EP2253430B1 - Electric tool machine, in particular handheld hammer drill - Google Patents

Electric tool machine, in particular handheld hammer drill Download PDF

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Publication number
EP2253430B1
EP2253430B1 EP10005204A EP10005204A EP2253430B1 EP 2253430 B1 EP2253430 B1 EP 2253430B1 EP 10005204 A EP10005204 A EP 10005204A EP 10005204 A EP10005204 A EP 10005204A EP 2253430 B1 EP2253430 B1 EP 2253430B1
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EP
European Patent Office
Prior art keywords
handle
tool machine
electric tool
main handle
machine according
Prior art date
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EP10005204A
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German (de)
French (fr)
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EP2253430A1 (en
Inventor
Gerhardt Schroth
Frank Nothacker
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Friedrich Duss Maschinenfabrik & Co KG GmbH
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Friedrich Duss Maschinenfabrik & Co KG GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B25F5/025—Construction of casings, bodies or handles with torque reaction bars for rotary tools
    • B25F5/026—Construction of casings, bodies or handles with torque reaction bars for rotary tools in the form of an auxiliary handle
    • 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
    • B25D17/04—Handles; Handle mountings
    • B25D17/043—Handles resiliently mounted relative to the hammer housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/006—Vibration damping means

Definitions

  • the invention relates to a power tool, in particular a hand-held hammer drill according to the preamble of claim 1.
  • a tool is guided in a tool holder of such a power tool, so that the device can be used, for example, as a drill, chisel or percussion hammer.
  • the machine tool thus forms a vibration system which is excited during operation by the drive arrangement for the tool.
  • the decoupling device is arranged in this power tool between main handle and housing.
  • An attachment for an additional handle is provided, however, this attachment is located on the housing of the machine.
  • a drive unit drives a drive axle. Facing away from a tool, a saw chain, a main handle arranged transversely to the drive axis is provided, which is decoupled from the drive unit by a vibration decoupling. Furthermore, the additional handle, which is also decoupled via the decoupling device, is provided. As a result, the comfort when holding the device can be improved, which in turn allows a longer work without fatigue of the operator.
  • a power tool in which a dynamic vibration reducer is arranged in the machine housing.
  • a vibration absorber comprises at least a weight and at least one elastic element, wherein the elastic element is arranged between the weight and the housing and serves to exert a biasing force on the weight.
  • the weight reciprocates against the biasing force of the elastic member upon actuation of the machine along the drive axis for the tool.
  • the dynamic vibration reducer reduces vibrations in the housing in the longitudinal direction of the tool be generated during work.
  • the DE 21 2005 000 027 U1 proposes various arrangements for such a vibration damper, such as, for example, an arrangement in the transition region between the main handle and the housing.
  • the present invention has the object, a power tool in such a way that a reliable vibration and vibration decoupling is also possible when using an additional handle and for this additional handle.
  • a mounting option for an additional handle is provided on the main handle, creating a "compressor position" during operation of the machine tool is possible, ie with both hands the machine can be performed in the area of the main handle.
  • the arrangement of the decoupling device under the handle allows a decoupling of the auxiliary handle.
  • the decoupling device is preferably designed in multiple stages.
  • a normal position i. when guiding the machine with one hand and possibly another hand on the further handle near the tool holder, e.g. when working horizontally only a first stage of the spring elements acts, while in the compressor position, in which the pressure on the handle is greater overall, a reinforced suspension acts through a second stage of elastic elements.
  • Both the decoupling device and optionally a vibration damper are preferably arranged in the transition region between the main handle and the drive arrangement or housing.
  • the area in which the device is guided significantly damped in terms of vibration and vibration, so that a longer tamper-free operation is possible.
  • the decoupling device and vibration absorber are preferably arranged as a damping unit in a region which is required for ergonomic reasons for the operation of the machine in the transition region between the handle and housing anyway, this damping unit does not contribute. This also ensures a good corner drilling capability, that is, the device can be brought up close to the corners with its drive axle and thus with the tool.
  • decoupling device and vibration absorber are located substantially in the drive axle, preferably symmetrical to the drive axle, so that the damping unit is mounted exactly where the vibrations are transmitted.
  • the damping unit is very effective.
  • the decoupler and the vibration absorber are preferably housed in a common damping unit, they are damped by independent spring systems.
  • the damping unit only increases the length of the machine, but is due to the immediate proximity to the percussion axis especially effective.
  • the damping unit is a structural unit that can be removed as needed by the power tool. As a result, on the one hand, it can be completely pre-assembled, which reduces the assembly costs, on the other hand, it can be retrofitted to older machines.
  • the figures show a power tool, in particular a hand-held hammer drill.
  • a drive assembly 11 is mounted for driving a tool holder 12.
  • a graphically not shown tool such as a chisel or a drill can be added, so that the power tool can be used as a chisel, drill or rotary hammer.
  • a damping unit explained in more detail below can also be used on other machine tools.
  • the drive assembly guides the tool along or about a drive axis aa, which according to Fig. 1 through the left side of the transition region between the main handle 13 and housing 10 leads.
