EP1122013B1 - Core bit - Google Patents

Core bit Download PDF

Info

Publication number
EP1122013B1
EP1122013B1 EP01810090A EP01810090A EP1122013B1 EP 1122013 B1 EP1122013 B1 EP 1122013B1 EP 01810090 A EP01810090 A EP 01810090A EP 01810090 A EP01810090 A EP 01810090A EP 1122013 B1 EP1122013 B1 EP 1122013B1
Authority
EP
European Patent Office
Prior art keywords
drilling
core
core sleeve
bit according
cylinder
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
EP01810090A
Other languages
German (de)
French (fr)
Other versions
EP1122013A1 (en
Inventor
Rolf Spangenberg
Diep Chau-Ngoc
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
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 Hilti AG filed Critical Hilti AG
Publication of EP1122013A1 publication Critical patent/EP1122013A1/en
Application granted granted Critical
Publication of EP1122013B1 publication Critical patent/EP1122013B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B28D1/02—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

Definitions

  • the invention relates to a drill bit for the production of circular cylindrical recesses or breakthroughs with a drilling cylinder at its end on the direction of drilling Has cutting elements that are at least in the axial projection of the interior of the Extend drilling cylinder.
  • drill bits of the type mentioned at the beginning are used.
  • Drill cylinder of the drill bit are standing, which then broken out with a suitable tool must become.
  • a drill bit of the type described is disclosed, for example, in EP 0776721 A1 It has a drilling cylinder with an axially extending drill in its interior. Cutting elements are arranged on the end face of a longitudinal end of the drilling cylinder, the cutting elements partially radially into the axial projection of the interior extend the drilling cylinder. Because the cutting elements are designed in this way are, the core remaining in the drilling cylinder has a smaller diameter than that Inner diameter of the drilling cylinder. This will jam the core in the drilling cylinder largely prevented. In addition, the drill arranged in the drilling cylinder prevents Tilting the core.
  • the present invention has for its object to provide a drill bit which the core can be easily removed from the drilling cylinder. In addition, it should have simple and economical construction.
  • the object is achieved in that the drilling cylinder has one on the drilling direction side End opposite end open interior with at least one has constant inner contour and a detachable in the interior of the drilling cylinder Core sleeve is arranged, the wall thickness of which is at most the radial extent corresponds to the axial projection of the interior extending part of the cutting element.
  • the core sleeve is detachably arranged in the drilling cylinder, it is after the drilling process possible without problems, the core sleeve together with the core contained in it To remove the drill bit.
  • the drilling cylinder having an opposite end to the drilling direction End open interior with an at least constant inner contour has, the core sleeve can be pulled out of the drilling cylinder against the drilling direction become.
  • An at least constant inner contour is to be understood as that the inside diameter is not decreasing towards the open end, but the same or is increasingly designed so that the removal of the core sleeve from the drilling cylinder the drilling direction is possible.
  • it In order to accommodate the core in the core sleeve, it must have a diameter that is not larger than that of the core sleeve.
  • the wall thickness of the core sleeve is at most the radial extent of the axial Projection of the interior part of the cutting element corresponds, this is guaranteed. Should the core - no longer in exceptional cases, however - no longer be removable from the core sleeve, so is the economic loss due to the lost Core sleeve much less than the loss of the entire drill bit.
