EP2492054A1 - Tool holder - Google Patents

Tool holder Download PDF

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Publication number
EP2492054A1
EP2492054A1 EP12153455A EP12153455A EP2492054A1 EP 2492054 A1 EP2492054 A1 EP 2492054A1 EP 12153455 A EP12153455 A EP 12153455A EP 12153455 A EP12153455 A EP 12153455A EP 2492054 A1 EP2492054 A1 EP 2492054A1
Authority
EP
European Patent Office
Prior art keywords
working axis
groove
along
tool holder
longitudinal
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
EP12153455A
Other languages
German (de)
French (fr)
Other versions
EP2492054B1 (en
Inventor
Matthias Doberenz
Andres Wellmann Jelic
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP2492054A1 publication Critical patent/EP2492054A1/en
Application granted granted Critical
Publication of EP2492054B1 publication Critical patent/EP2492054B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084Rotating chucks or sockets
    • B25D17/088Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2217/00Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003Details relating to chucks with radially movable locking elements
    • B25D2217/0038Locking members of special shape
    • B25D2217/0042Ball-shaped locking members
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/231Sleeve details
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/301Torque transmission means

Definitions

  • the present invention relates to a tool holder, in particular for beating machine tools, e.g. Drilling machine tools that can be guided by hand.
  • beating machine tools e.g. Drilling machine tools that can be guided by hand.
  • the tool holder according to the invention has a receiving sleeve which has along a working axis a straight-prismatic or cylindrical cavity for receiving a tool and a slot for receiving a locking body.
  • a groove extending parallel to the working axis is provided on an inner surface of the receiving sleeve.
  • the groove is arranged extending the slot on the inner surface along the working axis.
  • the oblong hole may have a closed edge made up of two longitudinal sides opposite one another at a constant distance and two end sides terminating the oblong hole along the working axis.
  • the slot has in one direction, called the longitudinal direction, its largest dimension.
  • the longitudinal sides are parallel to the longitudinal direction, e.g. also parallel to the working axis, thus at a constant distance.
  • the other portions of the edge that are non-parallel to the longitudinal direction are associated with the termination pages.
  • the transition between longitudinal sides and end faces can be recognized by a change in inclination relative to the working axis, e.g. the longitudinal axes are parallel and therefore not inclined relative to the working axis, the end sides, however, are inclined over their entire length in different degrees, up to vertical, relative to the working axis.
  • the groove has an open side adjacent to one of the termination sides.
  • An embodiment provides that a groove bottom of the groove is perpendicular to a radial direction relative to the working axis.
  • the cavity is prismatic with a plurality of parallel to the working axis edges, and each of the longitudinal grooves is arranged at one of the edges corresponding angular positions.
  • the longitudinal groove along the working axis may be shorter than one of the edges. The groove widens the edge locally in the circumferential direction.
  • An extent along the working axis of at least one of the termination sides may be less than half the constant distance of the opposite longitudinal sides.
  • the at least one end side is flattened in relation to a semicircle connecting the longitudinal sides.
  • Fig.1 1 schematically shows a chisel hammer 1 as an example of a chiseling hand tool.
  • the chisel hammer 1 has a tool holder 2, which receives a chisel 3 and guided guided along a working axis 4 .
  • a striking mechanism 5 drives the chisel 3 along the working axis 4 in the direction of impact 6 into a base or a workpiece.
  • the striking mechanism 5 is driven by a motor 7, for example an electric motor.
  • An exemplary pneumatic percussion mechanism 5 has an exciter 8, which an eccentric 9 driven by the motor 7 periodically reciprocates along the working axis 4 .
  • a racket 10 is connected to the pathogen 8 via a pneumatic chamber 11 coupled and follows its movement delayed.
  • the racket 10 In the direction of impact 6 , the racket 10 abuts directly on a shank end 12 of the chisel 3 or indirectly via an intermediate racket 13 on the shank end 12.
  • the striking mechanism 5 is arranged in a machine housing 14 .
  • a user can guide the chisel hammer 1 by means of one or two handles 15 , which are rigidly or damply connected to the machine housing 14 .
  • a user can operate the chisel hammer 1 by operating a main switch 16.
  • Fig. 2 shows details of the tool holder 2 in a full section.
  • the exemplified tool holder 2 is designed to accommodate the chisel 3 or other tools with a prismatic shaft end 12 .
  • a receiving sleeve 20 has a cavity 21 into which the shaft end 12 can be inserted along the working axis 4 .
  • Three elongated holes 30 penetrate a radial wall 31 of the receiving sleeve 20.
  • a ball 32 or a differently designed locking element is inserted from radially outside. The balls 32 project partially into the cavity 21 and can engage in a locking groove of an inserted shaft end 12 and secure it in the tool holder 2 against falling out.
  • a locking sleeve 33 encloses the balls 32 in the radial direction and locks them on a disengagement from the cavity 21. Against a restoring force a spring 34 , the locking sleeve 33 can be moved, thereby opening a space adjacent to the ball 32 , in which the ball 32nd can escape from the cavity 21 to disengage.
  • a receiving sleeve 20 of the tool holder 2 is in a side view in Fig. 3 , in a longitudinal section in the level IV-IV in Fig. 4 and two cross sections in the plane VV in Fig. 5 and at level VI-VI in Fig. 6 ,
  • the receiving sleeve 20 has parallel to the working axis 4 inner surfaces 35 which define the prismatic cavity 21 .
  • a cross section of the cavity 21 is similar to the cross section of the male shaft end 12 of the bit 3 to be replicated.
  • the cavity 21 has a regular hexagonal cross-section.
  • the example six flat inner surfaces 35 abut the chisel 3 and secure this chisel 3 against rotation about the working axis 4.
  • a slight clearance between the shank end 12 and the inner surfaces 35 allows along the working axis 4 guided movement of the shank end 12 in the receiving sleeve 20 of the tool holder 2.
  • the prismatic cavity 21 has parallel to the working axis 4 edges 36, which may be rounded.
  • a length 37 of the cavity 21 along the working axis 4 is preferably at least three times greater than a diameter 38 of the cavity 21.
  • the cavity may also have a circular cross-section for receiving cylindrical shaft ends.
  • the receiving sleeve may in this case have in the cavity projecting pins or webs, which prevent rotation of the shaft end in the tool holder. It can also be exactly one or two slots provided.
  • a guide 39 for the intermediate beater 13 can join the prismatic cavity 21 along the working axis 4 .
  • the guide 39 expediently has a smaller diameter than the prismatic cavity 21 and can form a stop surface 40 against the direction of impact 6 for the shaft end 12 .
  • the receiving sleeve 20 is pierced by the one or more, in the illustrated example, three elongated holes 30 .
  • the elongated holes 30 open the cavity 21 in the radial direction, perpendicular to the working axis 4.
  • the elongated holes 30 are arranged along the working axis 4 spaced from a front end 41 and a rear end 42 of the cavity 21 and thus closed in both directions along the working axis 4 .
  • a distance from the front end 41 and the rear end 42 is greater than 50% of the length 37 of the cavity 21.
  • the three slots 30 may be arranged at different angular positions about the working axis 4 , in the illustrated example, the slots 30 are equidistant angles 43 provided rotated about the working axis 4 .
  • the elongated holes 30 are preferably arranged at the same height.