  • the main handle 13 is arranged at the end remote from the tool holder 12 end of the power tool and is used to hold the machine tool in a basic position, for example, for mostly horizontal drilling.
  • the main handle 13 extends almost transversely to the drive axis aa.
  • another handle 27 is provided for driving the power tool on demand.
  • Fig. 1 the main handle 13 a drawing not shown or mounting option for attaching an auxiliary handle 23, wherein the arrangement of the auxiliary handle preferably transverse to the drive axis aa approximately in line with the main handle 13, as in Fig. 1 shown, takes place.
  • a so-called "compressor position" is possible, ie the power tool can in a representation as in Fig. 1 directed downwards so that one hand on the main handle 13 and the other hand on the auxiliary handle 23 leads the device.
  • the decoupling device can also be provided only on one side, then preferably approximately in the drive axle aa be if on the other side, for example, a rotary joint or other decoupling or even no decoupling is provided. Due to the arrangement of the auxiliary handle 23 on the main handle, in principle, the additional handle is decoupled from vibrations; Basically, because this does not have to apply to every position of the power tool, which will be discussed in more detail below.
  • Fig. 2 and 3 is in the same area, ie between main handle 13 and drive assembly 11 and housing 10 and a vibration damper 15 is provided.
  • the vibration damper 15 has at least one weight 16 and at least one elastic element, wherein a plurality of elastic elements 17,18 are provided in the embodiment.
  • the elastic element 17, 18 is arranged between the weight 16 and the housing 10 or main handle 13.
  • the at least one elastic element 17, 18 is connected at least on one side to the weight 16 for connection to the housing 10.
  • an elastic element as a pressure and tension element form, so for example as a compression and tension spring.
  • the figures each show an arrangement of the power tool in which the tool holder is directed downward.
  • Fig. 2 shows a arranged on the main handle 13 right vibration isolation 14 and a vibration decoupling also on the left side in the drive axle aa.
  • the attenuation unit 22 on the left side is significantly larger and in Fig. 3 shown enlarged.
  • the damping unit 22 comprises on the one hand approximately centrally the decoupling device 14 with the elastic elements 20 and 21.
  • the elastic elements are in a sleeve-shaped guide 25 and with its other end on the one hand on the housing 10 or a comparable element such as the bottom of the damping housing and on the other Main handle 13 stored.
  • the guide 25 serves to guide the weight 16 by receiving 16a for the elastic means, ie, helical springs 17 and 18 are provided.
  • the linear guide 24 is arranged for the main handle.
  • each spring is provided as elastic elements 20 and 21 as a decoupling device.
  • the elastic means 17 are mounted on the one hand in the receptacle 16a of the weight 16 and on the other hand supported on the housing.
  • the elastic means 18 are also mounted on the weight and in Fig. 3 mounted on top of a support plate 26.
  • Decoupling device 14 and vibration absorber 15 are therefore connected to the housing 10 and the main handle 13 via separate elastic elements 17, 18, 19; 20, 21. They are accommodated in a common damping unit 22, which is removable as a structural unit as needed by the power tool and thus can be retrofitted to older machines.
  • the damping unit can be pre-assembled, which reduces installation costs.
  • a further elastic element 19 is received in the damping unit and as part of the decoupling device 14, a further elastic element 19 is received.
  • This further elastic element 19 is used in particular, although the additional handle 23 according to Fig. 1 is attached to the power tool. Due to the arrangement of the decoupling device and also of the vibration damper between the main handle 13 and housing 10, the vibrations are also damped on the auxiliary handle 23, since this is arranged on the main handle 13. However, in the then preferably applied compressor position, ie when guided with two hands, applied by the user more pressure.
  • the at least one further elastic element 19 - in the embodiment, two springs are provided for - in operative engagement, while it is normally disengaged only on the main handle 13 alone at an operation.
  • This multi-stage arrangement of the decoupling ensures that in the compressor position relative to the normal position, ie guiding the device only on the main handle, a reinforced suspension is present, otherwise the elastic elements 20 and 21 of the first stage of the decoupling device 14 would be suppressed.
  • the decoupling devices 14 are arranged in or parallel to the drive shaft aa and guided on the linear guides 24 for the main handle 13.
  • the at least one further elastic element 19 is according to Fig. 3 arranged parallel to the drive shaft aa, but preferably offset in the direction of the auxiliary handle 23 to the drive shaft aa parallel offset, which also corresponds to the type of force application by the user.
  • the multi-stage decoupling device can be used in conjunction with an attachable to the main handle additional handle without a vibration absorber and then with the exception of the weight 15 and the elastic elements acting thereon 17, 18 have a construction comparable to the exemplary embodiment.

Abstract

The tool has a drive arrangement (11) arranged in a housing (10) and provided for driving a tool holder around a drive axis. A main handle (13) is arranged at an end turned away from the holder and extends transverse to the drive axis. A decoupling device (14) is provided for partial vibration- and oscillation decoupling of the handle from the drive arrangement. A retainer attaches an additional handle (23) to the main handle, where the additional handle is decoupled by the decoupling device. The decoupling device and a vibration damper are accommodated in a damping unit.

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft eine Elektrowerkzeugmaschine, insbesondere einen handgeführten Bohrhammer nach dem Oberbegriff des Anspruches 1.The invention relates to a power tool, in particular a hand-held hammer drill according to the preamble of claim 1.

