EP0739266A1 - Device on hand machine tools for rotary tool drive - Google Patents

Device on hand machine tools for rotary tool drive

Info

Publication number
EP0739266A1
EP0739266A1 EP95903257A EP95903257A EP0739266A1 EP 0739266 A1 EP0739266 A1 EP 0739266A1 EP 95903257 A EP95903257 A EP 95903257A EP 95903257 A EP95903257 A EP 95903257A EP 0739266 A1 EP0739266 A1 EP 0739266A1
Authority
EP
European Patent Office
Prior art keywords
tool
circumference
rotary
longitudinal side
tool holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95903257A
Other languages
German (de)
French (fr)
Other versions
EP0739266B1 (en
Inventor
Horst Wierspecker
Heinz Neubert
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0739266A1 publication Critical patent/EP0739266A1/en
Application granted granted Critical
Publication of EP0739266B1 publication Critical patent/EP0739266B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084—Rotating chucks or sockets
    • B25D17/088—Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0003—Details of shafts of percussive tool bits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0038—Locking members of special shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0038—Locking members of special shape
    • B25D2217/0049—Roll-shaped locking 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
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17042—Lost motion
    • Y10T279/17068—Rotary socket
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17666—Radially reciprocating jaws
    • Y10T279/17692—Moving-cam actuator
    • Y10T279/17743—Reciprocating cam sleeve
    • Y10T279/17752—Ball or roller jaws
    • 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
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/907—Tool or Tool with support including detailed shank

Definitions

  • the invention is based on a device
  • Such a device is known from EP-433 876 AI, the trapezoidal or rectangular rotary driving grooves on the tool shank and the corresponding rotating driving bars on the tool holder having a limited wear reserve on their rotating driving flanks.
  • the webs between the grooves or the strips in the receiving bore of the tool holder break away afterwards.
  • the rear flank of the trapezoidal or rectangular rotary driving grooves is subjected to hard torque impacts, particularly when tilting chisel work, which results in notch effects , which promotes a breakout of the strips on the tool holder and the webs between the grooves on the tool shank.
  • a tendon-shaped recess on the tool shank which lies opposite an essentially trapezoidal groove for rotary driving.
  • the tendon-shaped recess serves to improve the compatibility in that a tool shank designed in this way can be used in hand tool devices with turning driver strips of different widths on their tool holder.
  • the rotation is carried out on one side, almost exclusively on the rotational driving flank of the opposite groove in the drive direction, since the locking bodies of the tool holder absorb only a small amount of torque in the locking recesses assigned to them on the tool shank.
  • the device according to the invention is designed with the characterizing features of patent claim 1, wherein in addition to the at least two mutually at least approximately opposite rotary drivers, a further rotary driver with a chord-shaped outlet on at least one longitudinal side of the tool shaft or the tool holder is arranged in the circumferential area which is at least approximately opposite the axial locking.
  • This solution advantageously allows the wear reserve for the tool holder to be increased and the notch effect on the tool shank to be reduced or avoided altogether in this area due to the flat rotational driving.
  • Another5 advantage is that when clamping such tools, for example in the borehole, they are also loaded with a maximum load Reverse gear must be operated with an abruptly responding overload clutch.
  • FIG. 1 shows a tool holder of a rotary hammer with inserted tool in cross section in an enlarged view
  • FIG. 2 shows a longitudinal section through the front end of the tool holder according to II-II from FIG. 1
  • FIG. 3 shows the tool shank.
  • FIGS. 4 and 5, 6 and 7 and 8 and 9 show three further exemplary embodiments of a tool shank designed according to the invention in cross section and the correspondingly designed tool holder.
  • the device according to the invention on machine tools for the rotary driving of striking and / or drilling tools, in particular on impact drills and hammer drills or impact devices essentially consists of a tool holder 10 which can be driven in the direction of the arrow and a tool shaft 11 inserted therein of a tool 12 used for drilling and / or striking.
