EP2089191B1 - Hand machine tool with a vibration damped rounded handle - Google Patents

Hand machine tool with a vibration damped rounded handle Download PDF

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Publication number
EP2089191B1
EP2089191B1 EP07820408A EP07820408A EP2089191B1 EP 2089191 B1 EP2089191 B1 EP 2089191B1 EP 07820408 A EP07820408 A EP 07820408A EP 07820408 A EP07820408 A EP 07820408A EP 2089191 B1 EP2089191 B1 EP 2089191B1
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EP
European Patent Office
Prior art keywords
power tool
portable power
housing
coupling elements
handle
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Not-in-force
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EP07820408A
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German (de)
French (fr)
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EP2089191A1 (en
Inventor
Hubert Steinke
Gerhard Meixner
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2089191A1 publication Critical patent/EP2089191A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/04—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
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/371—Use of springs

Definitions

  • the present invention relates to a hand tool, in particular a drill and / or percussion hammer, with a housing and a vibration-damped, with respect to the housing movable and resiliently supported U-shaped bow handle according to the preamble of claim 1.
  • a hand tool machine which has a vibration-damped, with respect to the housing resiliently supported bow handle.
  • This handle has two substantially parallel leg portions, which are guided linearly movable in complementary recesses of a handle end of the housing in the working direction of the machine tool.
  • the two leg parts are each connected via coupling members to the housing.
  • the outer ends of the coupling links are articulated to the respective leg portion, while their inner ends are pivotally connected within the housing with this. Since there is no direct connection between the handle and the vibrating housing, a good decoupling of the handle is achieved.
  • a hand tool with a vibration-damped handle in which one of two hingedly connected to the handle and the housing coupling members is placed in a space-saving manner inside the hollow handle, while the other is located inside the housing.
  • the present invention seeks to improve a hand tool of the type mentioned above in such a way that the number of different components required for vibration decoupling of the handle can be reduced.
  • both coupling members can be formed identical and applied to the strap handle pressure force by means of a single compression spring uniformly in both coupling elements and are introduced synchronously into the housing of the machine tool.
  • a preferred embodiment of the invention provides that the point of intersection of the two coupling members is arranged in a longitudinal center plane of the power tool and that between the crossing point and the bow handle, preferably between the crossing point and a remote from the housing of the power tool rear bounding wall of the yoke portion of the strap handle, a single compression spring is used, with the at least part of the pressure applied to the strap handle pressure force can be symmetrically introduced to the longitudinal center plane in the coupling elements.
  • the length of a lever arm of each coupling member can be adjusted, which extends from a pivot point at the pivot point to a swivel joint located on the projection. This in turn makes it possible to adjust the spring travel of the spring during the movement of the strap handle from the rear to the front end position of the spring characteristic existing springs.
  • the two coupling members are suitably straight-line coupling rods have the same shapes and dimensions.
  • Hand tool 2 shown schematically in the form of a hammer drill or a percussion hammer consists essentially of a Housing 4, a tool holder 6 for receiving a tool 8, and a drive means (not shown) enclosed by the housing 4 for rotating and beating driving the tool 8 inserted into the tool holder 6.
  • the drive device consists in a known manner of an electric drive motor which rotatably drives the tool holder 6 via a reduction or manual transmission, and a likewise driven by the drive motor percussion, with which the tool 8 in the tool holder 6 with a working direction A of the machine tool. 2 acting impact force can be applied.
  • the housing 4 is provided at its rear end remote from the tool holder 6 with a strap handle 10 which serves together with a near the tool holder 6 at 12 releasably attached to the housing 4 auxiliary handle 14 for gripping and holding the machine tool 2.
  • the over the housing 4 protruding strap handle 10 encloses together with the housing 4 a handle opening 16 for a hand of an operator and facilitates particularly in vertical operation, that is in the vertical direction A and downwardly directed tool 8, the holding and guiding the machine tool 2, while the auxiliary handle 14 is preferably used in horizontally oriented or flat inclined working direction A used.
  • the housing 4 has two parallel, rearwardly beyond the rear end face 18 of the housing 4 protruding extensions 20, 22 which are rigidly connected to the housing 4 and project into the hollow interior of the strap handle 10.
  • the hanger handle 10 consists essentially of a direction perpendicular to the working direction A of the power tool 2 hollow yoke 24, which is taken for use of the power tool 2 by the user with one hand, and two parallel to the working direction A of the power tool 2 hollow leg portions 26, 28, the her to the housing 4 adjacent Front ends are open, so that the extensions 20, 22 of the housing 4 can dip into the leg portions 26, 28.
  • the two extensions 20 dip , 22 of the housing 4 with large lateral play S in the hollow leg portions 26, 28 of the strap handle 10 a.
  • the hanger handle 10 is not supported directly on the extensions 20, 22 or on the housing 4, but via a helical compression spring 30, which provides for a vibration isolation between the hanger handle 10 and the housing 4.
  • the two straight, elongated coupling rods 34, 36 are housed in the hollow interior of the yoke part 24 of the strap handle 10, wherein they are generally aligned transversely to the working direction A and the longitudinal center plane 32 of the power tool 2.
  • the outer, that is arranged at a greater distance from the longitudinal center plane 32 front end of each coupling rod 34, 36 is articulated via a pivot joint 38 and 40 at the free end of an adjacent extension 20 and 22, while the opposite inner, ie at a smaller distance from the longitudinal center plane 32 arranged front end of each coupling rod 34, 36 is articulated via a further pivot joint 42 and 44 on a projection 46 and 48, on the side facing the pivot joint 38 and 40 side of the longitudinal center plane 32 via a housing 4 facing the front Boundary wall 50 of the yoke part 24 protrudes into the interior thereof, so that the two coupling rods 34, 36 intersect.
  • the coupling rods 34, 36 are pivotally connected to each other at their crossing point via a fifth pivot 52.
  • the pivot axis of the pivot joint 52 is aligned parallel to the pivot axes of the other pivot joints 38, 40, 42, 44 and lies in the longitudinal center plane 32 of the power tool 2.
  • the two coupling rods 34, 36 are supported at their intersection point or on the pivot joint 52 via the helical compression spring 30 against a remote from the housing 4 rear boundary wall 54 of the yoke member 24, so that a force applied to the hanger handle 10 pressing force F at least partially via the helical compression spring 30 is introduced into the coupling rods 34, 36 and via these in the extensions 20, 22 of the housing 4.
  • the helical compression spring 30 is increasingly compressed with increasing pressure force F, but with their spring travel, that is, the length difference of the spring 30 between its slightly compressed state in the rear end position of the hanger handle 10 ( Fig. 2 ) and their more compressed state in the front end position ( Fig. 3 ) of the hanger handle 10, is smaller than the path of movement of the hanger handle 10, as a result of the different length lever arms of the coupling rods 34, 36 on both sides of the pivot joint 52 of the crossing point of the coupling rods 34, 36 in the movement of the hanger handle 10 from the rear end position in the front End position slightly moved, but less far than the strap handle 10 itself.
  • the front end position of the hanger handle 10 is limited by the spring force of the compressed helical compression spring 30, which counteracts the movement and is dimensioned accordingly.
  • the rear end position of the hanger handle 10 is defined by striking the two coupling rods 34, 36 against the inside of the front boundary wall 50 of the yoke member 24 laterally adjacent to the projections 46, 48, whereby the movement path of the hanger handle 10 is limited away from the housing 4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

