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EP2172317B2 - Hand-held machine tool - Google Patents
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EP2172317B2 - Hand-held machine tool - Google Patents

Hand-held machine tool Download PDF

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Publication number
EP2172317B2
EP2172317B2 EP09016052.4A EP09016052A EP2172317B2 EP 2172317 B2 EP2172317 B2 EP 2172317B2 EP 09016052 A EP09016052 A EP 09016052A EP 2172317 B2 EP2172317 B2 EP 2172317B2
Authority
EP
European Patent Office
Prior art keywords
tool
fitting elements
portable power
drive shaft
power tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP09016052.4A
Other languages
German (de)
French (fr)
Other versions
EP2172317B1 (en
EP2172317A1 (en
Inventor
Ulrich Bohne
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
Original Assignee
Robert Bosch GmbH
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=35058753&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2172317(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2172317A1 publication Critical patent/EP2172317A1/en
Publication of EP2172317B1 publication Critical patent/EP2172317B1/en
Application granted granted Critical
Publication of EP2172317B2 publication Critical patent/EP2172317B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2614—Means for mounting the cutting member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B19/00—Other reciprocating saws with power drive; Fret-saws
    • B27B19/006—Other reciprocating saws with power drive; Fret-saws with oscillating saw blades; Hand saws with oscillating saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29—Details; Component parts; Accessories
    • B27B5/30—Details; Component parts; Accessories for mounting or securing saw blades or saw spindles
    • B27B5/32—Devices for securing circular saw blades to the saw spindle
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49947—Assembling or joining by applying separate fastener
    • Y10T29/49963—Threaded fastener
    • 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
    • Y10T403/00—Joints and connections
    • Y10T403/75—Joints and connections having a joining piece extending through aligned openings in plural members
    • 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
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • 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
    • Y10T83/00—Cutting
    • Y10T83/687—By tool reciprocable along elongated edge
    • Y10T83/7045—Arcuately oscillating tool carried on single pivot
    • 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
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9377—Mounting of tool about rod-type shaft
    • Y10T83/9379—At end of shaft
    • 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
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection
    • 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
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection
    • Y10T83/9464—For rotary tool

