EP1108504B1 - Hand held power tool - Google Patents

Hand held power tool Download PDF

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Publication number
EP1108504B1
EP1108504B1 EP20000124983 EP00124983A EP1108504B1 EP 1108504 B1 EP1108504 B1 EP 1108504B1 EP 20000124983 EP20000124983 EP 20000124983 EP 00124983 A EP00124983 A EP 00124983A EP 1108504 B1 EP1108504 B1 EP 1108504B1
Authority
EP
European Patent Office
Prior art keywords
hand held
held power
power tool
locking
locking body
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.)
Expired - Lifetime
Application number
EP20000124983
Other languages
German (de)
French (fr)
Other versions
EP1108504A1 (en
Inventor
Helmut Wanek
Markus Heckmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1108504A1 publication Critical patent/EP1108504A1/en
Application granted granted Critical
Publication of EP1108504B1 publication Critical patent/EP1108504B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084Rotating chucks or sockets
    • B25D17/088Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2217/00Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003Details relating to chucks with radially movable locking elements
    • B25D2217/0038Locking members of special shape
    • B25D2217/0049Roll-shaped locking members

Definitions

  • the invention relates to a hand tool according to the preamble of claim 1.
  • the tool holder has a base body and a receiving bore arranged therein for drilling and striking tools, in which a jaw chuck as a first tool holder and a separate second tool holder for tools are arranged with a Nutenschaft.
  • the second tool holder has a radially displaceable locking body in the form of a locking ball, which is insertable in the shaft end closed grooves of the tools and is held by a limited axially movable locking sleeve and a retaining sleeve in its locking position.
  • the locking sleeve is loaded via the retaining sleeve with a spring in the direction of its blocking position. In the locking position of the locking body, the blocking element radially overlaps the ball and the holding sleeve secures the ball with a projection in the axial direction.
  • the ball When inserting the tool, the ball is moved by the shaft end of the tool in a longitudinal slot in the insertion direction.
  • the retaining sleeve is moved at its projection on the ball against the spring.
  • Between the locking element and the retaining sleeve creates a free space into which the ball can dodge radially outward.
  • the tool can be introduced.
  • the prestressed spring displaces the retaining sleeve into its initial position and presses the ball into the groove of the tool.
  • the blocking element is moved with an actuating sleeve against the retaining sleeve and against the retaining sleeve loading spring, so that the ball dodge radially outward and the tool can be removed. Thereafter, the spring pushes the retaining sleeve, the locking element and the ball back to their original positions.
  • the invention relates to a hand tool, in particular a hammer drill, with a rotationally driven tool holder for receiving tools with a Nutenschaft having at least one radially displaceable locking body which is insertable into a closed end of the shaft groove of the tool and of a blocking element in is held in its locking position.
  • the blocking element is held in a locking body radially releasing position by a latching connection and is loaded via at least one spring in the direction of its blocking position. It can structurally simple an at least partially automated locking can be achieved with particularly long locking bodies by an axial movement of the locking body is avoidable. If the blocking element held by the locking connection in the locking body radially releasing position, the tool can be inserted and removed without the locking body must be moved axially. By long locking body rotational drive elements can be saved or advantageously supported in their function. The wear on the rotary driving elements can be reduced and the life can be increased.
  • the spring loading the locking element is also advantageously used to hold the locking element in its locking position, whereby additional locking means can be saved.
  • the latching connection can be achieved in a partially automated locking of the locking body via an actuating element, for example via a push button, which is actuated after insertion of a tool.
  • the latching connection has at least one in the locking body releasing position of the locking element in a receiving region of the tool holder projecting component, via which the latching connection during insertion of the tool is releasable. It can be achieved a high level of comfort with few components.
  • the blocking element can be rotated with a recess over the locking body, axial space can be saved and, in particular, a long locking body can be locked or released with a small adjustment path. A tilting and / or misjudging the locking body can be safely avoided.
  • the blocking element in the axial direction or with a combined rotary and sliding movement in the axial direction in a locking body releasing position is feasible.
  • a translational unlocking movement of an actuating element is advantageously translated via a gear into a rotational movement.
  • the transmission can be realized by various constructive solutions that appear reasonable to those skilled in the art, for example via a rack and pinion, etc.
  • the actuator is operatively connected to the locking element via a cam mechanism, a particularly cost-effective and space-saving design can be achieved.
  • a cam member of the cam gear in an outer periphery is advantageous introduced the blocking element. Additional components and installation space can be saved.