Stand der TechnikState of the art

In der DE 102 36 135 A1 wird in einer Werkzeugaufnahme einer derartigen Elektrowerkzeugmaschine ein Werkzeug geführt, so dass das Gerät zum Beispiel als Bohr-, Meißel- oder Schlaghammer verwendet werden kann. Die Werkzeugmaschine bildet damit ein Schwingungssystem aus, das im Betrieb durch die Antriebsanordnung für das Werkzeug angeregt wird. Durch eine Entkopplung des Haupthandgriffs werden die an diesem auftretenden Vibrationen deutlich verringert. Die Entkopplungseinrichtung ist bei dieser Elektrowerkzeugmaschine zwischen Haupthandgriff und Gehäuse angeordnet. Eine Befestigungsmöglichkeit für einen Zusatzhandgriff ist vorgesehen, allerdings befindet sich diese Befestigungsmöglichkeit am Gehäuse der Maschine.In the DE 102 36 135 A1 a tool is guided in a tool holder of such a power tool, so that the device can be used, for example, as a drill, chisel or percussion hammer. The machine tool thus forms a vibration system which is excited during operation by the drive arrangement for the tool. By decoupling the main handle, the vibrations occurring at this are significantly reduced. The decoupling device is arranged in this power tool between main handle and housing. An attachment for an additional handle is provided, however, this attachment is located on the housing of the machine.

Eine andere Elektrowerkzeugmaschine mit einem Zusatzhandgriff ist aus der US 4 282 938 A bekannt. Eine Antriebseinheit treibt eine Antriebsachse an. Von einem Werkzeug, einer Sägekette, abgewandt ist ein sich quer zur Antriebsachse angeordneter Haupthandgriff vorgesehen, der durch eine Schwingungsentkopplung von der Antriebseinheit entkoppelt ist. Ferner ist der über die Entkopplungseinrichtung ebenfalls entkoppelter Zusatz- handgriff vorgesehen. Dadurch lässt sich der Komfort beim Halten des Gerätes verbessern, was wiederum ein längeres Arbeiten ohne Ermüdungserscheinungen des Bedieners ermöglicht.Another power tool with an additional handle is from the US 4 282 938 A known. A drive unit drives a drive axle. Facing away from a tool, a saw chain, a main handle arranged transversely to the drive axis is provided, which is decoupled from the drive unit by a vibration decoupling. Furthermore, the additional handle, which is also decoupled via the decoupling device, is provided. As a result, the comfort when holding the device can be improved, which in turn allows a longer work without fatigue of the operator.

Aus der DE 21 2005 000 027 U1 ist eine Elektrowerkzeugmaschine bekannt, bei der ein dynamischer Vibrationsreduzierer im Maschinengehäuse anordnet ist. Ein derartiger Schwingungstilger weist wenigstens ein Gewicht und wenigstens ein elastisches Element auf, wobei das elastische Element zwischen dem Gewicht und dem Gehäuse angeordnet ist und dazu dient, eine Vorspannkraft auf das Gewicht auszuüben. Das Gewicht bewegt sich bei Betätigung der Maschine entlang der Antriebsachse für das Werkzeug gegen die Vorspannkraft des elastischen Elements hin und her. Durch die Hin- und Herbewegung des Gewichts reduziert der dynamische Vibrationsreduzierer Vibrationen, die im Gehäuse in der Längsrichtung des Werkzeugs beim Arbeitsbetrieb erzeugt werden. Die DE 21 2005 000 027 U1 schlägt verschiedenste Anordnungen für einen derartigen Schwingungstilger vor, wie z.B. auch eine Anordnung im Übergangsbereich zwischen Haupthandgriff und Gehäuse.From the DE 21 2005 000 027 U1 a power tool is known in which a dynamic vibration reducer is arranged in the machine housing. Such a vibration absorber comprises at least a weight and at least one elastic element, wherein the elastic element is arranged between the weight and the housing and serves to exert a biasing force on the weight. The weight reciprocates against the biasing force of the elastic member upon actuation of the machine along the drive axis for the tool. By reciprocating the weight, the dynamic vibration reducer reduces vibrations in the housing in the longitudinal direction of the tool be generated during work. The DE 21 2005 000 027 U1 proposes various arrangements for such a vibration damper, such as, for example, an arrangement in the transition region between the main handle and the housing.

Neben diesen Schriften sind viele weitere Lösungen bekannt, die sich mit dem Thema Schwingungsentkopplung oder Schwingungstilgern beschäftigen. So ist aus der DE 10 2006 054 189 A1 eine Abkopplung des Schalterhandgriffs zum Maschinengehäuse über ein rheologisches Dämpfungsmittel bekannt. Eine Schwingungsentkopplung zwischen Schalterhandgriff und Maschinengehäuse mit Linearführung für den Handgriff zeigen EP 1 674 210 B1 , DE 101 30 088 A1 , DE 31 22 979 A1 und DE 10 2006 044 433 A1 . Bei der DE 10 2007 000 093 A1 erfolgt eine Abkopplung dadurch, dass ein Außengehäuse inklusive der Handgriffe vom Innengehäuse abgekoppelt ist. Diesen Schriften ist gemeinsam, dass sie über eine Entkopplungseinrichtung verfügen, jedoch nicht über einen Schwingungstilger.In addition to these writings, many other solutions are known that deal with the topic of vibration isolation or vibration absorbers. So is out of the DE 10 2006 054 189 A1 a decoupling of the switch handle to the machine housing via a rheological damping means known. A vibration decoupling between switch handle and machine housing with linear guide for the handle show EP 1 674 210 B1 . DE 101 30 088 A1 . DE 31 22 979 A1 and DE 10 2006 044 433 A1 , In the DE 10 2007 000 093 A1 a decoupling takes place in that an outer housing including the handles is decoupled from the inner housing. These writings have in common that they have a decoupling device, but not a vibration damper.

