EP0275890A1 - Round shank pick - Google Patents

Round shank pick Download PDF

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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
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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
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German (de)
French (fr)
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EP0275890B1 (en
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
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Publication of EP0275890A1 publication Critical patent/EP0275890A1/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C35/00Details 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
    • E21C35/18Mining picks; Holders therefor
    • E21C35/19Means for fixing picks or holders
    • E21C35/197Means 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.

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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)
  • Percussive Tools And Related Accessories (AREA)
  • Gripping On Spindles (AREA)

Abstract

Rundschaftmeißel (10) mit Meißelkopf (11) und Meißelschaft (14), bei dem der Meißelschaft (14) eine Umfangsnut (15) mit einer darin gelagerten, längsgeschlitzten Spannhülse (17) aufweist und bei dem der Meißelschaft (14) mit der unter Spannung gesetzten Spannhülse (17) in einer Bohrung (21) eines Meißelhalters (20) axial festlegbar ist, während der Meißelschaft (14) in der Spannhülse (17) frei drehbar bleibt. Das Einsetzen des Rundschaftmeißels (10) in die Bohrung (21) eines Meißelhalters (20) wird dadurch erleichtert, daß die Spannhülse (17) mittels eines Haltegliedes (19) in einer Spannstellung gehalten ist, in der der Außendurchmesser der Spannhülse (17) gleich oder kleiner ist als der Durchmesser der Bohrung (21) des Meißelhalters (20) und daß beim Einsetzen des Meißelschaftes (14) mit der Spannhülse (17) in die Bohrung (21) des Meißelhalters (20) das Halteglied (19) in einen außerhalb der Spannhülse (17) liegenden Bereich des Meißelschaftes (14) verstellbar ist.

Figure imgaf001
Round shank chisel (10) with a chisel head (11) and chisel shank (14), in which the chisel shank (14) has a circumferential groove (15) with a longitudinally slotted clamping sleeve (17) and in which the chisel shank (14) with the under tension set clamping sleeve (17) in a bore (21) of a chisel holder (20) can be axially fixed, while the chisel shank (14) remains freely rotatable in the clamping sleeve (17). The insertion of the round shank chisel (10) into the bore (21) of a chisel holder (20) is facilitated in that the clamping sleeve (17) is held in a clamping position by means of a holding member (19) in which the outer diameter of the clamping sleeve (17) is the same or is smaller than the diameter of the bore (21) of the chisel holder (20) and that when inserting the chisel shaft (14) with the clamping sleeve (17) into the bore (21) of the chisel holder (20), the holding member (19) into an outside the clamping sleeve (17) lying area of the chisel shaft (14) is adjustable.
Figure imgaf001

Description

Die Erfindung betrifft einen Rundschaftmeißel mit Meißelkopf und Meißelschaft, bei dem der Meißelschaft eine Umfangsnut mit einer darin gelagerten, längsgeschlitzten Spannhülse aufweist und bei dem der Meißelschaft mit der unter Spannung gesetzten Spannhülse in einer Bohrung eines Meißelhalters axial festlegbar ist, während der Meißelschaft in der Spannhülse frei drehbar bleibt.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.

Ein derartiger Rundschaftmeißel ist aus der US-PS 14 75 136 bekannt. Dabei erstreckt sich die Spannhülse über den wesentlichsten Teil der axialen Abmessung des Meißelschaftes, um eine möglichst große Abstütz- und Spannfläche für die Spannhülse in der Bohrung des Meißelhalters zu bekommen. Derartig lange Spannhülsen bringen zudem den Vorteil, daß eine ausreichend große Haltekraft zwischen der Spannhülse und der Bohrung des Meißelhalters erzeugt wird. Da der Haltebund am freien Ende des Meißelschaftes schmal ist und die Spannhülse beim Einsetzen des Meißelschaftes mit der Spannhülse in die Bohrung des Meißelhalters mit großer Kraft zusammengedrückt werden muß, treten beim Einsetzen des Rundschaftmeißels dieser Art in eine Bohrung eines Meißelhalters erhebliche Schwierigkeiten auf. Vielfach sind dazu spezielle Einsetzeinrichtungen vorgesehen.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. Since the retaining collar is narrow at the free end of the chisel shaft and the clamping sleeve must be pressed with great force when inserting the chisel shaft with the clamping sleeve into the bore of the chisel holder, considerable difficulties arise when inserting the round shank chisel of this type into a bore of a chisel holder. Special insertion devices are often provided for this purpose.

