EP0551795B1 - Tool for impact drilling and chiseling and chuck therefor - Google Patents
Tool for impact drilling and chiseling and chuck therefor Download PDFInfo
- Publication number
- EP0551795B1 EP0551795B1 EP92811004A EP92811004A EP0551795B1 EP 0551795 B1 EP0551795 B1 EP 0551795B1 EP 92811004 A EP92811004 A EP 92811004A EP 92811004 A EP92811004 A EP 92811004A EP 0551795 B1 EP0551795 B1 EP 0551795B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool
- rotary
- rotary drive
- largest
- smallest
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/02—Percussive tool bits
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- 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
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- 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
- B25D2217/0034—Details of shank profiles
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- 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
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- 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
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- 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
- Y10T408/94—Tool-support
- Y10T408/95—Tool-support with tool-retaining means
- Y10T408/953—Clamping jaws
Definitions
- the invention relates to a tool which has a clamping shank for insertion into a tool holder of a hand-held power tool intended for chiselling and / or drilling and / or impact drilling, which is provided with at least three rotary driving grooves of different cross-section, which are used for the axial insertion of rotating drivers of the tool holder in the free end surface of the clamping shaft open, and with a locking groove which is closed for receiving a locking body of the tool holder at least at its end adjacent to the end surface of the clamping shaft to limit the axial movement of the tool.
- Tools of this type are known, for example, from DE-PA 3941646 and the unpublished DE-PA 4141846.
- the rotary driving grooves or surfaces are arranged in accordance with the size of their radially outward opening surfaces in the order from the largest to the smallest opening surface and the locking groove the rotary driving grooves with the largest and smallest Opening area is adjacent. It is advantageous here if the rotary driving grooves or surfaces are arranged in the direction of rotation, according to the size of their radially outward opening surfaces, in the order from the largest to the smallest opening surface. This is advantageous because the flanks of the rotary driving grooves leading in the direction of rotation are also the flanks loaded by the drilling torque.
- a perpendicular bisector erected on the secant of the locking groove forms an angle greater than 90 ° with the perpendicular bisector erected on the secant of the largest driving surface leading it in the direction of rotation of the tool.
- the locking groove and rotary driving grooves are arranged on the clamping shaft in such a way that the edge surfaces remaining between them are of the same size, a further reduction in the stress peaks and thus the risk of breakage is achieved.
- This is also served by the convex design of the bottom surfaces of the rotary driving grooves, since this increases the cross-sectional area of the clamping shaft without reducing the contact area between the rotating driver flanks and the rotary driving groove flanks, which is decisive for the transmission of the torque.
- the rotary driving grooves of the largest and smallest opening area are diametrically opposite one another and a third rotary driving groove is preferably arranged at an angle of 90 ° to them.
- the in the FIG. 1 and 2 shown clamping shaft 11 has a locking groove 12 and three rotary driving grooves 13, 14, 15.
- the direction of rotation during drilling is shown in FIG. 2 indicated by an arrow.
- the rotary driving grooves 13, 14, 15 are arranged in the direction of rotation according to the size of their radial opening area from the locking groove 12 so that this opening area becomes smaller.
- the locking groove 12 is located between the largest rotary driving groove 13 and the smallest rotating driving groove 15.
- the edge surfaces 17, 18, 19, 20 of the clamping shaft 11 between the grooves 12, 13, 14, 15 are approximately the same size. As shown in FIG.
- the rotary driving grooves 13, 14, 15 open into the free end surface 16 of the clamping shaft, so that the tool shaft can be inserted axially into a tool holder which has strip-shaped rotary drivers adapted to the grooves 13, 14, 15. It is obvious that despite the very differently sized rotary driving grooves, which are due to the fact that the tool should only be inserted into the tool holder in one position, the arrangement of the rotating driving grooves and the locking groove described above result in a favorable distribution of the loads which occur due to the uniform distribution the cross-sectional area is achieved.
- the in the FIG. 3 and 4 shown clamping shaft has the three rotational driving grooves 23, 24, 25 arranged at right angles to each other.
- the locking groove 22 is arranged to the largest rotary driving groove 23 at an angle ⁇ greater than 90 °. With the smallest rotary driving groove 25, the locking groove 22 forms an angle ⁇ of less than 90 °. This results in a better division of the cross-sectional area.
- the two locking bodies 27 and 28 of the best-selling heavy rotary hammer are indicated by dashed lines and shown that the tool according to the invention can also be used in this rotary hammer machine in that the cross-sectional shape 30 of the locking groove 22 and the cross-sectional shape 31 of the rotary driving groove 24 are designed accordingly. Due to the right-angled arrangement of the rotary driving grooves, the one shown in FIG. 4 clamping shank shown is particularly good for mechanical production. The bottom surface 29 of the locking groove 23 is convexly curved and thereby increases the cross-sectional area.
