EP2188094B1 - Hand power tool with a tool holder - Google Patents

Hand power tool with a tool holder Download PDF

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Publication number
EP2188094B1
EP2188094B1 EP08760742.0A EP08760742A EP2188094B1 EP 2188094 B1 EP2188094 B1 EP 2188094B1 EP 08760742 A EP08760742 A EP 08760742A EP 2188094 B1 EP2188094 B1 EP 2188094B1
Authority
EP
European Patent Office
Prior art keywords
drive spindle
tool holder
tool
power tool
portable power
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.)
Not-in-force
Application number
EP08760742.0A
Other languages
German (de)
French (fr)
Other versions
EP2188094A1 (en
Inventor
Joachim Hecht
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2188094A1 publication Critical patent/EP2188094A1/en
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Publication of EP2188094B1 publication Critical patent/EP2188094B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/0007—Connections or joints between tool parts
    • B25B23/0035—Connection means between socket or screwdriver bit and tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/02—Arrangements for handling screws or nuts
    • B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
    • B25B23/12—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using magnetic means
    • 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
    • Y10T279/23—Chucks or sockets with magnetic or electrostatic means

Definitions

  • the invention relates to a hand tool according to the preamble of claim 1.
  • Hand-held power tools with an integrated tool holder for receiving an insert tool e.g. a screwdriver bit
  • the tool holder has, for example, a hexagonal socket for receiving hexagon insert tools.
  • the insert tool is locked in the receptacle, for example by means of a spring-loaded ball in the axial direction.
  • the tool holder may be a magnetic tool holder with a magnet integrated in the tool holder. As a result, the insert tool is additionally held in the tool holder.
  • integrated magnetic tool holders only the insert tool is magnetized and held by design. The magnetization is not strong enough to magnetize the screw head of a screw to be processed and so to hold the insert tool.
  • a hand tool with a drive spindle and a tool holder integrated into the hand tool is made of DE 8 347 194 known.
  • the invention relates to a hand tool with a drive spindle and an integrated tool holder, wherein the drive spindle in a receptacle with the tool holder is rotatably connected and the tool holder at least one magnet having.
  • An integrated tool holder is understood to mean a tool holder which can be connected inseparably to the drive spindle and is thus firmly integrated into the handheld power tool, eg a screwdriver.
  • the invention makes it possible, on the one hand, to be able to sufficiently magnetise a screw to be processed by the hand tool, so that it is held on the insert tool (also referred to as a bit), and on the other hand to achieve a sufficiently good concentricity of the tool holder.
  • a good concentricity is understood in particular to mean that an ideal bit at a distance of 40 mm has less than 0.3 mm concentricity deviation.
  • the drive spindle with the tool holder is connectable such that at least a first portion of the drive spindle is firmly connected to the tool holder, and at least a second portion of the drive spindle is present, which is at least as long as the first portion.
  • the second section is longer than the first section.
  • the diameter of the drive spindle may be the same or different in the region of the first and the second section.
  • a particularly good concentricity is achieved in that the length of the second section is at least 0.8 times the diameter of the drive spindle in the region of the second section.
  • the second section is preferably at most as large as twice the diameter of the drive spindle in the region of the second section.
  • the second section can also be greater than twice the diameter of the drive spindle.
  • this would lead to a larger overall length, which would not be desirable for many applications or for many hand tooling machines.
  • the length of the first section is preferably at least 0.4 times the diameter of the drive spindle in the region of the first section.
  • the drive spindle is preferably made of a magnetizable steel, such as austenitic steel.
  • the tool holder is preferably made of a steel which is not or only slightly magnetizable, eg V2A steel.
  • the magnet is received in the tool holder such that it bears against the output-side end face of the drive spindle.
  • the diameter of the magnet is chosen to be larger than the width of the key size of the hexagonal socket for the insert tool. Therefore, the magnet can not fall out of the hex socket.
  • the tool holder For fixing the tool holder on the drive spindle, the tool holder has a receptacle into which the drive spindle can be pressed.
  • the first part is firmly connected to the tool holder by means of axial pressure.
  • the first part is provided with an axial knurling. This allows the transmission of high torques.
  • the second section which is connected by means of radial pressure with the tool holder, serves to guide and thus improve the concentricity.
  • the second section contributes to torque transmission.