  • the slots 30 are arranged along the edges 36 of the cavity 21 .
  • Each of the oblong holes 30 is preferably arranged at an angular position corresponding to an edge 36 , so that the oblong holes 30 interrupt the respective edges 36 .
  • all slots 30 are the same, which is why only one slot 30 is described below by way of example.
  • the slot 30 has along the working axis 4 a larger dimension than along the surface of the receiving sleeve 20 in the circumferential direction 44 about the working axis 4, the difference is for example in the range of 0.5 cm to 3 cm.
  • the dimension in the circumferential direction 44 substantially corresponds to a diameter of the ball 32 to guide this, while the larger dimension along the working axis 4 of the ball 32 allows movement along the working axis 4 .
  • the elongated hole 30 has a central portion 45, which guides the locking body, for example the ball 32, during a movement along the working axis 4 .
  • Side surfaces 46 of the central portion 45 may be segments of a cylinder jacket, which parallel to a Trajectory of the ball 32, for example, parallel to the working axis 4, are aligned.
  • the slot 30 is closed in the direction of impact 6 by a front end piece 47 and opposite to the direction of impact 6 by a rear end piece 48 .
  • the front end piece 47 may have a plane perpendicular to the working axis 4 , flat surface 49 .
  • the ball 32 may abut only selectively at this surface 49 .
  • the following consideration of the geometry of the elongated hole 30 is limited to its edge 50 , neglecting a depth of the elongated hole 30 or a wall thickness 51 of the receiving sleeve 20.
  • the edge 50 is the shape of the elongated hole 30 on a radial outer surface 52 of the receiving sleeve 20.
  • a sectional plane 53 can be used by the receiving sleeve 20 , which is perpendicular to a radial direction 52 of the receiving sleeve 20 .
  • the cutting plane 53 is defined by the outermost circumferential direction 44 points to reflect the maximum dimension in the circumferential direction 44th In the cutting plane 53 are preferably the most projecting along the working axis 4 points of the locking body, such as the ball 32.
  • a nearly analogous description of the edge 50 utilizes a projection of the slot 30 on a cylindrical projection surface which is arranged concentrically to the working axis 4 .
  • the longitudinal sides 54 are rectilinear and oriented parallel to the working axis 4 .
  • the longitudinal sides 54 bound the slot 30 substantially in the circumferential direction 44.
  • the longitudinal sides 54 serve to guide the balls 32 along the working axis 4th
  • the front end side 55 touches the two pointing in the direction of impact 6 , front ends of the longitudinal sides 54, the rear end side 56 touches the two opposite to the direction of impact 6 facing rear ends of the longitudinal sides 54th
  • the end sides 56 close the slot 30 substantially along the working axis 4th from.
  • the End pages 56 have no semicircular shape.
  • the ball 32 contacts adjacent to the end face 55 only a center of the end face 56.
  • the end sides 56 are compressed compared to a connecting the longitudinal sides 54 semicircular end of the elongated hole 30 along the working axis 4 .
  • a dimension 58 of the end-sides 55 along the working axis 4 is smaller than half the distance 57 between the longitudinal sides 54.
  • the exemplary end side 55 has a along the circumferential direction 44 of straight section 59.
  • front end 71 of the longitudinal groove 70 is offset in the direction of impact 6 to the front end side 55 of the elongated hole 30 and a counter to the direction of impact 6 facing rear end 72 of the longitudinal groove 70 is opposite to the direction of impact 6 to the rear end side 56 of Long hole 30 offset.
  • the longitudinal groove 70 extends through the two end sides 55, 56.
  • the rear end 72 preferably extends from the rear end face 42 of the cavity 21 to the elongated hole 30.
  • the front end 71 is preferably clearly spaced from the front end face 41 of the cavity 21 .
  • a distance of the front end side 41 from the front end 71 is for example longer than the front end 71 itself, ie its dimension along the working axis 4.
  • the longitudinal groove 70 overlaps only with a closing side 55, 56 .
  • the longitudinal groove 70 thus consists only of a front end 71 or a rear end 72.
  • a width 74, ie dimension in the circumferential direction, of the longitudinal groove 70 corresponds, for example, to the length 60 of the rectilinear portion 59 of the end faces 55, 56.
  • a groove bottom 75 of the longitudinal groove 70 is preferably flat and perpendicular to a radial direction 76.
  • the radial direction 76 is related to the working axis 4 .
  • Angular dimension of the groove bottom 75 in the circumferential direction 44 is at least twice as large as an angular dimension of the rounded edge 36.
  • the edges 36 are formed only with a convex curvature, preferably with a single radius of curvature and tangentially into the adjacent flat inner surfaces 35 on.
  • the edges 36 lie completely within a prism having 36 linear edges instead of the rounded edges.
  • the longitudinal grooves 70 intersect the prism and are at least partially outside the prism.
  • a depth of the longitudinal grooves 70 is less than a wall thickness 51 of the wall 31 of the receiving sleeve 20 and is for example 5% to 50% of the wall thickness 51. The depth may for example be selected such that the groove bottom 75 is tangent to the edge 36 .
  • a distance 77 in the radial direction 76 of the edge 36 to the working axis 4 is equal to a distance 78 of the groove bottom 75 to the working axis 4th
  • the longitudinal grooves 70 are preferably formed by forming, for example extrusion, formed, alternatively produced by machining.
  • the elongated holes 30 can be milled by means of a milling head into the receiving sleeve 20 through the previously formed longitudinal grooves 70 .
  • FIGS. 7 and 8 show a receiving sleeve 20 with a further elongated hole 80.
  • the elongated hole 80 has a central section 81 with the working axis to 4 aligned parallel surfaces 82 for guiding the ball 32.
  • the surface 82 may be segments of a cylinder surface.
  • At the center piece 81 is followed in the direction of impact 6, a front end piece 83 and counter to the direction of impact 6, a rear end piece 84 at.
  • the front end portion 83 has a vertically aligned to the working axis 4 flat end surface 85.
  • An edge 86 of the elongated hole 80 on the outer surface 52 of the receiving sleeve 20 consists of two opposite longitudinal sides 87 formed through the cylindrical center section 81 and a front end side 88 and a rear end side 89 .
  • the front end side 88 is at least partially flattened and not semi-circular.
  • Fig. 9 shows a partial section parallel to the working axis 4 and through the slot 80.
  • a groove 90 is inserted into the wall 31 in the axial extension of the slot 80 .
  • the exemplary groove 90 has a front end 91, which projects beyond the slot 80 in the direction of impact 6 , and a rear end 92, which projects beyond the slot 80 against the direction of impact 6 .
  • a groove bottom 93 of the groove 90 is flat and perpendicular to the radial direction 76, that is tangent to a virtual to the working axis 4 coaxial cylinder.
  • the groove 90 extends along one of the edges 36.
  • a depth of the groove 90 ie, its dimension in the radial direction 76, is preferably selected so that a distance of the groove bottom 93 to the working axis 4 is equal to a distance of the edge 36 to the working axis 4 .
  • the groove 90 widens the rounded edge 36 in the circumferential direction 44 to a planar facet.
  • the groove 90 is shorter along the working axis 4 than the edge 36.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

The tool holder has a receiving sleeve (20) that includes a cylindrical or prismatic cavity (21) for receiving a machine tool along a working axis (4). An elongated hole (30) is formed in the receiving sleeve for receiving a locking element in parallel to the working axis. The grooves (71,72) are provided in an inner surface (35) of the receiving sleeve such that the holes in the inner surface of sleeve are prolonged along the working axis.

