EP0201073B1 - Pick holder for a cutting tool - Google Patents

Pick holder for a cutting tool Download PDF

Info

Publication number
EP0201073B1
EP0201073B1 EP86106156A EP86106156A EP0201073B1 EP 0201073 B1 EP0201073 B1 EP 0201073B1 EP 86106156 A EP86106156 A EP 86106156A EP 86106156 A EP86106156 A EP 86106156A EP 0201073 B1 EP0201073 B1 EP 0201073B1
Authority
EP
European Patent Office
Prior art keywords
ring
bit
bit holder
hard metal
annular groove
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
Application number
EP86106156A
Other languages
German (de)
French (fr)
Other versions
EP0201073A3 (en
EP0201073A2 (en
Inventor
Hans Dipl.-Ing. Jun. Krummenauer
Hans-Otto Schley
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.)
HANS KRUMMENAUER GmbH and Co KG
Original Assignee
HANS KRUMMENAUER GmbH and Co KG
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 HANS KRUMMENAUER GmbH and Co KG filed Critical HANS KRUMMENAUER GmbH and Co KG
Publication of EP0201073A2 publication Critical patent/EP0201073A2/en
Publication of EP0201073A3 publication Critical patent/EP0201073A3/en
Application granted granted Critical
Publication of EP0201073B1 publication Critical patent/EP0201073B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • 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 innovation relates to a chisel holder for a cutting tool, which holds the chisel, in particular in a hard metal chuck, the chisel being secured against axial emergence from the chisel holder by a resiliently locking holding element engaging an annular groove of the chisel and secured against rotation by a Flattening or other recess on the circumference of a rear chisel section and a border of this chisel section adapted to the relevant circumference.
  • a chisel holder is known in which the chisel is only secured against axial emergence from the chisel holder by an elastic cap attached to its rear end.
  • the cap is divided into radial projections, which are axially inclined in such a way that they bend radially back when the bit is inserted into the bit holder and spread behind it.
  • the chisel likewise rotatable, is held axially by an elastic ring which clamps in the chisel holder.
  • the chisel holder mentioned at the outset is known from DE-U-78 30 854.
  • the holding element mentioned there consists of two resilient rods which tangentially engage in the annular groove, and the surround of the rear bit section consists of an attachment welded to the rear side of the bit holder.
  • the innovation is based on the task of creating a chisel holder with a more permanent rotation lock, for the same chisel.
  • a chisel holder of the type described at the outset in which the said holding element is a radially resilient ring which engages in the annular groove and which has a seat which is adapted to it in the chisel holder and is held in this by the said border of the rear chisel section forming hard metal ring, which in turn is held axially and is secured against rotation by a flattened or other recess on its circumference and a circumference adapted to the relevant circumference, welded to the rest of the bit holder.
  • This proposal represents a new overall concept of the axial and rotation lock, especially from the point of view of the space available.
  • the holding element was converted from the two axial bars into the radially resilient ring, which, seen from the rear, can be arranged somewhat lower in the bit holder and thus leaves the hard metal ring the necessary space for its axial extension, but also for its radial extension, because the axial recesses previously required to keep the holding rods free can be omitted in the area of the current hard metal ring for the holding element in the form of the elastic ring.
  • the said ring consists of an elastic plastic and it engages in the ring groove of the chisel with an inner collar, behind which it has an annular groove on its outer circumference.
  • the ring groove on the outer circumference of the ring creates the space required for radial flexibility behind the collar. In view of this purpose, it is preferably wider than the inner waistband. At the same time, this alternative space is also closed quite tightly, so that it does not become clogged with dirt that could block the radial mobility of the inner collar.
  • the ring mentioned is made of metal, and it engages in the annular groove of the chisel with radially resilient segments which protrude obliquely backwards and inwards.