  • 1 shows a cross section through such a device as a first exemplary embodiment in connection with FIGS. 2 and 3.
  • FIG. 2 with its front end in longitudinal section does not form in FIG shown, according to WO 88/09245 known manner, the end of a hollow cylindrical, driven tool spindle of a rotary hammer, in which a striker is axially movably received, which is cyclically struck by a hammer mechanism of the rotary hammer on the end face of the tool shaft 1, which in the receiving bore 13th of the tool holder 10 is used.
  • the tool holder 10 has a radial opening 14 in which a locking body 15 is inserted.
  • the extending locking locking body 15 can be displaced radially outward in a manner not shown when the tool shaft 11 is inserted into the receiving bore 13 and, for the axial locking of the tool 10, snaps resiliently into an axially extending locking trough 16 incorporated in the tool shaft 11 by means of a locking sleeve.
  • the cylindrical locking body 15 is rounded at its axial ends.
  • the locking trough 16 is designed as a groove and already ends in front of the rear end of the tool shank 11 with a corresponding spherical curvature.
  • two rotary drivers are arranged in the opposite areas, one rotary driver consisting of a narrow trapezoidal rotary driver groove 17 running axially to the shaft end in the tool shaft 11 and a co-operating, axially extending rotary driver bar 18 in the receiving bore 13 of the tool holder.
  • the second rotary driver in the opposite region is formed from a wider rotary driver groove 19 in the tool shank 11 and a correspondingly wider rotary driver bar 20 of the tool holder 10 which engages therein.
  • a third rotary drive is located in the area opposite the axial lock.
  • This rotary drive is designed such that there the tool shank 11 has a chord-shaped recess 21 (flattening or section) which runs axially to the shank end and the tool holder 10 has an axially extending chord-shaped projection 22 in the corresponding circumferential region of the receiving bore 13.
  • This rotary driver does not have a radial flank for torque transmission like the other two rotary drivers, but a much larger area through the chord-shaped outlet to the circumference of the tool shank 11 and to the receiving bore 13 of the tool holder 10. This results in the surface pressure in this area and, as a result, the wear reduces, which has a positive effect in particular on the radial rotary driving flanks of the other two rotary drivers.
  • the rear flank of this rotary drive runs like a chord to the circumference of the tool shank 11 or to the receiving bore 13 of the tool holder 10 in order to absorb dangerous left-hand rotary impulses, in particular when chiseling work with a fixed tool holder.
  • the two mutually opposite rotary drivers which operate from the rotary driver grooves 17 and 19 and the rotary driver bars 187 and 20, are tendon-shaped on their areas facing away from the rotary driver surfaces to the circumference of the tool shaft 11 or to the receiving bore 13 tapered.
  • the rotational driving flank 21a, 22a of the third rotational driving 21, 22 is here perpendicularly below the axial lock 15, 16.
  • a wider axial locking with the locking body 15a and the cooperating locking trough 16a in the tool shank 11 is shown, this axial locking being offset on the circumference in the direction of the narrower rotary drive.
  • the third rotary driver opposite the axial lock is designed there in such a way that its torque-transmitting flank 21a forms an angle of at least 90 ° with the section 21b tapering to the circumference of the tool shank 11.
  • This third rotary driver is also offset in the direction of the narrower rotary driver 17, 18 in the circumferential direction, in order to make one possible to get uniform stress on the tool shank 11.
  • the two opposite, different width rotary drivers are arranged interchanged.
  • Exemplary embodiments are limited, since in particular the number and the shape of individual rotary drivers that are not opposite the axial locking can be freely selected.
  • the chord-shaped rotary driver in the area opposite the axial locking can also be used to improve the compatibility between the tool shank and the tool holder, for example by the tool shaver 11 in the exemplary embodiment according to FIG. 1 being inserted into a tool holder with a third on the rotary driver bar 22c indicated in dashed lines in FIG Projection 22 or in a tool holder 10 according to Figure 5 is used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Automatic Tool Replacement In Machine Tools (AREA)
  • Drilling And Boring (AREA)
  • Toys (AREA)
  • Manipulator (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Gripping On Spindles (AREA)
  • Earth Drilling (AREA)