  • the actuating element is connected via a driving sleeve with the blocking element, whereby additional degrees of freedom can be created. If the driving sleeve rotatably in the direction of the locking position of the locking element and rotatably connected in the direction of the releasing position of the locking element with the actuating element, a control torque can be transmitted to the actuating element via the driving sleeve for unlocking the locking body. Furthermore, it can be achieved that during operation, the driving sleeve can rotate upon contact of the actuating element with an object, for example with a masonry, in the adjusting element. The actuator can be held in contact with an object with rotating tool holder and wear of the actuator can be largely avoided.
  • the locking body may have various designs that appear appropriate to those skilled in the art, in particular, the design can be designed specifically for a high torque transmission, for example with a trapezoidal cross section, etc.
  • the locking body is advantageously formed by a roller, the In addition, can be produced particularly inexpensive.
  • a tool holder 10 of a percussion drill for receiving tools with a Nutenschaft 12 is shown in longitudinal section.
  • the tool holder 10 has a base body 54, on which a rubber cap 60 is attached to a processing side via a clamping ring 56 and a retaining ring 58.
  • a main body 54 In the main body 54 are in recesses 62, 64, two radially displaceable locking body 14, 16th arranged, which are each insertable into a groove 20, 108 of the tools closed on the shaft end 18 and are held in their locking position by a releasable locking sleeve 22 (FIG. 3).
  • the locking sleeve 22 is held in its position releasing the locking bodies 14, 16 via a latching connection 28 and loaded via a torsion spring 30 in the direction 44 of its blocking position (FIGS. 1, 2 and 4), wherein the locking sleeve 22 for unlocking the locking bodies 14, 16 with a respective recess 24, 26 on the locking body 14, 16 is rotatable.
  • the torsion spring 30 is rotationally fixed at a first end in the direction of rotation via a projection 92 engaging in a groove 90 of the base body and supported in the axial direction by a sleeve 66 and engages positively with a projection 68 in a recess 70 of the locking sleeve 22 at a second end
  • the locking sleeve 22 is limited in its angle of rotation by a ball 102, which is guided in a groove 104 in the base body 54 and in a recess 106 in the locking sleeve 22 (FIG.
  • the latching connection 28 has a pin 34 which protrudes in the locking body 14, 16 releasing position of the locking sleeve 22 in a receiving area 32 of the tool holder 10. About the pin 34, the locking connection 28 during insertion of the tool is releasable. The pin 34 engages in its locking position (Fig. 1) with a projection 72 positively into a recess 74 of the locking sleeve 22. The pin 34 is loaded in the radial direction inwardly via an annular spring 76, against which the pin 34 when loosening the Locking connection 28 can be moved radially outwardly through the tool shank 12.
  • the tool holder 10 is axially displaceably guided for producing an idling or a drive connection and the locking bodies 14, 16 designed as rollers have the length of the grooves 20, 108 in the slot shaft 12 (FIG. 3).
  • the locking sleeve 22 is connected via a cam mechanism 38 with a driving sleeve 42, wherein a cam member 40 of the cam gear 38 is introduced in the form of an obliquely extending groove in an outer periphery of the locking sleeve 22, are guided in the integrally formed on the driving sleeve 42 projections 52.
  • the driving sleeve 42 is connected in the axial direction via a stop 48 with a setting sleeve 36, wherein the driving sleeve 42 is pressed with a coil spring 78 with the stopper 48 against a radially inwardly extending collar 80 of the adjusting sleeve 36.
  • the coil spring 78 is supported via a ring 84 on a shoulder 86 of the base body 54, wherein the ring 84 seals a spring chamber 110 of the coil spring 78 via a seal 88 radially on the adjusting sleeve 36 to the outside.
  • the driving sleeve 42 in the direction 44 of the locking position of the locking sleeve 22 with the adjusting sleeve 36 rotatably connected via an integrally formed on the stop 48 teeth 50, which engages molded into the adjusting sleeve 36 projections 82 (Fig. 4).
  • the adjusting sleeve 36 and the driving sleeve 42 are rotatably connected to each other, namely, the toothing 50 in Slide 46 of the releasing position over the protrusions 82.
  • the driving sleeve 42 can rotate relative to the adjusting sleeve 36, wherein the illustrated embodiment is designed for a counter-clockwise rotating tool.
  • the locking sleeve 22 is held by the locking connection 28 in its releasing position.
  • the locking body 14, 16 are pushed by the shaft end 18 radially outwardly into the recesses 24, 26 (FIGS. 1 and 2).
  • the locking body 14, 16 after further insertion of the tool on the grooves 20, 108 is pressed with the shaft end 18 of the pin 34 radially outwardly against the annular spring 76.
  • the projection 72 of the pin 34 is displaced out of the recess, the locking sleeve 22 is rotated by the torsion spring 30 and fixes the locking bodies 14, 16 in the radial direction in the grooves 20, 108 of the grooved shaft 12 (FIG. 3).
  • the adjusting sleeve 36 When removing the tool, the adjusting sleeve 36 is pulled with the driving sleeve 42 with a translational movement axially in the direction of the impact drill against the coil spring 78. The translational movement is translated via the cam gear 38 in a rotational movement and transmitted to the locking sleeve 22.
  • the driving sleeve 42 is supported via the toothing 50 in the direction 44 of the locking position on the adjusting sleeve 36.
  • the locking sleeve 22 rotates The pin 34 is pressed by the annular spring 76 with its projection 72 into the recess 74 and holds the locking sleeve 22 in its releasing position. If the tool with its groove shank 12 is subsequently pulled out of the receiving region 32 in the axial direction, the locking bodies 14, 16 are pressed radially outwardly into the recesses 24, 26 by the shank end 18.

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

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a hand tool according to the preamble of claim 1.

