EP0474591A2 - Subcalibre shaft with central drillholder - Google Patents

Subcalibre shaft with central drillholder Download PDF

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Publication number
EP0474591A2
EP0474591A2 EP91810638A EP91810638A EP0474591A2 EP 0474591 A2 EP0474591 A2 EP 0474591A2 EP 91810638 A EP91810638 A EP 91810638A EP 91810638 A EP91810638 A EP 91810638A EP 0474591 A2 EP0474591 A2 EP 0474591A2
Authority
EP
European Patent Office
Prior art keywords
opening
tool
locking element
central opening
tool according
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
EP91810638A
Other languages
German (de)
French (fr)
Other versions
EP0474591A3 (en
EP0474591B1 (en
Inventor
Werner Bogner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
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Filing date
Publication date
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Publication of EP0474591A2 publication Critical patent/EP0474591A2/en
Publication of EP0474591A3 publication Critical patent/EP0474591A3/en
Application granted granted Critical
Publication of EP0474591B1 publication Critical patent/EP0474591B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
    • 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
    • B25D17/084—Rotating chucks or sockets
    • B25D17/088—Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0038—Locking members of special shape
    • B25D2217/0042—Ball-shaped locking members
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S279/00—Chucks or sockets
    • Y10S279/904—Quick change socket
    • Y10S279/905—Quick change socket with ball detent
    • 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
    • Y10T279/17128—Self-grasping
    • Y10T279/17136—Yielding grasping jaws
    • Y10T279/17145—Ball or roller
    • 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
    • Y10T279/17761—Side detent
    • Y10T279/17786—Spring
    • 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
    • Y10T408/89—Tool or Tool with support
    • Y10T408/895—Having axial, core-receiving central portion
    • Y10T408/8957—Having axial, core-receiving central portion and having stepped cutting edges
    • 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 tool with an insertion shaft for tool holders of drilling and chiseling devices, an annular groove for engaging tangentially extending, cylindrical locking elements of the tool holder being provided on the insertion shaft.
  • the tool is automatically centered without play when supported by the conical receiving opening when inserted from the wall of the receiving opening.
  • the tools are rotated by means of driver strips on the tool holder, which engage in grooves on the tool side.
  • the tools are axially held by essentially radially displaceable pins which are arranged tangentially to the receiving opening and which engage in corresponding recesses, in particular in an annular groove of the tool.
  • Appropriate openings must be made in the walls, mainly for electrical or sanitary installations in buildings. This can be done through holes e.g. for pipes or corresponding recesses in walls in which e.g. Flush-mounted boxes for switches or sockets can be attached.
  • Such works are essentially openings that have a larger diameter.
  • larger drilling rigs are used for such work.
  • These devices are attached to the component using a base plate, vacuum or anchor fixings. The actual device is fastened to the base plate with the drill bit.
  • the difficulty with the use of a hand-held drill is the running of the drill bit when it is placed on a component. Precise positioning with such a drill bit cannot be achieved.
  • the prior art known from DE-A-30 29 101 relates to a hollow core bit with a center drill, the core bit having diamond grinding segments on the end face.
  • the center drill is clamped in a rear extension of the carrier body within a hole by means of a clamping screw.
  • the spiral part of the center drill extends at least over the entire length of the drill body of the hollow drill bit.
  • the center drill always remains clamped in the tool during the entire drilling process.
  • the disadvantage is that abrupt torques of different sizes can act on the center drill.
  • a screw pressing radially on the smooth, cylindrical shaft of the center drill With a screw pressing radially on the smooth, cylindrical shaft of the center drill, a secure, non-slip clamping of the center drill in the carrier body cannot be guaranteed. If the drill slides, no further immersion can take place in the component to be machined.
  • the invention has for its object to provide a way to quickly and easily attach and remove a drill used for centering the tool in the shank area of the tool in order to achieve a precise placement of a hand-held drill bit.
