EP2532486A1 - Tool holder - Google Patents

Tool holder Download PDF

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Publication number
EP2532486A1
EP2532486A1 EP12168787A EP12168787A EP2532486A1 EP 2532486 A1 EP2532486 A1 EP 2532486A1 EP 12168787 A EP12168787 A EP 12168787A EP 12168787 A EP12168787 A EP 12168787A EP 2532486 A1 EP2532486 A1 EP 2532486A1
Authority
EP
European Patent Office
Prior art keywords
spring
tool holder
receiving space
slide
radial
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
EP12168787A
Other languages
German (de)
French (fr)
Other versions
EP2532486B1 (en
Inventor
Aaron Wiedner
Markus Hartmann
Udo Hauptmann
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 EP2532486A1 publication Critical patent/EP2532486A1/en
Application granted granted Critical
Publication of EP2532486B1 publication Critical patent/EP2532486B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084—Rotating chucks or sockets
    • B25D17/088—Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0038—Locking members of special shape
    • B25D2217/0042—Ball-shaped locking members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/371—Use of springs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S279/00—Chucks or sockets
    • Y10S279/904—Quick change socket
    • Y10S279/905—Quick change socket with ball detent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17042—Lost motion
    • Y10T279/17076—Spreading elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17128—Self-grasping
    • Y10T279/17136—Yielding grasping jaws
    • Y10T279/17145—Ball or roller
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17761—Side detent

