EP1945909A1 - Circular-shank tool comprising a tool holder - Google Patents

Circular-shank tool comprising a tool holder

Info

Publication number
EP1945909A1
EP1945909A1 EP06762197A EP06762197A EP1945909A1 EP 1945909 A1 EP1945909 A1 EP 1945909A1 EP 06762197 A EP06762197 A EP 06762197A EP 06762197 A EP06762197 A EP 06762197A EP 1945909 A1 EP1945909 A1 EP 1945909A1
Authority
EP
European Patent Office
Prior art keywords
clamping sleeve
chisel
shank
round shank
holding elements
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
EP06762197A
Other languages
German (de)
French (fr)
Other versions
EP1945909B1 (en
Inventor
Karl Kammerer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Betek GmbH and Co KG
Original Assignee
Betek Bergbau und Hartmetalltechnik Karl Heinz Simon GmbH and Co KG DE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Betek Bergbau und Hartmetalltechnik Karl Heinz Simon GmbH and Co KG DE filed Critical Betek Bergbau und Hartmetalltechnik Karl Heinz Simon GmbH and Co KG DE
Priority to PL06762197T priority Critical patent/PL1945909T3/en
Publication of EP1945909A1 publication Critical patent/EP1945909A1/en
Application granted granted Critical
Publication of EP1945909B1 publication Critical patent/EP1945909B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E21C35/197—Means for fixing picks or holders using sleeves, rings or the like, as main fixing elements

Definitions

  • the invention relates to a round shank bit with chisel holder, wherein the shank of the round shank chisel is held in the bore of the chisel holder by means of a slotted clamping sleeve, wherein the clamping sleeve is clamped to the bore wall of the bore and the shaft of the round shank chisel is rotatably held in the clamping sleeve, wherein the Clamping sleeve is provided with inwardly stamped and / or depressed holding elements, which are distributed over the circumference of the clamping sleeve and engage in a introduced into the shank of the round shank circumferential groove, so that the clamping sleeve is held immovably in the axial direction on the shank of the round shank chisel ,
  • the axial position of the clamping sleeve on the shank of the round shank chisel is important so that the front sides of the clamping sleeve exposed and the clamping sleeve has the smallest possible axial play.
  • the shaft of the round shank chisel in the clamping sleeve must be centered by the holding technique so that the shaft is freely rotatably guided in the, clamped in the bore of the chisel holder clamping sleeve.
  • a round shank chisel with bit holder of the type mentioned is known from EP O 264 015 A1 and DE 37 12 427 A1.
  • the holding elements are punctiform or web-like pressed inwards, so that they have a more or less large axial play in the circumferential groove of the shank, which also affects the round shank chisel in the bore of the chisel holder in the clamped clamping sleeve.
  • the holding elements in the circumferential groove of the shank of the round shank chisel do not provide sufficient guide surfaces for an unambiguous centering of the shank, whereby its rotational movement in the clamping sleeve is impaired.
  • the holding elements between two transverse to the longitudinal axis of the clamping sleeve directed punching edges are divided and stamped inwardly and / or pressed that extend the punching edges over part of the circumference of the clamping sleeve and each other at a distance have, which corresponds to the width of the circumferential groove in the shank of the round shank chisel, and that the holding elements facing the convex groove bottom of the circumferential groove form a coaxial, concave centering.
  • the clamping sleeve has three holding elements, of which a holding element facing the slot of the clamping sleeve, and that the other two holding elements are offset relative to the one holding element on the circumference of the clamping sleeve each by about 100 °.
  • the number of holding elements is reduced to a minimum.
  • the width of the circumferential groove and thus the width of the holding elements is selected about 1/7 to 1/6 of the axial dimension of the clamping sleeve and that the concave centering of the holding elements over an angular range of about 30 ° extend to 50 ° of the circumference of the clamping sleeve.
  • a further embodiment provides that the ends of the concave centering projections of the holding elements pass over a convex curve a transition section and a concave curve in the inner wall of the clamping sleeve, the concave centering sections opposite the convex outer portions of the clamping sleeve at the ends pass over a concave curve in the outer wall of the clamping sleeve.
  • the holding elements are stamped and / or pressed inwards to such an extent that the convex outer sections facing the concave centering sections are spaced from the inner wall of the clamping sleeve, and the depth of the circumferential groove in the shank of the round shank chisel is so is dimensioned that abut the concave centering of the holding elements clamped in the bore of the chisel holder clamping sleeve on the groove bottom of the circumferential groove or occupy a small distance to this. This optimizes the centering of the shank of the round shank chisel in the clamping sleeve.
  • the critical point of the clamping sleeve lies on the side of the chisel tip facing the end of the clamping sleeve.
  • an embodiment provides that the chisel tip facing end face of the clamping sleeve is at a distance from the conical insertion section of the hole in the chisel holder, which has a conical shoulder of the chisel head or a centering approach a arranged between bit holder and chisel head wear plate receives.
  • Fig. 1 is a side view of the new clamping sleeve on the slot seen the same;
  • FIG. 2 shows a longitudinal section through the clamping sleeve along the line U-II of FIG. 1;
  • FIG. 3 shows a cross section through the clamping sleeve along the line III-III of FIG.
  • Fig. 4 is a partial longitudinal section through a round shank bit with bit holder, in which a clamping sleeve of FIG. 1 to 3 applied to the shaft and inserted into the bore of the bit holder.
  • the clamping sleeve 10 carries a parallel to the longitudinal axis 19 slot 11 and distributed over the circumference of three holding elements 16, 17, 18.
  • the holding element 16 is located opposite the slot 11.
  • the holding elements 16, 17, 18 are each separated by two parallel punching edges 20 and 21, which are directed transversely to the longitudinal axis 19 and extend over an angle plate of about 30 ° to 50 ° of the circumference of the clamping sleeve 10.
  • the holding elements 16, 17 and 18 punched inwardly and / or depressed and form a convex groove bottom of the circumferential groove 39 coaxial, concave centering section 22nd
  • the holding elements 16, 17 and 18 are determined in their width by the distance of the punching edges 20 and 21 and matched to the width of the circumferential groove 39 in the shaft 31 of the round shank bit 30.
  • the concave centering sections 22 of the holding elements 16, 17 and 18 pass at their ends via a convex curve 26, a transition section and a concave curve 25 in the inner wall of the clamping sleeve 10, while the concave centering sections 22 opposite convex réelleabschnit- te of the holding elements 16, 17 and 18 at their ends over a concave curve 24, a transition section and a convex curve 23 in the outer wall of the clamping sleeve 10 pass.
  • the holding elements 16, 17, and 18 are stamped and / or pressed inwards to such an extent that their concave centering sections 22 in the bore 41 of the chisel holder 40 in the bore 41 of the chisel holder 40 against the convex groove bottom of the circumferential groove 39 the shaft 31 abut or are at a small distance to this, which in turn benefits the free rotatability of the shaft 31 in the clamping sleeve 10.
  • the depth of the circumferential groove 39 in the shank 31 of the round shank bit 30 is further dimensioned such that the convex outer portions of the holding elements 16, 17 and 18 still occupy a small distance from the inner wall of the clamping sleeve 10, as also shown in FIG ,
  • the width of the holding elements 16, 17 and 18 is about 1/7 to 1/6 of the length of the clamping sleeve 10, as shown in FIG. 2.
  • the holding elements 16, 17 and 18, as in the known round shank chisels with chisel holder in the end of clamping sleeve 10 and shank 31 be arranged net, which is turned away from the chisel tip and provided with the circumferential groove 39.
  • the holding elements 16, 17 and 18 may also be arranged in the region of the central transverse plane 38 of the clamping sleeve 10 and in which engage in the region of the shaft 31 introduced circumferential groove 39.
  • the clamping sleeve 10 can then be applied in two positions on the shaft 31 and fixed in one of two identical positions thereon. This facilitates the installation of the clamping sleeve 10, since it does not have to be brought into a specific position to the shaft 31 before.
  • the centering of the shaft 31 and the free rotatability of the same is improved because the clamping sleeve 10 can tilt less in their longitudinal direction.
  • the circumferential groove 39 in the shaft 31 and the holding elements 16, 17 and 18 are coordinated so that the chisel tip 37 facing end face 12 does not project into the conical insertion portion 42 of the bore 41 in the bit holder 40 and is exposed ,
  • the conical insertion portion 42 of the chisel head 36 projects with a conical shoulder 32 of the collar 33, to which the withdrawal throat 34 and the discharge collar 35 of the chisel head 36 connects.
  • the chisel tip 37 made of hard metal is inserted in the chisel head 36.
  • a wear disk can also be arranged between the bit head 36 and the bit holder 40, which protrudes with a centering projection into the conical insertion section 42 of the bore 41 in the bit holder 40 and thus does not come into contact with the opposite end face 12 of the clamping sleeve 10.

