EP0195193B1 - Chuck for percussive-rotary or rotary drilling - Google Patents

Chuck for percussive-rotary or rotary drilling Download PDF

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Publication number
EP0195193B1
EP0195193B1 EP86100971A EP86100971A EP0195193B1 EP 0195193 B1 EP0195193 B1 EP 0195193B1 EP 86100971 A EP86100971 A EP 86100971A EP 86100971 A EP86100971 A EP 86100971A EP 0195193 B1 EP0195193 B1 EP 0195193B1
Authority
EP
European Patent Office
Prior art keywords
chuck
drilling
ring
coupling ring
axially
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
Application number
EP86100971A
Other languages
German (de)
French (fr)
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EP0195193A1 (en
Inventor
Günter Horst Röhm
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0195193A1 publication Critical patent/EP0195193A1/en
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Publication of EP0195193B1 publication Critical patent/EP0195193B1/en
Expired legal-status Critical Current

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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
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17615—Obliquely guided reciprocating jaws
    • Y10T279/17623—Threaded sleeve and jaw
    • Y10T279/17632—Conical sleeve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/94—Tool-support
    • Y10T408/95—Tool-support with tool-retaining means
    • Y10T408/953—Clamping jaws

Definitions

  • the invention relates to a percussion drilling device with a drill chuck that can be driven by a drill spindle, in particular a drill chuck that has an axial passage through which the impact action of a striker axially guided in the hollow boron spindle on the end of the chuck jaws that can be adjusted centrally in the drill chuck by an adjusting ring held drill is transferable, with at least one coupling member being provided for the rotational connection of the drill chuck to the drill spindle, which engages positively in the coupling receptacles on the one hand the drill spindle and on the other hand the chuck body and enables the drill chuck on the drill spindle to be displaced axially by a locking device with a coupling ring can be switched off.
  • a percussion drilling device of this type in which the locking device is formed by a ring which is rotatably and axially immovably guided on the chuck body.
  • the ring is arranged axially next to an annular shoulder of the drilling spindle and carries stop projections which are directed against the annular shoulder and which, in the stop on the annular surface of the annular shoulder, switch off the axial displacement play of the chuck on the drilling spindle.
  • this locking device is provided in particular for impact drilling devices in which the axial displacement play has only a small stroke. If, on the other hand, the drill chuck is to have a large stroke, such as how the drill itself can, the overall length of the drill chuck in this locking device is extended approximately with its stroke length.
  • undesirable operating conditions can occur in the known percussion drilling device, namely that the percussion ring is not locked in percussion drilling operation when the displacement play is switched on, or is blocked for normal drilling operation when the displacement play is switched off, that is to say cannot be actuated for tensioning drills.
  • the invention has for its object to design and improve a percussion drilling device of the type mentioned in such a way that the drill chuck can carry out an axial displacement play with a large stroke without increasing its overall length and that, depending on the actuating position of the adjusting ring, either the clamping ring can be freely rotated if that axial displacement play is switched off or the clamping ring is blocked in its direction of rotation if the axial displacement play is switched on for percussion drilling.
  • the locking device has a radially adjustable locking member guided in the chuck body, which protrudes into an axially extending groove in the drill spindle and through an adjusting sleeve which surrounds the chuck body and is rotatable about the latter in an arranged in the groove Recess for locking the axial displacement play is conceivable, the adjusting sleeve having a radially outward recess enabling the locking member to emerge from the recess and being carried in the direction of rotation by the axially displaceable and lockable coupling ring, and that the coupling ring on its the adjusting ring facing edge is provided with teeth which engage in an associated counter toothing of the adjusting ring when the coupling ring is in the axial position on the drill.
  • the groove can also be designed as an annular groove, for example.
  • the groove is formed by a longitudinal groove, which is closed at the end in each case and is adapted to the length of the axial displacement, the recess being pocket-like at the end of the longitudinal groove facing away from the chuck jaws.
  • the coupling member effecting the rotational connection of the drill chuck to the drilling spindle.
