EP0589267A2 - Drill- and/or impact hammer - Google Patents

Drill- and/or impact hammer Download PDF

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Publication number
EP0589267A2
EP0589267A2 EP93114210A EP93114210A EP0589267A2 EP 0589267 A2 EP0589267 A2 EP 0589267A2 EP 93114210 A EP93114210 A EP 93114210A EP 93114210 A EP93114210 A EP 93114210A EP 0589267 A2 EP0589267 A2 EP 0589267A2
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EP
European Patent Office
Prior art keywords
eccentric
shaft
drive member
hammer
fork
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
EP93114210A
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German (de)
French (fr)
Other versions
EP0589267A3 (en
EP0589267B1 (en
Inventor
Wolfgang Dipl.-Ing. Schmid
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP0589267A2 publication Critical patent/EP0589267A2/en
Publication of EP0589267A3 publication Critical patent/EP0589267A3/en
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Publication of EP0589267B1 publication Critical patent/EP0589267B1/en
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Classifications

    • 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
    • B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/061—Swash-plate actuated impulse-driving mechanisms

Definitions

  • the invention is based on a hammer drill and / or percussion hammer according to the preamble of claim 1.
  • DE 41 21 279 A1 already discloses such a device in which the percussion mechanism is coupled to the idle device controlled by the tool via a claw coupling. A fixed part is connected to a rotating part via the claw coupling, which leads to wear and increased working noise.
  • the hammer and / or percussion hammer according to the invention with the characterizing features of claim 1 has the advantage that the coupling of the percussion mechanism is smooth, without wear and noise.
  • the clutch is also simple and inexpensive to manufacture.
  • the coupling fork can be continued in one piece up to the racket and thus serves to dampen the striking mechanism.
  • Figure 1 shows a longitudinal section through a known hammer drill.
  • Figure 2 shows in detail a hammer mechanism of a rotary hammer according to the invention.
  • FIG. 1 a housing 2 with a motor 3 installed at the rear of an already known rotary hammer is shown.
  • This drives a shaft 4, via which an impact mechanism 5 and a tool holder 6 located at the front are further driven.
  • a drive member 7 for the striking mechanism 5 is arranged on the shaft 4.
  • This has an eccentric 8, which consists of a sleeve pushed onto the shaft 4, the wall thickness of which continuously increases and decreases over the course of 360 °.
  • the outer circumference of the eccentric 8 forms an eccentric cam track 9 with respect to the shaft 4.
  • the eccentric 8 is enclosed by a needle bearing 10, the outer ring of which is formed by a joint sleeve 11. This carries a downward extension 12 in which there is an opening 13.
  • An elastically flexible driver member 15 mounted in the housing 2 cooperates with the drive member 7. It can be tilted about an axis 16 fixed to the housing.
  • An eyelet 17 is formed around the axis 16.
  • Axis 16 and eyelet 17 form a hinge 18.
  • a lever 19 extends away from the eyelet 17 towards the articulation sleeve 11 and passes through the opening 13.
  • the eyelet 17 extends away a two-leg bracket 20, which is closed at its end 21 like a loop and is articulated with play between two frets 22, 23 of a racket 24.
  • a line which is extended in a straight line away from the stirrup end 21 onto the axis 16 intersects the center line of the axis 16.
  • the striker 24 extends longitudinally in the axial direction of a tool 25 inserted into the tool holder 6 and is mounted in a longitudinal guide 26.
  • An O-ring 27 is inserted into the longitudinal guide and has a damping effect on the racket and prevents the racket 24 from moving automatically.
  • An intermediate striker 28 is arranged between the striker 24 and the tool 25.
  • the driver member 15 is designed and mounted so that the bearing 10 is only loaded radially in a design manner. In particular, the return force of the racket 24 acting transversely to the driver member is absorbed and damped by the elastic driver member 15 itself.
  • the tool holder 6 is driven via the shaft 4, which at the end has a toothing 29, and a toothed wheel 30 engaging in it.
  • the gear wheel is firmly connected to an axially limitedly movable hammer tube 31 surrounding the striking mechanism 5.
  • a continuously rotating, axially displaceable coupling part 32 also engages in the toothing 29 and can be coupled to the eccentric 8 via claws for engaging the striking mechanism.
  • the Coupling parts 8/32 are held apart by a compression spring 35. Only when the gear 30 together with the hammer tube is pressed against the coupling part 32 by the tool 25 pressed against a workpiece, does the coupling 8/32 close, so that the drive member 7 now rotates with the shaft 4 and the striking mechanism 5 is started .
  • the invention differs from the hammer drill shown in FIG. 1 by an improved design of the coupling between shaft 4 and drive member 7, which is shown in FIG. Parts that are functionally identical to those in FIG. 1 are generally provided with reference numbers increased by 100.