Lösungen mit einem Schwingungstilger finden sich in DE 878 737 B , EP 1 252 976 A1 oder EP 1 510 298 A1 parallel zur Antriebsanordnung, in der EP 1 832 394 A1 quer zur Antriebsanordnung, in der EP 1 952 950 A2 exzentrisch zur Schlagachse, was einen vergrößerten Bauraum erfordert, und in der WO 2008/140 030 A2 im Maschinengehäuse.Solutions with a vibration absorber can be found in DE 878 737 B . EP 1 252 976 A1 or EP 1 510 298 A1 parallel to the drive arrangement, in the EP 1 832 394 A1 transverse to the drive assembly, in the EP 1 952 950 A2 eccentric to the striking axis, which requires an enlarged space, and in the WO 2008/140 030 A2 in the machine housing.

Aufgabe der ErfindungObject of the invention

Ausgehend von diesem Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine Elektrowerkzeugmaschine derart weiterzubilden, dass eine zuverlässige Vibrations- und Schwingungsentkopplung auch bei Verwendung eines Zusatzhandgriffs und für diesen Zusatzhandgriff ermöglicht wird.Based on this prior art, the present invention has the object, a power tool in such a way that a reliable vibration and vibration decoupling is also possible when using an additional handle and for this additional handle.

Diese Aufgabe wird durch eine Elektrowerkzeugmaschine mit den Merkmalen des Anspruches 1 gelöst.This object is achieved by a power tool with the features of claim 1.

Dabei wird am Haupthandgriff eine Befestigungsmöglichkeit für einen Zusatzhandgriff vorgesehen, wodurch eine "Kompressor-Stellung" beim Betrieb der Werkzeugmaschine möglich wird, d.h. mit beiden Händen die Maschine im Bereich des Haupthandgriffs geführt werden kann. Dennoch erlaubt die Anordnung der Entkopplungseinrichtung unter dem Handgriff eine Entkopplung auch des Zusatzhandgriffs.In this case, a mounting option for an additional handle is provided on the main handle, creating a "compressor position" during operation of the machine tool is possible, ie with both hands the machine can be performed in the area of the main handle. Nevertheless, the arrangement of the decoupling device under the handle allows a decoupling of the auxiliary handle.

Da in dieser Stellung vom Benutzer mehr Kraft aufgebracht werden kann, ist die Entkopplungseinrichtung vorzugsweise mehrstufig auszubilden. Bei einer normalen Stellung, d.h. beim Führen der Maschine mit einer Hand und ggf. einer weiteren Hand am weiteren Handgriff nahe der Werkzeugaufnahme z.B. beim horizontalen Arbeiten wirkt nur eine erste Stufe der Federelemente, während in der Kompressorstellung, in der der Druck auf den Handgriff insgesamt größer ist, eine verstärkte Federung durch eine zweite Stufe von elastischen Elementen wirkt.Since more power can be applied by the user in this position, the decoupling device is preferably designed in multiple stages. In a normal position, i. when guiding the machine with one hand and possibly another hand on the further handle near the tool holder, e.g. when working horizontally only a first stage of the spring elements acts, while in the compressor position, in which the pressure on the handle is greater overall, a reinforced suspension acts through a second stage of elastic elements.

Sowohl die Entkopplungseinrichtung als auch ggf. ein Schwingungstilger sind vorzugsweise im Übergangsbereich zwischen Haupthandgriff und Antriebsanordnung bzw. Gehäuse angeordnet. Dadurch wird der Bereich, in dem das Gerät geführt wird, hinsichtlich Schwingungen und Vibrationen deutlich gedämpft, so dass ein längeres ermündungsfreies Betätigen möglich ist. Da Entkopplungseinrichtung und Schwingungstilger vorzugsweise als Dämpfungseinheit in einem Bereich angeordnet sind, der aus ergonomischen Gründen für die Betätigung der Maschine im Übergangsbereich zwischen Griff und Gehäuse ohnehin erforderlich ist, trägt diese Dämpfungseinheit nicht auf. Damit ist auch eine gute Eckenbohrfähigkeit sichergestellt, das heißt, das Gerät kann mit seiner Antriebsachse und damit mit dem Werkzeug bis dicht an die Ecken herangeführt werden.Both the decoupling device and optionally a vibration damper are preferably arranged in the transition region between the main handle and the drive arrangement or housing. As a result, the area in which the device is guided, significantly damped in terms of vibration and vibration, so that a longer tamper-free operation is possible. Since the decoupling device and vibration absorber are preferably arranged as a damping unit in a region which is required for ergonomic reasons for the operation of the machine in the transition region between the handle and housing anyway, this damping unit does not contribute. This also ensures a good corner drilling capability, that is, the device can be brought up close to the corners with its drive axle and thus with the tool.

Vorzugsweise befinden sich Entkopplungseinrichtung und Schwingungstilger im Wesentlichen in der Antriebsachse, vorzugsweise symmetrisch zur Antriebsachse, so dass die Dämpfungseinheit genau dort angebracht ist, wo die Vibrationen auch übertragen werden. Damit ist die Dämpfungseinheit sehr wirkungsvoll.Preferably decoupling device and vibration absorber are located substantially in the drive axle, preferably symmetrical to the drive axle, so that the damping unit is mounted exactly where the vibrations are transmitted. Thus, the damping unit is very effective.