Definitions

  • the present invention relates to a tool holder, in particular for a chiseling, purely chiseling and / or drill-drilling machine tool.
  • the tool holder is designed in particular for chiselling and turning tools which have an elongated locking groove on the shaft end.
  • the tool holder according to the invention has a spindle which has a working axis oriented along an output side open, cylindrical or prismatic receiving space for receiving a tool in the insertion direction and a piercing into the receiving space in the radial direction slot.
  • the spindle can be permanently or detachably connected to a drive of a hand-held power tool, eg a hammer drill.
  • a blocking body for example a ball, protrudes into the slot in the receiving space and is movable between a driven-side end of the slot and a drive-side end of the slot.
  • the number of elongated holes and locking body is not limited to exactly one, it can also be provided a plurality of slots, in each of which exactly one locking body are arranged.
  • a slider is used to push the locking body to the output side end of the slot, wherein the slider is overlapped in the radial direction with the locking body and is acted upon by a first spring against the insertion direction.
  • a radial stop forces the locking body against it in the radial direction to engage in the receiving space.
  • the radial stopper overlaps in a locking position with the driven side end of the slot, whereby the locking body located in the driven side end is prevented from radial movement, and the radial stop is against the insertion direction against the spring force of the first spring for releasing a radial movement of the locking body from the engagement with the receiving space displaceable.
  • a second spring is supported in the insertion direction on the slide and acts on the radial stop against the insertion direction with a spring force.
  • the radial stop overlaps in the basic position in the axial direction with the locking body, whereby the locking body is held engaging in the basic position in the receiving space.
  • the basic position corresponds to a locking position of the tool holder.
  • a user can move the radial stop against the first spring to the drive-side end, after which the blocking body can emerge completely in the radial direction from the receiving space. A lying in the tool holder tool is released by this.
  • the second spring facilitates insertion of the tool when the tool holder is held vertically.
  • the second spring holds the radial stop without actuation of the user overlapping with the output side end of the slot.
  • the user moves when inserting the tool, the locking body including the slider towards the drive end. At the drive end, the locking body can freely deflect radially through the radial stop and release the receiving space.
  • the two springs may be disposed on opposite sides of the slider.
  • Fig. 1 schematically shows a hammer drill 1 as an example of a chiseling hand tool .
  • the hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool, for example one of the drill bit 4, can be used.
  • a primary drive of the hammer drill 1 is a motor 5, which drives a striking mechanism 6 and an output shaft 7 .
  • a user can guide the hammer drill 1 by means of a handle 8 and take means of a system switch 9, the hammer drill 1 is in operation.
  • the hammer drill 1 rotates the drill bit 4 continuously about a working axis 10 and can beat the drill bit 4 in the direction of impact 11 along the working axis 10 in a substrate.
  • the percussion 6 is, for example, a pneumatic percussion 6.
  • a pathogen 12 and a racket 13 are guided in the percussion 6 along the working axis 10 movable.
  • the exciter 12 is coupled via an eccentric 14 or a wobble finger to the motor 5 and forced to a periodic, linear movement.
  • An air spring formed by a pneumatic chamber 15 between exciter 12 and racket 13 couples a movement of the racket 13 to the movement of the exciter 12 at.
  • the racket 13 can strike directly on a rear end of the drill bit 4 or indirectly transfer part of its pulse to the drill bit 4 via a substantially resting intermediate racket 16 .
  • the striking mechanism 6 and preferably the further drive components are arranged within a machine housing 17 .
  • Fig. 2 shows an exemplary embodiment of the tool holder 2.
  • the tool holder 2 has a driven by the output shaft 7 hollow spindle 20 with a receiving space 21 for the tool 4.
  • the tool 4 can through an output-side opening 22 in the insertion direction 23 (opposite to the direction of impact 11) in the Recording room 21 are used.
  • the receiving space 21 is preferably complementary to the shaft end 3, for example cylindrical.
  • the balls 24 are inserted into slots 25 in a wall 26 of the hollow spindle 20 .
  • a radial inhibition of the balls 24 takes place by a locking ring 27, on which the balls 24 partially project from the radially inner side into the receiving space 21 .
  • the projecting into the receiving space 21 part of the balls 24 can engage in the locking groove of the tool 4 .
  • a spring-loaded slider 28 holds the balls 24 within the locking ring 27, ie, overlapping axially with the locking ring 27 . When inserting the tool 24 , the balls are moved against the spring-loaded slide 28 and get out of engagement with the locking ring 27.
  • the balls 24 can dodge radially and release the receiving space 21 .
  • the locking ring 27 can be moved by an actuating sleeve 29 against the spring-loaded slide 28 , whereby the radial inhibition of the balls 24 is released and an inserted tool can be removed.
  • the exemplary spindle 20 has two opposite slots 25 in its shell-shaped wall 26.
  • the slots 25 are aligned parallel to the working axis 10 , a distance of a driven-side end 30 of a drive-side end 31 is preferably greater than a width of the slots 25.
  • a distance of a driven-side end 30 of a drive-side end 31 is preferably greater than a width of the slots 25.
  • one of the balls 24 is inserted.
  • a diameter of the balls 24 is greater than a wall thickness of the spindle 20, whereby the balls 24 partially project into the receiving space 21 and partially protrude beyond the spindle 20 .
  • balls, rollers, rollers, etc. can be used as a blocking body.
  • the locking ring 27 has a radially inwardly facing stop surface 32.
  • the stop surface 32 is preferably cylindrical.
  • a radial distance of the stop surface of the working axis 10 is dimensioned such that the balls 24, the stop surface 32 in contact with the receiving space 21 protrude.
  • An axial dimension of the abutment surface 32 is less than a length of the elongated holes 25 whose distance from the output side end 30 to the drive side end 31.
  • the stop surface 32 and the output side end 30 of the elongated hole 25 overlap along the working axis 10 at a locking position of the locking ring 27, which is also the basic position. In the basic position, there is no axial overlap of the abutment surface 32 with the drive end 31 of the slot 25.
  • For an unlocking position of the locking ring 27 is offset axially relative to the output end 30 at least so far that the balls 24 radially escape completely from the receiving space 21 .
  • the exemplary locking ring 27 is material and / or positively connected to the actuating sleeve 29 .
  • the actuating sleeve 29 has a freely accessible outer surface on which the user can grasp it.
  • the actuating sleeve 29 including the locking ring 27 are displaceable by a user from a basic position to the unlocking position.
  • the slider 28 is arranged on the drive side of the balls 24 .
  • the exemplary slider 28 is an annular disc which is slid onto the spindle 20 .
  • the slider 28 is along the working axis 10 relative to the spindle 20, the balls 24 and the locking ring 27 axially movable.
  • the balls 24 and the slider 28 overlap in the radial direction 33, whereby the slider 28 can abut the drive side 24 on the balls.
  • a first spring 34 acts in the direction of impact 11 on the slider 28.
  • the loaded by the first spring 34 slider 28 holds the balls 24 at or near the output side end 30 of the slot 25, whereby the balls 24 are in engagement with the radial stop surface 32 .
  • the locking ring 27 or the actuating sleeve 29 form a driven-side stop for the slider 28, whereby the first spring 34 can act indirectly on the locking ring 27 .
  • the actuating sleeve 29 counteracts the first spring 34 when moving from the basic position to the unlocking position.
  • a second spring 35 is biased between the actuating sleeve 29 and the slider 28 .
  • the second spring 35 contacts the opposite the locking ring 27 axially movable slide 28.
  • the slider 28 solubilisation of the locking ring 27 and the actuating sleeve 29.
  • the second spring 35 acts on the locking ring 27 in the direction of impact 11 and thus holds the locking ring 27 in its normal position near the output-side end 30 of the elongated hole 25th
  • the actuating sleeve 29 has an axial first drive-side contact surface 36 on which the slider 28 rests in the basic position. Along the working axis 10, offset in the direction of impact 11 to the first contact surface 36 , a second drive-side contact surface 37 is provided. The second spring 35 is applied to this second abutment surface 37 .
  • the two springs 34, 35 may be formed, for example, as coil springs.
  • the first spring 34 exerts a greater force on the slider 28 than the second spring 35 .
  • Fig. 3 shows a modification of the tool holder 2, in which the second spring 35 ' and the second bearing surface 37' are varied.
  • the actuating sleeve 29 has a pocket 38, the axial end of the second bearing surface 37 'is formed and in which the second spring 35' is arranged.