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)
  • Gripping On Spindles (AREA)
  • Earth Drilling (AREA)
  • Drilling Tools (AREA)
  • Adornments (AREA)
  • Food-Manufacturing Devices (AREA)
  • Stringed Musical Instruments (AREA)
  • Knives (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Milling Processes (AREA)

Abstract

The chisel has retaining units (16,18) divided between two pressing edges (20,21) adjusted transverse to a longitudinal axis of a clamping sleeve and pressed such that the edges extend over a part of a circumference of the sleeve and are at a distance from each other. The distance corresponds to the width of a peripheral groove in a shank. The units form a co-axial concave central section (22) that is turned to a convex groove base.

Description

Rundschaftmeißel mit MeißelhalterRound shank chisel with chisel holder
Die Erfindung betrifft einen Rundschaftmeißel mit Meißelhalter, bei dem der Schaft des Rundschaftmeißels mittels einer geschlitzten Spannhülse in der Bohrung des Meißelhalters gehalten ist, wobei die Spannhülse an der Bohrungswandung der Bohrung verspannt ist und der Schaft des Rundschaftmeißels drehbar in der Spannhülse gehalten ist, wobei die Spannhülse mit nach innen eingestanzten und/oder eingedrückten Halteelementen versehen ist, die über den Umfang der Spannhülse verteilt sind und in eine in den Schaft des Rundschaftmeißels eingebrachte Umfangsnut ein- greifen, so dass die Spannhülse in axialer Richtung unverschiebbar auf dem Schaft des Rundschaftmeißels festgehalten ist.The invention relates to a round shank bit with chisel holder, wherein the shank of the round shank chisel is held in the bore of the chisel holder by means of a slotted clamping sleeve, wherein the clamping sleeve is clamped to the bore wall of the bore and the shaft of the round shank chisel is rotatably held in the clamping sleeve, wherein the Clamping sleeve is provided with inwardly stamped and / or depressed holding elements, which are distributed over the circumference of the clamping sleeve and engage in a introduced into the shank of the round shank circumferential groove, so that the clamping sleeve is held immovably in the axial direction on the shank of the round shank chisel ,
Bei einem derartigen Rundschaftmeißel mit Meißelhalter ist die axiale Stellung der Spannhülse auf dem Schaft des Rundschaftmeißels wichtig, damit die Stirnseiten der Spannhülse freiliegen und die Spannhülse ein möglichst kleines Axialspiel besitzt. Zudem muss der Schaft des Rundschaftmeißels in der Spannhülse durch die Haltetechnik so zentriert sein, dass der Schaft frei drehbar in der, in der Bohrung des Meißelhalters verspannten Spannhülse geführt ist. Ein Rundschaftmeißel mit Meißelhalter der eingangs erwähnten Art ist aus der EP O 264 015 A1 und der DE 37 12 427 A1 bekannt. Bei diesen Rundschaftmeißeln mit Meißelhalter sind die Halteelemente punkt- oder stegartig nach innen eingedrückt, so dass sie in der Umfangsnut des Schaftes ein mehr oder weniger großes Axialspiel aufweisen, das sich bei verspannter Spannhülse in der Bohrung des Meißelhalters auch auf den Rundschaftmeißel auswirkt. Zudem bieten die Halteelemente in der Umfangsnut des Schaftes des Rundschaftmeißels keine ausreichenden Führungsflächen für eine eindeutige Zentrierung des Schaftes, wodurch dessen Drehbewegung in der Spannhülse beeinträchtigt ist.In such a round shank chisel with chisel holder, the axial position of the clamping sleeve on the shank of the round shank chisel is important so that the front sides of the clamping sleeve exposed and the clamping sleeve has the smallest possible axial play. In addition, the shaft of the round shank chisel in the clamping sleeve must be centered by the holding technique so that the shaft is freely rotatably guided in the, clamped in the bore of the chisel holder clamping sleeve. A round shank chisel with bit holder of the type mentioned is known from EP O 264 015 A1 and DE 37 12 427 A1. In these round shank chisels with chisel holder, the holding elements are punctiform or web-like pressed inwards, so that they have a more or less large axial play in the circumferential groove of the shank, which also affects the round shank chisel in the bore of the chisel holder in the clamped clamping sleeve. In addition, the holding elements in the circumferential groove of the shank of the round shank chisel do not provide sufficient guide surfaces for an unambiguous centering of the shank, whereby its rotational movement in the clamping sleeve is impaired.
Es ist Aufgabe der Erfindung, bei einem Rundschaftmeißel mit Meißelhalter der eingangs erwähnten Art die Halteelemente der Spannhülse so zugestalten, dass sie das Axialspiel reduzieren, die Zentrierung des Schaftes in der Spannhülse so verbessern, dass sich der Schaft in der Spannhülse ohne Beeinträchtigung drehen kann.It is an object of the invention in a round shank chisel with bit holder of the type mentioned the retaining elements of the clamping sleeve so shaped that they reduce the axial play, the centering of the shaft in the clamping sleeve so improve that the shaft can rotate in the collet without interference.
Diese Aufgabe wird nach der Erfindung dadurch gelöst, dass die Halteelemente zwischen zwei quer zur Längsachse der Spannhülse gerichteten Stanzkanten abgeteilt und nach innen eingestanzt und/oder eingedrückt sind, dass sich die Stanzkanten über einen Teil des Umfanges der Spannhülse erstrecken und zueinander einen Ab- stand aufweisen, der der Breite der Umfangsnut im Schaft des Rundschaftmeißels entspricht, und dass die Halteelemente dem konvexen Nutgrund der der Umfangsnut zugekehrt einen koaxialen, konkaven Zentrierabschnitt bilden. Die Anpassung der Breite der Halteelemente an die Breite der Umfangsnut im Schaft des Rundschaftmeißels bringt eine Reduzierung des Axialspiels zwischen Spannhül- se und Schaft, während die dem konvexen Nutgrund der Umfangsnut mit zugekehrten koaxialen, konkaven Zentrierabschnitten der Halteelemente die Funktionen des Rundschaftmeißels im Meißelhalter optimiert. Nach einer einfachen Ausführung ist es vorgesehen, dass die Spannhülse drei