- FIG. 5 and 6 illustrated embodiment differs from the embodiment in FIG. 3 and 4 in that the rotary driving groove 35 has a larger radial opening area and is asymmetrical.
- the rectangular coordinate axes in FIG. 6 divide the opening areas of the rotary driving grooves into sections, the sections 37, 38, 39 which advance in the direction of rotation relative to the coordinate axes becoming smaller as seen from the locking groove.
- FIG. 7 shows the tool holder 40 of a rotary hammer in cross section. It has the rotary drivers 43, 44, 45 adapted to the rotary driving grooves 23, 24, 25 of the tool.
- the locking body 49 is guided in the recess 41 of the tool holder 40 and engages in the locking groove 22 of the tool.
- the locking body is offset by an angle ⁇ , which is greater than 90 °, with respect to the larger rotary driver 43 and an angle ⁇ , which is less than 90 °, with respect to the smallest rotary driver 45.
- the foot cross sections 46, 47, 48 of the rotary drivers 43, 44, 45 are smaller as seen from the locking body 49.
- the tools and tool holders according to the invention reduce wear and tear in a surprisingly simple manner Fatigue problems. There are no additional costs compared to the tools of the generic term. It can be produced on existing manufacturing facilities.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Gripping On Spindles (AREA)
- Drilling Tools (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Earth Drilling (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Description
Die Erfindung betrifft ein Werkzeug, das zum Einsetzen in eine Werkzeugaufnahme einer für das Meißeln und/oder Bohren und/oder Schlagbohren vorgesehenen Handwerkzeugmaschine einen Einspannschaft aufweist, der versehen ist mit mindestens drei Drehmitnahmenuten unterschiedlichen Querschnittes, die für das axiale Einführen von Drehmitnehmern der Werkzeugaufnahme in die freie Endfläche des Einspannschaftes münden, und mit einer Verriegelungsnut, die für die Aufnahme eines Verriegelungskörpers der Werkzeugaufnahme mindestens an ihren der Endfläche des Einspannschaftes benachbarten Ende zur Begrenzung der Axialbewegung des Werkzeuges geschlossen ist. Werkzeuge dieser Art sind beispielsweise durch die DE-PA 3941646 und die nicht vor veröffentlichte DE-PA 4141846 bekannt. Diese Werkzeuge sind durch die unterschiedlichen Querschnitte der Drehmitnehmer so ausgebildet, daß sie nur in einer Winkelstellung in die Werkzeugaufnahme eingeführt werden können.
Als nachteilig hat sich jedoch herausgestellt, daß bei derartigen Werkzeugen die zwischen der Verriegelungsnut und den Drehmitnahmenuten verbleibende Randfläche des Einspannschaftes sehr unterschiedlich groß ist. Durch den rauhen Baustellenbetrieb tritt aber nach längerem Gebrauch des Werkzeuges ein Ausschlagen der Nuten ein, so daß aufgrund der verbleibenden Restwandstärke zwischen den Nuten von diesen Stellen aus die beim Schlagen entstehenden Spannungsspitzen zu Dauerbrüchen führen.
Der Erfindung liegt die Aufgabe zugrunde, Werkzeuge nach der Gattung des Hauptanspruches so auszubilden, daß der Einspannschaft durch die notwendigen Drehmitnahmenuten und die Verriegelungsnut weniger geschwächt wird.The invention relates to a tool which has a clamping shank for insertion into a tool holder of a hand-held power tool intended for chiselling and / or drilling and / or impact drilling, which is provided with at least three rotary driving grooves of different cross-section, which are used for the axial insertion of rotating drivers of the tool holder in the free end surface of the clamping shaft open, and with a locking groove which is closed for receiving a locking body of the tool holder at least at its end adjacent to the end surface of the clamping shaft to limit the axial movement of the tool. Tools of this type are known, for example, from DE-PA 3941646 and the unpublished DE-PA 4141846. Due to the different cross-sections of the rotary drivers, these tools are designed such that they can only be inserted into the tool holder in an angular position.
It has been found to be disadvantageous, however, that the edge surface of the clamping shank remaining between the locking groove and the rotary driving grooves is very different in size with such tools. Due to the rough construction site operation, the grooves knock out after prolonged use of the tool, so that due to the remaining wall thickness between the grooves, the stress peaks that occur during impact lead to permanent breaks.
The invention has for its object to design tools according to the type of the main claim so that the clamping shank is weakened less by the necessary rotary driving grooves and the locking groove.