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

Abstract

The retainer (2) has a ball (24) protruding into an elongated hole (25) lying in a receiving area (21) of a hollow spindle (20). A spring-loaded slider (28) is subjected to force by a spring (34) against an insertion direction (23). A locking ring (27) forces the ball to engage in the area in a radial direction (33), and is displaced against spring force for enabling a radial movement of the ball out of engagement with the area. Another spring (35) is supported at the slider in the insertion direction. The ring is subjected to force by the latter spring against the insertion direction.

Description

GEBIET DER ERFINDUNGFIELD OF THE INVENTION

Die vorliegende Erfindung betrifft eine Werkzeugaufnahme, insbesondere für eine meißelnde, rein meißelnde und/oder bohrmeißelnde Werkzeugmaschine. Die Werkzeugaufnahme ist insbesondere für meißelnde und drehmeißelnde Werkzeuge ausgelegt, die eine längliche Verriegelungsnut am Schaftende aufweisen.The present invention relates to a tool holder, in particular for a chiseling, purely chiseling and / or drill-drilling machine tool. The tool holder is designed in particular for chiselling and turning tools which have an elongated locking groove on the shaft end.

OFFENBARUNG DER ERFINDUNGDISCLOSURE OF THE INVENTION

Die erfindungsgemäße Werkzeugaufnahme hat eine Spindel, die einen längs einer Arbeitsachse orientierten, abtriebsseitig offenen, zylindrischen oder prismatischen Aufnahmeraum zum Aufnehmen eines Werkzeugs in Einsetzrichtung und ein in den Aufnahmeraum in radialer Richtung einstechendes Langloch hat. Die Spindel kann unlösbar oder lösbar mit einem Antrieb einer Handwerkzeugmaschine, z.B. einem Bohrhammer verbunden sein. Ein Sperrkörper, z.B. eine Kugel, ragt in dem Langloch liegend in den Aufnahmeraum hinein und ist zwischen einem abtriebsseitigen Ende des Langlochs und einem antriebsseitigen Ende des Langlochs beweglich. Die Zahl der Langlöcher und Sperrkörper ist nicht auf genau eines beschränkt, es können auch mehrere Langlöcher vorgesehen sein, in welchen jeweils genau ein Sperrkörper angeordnet sind. Ein Schieber dient zum Schieben des Sperrkörpers zu dem abtriebsseitigen Ende des Langlochs, wobei der Schieber in radialer Richtung mit dem Sperrkörper überlappt und durch eine erste Feder entgegen der Einsetzrichtung kraftbeaufschlagt ist. Ein radialer Anschlag zwingt an ihm in radialer Richtung anliegend den Sperrkörper zum Eingreifen in den Aufnahmeraum. Der radiale Anschlag überlappt in einer verriegelnden Stellung mit dem abtriebsseitigen Ende des Langlochs, wodurch der in dem abtriebsseitigen Ende liegende Sperrkörper an einer radialen Bewegung gehindert ist, und der radiale Anschlag ist entgegen der Einsetzrichtung, gegen die Federkraft der ersten Feder zum Freigeben einer radialen Bewegung des Sperrkörpers aus dem Eingriff mit dem Aufnahmeraum verschiebbar. Eine zweite Feder ist in Einsetzrichtung an dem Schieber abgestützt und beaufschlagt den radialen Anschlag entgegen der Einsetzrichtung mit einer Federkraft.The tool holder according to the invention has a spindle which has a working axis oriented along an output side open, cylindrical or prismatic receiving space for receiving a tool in the insertion direction and a piercing into the receiving space in the radial direction slot. The spindle can be permanently or detachably connected to a drive of a hand-held power tool, eg a hammer drill. A blocking body, for example a ball, protrudes into the slot in the receiving space and is movable between a driven-side end of the slot and a drive-side end of the slot. The number of elongated holes and locking body is not limited to exactly one, it can also be provided a plurality of slots, in each of which exactly one locking body are arranged. A slider is used to push the locking body to the output side end of the slot, wherein the slider is overlapped in the radial direction with the locking body and is acted upon by a first spring against the insertion direction. A radial stop forces the locking body against it in the radial direction to engage in the receiving space. The radial stopper overlaps in a locking position with the driven side end of the slot, whereby the locking body located in the driven side end is prevented from radial movement, and the radial stop is against the insertion direction against the spring force of the first spring for releasing a radial movement of the locking body from the engagement with the receiving space displaceable. A second spring is supported in the insertion direction on the slide and acts on the radial stop against the insertion direction with a spring force.