Halteelemente aufweist, von denen ein Halteelement dem Schlitz der Spannhülse gegenüberliegt, und dass die beiden anderen Halteelemente gegenüber dem einen Halteelement am Umfang der Spannhülse jeweils um ca. 100° versetzt sind. Auf diese Weise wird die Anzahl der Halteelemente auf ein Minimum reduziert. Für die weitere Bemessung der Halteelemente ist vorgesehen, dass die Breite der Umfangsnut und damit die Breite der Halteelemente etwa 1/7 bis 1/6 der axialen Abmessung der Spannhülse gewählt ist und dass sich die konkaven Zentrierabschnitte der Halteelemente über einen Winkelbereich von etwa 30° bis 50° des Umfanges der Spannhülse erstrecken. Damit die Halteelemente keine scharfen Kanten bilden, die die Drehbewegung des Schaftes in der Spannhülse beeinträchtigen können, sieht eine weitere Ausgestaltung vor, dass die Enden der konkaven Zentrieransätze der Halteelemente über eine konvexe Rundung einen Übergangsabschnitt und eine konkave Rundung in die Innenwandung der Spannhülse übergehen, dass die den konkaven Zentrierab- schnitten gegenüberliegenden konvexen Außenabschnitte der Spannhülse an den Enden über eine konkave Rundung in die Außenwandung der Spannhülse übergehen.This object is achieved according to the invention in that the holding elements between two transverse to the longitudinal axis of the clamping sleeve directed punching edges are divided and stamped inwardly and / or pressed that extend the punching edges over part of the circumference of the clamping sleeve and each other at a distance have, which corresponds to the width of the circumferential groove in the shank of the round shank chisel, and that the holding elements facing the convex groove bottom of the circumferential groove form a coaxial, concave centering. The adaptation of the width of the retaining elements to the width of the circumferential groove in the shank of the round shank chisel brings a reduction in the axial clearance between the clamping sleeve and the shank, while the convex groove base of the circumferential groove with facing coaxial, concave centering sections of the retaining elements optimizes the functions of the shank bit in the chisel holder. According to a simple embodiment, it is provided that the clamping sleeve has three holding elements, of which a holding element facing the slot of the clamping sleeve, and that the other two holding elements are offset relative to the one holding element on the circumference of the clamping sleeve each by about 100 °. In this way, the number of holding elements is reduced to a minimum. For the further dimensioning of the holding elements is provided that the width of the circumferential groove and thus the width of the holding elements is selected about 1/7 to 1/6 of the axial dimension of the clamping sleeve and that the concave centering of the holding elements over an angular range of about 30 ° extend to 50 ° of the circumference of the clamping sleeve. So that the holding elements do not form sharp edges which may impair the rotational movement of the shank in the clamping sleeve, a further embodiment provides that the ends of the concave centering projections of the holding elements pass over a convex curve a transition section and a concave curve in the inner wall of the clamping sleeve, the concave centering sections opposite the convex outer portions of the clamping sleeve at the ends pass over a concave curve in the outer wall of the clamping sleeve.
Nach einer Weiterbildung ist vorgesehen, dass die Halteelemente so weit nach innen eingestanzt und/oder eingedrückt sind, dass die konvexen Außenabschnitte, die den konkaven Zentrierabschnitten gegenüberliegen, zu der Innenwandung der Spannhülse beabstandet sind, und dass die Tiefe der Umfangsnut im Schaft des Rundschaftmeißels so bemessen ist, dass die konkaven Zentrierabschnitte der Halteelemente bei in der Bohrung des Meißelhalters verspannten Spannhülse an dem Nutgrund der Umfangsnut anliegen oder einen kleinen Abstand zu diesem einnehmen. Damit wird die Zentrierung des Schaftes des Rundschaftmeißels in der Spannhülse optimiert. Der kritische Punkt der Spannhülse liegt auf der Seite der Meißelspitze zugekehrten Stirnseite der Spannhülse. Um Kollisionen mit dieser Stirnseite zu vermeiden, die zu einer Beeinträchtigung der Drehbewegungen des Rundschaftmeißels führen könnten, sieht eine Ausgestaltung vor, dass die der Meißelspitze zugekehrte Stirnseite der Spannhülse im Abstand zum konischen Einführabschnitt der Bohrung im Meißelhalter steht, der einen konischen Absatz des Meißelkopfes oder einen Zentrieransatz einer zwischen Meißelhalter und Meißelkopf angeordneten Verschleißscheibe aufnimmt.According to a further development, it is provided that the holding elements are stamped and / or pressed inwards to such an extent that the convex outer sections facing the concave centering sections are spaced from the inner wall of the clamping sleeve, and the depth of the circumferential groove in the shank of the round shank chisel is so is dimensioned that abut the concave centering of the holding elements clamped in the bore of the chisel holder clamping sleeve on the groove bottom of the circumferential groove or occupy a small distance to this. This optimizes the centering of the shank of the round shank chisel in the clamping sleeve. The critical point of the clamping sleeve lies on the side of the chisel tip facing the end of the clamping sleeve. In order to avoid collisions with this end face, which could lead to an impairment of the rotational movements of the round shank chisel, an embodiment provides that the chisel tip facing end face of the clamping sleeve is at a distance from the conical insertion section of the hole in the chisel holder, which has a conical shoulder of the chisel head or a centering approach a arranged between bit holder and chisel head wear plate receives.