  • This ring made of metal has the advantage of certainly durable material compared to the aforementioned ring made of plastic, but is more complex.
  • the hard metal ring can be held axially by means of splining with its border, preferably by means of a U-shaped bracket.
  • the seat for the ring mentioned is drilled into the chisel holder with a diameter of 36 to 40 mm, preferably 37.5 to 38.5 mm, and to a depth compared to the rear bit holder end of 28 to 32 mm, preferably 29.5 to 30.5 mm.
  • the hard metal ring prefferably has an outer diameter and its border to have an inner diameter of 47 to 53 mm, preferably 49 to 51 mm, and / or both have an axial thickness of 12 to 15 mm, preferably 13 to 14 mm, and with the rear end of the chisel.
  • the border of the hard metal ring is preferably a ring welded to the rest of the bit holder. On this, regardless of the rest of the chisel holder, the adaptation to the flattening or other recess on the circumference of the hard metal ring can be formed more easily.
  • a chisel holder 1 which, together with a large number of other, identical chisel holders, is intended to be arranged on the circumference of a cutting roller, has a chisel 3 in a through bore 2.
  • the main position of the chisel 3 is in a hard metal sleeve 4 which is shrunk into the chisel holder. This encompasses a shaft 5 of the chisel with little play, and the chisel is supported on this end by a collar 6.
  • the chisel 3 is secured as follows to prevent it axially emerging from the chisel holder 1:
  • the chisel has an annular groove 9 cut into it with inclined walls 7 and 8 following its shank 5.
  • a seat 10 for a ring 11 made of elastic plastic is drilled out in the chisel holder 1.
  • the ring 11 is provided in the middle with an inner collar 12 and on the outside with an annular groove 13 which is wide in comparison to the inner collar.
  • the inner collar 12 engages in the annular groove 9 and lies against the wall 8 thereof. It is held in its seat 10 by a hard metal ring 14.
  • the chisel 3 is secured against turning as follows:
  • the previously mentioned hard metal ring 14 has a flat 15 on its outer circumference and a flat 16 with a curvature 17 on its inner circumference. It is seated in a ring 18, partially recessed in a recess on the back of the bit holder and welded to the bit holder body, the inner circumference of which matches the outer circumference of the hard metal ring 14, i.e. is provided with a counterpart to its flattening 15. It is held axially therein by a bracket 19, the two legs of which are inserted through aligned bores in the ring 18 and the hard metal ring 14.
  • the chisel 3 is seated in the hard metal ring 14 with its end portion which corresponds to the circumference with the inner circumference of the hard metal ring 14.
  • the relevant flattening on the chisel corresponding to the flattening 16 of the hard metal ring can be seen in FIG. 1 at 20. (The chisel is drawn in view in Fig. 1.)
  • Fig. 3 shows the hard metal ring 14, Fig. 4, the bracket 19 in view.
  • the inner collar 12 of the ring 11 is first pressed outwards by means of a cone 21 formed at the rear end of the chisel, which is made possible by the elasticity of the material and the evacuation space created with the annular groove 13.
  • the ring 11 again has approximately its original shape, shown in FIG. 1. Due to the oblique design of the wall of the annular groove 9, the chisel can be removed again in the same way.
  • the hard metal ring 14 withstands the changing contact between its flat 16 and the flat 20 of the chisel far longer than the previous rotation lock. If the hard metal ring 14 is worn, it can simply be replaced. The stress on the ring 18 due to the contact with the flattened portion 15 of the hard metal ring is comparatively low, since the same torques act here over larger lever arms and on larger surfaces.
  • the ring 11 made of plastic is replaced by a ring 22 made of steel and a further ring 23 used to hold it.
  • the ring 22 has four or more segments 25 separated by incisions 24, which essentially extend to the rear, but also somewhat radially inwards and, when the chisel is in use, lie against the oblique wall 8 of the chisel 3 instead of the inner collar 12.
  • Their radial compliance is based on their axial length component; they act as spiral springs.
  • the further ring 23 is separated from the ring 22.
  • the new chisel holder is also independent of the specified chisels, i.e. suitable for chisels of slightly different dimensions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Earth Drilling (AREA)