  • the rear motor 103 drives a two-part shaft 104 for assembly reasons, on which a drive member 107 belonging to the striking mechanism 105 is seated axially displaceably and in a rotationally locking manner.
  • An eccentric 108 is integrally connected to the drive member 107 and forms a curved path 109 on the circumference.
  • a bearing 110 with a laterally chamfered outer ring 111 is mounted on this.
  • the fork 112 On the outer ring 111 is a two-part elastic fork 112 with its arms 113 and 114 from two sides.
  • the fork 112 can also be formed in one piece. Its largest inner radius is at least as large as the largest radius of the eccentric 108 or the bearing outer ring 111.
  • the fork 112 is connected to a driver member 115 and is pivotable together with the latter about a tilt axis 116.
  • the arms 113, 114 continue along a bracket 120 of the driver member 115 and engage together with this in a recess 122 of a racket 124.
  • the arms 113, 114 of the fork 112 thus serve at the same time to cushion and dampen the coupling of the driver member 115 to the racket 124.
  • the bat 124 acts on a likewise axially movably mounted spindle 131, with which a tool holder, not shown, can be connected.
  • the spindle 131 carries a gear 130 which is firmly connected to it and which engages in a longitudinal toothing 129 on the shaft 104.
  • the longitudinal teeth are so long that both the gear 130 and the drive member 107 remain in engagement in each axial position of the spindle 131.
  • a gear lever 137 for striking mechanism shutdown engages on gear 130 on the racket side opposite shaft 104 with its eccentric pin 136. This is stored in the housing 102. To reduce the friction between the gear 130 and the pin 136, the latter carries a ball bearing 138. Instead of the ball bearing 138, a plain bearing, for example in the form of a sleeve held by means of a snap ring on the pin 136.
  • the driver member 115 In operation of the hammer drill, the driver member 115 is driven back and forth via the eccentric 108. In this case, only the vertical deflections of the eccentric 108 lying in the plane of the drawing are transmitted through the fork 112 to the driver member 115, which can only be tilted in this plane.
  • the striking mechanism is shown in operation, the striker 124 is in its foremost position, which acts on the spindle 131. The rotary drive of the spindle 131 takes place via the toothing 129 of the shaft 104 and the gear 130.
  • the striking mechanism is switched off by the tool (not shown in FIG. 2) by moving the gear 130 away from the striker 124 and the drive member 107 following it due to a spring (not shown).
  • the eccentric 108 slides out with its bearing 110 the fork 112 out.
  • the driver member 115 stops and with it the attached racket 124. This prevents weary blows of the striking mechanism 105, in particular when work is interrupted.
  • the hammer mechanism can also be switched off arbitrarily for pure drilling.
  • the shift lever 137 is rotated by 90 °, so that the pin 136 assumes its forward position.
  • the gear 130 and the drive member 107 following it are also moved into its forward position.
  • the eccentric 108 disengages from the fork 112 and the striking mechanism 105 out of operation.
  • the striking mechanism 105 is reconnected in a very material-friendly manner in that the bent ends of the arms 113, 114 of the funnel-shaped fork 112 rest against the oncoming outer ring 111 of the bearing 110. As the drive member 107 progressively moves rearward, the outer ring 111 dips more and more into the fork 112 until the eccentric deflection is fully transmitted to the driver member 115. The elasticity of the fork 112 causes additional damping when engaging.

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

Abstract

In a powered hand tool with bail-spring (bowed-spring) percussive mechanism, the coupling of the percussive mechanism (105) is effected by axial displacement of an eccentric drive member (107) on a shaft (104). During this process, the eccentric (108) slides into a fork (112) coupled to a driver member (115) for the reciprocating drive of the percussive element (124). The axial displacement of the drive member (107) is effected by displacement of a gearwheel (130) connected to the tool spindle (131). <IMAGE>

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Bohr- und/oder Schlaghammer nach dem Oberbegriff des Anspruchs 1. Aus der DE 41 21 279 A1 ist bereits ein solches Gerät bekannt, bei dem das Schlagwerk über eine Klauenkupplung mit der vom Werkzeug gesteuerten Leerlaufeinrichtung gekoppelt ist. Über die Klauenkupplung wird ein feststehendes mit einem rotierenden Teil verbunden, was zu Verschleiß und erhöhtem Arbeitsgeräusch führt.The invention is based on a hammer drill and / or percussion hammer according to the preamble of claim 1. DE 41 21 279 A1 already discloses such a device in which the percussion mechanism is coupled to the idle device controlled by the tool via a claw coupling. A fixed part is connected to a rotating part via the claw coupling, which leads to wear and increased working noise.

