EP2230051B1 - Hand tool with a counterweight - Google Patents

Hand tool with a counterweight Download PDF

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Publication number
EP2230051B1
EP2230051B1 EP10150917.2A EP10150917A EP2230051B1 EP 2230051 B1 EP2230051 B1 EP 2230051B1 EP 10150917 A EP10150917 A EP 10150917A EP 2230051 B1 EP2230051 B1 EP 2230051B1
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EP
European Patent Office
Prior art keywords
counterweight
hand tool
guide rail
slot
reciprocating movement
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.)
Active
Application number
EP10150917.2A
Other languages
German (de)
French (fr)
Other versions
EP2230051A1 (en
Inventor
Joerg Kriedel
Richard Engel
Otto Baumann
Hardy Schmid
Holger Ruebsaamen
Mario Patzig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Publication date
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Publication of EP2230051A1 publication Critical patent/EP2230051A1/en
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Publication of EP2230051B1 publication Critical patent/EP2230051B1/en
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Classifications

    • 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
    • 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
    • B25D11/062—Means for driving the impulse member comprising a wobbling mechanism, swash plate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0073—Arrangements for damping of the reaction force
    • B25D2217/0076—Arrangements for damping of the reaction force by use of counterweights
    • B25D2217/0088—Arrangements for damping of the reaction force by use of counterweights being mechanically-driven