Definitions

  • the invention relates to a hand tool machine with a device for fastening an axially attachable tool to an oscillating drivable drive shaft of a hand tool according to the preamble of claim 1, and a tool according to the preamble of claim 14.
  • the device comprises a centering recess and six positive locking elements designed as tips in an outline of the centering recess, which are therefore part of the centering recess.
  • the US 2003/176147 A1 discloses an angle grinder with a tool holder, which has a collar, which serves as a centering element, and three bolts, which serve as positive locking elements.
  • the tool holder is provided for fastening a tool to a drive shaft rotating about a rotation axis.
  • the bolts engage positively in a mounted state in recesses of the tool.
  • the bolts are cylindrical and have a round cross section and thus a curved driving surface.
  • the DE 199 14 956 A1 discloses a tool holder of a grinder for attachment of an axially attachable tool to the grinder.
  • the tool holder has an intermediate flange plate with two positive locking elements.
  • the interlocking elements are intended to intervene in an assembled state formed in recesses of the tool as locking openings.
  • the interlocking elements are cylindrical and have a round cross section and thus a curved driving surface.
  • the US 3,943,934 A discloses a bone saw with a device having a pin and interlocking elements for attaching a tool to an oscillating drive shaft.
  • the interlocking elements are provided for fixing a rotational position of the tool relative to the drive shaft.
  • the EP 0 554 929 A1 discloses a tool holder intended for attachment of a blade to a surgical saw.
  • the tool holder has a clamping surface having a plurality of pins which are adapted to correspond to recesses of the blade and to transmit in an operating state an oscillating movement of a drive shaft of the surgical saw on the blade.
  • the preambles of independent claims 1 and 14 are based on this document.
  • the US 2002/116023 A1 discloses a saw blade having at a front end a toothing and at a rear end a receiving area for attachment to a tool holder of a power tool.
  • the receiving region comprises a centering recess formed by a slot and a plurality of form-locking elements formed by round recesses.
  • the invention relates to a hand tool according to claim 1 with a device having a centering element and at least one positive locking element for attaching an axially attachable tool to an oscillating drivable drive shaft of a power tool, wherein the centering for centering the tool to the drive shaft and the interlocking element for fixing a rotational position of the tool is provided relative to the drive shaft.
  • the positive-locking element is arranged radially outside the centering element.
  • an advantageous separation of a centering function from a fixing function and / or from a torque transmission function can be achieved so that a more comfortable fastening operation can be achieved.
  • an advantageously large lever for transmitting torque can be achieved with comparatively little material load in the area of the positive-locking element, without losing precision in a centering operation.
  • the centering element has a circular cross-section. It can thereby be achieved that after the centering, the rotational position is freely selectable and independent of the centering.
  • the centering element can be formed both as a circular recess and as a bolt with a circular cross-section.
  • a robust and secure positive connection can be achieved if the form-locking element is provided for engagement in a recess.
  • a secure hold of the positive-locking element can be achieved if the positive-locking element has at least one contact surface extending in the axial direction.
  • the device can advantageously be suitable for fastening a tool having three possible working positions, in particular a tool having a threefold symmetry, for example a triangular grinding plate be.
  • the device is provided for fixing a tool having a fourfold symmetry or working positions differing by 90 °.
  • a diving saw blade is called.
  • a device that can be universally used for a variety of different tools is inventively achieved in that the positive locking element is provided for fixing the tool in twelve rotational positions.
  • the rotational positions are evenly distributed over an angular range, a flexible adjustment while safe torque transmission is achievable.
  • a rotationally symmetrical device is achievable if the angular range is 360 °.
  • a device which can advantageously be used flexibly for tools with a threefold symmetry and with a fourfold symmetry can be achieved, which is particularly suitable both for fastening a triangular sanding plate and a dipping saw blade.
  • a low-torque torque transmission with simultaneous precise centering of the tool can be achieved if a position of the form-fitting element associated radius is more than twice as large as a radius of the centering element. If a plurality of interlocking elements arranged on a circle, the interlocking elements of the radius of the circle can be assigned, otherwise the radial distance of the interlocking element or an edge thereof from a rotational axis of the drive shaft.
  • a cost-effective and secure form-fitting element can be achieved if the positive-locking element is formed pin-shaped.
  • the device has a multiplicity of uniform form-locking elements distributed uniformly on a circle around the centering element, asymmetrical loading of the device during torque transmission can be avoided.
  • a punctual material load can be avoided if the positive-locking element has at least one substantially driving surface directed in the circumferential direction.
  • the direction of the surface is determined by the surface normal. According to the invention, a precisely fitting driving surface or a contact surface corresponding to the driving surface is structurally simply achieved, in that the driving surface is configured just as well.
  • a comfortable guidance in an engagement rotational position of the positive-locking element can be achieved if the positive-locking element has at least one chamfer to support a postponement process.
  • a backlash-free attachment can be achieved and an overload of the device can be avoided if the device comprises a spring element for generating a clamping force on the tool.
  • the device comprises a spring element for generating a clamping force on the tool.
  • an operator a target torque of the device can be illustrated when a blocking force of the spring element is assigned to a desired torque of a fastener, in particular a screw.
  • a cost-saving device can be achieved if the centering element is designed as a fastening screw.
  • the spring element is designed as a disk spring, it can advantageously be produced cost-effectively and the pressure flange can be used for axially pressing the tool onto the drive shaft.
  • a sufficiently precise centering with sufficient stability is achievable if the diameter of the centering element is between 4 and 8 mm.
  • the invention relates to a system according to claim 11.
  • the form-fitting element is arranged radially outside the centering element. Therefore, a tool can be achieved, which can be fastened in a fastening operation on the drive shaft, which comprises a process independent of a centering process for determining the rotational position.
  • a secure positive connection between the tool and the drive shaft can be achieved if the form-locking element is associated with a corresponding positive-locking element of the drive shaft.
  • a particularly cost-interchangeable tool can be achieved if the form-locking element is formed as a recess.
  • the form-locking element is designed as a raised shape, which engages in a recess on the drive shaft.
  • FIG. 1 shows a hand tool 28 with an oscillatory drivable drive shaft 16 which is mounted on a ball bearing 30 and a needle bearing 32 in a representation in the illustration half removed housing 34 of the power tool 28.
  • the hand tool 28 includes an electric motor, not shown here, which drives an eccentric disc via a motor shaft into which a drive shaft 16 rotatably connected to the arm 36 engages, so that a rotational movement of the eccentric generates an oscillatory movement of the arm 36 and thus the drive shaft 16.
  • the power tool 28 has a device for attaching an axially attachable tool 14, which comprises a plate-shaped abutment flange 38, a fastening screw 42 and a plate spring formed as spring element 24.
  • the device is used for the rotationally fixed and axially fixed connection between the tool 14 and the drive shaft 16, so that the oscillating movement of the drive shaft 16 transmits in an oscillating pivoting movement 40 of the tool 14.
  • the abutment flange 38 has a circular abutment surface running perpendicular to the drive shaft 16, on which a total of twelve pin-shaped form-fitting elements 12 with a trapezoidal cross-section are distributed uniformly over an angular range given by the entire circumference.
  • a blind hole centering element 10 ( Fig. 2 ) is mounted with an internal thread, not shown here for receiving the fastening screw 42.
  • the form-locking elements 12 are arranged radially outside the centering element 10.
  • the radius 18 of the circle on which the interlocking elements 12 are arranged exceeds the radius 20 of the centering element 10 by four times.
  • the form-locking elements 12 have laterally driving surface 22, which extend with respect to the axis of rotation of the drive shaft 16 radially outwardly and in the axial direction. Furthermore, the form-locking elements 12 on a side facing away from the body of the power tool 28 edge on a chamfer 46 for supporting a postponement of the tool 14 ( FIG. 4 ).
  • the tool 14 is part of a diverse range of possible insert tools including dip saw blades, milling, grinding plates, and cutting tools.
  • a mounting portion 44 which is similar in all tools of the range, the tool 14 has twelve arranged in a circle, designed as recesses or holes form-fitting elements 12 ', which correspond to the interlocking elements 12 on the abutment flange 38.
  • the interlocking elements 12 ' have a shape that corresponds to the trapezoidal cross-section of the interlocking elements 12 ( FIG. 3 ).
  • the interlocking elements 12 engage through the interlocking elements 12 'and define a rotational position of the tool 14 relative to the drive shaft 16.
  • the device is due to the twelve-fold symmetry of the arrangement of the form-locking elements 12, 12 'suitable for twelve different rotational positions of the tool 14 set relative to the drive shaft 16, which differ by 30 ° from their adjacent rotational positions. Each rotational position corresponds to a different assignment between the positive-locking elements 12 and the positive-locking elements 12 '.
  • the tool 14 In the center of the fixing portion 44 and the circle on which the interlocking elements 12 'are arranged, the tool 14 has a round hole whose diameter is 6 mm and thus corresponds to the diameter of a shaft of the fastening screw 42.
  • a head 48 of the fastening screw 42 has a hexagonal recess for receiving a hexagonal wrench.
  • the tool 14 shifts in the direction of the abutment flange 38 via the spring element 24, which acts as a pressure flange, until the tool 14 comes into contact with the interlocking elements 12.
  • the operator can now determine the rotational position relative to the drive shaft 16 by turning the tool 14.
  • the tool 14 is thereby automatically guided by a contact force generated by the spring element 24 on the chamfers 46 of the form-locking elements 12 in one of the twelve rotational positions in which the tool 14 is fixable.
  • the operator continues to pull on the fastening screw 42 until the tool 14 is pressed against the contact surface of the abutment flange 38 by the spring element 24.
  • the spring element 24 Runs on block when a Target torque of the fastening screw 42 is reached, which is noticeable to the operator by a sudden increase of a torque necessary for rotating the fastening screw 42.
  • the spring element 24 then generates a clamping force, given essentially by the blocking force, with which the tool 14 is held without play on the abutment surface of the abutment flange 38.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Wood Science & Technology (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Harvester Elements (AREA)
  • Jigs For Machine Tools (AREA)
  • Manipulator (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Automatic Assembly (AREA)