Einen zusätzlich verbesserten Effekt auf die Zentrierung des Schaftes des Rundschaftmeißels in der Spannhülse wird nach einer Weiterbildung dadurch erreicht, dass die Halteelemente in der Mittelquerebene der Spannhülse angeordnet oder symmetrisch zu dieser angeordnet sind, und dass die Spannhülse in zwei um 180° um ihre Längsachse verdrehten axialen Stellungen auf dem Schaft des Rundschaft- meißeis aufbringbar und wahlweise in einer der beiden identischen Stellungen darauf festgelegt ist. Dabei wird gleichzeitig der Einbau, das heißt das Aufbringen der Spannhülse auf den Schaft des Rundschaftmeißels in die Bohrung des Meißelhalters erleichtert. Im Übrigen wird damit auch die Zentrierung der der Spannhülse verbessert. Werden zwei oder mehrere, symmetrisch zur Mittelquerebene angeordnete Reihen von Halteelementen verwendet, dann ergibt sich zusätzlich eine besonders stabile Abstützung des Meißelschaftes.An additional improved effect on the centering of the shank of the round shank chisel in the clamping sleeve is achieved according to a development characterized in that the holding elements are arranged in the median transverse plane of the clamping sleeve or arranged symmetrically to this, and that the clamping sleeve rotated in two by 180 ° about its longitudinal axis axial positions on the shank of the round shank and can be applied and optionally fixed in one of the two identical positions thereon. At the same time the installation, that is, the application of the clamping sleeve on the shank of the round shank chisel is facilitated in the bore of the chisel holder. Incidentally, this also improves the centering of the clamping sleeve. If two or more, arranged symmetrically to the median transverse plane rows of holding elements used, then in addition results in a particularly stable support of the drill collar.
Das Einsetzen des Rundschaftmeißels in die Bohrung des Meißelhalters wird dadurch begründet, dass die Außenkanten an den beiden Stirnseiten der Spannhülse abgeschrägt sind, wobei die abgeschrägten Außenkanten der Stirnseiten der Spannhülse im Winkel von ca. 30° zur Außenwandung der Spannhülse stehen.The insertion of the round shank chisel in the bore of the chisel holder is justified by the fact that the outer edges are chamfered at the two end faces of the clamping sleeve, wherein the bevelled outer edges of the end faces of the clamping sleeve are at an angle of approximately 30 ° to the outer wall of the clamping sleeve.
Die Erfindung wird anhand eines in den Zeichnungen dargestellten Ausführungsbeispieles näher erläutert. Es zeigen: Fig. 1 eine Seitenansicht der neuen Spannhülse auf den Schlitz derselben gesehen;The invention will be explained in more detail with reference to an embodiment shown in the drawings. Show it: Fig. 1 is a side view of the new clamping sleeve on the slot seen the same;
Fig. 2 einen Längsschnitt durch die Spannhülse entlang der Linie U-Il der Fig. 1 ;FIG. 2 shows a longitudinal section through the clamping sleeve along the line U-II of FIG. 1; FIG.
Fig. 3 einen Querschnitt durch die Spannhülse entlang der Linie Ill-Ill der Fig.3 shows a cross section through the clamping sleeve along the line III-III of FIG.
1 und1 and
Fig. 4 einen Teillängsschnitt durch einen Rundschaftmeißel mit Meißelhalter, bei dem eine Spannhülse nach Fig. 1 bis 3 auf dem Schaft aufgebracht und in die Bohrung des Meißelhalters eingesetzt ist.Fig. 4 is a partial longitudinal section through a round shank bit with bit holder, in which a clamping sleeve of FIG. 1 to 3 applied to the shaft and inserted into the bore of the bit holder.
Wie die Fig. 1 bis 3 zeigen, trägt die Spannhülse 10 einen zu der Längsachse 19 parallelen Schlitz 11 und über den Umfang verteilt drei Halteelemente 16, 17, 18. Das Halteelement 16 liegt gegenüber dem Schlitz 11. Die beiden anderen Halteelemente 17 und 18 sind um jeweils etwas α = 100° gegenüber dem Halteelement 16 am Umfang der Spannhülse 10 versetzt. Die Halteelemente 16, 17, 18 sind jeweils durch zwei parallele Stanzkanten 20 und 21 abgeteilt, die quer zur Längsachse 19 gerichtet sind und sich über einen Winkelblech von etwa 30° bis 50° des Umfanges der Spannhülse 10 erstrecken.As shown in FIGS. 1 to 3, the clamping sleeve 10 carries a parallel to the longitudinal axis 19 slot 11 and distributed over the circumference of three holding elements 16, 17, 18. The holding element 16 is located opposite the slot 11. The other two holding elements 17 and 18th are each offset by a little α = 100 ° relative to the holding element 16 on the circumference of the clamping sleeve 10. The holding elements 16, 17, 18 are each separated by two parallel punching edges 20 and 21, which are directed transversely to the longitudinal axis 19 and extend over an angle plate of about 30 ° to 50 ° of the circumference of the clamping sleeve 10.
Wie insbesondere der Querschnitt nach Fig. 3 zeigt, sind die Halteelemente 16, 17 und 18 nach innen eingestanzt und/oder eingedrückt und bilden einen zum konvexen Nutgrund der Umfangsnut 39 koaxialen, konkaven Zentrierabschnitt 22.As particularly shown in the cross section of Fig. 3, the holding elements 16, 17 and 18 punched inwardly and / or depressed and form a convex groove bottom of the circumferential groove 39 coaxial, concave centering section 22nd
Die Halteelemente 16, 17 und 18 werden in ihrer Breite durch den Abstand der Stanzkanten 20 und 21 bestimmt und auf die Breite der Umfangsnut 39 im Schaft 31 des Rundschaftmeißels 30 abgestimmt. Die konkaven Zentrierungsabschnitte 22 der Halteelemente 16, 17 und 18 gehen an ihren Enden über eine konvexe Rundung 26, einen Übergangsabschnitt und eine konkave Rundung 25 in die Innenwandung der Spannhülse 10 über, während die, den konkaven Zentrierabschnitten 22 gegenüberliegenden konvexen Außenabschnit- te der Halteelemente 16, 17 und 18 an ihren Enden über eine konkave Rundung 24, einen Übergangsabschnitt und eine konvexe Rundung 23 in die Außenwandung der Spannhülse 10 übergehen. Damit werden an den eingestanzten und/oder eingedrückten Halteelementen 16, 17 und 18 scharfe Kanten vermieden, die das freie Verdrehen des Schaftes 31 in der Spannhülse 10 und das satte Verspannen der Spannhülse 10 in der Bohrung 41 des Meißelhalters 40 beeinträchtigen können.The holding elements 16, 17 and 18 are determined in their width by the distance of the punching edges 20 and 21 and matched to the width of the circumferential groove 39 in the shaft 31 of the round shank bit 30. The concave centering sections 22 of the holding elements 16, 17 and 18 pass at their ends via a convex curve 26, a transition section and a concave curve 25 in the inner wall of the clamping sleeve 10, while the concave centering sections 22 opposite convex Außenabschnit- te of the holding elements 16, 17 and 18 at their ends over a concave curve 24, a transition section and a convex curve 23 in the outer wall of the clamping sleeve 10 pass. This sharp edges are avoided on the stamped and / or depressed holding elements 16, 17 and 18, which can affect the free rotation of the shaft 31 in the clamping sleeve 10 and the full clamping of the clamping sleeve 10 in the bore 41 of the bit holder 40.