Aus der EP 0 456 003 B1 ist eine schlagende Handbohrmaschine mit einer drehend angetriebenen Werkzeughalterung bekannt. Die Werkzeughalterung besitzt einen Grundkörper und eine darin angeordnete Aufnahmebohrung für Bohr- und Schlagwerkzeuge, in der ein Backenfutter als erste Werkzeugaufnahme und eine gesonderte zweite Werkzeugaufnahme für Werkzeuge mit einem Nutenschaft angeordnet sind. Die zweite Werkzeughalterung weist einen radial verschiebbaren Verriegelungskörper in der Form einer Verriegelungskugel auf, die in am Schaftende geschlossene Nuten der Werkzeuge einführbar ist und von einer in Grenzen axial beweglichen Sperrhülse und einer Haltehülse in ihrer Verriegelungsstellung gehalten wird. Die Sperrhülse ist über die Haltehülse mit einer Feder in Richtung ihrer Sperrstellung belastet. In der Verriegelungsstellung des Verriegelungskörpers überdeckt das Sperrelement die Kugel radial und die Haltehülse sichert die Kugel mit einem Vorsprung in axialer Richtung.From the EP 0 456 003 B1 is a beating hand drill with a rotationally driven tool holder known. The tool holder has a base body and a receiving bore arranged therein for drilling and striking tools, in which a jaw chuck as a first tool holder and a separate second tool holder for tools are arranged with a Nutenschaft. The second tool holder has a radially displaceable locking body in the form of a locking ball, which is insertable in the shaft end closed grooves of the tools and is held by a limited axially movable locking sleeve and a retaining sleeve in its locking position. The locking sleeve is loaded via the retaining sleeve with a spring in the direction of its blocking position. In the locking position of the locking body, the blocking element radially overlaps the ball and the holding sleeve secures the ball with a projection in the axial direction.

Beim Einschieben des Werkzeugs wird die Kugel durch das Schaftende des Werkzeugs in einem Längsschlitz in Einführrichtung verschoben. Dabei wird die Haltehülse an ihrem Vorsprung über die Kugel gegen die Feder verschoben. Zwischen dem Sperrelement und der Haltehülse entsteht ein Freiraum, in den die Kugel radial nach außen ausweichen kann. Das Werkzeug kann eingeführt werden. Anschließend verschiebt die vorgespannte Feder die Haltehülse in ihre Ausgangsstellung und drückt die Kugel in die Nut des Werkzeugs.When inserting the tool, the ball is moved by the shaft end of the tool in a longitudinal slot in the insertion direction. The retaining sleeve is moved at its projection on the ball against the spring. Between the locking element and the retaining sleeve creates a free space into which the ball can dodge radially outward. The tool can be introduced. Subsequently, the prestressed spring displaces the retaining sleeve into its initial position and presses the ball into the groove of the tool.

Zum Entnehmen des Werkzeugs wird mit einer Betätigungshülse das Sperrelement gegen die Haltehülse und gegen die die Haltehülse belastende Feder verschoben, so daß die Kugel radial nach außen ausweichen und das Werkzeug entnommen werden kann. Danach drückt die Feder die Haltehülse, das Sperrelement und die Kugel in ihre Ausgangsstellungen zurück.To remove the tool, the blocking element is moved with an actuating sleeve against the retaining sleeve and against the retaining sleeve loading spring, so that the ball dodge radially outward and the tool can be removed. Thereafter, the spring pushes the retaining sleeve, the locking element and the ball back to their original positions.

Ein gattungsgemäßer Vorrichtung ist auch aus US 4626146 A bekannt.A generic device is also off US 4626146 A known.

Vorteile der ErfindungAdvantages of the invention

Die Erfindung geht aus von einer Handwerkzeugmaschine, insbesondere von einem Bohrhammer, mit einer drehend angetriebenen Werkzeughalterung zur Aufnahme von Werkzeugen mit einem Nutenschaft, die zumindest einen radial verschiebbaren Verriegelungskörper aufweist, der in eine am Schaftende geschlossene Nut des Werkzeugs einführbar ist und von einem Sperrelement in seiner Verriegelungsstellung gehalten ist.The invention relates to a hand tool, in particular a hammer drill, with a rotationally driven tool holder for receiving tools with a Nutenschaft having at least one radially displaceable locking body which is insertable into a closed end of the shaft groove of the tool and of a blocking element in is held in its locking position.