Abstract

The arrangement comprises a centering element (10) and a press fitting unit (12, 12', 44) for the axial joining of a tool (14) to a power driven device (28) with an oscillating drive shaft (16). The centering element (10) assists in the positioning of the tool (14) in relation to the drive shaft (16) and the press fitting unit (12, 12', 44) is used for locking the tool (14) in the appropriate position. The press fitting unit (12, 12', 44) is designed as a row of cylindrical projections (12) arranged around the outer area of a flange (38) and engaging with complementary openings (12') at the rear end of the tool (44).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von eine Handwerkzeugmaschine mit einer Vorrichtung zum Befestigen eines axial aufsteckbaren Werkzeugs an einer oszillierend antreibbaren Antriebswelle einer Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 1, und einem Werkzeug nach dem Oberbegriff des Anspruchs 14.The invention relates to a hand tool machine with a device for fastening an axially attachable tool to an oscillating drivable drive shaft of a hand tool according to the preamble of claim 1, and a tool according to the preamble of claim 14.

Aus der EP 1 213 107 A1 ist eine Vorrichtung zum Befestigen eines axial aufsteckbaren Werkzeugs an einer oszillierend antreibbaren Antriebswelle einer Handwerkzeugmaschine bekannt. Die Vorrichtung umfasst eine Zentrierausnehmung und sechs als Spitzen in einem Umriss der Zentrierausnehmung ausgebildete Formschlusselemente, die daher Teil der Zentrierausnehmung sind.From the EP 1 213 107 A1 a device for fastening an axially attachable tool to an oscillating drivable drive shaft of a power tool is known. The device comprises a centering recess and six positive locking elements designed as tips in an outline of the centering recess, which are therefore part of the centering recess.

Die US 2003/176147 A1 offenbart einen Winkelschleifer mit einer Werkzeugaufnahme, die einen Bund, der als Zentrierelement dient, und drei Bolzen, die als Formschlusselemente dienen, aufweist. Die Werkzeugaufnahme ist zu einem Befestigen eines Werkzeugs an einer um eine Rotationsachse rotierenden Antriebswelle vorgesehen. Die Bolzen greifen in einem montierten Zustand in Ausnehmungen des Werkzeugs formschlüssig ein. Ferner sind die Bolzen zylinderförmig ausgestaltet und weisen einen runden Querschnitt und damit eine gekrümmte Mitnahmefläche auf.The US 2003/176147 A1 discloses an angle grinder with a tool holder, which has a collar, which serves as a centering element, and three bolts, which serve as positive locking elements. The tool holder is provided for fastening a tool to a drive shaft rotating about a rotation axis. The bolts engage positively in a mounted state in recesses of the tool. Furthermore, the bolts are cylindrical and have a round cross section and thus a curved driving surface.

Die DE 199 14 956 A1 offenbart eine Werkzeugaufnahme eines Schleifgeräts zu einer Befestigung eines axial aufsteckbaren Werkzeugs an dem Schleifgerät. Die Werkzeugaufnahme weist eine Zwischenflanschplatte mit zwei Formschlusselementen auf. Die Formschlusselemente sind dazu vorgesehen, in einem montierten Zustand in als Rastöffnungen ausgebildete Ausnehmungen des Werkzeugs einzugreifen. Die Formschlusselemente sind zylinderförmig ausgestaltet und weisen einen runden Querschnitt und damit eine gekrümmte Mitnahmefläche auf.The DE 199 14 956 A1 discloses a tool holder of a grinder for attachment of an axially attachable tool to the grinder. The tool holder has an intermediate flange plate with two positive locking elements. The interlocking elements are intended to intervene in an assembled state formed in recesses of the tool as locking openings. The interlocking elements are cylindrical and have a round cross section and thus a curved driving surface.

Die US 3 943 934 A offenbart eine Knochensäge mit einer Vorrichtung, die einen Pin und Formschlusselemente zum Befestigen eines Werkzeugs an einer oszillierenden Antriebswelle aufweist. Die Formschlusselemente sind zum Festlegen einer Drehlage des Werkzeugs relativ zur Antriebswelle vorgesehen.The US 3,943,934 A discloses a bone saw with a device having a pin and interlocking elements for attaching a tool to an oscillating drive shaft. The interlocking elements are provided for fixing a rotational position of the tool relative to the drive shaft.

Die EP 0 554 929 A1 offenbart eine Werkzeugaufnahme, die zu einer Befestigung einer Klinge an einer chirurgischen Säge vorgesehen ist. Die Werkzeugaufnahme weist eine Spannfläche auf, die mehrere Stifte aufweist, die dazu vorgesehen sind, mit Ausnehmungen der Klinge zu korrespondieren und in einem Betriebszustand eine Oszillationsbewegung einer Antriebswelle der chirurgischen Säge auf die Klinge zu übertragen. Die Oberbegriffe der unabhängigen Ansprüche 1 und 14 basieren auf diesem Document.The EP 0 554 929 A1 discloses a tool holder intended for attachment of a blade to a surgical saw. The tool holder has a clamping surface having a plurality of pins which are adapted to correspond to recesses of the blade and to transmit in an operating state an oscillating movement of a drive shaft of the surgical saw on the blade. The preambles of independent claims 1 and 14 are based on this document.

Die US 2002/116023 A1 offenbart ein Sägeblatt, das an einem vorderen Ende eine Verzahnung und an einem hinteren Ende einen Aufnahmebereich zu einer Befestigung an einer Werkzeugaufnahme einer Handwerkzeugmaschine aufweist. Der Aufnahmebereich umfasst eine von einem Schlitz gebildete Zentrierausnehmung und mehrere, von runden Ausnehmungen gebildete Formschlusselemente.The US 2002/116023 A1 discloses a saw blade having at a front end a toothing and at a rear end a receiving area for attachment to a tool holder of a power tool. The receiving region comprises a centering recess formed by a slot and a plurality of form-locking elements formed by round recesses.