Abstract

PCT No. PCT/DE94/01534 Sec. 371 Date Jul. 1, 1996 Sec. 102(e) Date Jul. 1, 1996 PCT Filed Dec. 24, 1994 PCT Pub. No. WO95/19243 PCT Pub. Date Jul. 20, 1995A device on hand-held tool-driving machines for the coupling of pounding and/or drilling tools is proposed, comprising at least three couplings and one axial locking feature, which are uniformly distributed over the circumference of the tool shank (11) and seating hole (13) of a tool holder (10). The couplings comprise recesses (17, 19, 21) on the tool shank (11) running axially to the shank end and also projections (18, 20, 22) on the circumference of the seating hole (13) running axially and engaging with the recesses. In order to avoid thrust-like overloads, it is proposed that the coupling (21, 22) in the circumferential area opposite the axial locking feature be designed/shaped such that its recess (21) and projection (22) on at least one longitudinal side run in chord-shaped fashion to the circumference of the tool shank (10) or the seating hole (13) of the tool holder (10) (FIG. 1).

Description

Einrichtung an Handwerkzeuσ aschinen zur Drehmitnahme von WerkzeugenInstallation on handicraft machines for turning tools
Stand der TechnikState of the art
Die Erfindung geht aus von einer Einrichtung anThe invention is based on a device
Handwerkzeugmaschinen zur Drehmitnahme von schlagenden und/oder bohrenden Werkzeugen nach dem Oberbegriff des Patentanspruchs 1 sowie von einem dabei verwendeten Werkzeug und Werkzeughalter.Hand machine tools for the rotary driving of striking and / or drilling tools according to the preamble of claim 1 and of a tool and tool holder used in the process.
Eine solche Einrichtung ist aus der EP- 433 876 AI bekannt, wobei die trapez- oder rechteckförmigen Drehmitnahmenuten am Werkzeugschaft und die entsprechenden Drehmitnahmeleisten am Werkzeughalter an ihren Drehmitnahmeflanken eine begrenzte Verschleißreserve haben. Insbesondere bei Werkzeugen mit großem Arbeitsdurchmesser und bei leistungsstarken Maschinen brechen danach die Stege zwischen den Nuten bzw. die Leisten in der Aufnahmebohrung des Werkzeughalters weg. Außerdem wird die rückwärtige Flanke der trapez- oder rechteckförmigen Drehmitnahmenuten insbesondere bei verkanteten Meißelarbeiten mit harten Drehmomentstoßen belastet, was Kerbwirkungen zur Folge hat, die ein Ausbrechen der Leisten am Werkzeughalter und der Stege zwischen den Nuten am Werkzeugschaft begünstigt.Such a device is known from EP-433 876 AI, the trapezoidal or rectangular rotary driving grooves on the tool shank and the corresponding rotating driving bars on the tool holder having a limited wear reserve on their rotating driving flanks. Especially with tools with a large working diameter and with high-performance machines, the webs between the grooves or the strips in the receiving bore of the tool holder break away afterwards. In addition, the rear flank of the trapezoidal or rectangular rotary driving grooves is subjected to hard torque impacts, particularly when tilting chisel work, which results in notch effects , which promotes a breakout of the strips on the tool holder and the webs between the grooves on the tool shank.
Aus der DE 42 11 533 AI ist ferner eine sehnenförmige Ausnehmung am Werkzeugschaft bekannt, die einer im wesentlichen trapezförmigen Nut zur Drehmitnahme gegenüberliegt. Die sehnenförmige Ausnehmung dient zur Verbesserung der Kompatibilität, indem ein derart ausgebildeter Werkzeugschaft in Handwerkzeuggeräten mit verschieden breiten Drehmitnahmeleisten an ihren Werkzeughalter einsetzbar ist. Die Drehtmitnahme erfolgt hier jedoch sehr einseitig, nahezu ausschließlich an der in Antriebsrichtung liegenden Drehmitnahmeflanke der gegenüberliegenden Nut, da die Verriegelungskörper des Werzeughalters in den ihnen zugeordneten Verriegelungsmulden am Werkzeugschaft nur ein geringes Drehmoment aufnehmen.From DE 42 11 533 AI a tendon-shaped recess on the tool shank is also known, which lies opposite an essentially trapezoidal groove for rotary driving. The tendon-shaped recess serves to improve the compatibility in that a tool shank designed in this way can be used in hand tool devices with turning driver strips of different widths on their tool holder. However, the rotation is carried out on one side, almost exclusively on the rotational driving flank of the opposite groove in the drive direction, since the locking bodies of the tool holder absorb only a small amount of torque in the locking recesses assigned to them on the tool shank.
Vorteile der ErfindungAdvantages of the invention