Diese Aufgabe ist gemäß der Erfindung bei einem eingangs genannten Werkzeug dadurch gelöst, daß die Drehmitnahmenuten oder -flächen entsprechend der Größe ihrer radial nach außen angeordneten Öffnungsflächen in der Reihenfolge von der größten zur kleinsten Öffnungsfläche hin angeordnet sind und die Verriegelungsnut den Drehmitnahmenuten mit größter und kleinster Öffnungsfläche benachbart ist. Vorteilhaft ist es hierbei, wenn die Drehmitnahmenuten oder -flächen in Drehrichtung gerechnet entsprechend der Größe ihrer radial nach außen angeordneten Öffnungsflächen in der Reihenfolge von der größten zur kleinsten Öffnungsfläche hin angeordnet sind. Dies ist deswegen von Vorteil, da die in Drehrichtung voreilenden Flanken der Drehmitnahmenuten auch die durch das Bohrmoment belasteten Flanken sind. In einer weiteren vorteilhaften Ausbildung bildet eine auf der Sekante der Verriegelungsnut errichtete Mittelsenkrechte mit der auf der Sekante der ihr in Drehrichtung des Werkzeuges voreilenden Drehmitnahmenut größter Öffnungsfläche errichteten Mittelsenkrechten einen Winkel größer 90°. Durch diese verschiedenen Ausbildungen wird die zwischen den Nuten verbleibende äußere Fläche des Einspannschaftes gleichmäßiger als bisher unterteilt und die Spannungsspitzen beim Schlagbohren und Meißeln reduziert.This object is achieved according to the invention in a tool mentioned at the outset in that the rotary driving grooves or surfaces are arranged in accordance with the size of their radially outward opening surfaces in the order from the largest to the smallest opening surface and the locking groove the rotary driving grooves with the largest and smallest Opening area is adjacent. It is advantageous here if the rotary driving grooves or surfaces are arranged in the direction of rotation, according to the size of their radially outward opening surfaces, in the order from the largest to the smallest opening surface. This is advantageous because the flanks of the rotary driving grooves leading in the direction of rotation are also the flanks loaded by the drilling torque. In a further advantageous embodiment, a perpendicular bisector erected on the secant of the locking groove forms an angle greater than 90 ° with the perpendicular bisector erected on the secant of the largest driving surface leading it in the direction of rotation of the tool. As a result of these different designs, the outer surface of the clamping shank remaining between the grooves is divided more evenly than previously and the stress peaks during impact drilling and chiseling are reduced.
Werden Verriegelungsnut und Drehmitnahmenuten so auf dem Einspannschaft angeordnet, daß die zwischen ihnen jeweils verbleibenden Randflächen gleich groß sind, so wird eine weitere Reduktion der Spannungsspitzen und damit der Bruchgefahr erreicht. Dem dient auch die konvexe Ausbildung der Bodenflächen der Drehmitnahmenuten, da dadurch die Querschnittsfläche des Einspannschaftes vergrößert wird, ohne daß dabei die Kontaktfläche zwischen Drehmitnehmerflanken und Drehmitnahmenutenflanken, die für die Übertragung des Drehmoments entscheidend ist, verkleinert wird.
Für eine kostengünstige Fertigung der Werkzeuge auf vorhandenen Produktionsautomaten ist es vorteilhaft, wenn die Drehmitnahmenuten größter und kleinster Öffnungsfläche einander diametral gegenüberliegen und vorzugsweise eine dritte Drehmitnahmenut zu diesen unter einem Winkel von 90° angeordnet ist.If the locking groove and rotary driving grooves are arranged on the clamping shaft in such a way that the edge surfaces remaining between them are of the same size, a further reduction in the stress peaks and thus the risk of breakage is achieved. This is also served by the convex design of the bottom surfaces of the rotary driving grooves, since this increases the cross-sectional area of the clamping shaft without reducing the contact area between the rotating driver flanks and the rotary driving groove flanks, which is decisive for the transmission of the torque.
For cost-effective production of the tools on existing production machines, it is advantageous if the rotary driving grooves of the largest and smallest opening area are diametrically opposite one another and a third rotary driving groove is preferably arranged at an angle of 90 ° to them.