  • the core sleeve expediently has at least one, at least partially the length of the longitudinal slot. This is the one removed from the drilling cylinder Core sleeve easier to remove from the core that has stopped and jamming the core in the core sleeve is no longer possible.
  • the longitudinal slot is open towards the end in the direction of the drilling, so that the core can be optimally removed from the core sleeve.
  • the core remains, for example for an analysis of the underground, completely preserved in its structure.
  • Adequate stability of the core sleeve is preferably achieved in that the Outside diameter of the core sleeve is designed such that it on the inner wall of the Drilling cylinder is completely in contact and is smaller in the inserted state than in the not inserted Status. This simultaneously guides the core sleeve in the drilling cylinder and so that a trouble-free extraction of the core sleeve from this enables. It also says the core sleeve inserted into the drilling cylinder under a prestress, which leads to a frictional connection leads between the drilling cylinder and the core sleeve. This will make an undesirable Moving the core sleeve relative to the drilling cylinder, especially during the drilling process avoided.
  • a holding part is arranged to make it easy for the user to pull it out from under one To allow pre-tensioning core sleeve from the drilling cylinder.
  • the Core sleeve advantageously at its end on the direction of drilling in the direction of drilling tapered outer diameter range.
  • the introduced Core sleeve has a pre-tension, is a safe guide when inserting into the drilling cylinder particularly important and makes handling the drill bit easier.
  • the core sleeve has a wall thickness that corresponds to 0.01 to 0.3 times the wall thickness of the drilling cylinder, the production of the drill bit is economical. In addition, such dimensioning of the core sleeve has a positive effect on the manageability of the drill bit.
  • the longitudinal slot preferably has a width which corresponds to 0.001 to 0.01 times the outer diameter of the core sleeve, the core sleeve can be inserted into the drilling cylinder without problems. Since the core sleeve is under a prestress in the inserted state, at least the width of the longitudinal slot must correspond approximately to the difference in the circumference of the core sleeve in the inserted and relaxed state.
  • the core sleeve is expediently made of spring steel in order to optimally hold the Ensure core sleeve in the drilling cylinder.
  • the use of spring steel achieved the necessary stability of the core sleeve.
  • the high elastic limit of spring steel means easier removal when removing the core from the core sleeve and a longer operational readiness.
  • the drawing shows the drill bit according to the invention, the one Has drilling cylinder 1 and a core sleeve 2 running axially in drilling cylinder 1.
  • the drilling cylinder 1 also has cutting elements 3 at the end on the drilling direction, which are radial extend into the axial projection of the interior of the drilling cylinder 1.
  • One on the opposite End of the drill bit arranged cylindrical adapter 7 is by, for example Welding, soldering or gluing connected to the partially enclosed drilling cylinder 1.
  • the adapter 7 is used to connect to a handheld power tool, not shown in the drawing.
  • the torque is determined by several on the outer circumference of the adapter 7 arranged rotary driving 8 from the handheld power tool, not shown in the drawing transferred to the drill bit.
  • the Adapter 7 in the end region on the drilling direction has a stop shoulder designed as a flange 9 on.
  • a longitudinal slot 4 runs from the end on the direction of the drilling over one Most of the length of the core sleeve 2.
  • the core sleeve 2 has an annular holding part 5 and one at the opposite end tapering in the drilling direction outer diameter region 6, which is an insertion bevel forms on.