The invention relates to a hand machine tool (2), particularly a percussion drill and/or percussion hammer, comprising a housing (4) having two parallel appendages (20, 22), a hollow, U-shaped, rounded handle (10) with a yoke (24) and two parallel legs (26, 28), said handle being movably supported on springs in relation to the housing (4) for the purpose of damping vibration. The appendages (20, 22) of the housing (4) extend into both hollow legs (26, 28) of the rounded handle (10). The invention also comprises two coupling elements (34, 36) situated in the hollow yoke (24) of the rounded handle (10) which serve to synchronize the movements of both legs (26, 28). The external end faces of the coupling elements (34, 36) are flexibly connected to the appendages (20, 22). The coupling elements (34, 36) are connected on the other end faces thereof to the rounded handle (10), and cross each other, and are flexibly connected to each other at the crossing point.

Description

Die vorliegende Erfindung betrifft eine Handwerkzeugmaschine, insbesondere einen Bohr- und/oder Schlaghammer, mit einem Gehäuse und einem vibrationsgedämpften, in Bezug zum Gehäuse beweglichen und federnd abgestützten U-förmigen Bügelhandgriff gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a hand tool, in particular a drill and / or percussion hammer, with a housing and a vibration-damped, with respect to the housing movable and resiliently supported U-shaped bow handle according to the preamble of claim 1.

Stand der TechnikState of the art

Insbesondere bei Handwerkzeugmaschinen mit einem schlagenden Antrieb, wie zum Beispiel bei Bohrhämmern, Meißelhämmern und dergleichen, kann die Handwerkzeugmaschine beträchtlichen Vibrationen ausgesetzt sein. Wenn diese Vibrationen auf einen zum Anpressen der Handwerkzeugmaschine gegen ein Werkstück dienenden Handgriff übertragen werden, wird dies vom Bediener nicht nur als unangenehm empfunden, sondern kann bei längerer Exposition auch Gesundheitsschäden zur Folgen haben. Daher werden zur linearen Vibrationsdämpfung von Bohrhämmern bisher zumeist Doppelschalengehäuse verwendet, bei denen der gesamte Hammer in seiner Arbeitsrichtung federnd in einer äußeren Schale aufgehängt ist. Diese Konstruktion ist jedoch verhältnismäßig aufwändig und daher auch teuer.In particular, in portable power tools with a beating drive, such as drill hammers, chippers and the like, the power tool can be exposed to considerable vibration. If these vibrations are transmitted to a handle used to press the hand tool against a workpiece, this is not only perceived as unpleasant by the operator, but may also result in health damage on prolonged exposure. Therefore, for the linear vibration damping of rotary hammers so far mostly double shell housing used in which the entire hammer is suspended in its working direction resiliently in an outer shell. However, this construction is relatively expensive and therefore expensive.