  • the adjusting sleeve is firmly connected to a telescopic ring which surrounds it and is axially immovable relative to the chuck body and which is in non-rotatable engagement with the coupling ring.
  • the coupling ring in its displacement direction is under the force of a spring which is supported against the telescopic ring or the adjusting sleeve
  • the chuck body has at least one stop head for which one of two is in the wall of the coupling ring juxtaposed, different length axial grooves existing recess is provided, the grooves on the side facing the collar are open for the entry of the stop head and for which the coupling ring on the chuck body is rotatable so that either one or the other of the two grooves with the Stop head aligned axially.
  • the percussion drilling device shown in the drawing consists of a drilling spindle 1, only partially shown, which rotatably drives a drill chuck 2.
  • This drill chuck 2 has an axial passage 3, through which the impact of a striker 4 axially guided in the hollow drilling spindle and also only partially shown on the end of a chuck jaw 5 held in the chuck 2 between the jaws 5, which can be adjusted centrally by an adjusting ring 20, but in the drawing not shown drill is transferable.
  • coupling members 6 are provided which engage in a form-fitting manner in the rotational direction in coupling receptacles 8, 9 provided on the chuck body 7 and on the drilling spindle 1.
  • the locking device has a radially adjustable locking member 29 guided in the chuck body 7.
  • the locking member 29 projects into a groove 30 which extends axially in the drilling spindle 1 and in which a recess 32 is arranged.
  • the locking member 29 is conceivable by enclosing the chuck body 7 and about this rotatable adjusting sleeve 31 to lock the axial play in the recess 32.
  • the adjusting sleeve 31 has a recess 33, which allows the locking member 29 to emerge from the recess 32 and is directed radially outwards.
  • the adjusting sleeve 31 is carried in the direction of rotation by the axially displaceable and lockable coupling ring 12.
  • the groove 30 is formed by a longitudinal groove which is closed at each end, the length of which is adapted to the axial displacement play.
  • the recess 32 is pocket-like at the end of the longitudinal groove facing away from the chuck jaws 5.
  • the adjusting sleeve 31 is firmly connected to a telescopic ring 35 which surrounds it and is axially immovable relative to the chuck body 7 by means of a ring 34.
  • the telescopic ring is in rotationally fixed engagement with the coupling ring 12, as a result of which the coupling ring 12 remains axially freely adjustable, but takes the telescopic ring 35 with it when it is rotated.
  • the locking member 29, which is designed as a ball, is located in the recess 33 of the adjusting sleeve 31, ie it has emerged from the recess 32 in the groove 30.
  • the chuck body 7 can carry out an axial displacement play with respect to the drilling spindle 1, the locking member 29 moving in the longitudinal direction of the groove 30.
  • the coupling ring 12 is adjusted in its direction of rotation, the locking member 29 is adjusted radially inward into the recess 32 via the telescopic ring 35 and the adjusting sleeve 31 through the bevel 37 adjoining the recess 33, as a result of which the axial displacement play of the chuck body 7 is switched off.
  • the coupling ring 12 is provided on its edge facing the adjusting ring 20 with teeth 21 which engage in an associated counter-toothing 22 of the adjusting ring 20 when the coupling ring 12 is in the axial position on the drill.
  • the coupling ring 12 is in its direction of displacement under the force of a spring 23 which, in the embodiment according to FIGS.
  • the chuck body 7 has at least one stop head 24, for which a recess is provided in the wall of the coupling ring 12, which consists of two axial grooves 25.1, 25.2 of different lengths running next to one another.
  • the grooves 25.1, 25.1 are open on the side facing the adjusting ring 20 for the entry of the stop head 24.
  • the coupling ring 12 can be rotated on the chuck body 7 so that either one or the other of the two grooves 25.1, 25.2 is axially aligned with the stop head 24.
  • the stop head 24 itself is elongated in the longitudinal direction of the grooves 25.1, 25.2 in a web-like manner and forms stop surfaces for the groove side walls with its web longitudinal sides.
  • the stop head forms the end of a pin which is inserted radially into a bore in the chuck body 7 and anchors the stop head 24 on the chuck body 7.
  • the drill chuck 2 shows a largely customary structure.
  • the centrally adjustable clamping jaws 5 are guided in the chuck body 7, the adjusting ring 20, which is rotatable but axially immovable on the chuck body 7 and serves with its internal thread, engages in a toothing of the clamping jaws 5.
  • the adjusting ring 20 itself has a ring gear 26 for engaging the toothed pinion 27 of a clamping key 28 which can be attached to the chuck 2 for clamping or releasing.