Definitions

  • the invention relates to a hand tool according to claim 1, in particular a hammer drill, a percussion hammer or a saw, for example a saber saw.
  • the hand tool has a drive with a lift-generating element, wherein the drive is designed to move the lift-generating element along a translation axis, in particular periodically, back and forth.
  • the hand tool has at least one counterweight, in particular counter-oscillator, wherein the counterweight is operatively connected to the drive so that at least indirectly caused by the reciprocating motion forces can be at least partially compensated.
  • a hand tool according to the preamble of claim 1 is made DE 10 2008 000 677 A1 known.
  • the counterweight in the case of the hand tool, can be moved coaxially or parallel to the translation axis, in particular moved back and forth.
  • the counterweight is mounted in a different from the Huber Wegungselement guide means.
  • the guide means is a guide rail.
  • the hand tool has a receiving device for a tool, wherein the receiving device for the tool with the Huber Wegungselement is operatively connected.
  • the hand tool may have an impact mechanism in which a reciprocating beater is coupled by means of an air volume with the lift generating element, for example a piston.
  • the Huberzeugungselement can thus reciprocate the bat over the volume of air and thus move against a percussion receiver, in particular an anvil.
  • the counterweight is mounted in a particularly integrally formed liner as a guide means.
  • the liner can be formed for example by a pipe, a quiver or a hollow cylinder.
  • the particularly integrally formed bushing can advantageously be easily manufactured, for example by means of a continuous casting process.
  • the counterweight can be preassembled together with the liner and preferably smoothly lubricated provided for connection to the hand tool.
  • the liner is formed as a hollow cylinder.
  • the bushing is preferably designed to at least partially receive the counterweight.
  • the bushing preferably has a breakthrough for engagement of a wobble finger, wherein the counterweight is connected to the wobble finger such that the wobble finger can reciprocate the counterweight, in particular via a bolt through the opening. Due to the breakthrough for engagement of the wobble finger, the counterweight or additionally the bolt can advantageously be arranged in a space-saving manner in the hand tool, in particular a housing of the hand tool, together with the bush.
  • the liner has a mounting eye opening. Threading the counterweight or additionally the bolt onto the wobble finger can be observed through the mounting face opening or in particular be supported by reaching through the mounting eye opening. Due to the mounting eye opening advantageously the connection of the wobble finger with the counterweight - especially in comparison to a concealed installation - easier.
  • the hand tool has at least one guide bar.
  • the counterweight is connected to the guide rod such that the counterweight can be reciprocated in the longitudinal direction of the guide rod.
  • the counterweight at least partially has an opening, in particular a longitudinally extending lumen, in which the guide rod is arranged to pass through the lumen.
  • the counterweight can be so advantageous - the guide rod in the lumen at least partially receiving - on the guide rod back and forth.
  • the counterweight is connected to a guide rail and mounted reciprocably by means of the guide rail.
  • the counterweight has a slot into which the guide rail can in particular engage in such a form-fitting manner that the counterweight can perform a reciprocating motion in the direction of the slot.
  • the counterweight forms a rider which at least partially surrounds the guide bar on a longitudinal section and thus can be reciprocated relative to the guide bar.
  • the counterweight in particular the rider, advantageously secured transversely to the translation axis positively.
  • the counterweight may form a rider which at least partially encloses the guide rail on a longitudinal section.
  • the rider can thus be moved back and forth relative to the guide rail.
  • the rider can, for example, at least partially enclose the guide rail by means of a slot.
  • the guide means is preferably a continuous casting.
  • the guide means on a plastic, in particular a polymer or is formed from this.
  • the polymer may be, for example, polypropylene, polyethylene, polycarbonate, or polyamide.
  • the guide means is made of a metal, for example iron, cast iron, steel, light metal, especially aluminum or brass formed.
  • the guide means preferably has a sliding layer, for example polytetrafluoroethylene, on an inner wall formed for sliding contact with the counter-oscillator.
  • a weight of the hand tool is advantageously up to 3 kilograms.
  • FIG. 1 shows schematically an example of a hand tool, in this example a hammer drill.
  • the hand tool 1 has a drive with a drive motor 3.
  • the drive motor 3 has a drive shaft 4, at the end portion of a drive pinion is formed.
  • the drive of the drive shaft 4 is connected to a toothing of a gear 9 in operative engagement.
  • the gear 9 is arranged on an intermediate shaft 18, on which a wobble bearing 7 is arranged.
  • the wobble bearing 7 has a wobble finger 6, wherein the wobble finger 6 engages in an opening of a bolt 15 connected to a connecting rod 8.
  • the connecting rod 8 is connected to a lift generating element 5.
  • the Huberzeugungselement 5 is formed in this example as a piston.
  • the lift generating element 5 is operatively connected via an air volume with a reciprocating racket 10.
  • connecting rod 8 may also be provided a push rod which rotatably receives the bolt at least partially about a transverse to a longitudinal axis of the push rod axis of rotation, so that the tumble finger 6 can reciprocate in an opening of the bolt 15.
  • the wobble finger 6 can thus reciprocate the Huber Wegungselement by the drive motor 3 when the intermediate shaft 18 is rotated.
  • the lift generating element 5, the racket 10 and an anvil or striker 11 are arranged together in a lumen 9 within a tool spindle 14.
  • the tool spindle 14 has a receiving device 32 for a tool in the region of one end.
  • the tool spindle 14 has a spindle drive wheel 16 with a toothing, which is in meshing engagement with a gear 17, wherein the gear 17 is arranged on the intermediate shaft 18.
  • a wobble bearing 22 is arranged by the gear 17 at a predetermined distance along an intermediate shaft axis of the intermediate shaft 18 and rotatably connected to the intermediate shaft 18.
  • the wobble bearing 22 is connected to a wobble finger 24, wherein the wobble finger 24 engages in a pin 26.
  • the bolt 26 is cylindrical and is arranged in a counterweight designed as a counterweight 12.
  • the guide means 20 also has a further opening 29, which is opposite to the opening 28 - circumferentially about the translation axis 25 - and which threading the wobble finger 24 during assembly of the counterweight 12 together with the guide means 20, for example, to a housing of the hand tool, advantageously facilitated.
  • the lifting element 5, the racket 10 and the connecting rod 8 are arranged reciprocable along a translation axis 30, wherein the translation axis 30 in this example also forms a striking axis along which the racket 10 can strike against the anvil or striker 11.
  • FIG. 2 shows an example of a part of a hammer drill, for example, the in FIG. 1 already shown schematically hammer drill 1.
  • the counterweight is in FIG. 2 for a better understanding of the operative engagement without the guide means 20 shown in FIG.
  • Two screw domes are molded to a housing part, in which the in FIG. 1 Guide means shown can be attached.
  • the screw dome 42 is exemplified.
  • the housing part is, for example, a bearing flange, which at least partially accommodates and / or supports movable parts, for example the intermediate shaft or the tool spindle or both. Shown is also the in FIG. 1 shown swash bearing 7, which drives the Huber Wegungselement 5.
  • FIG. 3 shows an example of a guide means 20.
  • the guide means 20 has already been in FIG. 1 in connection with in FIG. 1 shown hand tool 1 shown.
  • the guide means 20 is formed in this example as a bush in the form of a hollow cylinder, wherein the hollow cylinder has a fastening web, in which two mounting holes for attaching the guide means 20, for example, to the in FIG. 2 shown lingdomen, namely a mounting hole 40 and a mounting hole 41 are located.
  • Shown is also formed as a slot breakthrough 28, through which in the FIGS. 1 and 2 already shown tumble finger 24 can pass through and so the back disposed in the lumen of the guide means 20 counterweight 12 can reciprocate.
  • the opening 28 is formed in this example as a slot.
  • the breakthrough 28 may be designed in the form of a slot which extends over a longitudinal section or the entire length of the guide means 20. Shown is also formed in this example as a slot breakthrough 29, which facilitates assembly, in particular a threading of the wobble finger 24 in the bolt 26 and the counterweight 12.
  • FIG. 4 shows an embodiment of a counterweight 21 with integrated guide means, which - unlike the guide means 20 in the FIGS. 1 . 2 and 3 - Solid and at least partially cylindrical.
  • a web in which a slot 54 is formed.
  • An illustration 56 shows the counterweight 21 in a sectional view along a section 55.
  • the elongated hole 54 is designed to engage a guide rail 50.
  • the guide rail 50 has transversely to a guide rail longitudinal direction to a tapered stepped end, which is formed to the cross-cut through the slot 54.
  • the guide rail has a preferably cylindrical recess for fastening the guide rail 50.
  • Shown is also a part of a housing 52 to which the guide rail 50 is fastened by means of a heel screw 57.
  • the counterweight 21 is driven by a - not shown in this figure - wobble finger, which extends into a rotatably mounted in the counterweight 21 bolt and is thus operatively connected to the counterweight 21.
  • FIG. 5 shows an example of a counterweight 13, which - unlike that in FIG. 1 and the counterweight 12 shown in Figure two - is guided on a guide rod 60.
  • the counterweight 13 has a longitudinally extending in the counterweight 13 lumen through which the guide rod 60 is passed.
  • the counterweight 13 can thus be reciprocated on the guide rod 60 as a rider.
  • the guide rod 60 engages in an angle 53 of a housing of the hammer drill and is thus connected to the housing.
  • Shown is also a tool spindle, for example, in FIG. 1
  • the counterweight 13 is driven by a - not shown in this figure - wobble finger, which extends into a rotatably mounted in the counterweight 13 bolt and is so operatively connected to the counterweight 13.

