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EP1637288A1 - Vibration damping electric hand tool - Google Patents

Vibration damping electric hand tool Download PDF

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Publication number
EP1637288A1
EP1637288A1 EP05108553A EP05108553A EP1637288A1 EP 1637288 A1 EP1637288 A1 EP 1637288A1 EP 05108553 A EP05108553 A EP 05108553A EP 05108553 A EP05108553 A EP 05108553A EP 1637288 A1 EP1637288 A1 EP 1637288A1
Authority
EP
European Patent Office
Prior art keywords
hand tool
electric hand
outer housing
rigid
elastic portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05108553A
Other languages
German (de)
French (fr)
Other versions
EP1637288B1 (en
Inventor
Helmut Burger
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.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP1637288A1 publication Critical patent/EP1637288A1/en
Application granted granted Critical
Publication of EP1637288B1 publication Critical patent/EP1637288B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B25F5/008—Cooling means
    • 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
    • B25D17/20—Devices for cleaning or cooling tool or work
    • 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
    • B25D17/24—Damping the reaction force
    • 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
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0057—Details related to cleaning or cooling the tool or workpiece
    • B25D2217/0061—Details related to cleaning or cooling the tool or workpiece related to cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B25D2222/57—Elastomers, e.g. rubber
    • 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
    • B25D2250/065—Details regarding assembling of the tool
    • 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
    • B25D2250/085—Elastic behaviour of tool components
    • 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
    • B25D2250/091—Electrically-powered tool components
    • B25D2250/095—Electric motors
    • 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 invention relates to an electric hand tool with an at least partially striking percussion in a percussion unit, which is vibration-damped in an outer housing, referred to in the preamble of claim 1.
  • a cooling fan for. B. sucked by the engine fan, cooling air via suction air openings in the outer housing of the electric hand tool, passed over the engine and the striking mechanism and then blown through outlet air openings in the outer housing. Labyrinths within the outer housing separate the intake area and the blow-out area.
  • a vibration-damped electric hand tool in which the percussion unit is movably mounted with the at least partially striking percussion mechanism within the outer housing, a complete sealing of the suction area of the discharge area with labyrinths is almost impossible. Due to the resulting air short circuit within the electric hand tool, the cooling performance deteriorates due to the preheated circulating air and the efficiency of the electric hand tool is reduced.
  • an electric hand tool with an at least partially impacting electro-pneumatic percussion mechanism in a striking mechanism assembly is known, which is capable of vibration-damping movement in an outer housing.
  • the outer housing has suction ventilation openings for a cooling fan and at least one cooling air line to the cooling fan is arranged on the striking mechanism assembly.
  • This electric hand tool has a good efficiency, since an air short circuit between the intake and the blow-out is largely prevented.
  • a disadvantage of the known solution is that a small proportion of the sucked cooling air circulate within the outer housing and moisture, z. B. when using the electric hand tool in the rain, can penetrate into the outer housing, which is not removed by the air flow again from the electrical appliance. The penetrating moisture can cause damage to the electrical system or electronics, for example.
  • the object of the invention is to provide an electric hand tool with a vibration-damped percussion unit, which has an optimal cooling air flow, so that an air short circuit between the intake and the blow-out avoided and the penetration of moisture in the outer casing is largely prevented.
  • the cooling air duct has at least one rigid section and one elastic section.
  • the at least one rigid section of the cooling air duct is arranged, for example, on the striking mechanism group, wherein the elastic section connects the suction air openings in the outer housing with the rigid section.
  • the suction area in which there is a negative pressure, from the blow-out area, in which pressure prevails, completely sealed.
  • no air short circuit can occur, with which the device has a much better efficiency and the cooling performance is improved, and on the other hand, penetrating moisture is completely removed from the air flow from the outer housing.
  • the dimensions, in particular the maximum longitudinal extension, and the formation of the elastic portion are chosen such that upon movement of the movable percussion group within the outer housing of up to 15 mm no tensile forces act on the elastic portion.
  • the exhaust air is advantageously blown by the fan from the engine in an optimally designed space without bottlenecks before it passes through the outlet air openings to the outside. Due to the targeted air flow in the blow-out area, sufficient heat is still dissipated from the percussion mechanism and the gearbox despite the cooling air preheated by the engine.
  • the rigid section of the cooling air duct is arranged in the region of the intake air openings on the outer housing, wherein the elastic section connects the rigid section with the striking mechanism group.
  • the cooling air line preferably has a first rigid section arranged on the outer housing and a second, rigid section arranged on the striking mechanism subassembly.
  • the elastic portion is disposed between the first and second rigid portions. This allows the arrangement of the elastic portion within a portion of the outer case in which there is a sufficiently large space for the elastic portion.
  • the elastic portion is formed as a bellows, whereby the elastic portion can optimally perform its function of balancing the movements of the percussion group and is designed to save space.
  • the elastic portion is formed, for example, as a sleeve.
  • the elastic portion is made of an elastomer.
  • the elastic portion is made of a suitable rubber.
  • FIGURE shows the inventive electric hand tool in a partial section.
  • the illustrated electric hand tool 1 has an at least partially striking, electro-pneumatic impact mechanism 2, which is integrated in a percussion group 3.
  • the percussion group 3 further comprises a motor 4 and a gear 5 and is mounted vibration-damped in the outer housing 6 movable.
  • a cooling air line 11 is arranged, which, starting from the intake air openings 7 in the outer housing 6 cooling air to the cooling fan 8, in the form of a fan, leads.
  • the cooling air duct 11 has a first, rigid section 12, which is arranged on the outer housing 6 in the region of the intake air openings 7, and a second, rigid section 13, which is arranged on the striking mechanism group 3.
  • the first rigid portion 12 is connected to the second rigid portion 13 via an elastic portion 14 in the form of a bellows made of an elastomer.
  • the air flow 21 of the cooling air generated by the cooling fan 8 is sucked through the suction air openings 7 in the outer housing 6 through the cooling air line 11, passed through the motor 4 and then past the gear 5 and the percussion mechanism 2 through the outlet air openings 9 in the outer housing 6 is blown out.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

The electric hand tool has a vibration-damped movable hammer in an outer housing (6) which has air intake openings (7) for the fan (8). The cool air pipe (11) has a rigid section (12, 13) and an elastic section (14). the elastic section can be folding bellows and/or made of elastomer.

Description

Technisches GebietTechnical area

Die Erfindung betrifft ein Elektrohandwerkzeug mit einem zumindest teilweise schlagenden Schlagwerk in einer Schlagwerksbaugruppe, die in einem Aussengehäuse vibrationsgedämpft beweglich ist, der im Oberbegriff des Patentanspruchs 1 genannten Art.The invention relates to an electric hand tool with an at least partially striking percussion in a percussion unit, which is vibration-damped in an outer housing, referred to in the preamble of claim 1. Art.

Stand der TechnikState of the art

Um im Betrieb eines Elektrohandwerkzeuges, wie ein Bohr-, Kombi- oder Meisselhammer, entstehende Wärme aus dem Motor sowie aus dem Schlagwerk abzuführen, wird über ein Kühlgebläse, z. B. einem von dem Motor angetriebenen Lüfter, Kühlluft über Ansaug-Luftöffnungen im Aussengehäuse des Elektrohandwerkzeuges angesaugt, über den Motor und das Schlagwerk geführt und anschliessend über Auslass-Luftöffnungen im Aussengehäuse ausgeblasen. Labyrinthe innerhalb des Aussengehäuses trennen den Ansaugbereich und den Ausblasbereich.In order to dissipate heat generated during operation of an electric hand tool, such as a drill, combi or chisel hammer, out of the engine and out of the percussion mechanism, a cooling fan, for. B. sucked by the engine fan, cooling air via suction air openings in the outer housing of the electric hand tool, passed over the engine and the striking mechanism and then blown through outlet air openings in the outer housing. Labyrinths within the outer housing separate the intake area and the blow-out area.

Bei einem vibrationsgedämpften Elektrohandwerkzeug, bei dem die Schlagwerksbaugruppe mit dem zumindest teilweise schlagenden Schlagwerk innerhalb des Aussengehäuses beweglich gelagert ist, ist eine vollständige Abdichtung des Ansaugbereichs von dem Ausblasbereich mit Labyrinthen nahezu unmöglich. Durch den somit entstehenden Luftkurzschluss innerhalb des Elektrohandwerkzeuges verschlechtert sich die Kühlleistung durch die vorgewärmte zirkulierende Luft und der Wirkungsgrad des Elektrohandwerkzeuges verringert sich.In a vibration-damped electric hand tool, in which the percussion unit is movably mounted with the at least partially striking percussion mechanism within the outer housing, a complete sealing of the suction area of the discharge area with labyrinths is almost impossible. Due to the resulting air short circuit within the electric hand tool, the cooling performance deteriorates due to the preheated circulating air and the efficiency of the electric hand tool is reduced.

Aus der EP 1 302 281 A1 ist ein Elektrohandwerkzeug mit einem zumindest teilweise schlagenden elektropneumatischen Schlagwerk in einer Schlagwerksbaugruppe bekannt, die in einem Aussengehäuse vibrationsgedämpft beweglich ist. Das Aussengehäuse weist Ansaug-Lüftöffnungen für ein Kühlgebläse auf und zumindest eine Kühlluftleitung zum Kühlgebläse ist an der Schlagwerksbaugruppe angeordnet. Dieses Elektrohandwerkzeug weist einen guten Wirkungsgrad auf, da ein Luftkurzschluss zwischen dem Ansaugbereich und dem Ausblasbereich weitgehend verhindert ist. Nachteilig an der bekannten Lösung ist, dass ein geringer Anteil der angesaugten Kühlluft innerhalb des Aussengehäuses zirkulieren und Feuchtigkeit, z. B. bei einem Einsatz des Elektrohandwerkzeuges im Regen, in das Aussengehäuse eindringen kann, welche durch den Luftstrom nicht wieder aus dem Elektrogerät abgeführt wird. Die eindringende Feuchtigkeit kann beispielsweise zu Schäden an der Elektrik oder Elektronik führen.From EP 1 302 281 A1, an electric hand tool with an at least partially impacting electro-pneumatic percussion mechanism in a striking mechanism assembly is known, which is capable of vibration-damping movement in an outer housing. The outer housing has suction ventilation openings for a cooling fan and at least one cooling air line to the cooling fan is arranged on the striking mechanism assembly. This electric hand tool has a good efficiency, since an air short circuit between the intake and the blow-out is largely prevented. A disadvantage of the known solution is that a small proportion of the sucked cooling air circulate within the outer housing and moisture, z. B. when using the electric hand tool in the rain, can penetrate into the outer housing, which is not removed by the air flow again from the electrical appliance. The penetrating moisture can cause damage to the electrical system or electronics, for example.

Darstellung der ErfindungPresentation of the invention

Aufgabe der Erfindung ist es, ein Elektrohandwerkzeug mit einer vibrationsgedämpften Schlagwerksbaugruppe zu schaffen, das eine optimale Kühlluftführung aufweist, so dass ein Luftkurzschluss zwischen dem Ansaugbereich und dem Ausblasbereich vermieden und das Eindringen von Feuchtigkeit in das Aussengehäuse weitgehend verhindert wird.The object of the invention is to provide an electric hand tool with a vibration-damped percussion unit, which has an optimal cooling air flow, so that an air short circuit between the intake and the blow-out avoided and the penetration of moisture in the outer casing is largely prevented.

Die Aufgabe ist durch die Merkmale des unabhängigen Anspruchs gelöst. Vorteilhafte Weiterbildungen sind in den Unteransprüchen dargelegt.The object is solved by the features of the independent claim. Advantageous developments are set forth in the subclaims.

Gemäss der Erfindung weist die Kühlluftleitung zumindest einen starren Abschnitt und einen elastischen Abschnitt auf.According to the invention, the cooling air duct has at least one rigid section and one elastic section.

Der zumindest eine starre Abschnitt der Kühlluftleitung ist beispielsweise an der Schlagwerkgruppe angeordnet, wobei der elastische Abschnitt die Ansaug-Luftöffnungen im Aussengehäuse mit dem starren Abschnitt verbindet. Damit ist der Ansaugbereich, in dem Unterdruck herrscht, vom Ausblasbereich, in dem Überdruck herrscht, vollständig abgedichtet. Einerseits kann kein Luftkurzschluss entstehen, womit das Gerät einen wesentlich besseren Wirkungsgrad aufweist und die Kühlleistung verbessert ist, und andererseits wird eindringende Feuchtigkeit von dem Luftstrom vollständig aus dem Aussengehäuse entfernt. Die Abmessungen, insbesondere die maximale Längserstreckung, und die Ausbildung des elastischen Abschnitts sind derart gewählt, dass bei einer Bewegung der beweglichen Schlagwerkgruppe innerhalb des Aussengehäuses von bis zu 15 mm keine Zugkräfte auf den elastischen Abschnitt wirken. Die Abluft wird vorteilhaft durch den Lüfter aus dem Motor in einen optimal ausgebildeten Raum ohne Engpässe geblasen, bevor sie durch die Auslass-Luftöffnungen nach aussen gelangt. Durch die gezielte Luftführung im Ausblasbereich wird trotz der von dem Motor vorgewärmten Kühlluft noch ausreichend Wärme aus dem Schlagwerk und dem Getriebe abgeleitet. In einer alternativen Ausführung ist der starre Abschnitt der Kühlluftleitung im Bereich der Ansaug-Luftöffnungen am Aussengehäuse angeordnet, wobei der elastische Abschnitt den starren Abschnitt mit der Schlagwerkgruppe verbindet.The at least one rigid section of the cooling air duct is arranged, for example, on the striking mechanism group, wherein the elastic section connects the suction air openings in the outer housing with the rigid section. Thus, the suction area, in which there is a negative pressure, from the blow-out area, in which pressure prevails, completely sealed. On the one hand, no air short circuit can occur, with which the device has a much better efficiency and the cooling performance is improved, and on the other hand, penetrating moisture is completely removed from the air flow from the outer housing. The dimensions, in particular the maximum longitudinal extension, and the formation of the elastic portion are chosen such that upon movement of the movable percussion group within the outer housing of up to 15 mm no tensile forces act on the elastic portion. The exhaust air is advantageously blown by the fan from the engine in an optimally designed space without bottlenecks before it passes through the outlet air openings to the outside. Due to the targeted air flow in the blow-out area, sufficient heat is still dissipated from the percussion mechanism and the gearbox despite the cooling air preheated by the engine. In an alternative embodiment, the rigid section of the cooling air duct is arranged in the region of the intake air openings on the outer housing, wherein the elastic section connects the rigid section with the striking mechanism group.

Bevorzugt weist die Kühlluftleitung einen ersten starren, am Aussengehäuse angeordneten Abschnitt und einen zweiten starren, an der Schlagwerksbaugruppe angeordneten Abschnitt auf. Der elastische Abschnitt ist zwischen dem ersten und dem zweiten starren Abschnitt angeordnet. Dies ermöglicht die Anordnung des elastischen Abschnitts innerhalb eines Bereichs des Aussengehäuses, in dem ein ausreichend grosser Raum für den elastischen Abschnitt vorhanden ist.The cooling air line preferably has a first rigid section arranged on the outer housing and a second, rigid section arranged on the striking mechanism subassembly. The elastic portion is disposed between the first and second rigid portions. This allows the arrangement of the elastic portion within a portion of the outer case in which there is a sufficiently large space for the elastic portion.

Vorzugsweise ist der elastische Abschnitt als Faltenbalg ausgebildet, womit der elastische Abschnitt seine Funktion des Ausgleichs der Bewegungen der Schlagwerkgruppe optimal wahrnehmen kann und platzsparend ausgebildet ist. Alternativ ist der elastische Abschnitt beispielsweise als eine Hülse ausgebildet.Preferably, the elastic portion is formed as a bellows, whereby the elastic portion can optimally perform its function of balancing the movements of the percussion group and is designed to save space. Alternatively, the elastic portion is formed, for example, as a sleeve.

Bevorzugt ist der elastische Abschnitt aus einem Elastomer gefertigt. Vorteilhaft wird der elastische Abschnitt aus einem geeigneten Gummi hergestellt.Preferably, the elastic portion is made of an elastomer. Advantageously, the elastic portion is made of a suitable rubber.

Aus der nachfolgenden Detailbeschreibung und der Gesamtheit der Patentansprüche ergeben sich weitere vorteilhafte Ausführungsformen und Merkmalskombinationen der Erfindung.From the following detailed description and the totality of the claims, further advantageous embodiments and feature combinations of the invention result.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles näher erläutert. Die einzige Figur zeigt das erfindungsgemässe Elektrohandwerkzeug in einem Teilschnitt.The invention will be explained in more detail below with reference to an embodiment. The single FIGURE shows the inventive electric hand tool in a partial section.

Wege zur Ausführung der ErfindungWays to carry out the invention

Das dargestellte Elektrohandwerkzeug 1 weist ein zumindest teilweise schlagendes, elektropneumatisches Schlagwerk 2 auf, das in einer Schlagwerkgruppe 3 integriert ist. Die Schlagwerkgruppe 3 umfasst weiter einen Motor 4 und ein Getriebe 5 und ist in dem Aussengehäuse 6 vibrationsgedämpft beweglich gelagert. An der Schlagwerkgruppe 3 ist eine Kühlluftleitung 11 angeordnet, die ausgehend von den Ansaug-Luftöffnungen 7 in dem Aussengehäuse 6 Kühlluft zum Kühlgebläse 8, in Form eines Lüfters, führt.The illustrated electric hand tool 1 has an at least partially striking, electro-pneumatic impact mechanism 2, which is integrated in a percussion group 3. The percussion group 3 further comprises a motor 4 and a gear 5 and is mounted vibration-damped in the outer housing 6 movable. At the percussion group 3, a cooling air line 11 is arranged, which, starting from the intake air openings 7 in the outer housing 6 cooling air to the cooling fan 8, in the form of a fan, leads.

Die Kühlluftleitung 11 weist einen ersten, starren Abschnitt 12, der im Bereich der Ansaug-Luftöffnungen 7 an dem Aussengehäuse 6 angeordnet ist, und einen zweiten, starren Abschnitt 13 auf, der an der Schlagwerkgruppe 3 angeordnet ist. Der erste, starre Abschnitt 12 ist über einen elastischen Abschnitt 14, in Form eines Faltenbalgs aus einem Elastomer, mit dem zweiten, starren Abschnitt 13 verbunden.The cooling air duct 11 has a first, rigid section 12, which is arranged on the outer housing 6 in the region of the intake air openings 7, and a second, rigid section 13, which is arranged on the striking mechanism group 3. The first rigid portion 12 is connected to the second rigid portion 13 via an elastic portion 14 in the form of a bellows made of an elastomer.

Der von dem Kühlgebläse 8 erzeugte Luftstrom 21 der Kühlluft wird durch die Ansaug-Luftöffnungen 7 in dem Aussengehäuse 6 durch die Kühlluftleitung 11 angesaugt, über den Motor 4 geführt und anschliessend an dem Getriebe 5 sowie dem Schlagwerk 2 vorbei durch die Auslass-Luftöffnungen 9 in dem Aussengehäuse 6 ausgeblasen wird.The air flow 21 of the cooling air generated by the cooling fan 8 is sucked through the suction air openings 7 in the outer housing 6 through the cooling air line 11, passed through the motor 4 and then past the gear 5 and the percussion mechanism 2 through the outlet air openings 9 in the outer housing 6 is blown out.

Claims (4)

Elektrohandwerkzeug (1) mit einem zumindest teilweise schlagenden Schlagwerk (2) in einer Schlagwerksbaugruppe (3), die in einem Aussengehäuse (6) vibrationsgedämpft beweglich ist, wobei das Aussengehäuse (6) Ansaug-Lüftöffnungen (7) für ein Kühlgebläse (8) aufweist und zumindest eine Kühlluftleitung (11) zum Kühlgebläse (8) an der Schlagwerksbaugruppe (3) angeordnet ist, dadurch gekennzeichnet, dass die Kühlluftleitung (11) zumindest einen starren Abschnitt (12, 13) und einen elastischen Abschnitt (14) aufweist.Electric hand tool (1) with an at least partially striking striking mechanism (2) in a striking mechanism assembly (3) which is vibration dampened movable in an outer housing (6), wherein the outer housing (6) suction ventilation openings (7) for a cooling fan (8) and at least one cooling air duct (11) to the cooling fan (8) is arranged on the striking mechanism assembly (3), characterized in that the cooling air duct (11) has at least one rigid portion (12, 13) and one elastic portion (14). Elektrohandwerkzeug nach Anspruch 1, dadurch gekennzeichnet, dass die Kühlluftleitung (11) einen ersten starren, am Aussengehäuse (6) angeordneten Abschnitt (12) und einen zweiten starren, an der Schlagwerksbaugruppe (3) angeordneten Abschnitt (13) aufweist, wobei der elastische Abschnitt (14) zwischen dem ersten und dem zweiten starren Abschnitt (12, 13) angeordnet ist.Electric hand tool according to claim 1, characterized in that the cooling air line (11) has a first rigid, on the outer housing (6) arranged portion (12) and a second rigid, on the percussion mechanism assembly (3) arranged portion (13), wherein the elastic portion (14) between the first and the second rigid portion (12, 13) is arranged. Elektrohandwerkzeug nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der elastische Abschnitt (14) als Faltenbalg ausgebildet ist.Electric hand tool according to claim 1 or 2, characterized in that the elastic portion (14) is designed as a bellows. Elektrohandwerkzeug nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der elastische Abschnitt (14) aus einem Elastomer gefertigt ist.Electric hand tool according to one of claims 1 to 3, characterized in that the elastic portion (14) is made of an elastomer.
EP20050108553 2004-09-16 2005-09-16 Vibration damping electric hand tool Active EP1637288B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004044822 2004-09-16

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EP1637288A1 true EP1637288A1 (en) 2006-03-22
EP1637288B1 EP1637288B1 (en) 2014-08-13

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
DE102006038756A1 (en) * 2006-08-17 2008-02-21 Marquardt Gmbh Power tool e.g. drilling machine, has fixed and/or flexible air channel, which is arranged in housing and directs air flow and/or distributing air flow to cool heat source, where one end of air channel is turned towards fan wheel
EP1958735A1 (en) * 2007-02-15 2008-08-20 HILTI Aktiengesellschaft Hand tool device
DE102007043916A1 (en) * 2007-09-14 2009-04-02 Robert Bosch Gmbh Electric manual machine tool, particularly percussion drill machine, has air guidance ring that leads to portion of air flow of functional module or air guidance ring section, is arranged at extent of electric motor
EP2105261A1 (en) * 2008-03-27 2009-09-30 AEG Electric Tools GmbH Electric tool, in particular hammer drill and/or chipping hammer
EP2251152A1 (en) * 2009-05-11 2010-11-17 Robert Bosch GmbH Handheld power tool, in particular electric hand tool
EP2404708A3 (en) * 2010-06-15 2013-01-16 HILTI Aktiengesellschaft Manually operated fastening device
EP2653024A1 (en) * 2012-04-16 2013-10-23 Andreas Stihl AG & Co. KG Work device
EP2149432A3 (en) * 2008-07-30 2014-07-02 Hitachi Koki CO., LTD. Power tool
EP2923801A1 (en) * 2014-03-24 2015-09-30 Makita Corporation Impact tool
EP4037161A1 (en) * 2021-02-02 2022-08-03 Andreas Stihl AG & Co. KG Hand-held shaft work apparatus
EP4282595A1 (en) 2022-05-23 2023-11-29 Black & Decker, Inc. Power tool

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EP3697574A1 (en) 2017-10-20 2020-08-26 Milwaukee Electric Tool Corporation Percussion tool
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EP4400263A1 (en) 2023-01-11 2024-07-17 Hilti Aktiengesellschaft Electric hand tool
EP4400264A1 (en) 2023-01-12 2024-07-17 Hilti Aktiengesellschaft Electric hand tool

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US8443912B2 (en) 2007-02-15 2013-05-21 Hilti Aktiengesellschaft Hand-held power tool
DE102007043916A1 (en) * 2007-09-14 2009-04-02 Robert Bosch Gmbh Electric manual machine tool, particularly percussion drill machine, has air guidance ring that leads to portion of air flow of functional module or air guidance ring section, is arranged at extent of electric motor
EP2105261A1 (en) * 2008-03-27 2009-09-30 AEG Electric Tools GmbH Electric tool, in particular hammer drill and/or chipping hammer
EP2149432A3 (en) * 2008-07-30 2014-07-02 Hitachi Koki CO., LTD. Power tool
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CN103372854A (en) * 2012-04-16 2013-10-30 安德烈亚斯.斯蒂尔两合公司 Work device
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EP4037161A1 (en) * 2021-02-02 2022-08-03 Andreas Stihl AG & Co. KG Hand-held shaft work apparatus
EP4282595A1 (en) 2022-05-23 2023-11-29 Black & Decker, Inc. Power tool

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