In der Grundstellung ist der Sperrkörper durch den Schieber am abtriebsseitigen Ende des Langlochs gehalten. Der radiale Anschlag überlappt in der Grundstellung in axialer Richtung mit dem Sperrkörper, wodurch der Sperrkörper in der Grundstellung in den Aufnahmeraum eingreifend gehalten ist. Die Grundstellung entspricht einer verriegelnden Stellung der Werkzeugaufnahme. Ein Anwender kann den radialen Anschlag gegen die erste Feder zu dem antriebsseitigen Ende verschieben, worauf der Sperrkörper in radialer Richtung aus dem Aufnahmeraum vollständig heraustreten kann. Ein in der Werkzeugaufnahme liegendes Werkzeug wird hierdurch freigegeben. Die zweite Feder erleichtert das Einsetzen des Werkzeugs, wenn die Werkzeugaufnahme vertikal gehalten ist. Die zweite Feder hält den radialen Anschlag ohne Betätigung des Anwenders überlappend mit dem abtriebsseitigen Ende des Langlochs. Der Anwender verschiebt beim Einsetzen mit dem Werkzeug den Sperrkörper einschließlich dem Schieber in Richtung zu dem antriebsseitigen Ende. An dem antriebsseitigen Ende kann der Sperrkörper ungehindert durch den radialen Anschlag radial ausweichen und den Aufnahmeraum freigeben. Die beiden Federn können an gegenüberliegenden Seiten des Schiebers angeordnet sein.In the basic position of the locking body is held by the slider on the output side end of the slot. The radial stop overlaps in the basic position in the axial direction with the locking body, whereby the locking body is held engaging in the basic position in the receiving space. The basic position corresponds to a locking position of the tool holder. A user can move the radial stop against the first spring to the drive-side end, after which the blocking body can emerge completely in the radial direction from the receiving space. A lying in the tool holder tool is released by this. The second spring facilitates insertion of the tool when the tool holder is held vertically. The second spring holds the radial stop without actuation of the user overlapping with the output side end of the slot. The user moves when inserting the tool, the locking body including the slider towards the drive end. At the drive end, the locking body can freely deflect radially through the radial stop and release the receiving space. The two springs may be disposed on opposite sides of the slider.

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 eine Handwerkzeugmaschine,
  • Fig. 2 eine Werkzeugaufnahme,
  • Fig. 3 eine Werkzeugaufnahme,
The following description explains the invention with reference to exemplary embodiments and figures. In the figures show:
  • Fig. 1 a hand tool,
  • Fig. 2 a tool holder,
  • Fig. 3 a tool holder,

Gleiche oder funktionsgleiche Elemente werden durch gleiche Bezugszeichen in den Figuren indiziert, soweit nicht anders angegeben. Radial und axiale Richtungen beziehen sich, soweit es nicht explizit anders angegeben, auf eine Arbeitsachse der Werkzeugmaschine. Orientierungen sind ohne weiteren Vermerk in Bezug auf eine Schlagrichtung der Werkzeugmaschine angegeben, wonach ein hinteres Element gegenüber einem vorderen Element in Schlagrichtung versetzt ist. Eine Länge bezeichnet eine Abmessung längs einer (Längs-) Richtung der größten Ausdehnung eines Körpers, eine Breite ist die größte Abmessung in der Ebene senkrecht zu der Längsrichtung.Identical or functionally identical elements are indicated by the same reference numerals in the figures, unless stated otherwise. Radial and axial directions, unless explicitly stated otherwise, refer to a working axis of the machine tool. Orientations are given without further notice with respect to a direction of impact of the machine tool, according to which a rear element is offset from a front element in the direction of impact. A length denotes a dimension along a (longitudinal) direction of the largest extension of a body, a width is the largest dimension in the plane perpendicular to the longitudinal direction.

AUSFÜHRUNGSFORMEN DER ERFINDUNGEMBODIMENTS OF THE INVENTION

Fig. 1 zeigt als Beispiel einer meißelnden Handwerkzeugmaschine schematisch einen Bohrhammer 1. Der Bohrhammer 1 hat eine Werkzeugaufnahme 2, in welche ein Schaftende 3 eines Werkzeug, z.B. eines des Bohrmeißels 4, eingesetzt werden kann. Einen primären Antrieb des Bohrhammers 1 bildet ein Motor 5, welcher ein Schlagwerk 6 und eine Abtriebswelle 7 antreibt. Ein Anwender kann den Bohrhammer 1 mittels eines Handgriffs 8 führen und mittels eines Systemschalters 9 den Bohrhammer 1 in Betrieb nehmen. Im Betrieb dreht der Bohrhammer 1 den Bohrmeißel 4 kontinuierlich um eine Arbeitsachse 10 und kann dabei den Bohrmeißel 4 in Schlagrichtung 11 längs der Arbeitsachse 10 in einen Untergrund schlagen. Fig. 1 schematically shows a hammer drill 1 as an example of a chiseling hand tool . The hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool, for example one of the drill bit 4, can be used. A primary drive of the hammer drill 1 is a motor 5, which drives a striking mechanism 6 and an output shaft 7 . A user can guide the hammer drill 1 by means of a handle 8 and take means of a system switch 9, the hammer drill 1 is in operation. In operation, the hammer drill 1 rotates the drill bit 4 continuously about a working axis 10 and can beat the drill bit 4 in the direction of impact 11 along the working axis 10 in a substrate.