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Handwerkzeug, gemäß dem Anspruch 1, insbesondere einen Bohrhammer, einen Schlaghammer oder eine Säge, beispielsweise eine Säbelsäge. Das Handwerkzeug weist einen Antrieb mit einem Huberzeugungselement auf, wobei der Antrieb ausgebildet ist, das Huberzeugungselement entlang einer Translationsachse, insbesondere periodisch, hin- und herzubewegen. Das Handwerkzeug weist wenigstens ein Gegengewicht, insbesondere Gegenschwinger auf, wobei das Gegengewicht mit dem Antrieb derart wirkverbunden ist, dass wenigstens durch die Hin- und Herbewegung mindestens mittelbar verursachte Kräfte wenigstens teilweise kompensiert werden können.The invention relates to a hand tool according to claim 1, in particular a hammer drill, a percussion hammer or a saw, for example a saber saw. The hand tool has a drive with a lift-generating element, wherein the drive is designed to move the lift-generating element along a translation axis, in particular periodically, back and forth. The hand tool has at least one counterweight, in particular counter-oscillator, wherein the counterweight is operatively connected to the drive so that at least indirectly caused by the reciprocating motion forces can be at least partially compensated.

Bei aus dem Stand der Technik bekannten Handwerkzeugen besteht das Problem, dass der Gegenschwinger während eines Fertigens des Handwerkzeuges aufwändig montiert werden muss, insbesondere wenn der Gegenschwinger mit einem Taumellager verbunden ist und über dieses angetrieben ist.In the case of hand tools known from the prior art, there is the problem that the counteroscillator must be laboriously mounted during manufacture of the hand tool, in particular when the counteroscillator is connected to a swash bearing and is driven by this.

Ein Handwerkzeug gemäß dem Oberbegriff des Anspruchs 1 ist aus DE 10 2008 000 677 A1 bekannt.A hand tool according to the preamble of claim 1 is made DE 10 2008 000 677 A1 known.

Offenbarung der ErfindungDisclosure of the invention

Erfindungsgemäß ist bei dem Handwerkzeug das Gegengewicht koaxial oder parallel zur Translationsachse bewegbar, insbesondere hin- und herbewegbar gelagert. Bevorzugt ist das Gegengewicht in einem von dem Huberzeugungselement verschiedenen Führungsmittel gelagert. Das Führungsmittel ist eine Führungsschiene.According to the invention, in the case of the hand tool, the counterweight can be moved coaxially or parallel to the translation axis, in particular moved back and forth. Preferably, the counterweight is mounted in a different from the Huberzeugungselement guide means. The guide means is a guide rail.

Bevorzugt weist das Handwerkzeug eine Aufnahmevorrichtung für ein Werkzeug auf, wobei die Aufnahmevorrichtung für das Werkzeug mit dem Huberzeugungselement wirkverbunden ist.Preferably, the hand tool has a receiving device for a tool, wherein the receiving device for the tool with the Huberzeugungselement is operatively connected.

Beispielsweise kann das Handwerkzeug im Falle eines Bohrhammers oder eines Schlaghammers ein Schlagwerk aufweisen, bei dem ein hin- und herbewegbarer Schläger mittels eines Luftvolumens mit dem Huberzeugungselement, beispielsweise einem Kolben gekoppelt ist. Das Huberzeugungselement kann so den Schläger über das Luftvolumen hin- und herbewegen und so gegen einen Schlagempfänger, insbesondere einen Döpper bewegen.For example, in the case of a hammer drill or a percussion hammer, the hand tool may have an impact mechanism in which a reciprocating beater is coupled by means of an air volume with the lift generating element, for example a piston. The Huberzeugungselement can thus reciprocate the bat over the volume of air and thus move against a percussion receiver, in particular an anvil.

Durch das insbesondere mittels eines Führungsmittels beweglich gelagerte Gegengewicht kann vorteilhaft eine Montage des Gegengewichts beim Zusammenbau des Handwerkzeugs vereinfacht werden. Was Handwerkzeug ist dadurch vorteilhaft aufwandsgünstig herstellbar.By virtue of the counterweight movably mounted, in particular by means of a guide means, it is advantageously possible to simplify assembly of the counterweight during assembly of the hand tool. Which hand tool is advantageously low cost produced.

In einem Beispiel ist das Gegengewicht in einer insbesondere einstückig ausgebildeten Laufbuchse als Führungsmittel gelagert. Die Laufbuchse kann beispielsweise durch ein Rohr, einen Köcher oder einen Hohlzylinder gebildet sein. Die insbesondere einstückig ausgebildete Laufbuchse kann vorteilhaft einfach, beispielsweise mittels eines Strangguss-Verfahrens hergestellt sein. Weiter vorteilhaft kann das Gegengewicht zusammen mit der Laufbuchse vormontiert und bevorzugt leichtgängig geschmiert zum Verbinden mit dem Handwerkzeug bereitgestellt werden.In one example, the counterweight is mounted in a particularly integrally formed liner as a guide means. The liner can be formed for example by a pipe, a quiver or a hollow cylinder. The particularly integrally formed bushing can advantageously be easily manufactured, for example by means of a continuous casting process. Further advantageously, the counterweight can be preassembled together with the liner and preferably smoothly lubricated provided for connection to the hand tool.