  • the object is achieved in that the insertion shaft has a central opening that is open in the direction of drilling and has an opening that is open from the annular groove to the central opening, wherein an essentially radially displaceable locking element is mounted in the opening, the radial extension of which exceeds the wall thickness in the opening area .
  • the opening of the opening towards the central opening advantageously has a smaller cross section than the radial projection of the locking element.
  • the opening can be largely cylindrical over its entire length, having a conical narrowing.
  • the narrowing of the opening has the task of preventing the locking element from falling out of the opening into the central opening.
  • the locking element can have different shapes.
  • the cross section of the locking element can be polygonal or rounded.
  • a locking element in the form of a ball is preferably used.
  • a spring element is expediently provided, which serves to prevent the locking element from falling out in the opposite direction to the central opening.
  • This element can e.g. consist of metal, plastic or rubber and can be designed as a compression or leaf spring.
  • a spring element is used, which is designed as an elastic ring.
  • This elastic ring can be made of metal, plastic or rubber.
  • the cross section can have different shapes, e.g. round or polygonal.
  • One or more driver strips for rotary driving are advantageously arranged in the central recess.
  • the planks of the driver strips are designed radially and protrude into the central recess.
  • a further advantageous embodiment of the invention is that the locking elements are held in the position protruding into the central opening by the locking elements which are inserted into the annular groove.
  • the tool can be designed, for example, in two parts, a hollow cylinder being connected to the insert shaft by means of a releasable connection, in particular a thread.
  • This has the advantage that the insertion shaft can be used as an adapter on which hollow cylinders can be fastened with drill bits of different diameters.
  • the hollow cylinder can have the external thread and the drill bit the matching thread.
  • Another embodiment is the arrangement of the external thread on the hollow cylinder and an adapter with the appropriate internal thread. It is now possible to drill a center hole on the component without the hollow cylinder with drill bit being arranged on the adapter. Depending on the application, the tool can be put together appropriately.
  • FIG. 1 shows a tool 1 with a drill bit 15 having diamond grains.
  • An insertion shaft 2 is connected at the end to a hollow cylinder (14) provided with thread 10.
  • the insertion shank 2 essentially has a conical contour corresponding to the receiving opening of a suitable tool holder known per se and therefore not shown, with a control angle A, which is preferably designed at 25 °.
  • a cylindrical, free end section 12 of the insertion shaft 2 corresponds in diameter E to a bore section, also not shown, in the receiving sleeve of a tool holder.
  • an annular groove 3 is provided in the region of the tapered contour of the insertion shaft 2, the base of which is formed by a flank B on the insertion side and a flank C opposite this.
  • the flank B is inclined at an angle D of 30 ° to the tool axis, while the opposite flank C is essentially perpendicular to the tool axis.
  • the insertion shaft 2 has a central opening 4 which is open in the drilling direction and has an opening 5 which is open from the annular groove 3 to the central opening 4.
  • an essentially radially displaceable locking element 6 is mounted, the radial extent of which exceeds the wall thickness F in the opening area.
  • two driver strips 9 are arranged in the central opening 4. It is thus possible to fasten a center drill 13 with a corresponding shaft centrally within a drill bit.
  • the grooves located on the shaft which are open to the rear, align with the driver strips 9, whereupon the latter can be inserted.
  • the locking element 6 arranged in the area of the annular groove 3 comes through the opening 5 running towards the central opening 4 into engagement with the recess 16, which is further arranged on the shaft of the center drill 13 and is closed on both sides.
  • This recess 16 serves only for the axial locking the center drill 13 in the shank 2.
  • the opening 5 has a cross-sectional constriction at the mouth 7 towards the central opening 4, which prevents the locking element 6 from falling out.
  • a spring element 8 is provided which is designed as an elastic ring. This can be made of metal, plastic or rubber.
  • the cross section can have different shapes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)
  • Earth Drilling (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Gripping On Spindles (AREA)
  • Surgical Instruments (AREA)
  • Drilling And Boring (AREA)
  • Soil Working Implements (AREA)