Es kann durch technische Gründe, die ihre Ursache in der Werkzeugaufnahme haben, notwendig werden, den Fußquerschitt des kleineren Drehmitnehmers, der der Verriegelungsnut benachbart ist, aus Verschleißgründen zu verstärken. Dies kann dazu führen, daß die radiale Öffnungsfläche der kleineren an die Verriegelungsnut angrenzenden Drehmitnahmenut dadurch größer wird als die radiale Öffnungsfläche der dieser Drehmitnahmenut benachbarten Drehmitnahmenut. Hier liegt dann keine Verletzung der erfindungsgemäßen Lehre vor, wenn von dem Mittelpunkt des Einspannschaftquerschnitts ausgehende, rechtwinklige Koordinatenachsen die radialen Öffnungsflächen von drei Drehmitnahmenuten bzw. -flächen in Öffnungsflächenabschnitte unterteilen und, von der Verriegelungsnut gesehen, die radialen Öffnungsflächenabschnitte, welche in Drehrichtung vor der jeweiligen teilenden Koordinatenachse liegen, kleiner werden. Das heißt, es ist bei dem Erfindungsgedanken vor allem auf die durch das Bohrmoment belasteten Flanken bzw. Flächen der Drehmitnahmenuten abzustellen und auf deren optimale Anordnung.For technical reasons, which are due to the tool holder, it may be necessary to reinforce the foot cross section of the smaller rotary driver, which is adjacent to the locking groove, for reasons of wear. This can result in the radial opening area of the smaller rotary driving groove adjoining the locking groove becoming larger than the radial opening area of the rotating driving groove adjacent to this rotating driving groove. Here there is no violation of the teaching according to the invention if, starting from the center point of the clamping shaft cross-section, right-angled coordinate axes divide the radial opening surfaces of three rotary driving grooves or surfaces into opening surface sections and, viewed from the locking groove, the radial opening surface sections which are in the direction of rotation before the respective one dividing coordinate axis, become smaller. This means that the idea of the invention is based primarily on the flanks or surfaces of the rotary driving grooves which are loaded by the drilling torque and on their optimal arrangement.
Um zu ermöglichen, daß erfindungsgemäße Werkzeuge auch in dem bisher meistverkauften schweren Bohrhammer, der eine Werkzeugaufnahme mit zwei diametral gegenüberliegenden Verriegelungskörpern in Form zylindrischer Walzen aufweist, eingesetzt werden können, weisen bei einer weiteren vorteilhaften Ausführungsform die Verriegelungsnut und die ihr gegenüberliegende Drehmitnahmenut Querschnittsformen auf, die zur Aufnahme spiegelbildlich angeordneter, gleich großer Verriegelungskörper ausgebildet sind. Üblicherweise ist der Querschnitt einer Verriegelungsnut Teil eines Kreises. Unter Verschleiß- und Dauerbruch-Gesichtspunkten hat sich gezeigt, daß andere Querschnittsformen Vorteile haben.
Da beim Schlagbohren die Belastungsspitzen sich aus der Überlagerung von Drehmoment und Schlagbeanspruchung ergeben, werden vorteilhafterweise die Drehmitnahmenuten deutlich länger als die Verriegelungsnut ausgebildet.
Da das erfindungsgemäße Werkzeug eine entsprechend angepaßte Werkzeugaufnahme zur Verwirklichung der Vorteile benötigt, bezieht sich die Erfindung daher auch auf eine Werkzeugaufnahme für schlagende und/oder bohrende Werkzeuge mit mindestens drei Drehmitnehmern, die für das axiale Einführen in Drehmitnahmenuten von Werkzeugen vorgesehen sind, und mit einem Verriegelungskörper, der zum radialen Einführen in eine Verriegelungsnut des Werkzeuges vorgesehen ist. Der Erfindung liegt auch hier die Aufgabe zugrunde, die Werkzeugaufnahme so auszubilden, daß die von ihr auf das Werkzeug ausgehende Belastung minimiert wird, zusätzlich soll der Verschleiß in der Werkzeugaufnahme reduziert und der unvermeidliche Verschleiß gleichmäßig verteilt werden.
Diese Aufgabe ist bei der o. g. Werkzeugaufnahme gemäß der Erfindung dadurch gelöst, daß die Drehmitnehmer vorzugsweise in Drehrichtung gerechnet entsprechend der Größe ihrer Fußquerschnitte in der Reihenfolge vom größten zum kleinsten Fußquerschnitt hin angeordnet sind und der Verriegelungskörper den Drehmitnehmern größten und kleinsten Fußquerschnittes benachbart ist.
Vorteilhaft ist es, wenn dabei eine auf der Sekante der zum Werkzeug gerichteten Öffnungsfläche der Aussparung für den Verriegelungskörper errichtete Mittelsenkrechte mit der auf der Sekante des größten Drehmitnehmers errichteten Mittelsenkrechten einen Winkel größer 90° bildet. In einer weiteren vorteilhaften Ausbildung ist der auf gleiche Weise ermittelte Winkel zwischen dem Verriegelungskörper und dem benachbarten kleineren Drehmitnehmer kleiner als 90°.
Für ein günstigeres Verschleißverhalten in der Bohrung der Werkzeugaufnahme ist es vorteilhaft, wenn die Drehmitnehmer annähernd rechtwinklig zueinander angeordnet sind, da dann unter Belastung ein gleichmäßiges Tragbild erzielt wird.
Weitere Merkmale der Erfindung sind in der folgenden Beschreibung von in der Zeichnung dargestellten Ausführungsbeispielen im einzelnen erläutert.