In einem Beispiel ist die Laufbuchse als Hohlzylinder ausgebildet. Die Laufbuchse ist bevorzugt ausgebildet, das Gegengewicht wenigstens teilweise aufzunehmen. Die Laufbuchse weist bevorzugt einen Durchbruch zum Eingriff eines Taumelfingers auf, wobei das Gegengewicht mit dem Taumelfinger derart verbunden ist, dass der Taumelfinger das Gegengewicht insbesondere über einen Bolzen durch den Durchbruch hindurch hin- und herbewegen kann. Durch den Durchbruch zum Eingriff des Taumelfingers kann das Gegengewicht oder zusätzlich der Bolzen, zusammen mit der Laufbuchse vorteilhaft platzsparend in dem Handwerkzeug, insbesondere einem Gehäuse des Handwerkzeug angeordnet sein.In one example, the liner is formed as a hollow cylinder. The bushing is preferably designed to at least partially receive the counterweight. The bushing preferably has a breakthrough for engagement of a wobble finger, wherein the counterweight is connected to the wobble finger such that the wobble finger can reciprocate the counterweight, in particular via a bolt through the opening. Due to the breakthrough for engagement of the wobble finger, the counterweight or additionally the bolt can advantageously be arranged in a space-saving manner in the hand tool, in particular a housing of the hand tool, together with the bush.

In einem weiteren Beispiel weist die Laufbuchse eine Montagesichtöffnung auf. Durch die Montagesichtöffnung kann ein Auffädeln des Gegengewichts oder zusätzlich des Bolzens auf den Taumelfinger beobachtet oder insbesondere durch Durchgreifen durch die Montagesichtöffnung unterstützt werden. Durch die Montagesichtöffnung wird vorteilhaft das Verbinden des Taumelfingers mit dem Gegengewicht - insbesondere im Vergleich zu einer verdeckten Montage - erleichtert.In another example, the liner has a mounting eye opening. Threading the counterweight or additionally the bolt onto the wobble finger can be observed through the mounting face opening or in particular be supported by reaching through the mounting eye opening. Due to the mounting eye opening advantageously the connection of the wobble finger with the counterweight - especially in comparison to a concealed installation - easier.

In einem Beispiel weist das Handwerkzeug wenigstens eine Führungsstange auf. Das Gegengewicht ist mit der Führungsstange derart verbunden, dass das Gegengewicht in Längsrichtung der Führungsstange hin- und herbewegt werden kann. Bevorzugt weist das Gegengewicht wenigstens teilweise einen Durchbruch, insbesondere ein sich längserstreckendes Lumen auf, in dem die Führungsstange durch das Lumen hindurchführend angeordnet ist. Das Gegengewicht kann so vorteilhaft - die Führungsstange in dem Lumen wenigstens teilweiseweise aufnehmend - auf der Führungsstange hin- und herbewegt werden.In one example, the hand tool has at least one guide bar. The counterweight is connected to the guide rod such that the counterweight can be reciprocated in the longitudinal direction of the guide rod. Preferably, the counterweight at least partially has an opening, in particular a longitudinally extending lumen, in which the guide rod is arranged to pass through the lumen. The counterweight can be so advantageous - the guide rod in the lumen at least partially receiving - on the guide rod back and forth.

Erfindungsgemäß ist das Gegengewicht mit einer Führungsschiene verbunden und mittels der Führungsschiene hin- und herbewegbar gelagert. Bevorzugt weist das Gegengewicht ein Langloch auf, in das die Führungsschiene insbesondere derart formschlüssig eingreifen kann, dass das Gegengewicht in Richtung des Langlochs eine Hin- und Herbewegung ausführen kann.According to the invention, the counterweight is connected to a guide rail and mounted reciprocably by means of the guide rail. Preferably, the counterweight has a slot into which the guide rail can in particular engage in such a form-fitting manner that the counterweight can perform a reciprocating motion in the direction of the slot.

In einem Beispiel eines ähnlichen Handwerkzeug bildet das Gegengewicht einen Reiter, welcher die Führungsstange auf einem Längsabschnitt wenigstens teilweise umschließt und so relativ zu der Führungsstange hin- und herbewegt werden kann. Dadurch ist das Gegengewicht, insbesondere der Reiter, quer zur Translationsachse vorteilhaft formschlüssig gesichert.In one example of a similar hand tool, the counterweight forms a rider which at least partially surrounds the guide bar on a longitudinal section and thus can be reciprocated relative to the guide bar. As a result, the counterweight, in particular the rider, advantageously secured transversely to the translation axis positively.

Das Gegengewicht kann einen Reiter bilden, welcher die Führungsschiene auf einem Längsabschnitt wenigstens teilweise umschließt. Der Reiter kann so relativ zur Führungsschiene hin- und herbewegt werden. Der Reiter kann beispielsweise die Führungsschiene mittels eines Langlochs wenigstens teilweise umschließen.The counterweight may form a rider which at least partially encloses the guide rail on a longitudinal section. The rider can thus be moved back and forth relative to the guide rail. The rider can, for example, at least partially enclose the guide rail by means of a slot.

Das Führungsmittel ist bevorzugt ein Stranggussteil. Bevorzugt weist das Führungsmittel einen Kunststoff, insbesondere ein Polymer auf oder ist aus diesem gebildet. Das Polymer kann beispielsweise Polypropylen, Polyethylen, Polycarbonat, oder Polyamid sein. In einer anderen Ausführungsform ist das Führungsmittel aus einem Metall, beispielsweise Eisen, Gusseisen, Stahl, Leichtmetall, insbesondere Aluminium oder Messing gebildet. Das Führungsmittel weist bevorzugt an einer zum gleitenden Kontaktieren des Gegenschwingers ausgebildeten Innenwand eine Gleitschicht, beispielsweise Polytetrafluorethylen auf.The guide means is preferably a continuous casting. Preferably, the guide means on a plastic, in particular a polymer or is formed from this. The polymer may be, for example, polypropylene, polyethylene, polycarbonate, or polyamide. In another embodiment, the guide means is made of a metal, for example iron, cast iron, steel, light metal, especially aluminum or brass formed. The guide means preferably has a sliding layer, for example polytetrafluoroethylene, on an inner wall formed for sliding contact with the counter-oscillator.

