tool holder 26 forms a Einziehabites 27th
  • the cylindrical clamping sleeve 23 is formed by a rolled sheet metal section.
  • the clamping sleeve 23 has a slot 24 which extends in the longitudinal direction of the clamping sleeve 23 and as may be offset in the present case.
  • the clamping sleeve 23 carries holding elements which protrude in the direction of the drill collar. These retaining elements are not visible in the figure one.
  • the holding elements engage in a circumferential groove of the holding portion 22 a.
  • the clamping sleeve 23 is freely rotatable in the circumferential direction, but kept undamaged in the axial direction of the shank bit.
  • the wear shield 50 has a bore into which the clamping sleeve 23 is set.
  • the inner diameter of the bore is smaller than the outer diameter of the clamping sleeve 23 in its relaxed state.
  • the wear plate 50 is designed as a rotating part.
  • the wear shield 50 has a circumferential wall 52 which defines a cup 53.
  • a projection 51 is formed in the form of a chamfer.
  • the wear protection disk 50 can be moved in the axial direction of the shank bit to the chisel head 10. When it reaches the area of the transition section 21, the wear protection disk 50 releases the clamping sleeve 23 so that it can spring open radially.
  • the shank bit may be mounted in a bit holder 31 of a bit holder 30, which is a bore. This can be done with the aid of a tool.
  • the tool has an actuator 40 which forms a receptacle between a shoulder 42 and a claw 41.
  • the claw 41 engages the tool holder 26 Schaftm administratels, while the shoulder 42 rests against the Ausdrückabêt 28.
  • the actuator 40 of the tool is guided through the receiving bore 31 of the bit holder 30 designed as a through bore.
  • the shoulder 42 and the claw 41 are connected to a bridge portion 44, the bridge portion 44 is designed so that it can be guided between the inner wall of the bit holder 31 and the end portion 29.
  • the end portion 29 with respect to the lateral surface of the holding portion 22 (chisel shaft) and set back relative to the lateral surface of the clamping sleeve 23, since it has a smaller diameter than the holding portion 22 and the clamping sleeve 23.
  • the tool holder 26 is accessible past the end section 29 in the axial direction of the shank bit.
  • the shank bit with the actuator 40 can be pulled through the receiving bore 31 therethrough.
  • the clamping sleeve 23 meets a chamfer 43 of the chisel holder 30, which rotates about the bit holder 31.
  • the clamping sleeve 23 is then compressed radially inward on the receiving bore 31 or the chamfer 43.
  • the wear protection disk 50 then strikes a contact surface 32 of the bit holder 30.
  • the wear protection disk 50 shifts in the direction of the bit head 10 until it reaches the region of the transitional portion 21 and, as described above, releases the clamping sleeve 23.
  • the radially aufspringende clamping sleeve 23 then clamped to the inner wall of the bit holder 31. In this position, the collar 13 comes in the cup 53 of the wear plate 50 to lie.
  • the shank bit When the shank bit has reached its wear limit, it can be removed again from the bit holder 30 with the tool.
  • the actuator 40 is inserted with its claw 41 in the tool holder 26. Since in this state, the shoulder 42 abuts against the Ausdrückabites 28, the Schaftm adoptedel can be pushed out of the receiving bore 31 under the action of the actuator 40. In this case, the frictional force caused by the clamping sleeve 23 between the receiving bore 31 and the outer surface of the clamping sleeve 23 is overcome.
  • the shank bit When the shank bit has reached its disassembled position shown in FIG. 1, it may be lifted off the actuator 40.
  • the shank extension 20.1 is held outside the chisel holder 31.
  • the bit holder 31 is designed as a through hole. The shaft extension 20.1 then protrudes beyond the hole exit facing away from the chisel head 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Knives (AREA)
  • Earth Drilling (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Drilling Tools (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Abstract

A shank chisel including a chisel head and a chisel shank, wherein the chisel shank bears a clamping sleeve in which the chisel shank is held captively in a direction of a longitudinal axis and is freely rotatably about the longitudinal axis. To allow the shank chisel to be both assembled and disassembled through a chisel receptacle of a chisel holder that is formed as a receiving bore, according to this invention, the chisel shank bears at its end remote from the chisel head a shank extension, the shank extension has a tool receptacle, and the tool receptacle is accessible by way of a spacing region of the shank extension in the axial direction of the chisel that is set back from the lateral surface of the chisel shank and/or from the lateral surface of the clamping sleeve.

Description

Schaftmeißel shank bits
Die Erfindung betrifft einen Schaftmeißel mit einem Meißelkopf und einem Meißelschaft, wobei der Meißelschaft eine Spannhülse trägt, in der der Meißelschaft in Richtung seiner Längsachse unverlierbar und um seine Längsachse frei drehbar gehalten ist.The invention relates to a shank bit having a chisel head and a chisel shank, wherein the chisel shank carries a clamping sleeve, in which the chisel shank is held captive in the direction of its longitudinal axis and freely rotatable about its longitudinal axis.