Zur Erzielung einer gleichmäßigeren Drehmomentbelastung des Werkzeugschafes und des Werkzeughalters wird die erfindungsgemäße Einrichtung mit den kennzeichnenden Merkmalen des Patentanspruchs 1 ausgebildet, wobei außer den mindestens zwei einander zumindest etwa gegenüberliegenden Drehmitnahmen eine weitere Drehmitnahme mit einem sehnenförmigen Auslauf auf mindestens einer Längsseite des Werkzeugschaftes bzw. des Werkzeughalters in demjenigen Umfangsbereich angeordnet ist, der der Axialverriegelung zumindest in etwa gegenüberliegt. Durch diese Lösung läßt sich in vorteilhafter Weise die Verschleißreserve für den Werkzeughalter erhöhen und die Kerbwirkung am Werkzeugschaft durch die flächige Drehmitnahme in diesem Bereich verringern bzw. ganz vermeiden. Ein weiterer5 Vorteil besteht darin, daß beim Klemmen derartiger Werkzeuge z.B. im Bohrloch, diese auch mit Maximalbelastung im Rückwärtsgang bei schlagformig ansprechender Überlastkupplung zu betreiben ist.In order to achieve a more uniform torque load on the tool sheep and the tool holder, the device according to the invention is designed with the characterizing features of patent claim 1, wherein in addition to the at least two mutually at least approximately opposite rotary drivers, a further rotary driver with a chord-shaped outlet on at least one longitudinal side of the tool shaft or the tool holder is arranged in the circumferential area which is at least approximately opposite the axial locking. This solution advantageously allows the wear reserve for the tool holder to be increased and the notch effect on the tool shank to be reduced or avoided altogether in this area due to the flat rotational driving. Another5 advantage is that when clamping such tools, for example in the borehole, they are also loaded with a maximum load Reverse gear must be operated with an abruptly responding overload clutch.
Durch die in den Unteransprüchen aufgeführten Maßnahmen ergeben sich vorteilhafte Weiterbildungen und Verbesserungen der in den Hauptansprüchen angegebenen Merkmale.The measures listed in the subclaims result in advantageous developments and improvements in the features specified in the main claims.
Zeichnungdrawing
Mehrere Ausfuhrungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen Werkzeughalter eines Bohrhammers mit eingesetztem Werkzeug im Querschnitt in vergrößerter Darstellung, Figur 2 zeigt einen Längsschnitt durch das vordere Ende des Werkzeughalters nach II-II aus Figur 1 und Figur 3 zeigt den Werkzeugschaft. Drei weitere Ausführungsbeispiele eines erfindungsgemäß ausgebildeten Werkzeugschaftes im Querschnitt und dem entsprechend ausgebildeten Werkzeughalter zeigen die Figuren 4 und 5, 6 und 7 sowie 8 und 9 .Several exemplary embodiments of the invention are shown in the drawing and explained in more detail in the following description. 1 shows a tool holder of a rotary hammer with inserted tool in cross section in an enlarged view, FIG. 2 shows a longitudinal section through the front end of the tool holder according to II-II from FIG. 1 and FIG. 3 shows the tool shank. FIGS. 4 and 5, 6 and 7 and 8 and 9 show three further exemplary embodiments of a tool shank designed according to the invention in cross section and the correspondingly designed tool holder.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Die erfindungsgemäße Einrichtung an Werkzeugmaschinen zur Drehmitnahme von schlagenden und/oder bohrenden Werkzeugen, insbesondere an Schlagbohrmaschinen und Bohrhämmern bzw. Schlaggeräten besteht im wesentlichen aus einem in Pfeilrichtung antreibbaren Werkzeughalter 10 und einen darin eingesetzten Werkzeugschaft 11 eines zum Bohren und/oder Schlagen verwendeten Werkzeuges 12. Einen Querschnitt durch eine solche Einrichtung zeigt Figur 1 als erstes Ausführungsbespiel in Verbindung mit Figur 2 und 3. Der in Figur 2 mit seinem vorderen Ende im Längsschnitt dargestellte Werkzeughalter bildet in nicht dargestellter, gemäß der WO 88/09245 bekannter Weise das Ende einer hohlzylindrischen, angetriebenen Werkzeugspindel eines Bohrhammers, in welche axial beweglich ein Döpper aufgenommen ist, der von einem Schlagwerk des Bohrhammers zyklisch auf die Stirnseite des Werkzeugschaftes 1 geschlagen wird, welcher in die Aufnahmebohrung 13 des Werkzeughalters 10 eingesetzt wird. Der Werkzeughalter 10 weist dabei einen radialen Durchbruch 14 auf, in welchem ein Verriegelungskörper 15 eingesetzt ist. Der verlaufende VerriegelungsVerriegelungskörper 15 ist in nicht dargestellter Weise beim Einschieben des Werkzeugschaftes 11 in die Aufnahmebohrung 13 radial nach außen verschiebbar und rastet zur Axialverriegelung des Werkzeuges 10 mittels einer Arretierhülse federelastisch in eine entsprechend im Werkzeugschaft 11 eingearbeitete, axial verlaufende Verrriegelungsmulde 16 ein. Der zylindrisch ausgebildete Verriegelungskörper 15 ist an seinen axialen Enden kugelförmig gerundet. Die Verriegelungsmulde 16 ist als Hohlkehle ausgebildet und endet bereits vor dem hinteren Ende des Werkzeugschaftes 11 mit einer entsprechenden sphärischen Wölbung. Zu beiden Seiten dieser aus dem Verriegelungskorper 15 und der Verriegelungsmulde 16 gebildeten Axialverriegelung sind in den gegenüberliegenden Bereichen zwei Drehmitnahmen angeordnet, wobei die eine Drehmitnahme aus einer schmalen trapezförmigen, axial zum Schaftende auslaufenden Drehmitnahmenut 17 im Werkzeugschaft 11 und einer damit zusammenwirkenden, axial verlaufenden Drehmitnahmeleiste 18 in der Aufnahmebohrung 13 des Werkzeughalters besteht. Die zweite Drehmitnahme im gegenüberliegenden Bereich wird aus einer breiteren Drehmitnahmenut 19 im Werkzeugschaft 11 und einer entsprechend breiteren, darin eingreifenden Drehmitnahmeleiste 20 des Werkzeughalters 10 gebildet. Eine dritte Drehmitnahme befindet sich in dem der Axialverriegelung gegenüberliegenden Bereich. Diese Drehmitnahme ist derart ausgebildet, daß dort der Werkzeugschaft 11 eine axial bis zum Schaftende auslaufende sehnenförmige Ausnehmung 21 (Abflachung oder Abschnitt) aufweist und der Werkzeughalter 10 im entsprechenden Umfangεbereich der Aufnahmebohrung 13 einen axial verlaufenden