Es wird vorgeschlagen, daß das Sperrelement in einer den Verriegelungskörper radial freigebenden Stellung durch eine Rastverbindung gehalten und über zumindest eine Feder in Richtung seiner Sperrstellung belastet ist. Es kann konstruktiv einfach eine zumindest teilautomatisierte Verriegelung mit besonders langen Verriegelungskörpern erreicht werden, indem eine axiale Bewegung der Verriegelungskörper vermeidbar ist. Ist das Sperrelement durch die Rastverbindung in der den Verriegelungskörper radial freigebenden Stellung gehalten, kann das Werkzeug eingeführt und entfernt werden, ohne daß der Verriegelungskörper axial verschoben werden muß. Durch lange Verriegelungskörper können Drehmitnahmeelemente eingespart oder vorteilhaft in ihrer Funktion unterstützt werden. Der Verschleiß an den Drehmitnahmeelementen kann reduziert und die Lebensdauer kann erhöht werden. Die das Sperrelement belastende Feder wird zudem vorteilhaft dazu genutzt, das Sperrelement in seiner Sperrstellung zu halten, wodurch zusätzliche Arretiermittel eingespart werden können.It is proposed that the blocking element is held in a locking body radially releasing position by a latching connection and is loaded via at least one spring in the direction of its blocking position. It can structurally simple an at least partially automated locking can be achieved with particularly long locking bodies by an axial movement of the locking body is avoidable. If the blocking element held by the locking connection in the locking body radially releasing position, the tool can be inserted and removed without the locking body must be moved axially. By long locking body rotational drive elements can be saved or advantageously supported in their function. The wear on the rotary driving elements can be reduced and the life can be increased. The spring loading the locking element is also advantageously used to hold the locking element in its locking position, whereby additional locking means can be saved.

Die Rastverbindung kann bei einer teilautomatisierten Verriegelung der Verriegelungskörper über ein Betätigungselement gelöst werden, beispielsweise über einen Druckknopf, der nach einem Einführen eines Werkzeugs betätigt wird. Vorteilhaft besitzt die Rastverbindung jedoch zumindest ein in der den Verriegelungskörper freigebenden Stellung des Sperrelements in einen Aufnahmebereich der Werkzeughalterung ragendes Bauteil, über das die Rastverbindung beim Einführen des Werkzeugs lösbar ist. Es kann ein hoher Komfort mit wenigen Bauteilen erreicht werden.The latching connection can be achieved in a partially automated locking of the locking body via an actuating element, for example via a push button, which is actuated after insertion of a tool. Advantageously, however, the latching connection has at least one in the locking body releasing position of the locking element in a receiving region of the tool holder projecting component, via which the latching connection during insertion of the tool is releasable. It can be achieved a high level of comfort with few components.

In einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, daß zumindest ein Teil der Werkzeughalterung zur Herstellung eines Leerlaufs bzw. einer Antriebsverbindung axial verschiebbar geführt ist und der Verriegelungskörper die Länge der Nut im Nutenschaft des Werkzeugs aufweist. Mit einem maximal langen Verriegelungskörper kann eine maximale Drehmomentübertragung erreicht werden.In a further embodiment of the invention it is proposed that at least a part of the tool holder for the manufacture of an idle or a drive connection is guided axially displaceable and the locking body has the length of the groove in the groove shank of the tool. With a maximum length of locking body maximum torque transmission can be achieved.

Ist das Sperrelement mit einer Ausnehmung über den Verriegelungskörper verdrehbar, kann axialer Bauraum eingespart und insbesondere kann mit einem kleinen Verstellweg ein langer Verriegelungskörper verriegelt oder freigegeben werden. Ein verkippen und/oder verkannten des Verriegelungskörpers kann sicher vermieden werden. Grundsätzlich ist jedoch auch möglich, daß das Sperrelement in axialer Richtung oder mit einer kombinierten Dreh- und Schiebebewegung in axialer Richtung in eine den Verriegelungskörper freigebende Stellung führbar ist.If the blocking element can be rotated with a recess over the locking body, axial space can be saved and, in particular, a long locking body can be locked or released with a small adjustment path. A tilting and / or misjudging the locking body can be safely avoided. In principle, however, it is also possible that the blocking element in the axial direction or with a combined rotary and sliding movement in the axial direction in a locking body releasing position is feasible.

Um gegenüber bekannten Handwerkzeugmaschinen eine gleichbleibende Bedienung sicherzustellen, ist vorteilhaft eine translatorische Entriegelungsbewegung eines Stellelements über ein Getriebe in eine rotatorische Bewegung übersetzt. Das Getriebe kann durch verschiedene, dem Fachmann als sinnvoll erscheinende konstruktive Lösungen realisiert werden, beispielsweise über ein Zahnstangengetriebe usw. Ist jedoch das Stellelement über ein Kurvengetriebe mit dem Sperrelement wirkungsmäßig verbunden, kann eine besonders kostengünstige und platzsparende Konstruktion erreicht werden. Dabei ist vorteilhaft ein Kurvenglied des Kurvengetriebes in einem Außenumfang des Sperrelements eingebracht. Zusätzliche Bauteile und Bauraum können eingespart werden.In order to ensure a constant operation compared to known hand tool machines, a translational unlocking movement of an actuating element is advantageously translated via a gear into a rotational movement. The transmission can be realized by various constructive solutions that appear reasonable to those skilled in the art, for example via a rack and pinion, etc. However, if the actuator is operatively connected to the locking element via a cam mechanism, a particularly cost-effective and space-saving design can be achieved. In this case, a cam member of the cam gear in an outer periphery is advantageous introduced the blocking element. Additional components and installation space can be saved.

In einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, daß das Stellelement über eine Mitnahmehülse mit dem Sperrelement verbunden ist, wodurch zusätzliche Freiheitsgrade geschaffen werden können. Ist die Mitnahmehülse in Richtung der Sperrstellung des Sperrelements drehfest und in Richtung der freigebenden Stellung des Sperrelements drehbar mit dem Stellelement verbunden, kann mit dem Stellelement über die Mitnahmehülse zum Entriegeln des Verriegelungskörpers ein Stellmoment übertragen werden. Ferner kann erreicht werden, daß während des Betriebs sich die Mitnahmehülse bei Kontakt des Stellelements mit einem Gegenstand, beispielsweise mit einem Mauerwerk, im Stellelement drehen kann. Das Stellelement kann bei Kontakt mit einem Gegenstand bei rotierender Werkzeughalterung festgehalten und ein Verschleiß des Stellelements kann weitgehend vermieden werden.In a further embodiment of the invention it is proposed that the actuating element is connected via a driving sleeve with the blocking element, whereby additional degrees of freedom can be created. If the driving sleeve rotatably in the direction of the locking position of the locking element and rotatably connected in the direction of the releasing position of the locking element with the actuating element, a control torque can be transmitted to the actuating element via the driving sleeve for unlocking the locking body. Furthermore, it can be achieved that during operation, the driving sleeve can rotate upon contact of the actuating element with an object, for example with a masonry, in the adjusting element. The actuator can be held in contact with an object with rotating tool holder and wear of the actuator can be largely avoided.

Der Verriegelungskörper kann verschiedene, dem Fachmann als sinnvoll erscheinende Bauformen aufweisen, insbesondere kann die Bauform gezielt auf eine hohe Drehmomentübertragung ausgelegt werden, beispielsweise mit einem trapezförmigen Querschnitt usw. Um jedoch möglichst Standardwerkzeuge verwenden zu können, ist der Verriegelungskörper vorteilhaft von einer Walze gebildet, die zudem besonders kostengünstig hergestellt werden kann.The locking body may have various designs that appear appropriate to those skilled in the art, in particular, the design can be designed specifically for a high torque transmission, for example with a trapezoidal cross section, etc. However, in order to use standard tools as possible, the locking body is advantageously formed by a roller, the In addition, can be produced particularly inexpensive.

Zeichnungdrawing

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Es zeigen:

Fig. 1
einen Längsschnitt einer Werkzeughalterung beim Einführen eines Werkzeugschafts,
Fig. 2
einen Schnitt entlang der Linie II-II in Fig. 1,
Fig. 3
der Werkzeughalter nach Fig. 1 nach einem Einführen des Werkzeugschafts und
Fig. 4
eine Explosionszeichnung der Werkzeughalterung aus Fig. 1.
Show it:
Fig. 1
a longitudinal section of a tool holder during insertion of a tool shank,
Fig. 2
a section along the line II-II in Fig. 1,
Fig. 3
the tool holder of FIG. 1 after insertion of the tool shaft and
Fig. 4
an exploded view of the tool holder of FIG. 1.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Fig. 1 ist eine Werkzeughalterung 10 einer Schlagbohrmaschine zur Aufnahme von Werkzeugen mit einem Nutenschaft 12 im Längsschnitt dargestellt. Die Werkzeughalterung 10 besitzt einen Grundkörper 54, auf dem zu einer Bearbeitungsseite über einen Spannring 56 und über einen Haltering 58 eine Gummikappe 60 befestigt ist. Im Grundkörper 54 sind in Ausnehmungen 62, 64 zwei radial verschiebbare Verriegelungskörper 14, 16 angeordnet, die jeweils in eine am Schaftende 18 geschlossene Nut 20, 108 der Werkzeuge einführbar sind und von einer entsperrbaren Sperrhülse 22 in ihrer Verriegelungsstellung gehalten sind (Fig. 3).In Fig. 1, a tool holder 10 of a percussion drill for receiving tools with a Nutenschaft 12 is shown in longitudinal section. The tool holder 10 has a base body 54, on which a rubber cap 60 is attached to a processing side via a clamping ring 56 and a retaining ring 58. In the main body 54 are in recesses 62, 64, two radially displaceable locking body 14, 16th arranged, which are each insertable into a groove 20, 108 of the tools closed on the shaft end 18 and are held in their locking position by a releasable locking sleeve 22 (FIG. 3).

Erfindungsgemäß ist die Sperrhülse 22 in ihrer die Verriegelungskörper 14, 16 freigebenden Stellung über eine Rastverbindung 28 gehalten und über eine Drehfeder 30 in Richtung 44 ihrer Sperrstellung belastet (Fig. 1, 2 und 4), wobei die Sperrhülse 22 zur Entriegelung der Verriegelungskörper 14, 16 mit jeweils einer Ausnehmung 24, 26 über die Verriegelungskörper 14, 16 drehbar ist. Die Drehfeder 30 ist an einem ersten Ende in Drehrichtung über einen in eine Nut 90 des Grundkörpers 54 greifenden Vorsprung 92 drehfest und in axialer Richtung über eine Hülse 66 abgestützt und greift formschlüssig an einem zweiten Ende mit einem Vorsprung 68 in eine Ausnehmung 70 der Sperrhülse 22. Die Sperrhülse 22 ist in ihrem Drehwinkel durch eine Kugel 102 begrenzt, die in einer Nut 104 im Grundkörper 54 und in einer Ausnehmung 106 in der Sperrhülse 22 geführt ist (Fig. 2).According to the invention, the locking sleeve 22 is held in its position releasing the locking bodies 14, 16 via a latching connection 28 and loaded via a torsion spring 30 in the direction 44 of its blocking position (FIGS. 1, 2 and 4), wherein the locking sleeve 22 for unlocking the locking bodies 14, 16 with a respective recess 24, 26 on the locking body 14, 16 is rotatable. The torsion spring 30 is rotationally fixed at a first end in the direction of rotation via a projection 92 engaging in a groove 90 of the base body and supported in the axial direction by a sleeve 66 and engages positively with a projection 68 in a recess 70 of the locking sleeve 22 at a second end The locking sleeve 22 is limited in its angle of rotation by a ball 102, which is guided in a groove 104 in the base body 54 and in a recess 106 in the locking sleeve 22 (FIG.