Abstract

A drill bit for producing circular-cylindrical recesses or boreholes is formed of a drilling cylinder (1) having cutting elements (3) at the leading end in the drilling direction. A detachable core sleeve (2) is arranged in the interior of the drilling cylinder (1). The cutting elements (3) extend radially inwardly at least for the wall thickness (a) of the core sleeve (2). The core sleeve (2) serves to receive a core formed of removed masonry and is intended to facilitate removal of the core from the drill bit. The manageability of the drill bit is substantially improved in this way.

Description

Die Erfindung betrifft eine Bohrkrone zur Herstellung von kreiszylindrischen Ausnehmungen oder Durchbrüchen mit einem Bohrzylinder, der an seinem bohrrichtungsseitigen Ende Schneidelemente aufweist, die sich zumindest in die axiale Projektion des Innenraumes des Bohrzylinders erstrecken.The invention relates to a drill bit for the production of circular cylindrical recesses or breakthroughs with a drilling cylinder at its end on the direction of drilling Has cutting elements that are at least in the axial projection of the interior of the Extend drilling cylinder.

Zum Herstellen von grossen Bohrungen und Durchbrüchen, insbesondere in Mauerwerk, Beton oder Gestein, werden Bohrkronen der eingangs erwähnten Art verwendet. Beim Ausbohren der betreffenden Bohrungen und Durchbrüche bleibt zunächst ein innerer Kern im Bohrzylinder der Bohrkrone stehen, der anschliessend mit einem geeigneten Werkzeug herausgebrochen werden muss.For making large holes and openings, especially in masonry, Concrete or stone, drill bits of the type mentioned at the beginning are used. When drilling out of the holes and breakthroughs in question initially remains an inner core in Drill cylinder of the drill bit are standing, which then broken out with a suitable tool must become.

Eine Bohrkrone der beschriebenen Art ist beispielsweise in der EP 0776721 A1 offenbart Sie weist einen Bohrzylinder mit einem, in dessen Innenraum, axial verlaufenden Bohrer auf. An einem Längsende des Bohrzylinders sind an der Stirnfläche Schneidelemente angeordnet, wobei die Schneidelemente sich teilweise radial in die axiale Projektion des Innenraumes des Bohrzylinders erstrecken. Dadurch, dass die Schneidelemente derart ausgebildet sind, weist der im Bohrzylinder stehen gebliebene Kern einen kleineren Durchmesser als der Innendurchmesser des Bohrzylinders auf. Somit wird ein Verklemmen des Kerns im Bohrzylinder grösstenteils verhindert. Zudem verhindert der im Bohrzylinder angeordnete Bohrer ein Verkanten des Kerns.A drill bit of the type described is disclosed, for example, in EP 0776721 A1 It has a drilling cylinder with an axially extending drill in its interior. Cutting elements are arranged on the end face of a longitudinal end of the drilling cylinder, the cutting elements partially radially into the axial projection of the interior extend the drilling cylinder. Because the cutting elements are designed in this way are, the core remaining in the drilling cylinder has a smaller diameter than that Inner diameter of the drilling cylinder. This will jam the core in the drilling cylinder largely prevented. In addition, the drill arranged in the drilling cylinder prevents Tilting the core.

Nachteilig bei dieser bekannten Bohrkrone ist, dass das durch den Bohrvorgang entstandene Bohrklein oder ein Zerbrechen des im Bohrzylinder enthaltenen Kerns, ein Verklemmen des Kerns in der Bohrkrone verursachen kann. Somit muss in diesem Fall der Kern, beispielsweise mittels geeigneter Werkzeuge, aus dem Bohrzylinder herausgebrochen werden. Dabei besteht die Gefahr, dass die Bohrkrone beispielsweise beschädigt wird und somit nicht mehr einsatzfähig ist. Darüber hinaus nimmt der Bohrvorgang dadurch mehr Zeit in Anspruch, was sich wirtschaftlich negativ auswirkt.It is a disadvantage of this known drill bit that the drilling process results Cuttings or a breakage of the core contained in the drilling cylinder, jamming of the Core in the drill bit. So in this case the core, for example be broken out of the drilling cylinder using suitable tools. there there is a risk that the drill bit will be damaged, for example, and therefore no longer is operational. In addition, the drilling process takes more time, what has an economically negative impact.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Bohrkrone zu schaffen, bei welcher der Kern problemlos aus dem Bohrzylinder entfernbar ist. Zusätzlich soll sie eine einfache und wirtschaftliche Konstruktion aufweisen.The present invention has for its object to provide a drill bit which the core can be easily removed from the drilling cylinder. In addition, it should have simple and economical construction.

Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass der Bohrzylinder einen zum bohrrichtungsseitigen Ende entgegengesetzten Ende hin offenen Innenraum mit einer zumindest gleichbleibenden Innenkontur aufweist und im Innenraum des Bohrzylinders eine lösbare Kernhülse angeordnet ist, deren Wandstärke höchstens der radialen Ausdehnung, des sich in die axiale Projektion des Innenraumes erstreckenden Teiles des Schneidelementes entspricht.According to the invention, the object is achieved in that the drilling cylinder has one on the drilling direction side End opposite end open interior with at least one has constant inner contour and a detachable in the interior of the drilling cylinder Core sleeve is arranged, the wall thickness of which is at most the radial extent corresponds to the axial projection of the interior extending part of the cutting element.