Aus der WO 03/011532 A1 ist bereits eine Handwerkzeugmaschine bekannt, die einen vibrationsgedämpften, in Bezug zum Gehäuse federnd abgestützten Bügelhandgriff aufweist. Dieser Handgriff besitzt zwei im Wesentlichen parallele Schenkelteile, die in komplementären Ausnehmungen eines Griffendes des Gehäuses in Arbeitsrichtung der Werkzeugmaschine linear beweglich geführt sind. Um zu gewährleisten, dass sich die beiden Schenkelteile nicht in den Ausnehmungen verkanten und sich selbst dann synchron zueinander in Bezug zum Gehäuse bewegen, wenn vom Bediener eine einseitige oder nicht parallel zur Arbeitsrichtung der Werkzeugmaschine ausgerichtete Andruckkraft auf den Handgriff aufgebracht wird, sind die beiden Schenkelteile jeweils über Koppelglieder mit dem Gehäuse verbunden. Dabei sind die äußeren Stirnenden der Koppelglieder an dem jeweiligen Schenkelteil angelenkt, während ihre inneren Stirnenden innerhalb des Gehäuses gelenkig mit diesem verbunden sind. Da es keine direkte Verbindung zwischen dem Handgriff und dem vibrierenden Gehäuse gibt, wird eine gute Entkopplung des Handgriffs erreicht.From the WO 03/011532 A1 A hand tool machine is already known which has a vibration-damped, with respect to the housing resiliently supported bow handle. This handle has two substantially parallel leg portions, which are guided linearly movable in complementary recesses of a handle end of the housing in the working direction of the machine tool. To ensure that the two leg portions do not tilt in the recesses and move synchronously with each other in relation to the housing even when the operator is unilateral or not parallel directed to the working direction of the machine tool pressure force is applied to the handle, the two leg parts are each connected via coupling members to the housing. In this case, the outer ends of the coupling links are articulated to the respective leg portion, while their inner ends are pivotally connected within the housing with this. Since there is no direct connection between the handle and the vibrating housing, a good decoupling of the handle is achieved.

Weiter ist es auch aus der DE 10 2004 019 776 A1 bereits bekannt, zur Schwingungsdämpfung die beiden Schenkelteile eines U-förmigen Bügelhandgriffs einer Handwerkzeugmaschine über Koppelglieder gelenkig mit dem Gehäuse der Werkzeugmaschine zu verbinden.Next it is also from the DE 10 2004 019 776 A1 already known, for vibration damping to connect the two leg parts of a U-shaped bow handle of a hand tool via coupling links articulated to the housing of the machine tool.

Außerdem ist aus der DE 101 38 123 A1 eine Handwerkzeugmaschine mit einem vibrationsgedämpften Handgriff bekannt, bei der eines von zwei gelenkig mit dem Handgriff und dem Gehäuse verbundenen Koppelgliedern platzsparend im Inneren des hohlen Handgriffs untergebracht ist, während sich das andere im Inneren des Gehäuses befindet.Moreover, from the DE 101 38 123 A1 a hand tool with a vibration-damped handle, in which one of two hingedly connected to the handle and the housing coupling members is placed in a space-saving manner inside the hollow handle, while the other is located inside the housing.

Darüber hinaus ist in der WO 2008/052832 A1 der Anmelderin, die als nächstliegender Stand der Technik anzusehen ist aber unter Artikel 54(3) EPÜ fällt, bereits eine Handwerkzeugmaschine der eingangs genannten Art dargestellt, bei der sich beide Koppelglieder im Inneren eines hohlen Bügelhandgriffs befinden. Die beiden Koppelglieder werden dort von zweiarmigen Hebeln gebildet, die zwischen ihren Stirnenden jeweils an dem Bügelhandgriff angelenkt sind. Die voneinander abgewandten äußeren Stirnenden der beiden Koppelglieder sind dort an den freien Enden zweier paralleler Gehäusefortsätze angelenkt, die durch die hohlen Schenkelteile des Bügelhandgriffs bis in dessen Jochteil ragen, in dessen Mitte die einander zugewandten Stirnenden der Hebelame gelenkig ineinander greifen. Die beiden Hebelarme stützen sich über eine Druckfeder gegen eine zum Gehäuse benachbarte vordere Begrenzungswand des Jochteils ab. Als nachteilig wird zum einen die unterschiedliche Form der Koppelglieder empfunden, wodurch die Anzahl der Komponenten und damit der Lagerhaltungs- und Montageaufwand vergrößert wird.In addition, in the WO 2008/052832 A1 The Applicant, which is to be regarded as the closest prior art but falls under Article 54 (3) EPC, already shown a hand tool of the type mentioned, in which both coupling members are inside a hollow bow handle. The two coupling links are formed there by two-armed levers which are articulated between their front ends in each case on the strap handle. The facing away from each other outer ends of the two coupling links are articulated there at the free ends of two parallel Gehäusefortsätze, which protrude through the hollow leg portions of the strap handle into the yoke, in the middle of the mutually facing ends of the lever handle articulated mesh. The two lever arms are supported by a compression spring against an adjacent to the housing front boundary wall of the yoke part. A disadvantage is felt on the one hand, the different shape of the coupling elements, whereby the number of components and thus the storage costs and assembly costs is increased.

Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, eine Handwerkzeugmaschine der zuvor genannten Art dahingehend zu verbessern, dass die Anzahl der unterschiedlichen zur Schwingungsentkopplung des Handgriffs benötigten Komponenten verringert werden kann.Based on this, the present invention seeks to improve a hand tool of the type mentioned above in such a way that the number of different components required for vibration decoupling of the handle can be reduced.

Offenbarung der ErfindungDisclosure of the invention

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Koppelglieder mit ihren anderen Stirnenden am Bügelhandgriff angelenkt sind, sich kreuzen und am Kreuzungspunkt gelenkig miteinander verbunden sind.This object is achieved in that the coupling links are articulated with their other ends on the strap handle, intersect and are hinged together at the intersection.

Mit dieser Merkmalskombination können beide Koppelglieder identisch ausgebildet und eine auf den Bügelhandgriff aufgebrachte Andruckkraft mittels einer einzigen Druckfeder gleichmäßig in beide Koppelglieder und von diesen synchron in das Gehäuse der Werkzeugmaschine eingeleitet werden.With this combination of features, both coupling members can be formed identical and applied to the strap handle pressure force by means of a single compression spring uniformly in both coupling elements and are introduced synchronously into the housing of the machine tool.

Eine bevorzugte Ausgestaltung der Erfindung sieht dazu vor, dass der Kreuzungspunkt der beiden Koppelglieder in einer Längsmittelebene der Handwerkzeugmaschine angeordnet ist und dass zwischen den Kreuzungspunkt und den Bügelhandgriff, vorzugsweise zwischen den Kreuzungspunkt und eine vom Gehäuse der Handwerkzeugmaschine abgewandte hintere Begrenzungswand des Jochteils des Bügelhandgriffs, eine einzelne Druckfeder eingesetzt ist, mit der mindestens ein Teil der auf den Bügelhandgriff aufgebrachten Andruckkraft symmetrisch zur Längsmittelebene in die Koppelglieder eingleitet werden kann.A preferred embodiment of the invention provides that the point of intersection of the two coupling members is arranged in a longitudinal center plane of the power tool and that between the crossing point and the bow handle, preferably between the crossing point and a remote from the housing of the power tool rear bounding wall of the yoke portion of the strap handle, a single compression spring is used, with the at least part of the pressure applied to the strap handle pressure force can be symmetrically introduced to the longitudinal center plane in the coupling elements.

Um den Schwenkweg der Koppelglieder innerhalb des begrenzten Hohlraums des Jochteils und damit den Bewegungsweg des Bügelhandgriffs zwischen einer vorderen und einer hinteren Endstellung so groß wie möglich zu machen, sind die anderen, nicht an den Fortsätzen angelenkten Stirnenden der Koppelglieder gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung jeweils gelenkig mit Wandvorsprüngen verbunden, die über eine dem Gehäuse der Handwerkzeugmaschine zugewandte vordere Begrenzungswand des Jochteils in dessen hohles Inneres hinein überstehen.In order to make the pivoting of the coupling links within the limited cavity of the yoke part and thus the movement path of the strap handle between a front and a rear end position as large as possible, are the other, not hinged to the extensions front ends of the coupling members according to a further advantageous embodiment of the invention each hingedly connected to wall projections, which over a the housing of the Hand tool machine facing front boundary wall of the yoke part in the hollow inside survive.

Durch Veränderung des Abstands der Vorsprünge von der Längsmittelebene der Werkzeugmaschine kann zudem die Länge eines Hebelarms jedes Koppelgliedes eingestellt werden, der sich von einem am Kreuzungspunkt befindlichen Schwenkgelenk bis zu einem am Vorsprung befindlichen Schwenkgelenk erstreckt. Dies wiederum gestattet es, den Federweg der Feder bei der Bewegung des Bügelhandgriffs aus der hinteren in die vordere Endstellung an die Federkennlinie vorhandener Federn anzupassen.By changing the distance of the projections from the longitudinal center plane of the machine tool, the length of a lever arm of each coupling member can be adjusted, which extends from a pivot point at the pivot point to a swivel joint located on the projection. This in turn makes it possible to adjust the spring travel of the spring during the movement of the strap handle from the rear to the front end position of the spring characteristic existing springs.

