EP0275890B1 - Round shank pick - Google Patents

Round shank pick Download PDF

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Publication number
EP0275890B1
EP0275890B1 EP88100268A EP88100268A EP0275890B1 EP 0275890 B1 EP0275890 B1 EP 0275890B1 EP 88100268 A EP88100268 A EP 88100268A EP 88100268 A EP88100268 A EP 88100268A EP 0275890 B1 EP0275890 B1 EP 0275890B1
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EP
European Patent Office
Prior art keywords
bit
chisel
clamping sleeve
bore
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.)
Expired - Lifetime
Application number
EP88100268A
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German (de)
French (fr)
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EP0275890A1 (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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Publication of EP0275890B1 publication Critical patent/EP0275890B1/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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 fastening of a round shank chisel in a bore of a chisel holder, the round shank chisel consisting of a chisel head and a chisel shank, the chisel shank having a circumferential groove with a longitudinally slotted clamping sleeve which is inserted into the bore of the holder by means of a holding member before the chisel shaft is inserted is held in a clamping position, and the chisel shaft is axially fixed after insertion into the bore of the holder with the tensioning sleeve seated in the bore under tension, but is freely rotatable.
  • Such a round shank chisel is known from US-A 1 475 136.
  • the clamping sleeve extends over the most important part of the axial dimension of the chisel shank 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.
  • This clamping sleeve also has an annular disk which is arranged coaxially from a material which is softer than that of the cutting bit head, the inside diameter of which is not smaller than the outside diameter of the clamping sleeve in the expanded installation state and which serves to protect the end face of the holding body facing the head of the cutting bit from damage.
  • a round shank chisel which has an adapter sleeve and a ring surrounding the chisel shank.
  • the ring is made of wear-resistant material and serves only as wear protection for the chisel shaft and the collar of the hole in the chisel holder.
  • the outer diameter of the clamping sleeve is equal to or smaller than the diameter of the bore and that when the chisel shank is inserted with the clamping sleeve into the bore, the holding member in a region not covered by the clamping sleeve the chisel shaft is movable.
  • 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 picks can then be hammered in with a hammer blow until the chisel head stops on the chisel holder.
  • the holding member is pushed down from 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 holding ring or holding disk which surrounds the clamping sleeve and that the inside diameter of the holding ring or holding disk 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 extends to a distance from the chisel head that is equal to or larger than the diameter of the round material used for the retaining ring or the thickness of the washer.
  • 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 facing the chisel shaft ends in a collar, 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 essential 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 can be widely compressed 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 effort, e.g. 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 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 disc corresponds to the maximum outer diameter of the chisel head 11 in the region of the collar 13.
  • the holding disc serves as a protective disc 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 differs only in the design of the holding member 19 from the embodiment of FIG. 1.
  • FIG. 2 shows the round shank 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 in the front side facing the chisel head 11 the extension 23 which receives the retaining ring pushed down by the clamping sleeve 17.
  • the area of the chisel shaft 14 that is free of the clamping sleeve 17 between the clamping sleeve 17 and the chisel head 11 must therefore have at least a width that 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.

Description

Die Erfindung betrifft eine Befestigung eines Rundschaftmeißels in einer Bohrung eines Meißelhalters, wobei der Rundschaftmeißel aus Meißelkopf und Meißelschaft besteht, wobei der Meißelschaft eine Umfangsnut mit einer darin gelagerten, längsgeschlitzten Spannhülse aufweist, die vor dem Einsetzen des Meißelschaftes in die Bohrung des Halters mittels eines Haltegliedes in einer Spannstellung gehalten ist, und wobei der Meißelschaft nach dem Einsetzen in die Bohrung des Halters mit der unter Spannung in der Bohrung sitzenden Spannhülse axial festgelegt, aber frei drehbar ist.The invention relates to a fastening of a round shank chisel in a bore of a chisel holder, the round shank chisel consisting of a chisel head and a chisel shank, the chisel shank having a circumferential groove with a longitudinally slotted clamping sleeve which is inserted into the bore of the holder by means of a holding member before the chisel shaft is inserted is held in a clamping position, and the chisel shaft is axially fixed after insertion into the bore of the holder with the tensioning sleeve seated in the bore under tension, but is freely rotatable.