Abstract

The insertion shaft (2) of the tool (1) has a central opening (4) open in the drilling direction, which serves for holding a centre bit (13), a substantially radially displaceable locking element (6) being mounted through an open perforation (5) and driving strips (9) being present, said driving strips serving for driving the centre bit (13) in rotation. <IMAGE>

Description

Die Erfindung betrifft ein Werkzeug mit Einsteckschaft für Werkzeughalter von Bohr- und Meisselgeräten, wobei am Einsteckschaft eine Ringnut zum Eingriff tangential verlaufender, zylindrischer Arretierungselemente des Werkzeughalters vorgesehen ist.The invention relates to a tool with an insertion shaft for tool holders of drilling and chiseling devices, an annular groove for engaging tangentially extending, cylindrical locking elements of the tool holder being provided on the insertion shaft.

Bei der aus der DE-A-34 34 076 bekannten Vorrichtung wird das Werkzeug durch die kegelige Aufnahmeöffnung beim Einschieben von der Wandung der Aufnahmeöffnung unter Abstützung automatisch spielfrei zentriert. Die Drehmitnahme der Werkzeuge erfolgt über Mitnehmerleisten am Werkzeughalter, die in werkzeugseitigen Nuten eingreifen. Die axiale Halterung der Werkzeuge erfolgt durch tangential zur Aufnahmeöffnung angeordnete, im wesentlichen radial verschiebbare Stifte, die in entsprechende Ausnehmungen, insbesondere in eine Ringnut des Werkzeuges einrücken.In the device known from DE-A-34 34 076, the tool is automatically centered without play when supported by the conical receiving opening when inserted from the wall of the receiving opening. The tools are rotated by means of driver strips on the tool holder, which engage in grooves on the tool side. The tools are axially held by essentially radially displaceable pins which are arranged tangentially to the receiving opening and which engage in corresponding recesses, in particular in an annular groove of the tool.

Hauptsächlich bei Elektro- bzw. Sanitärinstallationen in Bauwerken müssen entsprechende Öffnungen in den Wänden angebracht werden. Dies können durchgehende Bohrungen z.B. für Rohre oder entsprechende Vertiefungen in Wänden sein, in denen z.B. Unterputzdosen für Schalter oder Steckdosen angebracht werden.Appropriate openings must be made in the walls, mainly for electrical or sanitary installations in buildings. This can be done through holes e.g. for pipes or corresponding recesses in walls in which e.g. Flush-mounted boxes for switches or sockets can be attached.

Bei solchen Arbeiten handelt es sich im wesentlichen um Öffnungen, die einen grösseren Durchmesser aufweisen. Um Bohrkronen dieser Grösse fachgerecht einsetzen zu können, werden für solche Arbeiten grössere Bohrgeräte verwendet. Diese Geräte werden mittels einer Grundplatte, durch Vakuum oder Ankerbefestigungen am Bauteil angebracht. Das eigentliche Gerät ist dabei mit der Bohrkrone auf dieser Grundplatte befestigt.Such works are essentially openings that have a larger diameter. In order to be able to use drill bits of this size properly, larger drilling rigs are used for such work. These devices are attached to the component using a base plate, vacuum or anchor fixings. The actual device is fastened to the base plate with the drill bit.

Es gibt Anwendungsfälle, die in einem kleineren Durchmesserbereich liegen, die von der Grösse her ohne weiteres mit einem handgeführten Bohrgerät erstellt werden können.There are applications that are in a smaller diameter range, which can be easily created with a hand-held drill.

Die Schwierigkeit beim Einsatz eines handgeführten Bohrgerätes besteht im Verlaufen der Bohrkrone, wenn diese auf ein Bauteil aufgesetzt wird. Es kann somit kein punktgenaues Ansetzen mit einer solchen Bohrkrone erreicht werden.The difficulty with the use of a hand-held drill is the running of the drill bit when it is placed on a component. Precise positioning with such a drill bit cannot be achieved.

Der aus der DE-A-30 29 101 bekannte Stand der Technik betrifft eine Hohlbohrkrone mit Zentrumbohrer, wobei die Bohrkrone am Umfang stirnseitig Diamantschleifsegmente aufweist. Der Zentrumbohrer wird in einem hinteren Ansatz des Trägerkörpers innerhalb einer Bohrung mittels einer Klemmschraube festgeklemmt.The prior art known from DE-A-30 29 101 relates to a hollow core bit with a center drill, the core bit having diamond grinding segments on the end face. The center drill is clamped in a rear extension of the carrier body within a hole by means of a clamping screw.

Der spiralförmige Teil des Zentumbohrers erstreckt sich wenigstens über die gesamte länge des Bohrkörpers der Hohlbohrkrone. Der Zentrumsbohrer bleibt während des gesamten Bohrvorganges immer im Werkzeug eingespannt.The spiral part of the center drill extends at least over the entire length of the drill body of the hollow drill bit. The center drill always remains clamped in the tool during the entire drilling process.

Abhängig vom Material des zu bearbeitenden Bauteils besteht der Nachteil darin, dass unterschiedlich hohe, schlagartige Drehmomente auf den Zentrumsbohrer wirken können. Mit einer radial auf den glatten, zylindrischen Schaft des Zentrumbohrers drückenden Schraube kann eine sichere, rutschfreie Klemmung des Zentumbohrers im Trägerkörper nicht gewährleistet werden. Beim Rutschen des Bohrers kann kein weiteres Eintauchen in das zu bearbeitende Bauteil stattfinden.Depending on the material of the component to be machined, the disadvantage is that abrupt torques of different sizes can act on the center drill. With a screw pressing radially on the smooth, cylindrical shaft of the center drill, a secure, non-slip clamping of the center drill in the carrier body cannot be guaranteed. If the drill slides, no further immersion can take place in the component to be machined.