Es ist Aufgabe der Erfindung, einen Rundschaftmeißel der eingangs erwähnten Art zu schaffen, bei dem trotz langer Spannhülse mit sehr großen Spannkräften das Einsetzen in eine Bohrung eines Meißelhalters wesentlich erleichtert ist.It is an object of the invention to provide a round shank chisel of the type mentioned in which, despite the long clamping sleeve with very large clamping forces, the insertion into a bore of a chisel holder is made considerably easier.

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß die Spannhülse mittels eines Haltegliedes in einer Spannstellung gehalten ist, in der der Außendurchmesser der Spannhülse gleich oder kleiner ist als der Durchmesser der Bohrung des Meißelhalters und daß beim Einsetzen des Meißelschaftes mit der Spannhülse in die Bohrung des Meißelhalters das Halteglied in einen außerhalb der Spannhülse liegenden Bereich des Meißelschaftes verstellbar ist.This object is achieved according to the invention in that 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.

Bei dem mit dem Halteglied versehenen Rundschaftmeißel ist die Spannhülse so weit vorgespannt, daß der Meißelschaft mit der Spannhülse auch manuell über einen großen Teil der axialen Abmessung in die Bohrung des Meißelhalters eingeschoben werden kann, bis z.B. das Halteglied an der Einführungsseite des Meißelhalters anliegt. Mit einem Hammerschlag kann dann der Rundschaftmeißel bis zum Anschlag des Meißelkopfes am Meißelhalter eingeschlagen werden. Dabei wird das Halteglied von der Spannhülse heruntergeschoben und gelangt in einen von der Spannhülse freien Bereich des Meißelschaftes, so daß sich die Spannhülse mit der ihr eigenen Spannkraft in der Bohrung des Meißelhalters verspannen kann, wobei die Spannkraft mit zunehmender Eintreibtiefe entsprechend zunimmt.In the round shank chisel provided with the holding member, 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.

Eine besonders einfache Ausgestaltung ist dadurch gekennzeichnet, daß das Haltegllied als Haltering oder Haltescheibe ausgebildet ist, der bzw. die die Spannhülse umschließt und daß der Innendurchmesser des Halteringes oder der Haltescheibe gleich oder kleiner ist als der Durchmesser der Bohrung des Meißelhalters. Ein derartiges Halteglied ist ein einfaches, leicht und billig herstellbares Teil.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.

Damit die axiale Abmessung des Meißelschaftes optimal für die Spannhülse ausgenützt werden kann, sieht eine weitere Ausgestaltung vor, daß sich die Umfangsnut des Meißelschaftes bis auf einen Abstand an den Meißelkopf heranreicht, der gleich oder größer ist als der Durchmesser des für den Haltering verwendeten Rundmaterials oder die Dicke der Haltescheibe.In order that the axial dimension of the chisel shaft can be optimally used for the clamping sleeve, 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.

Der Meißelkopf des Rundschaftmeißels kann sich an der zugekehrten Stirnseite des Meißelhalters abstützen, wenn die Ausgestaltung so ausgeführt ist, daß die Bohrung des Meißelhalters auf der Einführseite eine Erweiterung aufweist, die bei in die Bohrung eingesetztem Meißelschaft mit Spannhülse das als Haltering ausgebildete Halteglied aufnimmt.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.

Das Halteglied des Rundschaftmeißels kann dadurch als Schutzscheibe für die Stirnseite des Meißelhalters ausgenützt werden, daß das als Haltescheibe ausgebildete Halteglied bei in die Bohrung des Meißelhalters eingesetztem Meißelschaft mit Spannhülse zwischen dem Meißelkopf und der die Bohrung umschließenden Wand auf der Einführseite des Meißelhalters angeordnet ist.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.

Ist dabei vorgesehen, daß die Haltescheibe aus verschlußfestem Material besteht und einen Außendurchmesser aufweist, der gleich oder größer ist als der maximale Außendurchmesser des Meißelkopfes, dann dient die Haltescheibe in dem über den Meißelkopf hinausragenden Bereich als Verschleißschutz für den Meißelhalter.If it is provided that 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.