Vorteile der ErfindungAdvantages of the invention

Die Erfindung betrifft eine Handwerkzeugmaschine gemäß Anspruch 1 mit einer Vorrichtung mit einem Zentrierelement und wenigstens einem Formschlusselement zum Befestigen eines axial aufsteckbaren Werkzeugs an einer oszillierend antreibbaren Antriebswelle einer Handwerkzeugmaschine, wobei das Zentrierelement zum Zentrieren des Werkzeugs zur Antriebswelle und das Formschlusselement zum Festlegen einer Drehlage des Werkzeugs relativ zur Antriebswelle vorgesehen ist.The invention relates to a hand tool according to claim 1 with a device having a centering element and at least one positive locking element for attaching an axially attachable tool to an oscillating drivable drive shaft of a power tool, wherein the centering for centering the tool to the drive shaft and the interlocking element for fixing a rotational position of the tool is provided relative to the drive shaft.

Es wird vorgeschlagen, dass das Formschlusselement radial außerhalb des Zentrierelements angeordnet ist. Dadurch kann eine vorteilhafte Trennung einer Zentrierfunktion von einer Festlegungsfunktion und/oder von einer Drehmomentübertragungsfunktion erreicht werden, so dass ein komfortablerer Befestigungsvorgang erreichbar ist. Durch das radial außen angeordnete Formschlusselement kann ein vorteilhaft großer Hebel zur Drehmomentübertragung bei vergleichsweise geringer Materialbelastung im Bereich des Formschlusselements erreicht werden, ohne in einem Zentriervorgang an Präzision zu verlieren.It is proposed that the positive-locking element is arranged radially outside the centering element. As a result, an advantageous separation of a centering function from a fixing function and / or from a torque transmission function can be achieved so that a more comfortable fastening operation can be achieved. By means of the form-fitting element arranged radially on the outside, an advantageously large lever for transmitting torque can be achieved with comparatively little material load in the area of the positive-locking element, without losing precision in a centering operation.

Unter "vorgesehen" soll in diesem Zusammenhang auch "ausgelegt" und "ausgestattet" verstanden werden.In this context, "provided" should also be understood to mean "designed" and "equipped".

In einer Ausgestaltung der Erfindung wird vorgeschlagen, dass das Zentrierelement einen kreisförmigen Querschnitt aufweist. Dadurch kann erreicht werden, dass nach dem Zentriervorgang die Drehlage frei wählbar und unabhängig vom Zentriervorgang ist. Dabei kann das Zentrierelement sowohl als kreisförmige Ausnehmung als auch als Bolzen mit einem kreisförmigen Querschnitt ausgebildet sein.In one embodiment of the invention, it is proposed that the centering element has a circular cross-section. It can thereby be achieved that after the centering, the rotational position is freely selectable and independent of the centering. In this case, the centering element can be formed both as a circular recess and as a bolt with a circular cross-section.

Ein robuster und sicherer Formschluss kann erreicht werden, wenn das Formschlusselement zum Eingriff in eine Ausnehmung vorgesehen ist. Ein sicherer Halt des Formschlusselements ist erreichbar, wenn das Formschlusselement zumindest eine sich in axialer Richtung erstreckende Anlagefläche aufweist.A robust and secure positive connection can be achieved if the form-locking element is provided for engagement in a recess. A secure hold of the positive-locking element can be achieved if the positive-locking element has at least one contact surface extending in the axial direction.

Ist das Formschlusselement zur Befestigung des Werkzeugs in zumindest drei Drehlagen vorgesehen, kann die Vorrichtung vorteilhaft zur Befestigung eines Werkzeugs mit drei möglichen Arbeitslagen, insbesondere eines Werkzeugs mit einer dreizähligen Symmetrie, beispielsweise einer Dreiecks-Schleifplatte, geeignet sein.If the interlocking element is provided for fastening the tool in at least three rotational positions, the device can advantageously be suitable for fastening a tool having three possible working positions, in particular a tool having a threefold symmetry, for example a triangular grinding plate be.

Gemäß der Erfindung ist die Vorrichtung zur Befestigung eines Werkzeugs mit einer vierzähligen Symmetrie oder mit Arbeitslagen, die sich um 90° unterscheiden vorgesehen. Beispielhaft sei ein Tauchsägeblatt genannt.According to the invention, the device is provided for fixing a tool having a fourfold symmetry or working positions differing by 90 °. As an example, a diving saw blade is called.

Eine universell für eine Vielzahl von verschiedenartigen Werkzeugen einsetzbare Vorrichtung wird erfindungsgemäß dadurch erreicht, dass das Formschlusselement zur Befestigung des Werkzeugs in zwölf Drehlagen vorgesehen ist. Insbesondere dann, wenn die Drehlagen über einen Winkelbereich gleichmäßig verteilt sind, ist eine flexible Einstellung bei gleichzeitig sicherer Drehmomentübertragung erreichbar.A device that can be universally used for a variety of different tools is inventively achieved in that the positive locking element is provided for fixing the tool in twelve rotational positions. In particular, when the rotational positions are evenly distributed over an angular range, a flexible adjustment while safe torque transmission is achievable.

Eine drehsymmetrische Vorrichtung ist erreichbar, wenn der Winkelbereich 360° beträgt. Dabei ist im Fall einer zwölfzählingen Drehsymmetrie eine vorteilhaft flexibel für Werkzeuge mit einer dreizähligen Symmetrie und mit einer vierzähligen Symmetrie einsetzbare Vorrichtung erreichbar, die insbesondere sowohl zur Befestigung einer Dreiecks-Schleifplatte als auch eines Tauchsägeblatts geeignet ist.A rotationally symmetrical device is achievable if the angular range is 360 °. In this case, in the case of a twelve-fold rotational symmetry, a device which can advantageously be used flexibly for tools with a threefold symmetry and with a fourfold symmetry can be achieved, which is particularly suitable both for fastening a triangular sanding plate and a dipping saw blade.