Description

Die Neuerung betrifft einen Meißelhalter für ein Schrämwerkzeug, der den Meißel, insbesondere in einem Hartmetallfutter, hält, wobei der Meißel gegen axiales Heraustreten aus dem Meißelhalter gesichert ist durch ein federnd rastendes, an einer Ringnut des Meißels angreifendes Halteelement und gegen Drehen gesichert ist durch eine Abflachung oder andere Ausnehmung am Umfang eines hinteren Meißelabschnittes und eine dem betreffenden Umfang angepaßte Einfassung dieses Meißelabschnittes.The innovation relates to a chisel holder for a cutting tool, which holds the chisel, in particular in a hard metal chuck, the chisel being secured against axial emergence from the chisel holder by a resiliently locking holding element engaging an annular groove of the chisel and secured against rotation by a Flattening or other recess on the circumference of a rear chisel section and a border of this chisel section adapted to the relevant circumference.

Aus der GB-A-2 105 768 ist eine Meißelhalterung bekannt, bei der der Meißel nur gegen axiales Heraustreten aus dem Meißelhalter gesichert ist durch eine an seinem rückwärtigen Ende angebrachte elastische Kappe. Die Kappe ist in radiale Vorsprünge unterteilt, die axial schräg angestellt sind derart, daß sie sich beim Einschieben des Meißels in den Meißelhalter radial zurückbiegen und hinter diesem spreizen.From GB-A-2 105 768 a chisel holder is known in which the chisel is only secured against axial emergence from the chisel holder by an elastic cap attached to its rear end. The cap is divided into radial projections, which are axially inclined in such a way that they bend radially back when the bit is inserted into the bit holder and spread behind it.

Nach der FR-A-2 357 726 ist der Meißel, gleichfalls drehbar, durch einen in dem Meißelhalter klemmenden elastischen Ring axial gehalten.According to FR-A-2 357 726, the chisel, likewise rotatable, is held axially by an elastic ring which clamps in the chisel holder.

Der eingangs genannte Meißelhalter ist aus der DE-U-78 30 854 bekannt. Das genannte Halteelement besteht dort aus zwei tangential in die Ringnut greifenden, federnden Stäben und die Einfassung des hinteren Meißelabschnitts aus einem an der Hinterseite des Meißelhalters angeschweißten Aufsatz.The chisel holder mentioned at the outset is known from DE-U-78 30 854. The holding element mentioned there consists of two resilient rods which tangentially engage in the annular groove, and the surround of the rear bit section consists of an attachment welded to the rear side of the bit holder.

Es hat sich gezeigt, daß dieser Aufsatz verhältnismäßig schnell ausgeschlagen wird.It has been shown that this article is rejected relatively quickly.

Der Neuerung liegt die Aufgabe zugrunde, einen Meißelhalter mit einer dauerhafteren Drehsicherung zu schaffen, und zwar für gleiche Meißel.The innovation is based on the task of creating a chisel holder with a more permanent rotation lock, for the same chisel.

Gemäß der Neuerung erfüllt diesen Zweck ein Meißelhalter der eingangs bezeichneten Art, bei dem das genannte Halteelement ein radial nachgiebig in die Ringnut greifender Ring ist, der in dem Meißelhalter einen ihm angepaßten Sitz hat und in diesem gehalten ist durch einen die genannte Einfassung des hinteren Meißelabschnittes bildenden Hartmetallring, der seinerseits axial gehalten ist und gegen Drehen gesichert ist durch eine Abflachung oder andere Ausnehmung an seinem Umfang und eine dem betreffenden Umfang angepaßte, mit dem übrigen Meißelhalter verschweißte Einfassung.According to the innovation, this purpose is met by a chisel holder of the type described at the outset, in which the said holding element is a radially resilient ring which engages in the annular groove and which has a seat which is adapted to it in the chisel holder and is held in this by the said border of the rear chisel section forming hard metal ring, which in turn is held axially and is secured against rotation by a flattened or other recess on its circumference and a circumference adapted to the relevant circumference, welded to the rest of the bit holder.

Dieser Vorschlag stellt ein neues Gesamtkonzept der Axial- und Drehsicherung vor allem unter dem Gesichtspunkt der Platzverhältnisse dar. Um bei den vorgegebenen Meißeln, die weiterverwendet werden können sollen, den Einsatz des Hartmetallringes zu ermöglichen, wurde das Halteelement aus den beiden axialen Stäben umgewandelt in den radial nachgiebigen Ring, der, von der Rückseite her gesehen, etwas tiefer in dem Meißelhalter angeordnet werden kann und damit dem Hartmetallring den nötigen Platz für dessen axiale Erstreckung läßt, aber auch für seine radiale Erstreckung, weil die vorher zum Freihalten der Haltestäbe notwendigen axialen Ausnehmungen im Bereich des jetzigen Hartmetallringes für das Halteelement in Form des elastischen Ringes entfallen können.This proposal represents a new overall concept of the axial and rotation lock, especially from the point of view of the space available. In order to enable the use of the hard metal ring for the given chisels, which should continue to be used, the holding element was converted from the two axial bars into the radially resilient ring, which, seen from the rear, can be arranged somewhat lower in the bit holder and thus leaves the hard metal ring the necessary space for its axial extension, but also for its radial extension, because the axial recesses previously required to keep the holding rods free can be omitted in the area of the current hard metal ring for the holding element in the form of the elastic ring.

Nach einer vorteilhaften Ausgestaltung der Neuerung besteht der genannte Ring aus einem elastischen Kunststoff, und er greift in die Ringnut des Meißels mit einem Innenbund, hinter dem er eine Ringnut an seinem Außenumfang aufweist.According to an advantageous embodiment of the innovation, the said ring consists of an elastic plastic and it engages in the ring groove of the chisel with an inner collar, behind which it has an annular groove on its outer circumference.