Description

GEBIET DER ERFINDUNGFIELD OF THE INVENTION

Die vorliegende Erfindung betrifft eine Werkzeugaufnahme, insbesondere für schlagende Werkzeugmaschinen, z.B. bohrmeißelnde Werkzeugmaschinen, welche per Hand geführt werden können.The present invention relates to a tool holder, in particular for beating machine tools, e.g. Drilling machine tools that can be guided by hand.

OFFENBARUNG DER ERFINDUNGDISCLOSURE OF THE INVENTION

Die erfindungsgemäße Werkzeugaufnahme hat eine Aufnahmehülse, die längs einer Arbeitsachse einen gerad-prismatischen oder zylindrischen Hohlraum zum Aufnehmen eines Werkzeugs und ein Langloch zum Aufnehmen eines Verriegelungskörpers aufweist. Eine parallel zur Arbeitsachse verlaufende Nut ist an einer Innenfläche der Aufnahmehülse vorgesehen. Die Nut ist das Langloch an der Innenfläche längs der Arbeitsachse verlängernd angeordnet. Die Aufnahmehülse erweist sich erstaunlicherweise trotz der lokal dünneren Wand als beständiger gegenüber den Schlagbelastungen ausgeübt durch schlagende Komponenten des Schlagwerks und des rückprallenden Werkzeugs.The tool holder according to the invention has a receiving sleeve which has along a working axis a straight-prismatic or cylindrical cavity for receiving a tool and a slot for receiving a locking body. A groove extending parallel to the working axis is provided on an inner surface of the receiving sleeve. The groove is arranged extending the slot on the inner surface along the working axis. The receiving sleeve proves surprisingly despite the locally thinner wall as resistant to the impact loads exerted by striking components of the percussion mechanism and the rebounding tool.

Das Langloch kann einen geschlossenen Rand gebildet aus zwei in konstantem Abstand gegenüberliegenden Längsseiten und zwei das Langloch längs der Arbeitsachse abschließender Abschlussseiten aufweisen. Das Langloch hat in einer Richtung, Längsrichtung genannt, seine größte Abmessung. Die Längsseiten sind zu der Längsrichtung parallel, z.B. auch parallel zu der Arbeitsachse, folglich in konstanten Abstand. Die anderen Abschnitte des Rands, welche nicht-parallel zu der Längsrichtung sind, sind den Abschlussseiten zugehörig. Der Übergang zwischen Längsseiten und Abschlussseiten ist durch eine Änderung der Neigung gegenüber der Arbeitsachse erkennbar, z.B. sind die Längsachsen parallel und daher nicht gegenüber über der Arbeitsachse geneigt, die Abschlussseiten hingegen sind über ihre gesamte Länge in unterschiedlichem Grad, bis zu senkrecht, gegenüber der Arbeitsachse geneigt. Die Nut hat eine offene Seite, die an eine der Abschlussseiten angrenzt.The oblong hole may have a closed edge made up of two longitudinal sides opposite one another at a constant distance and two end sides terminating the oblong hole along the working axis. The slot has in one direction, called the longitudinal direction, its largest dimension. The longitudinal sides are parallel to the longitudinal direction, e.g. also parallel to the working axis, thus at a constant distance. The other portions of the edge that are non-parallel to the longitudinal direction are associated with the termination pages. The transition between longitudinal sides and end faces can be recognized by a change in inclination relative to the working axis, e.g. the longitudinal axes are parallel and therefore not inclined relative to the working axis, the end sides, however, are inclined over their entire length in different degrees, up to vertical, relative to the working axis. The groove has an open side adjacent to one of the termination sides.

Eine Ausgestaltung sieht vor, dass ein Nutboden der Nut senkrecht zu einer bezogen auf die Arbeitsachse radialen Richtung ist.An embodiment provides that a groove bottom of the groove is perpendicular to a radial direction relative to the working axis.

Eine Ausgestaltung sieht vor, dass der Hohlraum mit mehreren zur Arbeitsachse parallel verlaufenden Kanten prismatisch ist, und jede der Längsnuten an einer einer der Kanten entsprechenden Winkelpositionen angeordnet ist. Die Längsnut längs der Arbeitsachse kann kürzer als die eine der Kanten sein. Die Nut verbreitert die Kante lokal in Umfangsrichtung.An embodiment provides that the cavity is prismatic with a plurality of parallel to the working axis edges, and each of the longitudinal grooves is arranged at one of the edges corresponding angular positions. The longitudinal groove along the working axis may be shorter than one of the edges. The groove widens the edge locally in the circumferential direction.

Eine Ausdehnung längs der Arbeitsachse wenigstens einer der Abschlussseiten kann geringer als die Hälfte des konstanten Abstands der gegenüberliegenden Längsseiten sein. Die wenigstens eine Abschlussseite ist gegenüber einem die Längsseiten verbindenden Halbkreis abgeflacht.An extent along the working axis of at least one of the termination sides may be less than half the constant distance of the opposite longitudinal sides. The at least one end side is flattened in relation to a semicircle connecting the longitudinal sides.

KURZE BESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

Die nachfolgende Beschreibung erläutert die Erfindung anhand von exemplarischen Ausführungsformen und Figuren. In den Figuren zeigen:

  • Fig. 1 einen Meißelhammer,
  • Fig. 2 eine Werkzeugaufnahme,
  • Fig. 3 bis Fig. 6 eine Aufnahmehülse,
  • Fig. 7 bis Fig. 9 eine weitere Aufnahmehülse.
The following description explains the invention with reference to exemplary embodiments and figures. In the figures show:
  • Fig. 1 a chisel hammer,
  • Fig. 2 a tool holder,
  • Fig. 3 to Fig. 6 a receiving sleeve,
  • FIGS. 7 to 9 another receiving sleeve.

Gleiche oder funktionsgleiche Elemente werden durch gleiche Bezugszeichen in den Figuren indiziert, soweit nicht anders angegeben.Identical or functionally identical elements are indicated by the same reference numerals in the figures, unless stated otherwise.