Dadurch, dass die Kernhülse lösbar im Bohrzylinder angeordnet ist, ist es nach dem Bohrvorgang ohne Probleme möglich, die Kernhülse samt dem darin enthaltenen Kern aus der Bohrkrone zu entfernen. Indem der Bohrzylinder einen zum bohrrichtungsseitigen Ende entgegengesetzten Ende hin offenen Innenraum mit einer zumindest gleichbleibenden Innenkontur aufweist, kann die Kernhülse entgegen der Bohrrichtung aus dem Bohrzylinder herausgezogen werden. Unter einer zumindest gleichbleibenden Innenkontur ist zu verstehen, dass der Innendurchmesser zum offenen Ende hin nicht abnehmend, sondern gleich oder zunehmend ausgebildet ist, sodass die Entfernung der Kernhülse aus dem Bohrzylinder entgegen der Bohrrichtung möglich ist. Um den Kern in der Kernhülse aufzunehmen, muss dieser einen Durchmesser aufweisen, der nicht grösser als derjenige der Kernhülse ist. Indem die Wandstärke der Kernhülse höchstens der radialen Ausdehnung des sich in die axiale Projektion des Innenraumes erstreckenden Teiles des Schneidelementes entspricht, ist dies gewährleistet. Sollte der Kern - in allerdings kaum eintretenden Ausnahmefällen - nicht mehr aus der Kemhülse entfernbar sein, so ist der wirtschaftliche Verlust durch die verlorene Kernhülse wesentlich geringer als der Verlust der gesamten Bohrkrone.Because the core sleeve is detachably arranged in the drilling cylinder, it is after the drilling process possible without problems, the core sleeve together with the core contained in it To remove the drill bit. By the drilling cylinder having an opposite end to the drilling direction End open interior with an at least constant inner contour has, the core sleeve can be pulled out of the drilling cylinder against the drilling direction become. An at least constant inner contour is to be understood as that the inside diameter is not decreasing towards the open end, but the same or is increasingly designed so that the removal of the core sleeve from the drilling cylinder the drilling direction is possible. In order to accommodate the core in the core sleeve, it must have a diameter that is not larger than that of the core sleeve. By doing the wall thickness of the core sleeve is at most the radial extent of the axial Projection of the interior part of the cutting element corresponds, this is guaranteed. Should the core - no longer in exceptional cases, however - no longer be removable from the core sleeve, so is the economic loss due to the lost Core sleeve much less than the loss of the entire drill bit.

Die Kernhülse weist zweckmässigerweise zumindest einen, sich zumindest teilweise über deren Länge erstreckenden Längsschlitz auf. Damit ist die aus dem Bohrzylinder herausgenommene Kernhülse leichter vom stehen gebliebenen Kern entfernbar und ein Verklemmen des Kerns in der Kernhülse ist nicht mehr möglich.The core sleeve expediently has at least one, at least partially the length of the longitudinal slot. This is the one removed from the drilling cylinder Core sleeve easier to remove from the core that has stopped and jamming the core in the core sleeve is no longer possible.

Vorteilhafterweise ist der Längsschlitz zum bohrrichtungsseitigen Ende hin offen, damit ist der Kern optimal aus der Kernhülse entfernbar. Ausserdem bleibt der Kern, beispielsweise für eine Analyse des Untergrundes, in seinem Aufbau vollständig erhalten. Advantageously, the longitudinal slot is open towards the end in the direction of the drilling, so that the core can be optimally removed from the core sleeve. In addition, the core remains, for example for an analysis of the underground, completely preserved in its structure.