Bei der Montage des Schaftes eines Zentrumsbohrers im Trägeköper muss darauf geachtet werden, dass ein bestimmter bestand zwischen der Stirnseite der Diamantsegmente und der Spitze des Zentrumsbohrers eingehalten wird. Der ständige Einsatz des Zentrumbohrers während des Bohrvorganges macht ein öfteres Nachschleifen erforderlich, was zu einer ständigen Verkürzung des Bohrers führt. Das Schaftende des Zentrumbohrers kann sich daher nie am Grund der Aufnahmebohrung des Trägerkörpers abstützen. Somit besteht die Gefahr der axialen Verschiebung des Zentrumbohrers beim Ansetzen auf das Bauteil bzw während des Bohrvorganges entgegen der Bohrrichtung. Dabei kann die Spitze des Zentrumbohrers hinter die Schneidfläche der Bohrkrone in den Hohlkörper eintauchen, was spätestens bei der darauffolgenden Bohrung ein Zentrieren unmöglïch macht.When assembling the shank of a center drill in the supporting body, care must be taken to ensure that a certain amount is maintained between the front of the diamond segments and the tip of the center drill. The constant use of the center drill during the drilling process requires frequent regrinding, which leads to a constant shortening of the drill. The shaft end of the center drill can therefore never be supported on the base of the receiving bore of the carrier body. There is therefore a risk of axial Displacement of the center drill when attaching to the component or during the drilling process against the drilling direction. The tip of the center drill can dip into the hollow body behind the cutting surface of the drill bit, which makes centering impossible at the latest when the hole is subsequently drilled.

Der Erfindung liegt die Aufgabe zugrunde, eine Möglichkeit zu schaffen, ein dem Zentrieren des Werkzeuges dienender Bohrer schnell und einfach im Schaftbereich des Werkzeuges befestigen und entfemen zu können, um ein punktgenaues Aufsetzen einer handgeführten Bohrkrone zu erreichen.The invention has for its object to provide a way to quickly and easily attach and remove a drill used for centering the tool in the shank area of the tool in order to achieve a precise placement of a hand-held drill bit.

Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass der Einsteckschaft eine in Bohrrichtung offene, zentrale Oeffnung mit einer von der Ringnut zur zentralen Oeffnung hin offenen Durchbrechung aufweist, wobei in der Durchbrechung ein im wesentlichen radial verschiebbares Verriegelungselement gelagert ist, dessen Radialerstreckung die Wandstärke im Durchbrechungsbereich übersteigt.According to the invention, the object is achieved in that the insertion shaft has a central opening that is open in the direction of drilling and has an opening that is open from the annular groove to the central opening, wherein an essentially radially displaceable locking element is mounted in the opening, the radial extension of which exceeds the wall thickness in the opening area .

Es ist dank der erfindungsgemässen Lösung somit möglich, einen Zentrierbohrer mit einem entsprechenden Schaft zentral innerhalb einer Hohlbohrkrone in dem Einsteckschaft zu befestigen.Thanks to the solution according to the invention, it is thus possible to fasten a center drill with a corresponding shaft centrally within a hollow drill bit in the insert shaft.

Vorteilhafterweise weist die Mündung der Durchbrechung zur zentralen Öffnung hin einen kleineren querschnitt auf, als die Radialprojektion des Verriegelungselementes. Die Durchbrechung kann dabei auf ihrer ganzen Länge grösstenteils zylindrisch, eine konische Verengung aufweisend, ausgebildet sein. Die Verengung der Durchbrechung hat die Aufgabe, das Verriegelungselement gegen Herausfallen aus der Durchbrechung in die zentrale Öffnung hin zu verhindern. Das Verriegelungselement kann verschiedene Formen aufweisen. Der querschnitt des Verriegelungselementes kann mehreckig oder gerundet sein. Vorzugsweise wird ein Verriegelungselement in Form einer Kugel verwendet.The opening of the opening towards the central opening advantageously has a smaller cross section than the radial projection of the locking element. The opening can be largely cylindrical over its entire length, having a conical narrowing. The narrowing of the opening has the task of preventing the locking element from falling out of the opening into the central opening. The locking element can have different shapes. The cross section of the locking element can be polygonal or rounded. A locking element in the form of a ball is preferably used.