  • a third section is provided, which is analogous to the second section of the drive spindle by means of radial pressure with the tool holder connectable.
  • the first portion between the second and third portion is arranged. This achieves double centering.
  • FIG. 1 shows a hand tool 1 in the form of a cordless screwdriver.
  • the hand tool has a tool holder 10 with a screwdriver bit as an insert tool 2 (hereinafter referred to simply as bit).
  • the tool holder 10 is firmly integrated into the hand tool 1. He is partially in the housing 3 of Hand tool 1 added.
  • the tool holder 10 is a magnetic tool holder.
  • Fig. 2 shows an enlarged section of the tool holder 10 without screwdriver bit.
  • the tool holder 10 has a receiving opening 11 for receiving the insert tool 2.
  • the receiving opening 11 is polygonal, in particular hexagonal, designed to receive hex bits 2.
  • an actuating means 12 is provided in the form of an axially displaceable sleeve. In the illustrated embodiment of the locking or unlocking the locking takes place automatically when inserting the insert tool 2 by the locking means 13, here in the form of a ball, in a corresponding recess (not shown) in the bit 2 engages.
  • the actuating means 12 is moved against the spring force of the spring 14 in the axial direction. In the illustration after Fig. 2 the actuating means 12 is shifted to the left, so that the locking means 13 releases the bit 2.
  • the tool holder 10 is integrated into the power tool 1 by being rotatably and permanently connected to the drive spindle 30.
  • the tool holder 10 has a receptacle 16, in which the output-side end of the drive spindle 30 is received and pressed into the tool holder 10.
  • the receptacle 16 In the receptacle 16 at least a first portion 31 of the drive spindle 30 is fixedly connected to the tool holder 10 by means of axial pressure.
  • the first portion 31 is provided with an axial knurling 35.
  • the length of the first section 31 is at least 0.4 times the diameter of the drive spindle 30 in the region of the first section 31.
  • the drive spindle 30 comprises at least a second portion 32, which is at least as long as the first portion 31.
  • the second portion 32 is either not fixedly connected to the tool holder 10 or fixed by radial pressure with the tool holder 10 in the receptacle 16.
  • the length of the second portion 32 is at least 0.8 times the diameter of the drive spindle 30 in the region of the second portion 32 and is at most as large as twice the diameter of the drive spindle 30, also in the region of the second portion 32. It serves to guide and thus the improvement of the concentricity properties.
  • the drive spindle 30 is preferably made of a magnetizable steel, such as austenitic steel.
  • the tool holder 10 preferably consists of a steel which is not or only slightly magnetizable, eg, V2A steel.
  • the tool holder 10 has a magnet 15, which is accommodated in the tool holder 10 and abuts against the output-side end face 36 of the drive spindle 30.
  • the tool holder 10 according to the invention makes it possible to magnetize the insert tool 2 and the screw to be processed (not shown), so that the screw is held on the insert tool 2.
  • FIG Fig. 5 An alternative embodiment of the tool holder 10a according to the invention is shown schematically in FIG Fig. 5 shown.
  • a double centering is provided by the drive spindle 30 has a third portion 33, which is analogous to the second portion 32 of the drive spindle 30 by means of radial pressure with the tool holder 10 in the receptacle 16 connectable.
  • the first portion 31 is disposed between the second portion 32 and third portion 33.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Jigs For Machine Tools (AREA)

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a hand tool according to the preamble of claim 1.

Aus dem Stand der Technik sind Handwerkzeugmaschinen mit integriertem Werkzeughalter zur Aufnahme eines Einsatzwerkzeuges, z.B. eines Schrauberbits, bekannt. Der Werkzeughalter hat beispielsweise eine Sechskantaufnahme zur Aufnahme von Sechskant-Einsatzwerkzeugen. Das Einsatzwerkzeug wird in der Aufnahme beispielsweise mittels einer federbelasteten Kugel in axialer Richtung verriegelt. Der Werkzeughalter kann ein Magnetwerkzeughalter mit einem in den Werkzeughalter integrierten Magneten sein. Dadurch wird das Einsatzwerkzeug zusätzlich in dem Werkzeughalter gehalten. Bei integrierten Magnetwerkzeughaltern wird konstruktionsbedingt nur das Einsatzwerkzeug magnetisiert und gehalten. Die Magnetisierung ist nicht ausreichend stark, um auch den Schraubenkopf einer zu verarbeitende Schraube zu magnetisieren und so an dem Einsatzwerkzeug zu halten.Hand-held power tools with an integrated tool holder for receiving an insert tool, e.g. a screwdriver bit, known. The tool holder has, for example, a hexagonal socket for receiving hexagon insert tools. The insert tool is locked in the receptacle, for example by means of a spring-loaded ball in the axial direction. The tool holder may be a magnetic tool holder with a magnet integrated in the tool holder. As a result, the insert tool is additionally held in the tool holder. With integrated magnetic tool holders, only the insert tool is magnetized and held by design. The magnetization is not strong enough to magnetize the screw head of a screw to be processed and so to hold the insert tool.