Zur Vereinfachung der Herstellung, Lagerhaltung und Montage sind die beiden Koppelglieder zweckmäßig geradlinige Koppelstangen die gleiche Formen und Abmessungen besitzen.To simplify the production, warehousing and assembly, the two coupling members are suitably straight-line coupling rods have the same shapes and dimensions.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Im folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:

  • Fig. 1: eine vereinfachte schematische Seitenansicht einer Handwerkzeugmaschine;
  • Fig. 2: eine teilweise geschnittene vergrößerte Seitenansicht eines Bügelhandgriffs der Handwerkzeugmaschine aus Fig. 1 in unbelastetem Zustand;
  • Fig. 3: eine Ansicht entsprechend Fig. 2, jedoch nach dem Anpressen der Handwerkzeugmaschine gegen ein Werkstück unter Aufbringen einer Andruckkraft auf den Bügelhandgriff.
In the following the invention will be explained in more detail with reference to an embodiment shown in the drawing. Show it:
  • Fig. 1 a simplified schematic side view of a hand tool;
  • Fig. 2 a partially sectioned enlarged side view of a strap handle of the power tool from Fig. 1 in unloaded condition;
  • Fig. 3 : a view accordingly Fig. 2 However, after pressing the power tool against a workpiece while applying a pressing force on the strap handle.

Ausführungsform der ErfindungEmbodiment of the invention

Die in Fig. 1 schematisch dargestellte Handwerkzeugmaschine 2 in Form eines Bohrhammers oder eines Schlaghammers besteht im Wesentlichen aus einem Gehäuse 4, einem Werkzeughalter 6 zur Aufnahme eines Werkzeugs 8, sowie einer vom Gehäuse 4 umschlossenen Antriebseinrichtung (nicht dargestellt) zum drehenden und schlagenden Antreiben des in den Werkzeughalter 6 eingesetzten Werkzeugs 8.In the Fig. 1 Hand tool 2 shown schematically in the form of a hammer drill or a percussion hammer consists essentially of a Housing 4, a tool holder 6 for receiving a tool 8, and a drive means (not shown) enclosed by the housing 4 for rotating and beating driving the tool 8 inserted into the tool holder 6.

Die Antriebseinrichtung besteht in bekannter Weise aus einem elektrischen Antriebsmotor, der den Werkzeughalter 6 über ein Untersetzungs- bzw. Schaltgetriebe drehend antreibt, sowie einem ebenfalls vom Antriebsmotor angetriebenen Schlagwerk, mit dem das Werkzeug 8 im Werkzeughalter 6 mit einer in einer Arbeitsrichtung A der Werkzeugmaschine 2 wirkenden Schlagkraft beaufschlagt werden kann.The drive device consists in a known manner of an electric drive motor which rotatably drives the tool holder 6 via a reduction or manual transmission, and a likewise driven by the drive motor percussion, with which the tool 8 in the tool holder 6 with a working direction A of the machine tool. 2 acting impact force can be applied.

Das Gehäuse 4 ist an seinem vom Werkzeughalter 6 abgewandten hinteren Stirnende mit einem Bügelhandgriff 10 versehen, der zusammen mit einem in der Nähe des Werkzeughalters 6 bei 12 lösbar am Gehäuse 4 angebrachten Zusatzhandgriff 14 zum Ergreifen und Halten der Werkzeugmaschine 2 dient. Der über das Gehäuse 4 überstehende Bügelhandgriff 10 umschließt zusammen mit dem Gehäuse 4 eine Grifföffnung 16 für eine Hand eines Bedieners und erleichtert besonders im senkrechten Betrieb, das heißt bei vertikaler Arbeitsrichtung A und nach unten gerichtetem Werkzeug 8, das Festhalten und Führen der Werkzeugmaschine 2, während der Zusatzhandgriff 14 bevorzugt bei horizontal ausgerichteter oder flach geneigter Arbeitsrichtung A zum Einsatz kommt.The housing 4 is provided at its rear end remote from the tool holder 6 with a strap handle 10 which serves together with a near the tool holder 6 at 12 releasably attached to the housing 4 auxiliary handle 14 for gripping and holding the machine tool 2. The over the housing 4 protruding strap handle 10 encloses together with the housing 4 a handle opening 16 for a hand of an operator and facilitates particularly in vertical operation, that is in the vertical direction A and downwardly directed tool 8, the holding and guiding the machine tool 2, while the auxiliary handle 14 is preferably used in horizontally oriented or flat inclined working direction A used.