Eine materialbelastungsarme Drehmomentübertragung bei gleichzeitig präziser Zentrierung des Werkzeugs kann erreicht werden, wenn ein einer Lage des Formschlusselements zugeordneter Radius mehr als doppelt so groß ist wie ein Radius des Zent-rierelements. Sind mehrere Formschlusselemente auf einem Kreis angeordnet, kann den Formschlusselementen der Radius des Kreises zugeordnet werden, ansonsten der radiale Abstand des Formschlusselements oder einer Kante desselben von einer Drehachse der Antriebswelle.A low-torque torque transmission with simultaneous precise centering of the tool can be achieved if a position of the form-fitting element associated radius is more than twice as large as a radius of the centering element. If a plurality of interlocking elements arranged on a circle, the interlocking elements of the radius of the circle can be assigned, otherwise the radial distance of the interlocking element or an edge thereof from a rotational axis of the drive shaft.

Ein kostengünstiges und sicheres Formschlusselement ist erreichbar, wenn das Formschlusselement stiftförmig ausgebildet ist.A cost-effective and secure form-fitting element can be achieved if the positive-locking element is formed pin-shaped.

Weist die Vorrichtung eine Vielzahl von gleichförmigen, gleichmäßig auf einem Kreis um das Zentrierelement verteilten Formschlusselementen auf, kann eine asymmetrische Belastung der Vorrichtung bei einer Drehmomentübertragung vermieden werde.If the device has a multiplicity of uniform form-locking elements distributed uniformly on a circle around the centering element, asymmetrical loading of the device during torque transmission can be avoided.

Eine punktuelle Materialbelastung kann vermieden werden, wenn das Formschlusselement zumindest eine im Wesentlichen in Umfangsrichtung gerichtete Mitnahmefläche aufweist. Die Richtung der Fläche ist durch die Flächennormale bestimmt. Erfindungsgemäß wird konstruktiv einfach eine passgenaue Mitnahmefläche bzw. eine zur Mitnahmefläche korrespondierende Anlagefläche erreicht, indem die Mitnahmefläche eben ausgestaltet ist.A punctual material load can be avoided if the positive-locking element has at least one substantially driving surface directed in the circumferential direction. The direction of the surface is determined by the surface normal. According to the invention, a precisely fitting driving surface or a contact surface corresponding to the driving surface is structurally simply achieved, in that the driving surface is configured just as well.

Eine komfortable Führung in eine Eingriffsdrehlage des Formschlusselements ist erreichbar, wenn das Formschlusselement zumindest eine Fase zum Unterstützen eines Aufschubvorgangs aufweist.A comfortable guidance in an engagement rotational position of the positive-locking element can be achieved if the positive-locking element has at least one chamfer to support a postponement process.

Eine spielfreie Befestigung kann erreicht und eine Überlastung der Vorrichtung kann vermieden werden, wenn die Vorrichtung ein Federelement zum Erzeugen einer Klemmkraft auf das Werkzeug umfasst. Dabei kann einem Bediener ein Sollmoment der Vorrichtung verdeutlicht werden, wenn eine Blockkraft des Federelements einem Sollmoment eines Befestigungselements, insbesondere einer Schraube, zugeordnet ist.A backlash-free attachment can be achieved and an overload of the device can be avoided if the device comprises a spring element for generating a clamping force on the tool. In this case, an operator a target torque of the device can be illustrated when a blocking force of the spring element is assigned to a desired torque of a fastener, in particular a screw.

Eine kostensparende Vorrichtung kann erreicht werden, wenn das Zentrierelement als Befestigungsschraube ausgebildet ist.A cost-saving device can be achieved if the centering element is designed as a fastening screw.

Ist das Federelement als Tellerfeder ausgebildet, kann es vorteilhaft kostengünstig herstellbar und der Anpressflansch zum axialen Anpressen des Werkzeugs an die Antriebswelle nutzbar sein.If the spring element is designed as a disk spring, it can advantageously be produced cost-effectively and the pressure flange can be used for axially pressing the tool onto the drive shaft.

Eine hinreichend präzise Zentrierung bei ausreichender Stabilität ist erreichbar, wenn der Durchmesser des Zentrierelements zwischen 4 und 8 mm beträgt.A sufficiently precise centering with sufficient stability is achievable if the diameter of the centering element is between 4 and 8 mm.

Ferner betrifft die Erfindung ein system gemaß Anspruch 11.Furthermore, the invention relates to a system according to claim 11.

Das Formschlusselement ist radial außerhalb des Zentrierelements angeordnet. Dadurch kann ein Werkzeug erreicht werden, das in einem Befestigungsvorgang an der Antriebswelle befestigbar ist, der einen von einem Zent-riervorgang unabhängigen Vorgang zur Bestimmung der Drehlage umfasst.The form-fitting element is arranged radially outside the centering element. Thereby, a tool can be achieved, which can be fastened in a fastening operation on the drive shaft, which comprises a process independent of a centering process for determining the rotational position.

Eine sichere formschlüssige Verbindung zwischen dem Werkzeug und der Antriebswelle ist erreichbar, wenn dem Formschlusselement ein korrespondierendes Formschlusselement der Antriebswelle zugeordnet ist.A secure positive connection between the tool and the drive shaft can be achieved if the form-locking element is associated with a corresponding positive-locking element of the drive shaft.

Ein besonders kostengünstiges auswechselbares Werkzeug kann erreicht werden, wenn das Formschlusselement als Ausnehmung ausgebildet ist. Es sind jedoch auch Ausgestaltungen der Erfindung denkbar, in denen das Formschlusselement als erhabene Ausformung ausgebildet ist, die in eine Ausnehmung an der Antriebswelle eingreift.A particularly cost-interchangeable tool can be achieved if the form-locking element is formed as a recess. However, embodiments of the invention are also conceivable in which the form-locking element is designed as a raised shape, which engages in a recess on the drive shaft.