Ebenfalls aus dem Stand der Technik bekannt sind separate Magnetwerkzeughalter, welche nicht fest in der Handwerkzeugmaschine integriert sind, sondern in eine Aufnahme der Handwerkzeugmaschine eingesteckt und drehfest gehalten werden. Bei derartigen separaten Magnetwerkzeughaltern gelingt es, die zu verarbeitende Schraube gut zu magnetisieren. Der Nachteil der separaten Werkzeughalter liegt jedoch in ihrer konstruktionsbedingt ungenügenden Rundlaufeigenschaft, die daher rührt, dass üblicherweise die Antriebsspindel mit Sechskantprofil direkt in eine Bohrung eingepresst wird oder das Sechskantprofil der Antriebsspindel relativ zu der Sechskantaufnahme des Werkzeughalters radial verdreht und so axial verpresst wird. .Also known from the prior art are separate magnetic tool holder, which are not firmly integrated in the power tool, but are plugged into a receptacle of the power tool and held against rotation. With such separate magnetic tool holders, it is possible to magnetize the screw to be processed well. The disadvantage of the separate tool holder, however, lies in its design-inherent insufficient concentricity, which is due to the fact that usually the drive spindle with hexagonal profile is pressed directly into a hole or the hexagonal profile of the drive spindle is radially rotated relative to the hexagonal receptacle of the tool holder and axially compressed. ,

Ein Handwerkzeug mit einer Antriebsspindel und einem fest in das Handwerkzeug integrierten Werkzeughalter ist aus der DE 8 347 194 bekannt.A hand tool with a drive spindle and a tool holder integrated into the hand tool is made of DE 8 347 194 known.

Offenbarung der ErfindungDisclosure of the invention

Die Erfindung geht aus von einer Handwerkzeugmaschine mit einer Antriebsspindel und einem integrierten Werkzeughalter, wobei die Antriebsspindel in einer Aufnahme mit dem Werkzeughalter drehfest verbindbar ist und der Werkzeughalter zumindest einen Magneten aufweist. Unter einem integrierten Werkzeughalter wird ein Werkzeughalter verstanden, welcher unlösbar mit der Antriebsspindel verbindbar ist und somit fest in die Handwerkzeugmaschine, z.B. einen Schrauber, integriert ist.The invention relates to a hand tool with a drive spindle and an integrated tool holder, wherein the drive spindle in a receptacle with the tool holder is rotatably connected and the tool holder at least one magnet having. An integrated tool holder is understood to mean a tool holder which can be connected inseparably to the drive spindle and is thus firmly integrated into the handheld power tool, eg a screwdriver.

Die Erfindung erlaubt es, einerseits eine mit der Handwerkzeugmaschine zu verarbeitende Schraube ausreichend gut magnetisieren zu können, so dass sie an dem Einsatzwerkzeug (auch als Bit bezeichnet) gehalten wird, und andererseits eine ausreichend gute Rundlaufeigenschaft des Werkzeughalters zu erzielen. Unter einer guten Rundlaufeigenschaft wird insbesondere verstanden, dass ein idealer Bit in einem Abstand von 40 mm weniger als 0,3 mm Rundlaufabweichung aufweist. Dies wird dadurch erreicht, dass die Antriebsspindel mit dem Werkzeughalter derart verbindbar ist, dass zumindest ein erstes Teilstück der Antriebsspindel fest mit dem Werkzeughalter verbindbar ist, und zumindest ein zweites Teilstück der Antriebsspindel vorhanden ist, welches mindestens so lang ist wie das erste Teilstück. Insbesondere ist das zweite Teilstück länger als das erste Teilstück. Der Durchmesser der Antriebsspindel kann im Bereich des ersten und des zweiten Teilstücks gleich oder verschieden sein.The invention makes it possible, on the one hand, to be able to sufficiently magnetise a screw to be processed by the hand tool, so that it is held on the insert tool (also referred to as a bit), and on the other hand to achieve a sufficiently good concentricity of the tool holder. A good concentricity is understood in particular to mean that an ideal bit at a distance of 40 mm has less than 0.3 mm concentricity deviation. This is achieved in that the drive spindle with the tool holder is connectable such that at least a first portion of the drive spindle is firmly connected to the tool holder, and at least a second portion of the drive spindle is present, which is at least as long as the first portion. In particular, the second section is longer than the first section. The diameter of the drive spindle may be the same or different in the region of the first and the second section.