Das Schlagwerk 6 ist beispielsweise ein pneumatisches Schlagwerk 6. Ein Erreger 12 und ein Schläger 13 sind in dem Schlagwerk 6 längs der Arbeitsachse 10 beweglich geführt. Der Erreger 12 ist über einen Exzenter 14 oder einen Taumelfinger an den Motor 5 angekoppelt und zu einer periodischen, linearen Bewegung gezwungen. Eine Luftfeder gebildet durch eine pneumatische Kammer 15 zwischen Erreger 12 und Schläger 13 koppelt eine Bewegung des Schlägers 13 an die Bewegung des Erregers 12 an. Der Schläger 13 kann direkt auf ein hinteres Ende des Bohrmeißels 4 aufschlagen oder mittelbar über einen im Wesentlichen ruhenden Zwischenschläger 16 einen Teil seines Impuls auf den Bohrmeißel 4 übertragen. Das Schlagwerk 6 und vorzugsweise die weiteren Antriebskomponenten sind innerhalb eines Maschinengehäuses 17 angeordnet.The percussion 6 is, for example, a pneumatic percussion 6. A pathogen 12 and a racket 13 are guided in the percussion 6 along the working axis 10 movable. The exciter 12 is coupled via an eccentric 14 or a wobble finger to the motor 5 and forced to a periodic, linear movement. An air spring formed by a pneumatic chamber 15 between exciter 12 and racket 13 couples a movement of the racket 13 to the movement of the exciter 12 at. The racket 13 can strike directly on a rear end of the drill bit 4 or indirectly transfer part of its pulse to the drill bit 4 via a substantially resting intermediate racket 16 . The striking mechanism 6 and preferably the further drive components are arranged within a machine housing 17 .

Fig. 2 zeigt eine beispielhafte Ausführungsform der Werkzeugaufnahme 2. Die Werkzeugaufnahme 2 hat eine von der Abtriebswelle 7 angetriebene hohle Spindel 20 mit einem Aufnahmeraum 21 für das Werkzeug 4. Das Werkzeug 4 kann durch eine abtriebsseitige Öffnung 22 in Einsetzrichtung 23 (entgegen der Schlagrichtung 11) in den Aufnahmeraum 21 eingesetzt werden. Der Aufnahmeraum 21 ist vorzugsweise komplementär zu dem Schaftende 3, z.B. zylindrisch ausgebildet. Fig. 2 shows an exemplary embodiment of the tool holder 2. The tool holder 2 has a driven by the output shaft 7 hollow spindle 20 with a receiving space 21 for the tool 4. The tool 4 can through an output-side opening 22 in the insertion direction 23 (opposite to the direction of impact 11) in the Recording room 21 are used. The receiving space 21 is preferably complementary to the shaft end 3, for example cylindrical.

Eine lösbare Verriegelung des mit Verriegelungsnuten versehenen Werkzeugs 4 in dem Aufnahmeraum 21 erfolgt mittels Sperrkörpern, hier beispielsweise mit Kugeln 24. Die Kugeln 24 sind in Langlöcher 25 in einer Wand 26 der hohlen Spindel 20 eingesetzt. Ein radiale Hemmung der Kugeln 24 erfolgt durch einen Verriegelungsring 27, an welchem von radial innen anliegend die Kugeln 24 teilweise in den Aufnahmeraum 21 hineinragen. Der in den Aufnahmeraum 21 hineinragende Teil der Kugeln 24 kann in die Verriegelungsnut des Werkzeugs 4 eingreifen. Ein federbelasteter Schieber 28 hält die Kugeln 24 innerhalb des Verriegelungsrings 27, d.h. axial mit dem Verriegelungsring 27 überlappend. Beim Einsetzen des Werkzeugs werden die Kugeln 24 gegen den federbelasteten Schieber 28 verschoben und gelangen aus dem Eingriff mit dem Verriegelungsring 27. Die Kugeln 24 können radial ausweichen und den Aufnahmeraum 21 freigeben. Der Verriegelungsring 27 kann durch eine Betätigungshülse 29 gegen den federbelasteten Schieber 28 verschoben werden, wodurch die radiale Hemmung der Kugeln 24 aufgehoben wird und ein eingesetztes Werkzeug entnehmbar ist.A releasable locking of the provided with locking grooves tool 4 in the receiving space 21 by means of blocking bodies, here for example with balls 24. The balls 24 are inserted into slots 25 in a wall 26 of the hollow spindle 20 . A radial inhibition of the balls 24 takes place by a locking ring 27, on which the balls 24 partially project from the radially inner side into the receiving space 21 . The projecting into the receiving space 21 part of the balls 24 can engage in the locking groove of the tool 4 . A spring-loaded slider 28 holds the balls 24 within the locking ring 27, ie, overlapping axially with the locking ring 27 . When inserting the tool 24 , the balls are moved against the spring-loaded slide 28 and get out of engagement with the locking ring 27. The balls 24 can dodge radially and release the receiving space 21 . The locking ring 27 can be moved by an actuating sleeve 29 against the spring-loaded slide 28 , whereby the radial inhibition of the balls 24 is released and an inserted tool can be removed.