Im Bereich der Ringnut ist zweckmässigerweise ein Federelement vorgesehen, das als Herausfallsicherung für das Verriegelungselement in entgegengesetzter Richtung zur zentralen Oeffnung dient. Dieses Element kann z.B. aus Metall, Kunststoff oder Gummi bestehen und kann als Druck- oder Blattfeder ausgebildet sein.In the area of the annular groove, a spring element is expediently provided, which serves to prevent the locking element from falling out in the opposite direction to the central opening. This element can e.g. consist of metal, plastic or rubber and can be designed as a compression or leaf spring.

Vorzugsweise wird ein Federelement verwendet, das als elastischer Ring ausgebildet ist. Dieser elastische Ring kann aus Metall, Kunststoff oder Gummi bestehen. Der Querschnitt kann unterschiedliche Formen, wie z.B. rund oder mehreckig, aufweisen.Preferably, a spring element is used, which is designed as an elastic ring. This elastic ring can be made of metal, plastic or rubber. The cross section can have different shapes, e.g. round or polygonal.

Vorteilhafter Weise sind in der zentralen Ausnehmung eine oder mehrere Mitnehmerleisten zur Drehmitnahme angeordnet. Die Planken der Mitnehmerleisten sind radial ausgebildet und ragen in die zentrale Ausnehmung.One or more driver strips for rotary driving are advantageously arranged in the central recess. The planks of the driver strips are designed radially and protrude into the central recess.

Eine weitere vorteilhafte Ausgestaltung der Erfindung liegt darin, dass die Verriegelungselemente von den in die Ringnut eingerückten Arretierungselementen in der in die zentrale Oeffnung ragenden Stellung gehalten werden.A further advantageous embodiment of the invention is that the locking elements are held in the position protruding into the central opening by the locking elements which are inserted into the annular groove.

Das Werkzeug kann beispielsweise zweiteilig ausgebildet sein, wobei ein Hohlzylinder mit dem Einsteckschaft mittels einer lösbaren Verbindung, insbesondere eines Gewindes, verbunden ist. Dies hat den Vorteil, dass der Einsteckschaft als Adapter verwendet werden kann, auf dem Hohlzylinder mit Bohrkronen von unterschiedlichen Durchmessern befestigt werden können. Dabei kann der Hohlzylinder das Aussengewinde und die Bohrkrone das dazupassende Imengewinde aufweisen. Eine weitere Ausführungsform ist die Anordnung des Aussengewindes am Hohlzylinder und ein Adapter mit dem passenden Innengewinde. Es besteht welters die Möglichkeit, eine Zentrierbohrung am Bauteil anzubringen, ohne dass der Hohlzylinder mit Bohrkrone am Adapter angeordnet ist. Je nach Anwendungsfall kann das Werkzeug passend zusammengestellt werden.The tool can be designed, for example, in two parts, a hollow cylinder being connected to the insert shaft by means of a releasable connection, in particular a thread. This has the advantage that the insertion shaft can be used as an adapter on which hollow cylinders can be fastened with drill bits of different diameters. The hollow cylinder can have the external thread and the drill bit the matching thread. Another embodiment is the arrangement of the external thread on the hollow cylinder and an adapter with the appropriate internal thread. It is now possible to drill a center hole on the component without the hollow cylinder with drill bit being arranged on the adapter. Depending on the application, the tool can be put together appropriately.

So sind die Kombinationen Einsteckschaft mit Bohrkrone, Einsteckschaft mit Zentrumbohrer sowie Einsteckschaft mit Bohrkrone und Zentrumbohrer möglich.The combinations of insertion shank with drill bit, insertion shank with center drill and insertion shank with drill bit and center drill are possible.

Die Erfindung wird nachstehend anhand einer Zeichnung, die ein Ausführungsbeispiel wiedergibt, näher erläutert. Es zeigen:

  • Fig. 1 ein Werkzeug mit Einsteckschaft und Zentrumbohrer zur Hälfte geschnitten,
  • Fig. 2 einen Schnitt entlang der Linie II-II ohne Zentrumbohrer.
The invention is explained below with reference to a drawing which shows an embodiment. Show it:
  • 1 a tool with a shank and center drill cut in half,
  • Fig. 2 shows a section along the line II-II without center drill.

In der Fig. 1 ist ein Werkzeug 1 mit einer Diamantkörner aufweisenden Bohrkrone 15 gezeigt. An einen mit Gewinde 10 versehenen Hohlzylinder (14) schliesst sich endseitig ein Einsteckschaft 2 an.1 shows a tool 1 with a drill bit 15 having diamond grains. An insertion shaft 2 is connected at the end to a hollow cylinder (14) provided with thread 10.