AUSFÃœHRUNGSFORMEN DER ERFINDUNGEMBODIMENTS OF THE INVENTION

Fig.1 1 zeigt schematisch einen Meißelhammer 1 als Beispiel für eine meißelnde Handwerkzeugmaschine. Der Meißelhammer 1 hat eine Werkzeugaufnahme 2, die einen Meißel 3 aufnimmt und längs einer Arbeitsachse 4 geführt lagert. Ein Schlagwerk 5 treibt den Meißel 3 längs der Arbeitsachse 4 in Schlagrichtung 6 in einen Untergrund oder ein Werkstück. Das Schlagwerk 5 wird durch einen Motor 7, z.B. einen Elektromotor, angetrieben. Ein beispielhaftes pneumatisches Schlagwerk 5 hat einen Erreger 8, den ein von dem Motor 7 angetriebener Exzenter 9 periodisch längs der Arbeitsachse 4 hin- und her bewegt. Ein Schläger 10 ist über eine pneumatische Kammer 11 an den Erreger 8 angekoppelt und folgt verzögert dessen Bewegung. In Schlagrichtung 6 stößt der Schläger 10 unmittelbar auf ein Schaftende 12 des Meißels 3 oder mittelbar über einen Zwischenschläger 13 auf das Schaftende 12. Das Schlagwerk 5 ist in einem Maschinengehäuse 14 angeordnet. Ein Anwender kann den Meißelhammer 1 mittels eines oder zweier Handgriffe 15 führen, welche starr oder gedämpft mit dem Maschinengehäuse 14 verbunden sind. Ein Anwender kann den Meißelhammer 1 durch Betätigen eines Hauptschalters 16 in Betrieb nehmen. Fig.1 1 schematically shows a chisel hammer 1 as an example of a chiseling hand tool. The chisel hammer 1 has a tool holder 2, which receives a chisel 3 and guided guided along a working axis 4 . A striking mechanism 5 drives the chisel 3 along the working axis 4 in the direction of impact 6 into a base or a workpiece. The striking mechanism 5 is driven by a motor 7, for example an electric motor. An exemplary pneumatic percussion mechanism 5 has an exciter 8, which an eccentric 9 driven by the motor 7 periodically reciprocates along the working axis 4 . A racket 10 is connected to the pathogen 8 via a pneumatic chamber 11 coupled and follows its movement delayed. In the direction of impact 6 , the racket 10 abuts directly on a shank end 12 of the chisel 3 or indirectly via an intermediate racket 13 on the shank end 12. The striking mechanism 5 is arranged in a machine housing 14 . A user can guide the chisel hammer 1 by means of one or two handles 15 , which are rigidly or damply connected to the machine housing 14 . A user can operate the chisel hammer 1 by operating a main switch 16.

Fig. 2 zeigt Details der Werkzeugaufnahme 2 in einem Vollschnitt. Die beispielhaft dargestellte Werkzeugaufnahme 2 ist zur Aufnahme für den Meißel 3 oder andere Werkzeuge mit einem prismatischen Schaftende 12 ausgelegt. Eine Aufnahmehülse 20 hat einen Hohlraum 21, in den das Schaftende 12 längs der Arbeitsachse 4 eingeschoben werden kann. Drei Langlöcher 30 durchbrechen eine radiale Wand 31 der Aufnahmehülse 20. In die Langlöcher 30 ist von radial Außen jeweils eine Kugel 32 oder ein anders gestaltetes Verriegelungselement eingesetzt. Die Kugeln 32 ragen teilweise in den Hohlraum 21 und können in eine Verriegelungsnut eines eingesetzten Schaftendes 12 eingreifen und dieses in der Werkzeugaufnahme 2 gegen ein Herausfallen sichern. Eine Verriegelungshülse 33 umschließt in radialer Richtung die Kugeln 32 und sperrt diese an einem Ausrücken aus dem Hohlraum 21. Gegen eine Rückstellkraft eine Feder 34 kann die Verriegelungshülse 33 verschoben werden, wodurch ein Freiraum angrenzend an die Kugel 32 geöffnet wird, in welchen die Kugel 32 zum Ausrücken aus dem Hohlraum 21 ausweichen kann. Fig. 2 shows details of the tool holder 2 in a full section. The exemplified tool holder 2 is designed to accommodate the chisel 3 or other tools with a prismatic shaft end 12 . A receiving sleeve 20 has a cavity 21 into which the shaft end 12 can be inserted along the working axis 4 . Three elongated holes 30 penetrate a radial wall 31 of the receiving sleeve 20. In the elongated holes 30 , a ball 32 or a differently designed locking element is inserted from radially outside. The balls 32 project partially into the cavity 21 and can engage in a locking groove of an inserted shaft end 12 and secure it in the tool holder 2 against falling out. A locking sleeve 33 encloses the balls 32 in the radial direction and locks them on a disengagement from the cavity 21. Against a restoring force a spring 34 , the locking sleeve 33 can be moved, thereby opening a space adjacent to the ball 32 , in which the ball 32nd can escape from the cavity 21 to disengage.

Eine Aufnahmehülse 20 der Werkzeugaufnahme 2 ist in einer Seitenansicht in Fig. 3, in einem Längsschnitt in der Ebene IV-IV in Fig. 4 und zwei Querschnitten in der Ebene V-V in Fig. 5 und in der Ebene VI-VI in Fig. 6.A receiving sleeve 20 of the tool holder 2 is in a side view in Fig. 3 , in a longitudinal section in the level IV-IV in Fig. 4 and two cross sections in the plane VV in Fig. 5 and at level VI-VI in Fig. 6 ,

Die Aufnahmehülse 20 hat zur Arbeitsachse 4 parallele Innenflächen 35, die den prismatischen Hohlraum 21 begrenzen. Ein Querschnitt des Hohlraums 21 ist dem Querschnitt des aufzunehmenden Schaftendes 12 des Meißels 3 ähnlich nachgebildet. In dem dargestellten Beispiel hat der Hohlraum 21 einen regelmäßig sechseckigen Querschnitt. Die beispielhaft sechs ebenen Innenflächen 35 liegen an dem Meißel 3 an und sichern diesen Meißel 3 gegen ein Drehen um die Arbeitsachse 4. Ein geringes Spiel zwischen dem Schaftende 12 und den Innenflächen 35 ermöglicht eine längs der Arbeitsachse 4 geführte Bewegung des Schaftendes 12 in der Aufnahmehülse 20 der Werkzeugaufnahme 2. Der prismatische Hohlraum 21 hat zur Arbeitsachse 4 parallele Kanten 36, welche abgerundet sein können. Eine Länge 37 des Hohlraums 21 längs der Arbeitsachse 4 ist vorzugsweise wenigstens dreimal größer als ein Durchmesser 38 des Hohlraums 21. The receiving sleeve 20 has parallel to the working axis 4 inner surfaces 35 which define the prismatic cavity 21 . A cross section of the cavity 21 is similar to the cross section of the male shaft end 12 of the bit 3 to be replicated. In the illustrated example, the cavity 21 has a regular hexagonal cross-section. The example six flat inner surfaces 35 abut the chisel 3 and secure this chisel 3 against rotation about the working axis 4. A slight clearance between the shank end 12 and the inner surfaces 35 allows along the working axis 4 guided movement of the shank end 12 in the receiving sleeve 20 of the tool holder 2. The prismatic cavity 21 has parallel to the working axis 4 edges 36, which may be rounded. A length 37 of the cavity 21 along the working axis 4 is preferably at least three times greater than a diameter 38 of the cavity 21.

