EP1949992A1 - Motor driven hammer drill or impact drilling machine - Google Patents

Motor driven hammer drill or impact drilling machine Download PDF

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Publication number
EP1949992A1
EP1949992A1 EP07001555A EP07001555A EP1949992A1 EP 1949992 A1 EP1949992 A1 EP 1949992A1 EP 07001555 A EP07001555 A EP 07001555A EP 07001555 A EP07001555 A EP 07001555A EP 1949992 A1 EP1949992 A1 EP 1949992A1
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EP
European Patent Office
Prior art keywords
drive
sleeve
exciter
exciter sleeve
drive shaft
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
EP07001555A
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German (de)
French (fr)
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EP1949992B1 (en
Inventor
Ralf Ott
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.)
Metabowerke GmbH and Co
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Metabowerke GmbH and Co
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 Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Priority to EP07001555A priority Critical patent/EP1949992B1/en
Priority to DE502007003926T priority patent/DE502007003926D1/en
Priority to AT07001555T priority patent/ATE468935T1/en
Publication of EP1949992A1 publication Critical patent/EP1949992A1/en
Application granted granted Critical
Publication of EP1949992B1 publication Critical patent/EP1949992B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/12—Means for driving the impulse member comprising a crank mechanism
    • B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/351—Use of pins

Definitions

  • the invention relates to a power driven rotary hammer or chisel hammer, with a percussion mechanism with a translationally movable in a longitudinal direction and forth exciter sleeve and a shock from the exciter sleeve and in the exciter sleeve (8) in the longitudinal direction translationally reciprocally movable racket, and with a drive device for the exciter sleeve, wherein the drive device comprises a drive shaft running perpendicular to the longitudinal direction and a drive pin articulated eccentrically to the longitudinal axis of this drive shaft, which acts on the exciter sleeve and converts the rotary movement of the drive shaft into a translatory drive movement for the exciter sleeve.
  • the invention relates to a striking mechanism as a component of an aforementioned hammer drill or chisel hammer.
  • non-generic rotary hammers have become known in which a technically complex and costly swash plate drive member is used ( EP 0 135 654 A1 ).
  • a hammer drill of the type mentioned is known from EP 1 674 205 A1 and shows a drive device for the exciter sleeve, which manages without a swash plate.
  • the exciter sleeve is not only translationally reciprocated in the longitudinal direction, but is also subjected to rotational movement about the longitudinal direction (back and forth). It must therefore be taken complicated measures with regard to the design of the outer periphery of the exciter sleeve and the lubrication of this tribological system, which is considered disadvantageous.
  • the present invention has for its object to improve a rotary hammer or chisel hammer of the type described above in view of the problems associated with the rotational movement of the exciter sleeve problems.
  • the drive pin thus basically performs the same movements as a result of its eccentric so eccentric articulated arrangement relative to the drive axle as in the prior art EP 1 674 205 A1 ,
  • the coupling between the drive pin and exciter sleeve of the impact mechanism is modified according to the invention such that the excitation sleeve does not participate in the pivotal movement of the drive pin in the plane perpendicular to the longitudinal direction, ie about the longitudinal axis.
  • the power tool or percussion mechanism is configured such that the drive pin protrudes in the direction of the drive shaft into an opening in the excitation sleeve or projects through an opening in the exciter sleeve, wherein the opening is such that the drive pin substantially therein only in one plane can tilt perpendicular to the longitudinal direction. Due to this Verkippbarheit in said plane germ torque is transmitted to the exciter sleeve so that it is not rotated around its longitudinal direction back and forth.
  • the drive pin is connected via a ball joint or spherical bearing with the exciter sleeve and means are provided which allow the drive pin to pivot substantially only in a plane enclosing the longitudinal direction with respect to the exciter sleeve.
  • the said means which could also be referred to as a forced guiding means, can be provided in an advantageous manner between the ball joint or the spherical bearing and the drive axle.
  • said means are provided at least almost adjacent to the exciter sleeve or to the opening or recess adjacent to the exciter sleeve.
  • these means are formed by an outer bearing shell of the ball joint or the spherical bearing, which supports the compactness of the design and locates the positive guidance means close to the exciter sleeve.
  • an outer bearing shell of the ball joint or spherical bearing is viewed in section L-shaped, wherein the short leg of the L-shape forms a means which the drive pin substantially only in a perpendicular to Longitudinally extended plane with respect to the exciter sleeve can pivot.
  • the drive pin is provided off-center to the drive shaft in an end face of a flange-shaped extension in the drive shaft.
  • the drive pin loose in an opening in the drive shaft is inserted in particular in the flange-shaped extension and is secured by a stop means against falling out.
  • a stop means is provided against falling out, the articulated connection between the drive pin and drive shaft can be made very simple and therefore advantageous. It may, for example, be a non-intrusive plug-in connection.
  • the stop means is formed by a radially projecting collar on the drive pin, which can be applied against the exciter sleeve or the ball joint or the spherical bearing.
  • the figures show a generally designated by the reference numeral 2 percussion for a hammer drill or chisel hammer drive spindle 4 and the percussion bearing or holding components, which are to represent schematically associated with the housing of the drill or chisel carrying parts 6, but only symbolically indicated are.
  • the percussion mechanism comprises an exciter sleeve 8, which is translationally reciprocable in a longitudinal direction 10 of the drive spindle 4 and of the tool device.
  • This drive device 16 includes a drive shaft 18 extending perpendicular to the longitudinal direction 10 and a drive pin 20 eccentrically with respect to a longitudinal axis 22 of the drive shaft 18, but eccentric with the drive shaft 18 via a Joint 24 is connected.
  • the drive shaft 18 includes a flange-shaped extension 26, in whose end face 28 a recess 30 is formed is, in which the drive pin 20 engages with a rounded head 32 and is pivotally movable in all orientations.
  • the drive pin 20 extends through the other end an opening 34 of a projection 36 of the exciter sleeve 8.
  • a ball joint or spherical bearing 38 through which the drive pin 20 is mounted.
  • the ball joint or spherical bearing 38 comprises a ball 39 with a cylindrical passage opening through which the drive pin 20 passes.
  • the ball joint or spherical bearing 38 would in itself allow a pivoting of the drive pin 20 with respect to all levels.
  • means 40 are provided, which the drive pin 20 substantially only in one of the 'longitudinal direction 10 enclosing plane (perpendicular to the plane of the drawing FIG. 3 ) with respect to the exciter sleeve 8 can pivot.
  • These means 40 are formed in the case exemplified by an outer bearing shell 42 of the ball joint or spherical bearing 38.
  • This outer bearing shell 42 is in the illustration of FIG. 3 L-shaped, wherein the short leg of the L-shape forms the means 40.
  • the short leg of the L-shape extends to at least almost to the outer surface of the drive pin 20 and prevents pivoting of the drive pin 20 in a longitudinal direction 10 enclosing plane (the plane of the drawing FIG. 3 ). In this way, upon rotation of the drive shaft 18, the rotational movement of the drive shaft 18 is converted into a translational reciprocating movement of the exciter sleeve 8 in the longitudinal direction 10.
  • the exciter sleeve 8 performs substantially no rotational movement, it is understood here that the exciter sleeve upon rotation of the drive shaft 18, so when switching the percussion mechanism 2 by less than 5 ° in one or the other direction to the Longitudinal direction 10 is rotated; preferably, it is rotated less than 3 ° and more preferably less than 2 ° back and forth (the angle of the pivoting segment would then be twice as large).
  • the drive pin 20 further has a radial collar 41, which serves as a stop means 43 with respect to the exciter sleeve 8 or in the case shown here with respect to the outer bearing shell 42. In this way, the drive pin 20 only loosely inserted into the recess 30 in the end face 28 of the flange-shaped extension 26 of the drive shaft 18; he is then held captive.
  • FIG. 2 From the top view in FIG. 2 and also out FIG. 3 can be seen two opposite recesses 44 in the outer Bearing shells 42, through which the top and bottom flattened ball of the ball joint or spherical bearing 38 can be inserted into the bearing shell 42.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
  • Crushing And Pulverization Processes (AREA)