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße Bohr- und/oder Schlaghammer mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß die Einkuppelung des Schlagwerks sanft, ohne Verschleiß und geräuscharm erfolgt. Die Schaltkupplung ist weiter einfach aufgebaut und preiswert herstellbar. Die Kupplungsgabel kann an einem Stück bis zum Schläger weitergeführt sein und dient damit gleichzeitig der Dämpfung des Schlagwerks.The hammer and / or percussion hammer according to the invention with the characterizing features of claim 1 has the advantage that the coupling of the percussion mechanism is smooth, without wear and noise. The clutch is also simple and inexpensive to manufacture. The coupling fork can be continued in one piece up to the racket and thus serves to dampen the striking mechanism.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Bohr- und/oder Schlaghammers möglich. Insbesondere ist der gesamte Schaltmechanismus einschließlich der manuellen Abschaltung des Schlagwerks sehr einfach, funktionssicher und teilesparend aufgebaut.The measures listed in the dependent claims allow advantageous developments and improvements of the hammer drill and / or percussion hammer specified in claim 1. In particular, the entire switching mechanism, including the manual switching off of the striking mechanism, is very simple, reliable and saves parts.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Figur 1 zeigt einen Längsschnitt durch einen bekannten Bohrhammer. Figur 2 zeigt im Detail ein Schlagwerk eines erfindungsgemäßen Bohrhammers.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. Figure 1 shows a longitudinal section through a known hammer drill. Figure 2 shows in detail a hammer mechanism of a rotary hammer according to the invention.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 ist von einem bereits bekannten Bohrhammer ein Gehäuse 2 mit einem hinten eingebauten Motor 3 gezeigt. Dieser treibt eine Welle 4, über die weiter ein Schlagwerk 5 und eine vorne befindliche Werkzeugaufnahme 6 angetrieben werden. Auf der Welle 4 ist ein Antriebsglied 7 für das Schlagwerk 5 angeordnet. Dieses weist einen Exzenter 8 auf, der aus einer auf die Welle 4 aufgeschobenen Hülse besteht, deren Wandstärke im Verlauf von 360° kontinuierlich zu und wieder abnimmt. Der Außenumfang des Exzenters 8 bildet bezüglich der Welle 4 eine exzentrische Kurvenbahn 9. Der Exzenter 8 wird von einem Nadellager 10 umschlossen, dessen Außenring von einer Anlenkhülse 11 gebildet wird. Diese trägt einen nach unten gerichteten Fortsatz 12 in dem sich ein Durchbruch 13 befindet.In FIG. 1, a housing 2 with a motor 3 installed at the rear of an already known rotary hammer is shown. This drives a shaft 4, via which an impact mechanism 5 and a tool holder 6 located at the front are further driven. A drive member 7 for the striking mechanism 5 is arranged on the shaft 4. This has an eccentric 8, which consists of a sleeve pushed onto the shaft 4, the wall thickness of which continuously increases and decreases over the course of 360 °. The outer circumference of the eccentric 8 forms an eccentric cam track 9 with respect to the shaft 4. The eccentric 8 is enclosed by a needle bearing 10, the outer ring of which is formed by a joint sleeve 11. This carries a downward extension 12 in which there is an opening 13.