Anstelle eines sechseckigen Querschnitts kann der Hohlraum auch eine kreisförmigen Querschnitt zur Aufnahme von zylindrischen Schaftenden aufweisen. Die Aufnahmehülse kann hierbei in den Hohlraum ragende Zapfen oder Stege aufweisen, welche ein Drehen des Schaftendes in der Werkzeugaufnahme unterbinden. Es können auch genau ein oder zwei Langlöcher vorgesehen sein.Instead of a hexagonal cross-section, the cavity may also have a circular cross-section for receiving cylindrical shaft ends. The receiving sleeve may in this case have in the cavity projecting pins or webs, which prevent rotation of the shaft end in the tool holder. It can also be exactly one or two slots provided.

An den prismatischen Hohlraum 21 kann sich längs der Arbeitsachse 4 eine Führung 39 für den Zwischenschläger 13 anschließen. Die Führung 39 hat zweckmäßigerweise einen geringeren Durchmesser als der prismatische Hohlraum 21 und kann für das Schaftende 12 eine Anschlagfläche 40 entgegen der Schlagrichtung 6 bilden.A guide 39 for the intermediate beater 13 can join the prismatic cavity 21 along the working axis 4 . The guide 39 expediently has a smaller diameter than the prismatic cavity 21 and can form a stop surface 40 against the direction of impact 6 for the shaft end 12 .

Die Aufnahmehülse 20 ist von den ein oder mehreren, in dem dargestellten Beispiel drei, Langlöchern 30 durchbrochen. Die Langlöcher 30 öffnen den Hohlraum 21 in radialer Richtung, senkrecht zur Arbeitsachse 4. Die Langlöcher 30 sind längs der Arbeitsachse 4 beabstandet von einer vorderer Stirnseite 41 und einer hinteren Stirnseite 42 des Hohlraums 21 angeordnet und somit in beide Richtungen längs der Arbeitsachse 4 geschlossen. Ein Abstand zu der vorderen Stirnseite 41 und der hinteren Stirnseite 42 ist größer als 50 % der Länge 37 des Hohlraums 21. Die drei Langlöcher 30 können an verschiedenen Winkelpositionen um die Arbeitsachse 4 angeordnet sein, in dem dargestellten Beispiel sind die Langlöcher 30 um äquidistante Winkel 43 um die Arbeitsachse 4 gedreht vorgesehen. Längs der Arbeitsachse 4 sind die Langlöcher 30 vorzugsweise auf gleicher Höhe angeordnet. Bei dem beispielhaft dargestellten prismatischen Hohlraum 21 sind die Langlöcher 30 entlang der Kanten 36 des Hohlraums 21 angeordnet. Jedes der Langlöcher 30 ist vorzugsweise an einer einer Kante 36 entsprechenden Winkelposition angeordnet, so dass die Langlöcher 30 die jeweiligen Kanten 36 unterbrechen.The receiving sleeve 20 is pierced by the one or more, in the illustrated example, three elongated holes 30 . The elongated holes 30 open the cavity 21 in the radial direction, perpendicular to the working axis 4. The elongated holes 30 are arranged along the working axis 4 spaced from a front end 41 and a rear end 42 of the cavity 21 and thus closed in both directions along the working axis 4 . A distance from the front end 41 and the rear end 42 is greater than 50% of the length 37 of the cavity 21. The three slots 30 may be arranged at different angular positions about the working axis 4 , in the illustrated example, the slots 30 are equidistant angles 43 provided rotated about the working axis 4 . Along the working axis 4 , the elongated holes 30 are preferably arranged at the same height. In the case of the exemplary prismatic cavity 21 , the slots 30 are arranged along the edges 36 of the cavity 21 . Each of the oblong holes 30 is preferably arranged at an angular position corresponding to an edge 36 , so that the oblong holes 30 interrupt the respective edges 36 .

Vorzugsweise sind alle Langlöcher 30 gleich ausgebildet, weshalb nachfolgend nur ein Langloch 30 exemplarisch beschrieben ist. Das Langloch 30 hat längs der Arbeitsachse 4 eine größere Abmessung als entlang der Oberfläche der Aufnahmehülse 20 in Umfangsrichtung 44 um die Arbeitsachse 4, der Unterschied liegt beispielsweise im Bereich von 0,5 cm bis 3 cm. Die Abmessung in Umfangsrichtung 44 entspricht im Wesentlichen einem Durchmesser der Kugel 32, um diese zu führen, während die größere Abmessung längs der Arbeitsachse 4 der Kugel 32 eine Bewegung längs der Arbeitsachse 4 ermöglicht. Das Langloch 30 hat einen mittleren Abschnitt 45, der den Verriegelungskörper, z.B. die Kugel 32, bei einer Bewegung längs der Arbeitsachse 4 führt. Seitenflächen 46 des mittleren Abschnitts 45 können Segmente eines Zylindermantels sein, welche parallel zu einer Bewegungsbahn der Kugel 32, z.B. parallel zu der Arbeitsachse 4, ausgerichtet sind. Das Langloch 30 ist in Schlagrichtung 6 durch ein vorderes Endstück 47 und entgegen der Schlagrichtung 6 durch ein hinteres Endstück 48 abgeschlossen. Das vordere Endstück 47 kann eine zur Arbeitsachse 4 senkrechte, ebene Fläche 49 aufweisen. Die Kugel 32 kann an dieser Fläche 49 nur punktuell anliegen.Preferably, all slots 30 are the same, which is why only one slot 30 is described below by way of example. The slot 30 has along the working axis 4 a larger dimension than along the surface of the receiving sleeve 20 in the circumferential direction 44 about the working axis 4, the difference is for example in the range of 0.5 cm to 3 cm. The dimension in the circumferential direction 44 substantially corresponds to a diameter of the ball 32 to guide this, while the larger dimension along the working axis 4 of the ball 32 allows movement along the working axis 4 . The elongated hole 30 has a central portion 45, which guides the locking body, for example the ball 32, during a movement along the working axis 4 . Side surfaces 46 of the central portion 45 may be segments of a cylinder jacket, which parallel to a Trajectory of the ball 32, for example, parallel to the working axis 4, are aligned. The slot 30 is closed in the direction of impact 6 by a front end piece 47 and opposite to the direction of impact 6 by a rear end piece 48 . The front end piece 47 may have a plane perpendicular to the working axis 4 , flat surface 49 . The ball 32 may abut only selectively at this surface 49 .

Die nachfolgenden Betrachtung der Geometrie des Langlochs 30 beschränkt sich auf dessen Rand 50 unter Vernachlässigung einer Tiefe des Langlochs 30 oder einer Wandstärke 51 der Aufnahmehülse 20. Der Rand 50 ist die Form des Langlochs 30 an einer radialen Außenfläche 52 der Aufnahmehülse 20. Für eine weitere Beschreibung des Randes 50 kann eine Schnittebene 53 durch die Aufnahmehülse 20 herangezogen werden, welche senkrecht zu einer radialen Richtung 52 der Aufnahmehülse 20 ist. Die Schnittebene 53 ist durch die in Umfangsrichtung 44 äußersten Punkte gelegt, um die maximale Abmessung in Umfangsrichtung 44 abzubilden. In der Schnittebene 53 liegen vorzugsweise die längs der Arbeitsachse 4 am weitesten vorstehenden Punkte des Verriegelungskörpers, z.B. der Kugel 32. Eine nahezu analoge Beschreibung des Randes 50 nutzt eine Projektion des Langlochs 30 auf eine zylindrische Projektionsfläche, welche konzentrisch zu der Arbeitsachse 4 angeordnet ist.The following consideration of the geometry of the elongated hole 30 is limited to its edge 50 , neglecting a depth of the elongated hole 30 or a wall thickness 51 of the receiving sleeve 20. The edge 50 is the shape of the elongated hole 30 on a radial outer surface 52 of the receiving sleeve 20. For another Description of the edge 50 , a sectional plane 53 can be used by the receiving sleeve 20 , which is perpendicular to a radial direction 52 of the receiving sleeve 20 . The cutting plane 53 is defined by the outermost circumferential direction 44 points to reflect the maximum dimension in the circumferential direction 44th In the cutting plane 53 are preferably the most projecting along the working axis 4 points of the locking body, such as the ball 32. A nearly analogous description of the edge 50 utilizes a projection of the slot 30 on a cylindrical projection surface which is arranged concentrically to the working axis 4 .