Der Einsteckschaft 2 weist im wesentlichen eine mit der Aufnahmeöffnung eines geeigneten, an sich bekannten und daher nicht dargestellten Werkzeughalters korrespondierende kegelige Kontur mit einem Regelwinkel A auf, der vorzugsweise unter 25° ausgebildet ist. Ein zylindrischer, freier Endabschnitt 12 des Einsteckschaftes 2 korrespondiert im Durchmesser E mit einem ebenfalls nicht dargestellten Bohrungsabschnitt in der Aufnahmehülse eines Werkzeughalters.The insertion shank 2 essentially has a conical contour corresponding to the receiving opening of a suitable tool holder known per se and therefore not shown, with a control angle A, which is preferably designed at 25 °. A cylindrical, free end section 12 of the insertion shaft 2 corresponds in diameter E to a bore section, also not shown, in the receiving sleeve of a tool holder.

Entlang der kegeligen Kontur des Einsteckschaftes 2 verlaufen achsparallel, gleichmässig über den Umfang verteilte Nuten 11 zum formschlüssigen Eingriff von Mitnehmerleisten des nicht dargestellten Werkzeugschaftes. Ferner ist im Bereich der kegeligen Kontur des Einsteckschaftes 2 eine Ringnut 3 vorgesehen, deren Grund durch eine einführungsseitige Flanke B und eine dieser gegenüberliegenden Flanke C gebildet wird. Die Flanke B ist unter einem Winkel D von 30° zur Werkzeugachse geneigt, während die gegenüberliegende Flanke C im wesentlichen rechtwinkelig zur Werkzeugachse verläuft.Along the tapered contour of the insert shaft 2, axially parallel, evenly distributed over the circumference grooves 11 for positive engagement of driver strips of the tool shaft, not shown. Furthermore, an annular groove 3 is provided in the region of the tapered contour of the insertion shaft 2, the base of which is formed by a flank B on the insertion side and a flank C opposite this. The flank B is inclined at an angle D of 30 ° to the tool axis, while the opposite flank C is essentially perpendicular to the tool axis.

Der Einsteckschaft 2 weist eine in Bohrrichtung offene, zentrale Oeffnung 4 mit einer von der Ringnut 3 zur zentralen Oeffnung 4 hin offenen Durchbrechung 5 auf. In dieser Durchbrechung 5 ist ein im wesentlichen radial verschiebbares Verriegelungselement 6 gelagert, dessen Radialerstreckung die Wandstärke F im Durchbrechungsbereich übersteigt. Auf einer um 90° zu der offenen Durchbrechung 5 versetzten Richtung sind in der zentralen Oeffnung 4 zwei Mitnehmerleisten 9 angeordnet. Es ist somit möglich, zentral, innerhalb einer Bohrkrone einen Zentrumbohrer 13 mit entsprechendem Schaft zu befestigen.The insertion shaft 2 has a central opening 4 which is open in the drilling direction and has an opening 5 which is open from the annular groove 3 to the central opening 4. In this opening 5, an essentially radially displaceable locking element 6 is mounted, the radial extent of which exceeds the wall thickness F in the opening area. In a direction offset by 90 ° to the open opening 5, two driver strips 9 are arranged in the central opening 4. It is thus possible to fasten a center drill 13 with a corresponding shaft centrally within a drill bit.

Durch Drehen des Zentrumbohrers 13 gelangen die am Schaft befindlichen, nach hinten offenen Nuten in Deckung mit den Mitnehmerleisten 9, worauf sich dieser einschieben lässt. Gegen Ende der Einschiebebewegung gelangt das im Bereich der Ringnut 3 angeordnete Verriegelungselement 6 durch die gegen die zentrale Oeffnung 4 hin verlaufende Durchbrechung 5 in Eingriff mit der am Schaft des Zentrumbohrers 13 weiters angeordneten, beidseitig geschlossenen Ausnehmung 16. Diese Ausnehmung 16 dient lediglich der axialen Verriegelung des Zentrumbohrers 13 in dem Einsteckschaft 2.By turning the center drill 13, the grooves located on the shaft, which are open to the rear, align with the driver strips 9, whereupon the latter can be inserted. Towards the end of the insertion movement, the locking element 6 arranged in the area of the annular groove 3 comes through the opening 5 running towards the central opening 4 into engagement with the recess 16, which is further arranged on the shaft of the center drill 13 and is closed on both sides. This recess 16 serves only for the axial locking the center drill 13 in the shank 2.