Ein derartiger Rundschaftmeißel ist aus der US-A 1 475 136 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 Meißeischaftes 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 shank chisel is known from US-A 1 475 136. The clamping sleeve extends over the most important part of the axial dimension of the chisel shank 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 shank and the clamping sleeve must be compressed with great force when inserting the chisel shank 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.

Ferner ist aus der DE-U 82 25 157 bekannt, eine längs geschlitzte Spannhülse vor dem Einsetzen in den Halter mittels einer zangenartigen Vorrichtung soweit zusammenzudrücken, wie es das Radialspiel und die Schlitze der Spannhülse erlauben. In diesem Zustand wird die Spannhülse in die Bohrung des Haltekörpers soweit eingeführt, wie es die Bauhöhe der zangenartigen Vorrichtung erlaubt. Diese Spannhülse besitzt auch eine aus weicherem Material als demjenigen des Schrämmeißelkopfes koaxial angeordnete Ringscheibe, deren Innendurchmesser nicht kleiner ist als der Außendurchmesser der Spannhülse im aufgespreizten Einbauzustand und die dazu dient, die dem Kopf des Schrämmeißels zugewandte Stirnfläche des Haltekörpers vor Beschädigungen zu schützen.Furthermore, it is known from DE-U 82 25 157 to compress a longitudinally slotted clamping sleeve before inserting it into the holder by means of a plier-like device as far as the radial play and the slots of the clamping sleeve allow. In this state, the clamping sleeve is inserted into the bore of the holding body as far as the overall height of the pliers-like device allows. This clamping sleeve also has an annular disk which is arranged coaxially from a material which is softer than that of the cutting bit head, the inside diameter of which is not smaller than the outside diameter of the clamping sleeve in the expanded installation state and which serves to protect the end face of the holding body facing the head of the cutting bit from damage.

Schließlich ist in der Zeitschrift "Glückauf", 1976, Seite A 327, ein Rundschaftmeißel mit einem Bund dargestellt, dessen Aufgabe es ist, den Verlust des Haltegliedes bei einem Meißel des Typs U-44 zu verhindern.Finally, in the magazine "Glückauf", 1976, page A 327, a round chisel with a collar is shown, the task of which is to prevent the loss of the holding member in a type U-44 chisel.

Aus der DE-A 34 39 491 ist ein Rundschaftmeißel bekannt, der eine Spannhülse und einen den Meißelschaft umgebenden Ring aufweist. Der Ring ist aus verschleißfestem Material gefertigt und dient ausschließlich als Verschleißschutz für den Meißelschaft und den Kragen der Bohrung im Meißelhalter.From DE-A 34 39 491 a round shank chisel is known which has an adapter sleeve and a ring surrounding the chisel shank. The ring is made of wear-resistant material and serves only as wear protection for the chisel shaft and the collar of the hole in the chisel holder.

Es ist Aufgabe der Erfindung, eine Befestigung eines Rundschaftmeißels der eingangs erwähnten Art zu schaffen, bei der 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 fastening of a round shank chisel of the type mentioned in the introduction, 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 vor dem Einsetzen des Rundschaftmeißel der Außendurchmesser der Spannhülse gleich oder kleiner ist als der Durchmesser der Bohrung und daß beim Einsetzen des Meißelschaftes mit der Spannhülse in die Bohrung das Halteglied in einen nicht von der Spannhülse umfaßten Bereich des Meißeischaftes bewegbar ist.This object is achieved according to the invention in that before the insertion of the round shank chisel, the outer diameter of the clamping sleeve is equal to or smaller than the diameter of the bore and that when the chisel shank is inserted with the clamping sleeve into the bore, the holding member in a region not covered by the clamping sleeve the chisel shaft is movable.

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 picks can then be hammered in with a hammer blow until the chisel head stops on the chisel holder. The holding member is pushed down from 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 Halteglied 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 holding ring or holding disk which surrounds the clamping sleeve and that the inside diameter of the holding ring or holding disk 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.So 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 extends to a distance from the chisel head that is equal to or larger than the diameter of the round material used for the retaining ring or the thickness of the washer.