Die Ringnut am Außenumfang des Ringes schafft den für die radiale Nachgiebigkeit hinter dem Bund benötigten Platz. Mit Rücksicht auf diesen Zweck ist sie vorzugsweise breiter als der Innenbund. Zugleich ist dieser Ausweichraum aber auch ziemlich dicht abgeschlossen, so daß er sich nicht mit Schmutz vollsetzt, der die radiale Beweglichkeit des Innenbundes blockieren könnte.The ring groove on the outer circumference of the ring creates the space required for radial flexibility behind the collar. In view of this purpose, it is preferably wider than the inner waistband. At the same time, this alternative space is also closed quite tightly, so that it does not become clogged with dirt that could block the radial mobility of the inner collar.

Nach einer anderen Ausgestaltung der Neuerung besteht der genannte Ring aus Metall, und er greift mit schräg nach hinten und innen abstehenden, radial federnden Segmenten in die Ringnut des Meißels.According to another embodiment of the innovation, the ring mentioned is made of metal, and it engages in the annular groove of the chisel with radially resilient segments which protrude obliquely backwards and inwards.

Dieser Ring aus Metall hat gegenüber dem vorgenannten Ring aus Kunststoff den Vorteil des mit Sicherheit dauerhaften Materials, ist allerdings aufwendiger.This ring made of metal has the advantage of certainly durable material compared to the aforementioned ring made of plastic, but is more complex.

Aus Herstellungsgründen wird es sich empfehlen, den Ring aus Metall zweiteilig auszuführen bzw., anders betrachtet, den die federnden Segmente aufweisenden Ring schmaler zu halten und über einen angepaßten weiteren Ring durch den Hartmetallring zu halten.For manufacturing reasons, it is advisable to design the metal ring in two parts or, viewed differently, to keep the ring having the resilient segments narrower and to hold it via an adapted additional ring through the hard metal ring.

Der Hartmetallring kann durch eine Versplintung mit seiner Einfassung axial gehalten sein, vorzugsweise mittels eines U-förmigen Bügels.The hard metal ring can be held axially by means of splining with its border, preferably by means of a U-shaped bracket.

Unter den durch die vorhandenen Meißel vorgegebenen Größen verhältnissen dürfte es zweckmäßig sein, daß der Sitz für den genannten Ring in den Meißelhalter eingebohrt ist mit einem Durchmesser von 36 bis 40 mm, vorzugsweise 37,5 bis 38,5 mm, und bis zu einer Tiefe gegenüber dem hinteren Meißelhalterende von 28 bis 32 mm, vorzugsweise 29,5 bis 30,5 mm.Under the size given by the existing chisel, it should be appropriate that the seat for the ring mentioned is drilled into the chisel holder with a diameter of 36 to 40 mm, preferably 37.5 to 38.5 mm, and to a depth compared to the rear bit holder end of 28 to 32 mm, preferably 29.5 to 30.5 mm.

Weiter ist es zweckmäßig, daß der Hartmetallring einen Außendurchmesser und seine Einfassung einen Innendurchmesser von 47 bis 53 mm, vorzugsweise 49 bis 51 mm, aufweist und/oder beide eine axiale Dicke von 12 bis 15 mm, vorzugsweise 13 bis 14 mm, aufweisen und mit dem hinteren Meißelende fluchten.It is furthermore expedient for the hard metal ring to have an outer diameter and its border to have an inner diameter of 47 to 53 mm, preferably 49 to 51 mm, and / or both have an axial thickness of 12 to 15 mm, preferably 13 to 14 mm, and with the rear end of the chisel.

Die Einfassung des Hartmetallringes ist vorzugsweise ein mit dem übrigen Meißelhalter verschweißter Ring. An diesem läßt sich, unabhängig vom übrigen Meißelhalter, die Anpassung an die Abflachung oder andere - Ausnehmung am Umfang des Hartmetallringes leichter ausbilden.The border of the hard metal ring is preferably a ring welded to the rest of the bit holder. On this, regardless of the rest of the chisel holder, the adaptation to the flattening or other recess on the circumference of the hard metal ring can be formed more easily.

Die Zeichnungen geben Ausführungsbeispiele der Neuerung wieder.