Durch zumindest nahezu radial verlaufende ebene Flanken und zugeordnete Flächen der leistenförmigen Drehmitnehmer 9 ergeben sich sehr gute Verhältnisse, da die zu übertragenden Kräfte nahezu normal auf den zusammenarbeitenden Flächen stehen. Die Kraftübertragung geschieht immer - selbst im Zustand fortgeschrittenen Verschleisses - an Flächen und nicht an Kanten. Durch die kugelförmige Ausbildung des Verriegelungskörpers 6 wird diese Beanspruchung und damit auch der Verschleiss sehr stark herabgesetzt.Very good conditions result from at least almost radially running flat flanks and associated surfaces of the strip-shaped rotary drivers 9, since the forces to be transmitted are almost normal on the cooperating surfaces. The power transmission always happens - even in the state of advanced wear - on surfaces and not on edges. Due to the spherical design of the locking body 6, this stress and thus also the wear is reduced very much.

Die Durchbrechung 5 weist an der Mündung 7 zur zentralen Oeffnung 4 hin eine Querschnittsverengung auf, die das Herausfallen des Verriegelungselementes 6 verhindern. Um das Herausfallen des Verriegelungselementes 6 entgegen der zentralen Oeffnung 4 zu sichern, ist ein Federelement 8 vorgesehen, das als elastischer Ring ausgebildet ist. Dieser kann aus Metall, Kunststoff oder Gummi bestehen. Der Querschnitt kann dabei unterschiedliche Formen aufweisen.The opening 5 has a cross-sectional constriction at the mouth 7 towards the central opening 4, which prevents the locking element 6 from falling out. In order to prevent the locking element 6 from falling out against the central opening 4, a spring element 8 is provided which is designed as an elastic ring. This can be made of metal, plastic or rubber. The cross section can have different shapes.

Claims (7)

Werkzeug mit Einsteckschaft für Werkzeughalter von Bohr- und meisselgeräten, wobei am Einsteckschaft eine Ringnut zum Eingriff tangential verlaufender, zylindrischer Arretierungselemente des Werkzeughalters vorgesehen ist, dadurch gekennzeichnet, dass der Einsteckschaft (2) eine in Bohrrichtung offene, zentrale Öffnung (4) mit wenigstens einer von der Ringnut (3 ) zur zentralen Öffnung (4) hin offenen Durchbrechung (5) aufweist, wobei in wenigstens einer Durchbrechung (5) ein im wesentlichen radial verschiebbares Verriegelungselement (6) gelagert ist, dessen Radialerstreckung die Wandstärke (F) im Durchbrechungsbereich übersteigt.Tool with insertion shaft for tool holders of drilling and chiseling devices, an annular groove for engaging tangentially extending cylindrical locking elements of the tool holder being provided on the insertion shaft, characterized in that the insertion shaft (2) has a central opening (4) open in the drilling direction with at least one has an opening (5) open from the annular groove (3) to the central opening (4), with an essentially radially displaceable locking element (6), the radial extent of which exceeds the wall thickness (F) in the opening area, being mounted in at least one opening (5) . Werkzeug nach Anspruch 1, dadurch gekennzeichnet, dass die Mündung (7) der Durchbrechung (5) zur zentralen Öffnung (4) hin einen kleineren Querschnitt hat, als die Radialprojektion des Verriegelungselementes (6).Tool according to claim 1, characterized in that the opening (7) of the opening (5) towards the central opening (4) has a smaller cross section than the radial projection of the locking element (6). Werkzeug nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass im Bereich der Ringnut (3) ein Federelement (8) als Herausfallsicherung für das Verriegelungselement (6) vorgesehen ist.Tool according to claim 1 or 2, characterized in that in the region of the annular groove (3) a spring element (8) is provided to prevent the locking element (6) from falling out. Werkzeug nach Anspruch 3, dadurch gekennzeichnet, dass das Federelement (8) als elastischer Ring ausgebildet ist.Tool according to claim 3, characterized in that the spring element (8) is designed as an elastic ring. Werkzeug nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Verriegelungselement (6) kugelförmig ausgebildet ist.Tool according to one of claims 1 to 4, characterized in that the locking element (6) is spherical. Werkzeug nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass in der zentralen Oeffnung (4) wenigstens eine mitnehmerleiste (9) zur Drehmitnahme angeordnet ist.Tool according to one of claims 1 to 5, characterized in that at least one driver bar (9) is arranged in the central opening (4) for rotary driving. Werkzeug nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Verriegelungselement (6) von den in die Ringnut (3) eingerückten Arretierungselementen des Werkzeughalters in der in die zentrale Öffnung (4) ragenden Stellung gehalten werden.Tool according to one of Claims 1 to 6, characterized in that the locking element (6) is held in the position projecting into the central opening (4) by the locking elements of the tool holder which are inserted into the annular groove (3).
EP91810638A 1990-09-01 1991-08-13 Subcalibre shaft with central drillholder Expired - Lifetime EP0474591B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4027820A DE4027820A1 (en) 1990-09-01 1990-09-01 INSERTION WITH CENTRAL DRILL HOLE
DE4027820 1990-09-01