Zeichnungdrawing

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Es zeigen:

Fig. 1
eine Handwerkzeugmaschine mit einem Zentrierelement und einem Formschlusselement zum Befestigen eines axial aufsteckbaren Werkzeugs,
Fig. 2
die Handwerkzeugmaschine aus Figur.1 in einer Konfiguration eines Zentriervorgangs,
Fig. 3
einen Ausschnitt des Werkzeugs aus den Figuren 1 und 2 und
Fig. 4
ein Anlageflansch der Handwerkzeugmaschine aus den Figuren 1 bis 3
Show it:
Fig. 1
a hand tool with a centering element and a positive locking element for fastening an axially attachable tool,
Fig. 2
the hand tool Figur.1 in a Configuration of a centering process,
Fig. 3
a section of the tool from the FIGS. 1 and 2 and
Fig. 4
an investment flange of the power tool from the FIGS. 1 to 3

Beschreibung der AusführungsbeispieleDescription of the embodiments

Figur 1 zeigt eine Handwerkzeugmaschine 28 mit einer oszillierend antreibbaren Antriebswelle 16, die über ein Kugellager 30 und ein Nadellager 32 in einem in der Darstellung zur Hälfte entfernten Gehäuse 34 der Handwerkzeugmaschine 28 gelagert ist. Die Handwerkzeugmaschine 28 umfasst einen hier nicht dargestellten Elektromotor, der über eine Motorwelle eine Exzenterscheibe antreibt, in die ein mit der Antriebswelle 16 drehfest verbundener Arm 36 eingreift, so dass eine Drehbewegung der Exzenterscheibe eine oszillatorische Bewegung des Arms 36 und damit der Antriebswelle 16 erzeugt. FIG. 1 shows a hand tool 28 with an oscillatory drivable drive shaft 16 which is mounted on a ball bearing 30 and a needle bearing 32 in a representation in the illustration half removed housing 34 of the power tool 28. The hand tool 28 includes an electric motor, not shown here, which drives an eccentric disc via a motor shaft into which a drive shaft 16 rotatably connected to the arm 36 engages, so that a rotational movement of the eccentric generates an oscillatory movement of the arm 36 and thus the drive shaft 16.

An einem aus dem Gehäuse 34 herausragenden Ende der Antriebswelle 16 weist die Handwerkzeugmaschine 28 eine Vorrichtung zum Befestigen eines axial aufsteckbaren Werkzeugs 14 auf, die einen tellerförmigen Anlageflansch 38, eine Befestigungsschraube 42 und ein als Tellerfeder ausgebildetes Federelement 24 umfasst. Die Vorrichtung dient zur drehfesten und axial festen Verbindung zwischen dem Werkzeug 14 und der Antriebswelle 16, so dass sich die oszillierende Bewegung der Antriebswelle 16 in eine oszillierende Schwenkbewegung 40 des Werkzeugs 14 überträgt.At a projecting from the housing 34 end of the drive shaft 16, the power tool 28 has a device for attaching an axially attachable tool 14, which comprises a plate-shaped abutment flange 38, a fastening screw 42 and a plate spring formed as spring element 24. The device is used for the rotationally fixed and axially fixed connection between the tool 14 and the drive shaft 16, so that the oscillating movement of the drive shaft 16 transmits in an oscillating pivoting movement 40 of the tool 14.

Der Anlageflansch 38 weist eine senkrecht zur Antriebswelle 16 verlaufende kreisförmige Anlagefläche auf, auf der insgesamt zwölf stiftförmige Formschlusselemente 12 mit einem trapezförmigen Querschnitt gleichmäßig über einen durch den gesamten Kreisumfang gegebenen Winkelbereich verteilt angeordnet sind. In der Mitte des Anlageflanschs 38 ist ein als Sacklochbohrung ausgebildetes Zentrierelement 10 (Fig. 2) mit einem hier nicht dargestellten Innengewinde zur Aufnahme der Befestigungsschraube 42 angebracht.The abutment flange 38 has a circular abutment surface running perpendicular to the drive shaft 16, on which a total of twelve pin-shaped form-fitting elements 12 with a trapezoidal cross-section are distributed uniformly over an angular range given by the entire circumference. In the middle of the abutment flange 38 is designed as a blind hole centering element 10 ( Fig. 2 ) is mounted with an internal thread, not shown here for receiving the fastening screw 42.

Die Formschlusselemente 12 sind radial außerhalb des zentrierelements 10 angeordnet. Der Radius 18 des Kreises, auf dem die Formschlusselemente 12 angeordnet sind, übertrifft den Radius 20 des Zentrierelements 10 um das Vierfache.
Die Formschlusselemente 12 weisen seitlich Mitnahmefläche 22 auf, die sich in Bezug auf die Drehachse der Antriebswelle 16 radial nach außen und in axialer Richtung erstrecken. Ferner weisen die Formschlusselemente 12 an einer dem Körper der Handwerkzeugmaschine 28 abgewandten Kante eine Fase 46 zum Unterstützen eines Aufschubvorgangs des Werkzeugs 14 auf (Figur 4).The form-locking elements 12 are arranged radially outside the centering element 10. The radius 18 of the circle on which the interlocking elements 12 are arranged, exceeds the radius 20 of the centering element 10 by four times.
The form-locking elements 12 have laterally driving surface 22, which extend with respect to the axis of rotation of the drive shaft 16 radially outwardly and in the axial direction. Furthermore, the form-locking elements 12 on a side facing away from the body of the power tool 28 edge on a chamfer 46 for supporting a postponement of the tool 14 ( FIG. 4 ).