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

Description

Die Erfindung betrifft eine Schlagbohreinrichtung mit einem von einer Bohrspindel antreibbaren Bohrfutter, insbes. einem Bohrfutter, das einen axialen Durchgang aufweist, durch den hindurch die Schlagwirkung eines in der hohlen Borspindel axial geführten Döppers auf das Ende des im Bohrfutter zwischen zentrisch durch einen Stellring verstellbaren Futterbacken gehaltenen Bohrers übertragbar ist, wobei zur drehschlüssigen Verbindung des Bohrfutters mit der Bohrspindel zumindest ein Kupplungsglied vorgesehen ist, das formschlüssig in Kupplungsaufnahmen einerseits der Bohrspindel, andererseits des Futterkörpers greift und dem Bohrfutter auf der Bohrspindel ein axiales Verschiebungsspiel ermöglicht, das durch eine Verriegelungseinrichtung mit einem Kupplungsring ausschaltbar ist.The invention relates to a percussion drilling device with a drill chuck that can be driven by a drill spindle, in particular a drill chuck that has an axial passage through which the impact action of a striker axially guided in the hollow boron spindle on the end of the chuck jaws that can be adjusted centrally in the drill chuck by an adjusting ring held drill is transferable, with at least one coupling member being provided for the rotational connection of the drill chuck to the drill spindle, which engages positively in the coupling receptacles on the one hand the drill spindle and on the other hand the chuck body and enables the drill chuck on the drill spindle to be displaced axially by a locking device with a coupling ring can be switched off.

Das Prioritätsdokument DE-A-3 509 165 ist für diese und die EPA0194426 beansprucht worden.Priority document DE-A-3 509 165 has been claimed for this and EPA0194426.

In der nach dem Prioritätsdatum veröffentlichten deutschen Patentanmeldung DE-A-34 13 581, ist eine Schlagbohreinrichtung dieser Art beschrieben, bei der die Verriegelungsvorrichtung von einem am Futterkörper drehbar und axial unverschiebbar geführten Ring gebildet ist. Der Ring ist axial neben einer Ringschulter der Bohrspindel angeordnet und trägt gegen die Ringschulter gerichtete Anschlagvorsprünge, die im Anschlag an der Ringfläche der Ringschulter das axiale Verschiebungsspiel des Bohrfutters auf der Bohrspindel ausschalten. In der Ringfläche der Ringschulter befinden sich Anschlagaussparungen, in welche die Anschlagvorsprünge mindestens bis zur Tiefe des axialen Verschiebungsspiels des Bohrfutters hineinpassen. Wird daher der Ring so verdreht, daß die Anschlagvorsprünge mit den Anschlagaussparungen zur Deckung kommen, können die Anschlagvorsprünge in die Anschlagaussparungen eintreten und das Verschiebungsspiel des Bohrfutters auf der Bohrspindel freigeben. Somit muß die Bohrspindel mit den Anschlagvorsprüngen des jeweiligen Futters entsprechenden Anschlagaussparungen versehen sein. Ferner ist diese Verriegelungsvorrichtung insbesondere für solche Schlagbohreinrichtungen vorgesehen, bei denen das axiale Verschiebungsspiel nur einen geringen Hub aufweist. Soll das Bohrfutter dagegen einen großen Hub, etwa wie der Bohrer selbst ausführen können, so verlängert sich bei dieser Verriegelungsvorrichtung die Baulänge des Bohrfutters etwa mit dessen Hublänge. Schließlich können bei der bekannten Schlagbohreinrichtung an sich unerwünschte Betriebszustände auftreten, daß nämlich im Schlagbohrbetrieb bei eingeschaltetem Verschiebungsspiel der Stellring nicht gesperrt ist bzw. bei ausgeschaltetem Verschiebungsspiel für normalen Bohrbetrieb der Stellring gesperrt, also zum Spannen von Bohrern nicht betätigbar ist.In the German patent application DE-A-34 13 581 published after the priority date, a percussion drilling device of this type is described in which the locking device is formed by a ring which is rotatably and axially immovably guided on the chuck body. The ring is arranged axially next to an annular shoulder of the drilling spindle and carries stop projections which are directed against the annular shoulder and which, in the stop on the annular surface of the annular shoulder, switch off the axial displacement play of the chuck on the drilling spindle. There are stop cut-outs in the ring surface of the ring shoulder, into which the stop projections fit at least to the depth of the axial displacement play of the drill chuck. Therefore, if the ring is rotated so that the stop projections come into congruence with the stop recesses, the stop projections can enter the stop recesses and release the displacement play of the drill chuck on the drill spindle. Thus, the drilling spindle must be provided with stop cut-outs corresponding to the stop projections of the respective chuck. Furthermore, this locking device is provided in particular for impact drilling devices in which the axial displacement play has only a small stroke. If, on the other hand, the drill chuck is to have a large stroke, such as how the drill itself can, the overall length of the drill chuck in this locking device is extended approximately with its stroke length. Finally, undesirable operating conditions can occur in the known percussion drilling device, namely that the percussion ring is not locked in percussion drilling operation when the displacement play is switched on, or is blocked for normal drilling operation when the displacement play is switched off, that is to say cannot be actuated for tensioning drills.