Eine ausreichende Stabilität der Kemhülse wird vorzugsweise dadurch erreicht, dass der Aussendurchmesser der Kernhülse derart ausgebildet ist, dass diese an der Innenwand des Bohrzylinders vollständig anliegt und im eingeführten Zustand kleiner ist als im nicht eingeführten Zustand. Damit wird gleichzeitig eine Führung der Kemhülse im Bohrzylinder und damit ein störungsfreies Herausziehen der Kernhülse aus diesem ermöglicht. Zudem steht die in den Bohrzylinder eingeführte Kernhülse unter einer Vorspannung, was zu einem Reibschluss zwischen dem Bohrzylinder und der Kernhülse führt. Damit wird ein unerwünschtes Versetzen der Kernhülse gegenüber dem Bohrzylinder insbesondere während des Bohrvorganges vermieden.Adequate stability of the core sleeve is preferably achieved in that the Outside diameter of the core sleeve is designed such that it on the inner wall of the Drilling cylinder is completely in contact and is smaller in the inserted state than in the not inserted Status. This simultaneously guides the core sleeve in the drilling cylinder and so that a trouble-free extraction of the core sleeve from this enables. It also says the core sleeve inserted into the drilling cylinder under a prestress, which leads to a frictional connection leads between the drilling cylinder and the core sleeve. This will make an undesirable Moving the core sleeve relative to the drilling cylinder, especially during the drilling process avoided.

Zweckmässigerweise ist am bohrrichtungsseitig gegenüberliegenden Ende der Kernhülse ein Halteteil angeordnet, um dem Anwender ein einfaches Herausziehen der unter einer Vorspannung stehenden Kernhülse aus dem Bohrzylinder zu ermöglichen.It is expedient to have the core sleeve at the opposite end of the drilling direction a holding part is arranged to make it easy for the user to pull it out from under one To allow pre-tensioning core sleeve from the drilling cylinder.

Um ein sicheres Einführen der Kemhülse in den Bohrzylinder zu gewährleisten, weist die Kernhülse vorteilhafterweise an ihrem bohrrichtungsseitigen Ende einen in Bohrrichtung verjüngten Aussendurchmesser-Bereich auf. Insbesondere dadurch, dass die eingeführte Kernhülse eine Vorspannung besitzt, ist eine sichere Führung beim Einführen in den Bohrzylinder besonders wichtig und erleichtert die Handhabung der Bohrkrone.In order to ensure a safe insertion of the core sleeve into the drilling cylinder, the Core sleeve advantageously at its end on the direction of drilling in the direction of drilling tapered outer diameter range. In particular, that the introduced Core sleeve has a pre-tension, is a safe guide when inserting into the drilling cylinder particularly important and makes handling the drill bit easier.

Indem, dass die Kernhülse eine Wandstärke aufweist, die dem 0,01 bis 0,3-fachen der Wandstärke des Bohrzylinders entspricht, ist die Herstellung der Bohrkrone wirtschaftlich. Ausserdem wirkt sich eine solche Dimensionierung der Kernhülse positiv auf die Handbarkeit der Bohrkrone aus.Since the core sleeve has a wall thickness that corresponds to 0.01 to 0.3 times the wall thickness of the drilling cylinder, the production of the drill bit is economical. In addition, such dimensioning of the core sleeve has a positive effect on the manageability of the drill bit.

Dadurch, dass der Längsschlitz vorzugsweise eine Breite aufweist, die dem 0,001 bis 0,01-fachen des Aussendurchmessers der Kernhülse entspricht, kann die Kernhülse ohne Probleme in den Bohrzylinder eingeführt werden. Da die Kernhülse im eingeführten Zustand unter einer Vorspannung steht, muss zumindest die Breite des Längsschlitzes etwa der Differenz des Umfanges der Kernhülse im eingeführten und entspannten Zustand entsprechen.Because the longitudinal slot preferably has a width which corresponds to 0.001 to 0.01 times the outer diameter of the core sleeve, the core sleeve can be inserted into the drilling cylinder without problems. Since the core sleeve is under a prestress in the inserted state, at least the width of the longitudinal slot must correspond approximately to the difference in the circumference of the core sleeve in the inserted and relaxed state.