Es zeigen:
- FIG. 1, 3, 5:
- Seitenansichten von verschiedenen Ausführungsbeispielen des abgebrochen dargestellten Einspannschaftes von drei verschiedenen Werkzeugen und
- FIG. 2, 4, 6:
- Querschnitte der Einspannschäfte nach den FIG. 1 bzw. 3, 5.
- FIG. 7:
- Einen Querschnitt durch eine an einem Bohrhammer befindliche Werkzeugaufnahme für den in dieser Werkzeugaufnahme befindlichen Einspannschaft des Werkzeuges.
Since the impact peaks during impact drilling result from the superimposition of torque and impact stress, the rotary driving grooves are advantageously made significantly longer than the locking groove.
Since the tool according to the invention requires a correspondingly adapted tool holder for realizing the advantages, the invention therefore also relates to a tool holder for percussive and / or drilling tools with at least three rotary drivers, which are provided for the axial insertion into rotary driving grooves of tools, and with a locking body, which is provided for radial insertion into a locking groove of the tool. The invention is also based on the object of designing the tool holder in such a way that the load it exerts on the tool is minimized, in addition the wear in the tool holder is to be reduced and the inevitable wear is to be distributed uniformly.
This object is achieved in the above-mentioned tool holder according to the invention in that the rotary drivers are preferably arranged in the direction of rotation according to the size of their foot cross-sections in the order from the largest to the smallest foot cross-section and the locking body is adjacent to the rotary drivers largest and smallest foot cross-section.
It is advantageous if a central perpendicular created on the secant of the opening surface of the recess facing the tool for the locking body forms an angle greater than 90 ° with the central perpendicular established on the secant of the largest rotary driver. In a further advantageous embodiment, the angle determined in the same way between the locking body and the adjacent smaller rotary driver is less than 90 °.
For more favorable wear behavior in the bore of the tool holder, it is advantageous if the rotary drivers are arranged approximately at right angles to one another, since a uniform contact pattern is then achieved under load.
Further features of the invention are explained in detail in the following description of exemplary embodiments shown in the drawing.
Show it:
- FIG. 1, 3, 5:
- Side views of different embodiments of the clamping shank of three different tools and shown broken
- FIG. 2, 4, 6:
- Cross sections of the clamping shafts according to FIG. 1 or 3, 5.
- FIG. 7:
- A cross section through a tool holder located on a hammer drill for the clamping shank of the tool located in this tool holder.
Der in den FIG. 1 und 2 dargestellte Einspannschaft 11 weist eine Verriegelungsnut 12 und drei Drehmitnahmenuten 13, 14, 15 auf. Die Drehrichtung beim Bohren ist in FIG. 2 durch einen Pfeil angedeutet. Die Drehmitnahmenuten 13, 14, 15 sind in Drehrichtung entsprechend der Größe ihrer radialen Öffnungsfläche von der Verriegelungsnut 12 aus gesehen so angeordnet, daß diese Öffnungsfläche kleiner wird. Die Verriegelungsnut 12 befindet sich zwischen der größten Drehmitnahmenut 13 und der kleinsten Drehmitnahmenut 15. Die Randflächen 17, 18, 19, 20 des Einspannschaftes 11 zwischen den Nuten 12, 13, 14, 15 sind annähernd gleich groß. Wie aus FIG. 1 ersichtlich ist, münden die Drehmitnahmenuten 13, 14, 15 in die freie Endfläche 16 des Einspannschaftes, so daß der Werkzeugschaft axial in eine Werkzeugaufnahme einführbar ist, die den Nuten 13, 14, 15 angepaßte leistenförmige Drehmitnehmer aufweist. Es ist offensichtlich, daß trotz der sehr unterschiedlich großen Drehmitnahmenuten, die dadurch bedingt sind, daß das Werkzeug nur in einer Position in die Werkzeugaufnahme eingesetzt werden soll, durch die geschilderte Anordnung der Drehmitnahmenuten und der Verriegelungsnut eine günstige Verteilung der auftretenden Belastungen durch die gleichmäßige Aufteilung der Querschnittsfläche erzielt wird.The in the FIG. 1 and 2 shown clamping shaft 11 has a
Der in den FIG. 3 und 4 dargestellte Einspannschaft weist die drei rechtwinklig zueinander angeordneten Drehmitnahmenuten 23, 24, 25 auf. Die Verriegelungsnut 22 ist zu der größten Drehmitnahmenut 23 unter einem Winkel α großer 90° angeordnet. Mit der kleinsten Drehmitnahmenut 25 bildet die Verriegelungsnut 22 einen Winkel β kleiner 90°. Hierdurch wird eine bessere Aufteilung der Querschnittsfläche erzielt.The in the FIG. 3 and 4 shown clamping shaft has the three