Abstract

The motor driven hammer drill or impact drilling machine has a stem beater (2) with an exciter casing (8) moving in and out in a longitudinal direction (10) in translatory manner. A driven device (16) is provided for the exciter casing. A drive pin (20) is coupled directly or indirectly with the exciter casing in such a manner that the exciter casing is twisted in and out on rotation of a drive shaft (18) practically not around the longitudinal direction. An independent claim is also included for a stem beater (2) for a motor driven hammer drill or impact drilling machine, which has an exciter casing.

Description

Die Erfindung betrifft einen motorisch angetriebenen Bohrhammer oder Meißelhammer, mit einem Schlagwerk mit einer in einer Längsrichtung translatorisch hin- und her bewegbaren Erregerhülse und einem von der Erregerhülse stoßbeaufschlagten und in der Erregerhülse (8) in der Längsrichtung translatorisch hin- und her bewegbaren Schläger, und mit einer Antriebseinrichtung für die Erregerhülse, wobei die Antriebseinrichtung eine senkrecht zur Längsrichtung verlaufende Antriebswelle und einen außermittig zur Längsachse dieser Antriebswelle über ein Gelenk angelenkten Antriebsstift umfasst, welcher auf die Erregerhülse einwirkt und die drehende Bewegung der Antriebswelle in eine translatorische Antriebsbewegung für die Erregerhülse umsetzt.The invention relates to a power driven rotary hammer or chisel hammer, with a percussion mechanism with a translationally movable in a longitudinal direction and forth exciter sleeve and a shock from the exciter sleeve and in the exciter sleeve (8) in the longitudinal direction translationally reciprocally movable racket, and with a drive device for the exciter sleeve, wherein the drive device comprises a drive shaft running perpendicular to the longitudinal direction and a drive pin articulated eccentrically to the longitudinal axis of this drive shaft, which acts on the exciter sleeve and converts the rotary movement of the drive shaft into a translatory drive movement for the exciter sleeve.

Des Weiteren betrifft die Erfindung ein Schlagwerk als Komponente eines vorgenannten Bohrhammers oder Meißelhammers.Furthermore, the invention relates to a striking mechanism as a component of an aforementioned hammer drill or chisel hammer.

Beispielsweise sind nicht gattungsgemäße Bohrhämmer bekannt geworden, bei denen ein technisch aufwändiges und kostenintensives Taumelscheibenantriebsglied verwendet wird ( EP 0 135 654 A1 ).For example, non-generic rotary hammers have become known in which a technically complex and costly swash plate drive member is used ( EP 0 135 654 A1 ).

Ein Bohrhammer der eingangs genannten Art ist bekannt aus EP 1 674 205 A1 und zeigt eine Antriebseinrichtung für die Erregerhülse, die ohne eine Taumelscheibe auskommt. Bei dieser vorbekannten Lösung wird die Erregerhülse aber nicht nur in der Längsrichtung translatorisch hin- und herbewegt, sondern sie wird auch einer Drehbewegung um die Längsrichtung herum (hin- und her) unterworfen. Es müssen daher aufwändige Maßnahmen im Hinblick auf die Gestaltung des Außenumfangs der Erregerhülse und der Schmierung dieses tribologischen Systems ergriffen werden, was als nachteilig angesehen wird.A hammer drill of the type mentioned is known from EP 1 674 205 A1 and shows a drive device for the exciter sleeve, which manages without a swash plate. In this prior art solution, however, the exciter sleeve is not only translationally reciprocated in the longitudinal direction, but is also subjected to rotational movement about the longitudinal direction (back and forth). It must therefore be taken complicated measures with regard to the design of the outer periphery of the exciter sleeve and the lubrication of this tribological system, which is considered disadvantageous.