Mit dem Antriebsglied 7 arbeitet ein im Gehäuse 2 gelagertes elastisch nachgiebiges Treiberglied 15 zusammen. Es ist um eine gehäusefeste Achse 16 kippbar. Um die Achse 16 herum ist eine Öse 17 gebildet. Achse 16 und Öse 17 bilden ein Gelenk 18. Von der Öse 17 weg erstreckt sich ein Hebel 19 zur Anlenkhülse 11 hin und durchgreift den Durchbruch 13. In einem Winkel von vorzugsweise ca. 90° bezüglich des Hebels 19 erstreckt sich von der Öse 17 weg ein zweischenkeliger Bügel 20, der an seinem Ende 21 schlaufenartig geschlossen ist und mit Spiel zwischen zwei Bünden 22, 23 eines Schlägers 24 angelenkt ist. Eine geradlinig von dem Bügelende 21 weg auf die Achse 16 zu verlängerte Linie schneidet die Mittellinie der Achse 16. Ebenso schneidet die Mittellinie des Hebels 19 die Mittellinie der Achse 16 und außerdem die Mittellinie des Bügelendes 21 unter 90°. Der Schläger 24 erstreckt sich längs in Achsrichtung eines in die Werkzeugaufnahme 6 eingesetzten Werkzeugs 25 und ist in einer Längsführung 26 gelagert. In die Längsführung ist ein O-Ring 27 eingesetzt, der auf den Schläger dämpfend wirkt und ein selbstätiges Verschieben des Schlägers 24 verhindert. Zwischen dem Schläger 24 und dem Werkzeug 25 ist ein Zwischendöpper 28 angeordnet.An elastically flexible driver member 15 mounted in the housing 2 cooperates with the drive member 7. It can be tilted about an axis 16 fixed to the housing. An eyelet 17 is formed around the axis 16. Axis 16 and eyelet 17 form a hinge 18. A lever 19 extends away from the eyelet 17 towards the articulation sleeve 11 and passes through the opening 13. At an angle of preferably approximately 90 ° with respect to the lever 19, the eyelet 17 extends away a two-leg bracket 20, which is closed at its end 21 like a loop and is articulated with play between two frets 22, 23 of a racket 24. A line which is extended in a straight line away from the stirrup end 21 onto the axis 16 intersects the center line of the axis 16. Likewise, the center line of the lever 19 intersects the center line of the axis 16 and also the center line of the stirrup end 21 at 90 °. The striker 24 extends longitudinally in the axial direction of a tool 25 inserted into the tool holder 6 and is mounted in a longitudinal guide 26. An O-ring 27 is inserted into the longitudinal guide and has a damping effect on the racket and prevents the racket 24 from moving automatically. An intermediate striker 28 is arranged between the striker 24 and the tool 25.

Das Treiberglied 15 ist so ausgebildet und gelagert, daß das Lager 10 in bauartgemäßer Weise nur radial belastet wird. Insbesondere wird die quer zu dem Treiberglied wirkende Rückschlagkraft des Schlägers 24 von dem elastischen Treiberglied 15 selbst aufgenommen und gedämpft. Der Werkzeughalter 6 ist über die Welle 4, die am Ende eine Verzahnung 29 trägt, sowie ein in diese eingreifendes Zahnrad 30 drehend angetrieben. Das Zahnrad ist fest mit einem das Schlagwerk 5 umgebenden axial begrenzt beweglichen Hammerrohr 31 verbunden.The driver member 15 is designed and mounted so that the bearing 10 is only loaded radially in a design manner. In particular, the return force of the racket 24 acting transversely to the driver member is absorbed and damped by the elastic driver member 15 itself. The tool holder 6 is driven via the shaft 4, which at the end has a toothing 29, and a toothed wheel 30 engaging in it. The gear wheel is firmly connected to an axially limitedly movable hammer tube 31 surrounding the striking mechanism 5.

In die Verzahnung 29 greift weiter ein ständig mitdrehendes, axial verschiebliches Kupplungsteil 32 ein, welches mit dem Exzenter 8 über Klauen zum Zuschalten des Schlagwerks kuppelbar ist. Die Kupplungsteile 8/32 werden durch eine Druckfeder 35 auseinandergehalten. Nur wenn das Zahnrad 30 zusammen mit dem Hammerrohr von dem an ein Werkstück angedrückten Werkzeug 25 gegen das Kupplungsteil 32 gedrückt wird, schließt die Kupplung 8/32, so daß das Antriebsglied 7 nun mit der Welle 4 mitdreht und das Schlagwerk 5 in Gang gesetzt ist.A continuously rotating, axially displaceable coupling part 32 also engages in the toothing 29 and can be coupled to the eccentric 8 via claws for engaging the striking mechanism. The Coupling parts 8/32 are held apart by a compression spring 35. Only when the gear 30 together with the hammer tube is pressed against the coupling part 32 by the tool 25 pressed against a workpiece, does the coupling 8/32 close, so that the drive member 7 now rotates with the shaft 4 and the striking mechanism 5 is started .