Wie aus Fig. 3 weiter abzuleiten ist, sind die Halteelemente 16, 17, und 18 soweit nach innen eingestanzt und/oder eingedrückt, dass ihre konkaven Zentrierabschnitte 22 bei vorgespannter Spannhülse 10 in der Bohrung 41 des Meißelhalters 40 an dem konvexen Nutgrund der Umfangsnut 39 des Schaftes 31 anliegen oder zu diesem in geringem Abstand stehen, was wiederum der freien Verdrehbarkeit des Schaftes 31 in der Spannhülse 10 zugute kommt. Die Tiefe der Umfangsnut 39 im Schaft 31 des Rundschaftmeißels 30 ist dabei weiterhin so bemessen, dass die konvexen Außenabschnitte der Halteelemente 16, 17 und 18 noch einen kleinen Abstand zur Innen- wandung der Spannhülse 10 einnehmen, wie ebenfalls der Fig. 3 zu entnehmen ist. Die Breite der Halteelemente 16, 17 und 18 beträgt etwa 1/7 bis 1/6 der Länge der Spannhülse 10, wie die Fig. 2 zeigt.As can be further deduced from FIG. 3, the holding elements 16, 17, and 18 are stamped and / or pressed inwards to such an extent that their concave centering sections 22 in the bore 41 of the chisel holder 40 in the bore 41 of the chisel holder 40 against the convex groove bottom of the circumferential groove 39 the shaft 31 abut or are at a small distance to this, which in turn benefits the free rotatability of the shaft 31 in the clamping sleeve 10. The depth of the circumferential groove 39 in the shank 31 of the round shank bit 30 is further dimensioned such that the convex outer portions of the holding elements 16, 17 and 18 still occupy a small distance from the inner wall of the clamping sleeve 10, as also shown in FIG , The width of the holding elements 16, 17 and 18 is about 1/7 to 1/6 of the length of the clamping sleeve 10, as shown in FIG. 2.
Dabei können die Halteelemente 16, 17 und 18, wie bei den bekannten Rundschaftmeißeln mit Meißelhalter im Endbereich von Spannhülse 10 und Schaft 31 angeord- net sein, der der Meißelspitze abgekehrt und mit der Umfangsnut 39 versehen ist.In this case, the holding elements 16, 17 and 18, as in the known round shank chisels with chisel holder in the end of clamping sleeve 10 and shank 31 be arranged net, which is turned away from the chisel tip and provided with the circumferential groove 39.
Um die Zentrierung des Schaftes 31 in der Spannhülse 10 und dessen freie Verdrehbarkeit zu verbessern, können die Halteelemente 16, 17 und 18 auch im Bereich der Mittelquerebene 38 der Spannhülse 10 angeordnet sein und in die in die- sem Bereich des Schaftes 31 eingebrachte Umfangsnut 39 eingreifen. Die Spannhülse 10 kann dann in zwei Stellungen auf den Schaft 31 aufgebracht und in eine von zwei identischen Stellungen darauf festgelegt werden. Dies erleichtert den Einbau der Spannhülse 10, da sie vorher nicht in eine ganz bestimmte Stellung zum Schaft 31 gebracht werden muss. Zudem wird die Zentrierung des Schaftes 31 und die freie Verdrehbarkeit desselben verbessert, da sich die Spannhülse 10 in ihrer Längsrichtung weniger verkanten kann.In order to improve the centering of the shaft 31 in the clamping sleeve 10 and its free rotatability, the holding elements 16, 17 and 18 may also be arranged in the region of the central transverse plane 38 of the clamping sleeve 10 and in which engage in the region of the shaft 31 introduced circumferential groove 39. The clamping sleeve 10 can then be applied in two positions on the shaft 31 and fixed in one of two identical positions thereon. This facilitates the installation of the clamping sleeve 10, since it does not have to be brought into a specific position to the shaft 31 before. In addition, the centering of the shaft 31 and the free rotatability of the same is improved because the clamping sleeve 10 can tilt less in their longitudinal direction.
Wie Fig. 3 zeigt, sind die Umfangsnut 39 im Schaft 31 und die Halteelemente 16, 17 und 18 so aufeinander abgestimmt, dass auch die der Meißelspitze 37 zugekehrte Stirnseite 12 nicht in den konischen Einführungsabschnitt 42 der Bohrung 41 im Meißelhalter 40 ragt und frei liegt. In den konischen Einführungsabschnitt 42 ragt der Meißelkopf 36 mit einen konischen Absatz 32 des Bundes 33, an den sich die Abzugskehle 34 und der Abzugsbund 35 des Meißelkopfes 36 anschließt. In den Mei- ßelkopf 36 ist die Meißelspitze 37 aus Hartmetall eingesetzt.As shown in FIG. 3, the circumferential groove 39 in the shaft 31 and the holding elements 16, 17 and 18 are coordinated so that the chisel tip 37 facing end face 12 does not project into the conical insertion portion 42 of the bore 41 in the bit holder 40 and is exposed , In the conical insertion portion 42 of the chisel head 36 projects with a conical shoulder 32 of the collar 33, to which the withdrawal throat 34 and the discharge collar 35 of the chisel head 36 connects. The chisel tip 37 made of hard metal is inserted in the chisel head 36.
Zwischen dem Meißelkopf 36 und dem Meißelhalter 40 kann auch eine Verschleißscheibe angeordnet sein, die mit einem Zentrieransatz in den konischen Einführungsabschnitt 42 der Bohrung 41 im Meißelhalter 40 ragt und so nicht mit der zuge- kehrten Stirnseite 12 der Spannhülse 10 in Kontakt kommt. A wear disk can also be arranged between the bit head 36 and the bit holder 40, which protrudes with a centering projection into the conical insertion section 42 of the bore 41 in the bit holder 40 and thus does not come into contact with the opposite end face 12 of the clamping sleeve 10.