Der Erfindung liegt die Aufgabe zugrunde, eine Schlagbohreinrichtung der eingangs genannten Art so auszubilden und zu verbessern, daß das Bohrfutter ohne Vergrößerung seiner Baulänge ein axiales Verschiebungsspiel mit großem Hub ausführen kann und daß je nach Betätigungsstellung des Stellrings entweder der Spannring frei drehbar ist, wenn das axiale Verschiebungsspiel ausgeschaltet ist oder der Spannring in seiner Drehrichtung gesperrt ist, wenn das axiale Verschiebungsspiel für den Schlagbohrbetrieb eingeschaltet ist.The invention has for its object to design and improve a percussion drilling device of the type mentioned in such a way that the drill chuck can carry out an axial displacement play with a large stroke without increasing its overall length and that, depending on the actuating position of the adjusting ring, either the clamping ring can be freely rotated if that axial displacement play is switched off or the clamping ring is blocked in its direction of rotation if the axial displacement play is switched on for percussion drilling.

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß die Verriegelungsvorrichtung ein radial verstellbares, im Futterkörper geführtes Sperrglied aufweist, das in eine sich in der Bohrspindel axial erstreckende Nut vorsteht und durch eine den Futterkörper umschließende und um diesen drehbare Stellhülse in eine in der Nut angeordnete Vertiefung zur Sperrung des axialen Verschiebungsspiels vorstellbar ist, wobei die Stellhülse eine den Austritt des Sperrglieds aus der Vertiefung ermöglichende, radial auswärts gerichtete Aussparung aufweist und in Drehrichtung von dem axial verschiebbaren und gegen Drehung feststellbaren Kupplungsring mitgenommen wird, und daß der Kupplungsring an seinem dem Stellring zugewandten Rand mit Zähnen versehen ist, die bei axial bohrerseitiger Stellung des Kupplungsrings in eine zugeordnete Gegenverzahnung des Stellrings eingreifen. Die Nut kann dabei beispielsweise auch als Ringnut ausgeführt sein. In bevorzugter Ausführungsform der Erfindung ist die Nut jedoch von einer jeweils endseitig geschlossenen Längsnut mit dem axialen Verschiebungsspiel angepaßter Länge gebildet, wobei die Vertiefung am den Futterbacken abgewandten Ende der Längsnut taschenartig ausgebildet ist. Dadurch besteht auch die Möglichkeit, auf das die drehschlüssige Verbindung des Bohrfutters mit der Bohrspindel bewirkende Kupplungsglied zu verzichten. Weiter ist es von Vorteil, wenn die Stellhülse fest mit einem sie umschließenden, gegenüber dem Futterkörper axial unverschiebbaren Teleskopring verbunden ist, der mit dem Kupplungsring in drehfestem Eingriff steht.This object is achieved according to the invention in that the locking device has a radially adjustable locking member guided in the chuck body, which protrudes into an axially extending groove in the drill spindle and through an adjusting sleeve which surrounds the chuck body and is rotatable about the latter in an arranged in the groove Recess for locking the axial displacement play is conceivable, the adjusting sleeve having a radially outward recess enabling the locking member to emerge from the recess and being carried in the direction of rotation by the axially displaceable and lockable coupling ring, and that the coupling ring on its the adjusting ring facing edge is provided with teeth which engage in an associated counter toothing of the adjusting ring when the coupling ring is in the axial position on the drill. The groove can also be designed as an annular groove, for example. In a preferred embodiment of the invention, however, the groove is formed by a longitudinal groove, which is closed at the end in each case and is adapted to the length of the axial displacement, the recess being pocket-like at the end of the longitudinal groove facing away from the chuck jaws. As a result, there is also the possibility of dispensing with the coupling member effecting the rotational connection of the drill chuck to the drilling spindle. It is also advantageous if the adjusting sleeve is firmly connected to a telescopic ring which surrounds it and is axially immovable relative to the chuck body and which is in non-rotatable engagement with the coupling ring.

Eine ebenfalls vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß der Kupplungsring in seiner Verschieberichtung unter der Kraft einer sich gegen den Teleskopring oder die Stellhülse abstützenden Feder steht, und daß der Futterkörper mindestens einen Anschlagkopf aufweist, für den in der Wand des Kupplungsrings eine aus zwei nebeneinanderlaufenden, unterschiedlich langen axialen Nuten bestehende Aussparung vorgesehen ist, wobei die Nuten auf der dem Stellring zugewandten Seite für den Eintritt des Anschlagkopfes offen sind und wozu der Kupplungsring auf dem Futterkörper so verdrehbar ist, daß entweder die eine oder die andere der beiden Nuten mit dem Anschlagkopf axial fluchtet.Another advantageous development of the invention is characterized in that the coupling ring in its displacement direction is under the force of a spring which is supported against the telescopic ring or the adjusting sleeve, and in that the chuck body has at least one stop head for which one of two is in the wall of the coupling ring juxtaposed, different length axial grooves existing recess is provided, the grooves on the side facing the collar are open for the entry of the stop head and for which the coupling ring on the chuck body is rotatable so that either one or the other of the two grooves with the Stop head aligned axially.