Wie am besten in den Figuren 2 und 3 dargestellt, weist das Gehäuse 4 zwei parallele, nach hinten über das hintere Stirnende 18 des Gehäuses 4 überstehende Fortsätze 20, 22 auf, die starr mit dem Gehäuse 4 verbunden sind und ins hohle Innere des Bügelhandgriffs 10 ragen.How best in the FIGS. 2 and 3 shown, the housing 4 has two parallel, rearwardly beyond the rear end face 18 of the housing 4 protruding extensions 20, 22 which are rigidly connected to the housing 4 and project into the hollow interior of the strap handle 10.

Der Bügelhandgriff 10 besteht im Wesentlichen aus einem zur Arbeitsrichtung A der Handwerkzeugmaschine 2 senkrechten hohlen Jochteil 24, der zum Gebrauch der Handwerkzeugmaschine 2 vom Benutzer mit einer Hand ergriffen wird, sowie zwei zur Arbeitsrichtung A der Handwerkzeugmaschine 2 parallelen hohlen Schenkelteilen 26, 28, die an ihren zum Gehäuse 4 benachbarten Stirnenden offen sind, so dass die Fortsätze 20, 22 des Gehäuses 4 in die Schenkelteile 26, 28 eintauchen können.The hanger handle 10 consists essentially of a direction perpendicular to the working direction A of the power tool 2 hollow yoke 24, which is taken for use of the power tool 2 by the user with one hand, and two parallel to the working direction A of the power tool 2 hollow leg portions 26, 28, the her to the housing 4 adjacent Front ends are open, so that the extensions 20, 22 of the housing 4 can dip into the leg portions 26, 28.

Um zu vermeiden, dass zum Beispiel vom Schlagwerk der Werkzeugmaschine 2 hervorgerufene Vibrationen des Gehäuses 4 auf den Bügelhandgriff 10 übertragen werden, was vom Bediener nicht nur als unangenehm empfunden wird, sondern bei längerer Exposition auch Gesundheitsschäden zur Folgen haben kann, tauchen die beiden Fortsätze 20, 22 des Gehäuses 4 mit großem seitlichem Spiel S in die hohlen Schenkelteile 26, 28 des Bügelhandgriffs 10 ein. Außerdem stützt sich der Bügelhandgriff 10 nicht direkt auf den Fortsätzen 20, 22 oder auf dem Gehäuse 4 ab, sondern über eine Schraubendruckfeder 30, die für eine Schwingungsentkopplung zwischen dem Bügelhandgriff 10 und dem Gehäuse 4 sorgt.In order to avoid that, for example, vibrations of the housing 4 caused by the percussion mechanism of the machine tool 2 are transmitted to the hanger handle 10, which is not only perceived as unpleasant by the operator, but may also result in health damage during prolonged exposure, the two extensions 20 dip , 22 of the housing 4 with large lateral play S in the hollow leg portions 26, 28 of the strap handle 10 a. In addition, the hanger handle 10 is not supported directly on the extensions 20, 22 or on the housing 4, but via a helical compression spring 30, which provides for a vibration isolation between the hanger handle 10 and the housing 4.

Um ein Verkanten oder Verkippen des derart vom Gehäuse 4 entkoppelten Bügelhandgriffs 10 zu vermeiden, wenn beim Arbeiten mit der Handwerkzeugmaschine eine Andruckkraft F (Fig. 3) auf den Bügelhandgriff 10 aufgebracht wird und diese Andruckkraft F entweder nicht parallel zur Arbeitsrichtung A oder einseitig auf einer Seite einer Längsmittelebene 32 (Fig. 1) der Handwerkzeugmaschine 2 eingeleitet wird, werden die Bewegungen der beiden hohlen Schenkelteile 26, 28 entlang der Fortsätze 20, 22 mit Hilfe zweier Koppelstangen 34, 36 synchronisiert.In order to avoid jamming or tilting of the bow-type handle 10 decoupled in this way from the housing 4, when a pressing force F (FIG. Fig. 3 ) is applied to the hanger handle 10 and this pressure force F either not parallel to the working direction A or on one side on one side of a longitudinal center plane 32 (FIG. Fig. 1 ) of the power tool 2 is initiated, the movements of the two hollow leg portions 26, 28 along the extensions 20, 22 by means of two coupling rods 34, 36 are synchronized.