Nach einer bevorzugten Ausgestaltung ist vorgesehen, daß der Meißelkopf dem Meißelschaft zugekehrt in einen Bund ausläuft, daß in die dem Meißelschaft abgekehrte Meißelspitze ein Hartmetalleinsatz eingesetzt ist und daß sich die Spannhülse im wesentlichen über die gesamte axiale Länge des Meißelschaftes erstreckt.According to a preferred embodiment, it is provided that 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.

Die Erfindung wird anhand von in der Zeichnung dargestellten Ausführungsbeispielen näher erläutert. Es zeigt:

  • Fig. 1 einen Rundschaftmeißel mit einem als Haltescheibe ausgebildeten Halteglied in der Einführstellung, bei der der Meißelschaft mit der Spannhülse ohne Verspannung in die Bohrung eines Meißelhalters eingesteckt ist, und
  • Fig. 2 einen Rundschaftmeißel mit einem als Haltering ausgebildeten Halteglied in der Arbeitsstellung mit der in der Bohrung des Meißelhalters verspannten Spannhülse und in der Spannhülse frei drehbaren Meißelschaft.
The invention is explained in more detail with reference to exemplary embodiments shown in the drawing. It shows:
  • Fig. 1 shows a round shank chisel with a holding member designed as a holding disc in the insertion position, in which the chisel shank with the clamping sleeve is inserted into the bore of a chisel holder without bracing, and
  • Fig. 2 shows a round shank chisel with a holding member designed as a retaining ring in the working position with the clamping sleeve clamped in the bore of the chisel holder and freely rotatable chisel shaft in the clamping sleeve.

Bei dem Ausführungsbeispiel nach Fig. 1 schließt sich bei dem Rundschaftmeißel 10 an den Meißelkopf 11 der Meißelschaft 14 an. Der Übergang des Meißelkopfes ist dabei als Bund 13 ausgebildet, der den größten Außendurchmesser des Meißelkopfes 11 bildet. In die Meißelspitze ist in bekannter Weise der Hartmetalleinsatz 12 eingesetzt. Auf dem Meißelschaft 14 sitzt in der Umfangsnut 15 die mit dem Längsschlitz 8 versehene Spannhülse 17. Die Spannhülse 17 erstreckt sich über den wesentlichsten Teil der axialen Abmessung des Meißelschaftes 14, so daß der Bund 16 am freien Ende des Meißelschaftes 14 und der von der Spannhülse 17 freie Bereich bis zum Meißelkopf 11 sehr schmal sind. Auf die Spannhülse 17 ist als Halteglied 19 eine Haltescheibe aufgeschoben, die die Spannhülse 17 so weit verspannt, daß ihr Außendurchmesser gleich oder kleiner ist als der Durchmesser der Bohrung 21 in dem Meißelhalter 20. Der Längsschlitz 18 ist so breit, daß die Spannhülse 17 so weit zusammengedrückt werden kann, daß ihre Innenwandung auf dem Nutgrund der Umfangsnut 15 im Meißelschaft 14 anliegt. Da die Bohrung 21 des Meißelhalters 20 mit einer Einführungserweiterung 23 versehen ist, kann der Rundschaftmeißel 10 leicht in die Bohrung 21 des Meißelschaftes 14 eingesteckt werden. Dieser Einsteckvorgang kann manuell ausgeführt werden, bis das Halteglied 19 an der Stirnseite des Meißelhalters 20 anschlägt. Mit erhöhter Kraftaufwendung, z.B. mit einem Hammerschlag, kann der Rundschaftmeißel 10 so weit in die Bohrung 21 eingeschlagen werden, bis der Bund 13 des Meißelkopfes 11 sich über das Halteglied 19 an der Stirnseite des Meißelhalters 20 abstützt. Dabei wird das als Haltescheibe ausgebildete Halteglied 19 von der Spannhülse 17 herunter bis in den freien Bereich des Meißelschaftes 14 zwischen der Spannhülse 17 und dem Meißelkopf 11 geschoben, so daß es die Spannhülse 17 freigibt. Die Spannhülse 17 kann sich nun mit der ihr eigenen Spannkraft in der Bohrung 21 des Meißelhalters 20 verspannen, da sie im entspannten Zustand einen Außendurchmesser annehmen würde, der größer ist als der Durchmesser der Bohrung 21 des Meißelhalters 20. Die Differenz dieser beiden Durchmesserwerte bestimmt die Spannkraft der Spannhülse 17 und damit die Kraft, mit der der Rundschaftmeißel 10 in der Bohrung 21 des Meißelhalters 20 gehalten ist.In the exemplary embodiment according to FIG. 1, 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. On the clamping sleeve 17, 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. Since the bore 21 of the chisel holder 20 is provided with an insertion extension 23, 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. In this case, 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.