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 vom 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 is before seen that the chisel head facing the chisel shaft ends in a collar, 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 Rundschaftmeißei 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 Meißeischaft.
The invention is explained in more detail with reference to exemplary embodiments shown in the drawing. It shows:
  • Fig. 1 shows a round shaft bit with a holding member designed as a holding disc in the insertion position, in which the bit shaft with the clamping sleeve is inserted without bracing into the bore of a bit holder, 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 bit holder and freely rotating 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 Meißeischaftes 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 Meißeischaftes 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 essential 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 can be widely compressed 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 effort, e.g. 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, which is designed as a holding disk, 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 disc corresponds to the maximum outer diameter of the chisel head 11 in the region of the collar 13. The holding disc serves as a protective disc 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 Meißeischaftes 14 im Bereich der Umfangsnut 15.The embodiment of FIG. 2 differs only in the design of the holding member 19 from the embodiment of FIG. 1. FIG. 2 shows the round shank 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 in the front side facing the chisel head 11 the extension 23 which receives the retaining ring pushed down by the clamping sleeve 17. The area of the chisel shaft 14 that is free of the clamping sleeve 17 between the clamping sleeve 17 and the chisel head 11 must therefore have at least a width that 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. Round-shanked bit (10), which is insertable into the bore (21) provided in a bit holder (20), comprising a bit head (11) and a bit shank (14), wherein the bit shank (14) has a circumferential groove (15) with a longitudinally slotted clamping sleeve (17), mounted therein, and a ring (19) pushed-on so as to be dis- placable on the bit shank, characterised in that the ring is pushed onto the clamping sleeve (17) as a retaining member (19) and retains said sleeve in its clamped state, wherein the external diameter of the clamping sleeve (17) is smaller than the diameter of the bore (21) provided in the bit holder, so that, by inserting the bit shank (14) into the bore (21), the retaining member (19) is stripped from the clamping sleeve (17) and the clamping sleeve (17) is exposed for the securement of the bit (10) in the bit holder (20).
2. Round-shanked bit according to claim 1, characterised in that the bit head (11) extends into a collar (13) facing the bit shank.
3. Round-shanked bit according to one of claims 1 or 2, characterised in that the circumferential groove (15) provided in the bit shank (14) extends towards the bit head (11) and terminates with a spacing therefrom, which spacing is identical to, or greater than, the diameter of the round material, used for the retaining ring, or the thickness of the retaining disc.
4. Round-shanked bit according to one of claims 2 or 3, the bit head of which has a collar, characterised in that the bore (21) provided in the bit holder (20) has, at its inlet end, a widened portion (23) which accomodates the retaining member (19), in the form of a retaining ring, when the bit shank (14) is inserted onto the bore (21) with the clamping sleeve (17).
5. Round-shanked bit according to one of claims 1 to 4, characterized in that the retaining member (19), in the form of a retaining disc, is disposed between the bit head (11) and the wall of the bit holder (20), when the bit shank (14) is inserted into the bore (21) provided in the bit holder (20) with the clamping sleeve (17).
6. Round-shanked bit according to claim 5, characterised in that the retaining disc is formed from wear-resistant material and has an external diameter which is identical to, or greater than, the maximum external diameter of the collar of the bit head (11).
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
DE3701905 1987-01-23
DE3701905A DE3701905C1 (en) 1987-01-23 1987-01-23 Attachment of a round shank chisel

Publications (2)

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

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EP88100268A Expired - Lifetime EP0275890B1 (en) 1987-01-23 1988-01-12 Round shank pick

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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
US4818027A (en) 1989-04-04
EP0275890A1 (en) 1988-07-27
CA1296203C (en) 1992-02-25
DE3701905C1 (en) 1988-09-15
JP2655267B2 (en) 1997-09-17
AU596725B2 (en) 1990-05-10
AU1067688A (en) 1988-07-28
ZA88424B (en) 1988-07-07
ES2018053B3 (en) 1991-03-16
JPS63197795A (en) 1988-08-16

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