Der vorliegenden Erfindung liegt die Aufgabe zur Grunde, einen Bohrhammer oder Meißelhammer der eingangs beschriebenen Art im Hinblick auf die im Zusammenhang mit der Drehbewegung der Erregerhülse stehenden Probleme zu verbessern.The present invention has for its object to improve a rotary hammer or chisel hammer of the type described above in view of the problems associated with the rotational movement of the exciter sleeve problems.

Diese Aufgabe wird ausgehend von einem Bohrhammer oder einem Meißelhammer der genannten Art erfindungsgemäß dadurch gelöst, dass der Antriebsstift so mit der Erregerhülse unmittelbar oder mittelbar gekoppelt ist, dass die Erregerhülse bei Umdrehung der Antriebswelle praktisch nicht um die Längsrichtung hin- und her verdreht wird.This object is achieved on the basis of a rotary hammer or a chisel hammer of the type mentioned in that the drive pin is coupled directly or indirectly with the excitation sleeve so that the exciter sleeve is practically not rotated around the longitudinal direction back and forth upon rotation of the drive shaft.

Der Antriebsstift führt also grundsätzlich dieselben Bewegungen in Folge seiner außermittigen also exzentrischen gelenkigen Anordnung relativ zur Antriebsachse aus wie bei der vorbekannten EP 1 674 205 A1 . Jedoch wird die Kopplung zwischen Antriebsstift und Erregerhülse des Schlagwerks erfindungsgemäß so modifiziert, dass die Erregerhülse die Schwenkbewegung des Antriebsstifts in der Ebene senkrecht zur Längsrichtung, also um die Längsachse herum nicht mit macht. Nach einer ersten Ausführungsform der Erfindung ist das Werkzeuggerät beziehungsweise das Schlagwerk so ausgebildet, dass der Antriebsstift in Richtung der Antriebswelle in eine Öffnung bei der Erregerhülse einragt oder eine Öffnung bei der Erregerhülse durchragt, wobei die Öffnung so beschaffen ist, dass der Antriebsstift darin im Wesentlichen nur in einer Ebene senkrecht zur Längsrichtung verkippen kann. Durch diese Verkippbarheit in der genannten Ebene wird keim Drehmoment auf die Erregerhülse übertragen, so dass diese nicht um Ihre Längsrichtung hin- und her verdreht wird.The drive pin thus basically performs the same movements as a result of its eccentric so eccentric articulated arrangement relative to the drive axle as in the prior art EP 1 674 205 A1 , However, the coupling between the drive pin and exciter sleeve of the impact mechanism is modified according to the invention such that the excitation sleeve does not participate in the pivotal movement of the drive pin in the plane perpendicular to the longitudinal direction, ie about the longitudinal axis. According to a first embodiment of the invention, the power tool or percussion mechanism is configured such that the drive pin protrudes in the direction of the drive shaft into an opening in the excitation sleeve or projects through an opening in the exciter sleeve, wherein the opening is such that the drive pin substantially therein only in one plane can tilt perpendicular to the longitudinal direction. Due to this Verkippbarheit in said plane germ torque is transmitted to the exciter sleeve so that it is not rotated around its longitudinal direction back and forth.

Nach einer weiteren bevorzugten Ausführungsform der Erfindung ist der Antriebsstift über ein Kugelgelenk oder Kalottenlager mit der Erregerhülse verbunden und es sind Mittel vorgesehen, die den Antriebsstift im Wesentlichen nur in einer die Längsrichtung einschließenden Ebene bezüglich der Erregerhülse verschwenken lassen.According to a further preferred embodiment of the invention, the drive pin is connected via a ball joint or spherical bearing with the exciter sleeve and means are provided which allow the drive pin to pivot substantially only in a plane enclosing the longitudinal direction with respect to the exciter sleeve.

Es erweist sich hier als vorteilhaft, wenn das Kugelgelenk oder Kalottenlager in einer Öffnung oder Ausnehmung bei der Erregerhülse angeordnet ist.It proves to be advantageous here if the ball joint or spherical bearing is arranged in an opening or recess in the exciter sleeve.

Die genannten Mittel, die auch als Zwangsführungsmittel bezeichnet werden könnten, können in vorteilhafter Weise zwischen dem Kugelgelenk oder dem Kalottenlager und der Antriebsachse vorgesehen sein.The said means, which could also be referred to as a forced guiding means, can be provided in an advantageous manner between the ball joint or the spherical bearing and the drive axle.

Anstelle eines Kugelgelenks oder Kalottenlagers in Verbindung mit den genannten Zwangsführungsmitteln könnte auch eine nur in einer Ebene wirksame Drehgelenkanordnung zwischen Antriebsstift und Erregerhülse gewählt werden. Auch die Verwendung eines zwar sphärischen Gelenks, welches aber nur in einer Ebene schwenkbar ist, wäre denkbar.Instead of a ball joint or spherical bearing in conjunction with said positive guide means and an effective only in one plane pivot assembly between drive pin and exciter sleeve could be selected. Also, the use of a true spherical joint, but which is pivotable only in one plane, would be conceivable.

Des Weiteren erweist es sich als vorteilhaft, wenn die genannten Mittel wenigstens nahezu an die Erregerhülse oder an die Öffnung oder Ausnehmung bei der Erregerhülse angrenzend vorgesehen sind.Furthermore, it proves to be advantageous if said means are provided at least almost adjacent to the exciter sleeve or to the opening or recess adjacent to the exciter sleeve.