Das Werkzeug 14 ist Teil eines vielfältigen Sortiments von möglichen Einsatzwerkzeugen, das Tauchsägeblätter, Fräsen, Schleifplatten und Schneidewerkzeuge umfasst. In einem Befestigungsabschnitt 44, der bei allen Werkzeugen des Sortiments gleichartig ist, weist das Werkzeug 14 zwölf in einem Kreis angeordnete, als Ausnehmungen bzw. Löcher ausgebildete Formschlusselemente 12' auf, die zu den Formschlusselementen 12 am Anlageflansch 38 korrespondieren. Die Formschlusselemente 12' haben eine Form, die dem trapezförmigen Querschnitt der Formschlusselemente 12 entspricht (Figur 3).The tool 14 is part of a diverse range of possible insert tools including dip saw blades, milling, grinding plates, and cutting tools. In a mounting portion 44, which is similar in all tools of the range, the tool 14 has twelve arranged in a circle, designed as recesses or holes form-fitting elements 12 ', which correspond to the interlocking elements 12 on the abutment flange 38. The interlocking elements 12 'have a shape that corresponds to the trapezoidal cross-section of the interlocking elements 12 ( FIG. 3 ).

In einem montierten Zustand des Werkzeugs 14 greifen die Formschlusselemente 12 durch die Formschlusselemente 12' und legen eine Drehlage des Werkzeugs 14 relativ zur Antriebswelle 16 fest. Dabei ist die Vorrichtung durch die zwölfzählige Symmetrie der Anordnung der Formschlusselemente 12, 12' dazu geeignet, zwölf verschiedene Drehlagen des Werkzeugs 14 relativ zur Antriebswelle 16 festzulegen, die sich jeweils um 30° von ihren benachbarten Drehlagen unterscheiden. Jeder Drehlage entspricht eine unterschiedliche Zuordnung zwischen den Formschlusselementen 12 und den Formschlusselementen 12'.In an assembled state of the tool 14, the interlocking elements 12 engage through the interlocking elements 12 'and define a rotational position of the tool 14 relative to the drive shaft 16. The device is due to the twelve-fold symmetry of the arrangement of the form-locking elements 12, 12 'suitable for twelve different rotational positions of the tool 14 set relative to the drive shaft 16, which differ by 30 ° from their adjacent rotational positions. Each rotational position corresponds to a different assignment between the positive-locking elements 12 and the positive-locking elements 12 '.

Im Zentrum des Befestigungsabschnitts 44 und des Kreises, auf dem die Formschlusselemente 12' angeordnet sind, weist das Werkzeug 14 ein rundes Loch auf, dessen Durchmesser 6 mm beträgt und damit dem Durchmesser eines Schafts der Befestigungsschraube 42 entspricht.In the center of the fixing portion 44 and the circle on which the interlocking elements 12 'are arranged, the tool 14 has a round hole whose diameter is 6 mm and thus corresponds to the diameter of a shaft of the fastening screw 42.

Während einer Montage schiebt ein Bediener die mit dem Federelement 24 versehene Befestigungsschraube 42 durch das runde Loch des Befestigungsabschnitts 44 und führt die Befestigungsschraube 42 in das als Sacklochbohrung ausgebildete Zentrierelement 10 im Anlageflansch 38 ein. Ein Kopf 48 der Befestigungsschraube 42 weist eine sechseckige Ausnehmung zur Aufnahme eines Sechskantschlüssels auf.During assembly, an operator pushes the fastening screw 42 provided with the spring element 24 through the round hole of the fastening section 44 and inserts the fastening screw 42 into the centering element 10 in the abutment flange 38 which is designed as a blind hole. A head 48 of the fastening screw 42 has a hexagonal recess for receiving a hexagonal wrench.

Durch ein Einschrauben der Befestigungsschraube 42 in das Zentrierelement 10 verschiebt sich über das als Anpressflansch wirkende Federelement 24 das Werkzeug 14 in Richtung des Anlageflanschs 38, bis das Werkzeug 14 in Berührung mit den Formschlusselementen 12 kommt. Der Bediener kann nun durch Drehen des Werkzeugs 14 die Drehlage relativ zur Antriebswelle 16 bestimmen. Das Werkzeug 14 wird dabei durch eine von dem Federelement 24 erzeugte Anpresskraft über die Fasen 46 der Formschlusselemente 12 selbsttätig in eine der zwölf Drehlagen gelenkt, in denen das Werkzeug 14 fixierbar ist. Dabei wird eine Zentrierung des Werkzeugs 14 durch das Ineinandergreifen der Formschlusselemente 12, 12' weiter präzisiert, und zwar insbesondere durch das Anliegen einer radial nach innen weisenden Seitenfläche der Formschlusselemente 12 an einem radial inneren Rand der Formschlusselemente 12'.By screwing the fastening screw 42 into the centering element 10, the tool 14 shifts in the direction of the abutment flange 38 via the spring element 24, which acts as a pressure flange, until the tool 14 comes into contact with the interlocking elements 12. The operator can now determine the rotational position relative to the drive shaft 16 by turning the tool 14. The tool 14 is thereby automatically guided by a contact force generated by the spring element 24 on the chamfers 46 of the form-locking elements 12 in one of the twelve rotational positions in which the tool 14 is fixable. In this case, a centering of the tool 14 by the engagement of the interlocking elements 12, 12 'further specified, in particular by the concern of a radially inwardly facing side surface of the interlocking elements 12 at a radially inner edge of the interlocking elements 12'.

Sind die Formschlusselemente 12 mit den Formschlusselementen 12' zum Eingriff gekommen, zieht der Bediener die Befestigungsschraube 42 weiter an, bis das Werkzeug 14 durch das Federelement 24 an die Anlagefläche des Anlageflanschs 38 angepresst wird. Das Federelement 24 Läuft auf Block, wenn ein Sollmoment der Befestigungsschraube 42 erreicht ist, was für den Bediener durch einen schlagartigen Anstieg eines zum Drehen der Befestigungsschraube 42 nötigen Drehmoments spürbar ist. Das Federelement 24 erzeugt dann eine im Wesentlichen durch die Blockkraft gegebene Klemmkraft, mit der das Werkzeug 14 spielfrei auf der Anlagefläche des Anlageflanschs 38 gehalten wird.If the interlocking elements 12 come into engagement with the interlocking elements 12 ', the operator continues to pull on the fastening screw 42 until the tool 14 is pressed against the contact surface of the abutment flange 38 by the spring element 24. The spring element 24 Runs on block when a Target torque of the fastening screw 42 is reached, which is noticeable to the operator by a sudden increase of a torque necessary for rotating the fastening screw 42. The spring element 24 then generates a clamping force, given essentially by the blocking force, with which the tool 14 is held without play on the abutment surface of the abutment flange 38.