Im folgenden wird die Erfindung an einem in der Zeichnung dargestellten Ausführungsbeispiel näher erläutert ; es zeigen :

  • Fig. 1 eine Schlagbohreinrichtung nach der Erfindung in einem Axialschnitt, teils in einer Seitenansicht,
  • Fig. 2 einen Querschnitt durch die Schlagbohreinrichtung nach Fig. 1 in Richtung A-A,
  • Fig. 3 einen Schnitt in Richtung B-B in Fig. 1, und zwar in der Betriebsstellung der Schlagbohreinrichtung mit eingeschaltetem Verschiebungsspiel des Bohrfutters auf der Bohrspindel.
In the following the invention on a in the drawing illustrated embodiment explained in more detail; show it :
  • 1 is a hammer drilling device according to the invention in an axial section, partly in a side view,
  • 2 shows a cross section through the percussion drilling device according to FIG. 1 in the direction AA,
  • Fig. 3 shows a section in the direction BB in Fig. 1, in the operating position of the percussion drilling device with activated displacement play of the drill chuck on the drill spindle.

Die in der Zeichnung dargestellte Schlagbohreinrichtung besteht aus einer nur teilweise dargestellten Bohrspindel 1, die drehschlüssig ein Bohrfutter 2 antreibt. Dieses Bohrfutter 2 besitzt einen axialen Durchgang 3, durch den hindurch die Schlagwirkung eines in der hohlen Bohrspindel axial geführten und ebenfalls nur teilweise dargestellten Döppers 4 auf das Ende eines im Bohrfutter 2 zwischen von einem Stellring 20 zentrisch verstellbaren Futterbacken 5 gehaltenen, in der Zeichnung jedoch nicht dargestellten Bohrers übertragbar ist. Zur drehschlüssigen Verbindung des Bohrfutters 2 mit der Bohrspindel 1 sind Kupplungsglieder 6 vorgesehen, die in Drehrichtung formschlüssig in am Futterkörper 7 und an der Bohrspindel 1 vorgesehene Kupplungsaufnahmen 8, 9 greifen. Diese ermöglichen dem Bohrfutter 2 auf der Bohrspindel 1 ein axiales Verschiebungsspiel, das durch eine Verriegelungsvorrichtung mittels eines Kupplungsrings 12 ausgeschaltet werden kann. Dazu weist die Verriegelungsvorrichtung ein radial verstellbares, im Futterkörper 7 geführtes Sperrglied 29 auf. Das Sperrglied 29 steht in eine sich in der Bohrspindel 1 axial erstreckende Nut 30 vor, in der eine Vertiefung 32 angeordnet ist. Das Sperrglied 29 ist durch eine den Futterkörper 7 umschließend und um diesen drehbare Stellhülse 31 zur Sperrung des axialen Verschiebungsspiels in die Vertiefung 32 vorstellbar. Dabei weist die Stellhülse 31 eine den Austritt des Sperrglieds 29 aus der Vertiefung 32 ermöglichende, radial auswärts gerichtete Aussparung 33 auf. Die Stellhülse 31 wird in Drehrichtung von dem axial verschiebbaren und gegen Drehung feststellbaren Kupplungsring 12 mitgenommen.The percussion drilling device shown in the drawing consists of a drilling spindle 1, only partially shown, which rotatably drives a drill chuck 2. This drill chuck 2 has an axial passage 3, through which the impact of a striker 4 axially guided in the hollow drilling spindle and also only partially shown on the end of a chuck jaw 5 held in the chuck 2 between the jaws 5, which can be adjusted centrally by an adjusting ring 20, but in the drawing not shown drill is transferable. For rotationally locking connection of the drill chuck 2 with the drilling spindle 1, coupling members 6 are provided which engage in a form-fitting manner in the rotational direction in coupling receptacles 8, 9 provided on the chuck body 7 and on the drilling spindle 1. These enable the chuck 2 on the drill spindle 1 to have an axial play which can be switched off by a locking device by means of a coupling ring 12. For this purpose, the locking device has a radially adjustable locking member 29 guided in the chuck body 7. The locking member 29 projects into a groove 30 which extends axially in the drilling spindle 1 and in which a recess 32 is arranged. The locking member 29 is conceivable by enclosing the chuck body 7 and about this rotatable adjusting sleeve 31 to lock the axial play in the recess 32. In this case, the adjusting sleeve 31 has a recess 33, which allows the locking member 29 to emerge from the recess 32 and is directed radially outwards. The adjusting sleeve 31 is carried in the direction of rotation by the axially displaceable and lockable coupling ring 12.