Zweckmässigerweise besteht die Kernhülse aus Federstahl, um einen optimalen Halt der Kernhülse im Bohrzylinder zu gewährleisten. Zugleich wird durch die Verwendung von Federstahl die nötige Stabilität der Kemhülse erreicht. Die hohe Elastizitätsgrenze des Federstahls bedeutet bei der Entfernung des Kernes aus der Kernhülse eine einfachere Handhabung und eine längere Einsatzbereitschaft. The core sleeve is expediently made of spring steel in order to optimally hold the Ensure core sleeve in the drilling cylinder. At the same time, the use of spring steel achieved the necessary stability of the core sleeve. The high elastic limit of spring steel means easier removal when removing the core from the core sleeve and a longer operational readiness.

Die Erfindung wird nachstehend anhand einer Zeichnung, die ein Ausführungsbeispiel näher erläutert, dargestellt.The invention is described below with reference to a drawing, which shows an exemplary embodiment explained, illustrated.

Teilweise im Längsschnitt zeigt die Zeichnung die erfindungsgemässe Bohrkrone, die einen Bohrzylinder 1 und eine axial im Bohrzylinder 1 verlaufende Kernhülse 2 aufweist. Der Bohrzylinder 1 weist zudem am bohrrichtungsseitigen Ende Schneidelemente 3 auf, die sich radial in die axiale Projektion des Innenraumes des Bohrzylinders 1 erstrecken. Ein am gegenüberliegenden Ende der Bohrkrone angeordneter zylinderförmiger Adapter 7 ist durch beispielsweise Schweissen, Löten oder Kleben mit dem teilweise umfassten Bohrzylinder 1 verbunden.Partially in longitudinal section, the drawing shows the drill bit according to the invention, the one Has drilling cylinder 1 and a core sleeve 2 running axially in drilling cylinder 1. The drilling cylinder 1 also has cutting elements 3 at the end on the drilling direction, which are radial extend into the axial projection of the interior of the drilling cylinder 1. One on the opposite End of the drill bit arranged cylindrical adapter 7 is by, for example Welding, soldering or gluing connected to the partially enclosed drilling cylinder 1.

Der Adapter 7 dient dem Anschluss an eine, zeichnerisch nicht dargestellte, Handwerkzeugmaschine. Das Drehmoment wird durch mehrere am Aussenumfang des Adapters 7 angeordneten Drehmitnahmen 8 von der, zeichnerisch nicht dargestellten, Handwerkzeugmaschine auf die Bohrkrone übertragen. Anschliessend an die Drehmitnahmen 8 weist der Adapter 7 im bohrrichtungsseitigen Endbereich eine als Flansch ausgebildete Anschlagschulter 9 auf.The adapter 7 is used to connect to a handheld power tool, not shown in the drawing. The torque is determined by several on the outer circumference of the adapter 7 arranged rotary driving 8 from the handheld power tool, not shown in the drawing transferred to the drill bit. Following the rotary driver 8, the Adapter 7 in the end region on the drilling direction has a stop shoulder designed as a flange 9 on.

Die in den eine zylinderförmige Innenkontur aufweisenden, Bohrzylinder 1 eingesetzte Kernhülse 2, bestehend aus Federstahl, weist eine derartige Wandstärke a auf, dass die Ausdehnung b der axialen Projektion der in den Bohrzylinder 1 hineinragenden Schneidelemente 3 dieser entspricht. Ein Längsschlitz 4 verläuft vom bohrrichtungsseitigen Ende über einen Grossteil der Länge der Kernhülse 2. Am bohrrichtungsseitig gegenüberliegenden Ende weist die Kernhülse 2 ein ringförmiges Halteteil 5 und am gegenüberliegenden Ende einen sich in Bohrrichtung verjüngenden Aussendurchmesser-Bereich 6, der eine Einführschräge bildet, auf.The core sleeve inserted into the drilling cylinder 1, which has a cylindrical inner contour 2, consisting of spring steel, has a wall thickness a such that the expansion b the axial projection of the cutting elements 3 protruding into the drilling cylinder 1 this corresponds. A longitudinal slot 4 runs from the end on the direction of the drilling over one Most of the length of the core sleeve 2. At the opposite end of the drilling direction the core sleeve 2 has an annular holding part 5 and one at the opposite end tapering in the drilling direction outer diameter region 6, which is an insertion bevel forms on.