Der geschlossene Rand 50 des Langlochs 30 setzt sich vollständig aus zwei Längsseiten 54, einer vorderen Abschlussseite 55 und einer hinteren Abschlussseite 56 zusammen. Die Längsseiten 54 sind die Abschnitte des Randes 50, welche zueinander in einem in Umfangsrichtung 44 konstanten Abstand 57 angeordnet sind. Die gegenüberliegenden Längsseiten 54 sind in jedem Schnitt senkrecht zur Arbeitsachse 4 gleich weit voneinander entfernt. Bereiche des Randes 50, welche in einem Schnitt senkrecht zur Arbeitsachse 4 in einem anderen Abstand zueinander angeordnet sind, insbesondere einem geringeren Abstand, sind der vorderen Abschlussseite 55 oder der hinteren Abschlussseite 56 zugeordnet. Die Längsseiten 54 können Teile der zylindrischen Segmente des mittleren Abschnitts 45 sein. In der vorliegend dargestellten Ausführungsform sind die Längsseiten 54 geradlinig und parallel zu der Arbeitsachse 4 orientiert. Die Längsseiten 54 begrenzen das Langloch 30 im wesentlichen in Umfangsrichtung 44. Die Längsseiten 54 dienen der Führung der Kugeln 32 längs der Arbeitsachse 4. The closed edge 50 of the slot 30 is composed entirely of two longitudinal sides 54, a front end side 55 and a rear end side 56 together. The longitudinal sides 54 are the portions of the edge 50, which are arranged to each other in a circumferential direction 44 in the circumferential direction 57 . The opposite longitudinal sides 54 are in each section perpendicular to the working axis 4 equidistant from each other. Regions of the edge 50, which are arranged in a section perpendicular to the working axis 4 at a different distance from each other, in particular a smaller distance, are assigned to the front end side 55 or the rear end side 56 . The longitudinal sides 54 may be parts of the cylindrical segments of the central portion 45 . In the presently illustrated embodiment, the longitudinal sides 54 are rectilinear and oriented parallel to the working axis 4 . The longitudinal sides 54 bound the slot 30 substantially in the circumferential direction 44. The longitudinal sides 54 serve to guide the balls 32 along the working axis 4th

Die vordere Abschlussseite 55 berührt die beiden in Schlagrichtung 6 weisenden, vorderen Enden der Längsseiten 54, die hintere Abschlussseite 56 berührt die beiden entgegen die Schlagrichtung 6 weisenden, hinteren Enden der Längsseiten 54. Die Abschlussseiten 56 schließen das Langloch 30 im Wesentlichen längs der Arbeitsachse 4 ab. Die Abschlussseiten 56 haben keine halbkreisförmige Form. Die Kugel 32 berührt anliegend an der Abschlussseite 55 nur eine Mitte der Abschlussseite 56. Die Abschlussseiten 56 sind verglichen zu einem die Längsseiten 54 verbindenden halbkreisförmigen Abschluss des Langlochs 30 längs der Arbeitsachse 4 gestaucht. Eine Abmessung 58 der Abschlussseiten 55 längs der Arbeitsachse 4 ist geringer als die Hälfte des Abstands 57 zwischen den Längsseiten 54. Die beispielhafte Abschlussseite 55 hat einen längs der Umfangsrichtung 44 geradlinigen Abschnitt 59. Der geradlinige Abschnitt 59 verbindet die beiden gegenüberliegenden Längsseiten 54 auf die kürzeste Weise. Die Länge 60 des geradlinigen Abschnitts 59 kann wenigstens 60 %, z.B. wenigstens 80 % des Abstandes 57 zwischen den Längsseiten 54 entsprechen. Gebogene Abschnitte 61 der Abschlussseite 55 schließen den geradlinigen Abschnitt 59 an die Längsseiten 54 an.The front end side 55 touches the two pointing in the direction of impact 6 , front ends of the longitudinal sides 54, the rear end side 56 touches the two opposite to the direction of impact 6 facing rear ends of the longitudinal sides 54th The end sides 56 close the slot 30 substantially along the working axis 4th from. The End pages 56 have no semicircular shape. The ball 32 contacts adjacent to the end face 55 only a center of the end face 56. The end sides 56 are compressed compared to a connecting the longitudinal sides 54 semicircular end of the elongated hole 30 along the working axis 4 . A dimension 58 of the end-sides 55 along the working axis 4 is smaller than half the distance 57 between the longitudinal sides 54. The exemplary end side 55 has a along the circumferential direction 44 of straight section 59. The straight section 59 connecting the two opposite longitudinal sides 54 on the shortest Wise. The length 60 of the rectilinear portion 59 may be at least 60%, eg, at least 80% of the distance 57 between the longitudinal sides 54 . Curved portions 61 of the closing side 55 connect the rectilinear portion 59 to the longitudinal sides 54 .