Derartige Schaftmeißel sind in vielfältigen Ausführungsvarianten bekannt. Sie werden üblicherweise in Bergbaumaschinen, Straßenfräsmaschinen, und dergleichen zum Abtragen von Teer, Gestein etc. eingesetzt. Dabei sind die Schaftmeißel in Meißelhaltern befestigt, die auf einer Fräswalze der Maschine gehalten sind. Die Meißelhalter weisen als Meißelaufnahme eine Bohrung auf. In dieser ist der Meißel- schaft mit seiner Spannhülse eingesetzt. Dabei verspannt sich die Spannhülse federelastisch an der Innenwandung der Meißelaufnahme. Der Schaftmeißel ist in der Spannhülse in Richtung seiner Längsachse unverlierbar, jedoch frei drehbar gehalten. Während des Werkzeugeinsatzes wird eine an dem Meißelkopf gehaltene Meißelspitze über das abzutragende Gut geführt und verschleißt dabei zusammen mit dem Meißelkopf. Wenn die Verschleißgrenze erreicht ist, muss der Schaftmeißel ausgetauscht werden. Zur Überwindung der Spannkraft der Spannhülse muss eine Axial- kraft in den Schaftmeißel eingebracht werden. Aus dem Stand der Technik sind verschiedene Werkzeuge bekannt, die zu diesem Zweck eingesetzt werden können. Beispielsweise beschreibt die WO 97/23 710 ein Werkzeug bei dem an einem Handgriff mittels einer Gelenkverbindung ein zapfenförmiger Abdrückabschnitt angekoppelt ist. Das Werkzeug wird zur Demontage eines Schaftmeißels verwendet. Hierzu wird der Abdrückabschnitt durch die rückseitige Öffnung der Meißelaufnahme eingeschoben und mit dem freien Ende des Meißelschaftes zur Anlage gebracht. Der Handgriff kann dann verschwenkt werden, bis er an einem Stützabschnitt zur Anlage kommt. Nun lässt sich der Handgriff gegenüber dem Abdrückabschnitt in der Gelenkverbindung verstellen. Die dabei entstehenden Hebelkräfte werden über den Ab- drückabschnitt derart in den Meißel eingebracht, dass die von der Spannhülse bewirkte Sicherung aufgehoben wird. Wenn der Schaftmeißel demontiert und das Werkzeug entfernt ist, kann ein neuer unverschlissener Schaftmeißel an die Aufnahmebohrung angesetzt und mit einem Hammer eingetrieben werden. Der Wechsel eines Schaftmeißels ist mit der bekannten Anordnung kraftaufwändig und bei beeng- ten Platzverhältnissen nicht gefahrlos durchführbar.Such shank bits are known in many variants. They are commonly used in mining machines, road milling machines, and the like for removing tar, rocks, etc. The shank bits are mounted in chisel holders, which are held on a milling drum of the machine. The bit holders have a bore as a bit holder. In this case, the chisel shaft is inserted with its clamping sleeve. Here, the clamping sleeve resiliently braced against the inner wall of the bit holder. The shank bit is captive in the clamping sleeve in the direction of its longitudinal axis, but kept freely rotatable. During use of the tool, a chisel tip held on the chisel head is passed over the material to be removed and wears together with the chisel head. When the wear limit is reached, the shank bit must be replaced. To overcome the clamping force of the clamping sleeve, an axial force must be introduced into the shank bit. From the prior art, various tools are known that can be used for this purpose. For example, WO 97/23 710 describes a tool in which a pin-shaped Abdrückabschnitt is coupled to a handle by means of a hinge connection. The tool is used to disassemble a shank bit. For this purpose, the Abdrückabschnitt is inserted through the rear opening of the bit holder and brought to the free end of the drill collar to the plant. The handle can then be pivoted until it comes to rest on a support section. Now the handle can be adjusted relative to the Abdrückabschnitt in the joint. The resulting lever forces are introduced into the chisel in such a way via the push-off section that the securing effected by the clamping sleeve is released. When the shank bit is disassembled and the tool removed, a new unspiked shank bit can be attached to the receiving bore and driven in with a hammer. The change of a shank bit with the known arrangement requires considerable effort and can not be carried out safely in confined spaces.
Aus der DE 30 26 930A1 sind weitere Demontagevorrichtungen bekannt. Diese benötigen einen Stößel, der im Bereich der Aufnahmebohrung für den Schaftmeißel montiert ist. Der Stößel lässt sich linear gegen das Schaftende des Schaftmeißels verfahren, so dass dieser aus der Aufnahmebohrung heraus bewegt werden kann.From DE 30 26 930A1 further disassembly devices are known. These require a ram, which is mounted in the region of the receiving bore for the shank bit. The plunger can be moved linearly against the shank end of the shank bit, so that it can be moved out of the receiving bore.