  • Fig. 1 zeigt einen axialen Schnitt durch einen Meißelhalter,
  • Fig. 2 zeigt eine Ansicht des Meißelhalters gemäß Fig. 1 von unten,
  • Fig. 3 und 4 zeigen Einzelteile,
  • Fig. 5 zeigt in einem Ausschnitt und in größerem Maßstab eine Abwandlung von Fig. 1,
  • Fig. 6 zeigt ein Einzelteil aus Fig. 5 in Ansicht gemäß Fig. 5 von unten.
The drawings show exemplary embodiments of the innovation.
  • Fig. 1 shows an axial section through a Chisel holder,
  • FIG. 2 shows a view of the chisel holder according to FIG. 1 from below,
  • 3 and 4 show individual parts,
  • 5 shows in a detail and on a larger scale a modification of FIG. 1,
  • FIG. 6 shows an individual part from FIG. 5 in a view according to FIG. 5 from below.

Ein Meißelhalter 1, der zusammen mit einer Vielzahl weiterer, gleicher Meißelhalter zur Anordnung auf dem Umfang einer Schrämwalze bestimmt ist, weist in einer durchgehenden Bohrung 2 einen Meißel 3 auf.A chisel holder 1, which, together with a large number of other, identical chisel holders, is intended to be arranged on the circumference of a cutting roller, has a chisel 3 in a through bore 2.

Seinen hauptsächlichen Sitz hat der Meißel 3 in einer in den Meißelhalter eingeschrumpften Hartmetallhülse 4. Diese umfaßt mit geringem Spiel einen Schaft 5 des Meißels, und auf dieser ist der Meißel mit einem Bund 6 stirnseitig abgestützt.The main position of the chisel 3 is in a hard metal sleeve 4 which is shrunk into the chisel holder. This encompasses a shaft 5 of the chisel with little play, and the chisel is supported on this end by a collar 6.

Gegen axiales Heraustreten aus dem Meißel halter 1 ist der Meißel 3 wie folgt gesichert:The chisel 3 is secured as follows to prevent it axially emerging from the chisel holder 1:

Der Meißel weist im Anschluß an seinen Schaft 5 eine mit schrägen Wänden 7 und 8 eingeschnittene Ringnut 9 auf. Etwa auf gleicher Höhe ist in dem Meißelhalter 1 ein Sitz 10 für einen Ring 11 aus elastischem Kunststoff ausgebohrt. Der Ring 11 ist in der Mitte mit einem Innenbund 12 und außen mit einer im Vergleich zu dem Innenbund breiten Ringnut 13 versehen. Der Innenbund 12 greift in die Ringnut 9 und liegt an deren Wand 8 an. In seinem Sitz 10 gehalten ist er durch einen Hartmetallring 14.The chisel has an annular groove 9 cut into it with inclined walls 7 and 8 following its shank 5. Approximately at the same level, a seat 10 for a ring 11 made of elastic plastic is drilled out in the chisel holder 1. The ring 11 is provided in the middle with an inner collar 12 and on the outside with an annular groove 13 which is wide in comparison to the inner collar. The inner collar 12 engages in the annular groove 9 and lies against the wall 8 thereof. It is held in its seat 10 by a hard metal ring 14.

Gegen Drehen gesichert ist der Meißel 3 wie folgt:The chisel 3 is secured against turning as follows:

Der bereits erwähnte Hartmetallring 14 weist an seinem Außenumfang eine Abflachung 15 und auf der anderen Seite an seinem Innenumfang eine Abflachung 16 mit einer Einwölbung 17 auf. Er sitzt in einem teilweise in einer Ausfräsung an der Rückseite des Meißelhalters versenkten, mit dem Meißelhalterkörper verschweißten Ring 18, dessen Innenumfang dem Außenumfang des Hartmetallringes 14 angepaßt, d.h. mit einem Gegenstück zu dessen Abflachung 15 versehen ist. Axial darin gehalten wird er durch einen Bügel 19, dessen beide Schenkel durch fluchtende Bohrungen in dem Ring 18 und dem Hartmetallring 14 hindurchgesteckt sind. Der Meißel 3 sitzt mit seinem, am Umfang mit dem Innenumfang des Hartmetallringes 14 übereinstimmenden, Endabschnitt in dem Hartmetallring 14. Die betreffende, mit der Abflachung 16 des Hartmetallringes korrespondierende Abflachung am Meißel ist in Fig. 1 bei 20 zu erkennen. (Der Meißel ist in Fig. 1 in Ansicht gezeichnet.)The previously mentioned hard metal ring 14 has a flat 15 on its outer circumference and a flat 16 with a curvature 17 on its inner circumference. It is seated in a ring 18, partially recessed in a recess on the back of the bit holder and welded to the bit holder body, the inner circumference of which matches the outer circumference of the hard metal ring 14, i.e. is provided with a counterpart to its flattening 15. It is held axially therein by a bracket 19, the two legs of which are inserted through aligned bores in the ring 18 and the hard metal ring 14. The chisel 3 is seated in the hard metal ring 14 with its end portion which corresponds to the circumference with the inner circumference of the hard metal ring 14. The relevant flattening on the chisel corresponding to the flattening 16 of the hard metal ring can be seen in FIG. 1 at 20. (The chisel is drawn in view in Fig. 1.)