Eine besonders gute Rundlaufeigenschaft wird dadurch erzielt, dass die Länge des zweiten Teilstücks mindestens das 0,8-fache des Durchmessers der Antriebsspindel im Bereich des zweiten Teilstücks beträgt. Das zweite Teilstück ist bevorzugt maximal so groß wie der zweifache Durchmesser der Antriebsspindel im Bereich des zweiten Teilstücks. Prinzipiell kann das zweite Teilstück auch größer als der zweifache Durchmesser der Antriebsspindel sein. Dies würde jedoch zu einer größeren Baulänge führen, was für viele Anwendungen bzw. für viele Handwerkzeugmaschinen nicht wünschenswert wäre.A particularly good concentricity is achieved in that the length of the second section is at least 0.8 times the diameter of the drive spindle in the region of the second section. The second section is preferably at most as large as twice the diameter of the drive spindle in the region of the second section. In principle, the second section can also be greater than twice the diameter of the drive spindle. However, this would lead to a larger overall length, which would not be desirable for many applications or for many hand tooling machines.

Die Länge des ersten Teilstücks beträgt vorzugsweise mindestens das 0,4-fache des Durchmessers der Antriebsspindel im Bereich des ersten Teilstücks.The length of the first section is preferably at least 0.4 times the diameter of the drive spindle in the region of the first section.

Um die mit der Handwerkzeugmaschine, z.B. einem Schrauber, zu verarbeitende Schraube gut magnetisieren zu können, besteht die Antriebsspindel bevorzugt aus einem magnetisierbaren Stahl, z.B. aus austenitischem Stahl. Der Werkzeughalter besteht bevorzugt aus einem nicht oder nur schwach magnetisierbaren Stahl, z.B. V2A Stahl. Dabei ist der Magnet derart in dem Werkzeughalter aufgenommen, dass er an der abtriebsseitigen Stirnseite der Antriebsspindel anliegt. Hierfür ist beispielsweise der Durchmesser des Magneten größer gewählt als die Breite des Schlüsselmaßes der Sechskantaufnahme für das Einsatzwerkzeug. Deshalb kann der Magnet nicht aus der Sechskantaufnahme herausfallen.In order to be able to magnetize well with the hand tool, such as a screwdriver to be processed screw, the drive spindle is preferably made of a magnetizable steel, such as austenitic steel. The tool holder is preferably made of a steel which is not or only slightly magnetizable, eg V2A steel. In this case, the magnet is received in the tool holder such that it bears against the output-side end face of the drive spindle. For this purpose, for example, the diameter of the magnet is chosen to be larger than the width of the key size of the hexagonal socket for the insert tool. Therefore, the magnet can not fall out of the hex socket.

Zur Befestigung des Werkzeughalters auf der Antriebsspindel weist der Werkzeughalter eine Aufnahme auf, in die die Antriebsspindel einpressbar ist. Das erste Teilstück ist fest mit dem Werkzeughalter mittels axialer Pressung verbunden. Hierfür ist das erste Teilstücks mit einer axialen Rändelung versehen. Dies ermöglicht die Übertragung hoher Drehmomente.For fixing the tool holder on the drive spindle, the tool holder has a receptacle into which the drive spindle can be pressed. The first part is firmly connected to the tool holder by means of axial pressure. For this purpose, the first part is provided with an axial knurling. This allows the transmission of high torques.