Bei dem Ausführungsbeispiel nach Fig. 1 entspricht der Außendurchmesser der Haltescheibe dem maximalen Außendurchmesser des Meißelkopfes 11 im Bereich des Bundes 13. Die Haltescheibe dient dabei als Schutzscheibe für den Meißelhalter 20, da sie die auf den Rundschaftmeißel 10 einwirkenden Stoßkräfte abfedert. Wird der Außendurchmesser der Haltescheibe über den maximalen Außendurchmesser des Meißelkopfes 11 hinaus vergrößert, dann läßt sich die gesamte Stirnseite des Meißelhalters 20 gegen Verschleiß schützen, wenn die Haltescheibe aus verschleißfestem Material besteht.In the embodiment according to FIG. 1, 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.

Das Ausführungsbeispiel nach Fig. 2 unterscheidet sich nur in der Ausgestaltung des Haltegliedes 19 vom Ausführungsbeispiel nach Fig. 1. Die Fig. 2 zeigt den Rundschaftmeißel 10 in der Arbeitsstellung. Dabei liegt der Bund 13 des Meißelkopfes 11 an der Stirnseite des Meißelhalters 20 an. Das Halteglied 19 ist als Haltering aus einem Rundmaterial ausgebildet. Die Bohrung 21 des Meißelhalters 20 weist in der dem Meißelkopf 11 zugekehrten Stirnseite die Erweiterung 23 auf, die den von der Spannhülse 17 heruntergeschobenen Haltering aufnimmt. Der von der Spannhülse 17 freie Bereich des Meißelschaftes 14 zwischen der Spannhülse 17 und dem Meißelkopf 11 muß daher mindestens eine Breite aufweisen, die dem Durchmesser des für den Haltering verwendeten Rundmaterials entspricht. Die Auslegung der Spannhülse 17 und des Halteringes in den Durchmessern erfolgt sinngemäß wie beim Ausführungsbeispiel nach Fig. 1, so daß die mit dem Haltering vorgespannte Spannhülse 17 leicht manuell in die Bohrung 21 des Meißelhalters 20 eingesteckt werden kann und daß bei vom Haltering freigegebener Spannhülse 17 eine ausreichend große Spannkraft zwischen der Spannhülse 17 und der Bohrung 21 des Meißelhalters 20 erreicht wird. Der Meißelschaft 14 bleibt dagegen in der Spannhülse 17 frei drehbar, da in der Spannstellung der Innendurchmesser er Spannhülse 17 größer ist als der Durchmesser des Meißelschaftes 14 im Bereich der Umfangsnut 15.The embodiment according to FIG. 2 differs only in the design of the holding member 19 from the embodiment according to FIG. 1. 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.

Claims (7)