Fig. 3 zeigt den Hartmetallring 14, Fig. 4 den Bügel 19 in Ansicht.Fig. 3 shows the hard metal ring 14, Fig. 4, the bracket 19 in view.

Beim Einsetzen des Meißels 3 in den Meißelhalter 1 wird zunächst mittels eines am rückwärtigen Ende des Meißels ausgebildeten Konus' 21 der Innenbund 12 des Ringes 11 nach außen gedrückt, was durch die Elastizität des Materials und den mit der Ringnut 13 geschaffenen Ausweichraum ermöglicht wird. In der Endstellung hat der Ring 11 wieder etwa seine, in Fig. 1 dargestellte, ursprüngliche Form. Aufgrund der schrägen Ausbildung der Wand der Ringnut 9 läßt sich der Meißel in gleicher Weise wieder herausnehmen.When the chisel 3 is inserted into the chisel holder 1, the inner collar 12 of the ring 11 is first pressed outwards by means of a cone 21 formed at the rear end of the chisel, which is made possible by the elasticity of the material and the evacuation space created with the annular groove 13. In the end position, the ring 11 again has approximately its original shape, shown in FIG. 1. Due to the oblique design of the wall of the annular groove 9, the chisel can be removed again in the same way.

Der Hartmetallring 14 widersteht den wechselnden Berührungen zwischen seiner Abflachung 16 und der Abflachung 20 des Meißels weitaus länger als die bisherige Drehsicherung. Ist der Hartmetallring 14 verschlissen, kann er einfach ausgewechselt werden. Die Beanspruchung des Ringes 18 durch die Berührungen mit der Abflachung 15 des Hartmetallringes ist vergleichsweise gering, da hier die gleichen Drehmomente über größere Hebelarme und auf größeren Flächen wirken.The hard metal ring 14 withstands the changing contact between its flat 16 and the flat 20 of the chisel far longer than the previous rotation lock. If the hard metal ring 14 is worn, it can simply be replaced. The stress on the ring 18 due to the contact with the flattened portion 15 of the hard metal ring is comparatively low, since the same torques act here over larger lever arms and on larger surfaces.

Bei der Abwandlung nach Fig. 5 und 6 ist der Ring 11 aus Kunststoff ersetzt durch einen Ring 22 aus Stahl und einen zu dessen Halterung eingesetzten weiteren Ring 23.5 and 6, the ring 11 made of plastic is replaced by a ring 22 made of steel and a further ring 23 used to hold it.

Der Ring 22 weist vier oder mehrere durch Einschnitte 24 getrennte Segmente 25 auf, die sich im wesentlichen nach hinten, dabei aber auch etwas radial nach innen erstrecken und im eingesetzten Zustand des Meißels statt des Innenbundes 12 an der schrägen Wand 8 des Meißels 3 anliegen. Ihre radiale Nachgiebigkeit beruht auf ihrer axialen Längenkomponente; sie wirken als Biegefedern.The ring 22 has four or more segments 25 separated by incisions 24, which essentially extend to the rear, but also somewhat radially inwards and, when the chisel is in use, lie against the oblique wall 8 of the chisel 3 instead of the inner collar 12. Their radial compliance is based on their axial length component; they act as spiral springs.

Zur Herstellungsvereinfachung ist der weitere Ring 23 von dem Ring 22 getrennt.To simplify production, the further ring 23 is separated from the ring 22.

Abschließend sei auf die in den Zeichnungen eingetragenen Maßstäbe sowie auf die maßstabgetreue Ausführung der Zeichnungen hingewiesen. Wie schon weiter oben ausgeführt, sind für die Neuerung Platzprobleme bedeutsam gewesen, was sich im Ausführungsbeispiel in den Abmessungen äußert.Finally, reference is made to the scales entered in the drawings and to the true-to-scale execution of the drawings. As already explained above, space problems have been significant for the innovation, which is reflected in the dimensions in the exemplary embodiment.