Das zweite Teilstück, welches mittels radialer Pressung mit dem Werkzeughalter verbunden ist, dient der Führung und damit der Verbesserung der Rundlaufeigenschaften. Das zweite Teilstück trägt zur Drehmomentübertragung bei.The second section, which is connected by means of radial pressure with the tool holder, serves to guide and thus improve the concentricity. The second section contributes to torque transmission.

In einer weiterführenden Ausgestaltung der erfindungsgemäßen Handwerkzeugmaschine ist ein drittes Teilstück vorgesehen, welches analog zu dem zweiten Teilstück der Antriebsspindel mittels radialer Pressung mit dem Werkzeughalter verbindbar ist. Dabei ist das erste Teilstück zwischen dem zweiten und dritten Teilstück angeordnet. Dadurch wird eine doppelte Zentrierung erreicht.In a further embodiment of the hand tool according to the invention, a third section is provided, which is analogous to the second section of the drive spindle by means of radial pressure with the tool holder connectable. In this case, the first portion between the second and third portion is arranged. This achieves double centering.

Nachfolgend wird die Erfindung anhand der beigefügten Zeichnungen näher erläutert. Es zeigen

Figur 1
eine erfindungsgemäße Handwerkzeugmaschine mit einem Werkzeughalter in perspektivischer Ansicht
Figur 2
eine Schnittdarstellung des Werkzeughalters mit Antriebsspindel
Figur 3
eine vergrößerte Schnittdarstellung des Werkzeughalters nach Fig. 2
Figur 4
die Antriebsspindel in perspektivischer Ansicht
Figur 5
eine schematische Darstellung einer alternativen Ausführungsform eines Werkzeughalters.
The invention will be explained in more detail with reference to the accompanying drawings. Show it
FIG. 1
a hand tool according to the invention with a tool holder in a perspective view
FIG. 2
a sectional view of the tool holder with drive spindle
FIG. 3
an enlarged sectional view of the tool holder according to Fig. 2
FIG. 4
the drive spindle in perspective view
FIG. 5
a schematic representation of an alternative embodiment of a tool holder.

Figur 1 zeigt eine Handwerkzeugmaschine 1 in Form eines Akkuschraubers. Die Handwerkzeugmaschine besitzt einen Werkzeughalter 10 mit einem Schrauberbit als Einsatzwerkzeug 2 (nachfolgend vereinfacht auch als Bit bezeichnet). Der Werkzeughalter 10 ist fest in die Handwerkzeugmaschine 1 integriert. Er ist teilweise in dem Gehäuse 3 der Handwerkzeugmaschine 1 aufgenommen. Der Werkzeughalter 10 ist ein Magnetwerkzeughalter. FIG. 1 shows a hand tool 1 in the form of a cordless screwdriver. The hand tool has a tool holder 10 with a screwdriver bit as an insert tool 2 (hereinafter referred to simply as bit). The tool holder 10 is firmly integrated into the hand tool 1. He is partially in the housing 3 of Hand tool 1 added. The tool holder 10 is a magnetic tool holder.

Fig. 2 zeigt einen vergrößerten Ausschnitt des Werkzeughalters 10 ohne Schrauberbit. Der Werkzeughalter 10 weist eine Aufnahmeöffnung 11 zur Aufnahme des Einsatzwerkzeugs 2 auf. Die Aufnahmeöffnung 11 ist mehrkantig, insbesondere sechskantig, ausgebildet zur Aufnahme von Sechskant-Bits 2. Zum Verriegeln und Entriegeln eines Bits 2 in dem Werkzeughalter 10 ist ein Betätigungsmittel 12 in Form einer axial verschiebbaren Hülse vorgesehen. In der dargestellten Ausführungsform des Verriegelungs- bzw. Entriegelungsmechanismus erfolgt die Verriegelung selbsttätig beim Einführen des Einsatzwerkzeugs 2, indem das Verriegelungsmittel 13, hier in Form einer Kugel, in eine korrespondierende Ausnehmung (nicht dargestellt) in dem Bit 2 eingreift. Zum Entriegeln des Bits 2 wird das Betätigungsmittel 12 entgegen der Federkraft der Feder 14 in axialer Richtung bewegt. In der Darstellung nach Fig. 2 wird das Betätigungsmittel 12 nach links verschoben, so dass das Verriegelungsmittel 13 den Bit 2 freigibt. Fig. 2 shows an enlarged section of the tool holder 10 without screwdriver bit. The tool holder 10 has a receiving opening 11 for receiving the insert tool 2. The receiving opening 11 is polygonal, in particular hexagonal, designed to receive hex bits 2. For locking and unlocking a bit 2 in the tool holder 10, an actuating means 12 is provided in the form of an axially displaceable sleeve. In the illustrated embodiment of the locking or unlocking the locking takes place automatically when inserting the insert tool 2 by the locking means 13, here in the form of a ball, in a corresponding recess (not shown) in the bit 2 engages. To unlock the bit 2, the actuating means 12 is moved against the spring force of the spring 14 in the axial direction. In the illustration after Fig. 2 the actuating means 12 is shifted to the left, so that the locking means 13 releases the bit 2.