Es ist Aufgabe der Erfindung, einen Schaftmeißel der eingangs erwähnten Art bereitzustellen, der sich durch die Meißelaufnahme hindurch montieren und auch demontieren lässt. Diese Aufgabe wird dadurch gelöst, dass der Meißelschaft an seinem dem Meißelkopf abgewandten Ende eine Schaftverlängerung trägt, dass die Schaftverlängerung eine Werkzeugaufnahme aufweist, und dass die Werkzeugaufnahme über einen gegenüber der Mantelfläche des Meißelschaftes und/oder gegenüber der Mantelfläche der Spannhülse zurückversetzten Abstandsbereich der Schaftverlängerung in Meißelachsrichtung zugänglich ist.It is an object of the invention to provide a shank bit of the type mentioned, which can be mounted through the bit holder and also disassemble. This object is achieved in that the drill collar carries a shaft extension at its end facing away from the bit head, that the shaft extension has a tool holder, and that the tool holder via a relative to the lateral surface of the drill collar and / or against the lateral surface of the clamping sleeve recessed distance range of the shaft extension in Chisel axis direction is accessible.
Mit dieser Konstruktion ist sichergestellt, dass im Abstandsbereich ein Stellglied eines Werkzeugs geführt werden kann. Für die Demontage eines Schaftmeißels wird ein Werkzeugansatz in die Werkzeugaufnahme eingesetzt und ein an den Werkzeugansatz anschließender Abschnitt des Stellgliedes durch den Abstandsbereich geführt. Der Abstandsbereich ermöglicht, dass das Stellglied durch die Aufnahmebohrung hindurch, bei in die Werkzeugaufnahme eingesetztem Werkzeugansatz geführt werden kann. Damit lässt sich der Schaftmeißel mittels des Stellglieds durch die Aufnahmebohrung hindurch sowohl montieren als auch demontieren.This design ensures that an actuator of a tool can be guided in the distance range. For disassembly of a shank bit, a tool attachment is inserted into the tool holder, and a section of the actuator adjoining the tool attachment is guided through the clearance region. The distance range allows the actuator to pass through the receiving bore with tooling inserted into the tool holder. Thus, the shank bit by the actuator through the receiving bore both assemble and disassemble.
Gemäß einer bevorzugten Ausgestaltungsvariante der Erfindung ist es vorgesehen, dass der Abstandsbereich zwischen der Mantelfläche des zylindrischen Meißelschaftes, der einen ersten Durchmesser aufweist und einem Endabschnitt der Schaftver- längerung gebildet ist, der einen zweiten Durchmesser aufweist, wobei der zweite Durchmesser kleiner ist als der erste Durchmesser. Der Abstandsbereich wird im Bereich des Durchmesserversatzes gebildet. Wenn zudem vorgesehen ist, dass die Mittellängsachsen des Meißelschaftes und des Endabschnittes fluchten, und dass der Abstandsbereich von dem zwischen dem ersten und dem zweiten Durchmesser erzeugten Ringraum gebildet ist, dann ist die Werkzeugaufnahme umlaufend zugänglich, was die Anbringung des Werkzeuges an dem Schaftmeißel erleichtert.According to a preferred embodiment variant of the invention, it is provided that the distance region between the lateral surface of the cylindrical drill shank, which has a first diameter and an end portion of the shaft extension is formed, having a second diameter, wherein the second diameter is smaller than the first Diameter. The distance range is formed in the region of the diameter offset. In addition, if it is provided that the central longitudinal axes of the drill collar and the end portion are aligned, and that the distance range is formed by the annular space generated between the first and the second diameter, then the tool holder is circumferentially accessible, which facilitates the attachment of the tool to the Schaftmeißel.
Die Werkzeugaufnahme kann von einer umlaufenden Nut gebildet sein. Damit lässt sich der Schaftmeißel einfach als Drehteil fertigen. Gemäß einer bevorzugten Erfindungsvariante ist es vorgesehen, dass die Schaftverlängerung einen Einziehabschnitt und einen Ausdrückabschnitt aufweist, die quer zur Mittellängsachsen des Schaftmeißels ausgerichtet sind. Auf diese Weise bilden sich quer zur Montage- beziehungsweise Demontage-Richtung hinterschnittene Formflä- chen, die für eine sichere Montage beziehungsweise Demontage einen formschlüssigen Angriff des Werkzeuges erlauben.The tool holder can be formed by a circumferential groove. This makes the shank bit easy to manufacture as a turned part. According to a preferred variant of the invention, it is provided that the shaft extension has a retraction portion and a Ausdrückabschnitt, which are aligned transversely to the central longitudinal axes of the Schaftmeißels. In this way form transverse to the mounting or dismounting direction undercut Formflä- surfaces that allow for a secure assembly or disassembly a positive engagement of the tool.