Nach einer besonders vorteilhaften Ausführungsform sind diese Mittel von einer äußeren Lagerschale des Kugelgelenks oder des Kalottenlagers gebildet, was die Kompaktheit der Bauform unterstützt und das Zwangsführungsmittel nahe an der Erregerhülse lokalisiert.According to a particularly advantageous embodiment, these means are formed by an outer bearing shell of the ball joint or the spherical bearing, which supports the compactness of the design and locates the positive guidance means close to the exciter sleeve.

In vorteilhafter Weiterbildung dieses Erfindungsgedankens erweist es sich als vorteilhaft, wenn eine äußere Lagerschale des Kugelgelenks oder Kalottenlagers im Schnitt betrachtet L-förmig ausgebildet ist, wobei der kurze Schenkel der L-Form ein Mittel bildet, welches den Antriebsstift im Wesentlichen nur in einer senkrecht zur Längsrichtung erstreckten Ebene bezüglich der Erregerhülse verschwenken lässt.In an advantageous embodiment of this inventive concept, it proves to be advantageous if an outer bearing shell of the ball joint or spherical bearing is viewed in section L-shaped, wherein the short leg of the L-shape forms a means which the drive pin substantially only in a perpendicular to Longitudinally extended plane with respect to the exciter sleeve can pivot.

Nach einer zweckmäßigen Ausführungsform ist der Antriebsstift außermittig zu der Antriebswelle in einer Stirnseite einer flanschförmigen Erweiterung bei der Antriebswelle vorgesehen.According to an expedient embodiment, the drive pin is provided off-center to the drive shaft in an end face of a flange-shaped extension in the drive shaft.

Des Weiteren erweist es sich als vorteilhaft, wenn der Antriebsstift lose in eine Öffnung bei der Antriebswelle, insbesondere in die flanschförmige Erweiterung eingesteckt ist und durch ein Anschlagmittel gegen Herausfallen gesichert ist. Dadurch, dass ein Anschlagmittel gegen Herausfallen vorgesehen ist, kann die gelenkige Verbindung zwischen Antriebsstift und Antriebswelle sehr einfach und daher vorteilhaft ausgebildet werden. Es kann sich beispielsweise um eine hintergriffsfreie Einsteckverbindung handeln.Furthermore, it proves to be advantageous if the drive pin loose in an opening in the drive shaft, is inserted in particular in the flange-shaped extension and is secured by a stop means against falling out. Characterized in that a stop means is provided against falling out, the articulated connection between the drive pin and drive shaft can be made very simple and therefore advantageous. It may, for example, be a non-intrusive plug-in connection.

In Weiterbildung dieses Erfindungsgedankens erweist es sich als vorteilhaft, wenn das Anschlagmittel von einem radial vorstehenden Bund an dem Antriebsstift gebildet ist, der gegen die Erregerhülse oder das Kugelgelenk oder das Kalottenlager anlegbar ist.In a further development of this inventive concept, it proves to be advantageous if the stop means is formed by a radially projecting collar on the drive pin, which can be applied against the exciter sleeve or the ball joint or the spherical bearing.

Des Weiteren wird Schutz beansprucht für ein Schlagwerk mit den Merkmalen des Anspruchs 12.Furthermore, protection is claimed for a hammer mechanism with the features of claim 12.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus den beigefügten Patentansprüchen und aus der zeichnerischen Darstellung und nachfolgenden Beschreibung einer bevorzugten Ausführungsform des Schlagwerks bei einem erfindungsgemäßen Werkzeuggerät. In der Zeichnung zeigt:

Figur 1
eine perspektivische schematische Darstellung des Schlagwerks mit Antriebsspindel eines erfindungsgemäßen Bohrhammers;
Figur 2
eine Draufsicht auf das Schlagwerk nach Figur 1;
Figur 3
eine Längsschnittansicht mit Schnittebene A-A in Figur 2 und
Figur 4
eine Schnittansicht mit Schnittebene B-B in Figur 3.
Further features, details and advantages of the invention will become apparent from the appended claims and from the drawings and the following description of a preferred embodiment of the impact mechanism in a tool according to the invention. In the drawing shows:
FIG. 1
a perspective schematic view of the hammer mechanism with drive spindle of a hammer drill according to the invention;
FIG. 2
a top view of the percussion after FIG. 1 ;
FIG. 3
a longitudinal sectional view with sectional plane AA in FIG. 2 and
FIG. 4
a sectional view with sectional plane BB in FIG. 3 ,

Die Figuren zeigen ein insgesamt mit dem Bezugszeichen 2 bezeichnetes Schlagwerk für einen Bohrhammer oder Meißelhammer mit Antriebsspindel 4 und mit das Schlagwerk tragenden oder haltenden Komponenten, welche schematisch mit dem Gehäuse des Bohr- Oder Meißelhammers verbundene tragende Teile 6 darstellen sollen, die jedoch nur symbolisch angedeutet sind. Das Schlagwerk umfasst eine Erregerhülse 8, die in einer Längsrichtung 10 der Antriebsspindel 4 und des Werkzeuggeräts translatorisch hin- und herbewegbar ist. Innerhalb der Erregerhülse 8 ist ein nicht dargestellter Schläger ebenfalls in der Längsrichtung 10 stoßbeaufschlagt hin- und herbewegbar, wobei das Schlagwerk 2 unter Verwendung der Erregerhülse 8 und des Schlägers als sogenanntes Luftpolsterschlagwerk ausgebildet ist, was an sich bekannt ist und daher keiner näheren Beschreibung bedarf.The figures show a generally designated by the reference numeral 2 percussion for a hammer drill or chisel hammer drive spindle 4 and the percussion bearing or holding components, which are to represent schematically associated with the housing of the drill or chisel carrying parts 6, but only symbolically indicated are. The percussion mechanism comprises an exciter sleeve 8, which is translationally reciprocable in a longitudinal direction 10 of the drive spindle 4 and of the tool device. Within the exciter sleeve 8, a racket, not shown, also in the longitudinal direction 10 impact-reciprocated back and forth, wherein the hammer mechanism 2 is formed using the exciter sleeve 8 and the racket as so-called Luftpolsterschlagwerk, which is known per se and therefore requires no further description.