Claims

Patentansprüche claims
1. Rundschaftmeißel (30) mit Meißelhalter (40), bei dem der Schaft (31) des Rundschaftmeißels (30) mittels einer geschlitzten Spannhülse (10) in der Bohrung (41) des Meißelhalters (40) gehalten ist, wobei die Spannhülse (10) an der Bohrungswandung der Bohrung (41) verspannt ist und der Schaft (31) desA round shank bit (30) with a bit holder (40), in which the shank (31) of the round shank chisel (30) is held in the bore (41) of the chisel holder (40) by means of a slotted clamping sleeve (10), wherein the clamping sleeve (10 ) is clamped to the bore wall of the bore (41) and the shank (31) of the
Rundschaftmeißels (30) drehbar in der Spannhülse (10) gehalten ist, wobei die Spannhülse (10) mit nach innen eingestanzten und/oder eingedrückten Halteelementen (16,17,18) versehen ist, die über den Umfang der Spannhülse (10) verteilt sind und in eine in den Schaft (31) des Rundschaftmeißels (30) eingebrachte Umfangsnut (39) eingreifen, so dass die Spannhülse (10) in axialer Richtung unverschiebbar auf dem Schaft (31) des Rundschaftmeißels (30) festgehalten ist, dadurch gekennzeichnet, dass die Halteelemente (16,17,18) zwischen zwei quer zur Längsachse (19) der Spannhülse (10) gerichteten Stanzkanten (20,21) abgeteilt und nach innen eingestanzt und/oder eingedrückt sind, dass sich die Stanzkanten (20,21) über einen Teil des Umfanges der Spannhülse (10) erstrecken und zueinander einen Abstand aufweisen, der der Breite der Umfangsnut (39) im Schaft (31) des Rundschaftmeißels (30) entspricht, und dass die Halteelemente (16,17,18) dem konvexen Nutgrund der der Umfangsnut (39) zugekehrt einen koaxialen, konkaven Zentrierabschnitt (22) bilden.Round shank chisel (30) is rotatably held in the clamping sleeve (10), wherein the clamping sleeve (10) is provided with inwardly stamped and / or depressed holding elements (16,17,18) which are distributed over the circumference of the clamping sleeve (10) and in a in the shank (31) of the round shank chisel (30) introduced circumferential groove (39) engage, so that the clamping sleeve (10) in the axial direction immovably on the shaft (31) of the round shank chisel (30) is held, characterized in that the holding elements (16,17,18) between two transverse to the longitudinal axis (19) of the clamping sleeve (10) directed punching edges (20,21) divided and stamped inwardly and / or are pressed, in that the punching edges (20, 21) extend over a part of the circumference of the clamping sleeve (10) and are at a distance from each other corresponding to the width of the circumferential groove (39) in the shank (31) of the round shank chisel (30), and in that the retaining elements (16,17,18) facing the convex groove bottom of the circumferential groove (39) form a coaxial, concave centering portion (22).
2. Rundschaftmeißel nach Anspruch 1 , dadurch gekennzeichnet, dass die Spannhülse (10) drei Halteelemente (16,17,18) aufweist, von denen ein Halteelement (16) dem Schlitz (11) der Spannhülse (10) gegenüberliegt, und dass die beiden anderen Halteelemente (17,18) gegenüber dem einen Halte- element (16) am Umfang der Spannhülse (10) jeweils um ca. 100° versetzt sind.2. Round shank bit according to claim 1, characterized in that the clamping sleeve (10) has three holding elements (16,17,18), of which a holding element (16) facing the slot (11) of the clamping sleeve (10), and that the two other holding elements (17,18) relative to the one holding element (16) on the circumference of the clamping sleeve (10) are each offset by approximately 100 °.
3. Rundschaftmeißel nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Breite der Umfangsnut (39) und damit die Breite der Halteelemente3. Round shank bit according to claim 1 or 2, characterized in that the width of the circumferential groove (39) and thus the width of the holding elements
(16,17,18) etwa 1/7 bis 1/6 der axialen Abmessung der Spannhülse (10) gewählt ist.(16,17,18) about 1/7 to 1/6 of the axial dimension of the clamping sleeve (10) is selected.
4. Rundschaftmeißel nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass sich die konkaven Zentrierabschnitte (22) der Halteelemente (16,17,18) über einen Winkelbereich von etwa 30° bis 50° des Umfanges der Spannhülse (10) erstrecken. 4. Round shank bit according to one of claims 1 to 3, characterized in that the concave centering portions (22) of the holding elements (16,17,18) over an angular range of about 30 ° to 50 ° of the circumference of the clamping sleeve (10) extend.