Obwohl die Entkopplungseinrichtung und der Schwingungstilger vorzugsweise in einer gemeinsamen Dämpfungseinheit untergebracht sind, werden sie durch voneinander unabhängige Federsysteme gedämpft. Die Dämpfungseinheit erhöht lediglich das Längenmaß der Maschine, ist jedoch durch die unmittelbare Nähe zur Schlagwerkachse besonders wirkungsvoll. Vorzugsweise ist die Dämpfungseinheit eine bauliche Einheit, die bedarfsweise von der Elektrowerkzeugmaschine abgenommen werden kann. Dadurch kann sie einerseits komplett vormontiert werden, was die Montagekosten verringert, andererseits kann sie dadurch auch bei älteren Maschinen nachgerüstet werden.Although the decoupler and the vibration absorber are preferably housed in a common damping unit, they are damped by independent spring systems. The damping unit only increases the length of the machine, but is due to the immediate proximity to the percussion axis especially effective. Preferably, the damping unit is a structural unit that can be removed as needed by the power tool. As a result, on the one hand, it can be completely pre-assembled, which reduces the assembly costs, on the other hand, it can be retrofitted to older machines.

Weitere Vorteile ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispiels.Further advantages emerge from the dependent claims and the following description of a preferred embodiment.

Kurzbeschreibung der FigurenBrief description of the figures

Im Folgenden wird die Erfindung anhand eines in den Figuren dargestellten Ausführungsbeispieles näher erläutert. Es zeigen:

Fig. 1
eine Ansicht einer Elektrowerkzeugmaschine mit eingeschraubtem Zu- satzhangriff für eine "Kompressorstellung",
Fig. 2
eine vergrößerte, teilweise geschnittene Darstellung im Bereich des Haupthandgriffs,
Fig. 3
einen vergrößerten Ausschnitt aus Fig. 2 im Bereich der Dämpfungs- einheit.
In the following the invention will be explained in more detail with reference to an embodiment shown in FIGS. Show it:
Fig. 1
1 is a view of a power tool with a screwed-in additional attachment for a "compressor position",
Fig. 2
an enlarged, partially cut representation in the region of the main handle,
Fig. 3
an enlarged section Fig. 2 in the area of the damping unit.

Beschreibung bevorzugter AusführungsbeispieleDescription of preferred embodiments

Bevor die Erfindung im Detail beschrieben wird, ist darauf hinzuweisen, dass sie nicht auf die jeweiligen Bauteile der Vorrichtung sowie die jeweiligen Verfahrensschritte beschränkt ist, da diese Bauteile und Verfahren variieren können. Die hier verwendeten Begriffe sind lediglich dafür bestimmt, besondere Ausführungsformen zu beschreiben und werden nicht einschränkend verwendet. Wenn zudem in der Beschreibung oder in den Ansprüchen die Einzahl oder unbestimmte Artikel verwendet werden, bezieht sich dies auch auf die Mehrzahl dieser Elemente, solange nicht der Gesamtzusammenhang eindeutig etwas Anderes deutlich macht.Before describing the invention in detail, it should be noted that it is not limited to the respective components of the device and the respective method steps, since these components and methods may vary. The terms used herein are intended only to describe particular embodiments and are not intended to be limiting. In addition, if singular or indefinite articles are used in the specification or claims, this also applies to the majority of these elements unless the overall context clearly makes otherwise clear.

Die Figuren zeigen eine Elektrowerkzeugmaschine, insbesondere einen handgeführten Bohrhammer. In einem Gehäuse 10 ist eine Antriebsanordnung 11 zum Antrieb einer Werkzeugaufnahme 12 angebracht. In der Werkzeugaufnahme kann ein zeichnerisch nicht dargestelltes Werkzeug wie ein Meißel oder ein Bohrer aufgenommen werden, so dass die Elektrowerkzeugmaschine als Meißel-, Bohr- oder Drehbohrhammer eingesetzt werden kann. Grundsätzlich kann eine im Folgenden noch näher erläuterte Dämpfungseinheit jedoch auch an anderen Werkzeugmaschinen verwendet werden. Die Antriebsanordnung führt das Werkzeug entlang oder um eine Antriebsachse a-a, die gemäß Fig. 1 durch die linke Seite des Übergangsbereichs zwischen Haupthandgriff 13 und Gehäuse 10 führt. Der Haupthandgriff 13 ist an dem von der Werkzeugaufnahme 12 abgewandten Ende der Elektrowerkzeugmaschine angeordnet und dient zum Halten der Werkzeugmaschine in einer Grundstellung z.B. zum meist horizontalen Bohren. Der Haupthandgriff 13 erstreckt sich nahezu quer zur Antriebsachse a-a. Im Bereich der Werkzeugaufnahme ist ein weiterer Handgriff 27 zum bedarfsweisen Führen der Elektrowerkzeugmaschine vorgesehen.The figures show a power tool, in particular a hand-held hammer drill. In a housing 10, a drive assembly 11 is mounted for driving a tool holder 12. In the tool holder, a graphically not shown tool such as a chisel or a drill can be added, so that the power tool can be used as a chisel, drill or rotary hammer. In principle, however, a damping unit explained in more detail below can also be used on other machine tools. The drive assembly guides the tool along or about a drive axis aa, which according to Fig. 1 through the left side of the transition region between the main handle 13 and housing 10 leads. The main handle 13 is arranged at the end remote from the tool holder 12 end of the power tool and is used to hold the machine tool in a basic position, for example, for mostly horizontal drilling. The main handle 13 extends almost transversely to the drive axis aa. In the area of the tool holder, another handle 27 is provided for driving the power tool on demand.