Ferner dargestellt ist ein sogenannter Döpper 12, welcher die Stoßbeaufschlagung vom Schläger auf ein beschränkt axial bewegbares Werkzeug überträgt, welches in eine Einstecköffnung 14 in der Antriebsspindel 4 eingesteckt werden kann. Des Weiteren umfasst das Schlagwerk 2 eine Antriebseinrichtung 16 für die Erregerhülse 8. Diese Antriebseinrichtung 16 umfasst eine zur Längsrichtung 10 senkrecht verlaufende Antriebswelle 18 und einen Antriebsstift 20, der bezüglich einer Längsachse 22 der Antriebswelle 18 außermittig, also exzentrisch jedoch mit der Antriebswelle 18 über ein Gelenk 24 verbunden ist. Die Antriebswelle 18 umfasst eine flanschförmige Erweiterung 26, in deren Stirnseite 28 eine Ausnehmung 30 ausgebildet ist, in die der Antriebsstift 20 mit einem verrundeten Kopf 32 eingreift und darin in alle Orientierungen schwenkbeweglich ist.Also shown is a so-called striker 12, which transmits the impact of the racket on a limited axially movable tool, which can be inserted into an insertion opening 14 in the drive spindle 4. This drive device 16 includes a drive shaft 18 extending perpendicular to the longitudinal direction 10 and a drive pin 20 eccentrically with respect to a longitudinal axis 22 of the drive shaft 18, but eccentric with the drive shaft 18 via a Joint 24 is connected. The drive shaft 18 includes a flange-shaped extension 26, in whose end face 28 a recess 30 is formed is, in which the drive pin 20 engages with a rounded head 32 and is pivotally movable in all orientations.

Der Antriebsstift 20 durchragt anderenends eine Öffnung 34 eines Ansatzes 36 der Erregerhülse 8. In diese Öffnung 34 eingesetzt ist ein Kugelgelenk oder Kalottenlager 38, durch welches der Antriebsstift 20 gelagert ist. Das Kugelgelenk oder Kalottenlager 38 umfasst eine Kugel 39 mit einer zylindrischen Durchgangsöffnung, durch die der Antriebsstift 20 hindurchtritt. Das Kugelgelenk oder Kalottenlager 38 würde an sich eine Verschwenkung des Antriebsstifts 20 bezüglich aller Ebenen erlauben. Zusätzlich sind aber Mittel 40 vorgesehen, welche den Antriebsstift 20 im Wesentlichen nur in einer die ' Längsrichtung 10 einschließenden Ebene (senkrecht zur Zeichnungsebene der Figur 3) bezüglich der Erregerhülse 8 verschwenken lassen. Diese Mittel 40 sind im beispielhaft dargestellten Fall von einer äußeren Lagerschale 42 des Kugelgelenks oder Kalottenlagers 38 gebildet. Diese äußere Lagerschale 42 ist in der Darstellung der Figur 3 L-förmig ausgebildet, wobei der kurze Schenkel der L-Form das Mittel 40 bildet. Der kurze Schenkel der L-Form reicht bis wenigstens nahezu an die äußere Mantelfläche des Antriebsstifts 20 heran und verhindert ein Verschwenken des Antriebsstifts 20 in einer die Längsrichtung 10 einschließenden Ebene (die Zeichnungsebene der Figur 3). Auf diese Weise wird bei Umdrehung der Antriebswelle 18 die Drehbewegung der Antriebswelle 18 in eine translatorische Hin- und Herbewegung der Erregerhülse 8 in der Längsrichtung 10 umgesetzt. Dadurch, dass der Antriebsstift 20 aber über das Kugelgelenk oder Kalottenlager 38 um die Längsrichtung 10, also senkrecht zur Zeichnungsebene der Figur 3 bezüglich der Erregerhülse 8 verkippen kann, wird im Wesentlichen kein Dreh- oder Schwenkmoment auf die Erregerhülse 8 übertragen, so dass die Erregerhülse 8 im Zuge ihrer translatorischen Hin- und Herbewegung in Längsrichtung 10 praktisch nicht um die Längsrichtung 10 hin- und her verdreht wird, was erhebliche Vorteile im Hinblick auf die Dimensionierung des tribologischen Systems aus Erregerhülse 8 und Antriebsspindel 4 mit sich bringt. Wenn vorstehend davon die Rede ist, dass die Erregerhülse 8 im Wesentlichen keine Drehbewegung ausführt, so wird hierunter verstanden, dass die Erregerhülse bei Umdrehung der Antriebswelle 18, also bei Einschalten des Schlagwerks 2 um weniger als 5° in die eine oder andere Richtung um die Längsrichtung 10 verdreht wird; vorzugsweise wird sie um weniger als 3° und weiter vorzugsweise um weniger als 2° hin- und her verdreht(der Winkel des Schwenksegments wäre dann jeweils doppelt so groß).The drive pin 20 extends through the other end an opening 34 of a projection 36 of the exciter sleeve 8. In this opening 34 is inserted a ball joint or spherical bearing 38, through which the drive pin 20 is mounted. The ball joint or spherical bearing 38 comprises a ball 39 with a cylindrical passage opening through which the drive pin 20 passes. The ball joint or spherical bearing 38 would in itself allow a pivoting of the drive pin 20 with respect to all levels. In addition, however, means 40 are provided, which the drive pin 20 substantially only in one of the 'longitudinal direction 10 enclosing plane (perpendicular to the plane of the drawing FIG. 3 ) with respect to the exciter sleeve 8 can pivot. These means 40 are formed in the case exemplified by an outer bearing shell 42 of the ball joint or spherical bearing 38. This outer bearing shell 42 is in the illustration of FIG. 3 L-shaped, wherein the short leg of the L-shape forms the means 40. The short leg of the L-shape extends to at least almost to the outer surface of the drive pin 20 and prevents pivoting of the drive pin 20 in a longitudinal direction 10 enclosing plane (the plane of the drawing FIG. 3 ). In this way, upon rotation of the drive shaft 18, the rotational movement of the drive shaft 18 is converted into a translational reciprocating movement of the exciter sleeve 8 in the longitudinal direction 10. Due to the fact that the drive pin 20 but about the ball joint or spherical bearing 38 about the longitudinal direction 10, that is perpendicular to the plane of the drawing FIG. 3 with respect to the exciter sleeve 8 can tilt, is essentially no turning or pivoting moment on the Transmitted exciter sleeve 8, so that the exciter sleeve 8 in the course of their translational reciprocating motion in the longitudinal direction 10 is not twisted back and forth about the longitudinal direction 10, which has considerable advantages in terms of the dimensioning of the tribological system of exciter sleeve 8 and drive spindle. 4 brings with it. If it is mentioned above that the exciter sleeve 8 performs substantially no rotational movement, it is understood here that the exciter sleeve upon rotation of the drive shaft 18, so when switching the percussion mechanism 2 by less than 5 ° in one or the other direction to the Longitudinal direction 10 is rotated; preferably, it is rotated less than 3 ° and more preferably less than 2 ° back and forth (the angle of the pivoting segment would then be twice as large).