5. Rundschaftmeißel nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Enden der konkaven Zentrieransätze (22) der Halteelemente5. Round shank bit according to one of claims 1 to 4, characterized in that the ends of the concave centering lugs (22) of the holding elements
(16,17,18) über eine konvexe Rundung (26) einen Übergangsabschnitt und eine konkave Rundung (25) in die Innenwandung der Spannhülse (10) übergehen, dass die den konkaven Zentrierabschnitten (22) gegenüberliegenden konve- xen Außenabschnitte der Spannhülse (10) an den Enden über eine konkave(16,17,18) pass over a convex curve (26) a transition section and a concave curve (25) in the inner wall of the clamping sleeve (10) that the concave centering sections (22) opposite convex outer portions of the clamping sleeve (10 ) at the ends over a concave
Rundung (23) in die Außenwandung der Spannhülse (10) übergehen.Go round (23) in the outer wall of the clamping sleeve (10).
6. Rundschaftmeißel nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Halteelemente (16,17,18) so weit nach innen eingestanzt und/oder eingedrückt sind, dass die konvexen Außenabschnitte, die den konkaven Zentrierabschnitten (22) gegenüberliegen, zu der Innenwandung der Spannhülse (10) beabstandet sind, und dass die Tiefe der Umfangsnut (39) im Schaft (31) des Rundschaftmeißels6. Round shank bit according to one of claims 1 to 5, characterized in that the holding elements (16,17,18) are stamped and / or pressed so far inward that the convex outer portions which are opposite to the concave centering sections (22) to the inner wall of the clamping sleeve (10) are spaced, and that the depth of the circumferential groove (39) in the shank (31) of the round shank chisel
(30) so bemessen ist, dass die konkaven Zentrierabschnitte (22) der Halteelemente (16,17,18) bei in der Bohrung (41) des Meißelhalters (40) verspannten Spannhülse (10) an dem Nutgrund der Umfangsnut (39) anliegen oder einen kleinen Abstand zu diesem einnehmen. (30) is dimensioned so that the concave centering portions (22) of the holding elements (16,17,18) in the bore (41) of the chisel holder (40) braced clamping sleeve (10) against the groove bottom of the circumferential groove (39) or take a small distance to this.
7. Rundschaftmeißel nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die der Meißelspitze (37) zugekehrte Stirnseite (11 ) der Spannhülse (10) im Abstand zum konischen Einführabschnitt (42) der Bohrung (41) im Meißel- halter (40) steht, der einen konischen Absatz (32) des Meißelkopfes (36) oder einen Zentrieransatz einer zwischen Meißelhalter (40) und Meißelkopf (36) angeordneten Verschleißscheibe aufnimmt.7. Round shank bit according to one of claims 1 to 6, characterized in that the chisel tip (37) facing end face (11) of the clamping sleeve (10) at a distance from the conical insertion section (42) of the bore (41) in the chisel holder (40 ) which receives a conical shoulder (32) of the bit head (36) or a centering shoulder of a wear plate located between the bit holder (40) and the bit head (36).
8. Rundschaftmeißel nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Halteelemente (16,17,18) in der Mittelquerebene (38) der Spannhülse (10) angeordnet oder symmetrisch zu dieser angeordnet sind, und dass die Spannhülse (10) in zwei um 180° um ihre Längsachse (19) verdrehten axialen Stellungen auf dem Schaft (31) des Rundschaftmeißels (30) auf- bringbar und wahlweise in einer der beiden identischen Stellungen darauf festgelegt ist.8. round shank bit according to one of claims 1 to 7, characterized in that the holding elements (16,17,18) in the median transverse plane (38) of the clamping sleeve (10) are arranged or arranged symmetrically to this, and that the clamping sleeve (10) in two 180 ° about its longitudinal axis (19) twisted axial positions on the shaft (31) of the round shank chisel (30) can be mounted and optionally fixed in one of the two identical positions thereon.
9. Rundschaftmeißel nach Anspruch 8, dadurch gekennzeichnet, dass die Außenkanten (14,15) an den beiden Stirnseiten (12,13) der Spannhülse (10) abgeschrägt sind.9. Round shank bit according to claim 8, characterized in that the outer edges (14,15) at the two end faces (12,13) of the clamping sleeve (10) are chamfered.
10. Rundschaftmeißel nach Anspruch, dadurch gekennzeichnet, dass die abgeschrägten Außenkanten (14,15) der Spannhülse (10) im Winkel von ca. 30° zur Außenwandung der Spannhülse (10) stehen. 10. Round shank bit according to claim, characterized in that the bevelled outer edges (14,15) of the clamping sleeve (10) at an angle of approximately 30 ° to the outer wall of the clamping sleeve (10).
EP06762197A 2005-10-27 2006-06-27 Circular-shank tool comprising a tool holder Active EP1945909B1 (en)