Publications (3)

Publication Number Publication Date
EP0474591A2 true EP0474591A2 (en) 1992-03-11
EP0474591A3 EP0474591A3 (en) 1993-02-10
EP0474591B1 EP0474591B1 (en) 1995-12-27

Family

ID=6413448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91810638A Expired - Lifetime EP0474591B1 (en) 1990-09-01 1991-08-13 Subcalibre shaft with central drillholder

Country Status (8)

Country Link
US (1) US5174696A (en)
EP (1) EP0474591B1 (en)
JP (1) JPH06198637A (en)
KR (1) KR920006084A (en)
AT (1) ATE132066T1 (en)
DE (2) DE4027820A1 (en)
DK (1) DK0474591T3 (en)
ES (1) ES2080935T3 (en)

Cited By (2)

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EP0732164A1 (en) * 1995-03-17 1996-09-18 Hawera Probst GmbH Drilling tool, particularly for percusive drilling of stone
CN1047119C (en) * 1992-07-17 1999-12-08 希尔蒂股份公司 Tool bit and tool bit chuck for manually operated tools

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Publication number Priority date Publication date Assignee Title
US6079716A (en) 1997-12-12 2000-06-27 Black & Decker Inc. Removable chuck
US5951026A (en) * 1997-12-12 1999-09-14 Black & Decker Inc. Removable chuck
US6000888A (en) * 1999-02-12 1999-12-14 Snap-On Tools Company Quick coupler mechanism for power tool bits
ATE376468T1 (en) * 2000-09-01 2007-11-15 Credo Tech Corp QUICK-RELEASE SPINDLE UNIT FOR HOLESAW AND DRILL
DE10101451B4 (en) * 2001-01-15 2010-04-01 Robert Bosch Gmbh cutting tool
JP4363019B2 (en) * 2002-09-20 2009-11-11 マックス株式会社 Core bit
DE10324426A1 (en) * 2003-05-30 2004-12-16 Robert Bosch Gmbh Hand tool
DE102005015100A1 (en) * 2005-04-01 2006-10-05 Robert Bosch Gmbh Insert tool and tool holder for a hand tool

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GB1108248A (en) * 1966-05-26 1968-04-03 Balas Collet Company Quick change tool holder
FR2193681A1 (en) * 1972-07-25 1974-02-22 Bosch Gmbh Robert
DE2621898A1 (en) * 1976-05-17 1977-12-01 Rolf Krage Clamp for precision tool with constant shaft dia. - has internally stepped cylindrical housing and tool holder with spherical pressure piece
GB2096045A (en) * 1981-04-03 1982-10-13 Bosch Gmbh Robert A tool holder
DE3220794A1 (en) * 1982-06-03 1983-12-08 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Sleeve-shaped tool holder for hammer drills
DE3434076A1 (en) * 1984-09-17 1986-04-17 Hilti Ag, Schaan TOOL HOLDER FOR DRILLING AND CHISEL TOOLS

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1047119C (en) * 1992-07-17 1999-12-08 希尔蒂股份公司 Tool bit and tool bit chuck for manually operated tools
EP0732164A1 (en) * 1995-03-17 1996-09-18 Hawera Probst GmbH Drilling tool, particularly for percusive drilling of stone
US5788430A (en) * 1995-03-17 1998-08-04 Hawera Probst Gmbh Drilling tool for rotary percussion drilling

Also Published As

Publication number Publication date
JPH06198637A (en) 1994-07-19
DE59107142D1 (en) 1996-02-08
EP0474591A3 (en) 1993-02-10
EP0474591B1 (en) 1995-12-27
US5174696A (en) 1992-12-29
KR920006084A (en) 1992-04-27
ES2080935T3 (en) 1996-02-16
ATE132066T1 (en) 1996-01-15
DK0474591T3 (en) 1996-04-09
DE4027820A1 (en) 1992-03-05

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