Betrachtet man die Schnittdarstellung der Figur 4, so erkennt man, dass die äußere Lagerschale 42 auf der Seite zur Antriebswelle 18 keine L-Form aufweist. Der Antriebsstift 20 kann also bezüglich der Zeichnungsebene der Figur 4 in dem Kugelgelenk oder Kalottenlager 38 verschwenken, ohne dass diese Schwenkbewegung auf den Ansatz 36 der Erregerhülse 8 übertragen wird.Looking at the sectional view of FIG. 4 , it can be seen that the outer bearing shell 42 on the side of the drive shaft 18 has no L-shape. The drive pin 20 can therefore with respect to the plane of the FIG. 4 pivot in the ball joint or spherical bearing 38, without this pivotal movement is transmitted to the neck 36 of the exciter sleeve 8.

Der Antriebsstift 20 weist ferner einen radialen Bund 41 auf, der als Anschlagmittel 43 gegenüber der Erregerhülse 8 bzw. im hier dargestellten Fall gegenüber der äußeren Lagerschale 42 dient. Auf diese Weise braucht der Antriebsstift 20 nur lose in die Ausnehmung 30 in der Stirnseite 28 der flanschförmigen Erweiterung 26 der Antriebswelle 18 eingesteckt zu werden; er ist dann verliersicher gehalten.The drive pin 20 further has a radial collar 41, which serves as a stop means 43 with respect to the exciter sleeve 8 or in the case shown here with respect to the outer bearing shell 42. In this way, the drive pin 20 only loosely inserted into the recess 30 in the end face 28 of the flange-shaped extension 26 of the drive shaft 18; he is then held captive.

Aus der Draufsicht in Figur 2 und auch aus Figur 3 erkennt man zwei gegenüberliegende Ausnehmungen 44 in den äußeren Lagerschalen 42, durch welche die oben und unten abgeflachte Kugel des Kugelgelenks oder Kalottenlagers 38 in die Lagerschale 42 eingesetzt werden kann.From the top view in FIG. 2 and also out FIG. 3 can be seen two opposite recesses 44 in the outer Bearing shells 42, through which the top and bottom flattened ball of the ball joint or spherical bearing 38 can be inserted into the bearing shell 42.

Das außen auf der Antriebsspindel 4 sitzende Zahnrad 46 und eine angedeutete Kupplungseinrichtung 48 dienen dem Drehantrieb der Antriebsspindel 4.The outside seated on the drive spindle 4 gear 46 and an indicated clutch means 48 serve the rotary drive of the drive spindle 4th

Claims (12)