Die Erfindung unterscheidet sich von dem in Figur 1 dargestellten Bohrhammer durch eine verbesserte Ausbildung der Kupplung zwischen Welle 4 und Antriebsglied 7, die in Figur 2 gezeigt ist. Teile, die mit denen in Figur 1 funktionsgleich sind, sind in der Regel mit um 100 erhöhten Bezugszahlen versehen. Der hintenliegende Motor 103 treibt eine aus Montagegründen zweiteilige Welle 104 an, auf der ein zum Schlagwerk 105 gehörendes Antriebsglied 107 axial verschieblich und drehschlüssig sitzt. Mit dem Antriebsglied 107 ist einstückig ein Exzenter 108 verbunden, der am Umfang eine Kurvenbahn 109 bildet. Auf diese ist ein Lager 110 mit seitlich angefastem Außenring 111 aufgezogen.The invention differs from the hammer drill shown in FIG. 1 by an improved design of the coupling between shaft 4 and drive member 7, which is shown in FIG. Parts that are functionally identical to those in FIG. 1 are generally provided with reference numbers increased by 100. The rear motor 103 drives a two-part shaft 104 for assembly reasons, on which a drive member 107 belonging to the striking mechanism 105 is seated axially displaceably and in a rotationally locking manner. An eccentric 108 is integrally connected to the drive member 107 and forms a curved path 109 on the circumference. A bearing 110 with a laterally chamfered outer ring 111 is mounted on this.

An dem Außenring 111 liegt eine zweiteilige elastische Gabel 112 mit ihren Armen 113 und 114 von zwei Seiten an. Die Gabel 112 kann auch einstückig ausgebildet sein. Ihr größter Innenhalbmesser ist mindestens so groß wie der größte Halbmesser des Exzenters 108 bzw. des Lageraußenrings 111. Die Gabel 112 ist mit einem Treiberglied 115 verbunden und mit diesem zusammen um eine Kippachse 116 schwenkbar. Die Arme 113, 114 setzen sich entlang eines Bügels 120 des Treibergliedes 115 fort und greifen mit diesem zusammen in eine Ausnehmung 122 eines Schlägers 124 ein. Die Arme 113, 114 der Gabel 112 dienen damit gleichzeitig der Abfederung und Dämpfung der Ankoppelung des Treibergliedes 115 an den Schläger 124. Dieser ist in einer Längsführung, die eine Aussparung 127 für den Durchtritt des Treibergliedes 115 aufweist, axial verschieblich geführt. Der Schläger 124 wirkt auf eine ebenfalls axial beweglich gelagerte Spindel 131 ein, mit der ein nicht gezeigter Werkzeughalter verbindbar ist. Die Spindel 131 trägt ein fest mit ihr verbundenes Zahnrad 130, das in eine Längsverzahnung 129 an der Welle 104 eingreift. Die Längsverzahnung ist so lang ausgeführt, daß sowohl das Zahnrad 130 als auch das Antriebsglied 107 in jeder Axialstellung der Spindel 131 in Eingriff bleiben.On the outer ring 111 is a two-part elastic fork 112 with its arms 113 and 114 from two sides. The fork 112 can also be formed in one piece. Its largest inner radius is at least as large as the largest radius of the eccentric 108 or the bearing outer ring 111. The fork 112 is connected to a driver member 115 and is pivotable together with the latter about a tilt axis 116. The arms 113, 114 continue along a bracket 120 of the driver member 115 and engage together with this in a recess 122 of a racket 124. The arms 113, 114 of the fork 112 thus serve at the same time to cushion and dampen the coupling of the driver member 115 to the racket 124. This is guided axially displaceably in a longitudinal guide which has a recess 127 for the passage of the driver member 115. The bat 124 acts on a likewise axially movably mounted spindle 131, with which a tool holder, not shown, can be connected. The spindle 131 carries a gear 130 which is firmly connected to it and which engages in a longitudinal toothing 129 on the shaft 104. The longitudinal teeth are so long that both the gear 130 and the drive member 107 remain in engagement in each axial position of the spindle 131.