Bevorzugt beträgt ein Gewicht des Handwerkzeugs vorteilhaft bis zu 3 Kilogramm.Preferably, a weight of the hand tool is advantageously up to 3 kilograms.

Die Erfindung wird nun im Folgenden anhand von Figuren und weiteren Beispielen erläutert.

  • Figur 1 zeigt schematisch ein Beispiel für ein als Bohrhammer ausgebildetes Handwerkzeug;
  • Figur 2 zeigt eine Aufsicht auf eine von einem Spindelantriebsrad getriebene Zwischenwelle mit einem Taumellager, welches über einen Taumelfinger mit einem Gegenschwinger in Wirkeingriff steht;
  • Figur 3 zeigt schematisch ein Beispiel für ein als Köcher ausgebildetes Führungsmittel zum Führen eines Gegenschwingers;
  • Figur 4 zeigt ein Ausführungsbeispiel gemäß der Erfindung, für einen Gegenschwinger für ein Handwerkzeug, welcher zum Geführtwerden mittels einer Führungsschiene ausgebildet ist;
  • Figur 5 zeigt schematisch ein Beispiel für einen auf einer Führungsstange geführten Gegenschwinger für ein Handwerkzeug.
The invention will now be explained below with reference to figures and further examples.
  • FIG. 1 shows schematically an example of a trained as a hammer drill hand tool;
  • FIG. 2 shows a plan view of an intermediate shaft driven by a Spindelantriebsrad with a swash bearing which is in operative engagement via a wobble finger with a counteroscillator;
  • FIG. 3 schematically shows an example of a trained as a quiver guide means for guiding a Gegenschwingers;
  • FIG. 4 shows an embodiment according to the invention, for a counter-oscillator for a hand tool, which is designed to be guided by means of a guide rail;
  • FIG. 5 shows schematically an example of a guided on a guide rod counter-oscillator for a hand tool.

Figur 1 zeigt schematisch ein Beispiel für ein Handwerkzeug, in diesem Beispiel einen Bohrhammer. Das Handwerkzeug 1 weist einen Antrieb mit einem Antriebsmotor 3 auf. Der Antriebsmotor 3 weist eine Antriebswelle 4 auf, an deren Endabschnitt ein Antriebsritzel ausgebildet ist. Das Antriebsrad der Antriebswelle 4 steht mit einer Verzahnung eines Zahnrades 9 im Wirkeingriff. Das Zahnrad 9 ist auf einer Zwischenwelle 18 angeordnet, auf welcher auch ein Taumellager 7 angeordnet ist. Das Taumellager 7 weist einen Taumelfinger 6 auf, wobei der Taumelfinger 6 in einen Durchbruch eines mit einem Pleuel 8 verbundenen Bolzens 15 eingreift. Das Pleuel 8 ist mit einem Huberzeugungselement 5 verbunden. Das Huberzeugungselement 5 ist in diesem Beispiel als Kolben ausgebildet. Das Huberzeugungselement 5 ist über einen Luftvolumen mit einem hin- und herbewegbaren Schläger 10 wirkverbunden. FIG. 1 shows schematically an example of a hand tool, in this example a hammer drill. The hand tool 1 has a drive with a drive motor 3. The drive motor 3 has a drive shaft 4, at the end portion of a drive pinion is formed. The drive of the drive shaft 4 is connected to a toothing of a gear 9 in operative engagement. The gear 9 is arranged on an intermediate shaft 18, on which a wobble bearing 7 is arranged. The wobble bearing 7 has a wobble finger 6, wherein the wobble finger 6 engages in an opening of a bolt 15 connected to a connecting rod 8. The connecting rod 8 is connected to a lift generating element 5. The Huberzeugungselement 5 is formed in this example as a piston. The lift generating element 5 is operatively connected via an air volume with a reciprocating racket 10.

Anstelle des Pleuels 8 kann auch eine Schubstange vorgesehen sein, welche den Bolzen wenigstens teilweise um eine quer zu einer Längsachse der Schubstange verlaufenden Drehachse drehbar aufnimmt, so dass der Taumelfinger 6 sich in einem Durchbruch des Bolzens 15 hin- und herbewegen kann. Der Taumelfinger 6 kann so bei einem Gedrehtwerden der Zwischenwelle 18 durch den Antriebsmotor 3 das Huberzeugungselement hin- und herbewegen.Instead of the connecting rod 8 may also be provided a push rod which rotatably receives the bolt at least partially about a transverse to a longitudinal axis of the push rod axis of rotation, so that the tumble finger 6 can reciprocate in an opening of the bolt 15. The wobble finger 6 can thus reciprocate the Huberzeugungselement by the drive motor 3 when the intermediate shaft 18 is rotated.

Das Huberzeugungselement 5, der Schläger 10 und ein Amboss oder Döpper 11 sind gemeinsam in einem Lumen 9 innerhalb einer Werkzeugspindel 14 angeordnet.The lift generating element 5, the racket 10 and an anvil or striker 11 are arranged together in a lumen 9 within a tool spindle 14.