Damit das Werkzeug auch bei beengten und unübersichtlichen Platzverhältnissen sicher in die Werkzeugaufnahme des Schaftmeißels eingeführt werden kann, kann ein erfindungsgemäßer Schaftmeißel dergestalt sein, dass der Meißelschaft und/oder die Schaftverlängerung über eine Anfasung in die Werkzeugaufnahme übergeleitet sind.Thus, the tool can be safely inserted into the tool holder of the shank bit, even in cramped and confusing spaces, a shank bit according to the invention may be such that the chisel shank and / or the shank extension are transferred via a chamfer in the tool holder.
Zur Erleichterung der Montagearbeit kann es vorgesehen sein, dass auf die Spann- hülse eine Verschleißschutzscheibe aufgezogen ist, die die Spannhülse in einem Vorspannzustand hält, dass die Verschleißschutzscheibe von der Spannhülse in Richtung auf den Meißelkopf abschiebbar ist, und dass die abgeschobenen Verschleißschutzscheibe in einem zwischen dem Meißelkopf und der Spannhülse gebildeten Übergangsabschnitt des Meißelschaftes angeordnet ist und die Spannhülse freigibt. Die mit der Verschleißschutzscheibe vorgespannte Spannhülse kann leicht mit dem erfindungsgemäßen Werkzeug montiert werden.To facilitate the assembly work, it may be provided that a wear protection disc is mounted on the clamping sleeve, which holds the clamping sleeve in a biasing state, that the wear protection disc from the clamping sleeve in the direction of the chisel head is pushed off, and that the deported wear protection disc in a between the chisel head and the clamping sleeve formed transition portion of the drill collar is arranged and the clamping sleeve releases. The prestressed with the wear protection disc clamping sleeve can be easily mounted with the tool according to the invention.
Die Erfindung wird im Folgenden anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:The invention is explained in more detail below with reference to an embodiment shown in the drawing. Show it:
Figur 1 in Seitenansicht und teilweise im Schnitt einen Schaftmeißel, vorbereitet zur Montage in einem Meißelhalter undFigure 1 in side view and partially in section a shank bit, prepared for mounting in a chisel holder and
Figur 2 den Meißelhalter gemäß Figur 1 in perspektivischer Ansicht In der Figur 1 ist ein Schaftmeißel mit einem Meißelkopf 10 und einem Meißelschaft 20 gezeigt. Der Meißelkopf 10 weist eine Aufnahme auf, in die eine Meißelspitze 12 eingesetzt und darin festgelötet ist. Die Meißelspitze 12 besteht üblicherweise aus Hartmetall. Der Meißelkopf 10 weist im Anschluss an die Meißelspitze 12 seitliche Ableitflächen 11 auf. An diesen Ausnehmungen 16 fließt während des Werkzeugeinsatzes abgetragenes Gesteinsmaterial vorbei. Die Ableitflächen 11 sind in dem der Meißelspitze 12 zugewandten Bereich mit einer Panzerung 15, die als Schweißauftrag ausgeführt ist überzogen. Damit ist der Meißelkopf 10 in diesem besonders verschleißgefährdetem Bereich geschützt.Figure 2 shows the bit holder according to Figure 1 in a perspective view In FIG. 1, a shank bit with a chisel head 10 and a chisel shank 20 is shown. The chisel head 10 has a receptacle into which a chisel tip 12 is inserted and soldered therein. The chisel tip 12 is usually made of hard metal. The chisel head 10 has, following the chisel tip 12, lateral discharge surfaces 11. At these recesses 16 worn rock material flows during the use of tools over. The Ableitflächen 11 are coated in the chisel tip 12 facing area with an armor 15, which is designed as a welding job. Thus, the chisel head 10 is protected in this particularly vulnerable area.