An dem Zahnrad 130 greift schlägerseitig gegenüber der Welle 104 mit seinem exzentrischem Zapfen 136 ein Schalthebel 137 zur Schlagwerksabschaltung an. Dieser ist im Gehäuse 102 gelagert. Zur Verminderung der Reibung zwischen Zahnrad 130 und Zapfen 136 trägt dieser ein Kugellager 138. Statt des Kugellagers 138 kann auch ein Gleitlager z.B. in Form einer mittels eines Sprengrings an dem Zapfen 136 gehaltenen Hülse Anwendung finden.A gear lever 137 for striking mechanism shutdown engages on gear 130 on the racket side opposite shaft 104 with its eccentric pin 136. This is stored in the housing 102. To reduce the friction between the gear 130 and the pin 136, the latter carries a ball bearing 138. Instead of the ball bearing 138, a plain bearing, for example in the form of a sleeve held by means of a snap ring on the pin 136.

Im Betrieb des Bohrhammers wird das Treiberglied 115 über den Exzenter 108 hin- und hergehend angetrieben. Dabei werden durch die Gabel 112 nur die in der Zeichnungsebene liegenden vertikalen Auslenkungen des Ezzenters 108 auf das Treiberglied 115 übertragen, das nur in dieser Ebene kippbar ist. In Figur 2 ist das Schlagwerk im Betrieb dargestellt, der Schläger 124 befindet sich in seiner vordersten, die Spindel 131 beaufschlagenden Stellung. Der Drehantrieb der Spindel 131 erfogt über die Verzahnung 129 der Welle 104 und das Zahnrad 130.In operation of the hammer drill, the driver member 115 is driven back and forth via the eccentric 108. In this case, only the vertical deflections of the eccentric 108 lying in the plane of the drawing are transmitted through the fork 112 to the driver member 115, which can only be tilted in this plane. In Figure 2, the striking mechanism is shown in operation, the striker 124 is in its foremost position, which acts on the spindle 131. The rotary drive of the spindle 131 takes place via the toothing 129 of the shaft 104 and the gear 130.

Das Schlagwerk wird bei fehlendem Andruck der Spindel 131 bzw. fehlendem Druck vom in Figur 2 nicht gezeigten Werkzeug her abgeschaltet, indem das Zahnrad 130 vom Schläger 124 weg nach vorne rückt und das Antriebsglied 107 ihm aufgrund einer nicht gezeigten Feder folgt. Dabei gleitet der Exzenter 108 mit seinem Lager 110 aus der Gabel 112 heraus. Das Treiberglied 115 bleibt stehen und mit ihm der angekoppelte Schläger 124. Dadurch werden insbesondere bei Arbeitsunterbrechungen verschleißende Leerschläge des Schlagwerks 105 vermieden.If the spindle 131 is not pressed or the pressure is not applied, the striking mechanism is switched off by the tool (not shown in FIG. 2) by moving the gear 130 away from the striker 124 and the drive member 107 following it due to a spring (not shown). The eccentric 108 slides out with its bearing 110 the fork 112 out. The driver member 115 stops and with it the attached racket 124. This prevents weary blows of the striking mechanism 105, in particular when work is interrupted.

Das Schlagwerk kann zum reinen Bohren auch willkürlich abgeschaltet werden. Dazu wird der Schalthebel 137 um 90° gedreht, so daß der Zapfen 136 seine vordere Stellung einnimmt. Dabei werden das Zahnrad 130 und das ihm folgende Antriebsglied 107 ebenfalls in seine vordere Stellung gerückt. Der Exzenter 108 beibt außer Eingriff mit der Gabel 112 und das Schlagwerk 105 außer Betrieb.The hammer mechanism can also be switched off arbitrarily for pure drilling. For this purpose, the shift lever 137 is rotated by 90 °, so that the pin 136 assumes its forward position. The gear 130 and the drive member 107 following it are also moved into its forward position. The eccentric 108 disengages from the fork 112 and the striking mechanism 105 out of operation.

Das Wiedereinkuppeln des Schlagwerks 105 geschieht auf sehr materialschonende Weise dadurch, daß sich die aufgebogenen Enden der Arme 113, 114 der trichterförmigen Gabel 112 an den entgegenkommenden Außenring 111 des Lagers 110 anlegen. Mit fortschreitender Verschiebung des Antriebsgliedes 107 nach hinten taucht der Außenring 111 mehr und mehr in die Gabel 112 ein bis eine volle Übertragung des Exzenterausschlags auf das Treiberglied 115 stattfindet. Die Elastizität der Gabel 112 bewirkt eine zusätzliche Dämpfung beim Einkuppeln.The striking mechanism 105 is reconnected in a very material-friendly manner in that the bent ends of the arms 113, 114 of the funnel-shaped fork 112 rest against the oncoming outer ring 111 of the bearing 110. As the drive member 107 progressively moves rearward, the outer ring 111 dips more and more into the fork 112 until the eccentric deflection is fully transmitted to the driver member 115. The elasticity of the fork 112 causes additional damping when engaging.