An den Innenflächen 35 der Aufnahmehülse 20 können Längsnuten 70 vorgesehen sein, die in gleichen Winkelpositionen um die Arbeitsachse 4 wie die Langlöcher 30 angeordnet sind und parallel zur Arbeitsachse 4 verlaufen. Jede der Längsnuten 60 ist an einer einer Kante 36 entsprechenden Winkelpositionen angeordnet. Die Anzahl der Längsnuten 60 stimmt mit der Anzahl der Langlöcher 30 überein, welche größer als die Zahl der Kanten 36 des prismatischen Hohlraums sein können. Die Längsnut 70 kann längs der Arbeitsachse 4 in beide Richtung über das Langloch 30 hinausragen. Die Längsnuten 70 verlaufen durch die Langlöcher 30, und sind somit durch die Langlöcher 30 unterbrochen. Ein in Schlagrichtung 6 weisendes, vorderes Ende 71 der Längsnut 70 ist in Schlagrichtung 6 zu der vorderen Abschlussseite 55 des Langlochs 30 versetzt und ein entgegen der Schlagrichtung 6 weisendes, hinteres Ende 72 der Längsnut 70 ist entgegen der Schlagrichtung 6 zu der hinteren Abschlussseite 56 des Langlochs 30 versetzt. Die Längsnut 70 verläuft durch die beiden Abschlussseiten 55, 56. Das hintere Ende 72 reicht vorzugsweise von der hinteren Stirnseite 42 des Hohlraums 21 bis zu dem Langloch 30. Das vordere Ende 71 ist vorzugsweise von der vorderen Stirnseite 41 des Hohlraums 21 deutlich beabstandet. Ein Abstand der vorderen Stirnseite 41 von dem vorderen Ende 71 ist beispielsweise länger als das vordere Ende 71 selbst, d.h. seine Abmessung längs der Arbeitsachse 4. Eine andere Ausführungsform sieht vor, dass die Längsnut 70 nur mit einer Abschlussseite 55, 56 überlappt. Die Längsnut 70 besteht somit nur aus einem vorderen Ende 71 oder einem hinteren Ende 72. Eine offene Seite 73 der Längsnut 71, 72 grenzt an die Abschlussseite 55, 56 an. Eine Breite 74, d.h. Abmessung in Umfangsrichtung, der Längsnut 70 entspricht beispielsweise der Länge 60 des geradlinigen Abschnitts 59 der Abschlussseiten 55, 56. On the inner surfaces 35 of the receiving sleeve 20 longitudinal grooves 70 may be provided, which are arranged in the same angular positions about the working axis 4 as the slots 30 and parallel to the working axis 4 . Each of the longitudinal grooves 60 is disposed at an angular position corresponding to an edge 36 . The number of longitudinal grooves 60 coincides with the number of elongated holes 30 , which may be greater than the number of edges 36 of the prismatic cavity. The longitudinal groove 70 may protrude along the working axis 4 in both directions over the slot 30 . The longitudinal grooves 70 extend through the elongated holes 30, and are thus interrupted by the elongated holes 30 . A pointing in the direction of impact 6 , front end 71 of the longitudinal groove 70 is offset in the direction of impact 6 to the front end side 55 of the elongated hole 30 and a counter to the direction of impact 6 facing rear end 72 of the longitudinal groove 70 is opposite to the direction of impact 6 to the rear end side 56 of Long hole 30 offset. The longitudinal groove 70 extends through the two end sides 55, 56. The rear end 72 preferably extends from the rear end face 42 of the cavity 21 to the elongated hole 30. The front end 71 is preferably clearly spaced from the front end face 41 of the cavity 21 . A distance of the front end side 41 from the front end 71 is for example longer than the front end 71 itself, ie its dimension along the working axis 4. Another embodiment provides that the longitudinal groove 70 overlaps only with a closing side 55, 56 . The longitudinal groove 70 thus consists only of a front end 71 or a rear end 72. An open side 73 of the longitudinal groove 71, 72 adjacent to the end face 55, 56 at. A width 74, ie dimension in the circumferential direction, of the longitudinal groove 70 corresponds, for example, to the length 60 of the rectilinear portion 59 of the end faces 55, 56.

Ein Nutboden 75 der Längsnut 70 ist vorzugsweise eben und senkrecht zu einer radialen Richtung 76. Die radiale Richtung 76 ist auf die Arbeitsachse 4 bezogen. EineA groove bottom 75 of the longitudinal groove 70 is preferably flat and perpendicular to a radial direction 76. The radial direction 76 is related to the working axis 4 . A

Winkelabmessung des Nutbodens 75 in Umfangsrichtung 44 ist wenigstens doppelt so groß wie eine Winkelabmessung der gerundeten Kante 36. Die Kanten 36 sind nur mit einer konvexen Krümmung ausgebildet, vorzugsweise mit einem einzigen Krümmungsradius und gehen tangential in die benachbarten ebenen Innenflächen 35 über. Die Kanten 36 liegen vollständig innerhalb eines Prismas, das anstelle der gerundeten Kanten 36 linienförmige Kanten aufweist. Die Längsnuten 70 schneiden das Prisma und liegen wenigstens teilweise außerhalb des Prismas. Eine Tiefe der Längsnuten 70 ist geringer als eine Wandstärke 51 der Wand 31 der Aufnahmehülse 20 und beträgt beispielsweise 5 % bis 50 % der Wandstärke 51. Die Tiefe kann beispielsweise derart gewählt sein, der Nutboden 75 tangential zu der Kante 36 ist. Ein Abstand 77 in radialer Richtung 76 der Kante 36 zu der Arbeitsachse 4 ist gleich einem Abstand 78 des Nutbodens 75 zu der Arbeitsachse 4. Angular dimension of the groove bottom 75 in the circumferential direction 44 is at least twice as large as an angular dimension of the rounded edge 36. The edges 36 are formed only with a convex curvature, preferably with a single radius of curvature and tangentially into the adjacent flat inner surfaces 35 on. The edges 36 lie completely within a prism having 36 linear edges instead of the rounded edges. The longitudinal grooves 70 intersect the prism and are at least partially outside the prism. A depth of the longitudinal grooves 70 is less than a wall thickness 51 of the wall 31 of the receiving sleeve 20 and is for example 5% to 50% of the wall thickness 51. The depth may for example be selected such that the groove bottom 75 is tangent to the edge 36 . A distance 77 in the radial direction 76 of the edge 36 to the working axis 4 is equal to a distance 78 of the groove bottom 75 to the working axis 4th

Die Längsnuten 70 werden vorzugsweise durch Umformen, z.B. Fließpressen, ausgebildet, alternativ spanend hergestellt. Die Langlöcher 30 können mittels eines Fräskopfes in die Aufnahmehülse 20 durch die zuvor geformten Längsnuten 70 gefräst werden.The longitudinal grooves 70 are preferably formed by forming, for example extrusion, formed, alternatively produced by machining. The elongated holes 30 can be milled by means of a milling head into the receiving sleeve 20 through the previously formed longitudinal grooves 70 .

Fig. 7 und Fig. 8 zeigen eine Aufnahmehülse 20 mit einem weiteren Langloch 80. Das Langloch 80 hat einen mittleren Abschnitt 81 mit zu der Arbeitsachse 4 parallel ausgerichteten Flächen 82 zum Führen der Kugel 32. Die Flächen 82 können Segmente einer Zylindermantelfläche sein. An das Mittelstück 81 schließt sich in Schlagrichtung 6 ein vorderes Endstück 83 und entgegen der Schlagrichtung 6 ein hinteres Endstück 84 an. Das vordere Endstück 83 hat eine zur Arbeitsachse 4 senkrecht ausgerichtete ebene Stirnfläche 85. Ein Rand 86 des Langlochs 80 an der Außenfläche 52 des Aufnahmehülse 20 besteht aus zwei gegenüberliegenden Längsseiten 87 gebildet durch das zylindrische Mittelstück 81 und einer vorderen Abschlussseite 88 und einer hinteren Abschlussseite 89. Die vordere Abschlussseite 88 ist zumindest abschnittsweise abgeflacht und nicht halbkreisförmig. FIGS. 7 and 8 show a receiving sleeve 20 with a further elongated hole 80. The elongated hole 80 has a central section 81 with the working axis to 4 aligned parallel surfaces 82 for guiding the ball 32. The surface 82 may be segments of a cylinder surface. At the center piece 81 is followed in the direction of impact 6, a front end piece 83 and counter to the direction of impact 6, a rear end piece 84 at. The front end portion 83 has a vertically aligned to the working axis 4 flat end surface 85. An edge 86 of the elongated hole 80 on the outer surface 52 of the receiving sleeve 20 consists of two opposite longitudinal sides 87 formed through the cylindrical center section 81 and a front end side 88 and a rear end side 89 . The front end side 88 is at least partially flattened and not semi-circular.