Der neue Meißelhalber ist jedoch auch unabhängig von den vorgegebenen Meißeln, d.h. für Meißel etwas anderer Abmessungen, geeignet.However, the new chisel holder is also independent of the specified chisels, i.e. suitable for chisels of slightly different dimensions.

Claims (9)

1. Bit holder (1) of a cutting tool which holds the bit (3), in particular in a hard metal casing (4), whereby the bit (3) is secured against axial egress from the bit holder (1) by means of a resiliently locking holding element (11; 22) engaging an annular groove (9) of the bit (3), and is secured against turning by a flat (15) or other recess on the periphery of a rear bit section and an enclosure (14) of this bit section adapted to the respective periphery,
characterised in that
the said holding element (11; 22 ) is a ring (11; 22) engaging radially flexibly in the annular groove (9), which ring has a corresponding seat (10) in the bit holder (1) and is held therein by a hard metal ring (14) forming the said enclosure of the rear bit section, which ring in its turn is held axially and secured against turning by a flat (15) or other recess on its periphery and an enclosure (18) adapted to the respective periphery, welded to the remaining bit holder (1).
2. Bit holder according to Claim 1, characterised in that
the said ring (11) is made of an elastic plastic and engages in the annular groove (9) of the bit (3) with an internal flange (12) behind which it has an annular groove (13) on its external periphery.
3. Bit holder according to Claim 2, characterised in that
the annular groove (13) on the external periphery is axially wider than the internal flange (12).
4. Bit holder according to Claim 1, characterised in that
the said ring (22) is made of metal, and engages with radially resilient segments (25), projecting backwards and inwards in an inclined manner, in the annular groove (9) of the bit (3).
5. Bit holder according to Claim 4, characterised in that the ring (22) is held by the hard metal ring (14) by a corresponding further ring (23).
6. Bit holder according to one of Claims 1 to 5, characterised in that
the hard metal ring (14) is held axially within its enclosure (18) by a cotter (19), preferably by means of a U-shaped shackle (19).
7. Bit holder according to one of Claims 1 to 6, characterised in that
the seat (10) for the said ring (11; 22 ) is drilled into the bit holder (1) with a diameter of 36 to 40 mm, preferably 37.5 to 38.5 mm, and to a depth compared with the rear bit end of 28 to 32 mm, preferably 29.5 to 30.5 mm.
8. Bit holder according to one of Claims 1 to 7, characterised in that
the hard metal ring (14) has an external diameter and its enclosure an internal diameter of 47 to 53 mm, preferably 49 to 51 mm, and/or both have an axial thickness of 12 to 15 mm, preferably 13 to 14 mm and are aligned with the rear bit end.
9. Bit holder according to one of Claims 1 to 8,
characterised in that
the enclosure (18) of the hard metal ring (14) is a ring (18) welded to the remaining bit holder (1).
EP86106156A 1985-05-10 1986-05-06 Pick holder for a cutting tool Expired EP0201073B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8513913U 1985-05-10
DE8513913U DE8513913U1 (en) 1985-05-10 1985-05-10 Chisel holder for a cutting tool

Publications (3)

Publication Number Publication Date
EP0201073A2 EP0201073A2 (en) 1986-11-12
EP0201073A3 EP0201073A3 (en) 1987-02-04
EP0201073B1 true EP0201073B1 (en) 1988-06-08

Family

ID=6780969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86106156A Expired EP0201073B1 (en) 1985-05-10 1986-05-06 Pick holder for a cutting tool

Country Status (2)

Country Link
EP (1) EP0201073B1 (en)
DE (2) DE8513913U1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199058A (en) * 1986-11-20 1988-06-29 Boart Hwf Gmbh Co Kg Tool Holder
US5067775A (en) * 1988-04-21 1991-11-26 Kennametal Inc. Retainer for rotatable bits
WO1995027840A1 (en) * 1994-04-08 1995-10-19 Cutincoal Pty. Limited Improvements in securing clips for coal and rock picks
WO1995028550A2 (en) * 1994-04-14 1995-10-26 Kennametal Inc. Rotatable cutting bit and bit holder
WO2001023708A1 (en) 1999-09-28 2001-04-05 Voest-Alpine Bergtechnik Gesellschaft M.B.H. Device for detachably fixing a rounded-shaft tool into a tool bushing