sehnenförmigen Vorsprung 22 hat. Diese Drehmitnahme hat nicht wie die zwei anderen Drehmitnahmen eine radiale Flanke zur Drehmomentübertragung sondern eine wesentlich größere Fläche durch den sehnenförmigen Auslauf zum Umfang des Werkzeugschaftes 11 bzw. zur Aufnahmebohrung 13 des Werkzeughalters 10. Dadurch wird in diesem Bereich die Flächenpressung und als Folge davon der Verschleiß verrringert, was sich insbesondere auch auf die radialen Drehmitnahmeflanken der beiden anderen Drehmitnahmen positiv auswirkt. Dies gilt in gleicher Weise auch für die rückwärtigen Flanken der Drehmitnahmen, welche insbesondere bei Meißelarbeiten stoßförmig beansprucht werden können, wobei dann Kerbwirkungen an den rechteck- bzw.trapezförmigen Drehmitnahmen Beschädigungen am Werkzeugschaft und/oder am Werkzeughalter hervorrufen können. Durch den sehnenförmigen Auslauf der dritten Drehmitnahme wird hier ebenfalls eine flächige Anlage zwischen Werkzeugschaft 11 und Werkzeughalter 10 geschaffen, bei welcher keinerlei Kerbwirkung auftritt. Diese Drehmitnahme entlastet in gleicher Weise auch die zwei anderen Drehmitnahmen bezüglich der Kerbbeanspruchung, insbesondere bei Meißelarbeiten.The device according to the invention on machine tools for the rotary driving of striking and / or drilling tools, in particular on impact drills and hammer drills or impact devices, essentially consists of a tool holder 10 which can be driven in the direction of the arrow and a tool shaft 11 inserted therein of a tool 12 used for drilling and / or striking. 1 shows a cross section through such a device as a first exemplary embodiment in connection with FIGS. 2 and 3. The tool holder shown in FIG. 2 with its front end in longitudinal section does not form in FIG shown, according to WO 88/09245 known manner, the end of a hollow cylindrical, driven tool spindle of a rotary hammer, in which a striker is axially movably received, which is cyclically struck by a hammer mechanism of the rotary hammer on the end face of the tool shaft 1, which in the receiving bore 13th of the tool holder 10 is used. The tool holder 10 has a radial opening 14 in which a locking body 15 is inserted. The extending locking locking body 15 can be displaced radially outward in a manner not shown when the tool shaft 11 is inserted into the receiving bore 13 and, for the axial locking of the tool 10, snaps resiliently into an axially extending locking trough 16 incorporated in the tool shaft 11 by means of a locking sleeve. The cylindrical locking body 15 is rounded at its axial ends. The locking trough 16 is designed as a groove and already ends in front of the rear end of the tool shank 11 with a corresponding spherical curvature. On both sides of this axial lock formed by the locking body 15 and the locking trough 16, two rotary drivers are arranged in the opposite areas, one rotary driver consisting of a narrow trapezoidal rotary driver groove 17 running axially to the shaft end in the tool shaft 11 and a co-operating, axially extending rotary driver bar 18 in the receiving bore 13 of the tool holder. The second rotary driver in the opposite region is formed from a wider rotary driver groove 19 in the tool shank 11 and a correspondingly wider rotary driver bar 20 of the tool holder 10 which engages therein. A third rotary drive is located in the area opposite the axial lock. This rotary drive is designed such that there the tool shank 11 has a chord-shaped recess 21 (flattening or section) which runs axially to the shank end and the tool holder 10 has an axially extending chord-shaped projection 22 in the corresponding circumferential region of the receiving bore 13. This rotary driver does not have a radial flank for torque transmission like the other two rotary drivers, but a much larger area through the chord-shaped outlet to the circumference of the tool shank 11 and to the receiving bore 13 of the tool holder 10. This results in the surface pressure in this area and, as a result, the wear reduces, which has a positive effect in particular on the radial rotary driving flanks of the other two rotary drivers. This also applies in the same way to the rear flanks of the rotary drivers, which can be subjected to shock loads in particular when chiseling work, in which case notch effects on the rectangular or trapezoidal rotary drivers can cause damage to the tool shank and / or the tool holder. The tendon-shaped outlet of the third rotary driver also creates a flat contact between tool shank 11 and tool holder 10, in which no notching effect occurs. This turning drive also relieves the other two driving loads with regard to the notch stress, in particular when chiseling.