1. Rundschaftmeißel mit Meißelkopf und Meißelschaft, bei dem der Meißelschaft eine Umfangsnut mit einer darin gelagerten, längsgeschlitzten Spannhülse aufweist und bei dem der Meißelschaft mit der unter Spannung gesetzten Spannhülse in einer Bohrung eines Meißelhalters axial festlegbar ist, während der Meißelschaft in der Spannhülse frei drehbar bleibt,
dadurch gekennzeichnet,
daß die Spannhülse (17) mittels eines Haltegliedes (19) in einer Spannstellung gehalten ist, in der der Außendurchmesser der Spannhülse (17) gleich oder kleiner ist als der Durchmesser der Bohrung (21) des Meißelhalters (20) und
daß beim Einsetzen des Meißelschaftes (14) mit der Spannhülse (17) in die Bohrung (21) des Meißelhalters (20) das Halteglied (19) in einen außerhalb der Spannhülse (17) liegenden Bereich des Meißelschaftes (14) verstellbar ist.
1. 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 and in which the chisel shaft can be axially fixed with the tensioned sleeve in a bore of a chisel holder, while the chisel shaft is freely rotatable in the clamping sleeve remains,
characterized,
that the clamping sleeve (17) is held by means of a holding member (19) in a clamping position in which the outer diameter of the clamping sleeve (17) is equal to or smaller than the diameter of the bore (21) of the bit holder (20) and
that when inserting the chisel shank (14) with the clamping sleeve (17) into the bore (21) of the chisel holder (20), the holding member (19) is adjustable into an area of the chisel shaft (14) lying outside the clamping sleeve (17).
2. Rundschaftmeißel nach Anspruch 1,
dadurch gekennzeichnet,
daß das Haltegllied (19) als Haltering oder Haltescheibe ausgebildet ist, der bzw. die die Spannhülse (17) umschließt und
daß der Innendurchmesser des Halteringes oder der Haltescheibe gleich oder kleiner ist als der Durchmesser der Bohrung (21) des Meißelhalters (20).
2. picks according to claim 1,
characterized,
that the holding member (19) is designed as a retaining ring or washer, which or which surrounds the clamping sleeve (17) and
that the inner diameter of the retaining ring or the holding disc is equal to or smaller than the diameter of the bore (21) of the bit holder (20).
3. Rundschaftmeißel nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß sich die Umfangsnut (15) des Meißelschaftes (14) bis auf einen Abstand an den Meißelkopf (11) heranreicht, der gleich oder größer ist als der Durchmesser des für den Haltering verwendeten Rundmaterials oder die Dicke der Haltescheibe.
3. picks according to claim 1 or 2,
characterized,
that the circumferential groove (15) of the chisel shank (14) reaches up to a distance from the chisel head (11) which is equal to or greater than the diameter of the round material used for the retaining ring or the thickness of the retaining disk.
4. Rundschaftmeißel nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß die Bohrung (21) des Meißelhalters (20) auf der Einführseite eine Erweiterung (23) aufweist, die bei in die Bohrung (21) eingesetztem Meißelschaft (14) mit Spannhülse (17) das als Haltering ausgebildete Halteglied (19) aufnimmt.
4. picks according to one of claims 1 to 3,
characterized,
that the bore (21) of the chisel holder (20) has an extension (23) on the insertion side which, when the chisel shaft (14) with the clamping sleeve (17) is inserted into the bore (21), holds the retaining member (19) designed as a retaining ring.
5. Rundschaftmeißel nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß das als Haltescheibe ausgebildete Halteglied (19) bei in die Bohrung (21) des Meißelhalters (20) eingesetztem Meißelschaft (14) mit Spannhülse (17) zwischen dem Meißelkopf (11) und der die Bohrung umschließenden Wand auf der Einführseite des Meißelhalters (20) angeordnet ist.
5. picks according to one of claims 1 to 3,
characterized,
that the holding member (19) designed as a holding disc when the bit shaft (14) is inserted into the bore (21) of the bit holder (20) with an adapter sleeve (17) between the bit head (11) and the wall surrounding the hole on the insertion side of the bit holder (20 ) is arranged.
6. Rundschaftmeißel nach Anspruch 5,
dadurch gekennzeichnet,
daß die Haltescheibe aus verschlußfestem Material besteht und einen Außendurchmesser aufweist, der gleich oder größer ist als der maximale Außendurchmesser des Meißelkopfes (11).
6. picks according to claim 5,
characterized,
that the retaining washer is made of fastener-resistant material and has an outer diameter which is equal to or larger than the maximum outer diameter of the chisel head (11).
7. Rundschaftmeißel nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
daß der Meißelkopf (11) dem Meißelschaft (14) zugekehrt in einen Bund (13) ausläuft,
daß in die dem Meißelschaft (14) abgekehrte Meißelspitze ein Hartmetalleinsatz (12) eingesetzt ist und
daß sich die Spannhülse (17) im wesentlichen über die gesamte axiale Länge des Meißelschaftes (14) erstreckt.
7. picks according to one of claims 1 to 6,
characterized,
that the chisel head (11), facing the chisel shaft (14), ends in a collar (13),
that a hard metal insert (12) is inserted into the chisel tip facing away from the chisel shaft (14) and
that the clamping sleeve (17) extends substantially over the entire axial length of the chisel shaft (14).
EP88100268A 1987-01-23 1988-01-12 Round shank pick Expired - Lifetime EP0275890B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3701905A DE3701905C1 (en) 1987-01-23 1987-01-23 Attachment of a round shank chisel
DE3701905 1987-01-23

Publications (2)

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

Family

ID=6319370

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88100268A Expired - Lifetime EP0275890B1 (en) 1987-01-23 1988-01-12 Round shank pick

Country Status (8)

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

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Also Published As

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

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