Im Übergangsbereich des Meißelkopfs 10 zum Meißelschaft 20 weist der Meißelkopf 10 einen Bund 13 auf. Der Bund bildet eine nach unten gerichtete Auflagefläche 14. An den rotationssymmetrischen Bund 13 ist ein zylindrischer Übergangsabschnitt 21 angeschlossen. An den Übergangsabschnitt 21 ist ein Halteabschnitt 22, der eben- falls als Zylinder ausgebildet ist angeformt. An seinem freien Ende geht der Halteabschnitt 22 über eine Anfasung 25 in eine Schaftverlängerung 20.1 über. Die Schaftverlängerung 20.1 ist mit einer umlaufenden Nut versehen, die als Werkzeugaufnahme 26 dient. Im Anschluss an die Nut schließt die Schaftverlängerung 20.1 mit einem Endabschnitt 29 ab. Der Endabschnitt 29 bildet am freien Schaftende eine Ebene Anlagefläche, die als Abdrückabschnitt 28 dient. Die dem Abdrückabschnitt 28 zugewandte Wandung der Werkzeugaufnahme 26 bildet einen Einziehabschnitt 27.In the transition region of the chisel head 10 to the chisel shaft 20, the chisel head 10 has a collar 13. The collar forms a downwardly directed bearing surface 14. At the rotationally symmetrical collar 13, a cylindrical transition portion 21 is connected. At the transition portion 21 is a holding portion 22 which is also formed as a cylinder formed. At its free end, the holding section 22 passes over a chamfer 25 in a shaft extension 20.1. The shaft extension 20.1 is provided with a circumferential groove which serves as a tool holder 26. Following the groove, the shaft extension 20.1 ends with an end portion 29. The end portion 29 forms at the free end of the shaft a plane contact surface, which serves as Abdrückabschnitt 28. The Abdrückabschnitt 28 facing wall of the tool holder 26 forms a Einziehabschnitt 27th
Auf den Halteabschnitt 22 des Meißelschaftes 20 ist eine Spannhülse 23 aufgescho- ben. Die zylindrische Spannhülse 23 wird von einem gerollten Blechabschnitt gebildet. Die Spannhülse 23 weist einen Schlitz 24 auf, der in Längsrichtung der Spannhülse 23 verläuft und wie vorliegend versetzt verlaufen kann. Die Spannhülse 23 trägt Halteelemente, die in Richtung auf den Meißelschaft vorstehen. Diese Halteelemente sind in der Figur eins nicht erkennbar. Die Halteelemente greifen in eine umlaufende Nut des Halteabschnitts 22 ein. Damit ist die Spannhülse 23 in Umfangsrichtung frei drehbar, jedoch in Achsrichtung des Schaftmeißels unver- lierbar gehalten.On the holding portion 22 of the chisel shaft 20, a clamping sleeve 23 is pushed ben. The cylindrical clamping sleeve 23 is formed by a rolled sheet metal section. The clamping sleeve 23 has a slot 24 which extends in the longitudinal direction of the clamping sleeve 23 and as may be offset in the present case. The clamping sleeve 23 carries holding elements which protrude in the direction of the drill collar. These retaining elements are not visible in the figure one. The holding elements engage in a circumferential groove of the holding portion 22 a. Thus, the clamping sleeve 23 is freely rotatable in the circumferential direction, but kept undamaged in the axial direction of the shank bit.
Auf die Spannhülse 23 ist eine Verschleißschutzscheibe 50 aufgezogen. Die Verschleißschutzscheibe 50 weist eine Bohrung auf in die die Spannhülse 23 eingestellt ist. Der Innendurchmesser der Bohrung ist dabei kleiner als der Außendurchmesser der Spannhülse 23 in ihrem entspannten Zustand. Wenn nun die Verschleißschutzscheibe 50 auf die Spannhülse 23 aufgezogen wird, verkleinert sich der Außendurchmesser der Spannhülse 23, so dass sie in einen Vorspannzustand überführt wird. Wie die Figur zwei erkennen lässt, ist die Verschleißschutzscheibe 50 als Drehteil ausgeführt. Die Verschleißschutzscheibe 50 weist eine umlaufende Wand 52 auf, die einen Napf 53 begrenzt. An der Unterseite der Verschleißschutzscheibe 50 steht ein Ansatz 51 vor, der in Form einer Fase ausgebildet ist. Die Verschleißschutzscheibe 50 kann in Achsrichtung des Schaftmeißels zum Meißelkopf 10 hin verschoben werden. Wenn sie in den Bereich des Übergangsabschnitts 21 gelangt, gibt die Verschleißschutzscheibe 50 die Spannhülse 23 frei, so dass diese radial auf- springen kann.On the clamping sleeve 23 a wear plate 50 is mounted. The wear shield 50 has a bore into which the clamping sleeve 23 is set. The inner diameter of the bore is smaller than the outer diameter of the clamping sleeve 23 in its relaxed state. Now, when the wear plate 50 is mounted on the clamping sleeve 23, the outer diameter of the clamping sleeve 23 decreases, so that it is converted into a biasing state. As the figure reveals two, the wear plate 50 is designed as a rotating part. The wear shield 50 has a circumferential wall 52 which defines a cup 53. At the bottom of the wear plate 50 is a projection 51 which is formed in the form of a chamfer. The wear protection disk 50 can be moved in the axial direction of the shank bit to the chisel head 10. When it reaches the area of the transition section 21, the wear protection disk 50 releases the clamping sleeve 23 so that it can spring open radially.