Claims (9)

  1. Core bit for producing circular cylindrical cutouts or breakthroughs by means of a drilling cylinder (1) having at its drilling end cutting elements (3) which extend at least into the axial projection of the inner space of the drilling cylinder (1), characterised in that the drilling cylinder (1) comprises an inside space which is open towards the end opposite the end at the drilling side with an at least unchanging inside contour, and in the inside area of the drilling cylinder (1) is arranged a releasable core sleeve (2) the wall thickness (a) of which corresponds at most with the radial extent of the portion (b) of cutting element (3) which extends into the axial projection of the inside area.
  2. Core bit according to Claim 1, characterised in that the core sleeve (2) comprises at least one longitudinal slot (4) which extends at least partially over its length.
  3. Core bit according to Claim 2, characterised in that the longitudinal slot (4) is open towards the end at the drilling side.
  4. Core bit according to one of Claims 1 to 3, characterised in that the outside diameter of the core sleeve (2) is designed in such a manner that it fully abuts the inside wall of the drilling cylinder (1) and has, whilst inserted thereinto, a smaller diameter then in a not inserted state.
  5. Core bit according to one of Claims 1 to 4, characterised in that the core sleeve (2) has a support element (5) at its end opposite the end of the drilling side.
  6. Core bit according to one of Claims 1 to 5, characterised in that the core sleeve (2) has at its end at the drilling side an outside diameter area (6) which narrows in the drilling direction.
  7. Core bit according to one of Claims 1 to 6, characterised in that the core sleeve (2) has a wall thickness corresponding with 0.01 to 0.3 times the wall thickness of the drilling cylinder (1).
  8. Core bit according to one of Claims 2 to 7, characterised in that the longitudinal slot (4) has a width which corresponds with 0.001 to 0.01 times the outside diameter of the core sleeve (2).
  9. Core bit according to one of Claims 1 to 8, characterised in that the core sleeve (2) is made of spring steel.
EP01810090A 2000-02-07 2001-01-30 Core bit Expired - Lifetime EP1122013B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10005365A DE10005365A1 (en) 2000-02-07 2000-02-07 Core bit
DE10005365 2000-02-07

Publications (2)

Publication Number Publication Date
EP1122013A1 EP1122013A1 (en) 2001-08-08
EP1122013B1 true EP1122013B1 (en) 2003-05-02

Family

ID=7630115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01810090A Expired - Lifetime EP1122013B1 (en) 2000-02-07 2001-01-30 Core bit

Country Status (5)

Country Link
US (1) US6382202B2 (en)
EP (1) EP1122013B1 (en)
AT (1) ATE238869T1 (en)
DE (2) DE10005365A1 (en)
DK (1) DK1122013T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4363019B2 (en) * 2002-09-20 2009-11-11 マックス株式会社 Core bit
US7204244B1 (en) 2006-03-02 2007-04-17 Luminare Supply Corporation Diamond core drill bit
WO2018102719A2 (en) * 2016-12-02 2018-06-07 Saint-Gobain Abrasives, Inc. Core drill bit assembly