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2455487C1 (en) * 2011-03-04 2012-07-10 Николай Митрофанович Панин Cutter for mining machines
CN203716962U (en) * 2013-01-04 2014-07-16 刘素华 Anti-rotation easy disassembly type reciprocating impact head of mining machine jacks
US10590632B2 (en) * 2017-01-09 2020-03-17 Caterpillar Inc. System for securing bits against rotation

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2630276C2 (en) * 1976-07-06 1985-06-13 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen Cutting bit arrangement, in particular for tunneling and mining machines
DE2757510A1 (en) * 1977-12-22 1979-06-28 Wallram Hartmetall Gmbh Polyamide or PTFE circlip - has section and is used as stop ring for trenching tools
FR2438739A3 (en) * 1978-08-24 1980-05-09 Krummenauer Kg H Tunnel borer tool holder - has flexible bar engaging tangentially in annular groove in tail of tool
AU518204B2 (en) * 1979-02-01 1981-09-17 Kennametal Inc. Road planing tool
DE2938453C2 (en) * 1979-09-22 1983-08-11 HWF Hartmetallwerkzeug-Fabrik Wallram GmbH & Co KG, 4300 Essen Tool set for cutting devices
AT367164B (en) * 1980-10-22 1982-06-11 Voest Alpine Ag TOOL TO REMOVE A CHISEL
GB2105768B (en) * 1981-09-14 1985-04-17 Wimet Mining Limited Improvements in or relating to cutting tools
GB2109438A (en) * 1981-10-21 1983-06-02 Salter & Co Ltd G Retaining means for use in mounting mining picks in pick bases

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199058A (en) * 1986-11-20 1988-06-29 Boart Hwf Gmbh Co Kg Tool Holder
US5067775A (en) * 1988-04-21 1991-11-26 Kennametal Inc. Retainer for rotatable bits
WO1995027840A1 (en) * 1994-04-08 1995-10-19 Cutincoal Pty. Limited Improvements in securing clips for coal and rock picks
WO1995028550A2 (en) * 1994-04-14 1995-10-26 Kennametal Inc. Rotatable cutting bit and bit holder
WO2001023708A1 (en) 1999-09-28 2001-04-05 Voest-Alpine Bergtechnik Gesellschaft M.B.H. Device for detachably fixing a rounded-shaft tool into a tool bushing

Also Published As

Publication number Publication date
EP0201073A3 (en) 1987-02-04
DE8513913U1 (en) 1985-06-20
DE3660289D1 (en) 1988-07-14
EP0201073A2 (en) 1986-11-12

Similar Documents

Publication Publication Date Title
DE3439491C2 (en)
EP0378964B1 (en) Trepanning tool
DE2436926C2 (en) Filing tool for dental purposes with an oscillating tool holder
EP0201073B1 (en) Pick holder for a cutting tool
DE3736274A1 (en) SUPPORTING DEVICE / HOLDING DEVICE
DE2617622C2 (en) Coupling nipple for connecting an implement with a handle
DE2700465A1 (en) THREAD TURNING CLUTCH
DE2644992A1 (en) Road surface stripper cutting mechanism - has lug shaped chisels rotating in radial depression on roller
DE2806796A1 (en) DRILL CHUCK
DE10359854A1 (en) Cylinder head drilling tool for use during processing of e.g. wood, has tool body with head, and cutting plate connected to front face of head, where body is made of fiber-reinforced plastic e.g. carbon/glass fiber-reinforced plastic
WO1991017964A1 (en) Pair of pincers
DE3829526C2 (en) Connecting rod crank device, in particular for actuating an air flap within a heating and air conditioning system for motor vehicles
DE2342679B2 (en) Collet assembly for dental handpieces
DE2752544C2 (en) Percussion bit
DE1213674B (en) Two-part solid cage for roller bearings
EP3335589A1 (en) Brush, in particular dish-washing brush
DE2458485C3 (en) Device for holding a rotary shank bit
DE2311463C3 (en) Brooms, mops, or the like
DE2632718C2 (en)
DE3708372C2 (en)
DE8207977U1 (en) BRACKET FOR HAND SHOWERS
DE4127758A1 (en) Brush for hair esp. with self-cleaning part - has tubular bristle support and perforated cleaning part, with barbs and fixture holes
DE838985C (en) Clamping head for central clamping of drills and similar tools
DE2929852C2 (en) Device for holding a tool shaft
DE859586C (en) Rotary feeder, especially for blow offset

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19870224

17Q First examination report despatched

Effective date: 19870623

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 3660289

Country of ref document: DE

Date of ref document: 19880714

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19890412

Year of fee payment: 4

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19890724

Year of fee payment: 4

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19900506

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19910131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19910201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST