EP1787761A1 - Motor-driven hammer drill - Google Patents

Motor-driven hammer drill Download PDF

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Publication number
EP1787761A1
EP1787761A1 EP05024979A EP05024979A EP1787761A1 EP 1787761 A1 EP1787761 A1 EP 1787761A1 EP 05024979 A EP05024979 A EP 05024979A EP 05024979 A EP05024979 A EP 05024979A EP 1787761 A1 EP1787761 A1 EP 1787761A1
Authority
EP
European Patent Office
Prior art keywords
elastomeric material
hammer drill
drill sleeve
hammer
sleeve
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
EP05024979A
Other languages
German (de)
French (fr)
Other versions
EP1787761B1 (en
Inventor
Michael Keller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metabowerke GmbH and Co
Original Assignee
Metabowerke GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Priority to DE502005008837T priority Critical patent/DE502005008837D1/en
Priority to EP05024979A priority patent/EP1787761B1/en
Priority to AT05024979T priority patent/ATE454248T1/en
Priority to US11/594,207 priority patent/US20070107920A1/en
Priority to CN2006101464206A priority patent/CN101181784B/en
Publication of EP1787761A1 publication Critical patent/EP1787761A1/en
Application granted granted Critical
Publication of EP1787761B1 publication Critical patent/EP1787761B1/en
Not-in-force 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
    • 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
    • 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
    • B25D2217/0092—Arrangements for damping of the reaction force by use of counterweights being spring-mounted
    • 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

Definitions

  • the absorber mass is formed substantially cylindrical. This allows a symmetrical and in the circumferential direction evenly distributed mass distribution around the drill sleeve to be achieved, which proves to be useful in terms of vibration damping.
  • the axial extension of the absorber mass may advantageously also be 5 to 20 mm. It is advantageously 3 to 8 times their wall thickness.

Abstract

The drilling hammer has a percussion and rotary drive disposed in a housing. A drill sleeve (14) is disposed in the housing and cooperates with the percussion and rotary drive, and with a tool or chuck for receiving the tool. A spring (32) connected to an outer periphery of the drill sleeve has an elastomeric material (34) with a wall thickness of 1-10 millimeter. A damping mass is held by the spring for deflection of the damping mass relative to the drill sleeve in a peripheral and longitudinal direction of the drill sleeve due to an elasticity of the spring.

Description

Die Erfindung betrifft einen motorisch angetriebenen Bohrhammer mit Schlag- und Drehantrieb und mit einer in einem Gehäuse gelagerten Bohrhülse.The invention relates to a motor-driven rotary hammer with impact and rotary drive and with a mounted in a housing sleeve.

Bei Bohrhämmern besteht aufgrund des Schlagantriebs stets das Problem, dass heftige Vibrationen ausgehend vom Schlagwerk auf Gehäuse- und Griffkomponenten übertragen werden. Es wurde bereits der Vorschlag unterbreitet, ein Feder/Masse-System bei einem Abbruchhammer vorzusehen, wobei durch den axial wirkenden Schlagantrieb entstehende Schwingungen durch eine beidseits federvorgespannte Masse gedämpft werden sollen.In the case of rotary hammers, there is always the problem due to the impact drive that heavy vibrations are transmitted from the percussion mechanism to housing components and handle components. It has already been proposed to provide a spring / mass system in a demolition hammer, which are to be attenuated by the axially acting impact drive oscillations by a two-sided spring-biased mass.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine effektive Vibrationsminderung bei Bohrhämmern zu schaffen.The present invention has for its object to provide an effective vibration reduction in rotary hammers.

Diese Aufgabe wird bei einem Bohrhammer der eingangs genannten Art erfindungsgemäß dadurch gelöst, dass die Bohrhülse an ihrem Außenumfang mit einem Federmittel aus einem elastomeren Material verbunden ist, das eine Wandstärke von 1 - 10 mm aufweist, und dass das Federmittel eine Tilgermasse hat, die in Folge der Elastizität des Federmittels in Umfangsrichtung und in Längsrichtung der Bohrhülse gegenüber dieser auslenkbar ist und so eine Dämpfung zur Vibrationsminderung bewirken kann.This object is achieved according to the invention in a hammer drill of the type mentioned above, that the drill sleeve is connected at its outer periphery with a spring means of an elastomeric material having a wall thickness of 1 - 10 mm, and that the spring means has an absorber mass which in Consequence of the elasticity of the spring means in the circumferential direction and in the longitudinal direction of the drill sleeve relative to this is deflected and can cause a damping to reduce vibration.

Bei dem erfindungsgemäßen Bohrhammer kann die Tilgermasse sowohl in translatorischer als auch in rotatorischer Richtung schwingen. Das Feder/Masse-System wird dabei so ausgelegt, dass die Schwingung der Tilgermasse in translatorischer und rotatorischer Richtung jeweils gegenphasig zu den Schwingungen der Bohrhülse erfolgt, so dass diese Schwingfrequenzen getilgt bzw. wirksam gedämpft werden. Auf diese Weise wird die Gesamtschwingungserregung des Bohrhammers um diese zwei Hauptkomponenten reduziert. Es wurde gerade bei kleinen und mittleren Bohrhämmern nämlich erfindungsgemäß festgestellt, dass die Griffvibrationen primär durch die auf das Werkzeug ausgeübten Schlag- und Drehkräfte erzeugt werden. Da die Schlag- und Drehzahl bei Bohrhämmern im Betrieb jedoch weitgehend konstant bleibt, kann in vorteilhafter Weise eine Schwingungstilgung zur Vibrationsminderung angewandt werden. Durch die erfindungsgemäße Ausbildung ist eine sehr wirksame Vibrationsminderung erreichbar, da sowohl translatorische als auch rotatorische Schwingungen gedämpft werden können.In the hammer drill according to the invention, the absorber mass can oscillate both in a translatory and in a rotational direction. The spring / mass system is designed so that the oscillation of the absorber mass in translational and rotational direction in each case takes place in phase opposition to the vibrations of the drill sleeve, so that these frequencies are eradicated or effectively damped. In this way, the overall vibration excitation of the hammer drill is reduced by these two main components. It has been found according to the invention, especially in small and medium hammer drills, that the grip vibrations are generated primarily by the impact and rotational forces exerted on the tool. However, since the impact and speed of rotary hammers during operation remains largely constant, a vibration damping can be used to reduce vibration advantageously. The inventive construction a very effective vibration reduction can be achieved because both translational and rotational vibrations can be damped.

Durch die erfindungsgemäße Anordnung der Tilgermasse können durch eine einzige Masse wenigstens zwei dominierende Erregerfrequenzen getilgt werden. Die Auslegung des Feder/Masse-Systems ist abhängig von der Geometrie und dem Betrag der Tilgermasse und der Geometrie und Ausbildung des Federmittels aus elastomerem Material. Wenn beispielsweise die Tilgerfrequenz vermindert werden soll, so ist es denkbar, die elastomere Masse dicker auszubilden oder den Betrag der Tilgermasse zu erhöhen. Dies muss jeweils durch geeignete Auslegung des Feder/Masse-Systems entsprechend der zu tilgenden Frequenzen, die im Betrieb des Bohrhammers auftreten, ausgelegt werden.The inventive arrangement of the absorber mass can be eradicated by a single mass at least two dominant exciter frequencies. The interpretation of the Spring / mass system is dependent on the geometry and the amount of the absorber mass and the geometry and design of the spring means of elastomeric material. For example, if the Tilgerfrequenz to be reduced, it is conceivable to make the elastomeric mass thicker or to increase the amount of absorber mass. This must be designed in each case by suitable design of the spring / mass system according to the frequencies to be canceled, which occur during operation of the hammer drill.

Es kann sich als vorteilhaft erweisen, wenn das elastomere Material die Bohrhülse in Umfangsrichtung durchgehend umgibt und im Wesentlichen zylindrisch ausgebildet ist. Solchenfalls lässt sich eine sehr beanspruchbare Anbindung der Tilgermasse an die Bohrhülse erreichen, die auch weitgehend unempfindlich im Hinblick auf Scherbeanspruchung ist. Es kann sich aber für bestimmte Fälle auch als vorteilhaft erweisen, wenn das elastomere Material segmentiert ist, wenn also beispielsweise mehrere aneinander angrenzende oder voneinander beabstandete Segmente aus elastomerem Material am Außenumfang der Bohrhülse vorgesehen sind oder wenn das elastomere Material in radialer, tangentialer oder axialer Richtung erstreckte Durchbrechungen, Ausnehmungen oder Öffnungen aufweist.It may prove advantageous if the elastomeric material surrounds the drill sleeve in the circumferential direction continuously and is substantially cylindrical. In this case, a very durable connection of the absorber mass to the drill sleeve can be achieved, which is also largely insensitive with regard to shear stress. However, it may also prove advantageous in certain cases when the elastomeric material is segmented, ie when, for example, a plurality of adjoining or spaced segments of elastomeric material are provided on the outer circumference of the drill sleeve or if the elastomeric material is in the radial, tangential or axial direction has extended openings, recesses or openings.

Für Anwendungen bei kleinen und mittleren Bohrhämmern hat es sich als vorteilhaft erwiesen, wenn das elastomere Material eine Wandstärke von 4 bis 8 mm aufweist. Weiter wird eine Ausführungsform bevorzugt, bei der das elastomere Material eine axiale Erstreckung in Längsrichtung der Bohrhülse von 5 bis 20 mm aufweist.For applications in small and medium rotary hammers, it has proven to be advantageous if the elastomeric material has a wall thickness of 4 to 8 mm. Furthermore, an embodiment is preferred in which the elastomeric material has an axial extent in the longitudinal direction of the drill sleeve of 5 to 20 mm.

Weiter erweist es sich als vorteilhaft, wenn die Tilgermasse im Wesentlichen zylindrisch ausgebildet ist. Hierdurch kann eine symmetrische und in Umfangsrichtung gleichmäßig durchgehende Massenverteilung um die Bohrhülse herum erreicht werden, die sich im Hinblick auf die Schwingungstilgung als zweckmäßig erweist. Die axiale Erstreckung der Tilgermasse kann in vorteilhafter Weise ebenfalls 5 bis 20 mm betragen. Sie beträgt vorteilhafterweise das 3- bis 8-Fache ihrer Wandstärke.Furthermore, it proves to be advantageous if the absorber mass is formed substantially cylindrical. This allows a symmetrical and in the circumferential direction evenly distributed mass distribution around the drill sleeve to be achieved, which proves to be useful in terms of vibration damping. The axial extension of the absorber mass may advantageously also be 5 to 20 mm. It is advantageously 3 to 8 times their wall thickness.

Es erweist sich als vorteilhaft, wenn das Tilgermasse/Feder-System so ausgelegt ist, dass Schwingungen zwischen 30 und 100 Hz gedämpft werden. Bei kleineren Bohrhämmern liegen die zu tilgenden Schwingungen vornehmlich zwischen 70 und 80 Hz.It proves to be advantageous if the absorber mass / spring system is designed so that vibrations between 30 and 100 Hz are attenuated. For smaller rotary hammers, the vibrations to be settled are predominantly between 70 and 80 Hz.

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

Figur 1
eine Schnittansicht eines hier interessierenden Bereichs eines Bohrhammers; und
Figur 2
eine perspektivische Ansicht des Bohrhammers nach Figur 1, jedoch mit dargestelltem Drehantrieb der Bohrhülse.
Further features, details and advantages of the invention will become apparent from the appended claims and from the drawings and the following description of a preferred embodiment of the hammer drill according to the invention. In the drawing shows:
FIG. 1
a sectional view of a region of interest here a hammer drill; and
FIG. 2
a perspective view of the hammer drill of Figure 1, but with illustrated rotary drive of the drill sleeve.

Die Figuren zeigen einen die Antriebskomponenten eines erfindungsgemäßen Bohrhammers umfassenden Bereich 2. Ein den Elektromotor aufweisender Bereich sowie einen Griffbereich des Bohrhammers ist nicht dargestellt. Eine Hauptantriebswelle erstreckt sich durch die angedeutete Drehdurchführung 4 in den Bereich 2 und treibt (in nicht dargestellter Weise) eine Welle 6 an. Die Welle 6 trägt eine Taumelscheibenanordnung 8 (am besten aus Figur 2 ersichtlich), die ein Schlagwerk 10 des Bohrhammers antreibt, und ein Zahnrad 12 (nur aus Figur 2 ersichtlich), welches einen Drehantrieb für eine Bohrhülse 14 bewirkt.The figures show an area encompassing the drive components of a hammer drill according to the invention. A region comprising the electric motor and a grip region of the hammer drill are not shown. A main drive shaft extends through the indicated rotary feedthrough 4 in the area 2 and drives (in a manner not shown) to a shaft 6 at. The shaft 6 carries a swash plate assembly 8 (best seen in Figure 2), the hammer mechanism 10 of the hammer drill drives, and a gear 12 (only seen in Figure 2), which causes a rotary drive for a drill sleeve 14.

Das Schlagwerk 10 umfasst eine einen Zylinderraum 16 begrenzende Hülse 18, die von der Taumelscheibenanordnung 8 in Längsrichtung 20 der Bohrhülse 14, also axial hin- und herbewegbar ist. Die Hülse 18 ist innerhalb der Bohrhülse 14 und konzentrisch zu dieser sowie gegenüber dieser axial beweglich angeordnet. Innerhalb des Zylinderraums 1-6 ist ein Freiflugkörper als Schläger 22 vorgesehen, der zusammen mit der Hülse 18 eine Luftfeder 24 ausbildet. Wenn die Hülse 18 durch die Taumelscheibenanordnung 8 in der Figur 1 nach links beschleunigt wird, so verbleibt der Schläger 22 aufgrund seiner Massenträgheit zunächst in seiner Position. Auf diese Weise bildet sich innerhalb des Zylinderraums 16 ein Unterdruck aus, welcher den Schläger 22 verzögert beschleunigt. Wenn die Hülse 18 dann wieder in der Figur 1 nach rechts bewegt wird, so wird der Zylinderraum und die darin enthaltene Luft komprimiert, und zwar auf insbesondere 10 bis 20 bar, was dann eine starke Beschleunigung des Schlägers 22 nach rechts in Richtung auf einen Zwischenkolben 26 zur Folge hat. Der Schläger 22 trifft mit einer dem Zwischenkolben 26 zugewandten Schlagfläche 28 auf den Zwischenkolben 26 und wird dadurch schlagartig zum Stillstand gebracht, wobei der Impuls auf den Zwischenkolben 26 übertragen wird, der dann auf ein Werkzeug, einen Bohrer oder Meißel, auftrifft und dort eine weitere Impulsübergabe ausführt (Schlag- oder Hammerbetrieb). Wenn der Zwischenkolben 26 in der Figur 1 nach links zurückschnellt, so trifft er unter Vermittlung eines Elastomerrings 30 auf die Bohrhülse 14 und erzeugt so Vibrationen, die sich auf das Gehäuse des Geräts übertragen und vom Benutzer als unangenehm empfunden werden.The percussion mechanism 10 comprises a sleeve chamber 18 delimiting a cylinder chamber 16 which can be moved axially back and forth by the swash plate arrangement 8 in the longitudinal direction 20 of the drill sleeve 14. The sleeve 18 is disposed within the drill sleeve 14 and concentrically to this and axially movable relative to this. Within the cylinder chamber 1-6 a free-flying body is provided as a racket 22, which forms an air spring 24 together with the sleeve 18. When the sleeve 18 is accelerated to the left by the swash plate arrangement 8 in FIG. 1, the racket 22 initially remains in its position due to its inertia. In this way, a negative pressure forms within the cylinder chamber 16, which accelerates the racket 22 delayed. When the sleeve 18 is then moved back to the right in Figure 1, the cylinder space and the air contained therein is compressed, in particular 10 to 20 bar, which then a strong acceleration of the racket 22 to the right in the direction of an intermediate piston 26 results. The racket 22 strikes the intermediate piston 26 with a striking surface 28 facing the intermediate piston 26 and is thereby abruptly brought to a standstill, the pulse being transmitted to the intermediate piston 26, which then impinges on a tool, a drill or a chisel and there another Pulse transfer executes (impact or hammer operation). When the intermediate piston 26 snaps back to the left in FIG. 1, it encounters the drill sleeve 14 through the intermediary of an elastomeric ring 30 and thus generates vibrations which are transmitted to the housing of the device and are perceived as unpleasant by the user.

Am Außenumfang 31 der Bohrhülse 14 ist ein Federmittel 32 aus einem elastomeren Material 34 vorgesehen. Das Federmittel 32 bzw. das elastomere Material 34 umgibt den Außenumfang 30 der Bohrhülse 15 im dargestellten beispielhaften Fall in Umfangsrichtung durchgehend; es ist im Wesentlichen zylindrisch ausgebildet und weist eine Wandstärke von 1 bis 10, insbesondere von 4 bis 8 mm auf. Das elastomere Material 34 trägt radial außen und im dargestellten Fall konzentrisch zur Bohrhülse 14 eine Tilgermasse 36 ebenfalls zylindrischer Grundgeometrie. Die Tilgermasse 36 ist über das Federmittel 32 aus elastomerem Material nicht nur in axialer Längsrichtung 20, sondern auch in Umfangsrichtung nachgiebig bezüglich der Bohrhülse 14 auslenkbar. Grundsätzlich stehen durch die Anbindung der Tilgermasse 36 an die Bohrhülse 14 durch das elastomere Material 34 sechs Freiheitsgrade zur Verfügung. Das Tilgermasse/Feder-System ist so ausgelegt, dass durch die nachgiebig auslenkbare Anordnung der Tilgermasse 36 diese Tilgermasse in translatorischer und rotatorischer Richtung jeweils gegenphasig zu den Erregerschwingungen, die auf die Bohrhülse wirken, schwingen kann, so dass hierdurch Schwingungen gedämpft bzw. getilgt werden können, was eine effektive Vibrationsminderung darstellt. Die Gesamtschwingungserregung des Bohrhammers kann so um zwei Hauptkomponenten reduziert werden.On the outer circumference 31 of the drill sleeve 14, a spring means 32 of an elastomeric material 34 is provided. The spring means 32 and the elastomeric material 34 surrounds the outer periphery 30 of the drill sleeve 15 in the illustrated exemplary case in the circumferential direction continuously; it is substantially cylindrical and has a wall thickness of 1 to 10, in particular from 4 to 8 mm. The elastomeric material 34 carries radially outside and in the illustrated case concentric with the drill sleeve 14 a damping mass 36 also cylindrical basic geometry. The absorber mass 36 is deflectable via the spring means 32 of elastomeric material not only in the axial longitudinal direction 20, but also in the circumferential direction with respect to the drill sleeve 14. In principle, six degrees of freedom are available through the connection of the absorber mass 36 to the drill sleeve 14 through the elastomeric material 34. The Tilgermasse / spring system is designed so that this absorber mass in translational and rotational direction in each case in phase opposition to the excitation vibrations acting on the drill sleeve can swing through the yielding deflectable arrangement of the absorber mass, so that thereby vibrations dampened or eradicated what is an effective vibration reduction. The total vibration excitation of the hammer drill can thus be reduced by two main components.

Claims (10)