In FIG. 4 sind die beiden Verriegelungskörper 27 und 28 des meistverkauften schweren Bohrhammers gestrichelt angedeutet und gezeigt, daß das erfindungsgemäße Werkzeug auch in dieser Bohrhammermaschine dadurch eingesetzt werden kann, daß die Querschnittsform 30 der Verriegelungsnut 22 und die Querschnittsform 31 der Drehmitnahmenut 24 entsprechend ausgebildet sind. Aufgrund der rechtwinkligen Anordnung der Drehmitnahmenuten eignet sich der in FIG. 4 dargestellte Einspannschaft besonders gut für die mechanische Fertigung. Die Bodenfläche 29 der Verriegelungsnut 23 ist konvex gewölbt und vergrößert dadurch die Querschnittsfläche.In FIG. 4, the two
Das in FIG. 5 und 6 dargestellte Ausführungsbeispiel unterscheidet sich von dem Ausführungsbeispiel in FIG. 3 und 4 dadurch, daß die Drehmitnahmenut 35 eine größere radiale Öffnungsfläche aufweist und unsymmetrisch ausgebildet ist. Die rechtwinkligen Koordinatenachsen in FIG. 6 unterteilen die Öffnungsflächen der Drehmitnahmenuten in Abschnitte, wobei die gegenüber den Koordinatenachsen in Drehrichtung voreilenden Abschnitte 37, 38, 39 von der Verriegelungsnut aus gesehen kleiner werden.The in FIG. 5 and 6 illustrated embodiment differs from the embodiment in FIG. 3 and 4 in that the
In FIG. 7 ist die Werkzeugaufnahme 40 eines Bohrhammers im Querschnitt dargestellt. Sie weist die den Drehmitnahmenuten 23, 24, 25 des Werkzeuges angepaßten Drehmitnehmer 43, 44, 45 auf. Der Verriegelungskörper 49 ist in der Aussparung 41 der Werkzeugaufnahme 40 geführt und greift in die Verriegelungsnut 22 des Werkzeuges ein. In dem Ausführungsbeispiel ist der Verriegelungskörper um einen Winkel α , der größer als 90° ist, gegenüber dem größeren Drehmitnehmer 43 und einem Winkel β , der kleiner 90° ist, gegenüber dem kleinsten Drehmitnehmer 45 versetzt. Die Fußquerschnitte 46, 47, 48 der Drehmitnehmer 43, 44, 45 werden von dem Verriegelungskörper 49 aus gesehen kleiner.In FIG. 7 shows the
Die erfindungsgemäßen Werkzeuge und Werkzeugaufnahmen reduzieren in überraschend einfacher Weise Verschleiß- und Dauerbruchprobleme. Mehrkosten entstehen gegenüber den Werkzeugen des Gattungsbegriffes nicht. Es kann auf vorhandenen Fertigungseinrichtungen produziert werden.The tools and tool holders according to the invention reduce wear and tear in a surprisingly simple manner Fatigue problems. There are no additional costs compared to the tools of the generic term. It can be produced on existing manufacturing facilities.
Basierend auf der Erfindungsidee sind weitere, hier nicht beschriebene und gezeichnete Ausführungsformen möglich. Dies betrifft insbesondere auch die Querschnittsform der Drehmitnahmenuten, bei denen diese beispielsweise als Flächen oder als Teile von Kreisen ausgeführt werden können. Entsprechendes gilt auch für die Querschnittsform der Verriegelungsnut.Based on the idea of the invention, further embodiments not described and drawn here are possible. This also applies in particular to the cross-sectional shape of the rotary driving grooves, in which they can be designed, for example, as surfaces or as parts of circles. The same applies to the cross-sectional shape of the locking groove.
Claims (16)
- A tool, comprising a clamping shaft for insertion into a tool chuck of a chiseling and/or drilling and/or percussion drilling tool which is provided with at least three rotary drive grooves or surfaces (13, 14, 15, 23, 24, 25, 35) of different cross-sections which, for the purpose of axial insertion of rotary drives of the tool chuck, terminate in the free end surface (16) of the clamping shaft (11), and a locking groove or surface (12, 22) which is closed at least at its end adjacent the end surface (16) of the clamping shaft (11) to define the axial movement of the tool for the purpose of accommodating a locking element (49) of the tool chuck (40), characterized in that the rotary drive grooves or surfaces (13, 14, 15, 23, 24, 25, 35) are arranged in order of size from the largest to the smallest opening surface so as to correspond with the size of their radially outwardly arranged opening surfaces, and the locking groove or surface (12, 22) is adjacent the rotary drive grooves (13, 15, 23, 25) having the largest and the smallest opening surface.
- A tool according to claim 1, characterized in that the rotary drive grooves or surfaces (13, 14, 15, 23, 24, 25, 35) are arranged in the direction Of rotation according to the size of their radially outwardly arranged opening surfaces in the order from the largest to the smallest opening surface.