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2923180A (en) * 1956-12-14 1960-02-02 Newport News S & D Co Insulation cutting tool
US3778179A (en) * 1972-09-06 1973-12-11 D Rivas Dual replaceable holesaw bit
US3978733A (en) * 1974-03-08 1976-09-07 F. A. P. M. O. Sampler for extracting core samples
US4131384A (en) * 1977-09-08 1978-12-26 Hougen Everett D Arbor for annular hole cutter
US4193721A (en) * 1978-11-22 1980-03-18 Hougen Everett D Arbor for annular hole cutter
US4696308A (en) * 1986-04-09 1987-09-29 The Cleveland Clinic Foundation Core sampling apparatus
US4785826A (en) * 1987-03-02 1988-11-22 Ward John L Biopsy instrument
DE4031755A1 (en) * 1990-10-06 1992-04-09 Bosch Gmbh Robert HOLLOW DRILLING TOOL
US5316416A (en) * 1992-09-29 1994-05-31 Ehwa Diamond Ind. Co., Ltd. Diamond cutting tool for hard articles
US5813802A (en) * 1995-11-30 1998-09-29 House B.M. Co., Ltd. Drilling tool assembly and its center drill and cup shape drill

Also Published As

Publication number Publication date
DE50100195D1 (en) 2003-06-05
DE10005365A1 (en) 2001-08-09
EP1122013A1 (en) 2001-08-08
US6382202B2 (en) 2002-05-07
DK1122013T3 (en) 2003-08-25
US20010025638A1 (en) 2001-10-04
ATE238869T1 (en) 2003-05-15

Similar Documents

Publication Publication Date Title
EP0275890B1 (en) Round shank pick
EP1602452B1 (en) Shank for a percussive and/or rotary tool
DE3310147C2 (en)
DE3009592A1 (en) COMBINATION TOOL
EP2428297A1 (en) Collet chuck
EP0579577A1 (en) Tool and chuck for a portable tool
EP0572607B1 (en) Device for inserting and setting self-drilling blind tension rivets
DE3004568A1 (en) CUTTING TOOL WITH A REPLACEABLE CARBIDE CUTTING INSERT
EP1537956B1 (en) Shank for a percussion, rotary, or rotary percussion tool
EP0450135A1 (en) Hand-drill for drilling-out of spot-welds
EP1122013B1 (en) Core bit
CH615823A5 (en)
DE10040562C2 (en) Attack cutting tools
DE1427740A1 (en) Device for driving expansion sleeves into concrete, masonry, etc.
DE2613309C3 (en) Device for fastening and releasing the lock between a work spindle and a tapered tool shank inserted in its receptacle
DE102011005903A1 (en) Drill bit removal tool from hammer drill bits
DE2836747C3 (en) Drill stabilizer
DE1980712U (en) DEVICE FOR DRILLING HOLES IN A MOUNTAIN COVERED BY SOIL OR LOOSE ROCK.
DE3322887A1 (en) Rock-drilling tool
DE3807225A1 (en) Holder for a drilling tool
DE2627570A1 (en) HAMMER, CHISEL OR DRILL
DE2948682A1 (en) Portable drill with dust-exhaustion equipment - has rear end of bit protruding into transverse passage in chuck
EP0201723A2 (en) Drilling tool with a replaceable conveying spiral
DE2855284A1 (en) DEVICE FOR FASTENING WORK TOOLS WITH IMPACT EFFECT
EP0491153B1 (en) Holder for a drill

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20020208

AKX Designation fees paid

Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 20030502

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20030502

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20030502

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20030502

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030502

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 50100195

Country of ref document: DE

Date of ref document: 20030605

Kind code of ref document: P

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: GERMAN

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20030802

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20030804

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20030813

REG Reference to a national code

Ref country code: DK

Ref legal event code: T3

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

Ref document number: 1122013E

Country of ref document: IE

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040131

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20040203

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20060103

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20060111

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DK

Payment date: 20060118

Year of fee payment: 6

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20070801

REG Reference to a national code

Ref country code: DK

Ref legal event code: EBP

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070131

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070801

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20080129

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20080104

Year of fee payment: 8

Ref country code: GB

Payment date: 20080130

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20080108

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20080403

Year of fee payment: 8

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20090130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090801

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090131

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090131

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20091030

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090202

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20160112

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170131