Der Werkzeughalter 10 ist in die Handwerkzeugmaschine 1 integriert, indem er mit der Antriebsspindel 30 drehfest und unlösbar verbunden ist. Hierfür weist der Werkzeughalter 10 eine Aufnahme 16 auf, in der das abtriebsseitige Ende der Antriebsspindel 30 aufgenommen und in den Werkzeughalter 10 eingepresst ist. In der Aufnahme 16 ist zumindest ein erstes Teilstück 31 der Antriebsspindel 30 mit dem Werkzeughalter 10 mittels axialer Pressung fest verbunden. Dazu ist das erste Teilstück 31 mit einer axialen Rändelung 35 versehen. Die Länge des ersten Teilstücks 31 beträgt mindestens das 0,4-fache des Durchmessers der Antriebsspindel 30 im Bereich des ersten Teilstücks 31.The tool holder 10 is integrated into the power tool 1 by being rotatably and permanently connected to the drive spindle 30. For this purpose, the tool holder 10 has a receptacle 16, in which the output-side end of the drive spindle 30 is received and pressed into the tool holder 10. In the receptacle 16 at least a first portion 31 of the drive spindle 30 is fixedly connected to the tool holder 10 by means of axial pressure. For this purpose, the first portion 31 is provided with an axial knurling 35. The length of the first section 31 is at least 0.4 times the diameter of the drive spindle 30 in the region of the first section 31.

Die Antriebsspindel 30 umfasst zumindest ein zweites Teilstück 32, welches mindestens so lang ist wie das erste Teilstück 31. Das zweite Teilstück 32 ist entweder nicht fest mit dem Werkzeughalter 10 verbunden oder mittels radialer Pressung mit dem Werkzeughalter 10 in der Aufnahme 16 befestigt. Die Länge des zweiten Teilstücks 32 beträgt mindestens das 0,8-fache des Durchmessers der Antriebsspindel 30 im Bereich des zweiten Teilstücks 32 und ist maximal so groß wie der zweifache Durchmesser der Antriebsspindel 30, ebenfalls im Bereich des zweiten Teilstücks 32. Es dient der Führung und damit der Verbesserung der Rundlaufeigenschaften.The drive spindle 30 comprises at least a second portion 32, which is at least as long as the first portion 31. The second portion 32 is either not fixedly connected to the tool holder 10 or fixed by radial pressure with the tool holder 10 in the receptacle 16. The length of the second portion 32 is at least 0.8 times the diameter of the drive spindle 30 in the region of the second portion 32 and is at most as large as twice the diameter of the drive spindle 30, also in the region of the second portion 32. It serves to guide and thus the improvement of the concentricity properties.

Die Antriebsspindel 30 ist bevorzugt aus einem magnetisierbaren Stahl, z.B. aus austenitischem Stahl. Der Werkzeughalter 10 besteht dagegen bevorzugt aus einem nicht bzw. nur schwach magnetisierbaren Stahl, z.B. V2A Stahl.The drive spindle 30 is preferably made of a magnetizable steel, such as austenitic steel. By contrast, the tool holder 10 preferably consists of a steel which is not or only slightly magnetizable, eg, V2A steel.

Zusätzlich weist der Werkzeughalter 10 einen Magneten 15 auf, der in dem Werkzeughalter 10 aufgenommen ist und an der abtriebsseitigen Stirnseite 36 der Antriebsspindel 30 anliegt. Der erfindungsgemäße Werkzeughalter 10 erlaubt es, das Einsatzwerkzeug 2 und die zu verarbeitende Schraube (nicht dargestellt) zu magnetisieren, so dass die Schraube an dem Einsatzwerkzeug 2 gehalten wird.In addition, the tool holder 10 has a magnet 15, which is accommodated in the tool holder 10 and abuts against the output-side end face 36 of the drive spindle 30. The tool holder 10 according to the invention makes it possible to magnetize the insert tool 2 and the screw to be processed (not shown), so that the screw is held on the insert tool 2.