Die Rastverbindung 28 besitzt einen Stift 34, der in der die Verriegelungskörper 14, 16 freigebenden Stellung der Sperrhülse 22 in einen Aufnahmebereich 32 der Werkzeughalterung 10 ragt. Über den Stift 34 ist die Rastverbindung 28 beim Einführen des Werkzeugs lösbar. Der Stift 34 greift in seiner Verriegelungsstellung (Fig. 1) mit einem Vorsprung 72 formschlüssig in eine Ausnehmung 74 der Sperrhülse 22. Der Stift 34 ist in radialer Richtung nach innen über eine Ringfeder 76 belastet, gegen die der Stift 34 beim Lösen der Rastverbindung 28 durch den Werkzeugschaft 12 radial nach außen verschoben werden kann.The latching connection 28 has a pin 34 which protrudes in the locking body 14, 16 releasing position of the locking sleeve 22 in a receiving area 32 of the tool holder 10. About the pin 34, the locking connection 28 during insertion of the tool is releasable. The pin 34 engages in its locking position (Fig. 1) with a projection 72 positively into a recess 74 of the locking sleeve 22. The pin 34 is loaded in the radial direction inwardly via an annular spring 76, against which the pin 34 when loosening the Locking connection 28 can be moved radially outwardly through the tool shank 12.

Die Werkzeughalterung 10 ist zur Herstellung eines Leerlaufs bzw. einer Antriebsverbindung axial verschiebbar geführt und die als Walzen ausgebildeten Verriegelungskörper 14, 16 besitzen die Länge der Nuten 20, 108 im Nutenschaft 12 (Fig. 3).The tool holder 10 is axially displaceably guided for producing an idling or a drive connection and the locking bodies 14, 16 designed as rollers have the length of the grooves 20, 108 in the slot shaft 12 (FIG. 3).

Die Sperrhülse 22 ist über ein Kurvengetriebe 38 mit einer Mitnahmehülse 42 verbunden, wobei ein Kurvenglied 40 des Kurvengetriebes 38 in der Form einer schräg verlaufenden Nut in einem Außenumfang der Sperrhülse 22 eingebracht ist, in der an die Mitnahmehülse 42 angeformte Vorsprünge 52 geführt sind. Die Mitnahmehülse 42 ist in axialer Richtung über einen Anschlag 48 mit einer Stellhülse 36 verbunden, wobei die Mitnahmehülse 42 mit einer Schraubenfeder 78 mit dem Anschlag 48 gegen einen sich radial nach innen erstreckenden Bund 80 der Stellhülse 36 gedrückt ist. Die Schraubenfeder 78 ist dabei über einen Ring 84 an einem Absatz 86 des Grundkörpers 54 abgestützt, wobei der Ring 84 einen Federraum 110 der Schraubenfeder 78 über eine Dichtung 88 radial an der Stellhülse 36 nach außen abdichtet.The locking sleeve 22 is connected via a cam mechanism 38 with a driving sleeve 42, wherein a cam member 40 of the cam gear 38 is introduced in the form of an obliquely extending groove in an outer periphery of the locking sleeve 22, are guided in the integrally formed on the driving sleeve 42 projections 52. The driving sleeve 42 is connected in the axial direction via a stop 48 with a setting sleeve 36, wherein the driving sleeve 42 is pressed with a coil spring 78 with the stopper 48 against a radially inwardly extending collar 80 of the adjusting sleeve 36. The coil spring 78 is supported via a ring 84 on a shoulder 86 of the base body 54, wherein the ring 84 seals a spring chamber 110 of the coil spring 78 via a seal 88 radially on the adjusting sleeve 36 to the outside.