Die beispielhafte Spindel 20 hat zwei gegenüberliegende Langlöcher 25 in ihrer mantelförmigen Wand 26. Die Langlöcher 25 sind parallel zu der Arbeitsachse 10 ausgerichtet, ein Abstand eines abtriebsseitigen Endes 30 von einem antriebsseitigen Ende 31 ist vorzugsweise größer als eine Breite der Langlöcher 25. In jedes der Langlöcher 25 ist eine der Kugeln 24 eingesetzt. Ein Durchmesser der Kugeln 24 ist größer als eine Wandstärke der Spindel 20, wodurch die Kugeln 24 teilweise in den Aufnahmeraum 21 hineinragen und teilweise über die Spindel 20 hinausstehen. Anstelle von Kugeln können Walzen, Rollen etc. als Sperrkörper eingesetzt werden.The exemplary spindle 20 has two opposite slots 25 in its shell-shaped wall 26. The slots 25 are aligned parallel to the working axis 10 , a distance of a driven-side end 30 of a drive-side end 31 is preferably greater than a width of the slots 25. In each of Long holes 25 , one of the balls 24 is inserted. A diameter of the balls 24 is greater than a wall thickness of the spindle 20, whereby the balls 24 partially project into the receiving space 21 and partially protrude beyond the spindle 20 . Instead of balls, rollers, rollers, etc. can be used as a blocking body.

Der Verriegelungsring 27 hat eine radial nach innen weisende Anschlagfläche 32. Die Anschlagfläche 32 ist vorzugsweise zylindrisch. Ein radialer Abstand der Anschlagfläche von der Arbeitsachse 10 ist derart bemessen, dass die Kugeln 24 die Anschlagfläche 32 berührend in den Aufnahmeraum 21 hineinragen. Eine axiale Abmessung der Anschlagfläche 32 ist geringer als eine Länge der Langlöcher 25, deren Abstand von abtriebsseitigen Ende 30 zu antriebsseitigen Ende 31. Die Anschlagfläche 32 und das abtriebsseitige Ende 30 des Langlochs 25 überlappen längs der Arbeitsachse 10 bei einer verriegelnden Stellung des Verriegelungsrings 27, welche zugleich die Grundstellung ist. In der Grundstellung besteht kein axialer Überlapp der Anschlagfläche 32 mit dem antriebsseitigen Ende 31 des Langlochs 25. Für eine entriegelnde Stellung ist der Verriegelungsring 27 gegenüber dem abtriebsseitigen Ende 30 wenigstens soweit axial versetzt, dass die Kugeln 24 radial ausweichend vollständig aus dem Aufnahmeraum 21 austreten können.The locking ring 27 has a radially inwardly facing stop surface 32. The stop surface 32 is preferably cylindrical. A radial distance of the stop surface of the working axis 10 is dimensioned such that the balls 24, the stop surface 32 in contact with the receiving space 21 protrude. An axial dimension of the abutment surface 32 is less than a length of the elongated holes 25 whose distance from the output side end 30 to the drive side end 31. The stop surface 32 and the output side end 30 of the elongated hole 25 overlap along the working axis 10 at a locking position of the locking ring 27, which is also the basic position. In the basic position, there is no axial overlap of the abutment surface 32 with the drive end 31 of the slot 25. For an unlocking position of the locking ring 27 is offset axially relative to the output end 30 at least so far that the balls 24 radially escape completely from the receiving space 21 ,

Der beispielhafte Verriegelungsring 27 ist material- und/oder formschlüssig mit der Betätigungshülse 29 verbunden. Die Betätigungshülse 29 hat eine freizugängliche Außenfläche, an welcher der Anwender diese greifen kann. Die Betätigungshülse 29 einschließlich dem Verriegelungsring 27 sind von einem Anwender aus einer Grundstellung in die entriegelnde Stellung verschiebbar.The exemplary locking ring 27 is material and / or positively connected to the actuating sleeve 29 . The actuating sleeve 29 has a freely accessible outer surface on which the user can grasp it. The actuating sleeve 29 including the locking ring 27 are displaceable by a user from a basic position to the unlocking position.

Der Schieber 28 ist antriebsseitig von den Kugeln 24 angeordnet. Der beispielhafte Schieber 28 ist eine ringförmige Scheibe, welche auf die Spindel 20 aufgeschoben ist. Der Schieber 28 ist längs der Arbeitsachse 10 gegenüber der Spindel 20, den Kugeln 24 und dem Verriegelungsring 27 axial beweglich. Die Kugeln 24 und der Schieber 28 überlappen in radialer Richtung 33, wodurch der Schieber 28 an den Kugeln 24 antriebsseitig anliegen kann.The slider 28 is arranged on the drive side of the balls 24 . The exemplary slider 28 is an annular disc which is slid onto the spindle 20 . The slider 28 is along the working axis 10 relative to the spindle 20, the balls 24 and the locking ring 27 axially movable. The balls 24 and the slider 28 overlap in the radial direction 33, whereby the slider 28 can abut the drive side 24 on the balls.