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Application Number Priority Date Filing Date Title
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DE102005051449A DE102005051449B3 (en) 2005-10-27 2005-10-27 Circular shank chisel, has retaining units divided between edges, which are at distance from each other and extend over part of circumference of clamping sleeve, where units form co-axial concave central section turned to convex groove base
PCT/EP2006/006158 WO2007048456A1 (en) 2005-10-27 2006-06-27 Circular-shank tool comprising a tool holder

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EP1945909B1 EP1945909B1 (en) 2009-09-09

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US (1) US7922257B2 (en)
EP (1) EP1945909B1 (en)
JP (1) JP4741675B2 (en)
KR (1) KR101004371B1 (en)
CN (2) CN101297100B (en)
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AU (1) AU2006308265B2 (en)
DE (3) DE102005051449B3 (en)
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TW200726901A (en) 2007-07-16
DE502006004821D1 (en) 2009-10-22
CN101297100A (en) 2008-10-29
RU2008116675A (en) 2009-10-27
US7922257B2 (en) 2011-04-12
US20090160237A1 (en) 2009-06-25
CN101696630B (en) 2013-02-06
JP2009513850A (en) 2009-04-02
CN101297100B (en) 2011-04-06
JP4741675B2 (en) 2011-08-03
CN101696630A (en) 2010-04-21
DK1945909T3 (en) 2010-01-18
PL1945909T3 (en) 2010-02-26
ES2333468T3 (en) 2010-02-22
TWI341898B (en) 2011-05-11
DE202006020765U1 (en) 2009-12-10
WO2007048456A1 (en) 2007-05-03
AU2006308265A1 (en) 2007-05-03
DE102005051449B3 (en) 2007-03-01
EP1945909B1 (en) 2009-09-09
AU2006308265B2 (en) 2010-03-11
KR101004371B1 (en) 2010-12-27
ATE442514T1 (en) 2009-09-15
KR20080069582A (en) 2008-07-28
RU2380538C2 (en) 2010-01-27

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