In Drehrichtung ist die Mitnahmehülse 42 in Richtung 44 der Sperrstellung der Sperrhülse 22 mit der Stellhülse 36 drehfest über eine an den Anschlag 48 angeformte Verzahnung 50 verbunden, die in an die Stellhülse 36 angeformte Vorsprünge 82 eingreift (Fig. 4). In Richtung 46 der freigebenden Stellung sind die Stellhülse 36 und die Mitnahmehülse 42 drehbar miteinander verbunden, und zwar kann die Verzahnung 50 in Richtung 46 der freigebenden Stellung über die Vorsprünge 82 gleiten. Kommt während des Betriebs die Stellhülse 36 beispielsweise mit einem Mauerwerk in Kontakt, kann sich die Mitnahmehülse 42 relativ zur Stellhülse 36 drehen, wobei die dargestellte Ausführung für ein sich gegen den Uhrzeigersinn drehendes Werkzeug ausgelegt ist.In the direction of rotation, the driving sleeve 42 in the direction 44 of the locking position of the locking sleeve 22 with the adjusting sleeve 36 rotatably connected via an integrally formed on the stop 48 teeth 50, which engages molded into the adjusting sleeve 36 projections 82 (Fig. 4). In the direction 46 of the releasing position, the adjusting sleeve 36 and the driving sleeve 42 are rotatably connected to each other, namely, the toothing 50 in Slide 46 of the releasing position over the protrusions 82. If, during operation, the adjusting sleeve 36, for example, with a masonry in contact, the driving sleeve 42 can rotate relative to the adjusting sleeve 36, wherein the illustrated embodiment is designed for a counter-clockwise rotating tool.

Bevor ein Werkzeug eingeschoben wird, ist die Sperrhülse 22 durch die Rastverbindung 28 in ihrer freigebenden Stellung gehalten. Beim Einschieben des Werkzeugs, werden die Verriegelungskörper 14, 16 durch das Schaftende 18 radial nach außen in die Ausnehmungen 24, 26 geschoben (Fig. 1 und 2). Befinden sich die Verriegelungskörper 14, 16 nach weiterem Einschieben des Werkzeugs über den Nuten 20, 108, wird mit dem Schaftende 18 der Stift 34 radial nach außen gegen die Ringfeder 76 gedrückt. Der Vorsprung 72 des Stifts 34 wird aus der Ausnehmung verschoben, die Sperrhülse 22 wird durch die Drehfeder 30 verdreht und fixiert die Verriegelungskörper 14, 16 in radialer Richtung in den Nuten 20, 108 des Nutenschafts 12 (Fig. 3). Beim Einschieben des Werkzeugs werden zudem Drehmitnahmeelemente 94, 96 in zum Schaftende 18 offene Längsnuten 98, 100 eingeführt.Before a tool is inserted, the locking sleeve 22 is held by the locking connection 28 in its releasing position. When inserting the tool, the locking body 14, 16 are pushed by the shaft end 18 radially outwardly into the recesses 24, 26 (FIGS. 1 and 2). Are the locking body 14, 16 after further insertion of the tool on the grooves 20, 108, is pressed with the shaft end 18 of the pin 34 radially outwardly against the annular spring 76. The projection 72 of the pin 34 is displaced out of the recess, the locking sleeve 22 is rotated by the torsion spring 30 and fixes the locking bodies 14, 16 in the radial direction in the grooves 20, 108 of the grooved shaft 12 (FIG. 3). When inserting the tool also Drehitnahmeelemente 94, 96 in the shaft end 18 open longitudinal grooves 98, 100 are introduced.

Beim Entfernen des Werkzeugs wird die Stellhülse 36 mit der Mitnahmehülse 42 mit einer translatorischen Bewegung axial in Richtung der Schlagbohrmaschine gegen die Schraubenfeder 78 gezogen. Die translatorische Bewegung wird über das Kurvengetriebe 38 in eine rotatorische Bewegung übersetzt und auf die Sperrhülse 22 übertragen. Die Mitnahmehülse 42 ist dabei über die Verzahnung 50 in Richtung 44 der Sperrstellung an der Stellhülse 36 abgestützt. Die Sperrhülse 22 dreht sich mit den Ausnehmungen 24, 26 über die Verriegelungskörper 14, 16. Der Stift 34 wird durch die Ringfeder 76 mit seinem Vorsprung 72 in die Ausnehmung 74 gedrückt und hält die Sperrhülse 22 in ihrer freigebenden Stellung. Wird anschließend das Werkzeug mit seinem Nutenschaft 12 in axialer Richtung aus dem Aufnahmebereich 32 gezogen, werden die Verriegelungskörper 14, 16 durch das Schaftende 18 radial nach außen in die Ausnehmungen 24, 26 gedrückt.When removing the tool, the adjusting sleeve 36 is pulled with the driving sleeve 42 with a translational movement axially in the direction of the impact drill against the coil spring 78. The translational movement is translated via the cam gear 38 in a rotational movement and transmitted to the locking sleeve 22. The driving sleeve 42 is supported via the toothing 50 in the direction 44 of the locking position on the adjusting sleeve 36. The locking sleeve 22 rotates The pin 34 is pressed by the annular spring 76 with its projection 72 into the recess 74 and holds the locking sleeve 22 in its releasing position. If the tool with its groove shank 12 is subsequently pulled out of the receiving region 32 in the axial direction, the locking bodies 14, 16 are pressed radially outwardly into the recesses 24, 26 by the shank end 18.