Eine erste Feder 34 wirkt in Schlagrichtung 11 auf den Schieber 28. Der durch die erste Feder 34 belastete Schieber 28 hält die Kugeln 24 an oder nahe dem abtriebsseitigen Ende 30 des Langlochs 25, wodurch die Kugeln 24 im Eingriff mit der radialen Anschlagfläche 32 sind. Der Verriegelungsring 27 oder die Betätigungshülse 29 bilden einen abtriebsseitigen Anschlag für den Schieber 28, wodurch die erste Feder 34 mittelbar auch auf den Verriegelungsring 27 wirken kann. Der Betätigungshülse 29 wirkt die erste Feder 34 beim Verschieben aus der Grundstellung in die entriegelnde Stellung entgegen.A first spring 34 acts in the direction of impact 11 on the slider 28. The loaded by the first spring 34 slider 28 holds the balls 24 at or near the output side end 30 of the slot 25, whereby the balls 24 are in engagement with the radial stop surface 32 . The locking ring 27 or the actuating sleeve 29 form a driven-side stop for the slider 28, whereby the first spring 34 can act indirectly on the locking ring 27 . The actuating sleeve 29 counteracts the first spring 34 when moving from the basic position to the unlocking position.

Eine zweite Feder 35 ist zwischen der Betätigungshülse 29 und dem Schieber 28 vorgespannt angeordnet. Die zweite Feder 35 berührt den gegenüber dem Verrieglungsring 27 axial beweglichen Schieber 28. Beim Einsetzen des Werkzeugs 4 schiebt das Werkzeug 4 die Kugeln 24 und mittelbar den Schieber 28 zu dem antriebsseitigen Ende 31 des Langlochs 25. Der Schieber 28 löst sich dabei von dem Verriegelungsring 27 bzw. der Betätigungshülse 29. Die zweite Feder 35 wirkt auf den Verriegelungsring 27 in Schlagrichtung 11 und hält somit den Verriegelungsring 27 in dessen Grundstellung nahe dem abtriebsseitigen Ende 30 des Langlochs 25. A second spring 35 is biased between the actuating sleeve 29 and the slider 28 . The second spring 35 contacts the opposite the locking ring 27 axially movable slide 28. When inserting the tool 4, the tool slides 4, the balls 24 and, indirectly, the slide 28 to the drive-side end 31 of the elongated hole 25. The slider 28 solubilisation of the locking ring 27 and the actuating sleeve 29. The second spring 35 acts on the locking ring 27 in the direction of impact 11 and thus holds the locking ring 27 in its normal position near the output-side end 30 of the elongated hole 25th

Die Betätigungshülse 29 hat einen axiale erste antriebsseitige Anlagefläche 36, an welchem der Schieber 28 in der Grundstellung anliegt. Längs der Arbeitsachse 10, in Schlagrichtung 11 versetzt zu der ersten Anlagefläche 36 ist eine zweite antriebsseitige Anlagefläche 37 vorgesehen. Die zweite Feder 35 ist an dieser zweiten Anlagefläche 37 angelegt.The actuating sleeve 29 has an axial first drive-side contact surface 36 on which the slider 28 rests in the basic position. Along the working axis 10, offset in the direction of impact 11 to the first contact surface 36 , a second drive-side contact surface 37 is provided. The second spring 35 is applied to this second abutment surface 37 .

Die beiden Federn 34, 35 können beispielsweise als Schraubenfedern ausgebildet sein. Die erste Feder 34 übt auf den Schieber 28 eine größere Kraft als die zweite Feder 35 aus.The two springs 34, 35 may be formed, for example, as coil springs. The first spring 34 exerts a greater force on the slider 28 than the second spring 35 .

Fig. 3 zeigt eine Abwandlung der Werkzeugaufnahme 2, bei welcher die zweite Feder 35' und die zweite Anlagefläche 37' variiert sind. Die Betätigungshülse 29 hat eine Tasche 38, deren axiales Ende die zweite Anlagefläche 37' ausbildet und in der die zweite Feder 35' angeordnet ist. Fig. 3 shows a modification of the tool holder 2, in which the second spring 35 ' and the second bearing surface 37' are varied. The actuating sleeve 29 has a pocket 38, the axial end of the second bearing surface 37 'is formed and in which the second spring 35' is arranged.