Im einzelnen ist die Nut 30 von einer jeweils endseitig geschlossenen Längsnut gebildet, deren Länge dem axialen Verschiebungsspiel angepaßt ist. Die Vertiefung 32 ist dabei an dem den Futterbacken 5 abgewandten Ende der Längsnut taschenartig ausgebildet. Dadurch ist über das Sperrglied 29 auch eine drehschlüssige Verbindung zwischen dem Bohrfutter 2 und der Bohrspindel 1 gegeben, so daß das Kupplungsglied 6 an sich auch entfallen kann. Die Stellhülse 31 ist fest mit einem sie umschließenden, gegenüber dem Futterkörper 7 durch einen Ring 34 axial unverschiebbaren Teleskopring 35 verbunden. Der Teleskopring steht bei 36 mit dem Kupplungsring 12 in drehfestem Eingriff, wodurch der Kupplungsring 12 axial frei verstellbar bleibt, bei seiner Verdrehung jedoch den Teleskopring 35 mitnimmt.In particular, the groove 30 is formed by a longitudinal groove which is closed at each end, the length of which is adapted to the axial displacement play. The recess 32 is pocket-like at the end of the longitudinal groove facing away from the chuck jaws 5. As a result, a rotational connection between the chuck 2 and the drilling spindle 1 is also provided via the locking member 29, so that the coupling member 6 itself can also be omitted. The adjusting sleeve 31 is firmly connected to a telescopic ring 35 which surrounds it and is axially immovable relative to the chuck body 7 by means of a ring 34. At 36, the telescopic ring is in rotationally fixed engagement with the coupling ring 12, as a result of which the coupling ring 12 remains axially freely adjustable, but takes the telescopic ring 35 with it when it is rotated.

In der in den Fig. 1 und 2 dargestellten Stellung des Kupplungsrings 12 befindet sich das als Kugel ausgebildete Sperrglied 29 in der Aussparung 33 der Stellhülse 31, ist also aus der Vertiefung 32 in der Nut 30 ausgetreten. Dadurch kann der Futterkörper 7 ein axiales Verschiebungsspiel gegenüber der Bohrspindel 1 ausführen, wobei das Sperrglied 29 sich in Längsrichtung der Nut 30 bewegt. Wird dagegen der Kupplungsring 12 in seiner Drehrichtung verstellt, so wird das Sperrglied 29 über den Teleskopring 35 und die Stellhülse 31 durch die an die Aussparung 33 angrenzende Schräge 37 radial einwärts in die Vertiefung 32 verstellt, wodurch das axiale Verschiebungsspiel des Futterkörpers 7 ausgeschaltet ist.In the position of the coupling ring 12 shown in FIGS. 1 and 2, the locking member 29, which is designed as a ball, is located in the recess 33 of the adjusting sleeve 31, ie it has emerged from the recess 32 in the groove 30. As a result, the chuck body 7 can carry out an axial displacement play with respect to the drilling spindle 1, the locking member 29 moving in the longitudinal direction of the groove 30. If, on the other hand, the coupling ring 12 is adjusted in its direction of rotation, the locking member 29 is adjusted radially inward into the recess 32 via the telescopic ring 35 and the adjusting sleeve 31 through the bevel 37 adjoining the recess 33, as a result of which the axial displacement play of the chuck body 7 is switched off.