Der Schaftmeißel kann in einer als Bohrung ausgeführten Meißelaufnahme 31 eines Meißelhalters 30 montiert werden. Dies kann unter Zuhilfenahme eines Werkzeugs erfolgen. Das Werkzeug weist einen Stellglied 40 auf das zwischen einer Schulter 42 und einer Klaue 41 eine Aufnahme bildet. Die Klaue 41 greift in die Werkzeugaufnahme 26 Schaftmeißels ein, während die Schulter 42 sich an den Ausdrückabschnitt 28 anlegt. Das Stellglied 40 des Werkzeugs ist durch die als Durchgangsbohrung ausgeführte Aufnahmebohrung 31 des Meißelhalters 30 geführt. Die Schulter 42 und die Klaue 41 sind mit einem Brückenteil 44 verbunden das Brückenteil 44 ist dabei so ausgeführt, dass es zwischen der Innenwandung der Meißelaufnahme 31 und dem Endabschnitt 29 geführt werden kann. Zu diesem Zwecke ist der Endabschnitt 29 gegenüber der Mantelfläche des Halteabschnitts 22 (Meißel- schaft) und gegenüber der Mantelfläche der Spannhülse 23 zurückversetzt, da er einen geringeren Durchmesser als der Halteabschnitt 22 und die Spannhülse 23 aufweist.The shank bit may be mounted in a bit holder 31 of a bit holder 30, which is a bore. This can be done with the aid of a tool. The tool has an actuator 40 which forms a receptacle between a shoulder 42 and a claw 41. The claw 41 engages the tool holder 26 Schaftmeißels, while the shoulder 42 rests against the Ausdrückabschnitt 28. The actuator 40 of the tool is guided through the receiving bore 31 of the bit holder 30 designed as a through bore. The shoulder 42 and the claw 41 are connected to a bridge portion 44, the bridge portion 44 is designed so that it can be guided between the inner wall of the bit holder 31 and the end portion 29. For this purpose, the end portion 29 with respect to the lateral surface of the holding portion 22 (chisel shaft) and set back relative to the lateral surface of the clamping sleeve 23, since it has a smaller diameter than the holding portion 22 and the clamping sleeve 23.
Durch den so gebildeten zurückversetzten Abstandsbereich ist die Werkzeugauf- nähme 26 in Achsrichtung des Schaftmeißels an dem Endabschnitt 29 vorbei zugänglich. Auf diese Weise lässt sich der Schaftmeißel mit dem Stellglied 40 durch die Aufnahmebohrung 31 hindurch einziehen. Beim Einziehvorgang trifft die Spannhülse 23 auf eine Fase 43 des Meißelhalters 30, die um die Meißelaufnahme 31 umläuft. Beim weiteren Einziehvorgang wird dann die Spannhülse 23 an der Aufnahmeboh- rung 31 beziehungsweise der Fase 43 radial nach innen komprimiert. Dann trifft die Verschleißschutzscheibe 50 auf eine Auflagefläche 32 des Meißelhalters 30. Dabei verschiebt sich die Verschleißschutzscheibe 50 in Richtung auf den Meißelkopf 10, bis sie in den Bereich des Übergangsabschnitts 21 gelangt und, wie oben beschrieben die Spannhülse 23 freigibt. Die radial aufspringende Spannhülse 23 verspannt sich dann an der Innenwandung der Meißelaufnahme 31. In dieser Stellung kommt der Bund 13 in dem Napf 53 der Verschleißschutzscheibe 50 zum Liegen.As a result of the recessed distance region formed in this way, the tool holder 26 is accessible past the end section 29 in the axial direction of the shank bit. In this way, the shank bit with the actuator 40 can be pulled through the receiving bore 31 therethrough. When pulling the clamping sleeve 23 meets a chamfer 43 of the chisel holder 30, which rotates about the bit holder 31. During the further retraction process, the clamping sleeve 23 is then compressed radially inward on the receiving bore 31 or the chamfer 43. The wear protection disk 50 then strikes a contact surface 32 of the bit holder 30. The wear protection disk 50 shifts in the direction of the bit head 10 until it reaches the region of the transitional portion 21 and, as described above, releases the clamping sleeve 23. The radially aufspringende clamping sleeve 23 then clamped to the inner wall of the bit holder 31. In this position, the collar 13 comes in the cup 53 of the wear plate 50 to lie.