In dem zweiten Ausführungsbeispiel eines Werkzeugschaftes 11 eines Werkzeughalters 10 nach Figur 4 und eines Werkzeughalters 10 nach Figur 5 werden aus den Figuren 1 bis 3 für gleiche Teile gleiche Bezugszahlen verwendet. Im Unterschied zum ersten Ausführungsbeispiel ist dort die der Axialverriegelung gegenüberliegende dritte Drehmitnahme, bestehend aus der Ausnehmung 21 am Werkzeugschaft 11 und dem Vorsprung 22 -am Werkzeughalter 10 in Antriebsrichtung gemäß Pfeil mit einer radial verlaufenden Flanke 21a, 22a versehen, die ausschließlich zur Drehmomentübertragung in Antriebsrichtung dient. Die rückwärtige Flanke dieser Drehmitnahme verläuft dagegen wie im ersten Ausführungsbeispiel sehnenförmig zum Umfang des Werkzeugschaftes 11 bzw. zur Aufnahmebohrung 13 des Werkzeughalters 10, um gefährliche linksdrehende Drehimpulsschläge, insbesondere bei Meißelarbeiten mit feststehendem Werkzeughalter aufzunehmen.In the second exemplary embodiment of a tool shank 11 of a tool holder 10 according to FIG. 4 and of a tool holder 10 according to FIG. 5, the same reference numbers are used from FIGS. 1 to 3 for identical parts. In contrast to the first exemplary embodiment, there is the third rotary driver opposite the axial locking, consisting of the recess 21 on the tool shank 11 and the projection 22 -am Tool holder 10 is provided in the drive direction according to the arrow with a radially extending flank 21a, 22a which is used exclusively for torque transmission in the drive direction. The rear flank of this rotary drive, on the other hand, runs like a chord to the circumference of the tool shank 11 or to the receiving bore 13 of the tool holder 10 in order to absorb dangerous left-hand rotary impulses, in particular when chiseling work with a fixed tool holder.
Im dritten Ausführungsbeispiel eines Werkzeugschaftes 11 nach Figur 6 und eines Werkzeughalters 10 nach Figur 7 sind auch die beiden einander gegenüberliegenden Drehmitnahmen, welche aus den Drehmitnahmenuten 17 und 19 und den Drehmitnahmeleisten 187 und 20 betehen, an ihren den Drehmitnahmeflächen abgewandten Bereichen sehnenförmig zum Umfang des Werkzeugschaftes 11 bzw. zur Aufnahmebohrung 13 auslaufend ausgebildet. Die Drehmitnahmeflanke 21a, 22a der dritten Drehmitnahme 21, 22 liegt hier senkrecht unter der Axialverriegelung 15, 16.In the third exemplary embodiment of a tool shank 11 according to FIG. 6 and a tool holder 10 according to FIG. 7, the two mutually opposite rotary drivers, which operate from the rotary driver grooves 17 and 19 and the rotary driver bars 187 and 20, are tendon-shaped on their areas facing away from the rotary driver surfaces to the circumference of the tool shaft 11 or to the receiving bore 13 tapered. The rotational driving flank 21a, 22a of the third rotational driving 21, 22 is here perpendicularly below the axial lock 15, 16.
Im vierten Ausführungsbeispiel nach Figur 8 und 9 ist alternativ zu den vorherigen Ausführungsbeispielen eine breitere Axialverriegelung mit dem Verriegelungskörper 15a und der damit zusammenwirkenden Verriegelungsmulde 16a im Werkzeugschaft 11 dargestellt, wobei diese Axialverriegelung in Richtung auf die schmalere Drehmitnahme am Umfang versetzt angeordnet ist. Außerdem ist dort die der Axialverriegelung gegenüberliegende dritte Drehmitnahme so ausgebildet, daß ihre drehmomentübertragende Flanke 21a mit dem sehnenförmig zum Umfang des Werkzeugschaftes 11 auslaufenden Abschnitt 21b einen Winkel von mindestens 90° bildet. Diese dritte Drehmitnahme ist ebenfalls in Richtung auf die schmalere Drehmitnahme 17, 18 in Umfangsrichtung versetzt angeordnet, um eine möglichst gleichmäßige Beanspruchung des Werkzeugschaftes 11 zu bekommen. Gegenüber dem ersten Ausführungsbeispiel sind hier die zwei einander gegenüberliegenden, verschieden breiten Drehmitnahmen vertauscht angeordnet.In the fourth exemplary embodiment according to FIGS. 8 and 9, as an alternative to the previous exemplary embodiments, a wider axial locking with the locking body 15a and the cooperating locking trough 16a in the tool shank 11 is shown, this axial locking being offset on the circumference in the direction of the narrower rotary drive. In addition, the third rotary driver opposite the axial lock is designed there in such a way that its torque-transmitting flank 21a forms an angle of at least 90 ° with the section 21b tapering to the circumference of the tool shank 11. This third rotary driver is also offset in the direction of the narrower rotary driver 17, 18 in the circumferential direction, in order to make one possible to get uniform stress on the tool shank 11. Compared to the first embodiment, the two opposite, different width rotary drivers are arranged interchanged.
Die Erfindung ist nicht auf die dargestelltenThe invention is not shown on the
Ausführungsbeispiele beschränkt, da insbesondere die Anzahl und die Form einzelner, der AxialVerrie elung nicht gegenüberliegenden Drehmitnahmen frei gewählt werden kann. Außerdem kann die sehnenförmige Drehmitnahme in dem der Axialverriegelung gegenüberliegenden Bereich auch zur Verbesserung der Kompatibilität zwischen Werkzeugschaft und Werkzeughalter mit verwendet werden, indem beispielsweise der Werkzeugschaic 11 im Ausführungsbeispiel nach Figur 1 in einen Werkzeughalter mit einer in Figur 1 gestrichelt angedeuteten drit an Drehmitnahmeleiste 22c anstelle des Vorsprungs 22 oder in einen Werkzeughalter 10 nach Figur 5 eingesetzt wird. Exemplary embodiments are limited, since in particular the number and the shape of individual rotary drivers that are not opposite the axial locking can be freely selected. In addition, the chord-shaped rotary driver in the area opposite the axial locking can also be used to improve the compatibility between the tool shank and the tool holder, for example by the tool shaver 11 in the exemplary embodiment according to FIG. 1 being inserted into a tool holder with a third on the rotary driver bar 22c indicated in dashed lines in FIG Projection 22 or in a tool holder 10 according to Figure 5 is used.

Claims

Ansprüche Expectations
1. Einrichtung an Handwerkzeug aschinen zur Drehmitnahme von schlagenden und/oder bohrenden Werkzeugen, mit mindestens drei Drehmitnahmen und mindestens einer Axialverriegelung, welche über den Umfang des Werkzeugschaftes (11) und der Aufnahmebohrung (13) des Werkzeughalters (10) mindestens etwa gleichmäßig verteilt angeordnet sind, wobei die Drehmitnahmen am Werkzeugschaft (11) als axial zum Schaftende auslaufende Ausnehmungen (17, 19, 21) sowie damit zusammenwirkende, axial verlaufende Vorsprünge (18, 20, 22) am Umfang der Aufnahmebohrung (13) ausgebildet sind und wobei die Axialverriegelung als axial verlaufende mindestens zum Schaftende hin geschlossene Mulde (16) im Werkzeugschaft (11) ausgebildet ist, die mit einem radial verschiebbaren, aus der Aufnahmebohrung (13) nach innen vorstehenden Verriegelungskörper (15) zusammenwirkt, dadurch gekennzeichnet, daß mindestens die in dem der Axialverriegelung gegenüberliegenden Umfangsbereich angeordnete Drehmitnahme derart ausgebildet ist, daß deren Vorsprung (22) und/oder Ausnehmung (21) auf mindestens einer Längsseite (21b, 22b) sehnenförmig zum Umfang des Werkzeugschaftes (11) und/oder der Aufnahmebohrung (13) des Werkzeughalters (10) ausläuft. 1. Device on hand-held machine tools for the rotary driving of striking and / or drilling tools, with at least three rotary driving and at least one axial locking device, which is arranged at least approximately uniformly distributed over the circumference of the tool shaft (11) and the receiving bore (13) of the tool holder (10) The rotary drivers on the tool shank (11) are designed as recesses (17, 19, 21) tapering axially to the shank end and cooperating, axially extending projections (18, 20, 22) on the circumference of the receiving bore (13) and the axial locking is designed as an axially extending trough (16) in the tool shank (11) which is closed at least towards the shank end and which interacts with a radially displaceable locking body (15) projecting inward from the receiving bore (13), characterized in that at least the one in which the Axial locking opposite circumferential area arranged rotary drive in such a way Det is that the projection (22) and / or recess (21) on at least one longitudinal side (21b, 22b) runs in a chord shape to the circumference of the tool shank (11) and / or the receiving bore (13) of the tool holder (10).
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die mindestens eine Drehmitnahme (21, 22) zumindest auf ihrer in Drehrichtung nacheilenden Längsseite (21b, 22b) sehnenförmig zum Umfang aus1auft.2. Device according to claim 1, characterized in that the at least one rotary driver (21, 22) at least on its longitudinal side (21b, 22b) lagging in the direction of rotation tapers to the circumference in a chord-like manner.
3. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die mindestens eine Drehmitnahme (21, 22) auf ihrer in Drehrichtung vorderen Längsseite (21a, 22a) als etwa radial verlaufende Drehmitnahmeflanke ausgebildet ist.3. Device according to claim 2, characterized in that the at least one rotary driver (21, 22) on its front longitudinal side in the direction of rotation (21a, 22a) is designed as an approximately radially extending rotary driver flank.
4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der sehnenförmige Flächenabschnitt (21b, 22b) der mindestens einen Drehmitnahme (21, 22) zur Drehmitnahmeflanke (21a, 22a) einen Winkel von mindestens 90° bildet.4. Device according to claim 3, characterized in that the chord-shaped surface section (21b, 22b) of the at least one rotary driver (21, 22) to the rotary driver flank (21a, 22a) forms an angle of at least 90 °.
5. Werkzeug für eine Einrichtung nach dem Oberbegriff des Anspruchs 1 mit mindestens drei Mitnahmeausnehmungen (17, 19, 21) und einer Verriegelungsmulde (16) , dadurch gekennzeichnet, daß mindestens die in dem der Verriegelungsmulde (16) gegenüberliegenden Umfangsbereich angeordnete Ausnehmung (21) auf mindestens einer Längsseite (21b) sehnenförmig zum Umfang des Werkzeugschaftes (11) ausläuft.5. Tool for a device according to the preamble of claim 1 with at least three driving recesses (17, 19, 21) and a locking trough (16), characterized in that at least the recess (21) arranged in the circumferential region opposite the locking trough (16) on at least one long side (21b) runs out in a sinew shape to the circumference of the tool shank (11).
6. Werkzeug nach Anspruch 5, dadurch gekennzeichnet, daß diese Ausnehmung (21) mindestens auf ihrer in Drehrichtung nacheilenden Längsseite (21b) sehnenförmig zum Schaftumfang ausläuft. 6. Tool according to claim 5, characterized in that this recess (21) at least on its longitudinal side lagging in the direction of rotation (21b) tapers to the shaft circumference.
7. Werkzeug nach Anspruch 6, dadurch gekennzeichnet, daß diese Ausnehmung (21) auf ihrer in Drehrichtung vorderen Längsseite7. Tool according to claim 6, characterized in that this recess (21) on its front longitudinal side in the direction of rotation
(21a) als etwa radial verlaufende Drehmitnahmeflanke ausgebildet ist, die mit dem sehenenförmigen Flächenabschnitt (21b) einen Winkel von mindestens 90° bildet.(21a) is designed as an approximately radially extending rotational driving flank which forms an angle of at least 90 ° with the see-shaped surface section (21b).
8. Werkzeughalter für eine Einrichtung nach dem Oberbegriff des Anspruchs 1 mit mindestens drei Mitnahmevorsprüngen (18, 20, 22) und einem Verriegelungskörper (15) am Umfang seiner Aufnahmebohrung (13) , dadurch gekennzeichnet, daß mindestens der in dem den Verriegelungskorper (15) gegenüberliegenden Umfangsbereich der Aufnahmebohrung (13) angeordnete axial verlaufende Vorsprung (22) auf mindestens einer Längsseite (22b) sehnenförmig zum Umfang der Aufnahmebohrung (13) ausläuft.8. Tool holder for a device according to the preamble of claim 1 with at least three entrainment projections (18, 20, 22) and a locking body (15) on the circumference of its receiving bore (13), characterized in that at least the one in which the locking body (15) opposite circumferential region of the receiving bore (13) arranged axially extending projection (22) on at least one longitudinal side (22b) runs out in a chord-like manner to the periphery of the receiving bore (13).
9. Werkzeughalter nach Anspruch 8, dadurch gekennzeichnet, daß dieser Vorsprung (22) mindestens auf seiner in Drehrichtung nacheilenden Längsseite (22b) sehnenförmig zum Umfang ausläuft.9. Tool holder according to claim 8, characterized in that this projection (22) at least on its trailing in the direction of rotation longitudinal side (22b) tapers to the circumference.
10. Werkzeughalter nach Anspruch 9, dadurch gekennzeichnet, daß dieser Vorsprung (22) auf seiner in Drehrichtung vorderen Längsseite (22a) als etwa radial verlaufende Drehmitnahmeflanke ausgebildet ist, die mit dem sehnenförmigen Flächenabschnitt10. Tool holder according to claim 9, characterized in that this projection (22) on its front longitudinal side (22a) in the direction of rotation is designed as an approximately radially extending rotary driving flank with the tendon-shaped surface section
(22b) einen Winkel von mindestens 90° bildet. (22b) forms an angle of at least 90 °.
EP95903257A 1994-01-14 1994-12-24 Device on hand machine tools for rotary tool drive Expired - Lifetime EP0739266B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4400969A DE4400969A1 (en) 1994-01-14 1994-01-14 Device on hand-held machine tools for turning tools
DE4400969 1994-01-14
PCT/DE1994/001534 WO1995019243A1 (en) 1994-01-14 1994-12-24 Device on hand machine tools for rotary tool drive