Claims (11)

  1. Portable power tool having an apparatus with a centring element (10) and form-fitting elements (12) for fastening an axially pluggable tool (14) on a drive shaft (16), which is driveable in an oscillating, manner, of the portable power tool (28), wherein the centring element (10) is provided to centre the tool (14) with respect to the drive shaft (16) and the form-fitting elements (12) are provided to define a rotary position of the tool (14) in relation to the drive shaft (16), wherein the form-fitting elements (12) are arranged radially outside the centring element (10), wherein the form-fitting elements (12) each have at least one driving surface (22) directed substantially in the circumferential direction, wherein the form-fitting elements (12) are arranged in a manner having four-fold symmetry, wherein the form-fitting elements (12) are uniform and are distributed regularly on a circle around the centring element (10), wherein the formfitting elements (12) are formed in a pin-like manner, characterized in that the driving surfaces (22) are configured in a planar manner and the form-fitting elements (12) are arranged in twelve-fold symmetry, wherein the form-fitting elements (12) are provided to fasten the tool (14) in twelve different rotary positions with respect to the drive shaft (16), which each differ by 30° from their adjacent rotary positions.
  2. Portable power tool according to Claim 1, characterized in that the centring element (10) has a circular cross section.
  3. Portable power tool according to either of the preceding claims, characterized in that the form-fitting elements (12) are provided to engage in a recess (12').
  4. Portable power tool according to one of the preceding claims, characterized in that the rotary positions are distributed regularly over an angular range.
  5. Portable power tool according to Claim 4, characterized in that the angular range is 360°.
  6. Portable power tool according to one of the preceding claims, characterized in that a radius (18) assigned to one position of the form-fitting elements (12) is more than twice as large as a radius (20) of the centring element (10).
  7. Portable power tool according to one of the preceding claims, characterized in that the form-fitting elements (12) have at least one bevel (46) for supporting a push-on operation.
  8. Portable power tool , according to one or the preceding claims, characterized by a spring element (24) for producing a clamping force on the tool (14).
  9. Portable power tool at least according to Claim 8, characterized in that a blocking force of the spring element (24) is associated with a desired torque of a fastening screw (42).
  10. Portable power tool according to one of the preceding claims, characterized in that the diameter of the centring element (10) is between 4 and 8 mm.
  11. System having a portable power tool according to one of Claims 1 to 10 and having a tool having a centring element (10) and form-fitting elements (12') for axially plugging and fastening on a drive shaft (16), which is driveable is an oscillating manner, of the portable power tool (28), wherein the centring element (10) is provided for centring with respect to the drive shaft (16) and the form-fitting elements (12') of the tool (14) are provided to define a rotary position in relation to the drive shaft (16), wherein the form-fitting elements (12') of the tool (14) are arranged radially outside the centring element (10) and are provided to correspond to form-fitting elements (12) of the portable power tool, wherein the form-fitting elements (12) of the tool (14), are uniform and are distributed regularly on a circle around the centring element (10), wherein the form-flitting elements (12') of the tool (14) are in the form of recesses, wherein the form-fitting elements (12') of the tool (14) are provided to fasten the tool (14') in twelve rotary positions and the form-fitting elements (12') of the tool (14) are arranged in a manner having four-fold symmetry, wherein, as a result of a twelve-fold symmetry of the arrangement of, the form-fitting elements (12') of the tool (14), these are suitable for defining twelve different rotary positions of the tool (14) relative to the drive shaft (16), which each differ by from their adjacent rotary positions.
EP09016052.4A 2004-10-19 2005-08-23 Hand-held machine tool Expired - Lifetime EP2172317B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410050798 DE102004050798A1 (en) 2004-10-19 2004-10-19 Device for fastening a tool to an oscillating drivable drive shaft of a hand tool machine
EP20050777659 EP1819490B1 (en) 2004-10-19 2005-08-23 Device for fixing a tool on a drive shaft of a hand-held machine tool, which can be driven in an oscillating manner

Related Parent Applications (2)

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EP05777659.3 Division 2005-08-23
EP20050777659 Division EP1819490B1 (en) 2004-10-19 2005-08-23 Device for fixing a tool on a drive shaft of a hand-held machine tool, which can be driven in an oscillating manner

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EP2172317A1 EP2172317A1 (en) 2010-04-07
EP2172317B1 EP2172317B1 (en) 2013-07-03
EP2172317B2 true EP2172317B2 (en) 2017-01-25

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EP20050777659 Expired - Lifetime EP1819490B1 (en) 2004-10-19 2005-08-23 Device for fixing a tool on a drive shaft of a hand-held machine tool, which can be driven in an oscillating manner

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US (3) US8151679B2 (en)
EP (2) EP2172317B2 (en)
CN (1) CN101043987B (en)
AT (1) ATE457857T1 (en)
DE (4) DE102004050798A1 (en)
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DE102007018464A1 (en) 2007-04-19 2008-10-23 Robert Bosch Gmbh Motor driven machine tool
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CN101043987A (en) 2007-09-26
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US8640580B2 (en) 2014-02-04
DE202004021498U1 (en) 2008-06-26
US8151679B2 (en) 2012-04-10
ATE457857T1 (en) 2010-03-15
US20140123825A1 (en) 2014-05-08
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EP1819490B1 (en) 2010-02-17
CN101043987B (en) 2010-05-26
EP1819490A1 (en) 2007-08-22
US20080190259A1 (en) 2008-08-14
US9272435B2 (en) 2016-03-01
WO2006042768A1 (en) 2006-04-27
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ES2425424T3 (en) 2013-10-15
DE202005022105U1 (en) 2013-09-26

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