Die beiden geraden, langgestreckten Koppelstangen 34, 36 sind im hohlen Inneren des Jochteils 24 des Bügelhandgriffs 10 untergebracht, wobei sie allgemein quer zur Arbeitsrichtung A und der Längsmittelebene 32 der Handwerkzeugmaschine 2 ausgerichtet sind. Das äußere, d.h. in größerem Abstand von der Längsmittelebene 32 angeordnete Stirnende jeder Koppelstange 34, 36 ist über ein Schwenkgelenk 38 bzw. 40 am freien Ende eines benachbarten Fortsatzes 20 bzw. 22 angelenkt, während das entgegengesetzte innere, d.h. in geringerem Abstand von der Längsmittelebene 32 angeordnete Stirnende jeder Koppelstange 34, 36 über ein weiteres Schwenkgelenk 42 bzw. 44 an einem Vorsprung 46 bzw. 48 angelenkt ist, der auf der zum Schwenkgelenk 38 bzw. 40 entgegengesetzten Seite der Längsmittelebene 32 über eine dem Gehäuse 4 zugewandte vordere Begrenzungswand 50 des Jochteils 24 ins Innere desselben übersteht, so dass sich die beiden Koppelstangen 34, 36 kreuzen. Die Koppelstangen 34, 36 sind an ihrem Kreuzungspunkt über ein fünftes Schwenkgelenk 52 gelenkig miteinander verbunden. Die Schwenkachse des Schwenkgelenks 52 ist parallel zu den Schwenkachsen der anderen Schwenkgelenke 38, 40, 42, 44 ausgerichtet und liegt in der Längsmittelebene 32 der Handwerkzeugmaschine 2.The two straight, elongated coupling rods 34, 36 are housed in the hollow interior of the yoke part 24 of the strap handle 10, wherein they are generally aligned transversely to the working direction A and the longitudinal center plane 32 of the power tool 2. The outer, that is arranged at a greater distance from the longitudinal center plane 32 front end of each coupling rod 34, 36 is articulated via a pivot joint 38 and 40 at the free end of an adjacent extension 20 and 22, while the opposite inner, ie at a smaller distance from the longitudinal center plane 32 arranged front end of each coupling rod 34, 36 is articulated via a further pivot joint 42 and 44 on a projection 46 and 48, on the side facing the pivot joint 38 and 40 side of the longitudinal center plane 32 via a housing 4 facing the front Boundary wall 50 of the yoke part 24 protrudes into the interior thereof, so that the two coupling rods 34, 36 intersect. The coupling rods 34, 36 are pivotally connected to each other at their crossing point via a fifth pivot 52. The pivot axis of the pivot joint 52 is aligned parallel to the pivot axes of the other pivot joints 38, 40, 42, 44 and lies in the longitudinal center plane 32 of the power tool 2.

Die beiden Koppelstangen 34, 36 stützen sich an ihrem Kreuzungspunkt bzw. am Schwenkgelenk 52 über die Schraubendruckfeder 30 gegen eine vom Gehäuse 4 abgewandte hintere Begrenzungswand 54 des Jochteils 24 ab, so dass eine auf den Bügelhandgriff 10 aufgebrachte Andruckkraft F mindestens zum Teil über die Schraubdruckfeder 30 in die Koppelstangen 34, 36 und über diese in die Fortsätze 20, 22 des Gehäuses 4 eingeleitet wird.The two coupling rods 34, 36 are supported at their intersection point or on the pivot joint 52 via the helical compression spring 30 against a remote from the housing 4 rear boundary wall 54 of the yoke member 24, so that a force applied to the hanger handle 10 pressing force F at least partially via the helical compression spring 30 is introduced into the coupling rods 34, 36 and via these in the extensions 20, 22 of the housing 4.

Dabei wird die Schraubendruckfeder 30 bei steigender Andruckkraft F zunehmend mehr zusammengedrückt, wobei jedoch ihr Federweg, das heißt die Längendifferenz der Feder 30 zwischen ihrem leicht zusammengedrückten Zustand in der hinteren Endstellung des Bügelhandgriffs 10 (Fig. 2) und ihrem stärker zusammengedrückten Zustand in der vorderen Endstellung (Fig. 3) des Bügelhandgriffs 10, kleiner ist als der Bewegungsweg des Bügelhandgriffs 10, da sich infolge der unterschiedlich langen Hebelarme der Koppelstangen 34, 36 beiderseits des Schwenkgelenks 52 der Kreuzungspunkt der Koppelstangen 34, 36 bei der Bewegung des Bügelhandgriffs 10 aus der hinteren Endstellung in die vorderen Endstellung etwas mitbewegt, jedoch weniger weit als der Bügelhandgriff 10 selbst.In this case, the helical compression spring 30 is increasingly compressed with increasing pressure force F, but with their spring travel, that is, the length difference of the spring 30 between its slightly compressed state in the rear end position of the hanger handle 10 ( Fig. 2 ) and their more compressed state in the front end position ( Fig. 3 ) of the hanger handle 10, is smaller than the path of movement of the hanger handle 10, as a result of the different length lever arms of the coupling rods 34, 36 on both sides of the pivot joint 52 of the crossing point of the coupling rods 34, 36 in the movement of the hanger handle 10 from the rear end position in the front End position slightly moved, but less far than the strap handle 10 itself.