Die Werkzeugspindel 14 weist im Bereich eines Endes eine Aufnahmevorrichtung 32 für ein Werkzeug auf. Die Werkzeugspindel 14 weist ein Spindelantriebsrad 16 mit einer Verzahnung auf, welche mit mit einem Zahnrad 17 kämmend in Wirkeingriff steht, wobei das Zahnrad 17 auf der Zwischenwelle 18 angeordnet ist. Auf der Zwischenwelle 18 ist von dem Zahnrad 17 in einem vorbestimmten Abstand entlang einer Zwischenwellenachse der Zwischenwelle 18 ein Taumellager 22 angeordnet und mit der Zwischenwelle 18 drehverbunden. Das Taumellager 22 ist mit einem Taumelfinger 24 verbunden, wobei der Taumelfinger 24 in einen Bolzen 26 eingreift. Der Bolzen 26 ist zylinderförmig ausgebildet und ist in einem als Gegenschwinger ausgebildeten Gegengewicht 12 angeordnet. Das Gegengewicht 12 ist - geführt durch ein Führungsmittel 20 - entlang einer Translationsachse 25 hin- und herbewegbar angeordnet. Das Führungsmittel 20 ist in diesem Beispiel als Laufbuchse in Form eines Hohlzylinders ausgebildet. Das Führungsmittel 20 weist einen sich längserstreckenden Durchbruch 28 auf, durch den der Taumelfinger 24 in das Gegengewicht 12 - über den Bolzen 26 - eingreift.The tool spindle 14 has a receiving device 32 for a tool in the region of one end. The tool spindle 14 has a spindle drive wheel 16 with a toothing, which is in meshing engagement with a gear 17, wherein the gear 17 is arranged on the intermediate shaft 18. On the intermediate shaft 18, a wobble bearing 22 is arranged by the gear 17 at a predetermined distance along an intermediate shaft axis of the intermediate shaft 18 and rotatably connected to the intermediate shaft 18. The wobble bearing 22 is connected to a wobble finger 24, wherein the wobble finger 24 engages in a pin 26. The bolt 26 is cylindrical and is arranged in a counterweight designed as a counterweight 12. The counterweight 12 is - guided by a guide means 20 - along a translation axis 25 back and forth arranged. The guide means 20 is formed in this example as a bushing in the form of a hollow cylinder. The guide means 20 has a longitudinally extending opening 28 through which the wobble finger 24 engages the counterweight 12 - via the bolt 26 -.

Das Führungsmittel 20 weist auch einen weiteren Durchbruch 29 auf, welcher zu dem Durchbruch 28 - in Umfangsrichtung um die Translationsachse 25 - gegenüberliegend angeordnet ist und welcher ein Einfädeln des Taumelfingers 24 bei einer Montage des Gegengewichts 12 zusammen mit dem Führungsmittel 20, beispielsweise an ein Gehäuse des Handwerkzeugs, vorteilhaft erleichtert.The guide means 20 also has a further opening 29, which is opposite to the opening 28 - circumferentially about the translation axis 25 - and which threading the wobble finger 24 during assembly of the counterweight 12 together with the guide means 20, for example, to a housing of the hand tool, advantageously facilitated.

Das Huberzeugungselement 5, der Schläger 10 und das Pleuel 8 sind entlang einer Translationsachse 30 hin- und herbewegbar angeordnet, wobei die Translationsachse 30 in diesem Beispiel auch eine Schlagachse bildet, entlang welcher der Schläger 10 gegen den Amboss oder Döpper 11 schlagen kann.The lifting element 5, the racket 10 and the connecting rod 8 are arranged reciprocable along a translation axis 30, wherein the translation axis 30 in this example also forms a striking axis along which the racket 10 can strike against the anvil or striker 11.

Figur 2 zeigt ein Beispiel für einen Teil eines Bohrhammers, beispielsweise den in Figur 1 bereits schematisch dargestellten Bohrhammer 1. In Figur 2 sind das Spindelantriebsrad 16, das Zahnrad 17 auf der Zwischenwelle 18, das Taumellager 22 und der in dem Gegengewicht 12 angeordnete Bolzen 26 bezeichnet, wobei der mit dem Taumellager 22 verbundene Taumelfinger 24 in den Bolzen 26 und somit auch in das Gegengewicht 12 eingreift. Das Gegengewicht ist in Figur 2 zum besseren Verständnis des Wirkeingriffs ohne das in Figur dargestellte Führungsmittel 20 dargestellt. Zwei Schraubdomen sind an ein Gehäuseteil angeformt, an der das in Figur 1 dargestellte Führungsmittel befestigt werden kann. Die Schraubdome 42 ist beispielhaft bezeichnet. Das Gehäuseteil ist beispielsweise ein Lagerflansch, welcher bewegliche Teile, beispielsweise die Zwischenwelle oder die Werkzeugspindel oder beide wenigstens teilweise aufnimmt und/oder lagert. Dargestellt ist auch das in Figur 1 gezeigte Taumellager 7, welches das Huberzeugungselement 5 antreibt. FIG. 2 shows an example of a part of a hammer drill, for example, the in FIG. 1 already shown schematically hammer drill 1. In FIG. 2 are the Spindelantriebsrad 16, the gear 17 on the intermediate shaft 18, the swash bearing 22 and arranged in the counterweight 12 bolts 26, said connected to the swash bearing 22 wobble finger 24 engages in the pin 26 and thus also in the counterweight 12. The counterweight is in FIG. 2 for a better understanding of the operative engagement without the guide means 20 shown in FIG. Two screw domes are molded to a housing part, in which the in FIG. 1 Guide means shown can be attached. The screw dome 42 is exemplified. The housing part is, for example, a bearing flange, which at least partially accommodates and / or supports movable parts, for example the intermediate shaft or the tool spindle or both. Shown is also the in FIG. 1 shown swash bearing 7, which drives the Huberzeugungselement 5.