Um im Schlagbohrbetrieb, wenn also das axiale Verschiebungsspiel eingeschaltet ist, zu verhindern, daß sich das Bohrfutter 2 unter den Beanspruchungen des Schlagbohrbetriebs selbsttätig löst oder weiter so spannt, daß ein an sich gewolltes axiales Verschiebungsspiel des Bohrwerkzeugs in der von den Futterbacken 5 gebildeten Aufnahme verloren geht, ist in beiden Ausführungsformen der Kupplungsring 12 an seinem dem Stellring 20 zugewandten Rand mit Zähnen 21 versehen, die bei axial bohrerseitiger Stellung des Kupplungsrings 12 in eine zugeordnete Gegenverzahnung 22 des Stellrings 20 eingreifen. Dazu steht der Kupplungsring 12 in seiner Verschieberichtung unter der Kraft einer Feder 23, die sich in der Ausführungsform nach den Fig. 1 bis 4 gegen den Futterkörper 7 in einem Ringfalz, in der Ausbildung nach den Fig. 5 bis 7 dagegen an der Stellhülse 31 abstützt, wodurch der Kupplungsring 12 in seine axial bohrerseitige, die Verstellung des Stellrings sperrende Stellung gedrückt wird. Ferner weist der Futterkörper 7 mindestens einen Anschlagkopf 24 auf, für den in der Wand des Kupplungsrings 12 eine aus zwei nebeneinander laufenden, unterschiedlich langen axialen Nuten 25.1, 25.2 bestehende Aussparung vorgesehen ist. Die Nuten 25.1, 25.1 sind auf der dem Stellring 20 zugewandten Seiten für den Eintritt des Anschlagkopfes 24 offen. Der Kupplungsring 12 ist auf dem Futterkörper 7 so verdrehbar, daß entweder die eine oder die andere der beiden Nuten 25.1, 25.2 mit dem Anschlagkopf 24 axial fluchtet. Der Anschlagkopf 24 selbst ist in Längsrichtung der Nuten 25.1, 25.2 stegartig verlängert und bildet mit seinen Steglängsseiten Anschlagflächen für die Nutseitenwände. Im einzelnen bildet der Anschlagkopf das Ende eines Stiftes, der radial in eine Bohrung des Futterkörpers 7 eingesteckt ist und den Anschlagkopf 24 am Futterkörper 7 verankert.In order to prevent the drill chuck 2 from loosening automatically under the stresses of the impact drilling operation, or to continue tensioning in the percussion drilling operation, that is to say when the axial displacement play is switched on, such that a desired axial displacement play of the drilling tool is lost in the receptacle formed by the chuck jaws 5 is, in both embodiments, the coupling ring 12 is provided on its edge facing the adjusting ring 20 with teeth 21 which engage in an associated counter-toothing 22 of the adjusting ring 20 when the coupling ring 12 is in the axial position on the drill. For this purpose, the coupling ring 12 is in its direction of displacement under the force of a spring 23 which, in the embodiment according to FIGS. 1 to 4, rests against the chuck body 7 in an annular fold, in the embodiment according to FIGS. 5 to 7 on the adjusting sleeve 31 supports, whereby the coupling ring 12 is pressed into its axial drill-side position blocking the adjustment of the adjusting ring. Furthermore, the chuck body 7 has at least one stop head 24, for which a recess is provided in the wall of the coupling ring 12, which consists of two axial grooves 25.1, 25.2 of different lengths running next to one another. The grooves 25.1, 25.1 are open on the side facing the adjusting ring 20 for the entry of the stop head 24. The coupling ring 12 can be rotated on the chuck body 7 so that either one or the other of the two grooves 25.1, 25.2 is axially aligned with the stop head 24. The stop head 24 itself is elongated in the longitudinal direction of the grooves 25.1, 25.2 in a web-like manner and forms stop surfaces for the groove side walls with its web longitudinal sides. In particular, the stop head forms the end of a pin which is inserted radially into a bore in the chuck body 7 and anchors the stop head 24 on the chuck body 7.

Im übrigen zeigt das Bohrfutter 2 weitgehend üblichen Aufbau. Im Futterkörper 7 sind die zentrisch verstellbaren Spannbacken 5 geführt, zu deren Verstellung der am Futterkörper 7 drehbare, aber axial unverschiebbare Stellring 20 dient, der mit seinem Innengewinde in eine Verzahnung der Spannbacken 5 greift. Der Stellring 20 selbst besitzt einen Zahnkranz 26 zum Eingriff in das Zahnritzel 27 eines am Bohrfutter 2 zum Spannen oder Lösen ansetzbaren Spannschlüssels 28.For the rest, the drill chuck 2 shows a largely customary structure. The centrally adjustable clamping jaws 5 are guided in the chuck body 7, the adjusting ring 20, which is rotatable but axially immovable on the chuck body 7 and serves with its internal thread, engages in a toothing of the clamping jaws 5. The adjusting ring 20 itself has a ring gear 26 for engaging the toothed pinion 27 of a clamping key 28 which can be attached to the chuck 2 for clamping or releasing.

Claims (4)