Bezugszeichenreference numeral

1010
Werkzeughalterungtool holder
1212
Nutenschaftgrooved shank
1414
Verriegelungskörperlocking body
1616
Verriegelungskörperlocking body
1818
Schaftendeshank end
2020
Nutgroove
2222
Sperrelementblocking element
2424
Ausnehmungrecess
2626
Ausnehmungrecess
2828
Rastverbindunglocking connection
3030
Federfeather
3232
Aufnahmebereichreception area
3434
Bauteilcomponent
3636
Stellelementactuator
3838
Getriebetransmission
4040
Kurvengliedcam member
4242
Mitnahmehülsedriver sleeve
4444
Richtungdirection
4646
Richtungdirection
4848
Anschlagattack
5050
Verzahnunggearing
5252
Vorsprunghead Start
5454
Grundkörperbody
5656
Spannringclamping ring
5858
Halteringretaining ring
6060
Gummikapperubber cap
6262
Ausnehmungrecess
6464
Ausnehmungrecess
6666
Hülseshell
6868
Vorsprunghead Start
7070
Ausnehmungrecess
7272
Vorsprunghead Start
7474
Ausnehmungrecess
7676
RingfederRingfeder
7878
Schraubenfedercoil spring
8080
BundFederation
8282
Vorsprüngeprojections
8484
Ringring
8686
Absatzparagraph
8888
Dichtungpoetry
9090
Nutgroove
9292
Vorsprunghead Start
9494
DrehmitnahmeelementRotationally driving element
9696
DrehmitnahmeelementRotationally driving element
9898
Längsnutlongitudinal groove
100100
Längsnutlongitudinal groove
102102
KugelBullet
104104
Nutgroove
106106
Ausnehmungrecess
108108
Nutgroove
110110
Federraumspring chamber

Claims (10)

  1. Hand held power tool, in particular hammer drill, with a rotatingly driven tool fixture (10) which is intended for receiving tools, has a grooved shank (12) and has at least one radially displaceable locking body (14, 16), which can be introduced into a groove (20, 108) of the tool, which groove is closed at the shank end (18), and which locking body is retained in its locking position by a blocking element (22), characterized in that the blocking element (22) is retained in a position radially releasing the locking body (14, 16) by means of a latching connection (28) and is loaded in the direction (44) of its blocking position via at least one spring (30).
  2. Hand held power tool according to Claim 1, characterized in that the latching connection (28) has at least one component (34) which, in the position of the blocking element (22) that releases the locking body (14, 16), protrudes into a receiving region (32) of the tool fixture (10) and via which the latching connection (28) can be released when the tool is introduced.
  3. Hand held power tool according to Claim 1 or 2, characterized in that at least part of the tool fixture (10) is guided in an axially displaceable manner in order to produce idle running or a driving connection, and the locking body (14, 16) is the same length as the groove (20, 108) in the grooved shank (12).
  4. Hand held power tool according to one of the preceding claims, characterized in that the blocking element (22) can be rotated with a recess (24, 26) over the locking body (14, 16).
  5. Hand held power tool according to Claim 4, characterized in that a translatory unlocking movement of an adjusting element (36) is converted into a rotatory movement via a mechanism (38).
  6. Hand held power tool according to Claim 5, characterized in that the adjusting element (36) is connected in terms of action to the blocking element (22) via a cam mechanism (38).
  7. Hand held power tool according to Claim 6, characterized in that a cam member (40) of the cam mechanism (38) is inserted into an outer circumference of the blocking element (22).
  8. Hand held power tool according to Claim 6 or 7, characterized in that the adjusting element (36) is connected to the blocking element (22) via a carry-along sleeve (42).
  9. Hand held power tool according to Claim 8, characterized in that the carry-along sleeve (42) is connected to the adjusting element (36) in a rotationally fixed manner in the direction (44) of the blocking position of the blocking element (22) and in a rotatable manner in the direction (46) of that position of the blocking element (22) which releases the locking body (14, 16).
  10. Hand held power tool according to one of the preceding claims, characterized in that the locking body (14, 16) is formed by a roller.
EP20000124983 1999-12-17 2000-11-16 Hand held power tool Expired - Lifetime EP1108504B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999160951 DE19960951A1 (en) 1999-12-17 1999-12-17 Hand tool
DE19960951 1999-12-17

Publications (2)

Publication Number Publication Date
EP1108504A1 EP1108504A1 (en) 2001-06-20
EP1108504B1 true EP1108504B1 (en) 2007-06-13

Family

ID=7933064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000124983 Expired - Lifetime EP1108504B1 (en) 1999-12-17 2000-11-16 Hand held power tool

Country Status (2)

Country Link
EP (1) EP1108504B1 (en)
DE (2) DE19960951A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2395158B (en) 2002-11-14 2005-11-16 Black & Decker Inc Tool holder for a rotary hammer

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3414300A1 (en) * 1984-04-16 1985-10-24 Hilti Ag, Schaan TOOL HOLDER FOR DRILLING AND CHISEL DEVICES
DE4104131A1 (en) * 1990-05-08 1991-11-14 Bosch Gmbh Robert HAND DRILLING MACHINE
JP3606021B2 (en) * 1996-12-13 2005-01-05 日立工機株式会社 Impact tool

Also Published As

Publication number Publication date
EP1108504A1 (en) 2001-06-20
DE19960951A1 (en) 2001-06-28
DE50014406D1 (en) 2007-07-26

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