- Tools according to claim 1 or 2, characterized in that a mid-vertical established on the secant of the locking groove or surface (22) and the mid-vertical established on the secant of the rotary drive groove or surface with the largest opening surface (23) are at an angle α of more thin 90°.
- A tool according to one of the above claims, characterized in that the mid-verticals on the secants of the locking groove or surface (22) and on the rotary drive groove or surface of the smallest radial opening surface (25) are at an angle β of less than 90°.
- A tool according to one of the above claims, characterized in that the edge surfaces (17 - 20) of the clamping shaft are virtually identical, preferably exactly identical, in size between the grooves or surfaces (12 - 15, 22 - 25).
- A tool according to one of the above claims, characterized in that at least the rotary drive groove of the largest opening surface (13, 23), preferably all rotary drive grooves (13, 14, 15, 23, 24, 25, 35), has/have a convex curved bottom surface (29).
- A tool according to one of the above claims, characterized in that the rotary drive groove or surface of the largest opening surface (23) and the rotary drive groove or surface of the smallest opening surface (25) are virtually, preferably precisely, diametrally opposite each other, and that a third rotary drive groove or surface (24) is arranged between both of them at an angle of virtually 90°.
- A tool according to one of the above claims, characterized in that rectangular coordinate axes extending from the centre point of the clamping shaft cross-section divide the radial opening surfaces of three rotary drive grooves or surfaces into opening surface sections, so that, as seen from the locking groove or surface, the radial opening surface sections (37, 38, 39), which are positioned in front of a respective dividing coordinate axis as soon in the rotary direction, are reducing in size.
- A tool according to one of the above claims, characterized in that the locking groove or surface (22) and the rotary drive groove or surface (24) located opposite the latter are of cross-sectional shapes (30, 31) which are designed to accommodate mirror-symmetrically arranged locking elements (27, 28) of identical size.
- A tool according to one of the above claims, characterized in that the locking groove or surface (22) is of a cross-sectional shape (30) which is not part of a circle.
- A tool according to one of the above claims, characterized in that in the longitudinal axis of the tool the axial extent of all rotary drive grooves or surfaces (13, 14, 15, 23, 24, 25, 35) is greater than that of the locking groove or surface (12, 22).
- A tool chuck for percussion and/or drilling tools, comprising at least three rotary drives (43, 44, 45) which are provided for axial insertion into rotary drive grooves (23, 24, 25) of tools, and a locking element (49) which is provided for radial insertion into a locking groove (22) of the tool and which is guided in a recess (41) of the tool chuck (40), characterized in that the rotary drives (43, 44, 45) are, preferably in the rotary direction designed to correspond with the size of their base cross-sections (46, 47, 48) in the order from the largest to the smallest base cross-section (46, 47, 48), and the locking element (49) is adjacent the rotary drives (43, 45) of the largest and the smallest base cross-section (46, 48).
- Tool chuck according to claim 12, characterized in that a mid-vertical arranged on the secant of the opening surface, which is oriented towards the tool, of the recess (41) for the locking element (49) and the mid-vertical arranged on the secant of the largest rotary pickup (43) form an angle of more than 90°.
- Tool chuck according to one of claims 12 and 13, characterized in that the locking element (49) is adjacent the smallest rotary pickup (45), and that a mid-vertical arranged on the secant of the opening surface, which is oriented towards the tool, of the recess (41) for the locking element (49) and the mid-vertical arranged on the secant of the smallest rotary pickup (45) form an angle β of less than 90°.
- Tool chuck according to one of claims 12 to 14, characterized in that the rotary pickups of the largest cross-section (43) and the rotary pickups of the smallest cross-section (45) are positioned at least virtually diametrally opposite each other, and a athird rotary pickup (44) is arranged between both of them at an angle of virtually 90°.