Gemäß Fig. 1 weist der Haupthandgriff 13 eine zeichnerisch nicht dargestellte Aufnahme bzw. Befestigungsmöglichkeit zur Anbringung eines Zusatzhandgriffs 23 auf, wobei die Anordnung des Zusatzhandgriffs vorzugsweise quer zu Antriebsachse a-a etwa in Linie mit dem Haupthandgriff 13, wie in Fig. 1 dargestellt, erfolgt. Mit diesem Zusatzhandgriff ist eine sogenannte "Kompressorstellung" möglich, d.h. die Elektrowerkzeugmaschine kann in einer Darstellung wie in Fig. 1 nach unten gerichtet so geführt werden, das eine Hand am Haupthandgriff 13 und die andere Hand am Zusatzhandgriff 23 das Gerät führt.According to Fig. 1 the main handle 13 a drawing not shown or mounting option for attaching an auxiliary handle 23, wherein the arrangement of the auxiliary handle preferably transverse to the drive axis aa approximately in line with the main handle 13, as in Fig. 1 shown, takes place. With this additional handle, a so-called "compressor position" is possible, ie the power tool can in a representation as in Fig. 1 directed downwards so that one hand on the main handle 13 and the other hand on the auxiliary handle 23 leads the device.

Eine Entkopplungseinrichtung 14, die vor allem in den Figuren 2 und 3 in den Übergangsbereichen zwischen Haupthandgriff 13 und Gehäuse 10 in Fig. 1 links und rechts zu erkennen ist, ist vorgesehen, um zumindest teilweise die Schwingungen der Antriebsanordnung vom Haupthandgriff 13 zu entkoppeln. Aus diesem Grund ist sie zwischen dem Gehäuse, in dem die Antriebsanordnung 11 vorgesehen ist, und dem Haupthandgriff 13 angeordnet. Grundsätzlich kann die Entkopplungseinrichtung auch nur auf einer Seite, dann vorzugsweise in etwa in der Antriebsachse a-a vorgesehen sein, wenn auf der anderen Seite z.B. ein Drehgelenk oder eine andere Entkopplung oder auch gar keine Entkopplung vorgesehen ist. Durch die Anordnung des Zusatzhandgriffs 23 am Haupthandgriff ist grundsätzlich auch der Zusatzhandgriff von Schwingungen entkoppelt; grundsätzlich, weil dies nicht für jede Stellung der Elektrowerkzeugmaschine gelten muss, auf was unten noch näher eingegangen wird.A decoupling device 14, especially in the Figures 2 and 3 in the transition areas between the main handle 13 and housing 10 in Fig. 1 can be seen left and right, is provided to at least partially decouple the vibrations of the drive assembly from the main handle 13. For this reason, it is arranged between the housing in which the drive assembly 11 is provided, and the main handle 13. In principle, the decoupling device can also be provided only on one side, then preferably approximately in the drive axle aa be if on the other side, for example, a rotary joint or other decoupling or even no decoupling is provided. Due to the arrangement of the auxiliary handle 23 on the main handle, in principle, the additional handle is decoupled from vibrations; Basically, because this does not have to apply to every position of the power tool, which will be discussed in more detail below.

Gemäß Fig. 2 und 3 ist im selben Bereich, d.h. zwischen Haupthandgriff 13 und Antriebsanordnung 11 bzw. Gehäuse 10 auch ein Schwingungstilger 15 vorgesehen. Der Schwingungstilger 15 weist wenigstens ein Gewicht 16 und wenigstens ein elastisches Element auf, wobei im Ausführungsbeispiel mehrere elastische Elemente 17,18 vorgesehen sind. Das elastische Element 17,18 ist dabei zwischen Gewicht 16 und Gehäuse 10 bzw. Haupthandgriff 13 angeordnet. Allgemein gesagt, steht das wenigstens ein elastisches Element 17,18 zumindest einseitig mit dem Gewicht 16 zur Verbindung mit dem Gehäuse 10 in Verbindung steht. Denkbar ist z.B. ein elastisches Element als Druck- und Zugelement auszubilden, also z.B. als Druck- und Zugfeder.According to Fig. 2 and 3 is in the same area, ie between main handle 13 and drive assembly 11 and housing 10 and a vibration damper 15 is provided. The vibration damper 15 has at least one weight 16 and at least one elastic element, wherein a plurality of elastic elements 17,18 are provided in the embodiment. The elastic element 17, 18 is arranged between the weight 16 and the housing 10 or main handle 13. Generally speaking, the at least one elastic element 17, 18 is connected at least on one side to the weight 16 for connection to the housing 10. It is conceivable, for example, an elastic element as a pressure and tension element form, so for example as a compression and tension spring.