Motorisch angetriebener Bohrhammer oder Meißelhammer, mit einem Schlagwerk (2) mit einer in einer Längsrichtung (10) translatorisch hin- und her bewegbaren Erregerhülse (8) und einem von der Erregerhülse (8) stoßbeaufschlagten und in der Erregerhülse (8) in der Längsrichtung (10) translatorisch hin- und her bewegbaren Schläger, und mit einer Antriebseinrichtung (16) für die Erregerhülse (8), wobei die Antriebseinrichtung (16) eine senkrecht zur Längsrichtung (10) verlaufende Antriebswelle (18) und einen außermittig zur Längsachse (22) dieser Antriebswelle (18) über ein Gelenk (24) angelenkten Antriebsstift (20) umfasst, welcher auf die Erregerhülse (8) einwirkt und die drehende Bewegung der Antriebswelle (18) in eine translatorische Antriebsbewegung für die Erregerhülse (8) umsetzt, dadurch gekennzeichnet, dass der Antriebsstift (20) so mit der Erregerhülse (8) unmittelbar oder mittelbar gekoppelt ist, dass die Erregerhülse (8) bei Umdrehung der Antriebswelle (18) praktisch nicht um die Längsrichtung (10) hin- und her verdreht wird.Motor-driven hammer drill or chisel hammer, comprising a percussion mechanism (2) with an exciter sleeve (8) which can be moved back and forth in a longitudinal direction (10) and is impact-loaded by the exciter sleeve (8) and longitudinally in the exciter sleeve (8). 10) translationally reciprocable beaters, and with a drive device (16) for the excitation sleeve (8), wherein the drive device (16) has a perpendicular to the longitudinal direction (10) extending drive shaft (18) and an off-center to the longitudinal axis (22). this drive shaft (18) via a hinge (24) hinged drive pin (20) which acts on the exciter sleeve (8) and converts the rotary movement of the drive shaft (18) in a translatory drive movement for the exciter sleeve (8), characterized in that the drive pin (20) is coupled directly or indirectly with the exciter sleeve (8) in such a way that the exciter sleeve (8) primes upon rotation of the drive shaft (18) is not actically rotated about the longitudinal direction (10) back and forth. Bohr- oder Meißelhammer nach Anspruch 1, dadurch gekennzeichnet, dass der Antriebsstift (20) in Richtung der Antriebswelle (18) in eine Öffnung (34) bei der Erregerhülse (8) einragt oder eine Öffnung (34) bei der Erregerhülse (8) durchragt, wobei die Öffnung (34) so beschaffen ist, dass der Antriebsstift (20) darin im Wesentlichen nur in einer Ebene senkrecht zur Längsrichtung (10) verkippen kann.Drill or chipping hammer according to claim 1, characterized in that the drive pin (20) protrudes in the direction of the drive shaft (18) in an opening (34) in the exciter sleeve (8) or through an opening (34) in the exciter sleeve (8) wherein the opening (34) is such that the drive pin (20) can tilt therein substantially only in a plane perpendicular to the longitudinal direction (10). Bohr- oder Meißelhammer nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Antriebsstift (20) über ein Kugelgelenk oder Kalottenlager (38) mit der Erregerhülse (8) verbunden ist und Mittel (40) vorgesehen sind, die den Antriebsstift (20) im Wesentlichen nur in einer die Längsrichtung (10) einschließenden Ebene bezüglich der Erregerhülse (8) verschwenken lassen.Drill or chisel hammer according to claim 1 or 2, characterized in that the drive pin (20) via a ball joint or spherical bearing (38) with the exciter sleeve (8) is connected and means (40) are provided which the drive pin (20) in Pivot substantially only in a plane enclosing the longitudinal direction (10) with respect to the exciter sleeve (8). Bohr- oder Meißelhammer nach Anspruch 3, dadurch gekennzeichnet, dass das Kugelgelenk oder Kalottenlager (38) in einer Öffnung (34) oder Ausnehmung bei der Erregerhülse (8) angeordnet ist.Drill or chisel hammer according to claim 3, characterized in that the ball joint or spherical bearing (38) in an opening (34) or recess in the exciter sleeve (8) is arranged. Bohr- oder Meißelhammer nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Mittel (40) zwischen dem Kugelgelenk oder dem Kalottenlager (38) und der Antriebswelle (18) vorgesehen sind.Drill or chisel hammer according to claim 3 or 4, characterized in that the means (40) between the ball joint or the spherical bearing (38) and the drive shaft (18) are provided. Bohr- oder Meißelhammer nach einem der vorstehenden Ansprüche 3-5, dadurch gekennzeichnet, dass die Mittel (40) wenigstens nahezu an die Erregerhülse (8) oder an die Öffnung (34) oder Ausnehmung bei der Erregerhülse (8) angrenzend vorgesehen sind.Drill or chisel hammer according to one of the preceding claims 3-5, characterized in that the means (40) are provided at least almost adjacent to the exciter sleeve (8) or to the opening (34) or recess in the exciter sleeve (8). Bohr- oder Meißelhammer nach einem der vorstehenden Ansprüche 3-6, dadurch gekennzeichnet, dass die Mittel (40) von einer äußeren Lagerschale (42) des Kugelgelenks oder Kalottenlagers (38) gebildet sind.Drill or chisel hammer according to one of the preceding claims 3-6, characterized in that the means (40) of an outer bearing shell (42) of the ball joint or spherical bearing (38) are formed. Bohr- oder Meißelhammer nach einem der vorstehenden Ansprüche 3-7, dadurch gekennzeichnet, dass eine äußeren Lagerschale (42) des Kugelgelenks oder Kalottenlagers (38) im Schnitt betrachtet L-förmig ausgebildet ist, wobei der kurze Schenkel der L-Form ein Mittel (40) bildet, welches den Antriebsstift (20) im Wesentlichen nur in einer senkrecht zur Längsrichtung (10) erstreckten Ebene bezüglich der Erregerhülse (8) verschwenken lässt.Chisel or hammer according to one of the preceding claims 3-7, characterized in that an outer bearing shell (42) of the ball joint or spherical bearing (38) is viewed in section L-shaped, wherein the short leg of the L-shape means ( 40) which forms the drive pin (20) substantially only in a direction perpendicular to Lateral (10) extending plane with respect to the exciter sleeve (8) can pivot. Bohr - oder Meißelhammer nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Antriebsstift (20) außermittig zu der Antriebswelle (18) in einer Stirnseite (28) einer flanschförmigen Erweiterung (26) bei der Antriebswelle (18) vorgesehen ist außermittig zu der Antriebswelle (18) in einer Stirnseite (28) einer flanschförmigen Erweiterung (26) bei der Antriebswelle (18) vorgesehen ist.Chisel or chisel hammer according to one of the preceding claims, characterized in that the drive pin (20) off-center to the drive shaft (18) in an end face (28) of a flange-shaped extension (26) at the drive shaft (18) is provided off-center to the drive shaft (18) in an end face (28) of a flange-shaped extension (26) in the drive shaft (18) is provided. Bohr- oder Meißelhammer nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Antriebsstift (20) lose in eine Öffnung (30) bei der Antriebswelle (18), insbesondere in die flanschförmige Erweiterung (26) eingesteckt ist und durch ein Anschlagmittel (43) gegen Herausfallen gesichert ist.Drill or chipping hammer according to one of the preceding claims, characterized in that the drive pin (20) is loosely inserted into an opening (30) in the drive shaft (18), in particular in the flange-shaped extension (26) and by a stop means (43). is secured against falling out. Bohr- oder Meißelhammer nach Anspruch 10, dadurch gekennzeichnet, dass das Anschlagmittel (43) von einem radial vorstehenden Bund (41) an dem Antriebsstift (20) gebildet ist, der gegen die Erregerhülse (8) oder das Kugelgelenk oder das Kalottenlager (42) anlegbar ist.Hammer or chisel hammer according to claim 10, characterized in that the stop means (43) by a radially projecting collar (41) on the drive pin (20) is formed, which against the exciter sleeve (8) or the ball joint or the spherical bearing (42). can be applied. Schlagwerk (2) für einen motorisch angetriebenen Bohr- oder Meißelhammer, mit einer in einer Längsrichtung (10) translatorisch hin- und her bewegbaren Erregerhülse (8) und einem von der Erregerhülse (8) stoßbeaufschlagten und in der Erregerhülse (8) in der Längsrichtung (10) translatorisch hin- und her bewegbaren Schläger, und mit einer Antriebseinrichtung (16) für die Erregerhülse (8), wobei die Antriebseinrichtung (16) eine senkrecht zur Längsrichtung (10) verlaufende Antriebswelle (18) und einen außermittig zur Längsachse (22) dieser Antriebswelle (18) über ein Gelenk angelenkten Antriebsstift (20) umfasst, welcher auf die Erregerhülse (8) einwirkt und die drehende Bewegung der Antriebswelle (18) in eine translatorische Antriebsbewegung für die Erregerhülse (8) umsetzt, dadurch gekennzeichnet, dass der Antriebsstift (20) so mit der Erregerhülse (8) unmittelbar oder mittelbar gekoppelt ist, dass die Erregerhülse (8) bei Umdrehung der Antriebswelle (18) praktisch nicht um die Längsrichtung (10) hin- und her verdreht wird.Impact device (2) for a motor-driven drill or chisel hammer, with a in a longitudinal direction (10) translationally reciprocable exciter sleeve (8) and one of the exciter sleeve (8) impact-loaded and in the exciter sleeve (8) in the longitudinal direction (10) translationally reciprocable racket, and with a drive means (16) for the exciter sleeve (8), wherein the drive means (16) perpendicular to the longitudinal direction (10) extending drive shaft (18) and an eccentric to the longitudinal axis (22) of said drive shaft (18) via a hinge hinged drive pin (20) which acts on the exciter sleeve (8) and converts the rotary movement of the drive shaft (18) in a translational drive movement for the exciter sleeve (8) , characterized in that the drive pin (20) with the exciter sleeve (8) is directly or indirectly coupled, that the exciter sleeve (8) upon rotation of the drive shaft (18) practically not around the longitudinal direction (10) back and forth twisted ,
EP07001555A 2007-01-25 2007-01-25 Striking mechanism for a chisel tool or a hammer drill; chisel tool or hammer drill Not-in-force EP1949992B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07001555A EP1949992B1 (en) 2007-01-25 2007-01-25 Striking mechanism for a chisel tool or a hammer drill; chisel tool or hammer drill
DE502007003926T DE502007003926D1 (en) 2007-01-25 2007-01-25 Striking mechanism for a drill or chisel hammer; Drill or chisel hammer
AT07001555T ATE468935T1 (en) 2007-01-25 2007-01-25 IMPACT MECHANISM FOR A DRILL OR CHIP HAMMER; DRILL OR CHIP HAMMER