Die vordere Endstellung des Bügelhandgriffs 10 wird durch die Federkraft der zusammengedrückten Schraubendruckfeder 30 begrenzt, die der Bewegung entgegenwirkt und entsprechend dimensioniert wird. Die hintere Endstellung des Bügelhandgriffs 10 wird durch Anschlagen der beiden Koppelstangen 34, 36 gegen die Innenseite der vorderen Begrenzungswand 50 des Jochteils 24 seitlich neben den Vorsprüngen 46, 48 definiert, wodurch der Bewegungsweg des Bügelhandgriffs 10 weg vom Gehäuse 4 begrenzt wird.The front end position of the hanger handle 10 is limited by the spring force of the compressed helical compression spring 30, which counteracts the movement and is dimensioned accordingly. The rear end position of the hanger handle 10 is defined by striking the two coupling rods 34, 36 against the inside of the front boundary wall 50 of the yoke member 24 laterally adjacent to the projections 46, 48, whereby the movement path of the hanger handle 10 is limited away from the housing 4.

Claims (9)

  1. Portable power tool, in particular a rotary and/or percussion hammer, comprising a housing which has two parallel extensions, a hollow U-shaped bow-type handle having a yoke part and two parallel leg parts, said bow-type handle being movably and elastically supported with respect to the housing in order to dampen vibrations, the extensions of the housing extending into the two hollow leg parts of the bow-type handle, and two coupling elements which serve to synchronize movements of the leg parts and are accommodated in the yoke part of the bow-type handle and the outer end faces of which are connected to the extensions in an articulated manner, wherein the coupling elements (34, 36) are linked by means of their other end faces to the bow-type handle (10), cross one another and are connected to one another in an articulated manner at the crossing point.
  2. Portable power tool according to Claim 1, characterized in that the crossing point of the coupling elements (34, 36) is arranged in a centre plane (32) of the portable power tool and/or centrally between the two extensions (20, 22).
  3. Portable power tool according to Claim 1 or 2, characterized by a compression spring (30) arranged between the crossing point of the coupling elements (34, 36) and the bow-type handle (10).
  4. Portable power tool according to claim 3, characterized in that the compression spring (30) is arranged between the crossing point and a rear boundary wall (54), facing away from the housing (4) of the portable power tool (2), of the yoke part (24).
  5. Portable power tool according to one of the preceding claims, characterized in that the other end faces of the coupling elements (34, 36) are linked to respective projections (46, 48) which protrude beyond a front boundary wall (50) of the yoke part (24), facing the housing (4) of the portable power tool (2), into the interior of the yoke part (24).
  6. Portable power tool according to one of the preceding claims, characterized in that the two coupling elements (34, 36) have the same shape and dimensions.
  7. Portable power tool according to one of the preceding claims, characterized in that the two coupling elements (34, 36) are rectilinear coupling rods (34, 36).
  8. Portable power tool according to one of the preceding claims, characterized in that the distances of the opposite end faces of the two coupling elements (34, 36) from the crossing point are different.
  9. Portable power tool according to one of the preceding claims, characterized in that the two coupling elements (34, 36) form end stops for limiting a movement of the bow-type handle (10) in a rear end position remote from the housing (4) of the portable power tool (2).
EP07820408A 2006-11-09 2007-09-20 Hand machine tool with a vibration damped rounded handle Not-in-force EP2089191B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006052807A DE102006052807A1 (en) 2006-11-09 2006-11-09 Hand tool with a vibration-damped strap handle
PCT/EP2007/059970 WO2008055739A1 (en) 2006-11-09 2007-09-20 Hand machine tool with a vibration damped rounded handle

Publications (2)

Publication Number Publication Date
EP2089191A1 EP2089191A1 (en) 2009-08-19
EP2089191B1 true EP2089191B1 (en) 2010-02-03

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Application Number Title Priority Date Filing Date
EP07820408A Not-in-force EP2089191B1 (en) 2006-11-09 2007-09-20 Hand machine tool with a vibration damped rounded handle

Country Status (6)

Country Link
US (1) US7971655B2 (en)
EP (1) EP2089191B1 (en)
CN (1) CN101535006B (en)
AT (1) ATE456988T1 (en)
DE (2) DE102006052807A1 (en)
WO (1) WO2008055739A1 (en)

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US9010452B2 (en) 2011-10-13 2015-04-21 Susan J. Williamson Vibration dampening system for a handle of a machine that vibrates, and method of dampening vibrations produced by a machine
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CN115042117A (en) * 2018-05-29 2022-09-13 罗贝尔铁路建筑机械有限责任公司 Impact wrench for tightening and loosening nuts and screws on a rail
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Also Published As

Publication number Publication date
ATE456988T1 (en) 2010-02-15
DE502007002789D1 (en) 2010-03-25
DE102006052807A1 (en) 2008-05-15
CN101535006B (en) 2012-05-23
EP2089191A1 (en) 2009-08-19
US20090025950A1 (en) 2009-01-29
US7971655B2 (en) 2011-07-05
WO2008055739A1 (en) 2008-05-15
CN101535006A (en) 2009-09-16

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