Claims (8)

Bohr- und/oder Schlaghammer mit in einem Gehäuse (2, 102) untergebrachtem Motor (3, 103) und einem Schlagwerk (5, 105), dessen Schläger (24, 124) von einem Treiberglied (15, 115) etwa in seiner axialen Richtung beschleunigt wird und der periodisch direkt oder indirekt über eine Spindel (131) axial auf den Schaft eines Werkzeugs (25), auftrifft, welches Treiberglied (15, 115) um eine Kippachse (16, 116) kippbar ist und von einem Antriebsglied (7, 107) mit Exzenter (8, 108) hin- und hergehend angetrieben wird, das seinerseits von einer Welle (4, 104) in Drehung versetzt wird, dadurch gekennzeichnet, daß das Antriebsglied (107) zur Abkuppelung des Schlagwerks (105) gegenüber dem Treiberglied (115) verschieblich ist, und das Treiberglied (115) eine das Antriebsglied (107) in seiner angekuppelten Stellung übergreifende Gabel (112) aufweist.Hammer drill and / or percussion hammer with a motor (3, 103) housed in a housing (2, 102) and a striking mechanism (5, 105), the striker (24, 124) of which is approximately in its axial direction by a driver member (15, 115) Direction is accelerated and which periodically strikes the shaft of a tool (25), directly or indirectly axially via a spindle (131), which driver member (15, 115) can be tilted about a tilt axis (16, 116) and is driven by a drive member (7 , 107) with an eccentric (8, 108) is driven back and forth, which in turn is set in rotation by a shaft (4, 104), characterized in that the drive member (107) for decoupling the striking mechanism (105) relative to the Driver member (115) is displaceable, and the driver member (115) has a fork (112) overlapping the drive member (107) in its coupled position. Bohr- und/oder Schlaghammer nach Anspruch 1, dadurch gekennzeichnet, daß die Gabel (112) sich trichterförmig erweitert, wobei ihr größter Innenhalbmesser mindestens so groß ist wie der größte Halbmesser des Exzenters (108).Hammer drill and / or percussion hammer according to claim 1, characterized in that the fork (112) widens in a funnel shape, its largest inner diameter being at least as large as the largest diameter of the eccentric (108). Bohr- und/oder Schlaghammer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Gabel (112) elastisch federnd ist.Hammer drill and / or percussion hammer according to claim 1 or 2, characterized in that the fork (112) is resilient. Bohr- und/oder Schlaghammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Gabel (112) zwei den Exzenter (108) an zwei Seiten umgreifende Arme (113, 114) hat.Hammer drill and / or percussion hammer according to one of the preceding claims, characterized in that the fork (112) has two arms (113, 114) encompassing the eccentric (108) on two sides. Bohr- und/oder Schlaghammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Exzenter (108) an seinem Unfang ein Lager (110) mit angefastem Außenring (111) trägt.Hammer drill and / or percussion hammer according to one of the preceding claims, characterized in that the eccentric (108) carries at its periphery a bearing (110) with a chamfered outer ring (111). Bohr- und/oder Schlaghammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Antriebsglied (107) auf der Welle (104) axial verschieblich ist.Hammer drill and / or percussion hammer according to one of the preceding claims, characterized in that the drive member (107) is axially displaceable on the shaft (104). Bohr- und/oder Schlaghammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein mit einer Spindel (131) fest verbundenes axial verschiebliches Zahnrad (130) die axiale Lage des Antriebsgliedes (107) auf der Welle (104) beeinflußt.Hammer drill and / or percussion hammer according to one of the preceding claims, characterized in that an axially displaceable gearwheel (130) fixedly connected to a spindle (131) influences the axial position of the drive member (107) on the shaft (104). Bohr- und/oder Schlaghammer mit in einem Gehäuse (2, 102) untergebrachtem Motor (3, 103) und einem Schlagwerk (5, 105), dessen Schläger (24, 124) von einem Treiberglied (15, 115) etwa in seiner axialen Richtung beschleunigt wird und der periodisch direkt oder indirekt über eine Spindel (131) axial auf den Schaft eines Werkzeugs (25), auftrifft, welches Treiberglied (15, 115) um eine Kippachse (16, 116) kippbar ist und von einem Antriebsglied (7, 107) mit Exzenter (8, 108) hin- und hergehend angetrieben wird, das seinerseits von einer Welle (4, 104) in Drehung versetzt wird, dadurch gekennzeichnet, daß das Schlagwerk (105) mittels eines an dem Zahnrad (130) angreifenden Schalthebels (137) manuell abschaltbar ist.Hammer drill and / or percussion hammer with a motor (3, 103) housed in a housing (2, 102) and a striking mechanism (5, 105), the striker (24, 124) of which is approximately in its axial direction by a driver member (15, 115) Direction is accelerated and which periodically strikes the shaft of a tool (25), directly or indirectly axially via a spindle (131), which driver member (15, 115) can be tilted about a tilt axis (16, 116) and is driven by a drive member (7 , 107) is driven back and forth with an eccentric (8, 108), which in turn is set in rotation by a shaft (4, 104), characterized in that the striking mechanism (105) engages with the gearwheel (130) Switch lever (137) can be switched off manually.
EP93114210A 1992-09-24 1993-09-04 Drill- and/or impact hammer Expired - Lifetime EP0589267B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4231985 1992-09-24
DE4231985A DE4231985A1 (en) 1992-09-24 1992-09-24 Hammer and / or percussion hammer