1. A hammer drilling apparatus comprising a drilling chuck (2) which can be driven by a drilling spindle (1), in particular a drilling chuck (2) which has an axial through passage (3) through which the hammer action of an anvil (4) which is axially guided in the hollow drilling spindle (1) can be transmitted to the end of the drill which is held in the drilling chuck (2) between chuck jaws (5) which are concentrically adjustable by an adjusting ring (20), characterised in that for non-rotatably connecting the drilling chuck (2) to the drilling spindle (1) there is provided at least one coupling member (6) which engages positively in coupling receiving means (8, 9) in the drilling spindle (1) on the one hand and the chuck body (7) on the other hand and permits the drilling chuck (2) to perform on the drilling spindle (1) an axial free motion which can be eliminated by a locking device with a coupling ring, wherein the locking device has a radially displaceable locking member (29) which is guided in the chuck body (7) and which projects into a groove (30) extending axially in the drilling spindle (1) and can be introduced into a depression (32) in the groove (30) by an adjusting sleeve (31) which is disposed around the chuck body (7) and which is rotatable therearound, for blocking the axial free motion, wherein the adjusting sleeve (31) has a radially outwardly directed recess (33) which permits the locking member (29) to come out of the depression (32), and is entrained in the direction of rotation by the coupling ring (12) which is axially displaceable and which can be prevented from rotating, and that at its edge towards the adjusting ring (20) the coupling ring (12) is provided with teeth (21) which, when the coupling ring (12) is in the position of being axially towards the drill, engage into an associated co-operating tooth arrangement (22) on the adjusting ring (20).
2. A hammer drilling apparatus according to claim 1 characterised in that the groove (30) is formed by a longitudinal groove which is closed at each of its ends, of a length which is adapted to the axial free motion, wherein the depression (32) is of a pocket-like configuration at the end of the longitudinal groove which is remote from the chuck jaws (5).
3. A hammer drilling apparatus according to claim 1 or claim 2 characterised in that the adjusting sleeve (31) is fixedly connected to a telescopic ring (35) which is disposed around the adjusting sleeve (31) and which is axially immovable relative to the chuck body (7) and which is in non-rotational engagement with the coupling ring (12).
4. A hammer drilling apparatus according to claims 1 to 3 characterised in that the coupling ring (12) is subjected, in its direction of displacement, to the force of a spring (23) which is supported against the telescopic ring or the adjusting sleeve, and that the chuck body (7) has at least one abutment head (24) for which a recess is provided in the wall of the coupling ring (12), the recess comprising two axial grooves (25.1, 25.2) which extend in side-by-side relationship and which are of different lengths, wherein the grooves (25.1, 25.2) are open on the side which is towards the adjusting ring (20) for the abutment head (24) to pass thereinto and for which purpose the coupling ring (12) is rotatable on the chuck body (7) in such a way that either one or the other of the two grooves (25.1, 25.2) is axially aligned with the abutment head (24).
EP86100971A 1985-03-14 1986-01-24 Chuck for percussive-rotary or rotary drilling Expired EP0195193B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3509165 1985-03-14
DE3509165A DE3509165C1 (en) 1985-03-14 1985-03-14 Drill chuck

Publications (2)

Publication Number Publication Date
EP0195193A1 EP0195193A1 (en) 1986-09-24
EP0195193B1 true EP0195193B1 (en) 1988-03-23

Family

ID=6265206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86100971A Expired EP0195193B1 (en) 1985-03-14 1986-01-24 Chuck for percussive-rotary or rotary drilling

Country Status (5)

Country Link
US (1) US4703941A (en)
EP (1) EP0195193B1 (en)
JP (1) JPH0620648B2 (en)
DE (1) DE3509165C1 (en)
ES (1) ES292512Y (en)

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US5908076A (en) * 1997-01-10 1999-06-01 Power Tool Holders Incorporated Impact tool driver
US5992538A (en) * 1997-08-08 1999-11-30 Power Tool Holders Incorporated Impact tool driver
US6073939A (en) * 1998-06-05 2000-06-13 Power Tool Holders Incorporated Locking chuck
US6196554B1 (en) 1998-12-15 2001-03-06 Power Tool Holders Incorporated Locking chuck
US7455303B2 (en) * 2005-09-02 2008-11-25 The Jacobs Chuck Manufacturing Company Chuck with internal nut
CA2555533A1 (en) * 2006-08-08 2008-02-08 Fern Beauchamp Hammer drill bit chuck attachment
US8075229B2 (en) 2007-06-26 2011-12-13 Techtronic Power Tools Technology Limited Multi-speed drill and chuck assembly
US8057134B2 (en) 2007-06-26 2011-11-15 Techtronic Power Tools Technology Limited Chuck assembly
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US8777232B2 (en) 2009-07-29 2014-07-15 Jacobs Chuck Manufacturing Company Self-tightening chuck with a radial lock
US10556276B2 (en) 2013-03-14 2020-02-11 Apex Brands, Inc. Locking chuck

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Also Published As

Publication number Publication date
ES292512Y (en) 1987-02-16
JPS61219505A (en) 1986-09-29
JPH0620648B2 (en) 1994-03-23
DE3509165C1 (en) 1986-07-31
US4703941A (en) 1987-11-03
ES292512U (en) 1986-06-01
EP0195193A1 (en) 1986-09-24

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