Die Figuren zeigen jeweils eine Anordnung der Elektrowerkzeugmaschine, bei der die Werkzeugaufnahme nach unten gerichtet ist. Fig. 2 zeigt eine am Haupthandgriff 13 rechts angeordnete Schwingungsentkopplung 14 und eine Schwingungsentkopplung auch auf der linken Seite in der Antriebsachse a-a. Die Dämpfungseinheit 22 auf der linken Seite ist jedoch deutlich umfangreicher und in Fig. 3 vergrößert dargestellt. Die Dämpfungseinheit 22 umfasst einerseits etwa mittig die Entkopplungseinrichtung 14 mit den elastischen Elementen 20 und 21. Die elastischen Elemente sind dabei in einer hülsenförmigen Führung 25 und mit ihrem anderen Ende einerseits am Gehäuse 10 oder einem vergleichbaren Element wie z.B. dem Boden des Dämpfungsgehäuses und andererseits am Haupthandgriff 13 gelagert. Die Führung 25 dient zur Führung des Gewichts 16, indem Aufnahmen 16a für die elastischen Mittel, d.h. Schraubenfedern 17 und 18 vorgesehen sind. In der Führung 25 ist die Linearführung 24 für den Haupthandgriff angeordnet.The figures each show an arrangement of the power tool in which the tool holder is directed downward. Fig. 2 shows a arranged on the main handle 13 right vibration isolation 14 and a vibration decoupling also on the left side in the drive axle aa. The attenuation unit 22 on the left side, however, is significantly larger and in Fig. 3 shown enlarged. The damping unit 22 comprises on the one hand approximately centrally the decoupling device 14 with the elastic elements 20 and 21. The elastic elements are in a sleeve-shaped guide 25 and with its other end on the one hand on the housing 10 or a comparable element such as the bottom of the damping housing and on the other Main handle 13 stored. The guide 25 serves to guide the weight 16 by receiving 16a for the elastic means, ie, helical springs 17 and 18 are provided. In the guide 25, the linear guide 24 is arranged for the main handle.

Im Ausführungsbeispiel sind als Entkopplungseinrichtung 14 vier Federn als elastische Elemente 20 und 21 vorgesehen. Als elastische Mittel für den Schwingungstilger und damit für das Gewicht 16 sind jeweils vier elastische Elemente 17 und vier elastische Elemente 18 vorhanden. Eine andere Anzahl von Federn bzw. elastischen Mitteln ist möglich. Die elastischen Mittel 17 sind einerseits in der Aufnahme 16a des Gewichts 16 gelagert und andererseits am Gehäuse abgestützt. Die elastischen Mittel 18 sind ebenfalls am Gewicht gelagert und in Fig. 3 oben an einer Abstützplatte 26 gelagert. Entkopplungseinrichtung 14 und Schwingungstilger 15 sind also über gesonderte elastische Elemente 17,18,19;20,21 mit dem Gehäuse 10 und dem Haupthandgriff 13 verbunden. Sie sind in einer gemeinsamen Dämpfungseinheit 22 aufgenommen, die als bauliche Einheit bedarfsweise von der Elektrowerkzeugmaschine abnehmbar ist und damit auch an älteren Maschinen nachrüstbar ist. Zudem kann die Dämpfungseinheit vormontiert werden, was die Montagekosten verringert.In the exemplary embodiment 14 four springs are provided as elastic elements 20 and 21 as a decoupling device. As elastic means for the vibration damper and thus for the weight 16 four elastic elements 17 and four elastic elements 18 are present. Another number of springs or elastic means is possible. The elastic means 17 are mounted on the one hand in the receptacle 16a of the weight 16 and on the other hand supported on the housing. The elastic means 18 are also mounted on the weight and in Fig. 3 mounted on top of a support plate 26. Decoupling device 14 and vibration absorber 15 are therefore connected to the housing 10 and the main handle 13 via separate elastic elements 17, 18, 19; 20, 21. They are accommodated in a common damping unit 22, which is removable as a structural unit as needed by the power tool and thus can be retrofitted to older machines. In addition, the damping unit can be pre-assembled, which reduces installation costs.

In der Dämpfungseinheit und als Teil der Entkopplungseinrichtung 14 ist ein weiteres elastisches Element 19 aufgenommen. Dieses weitere elastische Element 19 kommt insbesondere dann zum Einsatz, wenn auch der Zusatzhandgriff 23 gemäß Fig. 1 an der Elektrowerkzeugmaschine angebracht wird. Durch die Anordnung der Entkopplungseinrichtung und auch des Schwingungstilgers zwischen Haupthandgriff 13 und Gehäuse 10 werden die Vibrationen auch am Zusatzhandgriff 23 gedämpft, da dieser am Haupthandgriff 13 angeordnet ist. Allerdings wird in der dann bevorzugt angewandten Kompressorstellung, d.h. beim Führen mit zwei Händen, vom Benutzer mehr Druck aufgebracht. In dieser Stellung, d.h. bei einer Betätigung über Haupthandgriff 13 und Zusatzhandgriff 23 kommt das wenigstens eine weitere elastische Element 19 - im Ausführungsbeispiel werden zwei Federn dafür vorgesehen - in Wirkeingriff, während es bei einer Betätigung nur über den Haupthandgriff 13 allein normalerweise außer Eingriff ist. Diese mehrstufige Anordnung der Entkopplungseinrichtung sorgt dafür, dass in der Kompressorstellung gegenüber der Normalstellung, d.h. Führen des Geräts nur am Haupthandgriff, eine verstärkte Federung vorhanden ist, da ansonsten die elastischen Elemente 20 und 21 der ersten Stufe der Entkopplungseinrichtung 14 überdrückt würden.In the damping unit and as part of the decoupling device 14, a further elastic element 19 is received. This further elastic element 19 is used in particular, although the additional handle 23 according to Fig. 1 is attached to the power tool. Due to the arrangement of the decoupling device and also of the vibration damper between the main handle 13 and housing 10, the vibrations are also damped on the auxiliary handle 23, since this is arranged on the main handle 13. However, in the then preferably applied compressor position, ie when guided with two hands, applied by the user more pressure. In this position, ie when actuated by the main handle 13 and auxiliary handle 23, the at least one further elastic element 19 - in the embodiment, two springs are provided for - in operative engagement, while it is normally disengaged only on the main handle 13 alone at an operation. This multi-stage arrangement of the decoupling ensures that in the compressor position relative to the normal position, ie guiding the device only on the main handle, a reinforced suspension is present, otherwise the elastic elements 20 and 21 of the first stage of the decoupling device 14 would be suppressed.