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EP0589267A2 true EP0589267A2 (en) 1994-03-30
EP0589267A3 EP0589267A3 (en) 1994-06-01
EP0589267B1 EP0589267B1 (en) 1997-01-02

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EP93114210A Expired - Lifetime EP0589267B1 (en) 1992-09-24 1993-09-04 Drill- and/or impact hammer

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DE (2) DE4231985A1 (en)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2008107232A1 (en) * 2007-03-02 2008-09-12 Robert Bosch Gmbh Gearbox device
WO2012072326A1 (en) * 2010-11-29 2012-06-07 Robert Bosch Gmbh Hammer percussion mechanism

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Publication number Priority date Publication date Assignee Title
DE19652751C2 (en) * 1996-12-18 1999-08-19 Bosch Gmbh Robert Hand machine tool with a blower
DE19958420A1 (en) * 1999-12-03 2001-06-07 Arno Thiel Sprung striking tool has cam shaft coaxial with torsional leg spring, coupling and sleeve

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Publication number Priority date Publication date Assignee Title
US4325436A (en) * 1980-05-21 1982-04-20 Hilti Aktiengesellschaft Hammer drill or chipping hammer device
EP0145070A2 (en) * 1983-11-24 1985-06-19 Emerson Electric Co. Device for driving a drilling and/or impacting tool
DE3931329C1 (en) * 1989-05-31 1990-06-28 Robert Bosch Gmbh, 7000 Stuttgart, De
DE4121279A1 (en) * 1991-06-27 1993-01-07 Bosch Gmbh Robert DRILL AND / OR SLOPE

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US4325436A (en) * 1980-05-21 1982-04-20 Hilti Aktiengesellschaft Hammer drill or chipping hammer device
EP0145070A2 (en) * 1983-11-24 1985-06-19 Emerson Electric Co. Device for driving a drilling and/or impacting tool
DE3931329C1 (en) * 1989-05-31 1990-06-28 Robert Bosch Gmbh, 7000 Stuttgart, De
DE4121279A1 (en) * 1991-06-27 1993-01-07 Bosch Gmbh Robert DRILL AND / OR SLOPE

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008107232A1 (en) * 2007-03-02 2008-09-12 Robert Bosch Gmbh Gearbox device
US8176994B2 (en) 2007-03-02 2012-05-15 Robert Bosch Gmbh Transmission device
RU2467866C2 (en) * 2007-03-02 2012-11-27 Роберт Бош Гмбх Transfer mechanism
CN101641188B (en) * 2007-03-02 2014-03-05 罗伯特·博世有限公司 Gearbox device
WO2012072326A1 (en) * 2010-11-29 2012-06-07 Robert Bosch Gmbh Hammer percussion mechanism

Also Published As

Publication number Publication date
DE59304954D1 (en) 1997-02-13
EP0589267A3 (en) 1994-06-01
DE4231985A1 (en) 1994-03-31
EP0589267B1 (en) 1997-01-02

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