Wenn der Schaftmeißel nun seine Verschleißgrenze erreicht hat, kann er mit dem Werkzeug wieder aus dem Meißelhalter 30 demontiert werden. Hierzu wird das Stellglied 40 mit seiner Klaue 41 in die Werkzeugaufnahme 26 eingesetzt. Da in diesem Zustand die Schulter 42 an dem Ausdrückabschnitt 28 anliegt, kann der Schaftmeißel unter Krafteinwirkung des Stellglieds 40 aus der Aufnahmebohrung 31 aufgeschoben werden. Dabei wird die von der Spannhülse 23 bewirkte Reibkraft zwischen der Aufnahmebohrung 31 und der Außenfläche der Spannhülse 23 überwunden. Wenn der Schaftmeißel dann seine in Figur eins gezeigte demontierte Stellung erreicht hat, kann er von dem Stellglied 40 abgehoben werden.When the shank bit has reached its wear limit, it can be removed again from the bit holder 30 with the tool. For this purpose, the actuator 40 is inserted with its claw 41 in the tool holder 26. Since in this state, the shoulder 42 abuts against the Ausdrückabschnitt 28, the Schaftmeißel can be pushed out of the receiving bore 31 under the action of the actuator 40. In this case, the frictional force caused by the clamping sleeve 23 between the receiving bore 31 and the outer surface of the clamping sleeve 23 is overcome. When the shank bit has reached its disassembled position shown in FIG. 1, it may be lifted off the actuator 40.
Um für ein beabsichtigtes Demontieren des Schaftmeißels ein einfaches Einsetzen des Stellglieds 40 in die Werkzeugaufnahme 26 zu ermöglichen, ist es vorteilhaft, wenn die Schaftverlängerung 20.1 außerhalb der Meißelaufnahme 31 gehalten ist. Hierzu ist die Meißelaufnahme 31 als Durchgangsbohrung ausgeführt. Die Schaftver- längerung 20.1 ragt dann über den, dem Meißelkopf 10 abgewandten Bohrungsaustritt vor.In order to enable a simple insertion of the actuator 40 in the tool holder 26 for an intended dismantling of the shank bit, it is advantageous if the shank extension 20.1 is held outside the chisel holder 31. For this purpose, the bit holder 31 is designed as a through hole. The shaft extension 20.1 then protrudes beyond the hole exit facing away from the chisel head 10.
Denkbar ist es jedoch auch, dass die Schaftverlängerung 20.1 innerhalb der Meißelaufnahme 31 gehalten ist. Dann muss darauf geachtet werden, dass die Klaue 41 zum Einsetzen in die Werkzeugaufnahme 26 durch den Abstandsbereich zwischen dem Endabschnitt 29 und der Wandung der Meißelaufnahme 31 vorbeigeführt werden kann. However, it is also conceivable that the shaft extension 20.1 is held within the bit receptacle 31. Then, care must be taken that the claw 41 for insertion into the tool holder 26 can be guided past the distance region between the end section 29 and the wall of the bit holder 31.

Claims

A n s p r ü c h e Claims
1. Schaftmeißel mit einem Meißelkopf (10) und einem Meißelschaft (20), wobei der Meißelschaft (20) eine Spannhülse (23) trägt, in der der Meißelschaft (20) in Richtung seiner Längsachse unverlierbar und um seine Längsachse frei drehbar gehalten ist, dadurch gekennzeichnet, dass der Meißelschaft (20) an seinem dem Meißelkopf (10) abgewandten Ende eine Schaftverlängerung (20.1)trägt, dass die Schaftverlängerung (20.1) eine Werkzeugaufnahme (26) aufweist, und dass die Werkzeugaufnahme (26) über einen gegenüber der Mantelfläche des Meißelschaftes (20) und/oder gegenüber der Mantelfläche der Spannhül- se (23) zurückversetzten Abstandsbereich der Schaftverlängerung (20.1) in1. shank bit with a chisel head (10) and a chisel shank (20), wherein the chisel shank (20) carries a clamping sleeve (23) in which the chisel shank (20) is held captive in the direction of its longitudinal axis and freely rotatable about its longitudinal axis, characterized in that the bit shank (20) at its end remote from the bit head (10) carries a shaft extension (20.1), that the shaft extension (20.1) has a tool holder (26), and that the tool holder (26) via a relative to the lateral surface the chisel shank (20) and / or with respect to the lateral surface of the clamping sleeve (23) recessed distance range of the shank extension (20.1) in
Meißelachsrichtung zugänglich ist. Chisel axis direction is accessible.
2. Schaftmeißel nach Anspruch 2, dadurch gekennzeichnet, dass der Abstandsbereich zwischen der Mantelfläche des zylindrischen Mei- ßelschaftes (20), der einen ersten Durchmesser (D1) aufweist und einem Endabschnitt (29) der Schaftverlängerung (20.1) gebildet ist, der einen zweiten Durchmesser (d1) aufweist, wobei der zweite Durchmesser (d1) kleiner ist als der erste Durchmesser (D1).2. shank bit according to claim 2, characterized in that the distance region between the lateral surface of the cylindrical Mei ßelschaftes (20), which has a first diameter (D1) and an end portion (29) of the shaft extension (20.1) is formed, a second Diameter (d1), wherein the second diameter (d1) is smaller than the first diameter (D1).