Eine alternative Ausgestaltung des erfindungsgemäßen Werkzeughalters 10a ist schematisch in Fig. 5 gezeigt. Hierbei ist eine doppelte Zentrierung vorgesehen, indem die Antriebsspindel 30 ein drittes Teilstück 33 aufweist, welches analog zu dem zweiten Teilstück 32 der Antriebsspindel 30 mittels radialer Pressung mit dem Werkzeughalter 10 in der Aufnahme 16 verbindbar ist. Dabei ist das erste Teilstück 31 zwischen dem zweiten Teilstück 32 und dritten Teilstück 33 angeordnet.An alternative embodiment of the tool holder 10a according to the invention is shown schematically in FIG Fig. 5 shown. Here, a double centering is provided by the drive spindle 30 has a third portion 33, which is analogous to the second portion 32 of the drive spindle 30 by means of radial pressure with the tool holder 10 in the receptacle 16 connectable. In this case, the first portion 31 is disposed between the second portion 32 and third portion 33.

Claims (7)

  1. Portable power tool having a drive spindle (30) and a tool holder (10) firmly integrated in the portable power tool, wherein the tool holder (10) has a receptacle (16) for receiving the output-side end of the drive spindle (30) and is connected non-detachably to the drive spindle (30) for rotation therewith, and has at least one magnet (15) resting against the output-side end side (36) of the drive spindle (30), characterized in that in the receptacle (16) at least a first part (31) of the drive spindle (30) is provided with axial knurling (35) and is firmly connected to the tool holder (10) by means of axial pressing, and at least a second part (32) of the drive spindle (30) is connected to the tool holder (10) by means of radial pressing, wherein the second part (32) is at least as long as the first part (31) and the magnet (15) rests against the output-side end side (36) of the second part (32).
  2. Portable power tool according to Claim 1, characterized in that the second part (32) is longer than the first part (31).
  3. Portable power tool according to either of the preceding claims, characterized in that the length of the second part (32) is at least 0.8 times the diameter of the drive spindle (30) in the region of the second part (32).
  4. Portable power tool according to one of the preceding claims, characterized in that the length of the second part (32) is at most twice as large as the diameter of the drive spindle (30) in the region of the second part (32).
  5. Portable power tool according to one of the preceding claims, characterized in that the drive spindle (30) consists of a magnetizable steel.
  6. Portable power tool according to one of the preceding claims, characterized in that the tool holder (10) consists of a non-magnetizable steel.
  7. Portable power tool according to one of the preceding claims, characterized in that a third part (33) of the drive spindle (30) is provided, said third part (33) being connectable to the tool holder (10) by means of radial pressing, wherein the first part (31) is arranged between the second and third parts (32, 33).
EP08760742.0A 2007-08-01 2008-06-09 Hand power tool with a tool holder Not-in-force EP2188094B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202007010699U DE202007010699U1 (en) 2007-08-01 2007-08-01 Hand tool
PCT/EP2008/057178 WO2009015932A1 (en) 2007-08-01 2008-06-09 Hand power tool with a tool holder

Publications (2)

Publication Number Publication Date
EP2188094A1 EP2188094A1 (en) 2010-05-26
EP2188094B1 true EP2188094B1 (en) 2013-10-23

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ID=38565383

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08760742.0A Not-in-force EP2188094B1 (en) 2007-08-01 2008-06-09 Hand power tool with a tool holder

Country Status (5)

Country Link
US (1) US8276483B2 (en)
EP (1) EP2188094B1 (en)
CN (1) CN101765482B (en)
DE (1) DE202007010699U1 (en)
WO (1) WO2009015932A1 (en)

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Also Published As

Publication number Publication date
EP2188094A1 (en) 2010-05-26
CN101765482A (en) 2010-06-30
DE202007010699U1 (en) 2007-10-04
CN101765482B (en) 2013-03-27
US8276483B2 (en) 2012-10-02
US20100225075A1 (en) 2010-09-09
WO2009015932A1 (en) 2009-02-05

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