Publications (2)

Publication Number Publication Date
EP0739266A1 true EP0739266A1 (en) 1996-10-30
EP0739266B1 EP0739266B1 (en) 1999-10-06

Family

ID=6507946

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Application Number Title Priority Date Filing Date
EP95903257A Expired - Lifetime EP0739266B1 (en) 1994-01-14 1994-12-24 Device on hand machine tools for rotary tool drive

Country Status (19)

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US (1) US5868209A (en)
EP (1) EP0739266B1 (en)
JP (1) JPH09507437A (en)
KR (1) KR100402191B1 (en)
CN (1) CN1069569C (en)
AT (1) ATE185307T1 (en)
AU (1) AU677490B2 (en)
BR (1) BR9408484A (en)
CA (1) CA2181181C (en)
CZ (1) CZ287627B6 (en)
DE (2) DE4400969A1 (en)
DK (1) DK0739266T3 (en)
ES (1) ES2138184T3 (en)
FI (1) FI107318B (en)
RU (1) RU2141395C1 (en)
SK (1) SK283414B6 (en)
TW (1) TW252067B (en)
WO (1) WO1995019243A1 (en)
ZA (1) ZA95274B (en)

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Publication number Publication date
DE59408808D1 (en) 1999-11-11
ATE185307T1 (en) 1999-10-15
CZ200796A3 (en) 1997-02-12
SK283414B6 (en) 2003-07-01
FI107318B (en) 2001-07-13
CZ287627B6 (en) 2001-01-17
JPH09507437A (en) 1997-07-29
US5868209A (en) 1999-02-09
CN1141607A (en) 1997-01-29
ZA95274B (en) 1995-09-21
CN1069569C (en) 2001-08-15
CA2181181A1 (en) 1995-07-20
WO1995019243A1 (en) 1995-07-20
RU2141395C1 (en) 1999-11-20
CA2181181C (en) 2000-10-03
DK0739266T3 (en) 2000-04-03
SK89896A3 (en) 1997-09-10
ES2138184T3 (en) 2000-01-01
FI962842A0 (en) 1996-07-12
BR9408484A (en) 1997-08-26
AU1218795A (en) 1995-08-01
DE4400969A1 (en) 1995-07-20
FI962842A (en) 1996-07-12
EP0739266B1 (en) 1999-10-06
TW252067B (en) 1995-07-21
KR100402191B1 (en) 2004-03-26
AU677490B2 (en) 1997-04-24

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