Figur 3 zeigt ein Beispiel für ein Führungsmittel 20. Das Führungsmittel 20 wurde bereits in Figur 1 im Zusammenhang mit dem in Figur 1 gezeigten Handwerkzeug 1 dargestellt. Das Führungsmittel 20 ist in diesem Beispiel als Laufbuchse in Form eines Hohlzylinders ausgebildet, wobei der Hohlzylinder einen Befestigungssteg aufweist, in dem sich zwei Befestigungslöcher zum Befestigen des Führungsmittels 20 beispielsweise an den in Figur 2 gezeigten Schraubdomen, nämlich ein Befestigungsloch 40 und ein Befestigungsloch 41 befinden. Dargestellt ist auch der als Langloch ausgebildete Durchbruch 28, durch den der in den Figuren 1 und 2 bereits dargestellte Taumelfinger 24 durchgreifen kann und so das in dem Lumen des Führungsmittels 20 angeordnete Gegengewicht 12 hin- und herbewegen kann. Der Durchbruch 28 ist in diesem Beispiel als Langloch ausgebildet. Anders-jedoch gleichwirkend kann der Durchbruch 28 in Form eines Schlitzes ausgebildet sein, welcher sich über einen Längsabschnitt oder die gesamte Länge des Führungsmittels 20 erstreckt. Dargestellt ist auch die in diesem Beispiel als Langloch ausgebildete Durchbruch 29, welcher eine Montage, insbesondere ein Einfädeln des Taumelfingers 24 in den Bolzen 26 und das Gegengewicht 12 erleichtert. FIG. 3 shows an example of a guide means 20. The guide means 20 has already been in FIG. 1 in connection with in FIG. 1 shown hand tool 1 shown. The guide means 20 is formed in this example as a bush in the form of a hollow cylinder, wherein the hollow cylinder has a fastening web, in which two mounting holes for attaching the guide means 20, for example, to the in FIG. 2 shown Schraubdomen, namely a mounting hole 40 and a mounting hole 41 are located. Shown is also formed as a slot breakthrough 28, through which in the FIGS. 1 and 2 already shown tumble finger 24 can pass through and so the back disposed in the lumen of the guide means 20 counterweight 12 can reciprocate. The opening 28 is formed in this example as a slot. In a different manner, however, the breakthrough 28 may be designed in the form of a slot which extends over a longitudinal section or the entire length of the guide means 20. Shown is also formed in this example as a slot breakthrough 29, which facilitates assembly, in particular a threading of the wobble finger 24 in the bolt 26 and the counterweight 12.

Figur 4 zeigt ein Ausführungsbeispiel für ein Gegengewicht 21 mit integriertem Führungsmittel, welches - anders als das Führungsmittel 20 in den Figuren 1,2 und 3 - massiv und wenigstens teilweise zylinderförmig ausgebildet ist. An den massiv ausgebildeten Zylinder ist ein Steg angeformt, in welchem ein Langloch 54 ausgebildet ist. FIG. 4 shows an embodiment of a counterweight 21 with integrated guide means, which - unlike the guide means 20 in the FIGS. 1 . 2 and 3 - Solid and at least partially cylindrical. To the solid cylinder is formed a web in which a slot 54 is formed.

Eine Abbildung 56 zeigt das Gegengewicht 21 in einer Schnittdarstellung entlang eines Schnittes 55.An illustration 56 shows the counterweight 21 in a sectional view along a section 55.

Das Langloch 54 ist zum Eingriff einer Führungsschiene 50 ausgebildet. Die Führungsschiene 50 weist quer zu einer Führungsschienenlängsrichtung ein sich verjüngend abgestuftes Ende auf, welches zum Durchgreifenden durch das Langloch 54 ausgebildet ist. Im Bereich eines anderen Endes weist die Führungsschiene eine vorzugsweise zylinderförmige Ausnehmung zum Befestigen der Führungsschiene 50 auf. Dargestellt ist auch ein Teil eines Gehäuses 52, an welchem die Führungsschiene 50 mittels einer Absatzschraube 57 befestigt ist. Beispielsweise wird das Gegengewicht 21 durch einen - in dieser Figur nicht dargestellten - Taumelfinger angetrieben, der in einen im Gegengewicht 21 drehbar gelagerten Bolzen hineinreicht und so mit dem Gegengewicht 21 wirkverbunden ist.The elongated hole 54 is designed to engage a guide rail 50. The guide rail 50 has transversely to a guide rail longitudinal direction to a tapered stepped end, which is formed to the cross-cut through the slot 54. In the region of another end, the guide rail has a preferably cylindrical recess for fastening the guide rail 50. Shown is also a part of a housing 52 to which the guide rail 50 is fastened by means of a heel screw 57. For example, the counterweight 21 is driven by a - not shown in this figure - wobble finger, which extends into a rotatably mounted in the counterweight 21 bolt and is thus operatively connected to the counterweight 21.