3. Schaftmeißel nach Anspruch 2, dadurch gekennzeichnet, dass die Mittellängsachsen des Meißelschaftes (20) und des Endabschnittes3. shank bit according to claim 2, characterized in that the central longitudinal axes of the drill shank (20) and the end portion
(29) fluchten und dass der Abstandsbereich von dem zwischen dem ersten und zweiten Durch- messer (D1 und d1) gebildeten Ringraum gebildet ist.(29) are aligned and that the distance range is formed by the annular space formed between the first and second diameters (D1 and d1).
4. Schaftmeißel nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Werkzeugaufnahme (26) von einer umlaufenden Nut gebildet ist.4. shank bit according to one of claims 1 to 3, characterized in that the tool holder (26) is formed by a circumferential groove.
5. Schaftmeißel nach einem der Ansprüche 1 bist 4, dadurch gekennzeichnet, dass die Schaftverlängerung (20.1) einen Einziehabschnitt (27) und einen Ausdrückabschnitt (28) aufweist, die quer zur Mittellängsachse des Schaft- meißeis ausgerichtet sind. 5. shank bit according to one of claims 1 to 4, characterized in that the shank extension (20.1) has a Einziehabschnitt (27) and a Ausdrückabschnitt (28), which are aligned transversely to the central longitudinal axis of the shank Meisße.
6. Schaftmeißel nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Meißelschaft (20) und/oder die Schaftverlängerung (20.1) über eine Anfasung (25) in die Werkzeugaufnahme (25) übergeleitet sind.6. shank bit according to one of claims 1 to 5, characterized in that the chisel shank (20) and / or the shank extension (20.1) via a chamfer (25) in the tool holder (25) are merged.
7. Schaftmeißel nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass auf die Spannhülse (23) eine Verschleißschutzscheibe (50) aufgezogen ist, die die Spannhülse (23) in einem Vorspannzustand hält, dass die Verschleißschutzscheibe (50) von der Spannhülse (23) in Richtung auf den Meißelkopf (10) abschiebbar ist, dass die abgeschobene Verschleißschutzscheibe (50) in einem zwischen dem7. shank bit according to one of claims 1 to 6, characterized in that on the clamping sleeve (23) a wear protection disc (50) is mounted, which holds the clamping sleeve (23) in a biasing state that the wear protection disc (50) of the clamping sleeve ( 23) in the direction of the chisel head (10) can be pushed off, that the deported wear protection disc (50) in a between the
Meißelkopf (10) und der Spannhülse (23) gebildeten Übergangsabschnitt (21) des Meißelschaftes (20) angeordnet ist und die Spannhülse (23) freigibt. Chisel head (10) and the clamping sleeve (23) formed transition portion (21) of the drill shank (20) is arranged and the clamping sleeve (23) releases.
EP08773352A 2007-07-02 2008-05-30 Shank chisel Active EP2160274B1 (en)

Applications Claiming Priority (2)

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DE102007030658A DE102007030658A1 (en) 2007-07-02 2007-07-02 shank bits
PCT/EP2008/004303 WO2009003561A1 (en) 2007-07-02 2008-05-30 Shank chisel

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EP2160274A1 true EP2160274A1 (en) 2010-03-10
EP2160274B1 EP2160274B1 (en) 2011-12-21

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US (1) US8550569B2 (en)
EP (1) EP2160274B1 (en)
JP (1) JP5496088B2 (en)
CN (1) CN101687341B (en)
AT (1) ATE537951T1 (en)
AU (1) AU2008271684B2 (en)
DE (1) DE102007030658A1 (en)
ES (1) ES2379849T3 (en)
RU (1) RU2434999C2 (en)
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Publication number Publication date
WO2009003561A1 (en) 2009-01-08
RU2010103271A (en) 2011-08-10
US20100194177A1 (en) 2010-08-05
TWI577880B (en) 2017-04-11
EP2160274B1 (en) 2011-12-21
TWI413728B (en) 2013-11-01
CN101687341B (en) 2013-06-19
AU2008271684A1 (en) 2009-01-08
ES2379849T3 (en) 2012-05-04
TW201402933A (en) 2014-01-16
TW200909665A (en) 2009-03-01
ATE537951T1 (en) 2012-01-15
AU2008271684A2 (en) 2010-01-28
JP5496088B2 (en) 2014-05-21
JP2010531740A (en) 2010-09-30
CN101687341A (en) 2010-03-31
US8550569B2 (en) 2013-10-08
RU2434999C2 (en) 2011-11-27
DE102007030658A1 (en) 2009-01-15
AU2008271684B2 (en) 2012-02-23
ZA200909031B (en) 2010-09-29

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