Fig. 9 zeigt einen Teilschnitt parallel zu der Arbeitsachse 4 und durch das Langloch 80. Eine Nut 90 ist in die Wand 31 in axialer Verlängerung zu dem Langloch 80 eingebracht. Die beispielhafte Nut 90 hat einen vorderes Ende 91, welches über das Langloch 80 in Schlagrichtung 6 hinausragt, und ein hinteres Ende 92, welches über das Langloch 80 entgegen der Schlagrichtung 6 hinausragt. Ein Nutboden 93 der Nut 90 ist eben und senkrecht zu der radialen Richtung 76, d.h. tangential zu einem zu der Arbeitsachse 4 virtuellen koaxialem Zylinder. Fig. 9 shows a partial section parallel to the working axis 4 and through the slot 80. A groove 90 is inserted into the wall 31 in the axial extension of the slot 80 . The exemplary groove 90 has a front end 91, which projects beyond the slot 80 in the direction of impact 6 , and a rear end 92, which projects beyond the slot 80 against the direction of impact 6 . A groove bottom 93 of the groove 90 is flat and perpendicular to the radial direction 76, that is tangent to a virtual to the working axis 4 coaxial cylinder.

Die Nut 90 verläuft entlang einer der Kanten 36. Eine Tiefe der Nut 90, d.h. ihre Abmessung in radialer Richtung 76, ist vorzugsweise so gewählt, dass ein Abstand des Nutbodens 93 zu der Arbeitsachse 4 gleich einem Abstand der Kante 36 zu der Arbeitsachse 4 ist. Die Nut 90 verbreitert die gerundete Kante 36 in Umfangsrichtung 44 zu einer ebenen Facette. Die Nut 90 ist längs der Arbeitsachse 4 kürzer als die Kante 36. The groove 90 extends along one of the edges 36. A depth of the groove 90, ie, its dimension in the radial direction 76, is preferably selected so that a distance of the groove bottom 93 to the working axis 4 is equal to a distance of the edge 36 to the working axis 4 . The groove 90 widens the rounded edge 36 in the circumferential direction 44 to a planar facet. The groove 90 is shorter along the working axis 4 than the edge 36.

Claims (6)

Werkzeugaufnahme für eine schlagende Werkzeugmaschine mit einer Aufnahmehülse (20), die längs einer Arbeitsachse (4) einen zylindrischen oder prismatischen Hohlraum (21) zum Aufnehmen eines Werkzeugs, ein Langloch (30, 80) zum Aufnehmen eines Verriegelungskörpers aufweist, und eine parallel zur Arbeitsachse (4) verlaufende Nut (71, 72) an einer Innenfläche (35) der Aufnahmehülse (20) vorgesehen ist, welche das Langloch (30, 80) an der Innenfläche (35) längs der Arbeitsachse (4) verlängernd angeordnet ist.Tool holder for a beating machine tool having a receiving sleeve (20) along a working axis (4) has a cylindrical or prismatic cavity (21) for receiving a tool, a slot (30, 80) for receiving a locking body, and one parallel to the working axis (4) extending groove (71, 72) on an inner surface (35) of the receiving sleeve (20) is provided, which is the elongated hole (30, 80) on the inner surface (35) extending along the working axis (4). Werkzeugaufnahme nach Anspruch 1, dadurch gekennzeichnet, dass das Langloch (30, 80) einen geschlossenen Rand (50, 86) gebildet aus zwei in konstantem Abstand gegenüberliegenden Längsseiten (54, 87) und zwei das Langloch (30, 80) längs der Arbeitsachse (4) abschließenden Abschlussseiten (55, 56, 88, 89) hat, und eine offene Seite der Nut (71, 72) an eine der Abschlussseiten (55, 56, 88, 89) angrenzt.Tool holder according to claim 1, characterized in that the oblong hole (30, 80) has a closed edge (50, 86) formed from two longitudinally opposite longitudinal sides (54, 87) and two the slot (30, 80) along the working axis ( 4) has final closure sides (55, 56, 88, 89) and an open side of the groove (71, 72) adjacent one of the end faces (55, 56, 88, 89). Werkzeugaufnahme nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein Nutboden (75) der Nut (70) senkrecht zu einer bezogen auf die Arbeitsachse (4) radialen Richtung (76) ist.Tool holder according to claim 1 or 2, characterized in that a groove bottom (75) of the groove (70) perpendicular to a relative to the working axis (4) radial direction (76). Werkzeugaufnahme nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Hohlraum mit mehreren zur Arbeitsachse (4) parallel verlaufenden Kanten prismatisch ist, und jede der Längsnuten (60) an einer einer der Kanten (36) entsprechenden Winkelpositionen angeordnet ist.Tool holder according to one of the preceding claims, characterized in that the cavity with several to the working axis (4) parallel edges is prismatic, and each of the longitudinal grooves (60) is arranged at one of the edges (36) corresponding angular positions. Werkzeugaufnahme nach Anspruch 4, dadurch gekennzeichnet, dass die Längsnut (60) längs der Arbeitsachse (4) kürzer als die eine der Kanten (36) ist.Tool holder according to claim 4, characterized in that the longitudinal groove (60) along the working axis (4) is shorter than the one of the edges (36). Werkzeugaufnahme nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Nut (94) in Umfangsrichtung (44) verbreitert.Tool holder according to claim 4 or 5, characterized in that the groove (94) widened in the circumferential direction (44).
EP12153455.6A 2011-02-23 2012-02-01 Tool holder Active EP2492054B1 (en)

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Publication number Priority date Publication date Assignee Title
EP2845687A1 (en) * 2013-09-04 2015-03-11 HILTI Aktiengesellschaft Power tool
EP3081340A1 (en) * 2015-04-13 2016-10-19 HILTI Aktiengesellschaft Power tool

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Publication number Priority date Publication date Assignee Title
EP3978195A1 (en) * 2020-09-30 2022-04-06 Hilti Aktiengesellschaft Chisel and tool holder

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1293303A1 (en) 2001-09-12 2003-03-19 Black & Decker Inc. Tool holder for hammer
DE102006016804A1 (en) 2006-04-10 2007-10-11 Robert Bosch Gmbh Tool holder for a hammer drill

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3843465A1 (en) * 1988-12-23 1990-06-28 Bosch Gmbh Robert Device for clamping tools

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1293303A1 (en) 2001-09-12 2003-03-19 Black & Decker Inc. Tool holder for hammer
DE102006016804A1 (en) 2006-04-10 2007-10-11 Robert Bosch Gmbh Tool holder for a hammer drill

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2845687A1 (en) * 2013-09-04 2015-03-11 HILTI Aktiengesellschaft Power tool
EP3081340A1 (en) * 2015-04-13 2016-10-19 HILTI Aktiengesellschaft Power tool

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EP2492054B1 (en) 2016-05-18

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