- Tool chuck according to one of claims 12 to 15, characterized in that the portion of the locking element (49) facing towards the tool has a cross-sectional shape which is not part of a circle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4200643A DE4200643A1 (en) | 1992-01-13 | 1992-01-13 | IMPACT DRILLING TOOLS AND CHISELING TOOLS FOR THESE TOOLS |
| DE4200643 | 1992-01-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0551795A1 EP0551795A1 (en) | 1993-07-21 |
| EP0551795B1 true EP0551795B1 (en) | 1995-03-01 |
Family
ID=6449431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92811004A Expired - Lifetime EP0551795B1 (en) | 1992-01-13 | 1992-12-15 | Tool for impact drilling and chiseling and chuck therefor |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5320459A (en) |
| EP (1) | EP0551795B1 (en) |
| JP (1) | JPH05305576A (en) |
| KR (1) | KR100273081B1 (en) |
| DE (2) | DE4200643A1 (en) |
| DK (1) | DK0551795T3 (en) |
| FI (1) | FI102817B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4227949A1 (en) * | 1992-08-22 | 1994-02-24 | Bosch Gmbh Robert | Tool for hand machine tools |
| DE4313580A1 (en) * | 1993-04-26 | 1994-10-27 | Hilti Ag | Tool clamping |
| DE4338818A1 (en) * | 1993-11-13 | 1995-05-18 | Hawera Probst Kg Hartmetall | Torque transmission for manual power hammer drill, etc. |
| DE4340728C1 (en) * | 1993-11-30 | 1995-01-26 | Bosch Gmbh Robert | Device on powered hand tools for the rotary driving of tools |
| DE4341970A1 (en) * | 1993-12-09 | 1995-06-14 | Hilti Ag | Tool and tool holder for hand tools |
| DE4400969A1 (en) * | 1994-01-14 | 1995-07-20 | Bosch Gmbh Robert | Device on hand-held machine tools for turning tools |
| CZ287520B6 (en) * | 1994-01-14 | 2000-12-13 | Bosch Gmbh Robert | Mechanism of hand-held cutting device for rotary driving of impact and/or drilling tools, a tool and a tool holder |
| DE4403303A1 (en) * | 1994-02-03 | 1995-08-10 | Hilti Ag | Tool and tool holder for hand tools |
| DE19507567A1 (en) * | 1995-03-03 | 1996-09-05 | Drebo Werkzeugfab Gmbh | drill |
| DE19537561A1 (en) * | 1995-10-09 | 1997-04-10 | Hilti Ag | Tool holder |
| DE19734140A1 (en) * | 1997-08-07 | 1999-02-11 | Hawera Probst Gmbh | Hammer boring machine striking function boring tool |
| DE20204416U1 (en) * | 2002-03-19 | 2002-07-11 | Gebrüder Heller Dinklage GmbH, 49413 Dinklage | Tool for a hand machine tool |
| ATE460255T1 (en) * | 2003-11-26 | 2010-03-15 | Hilti Ag | TOOL HOLDER FOR A ROTATING AND IMPACTING TOOL |
| DE102004026850A1 (en) * | 2004-06-02 | 2005-12-29 | Hilti Ag | Plug-in ends for a rotating and / or beating tool |
| KR101795138B1 (en) | 2015-07-03 | 2017-11-08 | 경북대학교 산학협력단 | By-product feed fermentation and storage integration system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3745046C2 (en) * | 1987-05-20 | 1996-07-25 | Bosch Gmbh Robert | Torque coupling e.g. for hand held electric impact drill |
| DE3824894A1 (en) * | 1988-07-22 | 1990-01-25 | Bosch Gmbh Robert | DEVICE ON HAND MACHINE TOOLS FOR TORQUE TRANSMISSION |
| DE3941646A1 (en) * | 1989-12-16 | 1991-06-20 | Heller Werkzeug Gmbh Geb | IMPACT DRILLING TOOL AND TOOL ADAPTER FOR IMPACT DRILLING TOOLS |
| DE9013190U1 (en) * | 1990-09-17 | 1992-01-23 | Drebo Werkzeugfabrik GmbH, 7963 Altshausen | drill |
| DE4032739A1 (en) * | 1990-10-16 | 1992-04-23 | Bosch Gmbh Robert | Universal tool shank for use in portable power tools - has longitudinal slots allowing tool to locate with axial play in chuck or hammer drill tool holder |
-
1992
- 1992-01-13 DE DE4200643A patent/DE4200643A1/en not_active Withdrawn
- 1992-12-15 DK DK92811004.8T patent/DK0551795T3/en active
- 1992-12-15 DE DE59201545T patent/DE59201545D1/en not_active Expired - Fee Related
- 1992-12-15 EP EP92811004A patent/EP0551795B1/en not_active Expired - Lifetime
-
1993
- 1993-01-08 KR KR1019930000179A patent/KR100273081B1/en not_active IP Right Cessation
- 1993-01-12 US US08/003,180 patent/US5320459A/en not_active Expired - Lifetime
- 1993-01-12 JP JP5003387A patent/JPH05305576A/en active Pending
- 1993-01-12 FI FI930104A patent/FI102817B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| FI102817B1 (en) | 1999-02-26 |
| FI102817B (en) | 1999-02-26 |
| FI930104A (en) | 1993-07-14 |
| DE59201545D1 (en) | 1995-04-06 |
| JPH05305576A (en) | 1993-11-19 |
| KR100273081B1 (en) | 2000-12-01 |
| KR930016201A (en) | 1993-08-26 |
| US5320459A (en) | 1994-06-14 |
| DE4200643A1 (en) | 1993-07-15 |
| DK0551795T3 (en) | 1995-07-24 |
| FI930104A0 (en) | 1993-01-12 |
| EP0551795A1 (en) | 1993-07-21 |
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