Motorisch angetriebener Bohrhammer mit Schlag- und Drehantrieb und mit einer in einem Gehäuse gelagerten Bohrhülse (14), die mit einem Werkzeug oder einem Futter zur Aufnahme des Werkzeugs in Antriebsverbindung steht, dadurch gekennzeichnet, dass die Bohrhülse (14) an ihrem Außenumfang (30) mit einem Federmittel (32) aus einem elastomeren Material (34) verbunden ist, das eine Wandstärke von 1 - 10 mm aufweist, und dass das Federmittel (32) eine Tilgermasse (36) hält, die in Folge der Elastizität des Federmittels (32) in Umfangsrichtung und in Längsrichtung (20) der Bohrhülse (14) gegenüber dieser auslenkbar ist und so eine Dämpfung zur Vibrationsminderung bewirken kann.Motor-driven rotary hammer with impact and rotary drive and with a housing mounted in a drill sleeve (14) which is in drive connection with a tool or a chuck for receiving the tool, characterized in that the drill sleeve (14) on its outer periphery (30) is connected to a spring means (32) made of an elastomeric material (34) having a wall thickness of 1-10 mm, and in that the spring means (32) holds an absorber mass (36) resulting from the elasticity of the spring means (32) in the circumferential direction and in the longitudinal direction (20) of the drill sleeve (14) relative to this is deflectable and can cause a damping to reduce vibration. Bohrhammer nach Anspruch 1, dadurch gekennzeichnet, dass das elastomere Material (34) die Bohrhülse (14) in Umfangsrichtung durchgehend umgibt und im wesentlichen zylindrisch ausgebildet ist.Hammer drill according to claim 1, characterized in that the elastomeric material (34) surrounding the drill sleeve (14) in the circumferential direction and is substantially cylindrical. Bohrhammer nach Anspruch 1, dadurch gekennzeichnet, dass das elastomere Material segmentiert ist.Hammer drill according to claim 1, characterized in that the elastomeric material is segmented. Bohrhammer nach Anspruch 1, dadurch gekennzeichnet, dass elastomere Material in radialer, tangentialer oder axialer Richtung erstreckte Durchbrechungen, Ausnehmungen oder Öffnungen aufweist.Hammer drill according to claim 1, characterized in that elastomeric material in the radial, tangential or axial direction extending openings, recesses or openings. Bohrhammer nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das elastomere Material (34) eine Wandstärke von 4 - 8 mm aufweist.Hammer drill according to one of the preceding claims, characterized in that the elastomeric material (34) has a wall thickness of 4 - 8 mm. Bohrhammer nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das elastomere Material (34) eine axiale Erstreckung in Längsrichtung (20) der Bohrhülse (14) von 5 - 20 mm aufweist.Hammer drill according to one of the preceding claims, characterized in that the elastomeric material (34) has an axial extent in the longitudinal direction (20) of the drill sleeve (14) of 5 - 20 mm. Bohrhammer nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, das die Tilgermasse (36) im wesentlichen zylindrisch ausgebildet ist.Hammer drill according to one of the preceding claims, characterized in that the absorber mass (36) is formed substantially cylindrical. Bohrhammer nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Tilgermasse (36) eine axiale Erstreckung in Längsrichtung (20) der Bohrhülse (14) aufweist, die 5 - 20 mm beträgt.Hammer drill according to one of the preceding claims, characterized in that the absorber mass (36) has an axial extension in the longitudinal direction (20) of the drill sleeve (14), which is 5 - 20 mm. Bohrhammer nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Tilgermasse (36) eine axiale Erstreckung in Längsrichtung (20) der Bohrhülse (14) aufweist, die das 3 bis 8-fache ihrer Wandstärke beträgt.Hammer drill according to one of the preceding claims, characterized in that the absorber mass (36) has an axial extension in the longitudinal direction (20) of the drill sleeve (14), which is 3 to 8 times its wall thickness. Bohrhammer nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Tilgermasse/Feder-System so ausgelegt ist, dass Schwingungen zwischen 30 und 100 Hz gedämpft werden. 70-80 bei kleinen Bohrhämmern.Hammer drill according to one of the preceding claims, characterized in that the absorber mass / spring system is designed so that vibrations between 30 and 100 Hz are damped. 70-80 for small rotary hammers.
EP05024979A 2005-11-16 2005-11-16 Motor-driven hammer drill Not-in-force EP1787761B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE502005008837T DE502005008837D1 (en) 2005-11-16 2005-11-16 Motor driven hammer drill
EP05024979A EP1787761B1 (en) 2005-11-16 2005-11-16 Motor-driven hammer drill
AT05024979T ATE454248T1 (en) 2005-11-16 2005-11-16 MOTOR DRIVEN HAMMER DRILL
US11/594,207 US20070107920A1 (en) 2005-11-16 2006-11-08 Motor driven drilling hammer
CN2006101464206A CN101181784B (en) 2005-11-16 2006-11-13 Motor-driven hammer drill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05024979A EP1787761B1 (en) 2005-11-16 2005-11-16 Motor-driven hammer drill

Publications (2)

Publication Number Publication Date
EP1787761A1 true EP1787761A1 (en) 2007-05-23
EP1787761B1 EP1787761B1 (en) 2010-01-06

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EP05024979A Not-in-force EP1787761B1 (en) 2005-11-16 2005-11-16 Motor-driven hammer drill

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US (1) US20070107920A1 (en)
EP (1) EP1787761B1 (en)
CN (1) CN101181784B (en)
AT (1) ATE454248T1 (en)
DE (1) DE502005008837D1 (en)

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Also Published As

Publication number Publication date
CN101181784A (en) 2008-05-21
EP1787761B1 (en) 2010-01-06
US20070107920A1 (en) 2007-05-17
CN101181784B (en) 2010-05-12
ATE454248T1 (en) 2010-01-15
DE502005008837D1 (en) 2010-02-25

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