Figur 5 zeigt ein Beispiel für einen Gegengewicht 13, welches - anders als das in Figur 1 und das in Figur zwei dargestellte Gegengewicht 12 - auf einer Führungsstange 60 geführt ist. Das Gegengewicht 13 weist ein sich längs in dem Gegengewicht 13 erstreckendes Lumen auf, durch welches die Führungsstange 60 hindurchgeführt ist. Das Gegengewicht 13 kann so auf der Führungsstange 60 als Reiter hin- und herbewegt werden. Die Führungsstange 60 greift in einen Winkel 53 eines Gehäuses des Bohrhammers ein und ist so mit dem Gehäuse verbunden. Dargestellt ist auch eine Werkzeugspindel, beispielsweise die in Figur 1 gezeigte Werkzeugspindel 14. Beispielsweise wird das Gegengewicht 13 durch einen - in dieser Figur nicht dargestellten - Taumelfinger angetrieben, der in einen im Gegengewicht 13 drehbar gelagerten Bolzen hineinreicht und so mit dem Gegengewicht 13 wirkverbunden ist. FIG. 5 shows an example of a counterweight 13, which - unlike that in FIG. 1 and the counterweight 12 shown in Figure two - is guided on a guide rod 60. The counterweight 13 has a longitudinally extending in the counterweight 13 lumen through which the guide rod 60 is passed. The counterweight 13 can thus be reciprocated on the guide rod 60 as a rider. The guide rod 60 engages in an angle 53 of a housing of the hammer drill and is thus connected to the housing. Shown is also a tool spindle, for example, in FIG. 1 For example, the counterweight 13 is driven by a - not shown in this figure - wobble finger, which extends into a rotatably mounted in the counterweight 13 bolt and is so operatively connected to the counterweight 13.

Claims (4)

  1. Hand tool (1), in particular hammer drill, percussion hammer or saw, having a drive and having a stroke-generating element (5), wherein the drive is configured to move the stroke-generating element (5) in particular periodically in a reciprocating movement along a translation axis (30), wherein the hand tool (1) has at least one counterweight (12) which is operatively connected to the drive such that forces caused at least indirectly at least by the reciprocating movement can be at least partially compensated, wherein the counterweight (12) is mounted so as to be movable, in particular movable in a reciprocating movement, coaxially with or parallel to the translation axis (30), characterized in that the counterweight is connected to a guide rail (50) and is mounted so as to be movable in a reciprocating movement by means of the guide rail (50), wherein the counterweight (21) has a slot (54) in which the guide rail (50) can engage in a form-fitting manner such that the counterweight (21) can execute a reciprocating movement in the direction of the slot (54).
  2. Hand tool (1) according to Claim 1, characterized in that the counterweight (21) is configured in a solid and at least partially cylindrical manner, wherein a rib, in which the slot (54) is formed, is integrally formed on the counterweight (21).
  3. Hand tool (1) according to Claim 1 or 2, characterized in that the guide rail (50) has an end that is tiered in a narrowing manner transversely to a guide-rail longitudinal axis, said end being configured to pass through the slot (54).
  4. Hand tool according to one of the preceding claims, characterized in that the counterweight (21) is driven by a wobble finger which reaches into a pin mounted rotatably in the counterweight (21) and in this way is operatively connected to the counterweight (21).
EP10150917.2A 2009-03-17 2010-01-18 Hand tool with a counterweight Active EP2230051B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009001590A DE102009001590A1 (en) 2009-03-17 2009-03-17 Hand tool with a counter-oscillator

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EP2230051A1 EP2230051A1 (en) 2010-09-22
EP2230051B1 true EP2230051B1 (en) 2015-11-25

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DE (1) DE102009001590A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008000677A1 (en) * 2008-03-14 2009-09-17 Robert Bosch Gmbh Hand tool for impact driven tools
US8636081B2 (en) 2011-12-15 2014-01-28 Milwaukee Electric Tool Corporation Rotary hammer
US9630307B2 (en) 2012-08-22 2017-04-25 Milwaukee Electric Tool Corporation Rotary hammer
FR3054154B1 (en) * 2016-07-21 2019-05-10 Europe Technologies ROBOTISE DRYING METHOD AND ROBOTIC SYSTEM FOR IMPLEMENTING THE METHOD
EP3697574A1 (en) 2017-10-20 2020-08-26 Milwaukee Electric Tool Corporation Percussion tool
US11059155B2 (en) 2018-01-26 2021-07-13 Milwaukee Electric Tool Corporation Percussion tool

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5566458A (en) * 1994-12-13 1996-10-22 Milwaukee Electric Tool Corporation Clutch mechanism for reciprocating saws
DE19851888C1 (en) * 1998-11-11 2000-07-13 Metabowerke Kg Hammer drill
EP1932627A3 (en) * 2003-03-21 2014-08-13 Black & Decker, Inc. Vibration reduction apparatus for power tool and power tool incorporating such apparatus
WO2005105386A1 (en) * 2004-04-30 2005-11-10 Makita Corporation Working tool
JP2007175836A (en) * 2005-12-28 2007-07-12 Hitachi Koki Co Ltd Striking tool
CN101062558B (en) * 2006-04-29 2012-01-25 苏州宝时得电动工具有限公司 Electric hammer
JP4756474B2 (en) * 2006-07-20 2011-08-24 日立工機株式会社 Electric tool
JP4863942B2 (en) * 2006-08-24 2012-01-25 株式会社マキタ Impact tool
DE102008000677A1 (en) * 2008-03-14 2009-09-17 Robert Bosch Gmbh Hand tool for impact driven tools

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EP2230051A1 (en) 2010-09-22
US8245791B2 (en) 2012-08-21
DE102009001590A1 (en) 2010-09-23
US20100236804A1 (en) 2010-09-23

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