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07001555A EP1949992B1 (en) 2007-01-25 2007-01-25 Striking mechanism for a chisel tool or a hammer drill; chisel tool or hammer drill

Publications (2)

Publication Number Publication Date
EP1949992A1 true EP1949992A1 (en) 2008-07-30
EP1949992B1 EP1949992B1 (en) 2010-05-26

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Application Number Title Priority Date Filing Date
EP07001555A Not-in-force EP1949992B1 (en) 2007-01-25 2007-01-25 Striking mechanism for a chisel tool or a hammer drill; chisel tool or hammer drill

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AT (1) ATE468935T1 (en)
DE (1) DE502007003926D1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2038986A (en) * 1978-12-13 1980-07-30 Black & Decker Inc Converting rotary motion to reciprocatory motion
EP0135654A1 (en) * 1983-09-29 1985-04-03 Licentia Patent-Verwaltungs-GmbH Guide of the piston of a hand-held air cushion percussion drill
WO1996005031A1 (en) * 1994-08-17 1996-02-22 Ryobi Motor Products Corporation Reciprocated drive saw mechanism
EP1674205A1 (en) * 2004-12-23 2006-06-28 BLACK & DECKER INC. Drive mechanism for power tool
EP1674206A1 (en) * 2004-12-23 2006-06-28 BLACK & DECKER INC. Hammer mechanism for power tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2038986A (en) * 1978-12-13 1980-07-30 Black & Decker Inc Converting rotary motion to reciprocatory motion
EP0135654A1 (en) * 1983-09-29 1985-04-03 Licentia Patent-Verwaltungs-GmbH Guide of the piston of a hand-held air cushion percussion drill
WO1996005031A1 (en) * 1994-08-17 1996-02-22 Ryobi Motor Products Corporation Reciprocated drive saw mechanism
EP1674205A1 (en) * 2004-12-23 2006-06-28 BLACK & DECKER INC. Drive mechanism for power tool
EP1674206A1 (en) * 2004-12-23 2006-06-28 BLACK & DECKER INC. Hammer mechanism for power tool

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EP1949992B1 (en) 2010-05-26
ATE468935T1 (en) 2010-06-15
DE502007003926D1 (en) 2010-07-08

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