Die Entkopplungseinrichtungen 14 sind in bzw. parallel zur Antriebsachse a-a angeordnet und an den Linearführungen 24 für den Haupthandgriff 13 geführt. Das wenigstens eine weitere elastische Element 19 ist gemäß Fig. 3 parallel zur Antriebsachse a-a angeordnet, allerdings vorzugsweise in Richtung auf den Zusatzhandgriff 23 zur Antriebsachse a-a parallel versetzt angeordnet, was auch der Art der Krafteinleitung durch den Benutzer entspricht.The decoupling devices 14 are arranged in or parallel to the drive shaft aa and guided on the linear guides 24 for the main handle 13. The at least one further elastic element 19 is according to Fig. 3 arranged parallel to the drive shaft aa, but preferably offset in the direction of the auxiliary handle 23 to the drive shaft aa parallel offset, which also corresponds to the type of force application by the user.

Die mehrstufige Entkopplungseinrichtung kann in Verbindung mit einem am Haupthandgriff befestigbaren Zusatzhandgriff allerdings auch ohne einen Schwingungstilger eingesetzt werden und kann dann mit Ausnahme des Gewichts 15 und den daran angreifenden elastischen Elementen 17, 18 einen zum Ausführungsbeispiel vergleichbaren Aufbau aufweisen.However, the multi-stage decoupling device can be used in conjunction with an attachable to the main handle additional handle without a vibration absorber and then with the exception of the weight 15 and the elastic elements acting thereon 17, 18 have a construction comparable to the exemplary embodiment.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Gehäusecasing
1111
Antriebsanordnungdrive arrangement
1212
Werkzeugaufnahmetool holder
1313
HaupthandgriffMain handle
1414
Entkopplungseinrichtungdecoupling device
1515
Schwingungstilgervibration absorber
1616
GewichtWeight
16a16a
Aufnahmeadmission
17,1817.18
elastisches Element für 15elastic element for 15
1919
weiteres elastisches Elementanother elastic element
20,2120.21
elastisches Element für 14elastic element for 14
2222
Dämpfungseinheitdamping unit
2323
ZusatzhandgriffAdditional handle
2424
Linearführunglinear guide
2525
Führung für 16Guided tour for 16
2626
Abstützplattesupport plate
2727
Handgriffhandle
a - aa - a
Antriebsachsedrive axle

Claims (8)

  1. An electric tool machine, in particular a handheld hammer drill, having
    - a driving arrangement (11) accommodated in a housing (10) for driving a tool holder (12) along or about a drive axis (a-a),
    - a main handle (13) arranged at an end facing away from the tool holder (12) for gripping the tool machine and extending square to the drive axis (a-a),
    - a decoupling device (14) for the at least partial vibration decoupling of the main handle (13) from the driving arrangement (11),
    characterised in that a receptacle for attaching an additional handle (23) is provided on the main handle (13), that the additional handle is also decoupled by the decoupling device (14) and that, when in its position of use, the additional handle (23) is arranged square to the drive axis (a-a) roughly in line with the main handle (13).
  2. An electric tool machine according to Claim 1, characterised in that the decoupling device (14) is multistage and exhibits a plurality of elastic elements (19,20,21).
  3. An electric tool machine according to Claim 1 or 2, characterised in that at least one further elastic element (19) comes into working engagement when main handle (13) and additional handle (23) are operated at the same time.
  4. An electric tool machine according to Claim 3, characterised in that during operation by means of the main handle (13) and if necessary of the additional handle (17) the at least one further elastic element (19) is basically disengaged.
  5. An electric tool machine according to Claim 3 or 4, characterised in that the at least one further elastic element (19) is arranged parallel to the drive axis (a-a) and offset from the drive axis (a-a) toward the additional handle (23).
  6. An electric tool machine according to any one of the preceding claims, characterised in that a vibration damper (15) having at least one weight (16) and at least one elastic element (17,18) is provided, with at least one elastic element (17,18) connecting the weight (16) to the housing (10) at least at one end, and in that the vibration damper (15) is also arranged between main handle (13) and driving arrangement (11).
  7. An electric tool machine according to Claim 6, characterised in that the decoupling device (14) and the vibration damper (15) are accommodated in a common damping unit (22).
  8. An electric tool machine according to Claim 7, characterised in that the damping unit (22) constitutes a structural unit that can be detached from the electric tool machine as required.
EP10005204A 2009-05-20 2010-05-19 Electric tool machine, in particular handheld hammer drill Active EP2253430B1 (en)

Applications Claiming Priority (1)

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DE102009022088A DE102009022088A1 (en) 2009-05-20 2009-05-20 Electric power tool, in particular hand-operated hammer drill

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EP2253430A1 EP2253430A1 (en) 2010-11-24
EP2253430B1 true EP2253430B1 (en) 2011-11-02

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DE102009022088A1 (en) 2010-11-25
EP2253430A1 (en) 2010-11-24
ATE531486T1 (en) 2011-11-15

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