Claims (7)

Werkzeugaufnahme mit
einer Spindel (20), die einen längs einer Arbeitsachse (10) orientieren, abtriebsseitig offenen, zylindrischen oder prismatischen Aufnahmeraum (21) zum Aufnehmen eines Werkzeugs (4) in Einsetzrichtung (23) und ein in den Aufnahmeraum (21) in radialer Richtung (33) einstechendes Langloch (25) hat,
einem Sperrkörper (24), der in dem Langloch (25) liegend in den Aufnahmeraum (21) hineinragt und zwischen einem abtriebsseitigen Ende (30) des Langlochs (25) und einem antriebsseitigen Ende (31) des Langlochs (25) beweglich ist,
einem Schieber (28) zum Schieben des Sperrkörpers (24) zu dem abtriebsseitigen Ende (30) des Langlochs (25), wobei der Schieber (28) in radialer Richtung (33) mit dem Sperrkörper (24) überlappt und durch eine erste Feder (34) entgegen der Einsetzrichtung (23) kraftbeaufschlagt ist,
einem radialen Anschlag (27, 32), an dem in radialer Richtung (33) anliegend der Sperrkörper (24) in den Aufnahmeraum (21) eingreifend gezwungen ist, der in einer verriegelnden Stellung mit dem abtriebsseitigen Ende (30) des Langlochs (25) überlappt und entgegen der Einsetzrichtung (23), gegen eine Federkraft der ersten Feder (34) zum Freigeben einer radialen Bewegung des Sperrkörpers (24) aus dem Eingriff mit dem Aufnahmeraum (21) verschiebbar ist, und
einer zweiten Feder (35), die in Einsetzrichtung (23) an dem Schieber (28) abgestützt ist und den radialen Anschlag (27, 32) entgegen der Einsetzrichtung (23) kraftbeaufschlagt.Tool holder with
a spindle (20) which is oriented along a working axis (10), on the output side open cylindrical or prismatic receiving space (21) for receiving a tool (4) in the insertion direction (23) and in the receiving space (21) in the radial direction ( 33) has a piercing slot (25),
a blocking body (24) which projects into the receiving space (21) lying in the elongate hole (25) and is movable between an output-side end (30) of the oblong hole (25) and a drive-side end (31) of the oblong hole (25),
a slide (28) for pushing the blocking body (24) to the output side end (30) of the oblong hole (25), wherein the slide (28) overlaps in the radial direction (33) with the blocking body (24) and by a first spring ( 34) against the insertion direction (23) is subjected to force,
a radial stop (27, 32) on which in the radial direction (33) fitting the locking body (24) is forced into the receiving space (21) engaging in an interlocking position with the output end (30) of the slot (25) overlapped and against the insertion direction (23) against a spring force of the first spring (34) for releasing a radial movement of the locking body (24) out of engagement with the receiving space (21) is displaceable, and
a second spring (35) which is supported in the insertion direction (23) on the slide (28) and the radial stop (27, 32) counter to the insertion direction (23) subjected to force. Werkzeugaufnahme nach Anspruch 1 gekennzeichnet durch eine für einen Anwender bedienbare Betätigungshülse (29) zum Entriegeln des Werkzeugs (4), die einen Verriegelungsring (27) mit dem radial nach innen weisenden Anschlag (32) aufweist.Tool holder according to claim 1, characterized by a user-operable actuating sleeve (29) for unlocking the tool (4) having a locking ring (27) with the radially inwardly facing stop (32). Werkzeugaufnahme nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die zweite Feder (35) eine geringerer Federkraft als die erste Feder (34) auf den Schieber (28) ausübt.Tool holder according to claim 1 or 2, characterized in that the second spring (35) exerts a lower spring force than the first spring (34) on the slide (28). Werkzeugaufnahme nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zweite Feder (35) in jeder Stellung unter Vorspannung ist.Tool holder according to one of the preceding claims, characterized in that the second spring (35) is in each position under bias. Werkzeugaufnahme nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die erste Feder (34) antriebsseitig und die zweite Feder (35) abtriebsseitig von dem Schieber (28) angeordnet sind.Tool holder according to one of the preceding claims, characterized in that the first spring (34) on the drive side and the second spring (35) are arranged on the output side of the slide (28). Werkzeugaufnahme nach Anspruch 5, dadurch gekennzeichnet, dass die zweite Feder (35) den Schieber (28) berührt.Tool holder according to claim 5, characterized in that the second spring (35) contacts the slide (28). Werkzeugaufnahme nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die zweite Feder (35) abtriebsseitig an einer Betätigungshülse (29) anliegt.Tool holder according to claim 5 or 6, characterized in that the second spring (35) rests on the output side on an actuating sleeve (29).
EP12168787.5A 2011-06-09 2012-05-22 Tool holder Active EP2532486B1 (en)

Applications Claiming Priority (1)

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DE102011077244A DE102011077244A1 (en) 2011-06-09 2011-06-09 tool holder

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EP2532486B1 EP2532486B1 (en) 2016-03-23

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DE (1) DE102011077244A1 (en)

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WO2015061370A1 (en) 2013-10-21 2015-04-30 Milwaukee Electric Tool Corporation Adapter for power tool devices
GB201601856D0 (en) * 2016-02-02 2016-03-16 Black & Decker Inc Tool holder connection system

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EP2532486B1 (en) 2016-03-23
CN102814797B (en) 2016-09-14
DE102011077244A1 (en) 2012-12-13
CN102814797A (en) 2012-12-12
US9221165B2 (en) 2015-12-29
US20120313333A1 (en) 2012-12-13

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