WO1992012837A1 - Hollow drill - Google Patents

Hollow drill Download PDF

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Publication number
WO1992012837A1
WO1992012837A1 PCT/AT1991/000136 AT9100136W WO9212837A1 WO 1992012837 A1 WO1992012837 A1 WO 1992012837A1 AT 9100136 W AT9100136 W AT 9100136W WO 9212837 A1 WO9212837 A1 WO 9212837A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting ring
drill
diameter
hollow drill
hollow
Prior art date
Application number
PCT/AT1991/000136
Other languages
German (de)
French (fr)
Inventor
Johann Pfister
Günter WEIS
Original Assignee
Tyrolit Schleifmittelwerke Swarovski K.G.
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 Tyrolit Schleifmittelwerke Swarovski K.G. filed Critical Tyrolit Schleifmittelwerke Swarovski K.G.
Publication of WO1992012837A1 publication Critical patent/WO1992012837A1/en

Links

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

  • Hollow drill The invention relates to a hollow drill with a preferably metallic support tube with a cutting ring which preferably has diamond as an abrasive grain and a metallic binder and which defines a drill core to be cut out of the workpiece, areas on the inside of the cutting ring defining a circle whose diameter is smaller is the inside diameter of the rest of the cutting ring.
  • Hollow drills of this type are widely used, for example, in construction. Openings in walls or floors which were previously worked out by chisel work are now drilled with such hollow drills. Examples of this are openings for sockets and switches but also through holes for
  • Such drills generally have a smaller diameter than hollow drills which are used for drilling masonry.
  • Drills with a small diameter are generally provided with a continuous cutting ring.
  • a problem that arises, for example, when drilling laminated glass is that a drill core is formed in the carrier tube. This is due to the fact that the individual glass layers are held together by an adhesive or adhesive film. This drilling core prevents or reduces the passage of the cooling liquid, as a result of which the drilling performance and the service life of the drilling tool are substantially reduced.
  • Examples of such hollow drills can be found in DE-B2 20 31 094 and US Pat. No. 3,494,348.
  • For drill bits used in glass it is important that the edge of the hole does not break out. This is for a drill according to DE-AS 20 31 094 not because the eccentric drill vibrates, which just leads to a breakout at the edge of the hole.
  • the eccentricity which alone guarantees a drill core with a smaller diameter, does not persist over the entire service life of the drill.
  • the slip ring grinds itself in.
  • a drill according to US Pat. No. 3,494,348 also has the problem that the edge of the bore breaks out easily in the case of a material such as glass, since the knobs are always arranged on the outside of the cutting or grinding ring. Such a drill is also not true to size, since the outer knobs wear out very quickly.
  • the object of the invention is to improve a hollow drill of the type mentioned at the outset in such a way that the formation of a drill core during drilling is prevented or the removal of such a drill core is facilitated such that the edge of the bore does not break out and that the dimensional accuracy is prolonged Commitment remains.
  • the object according to the invention is achieved in that the cutting ring is conical on the inside, the inner wall converging in the drilling direction.
  • Another embodiment of the invention provides that the cutting ring describes a continuous circle on the outside and knobs or the like on the inside. which define the diameter of the drill core.
  • the drill remains intact for a long time.
  • An embodiment of the invention provides that the slip ring is pierced by at least one slot extending transversely to the direction of drilling, which is aligned with the diagonal leads through the slot, encloses an angle. Such slots tear the film layer which holds the individual glass layers together, so that the formation of a compact drill core is prevented.
  • FIG. 1 shows a side view of a hollow drill according to the invention
  • FIG. 2 shows a plan view of the slip ring of a hollow drill according to the invention
  • FIG. 3 shows a section through the longitudinal central axis of a hollow drill according to the invention
  • FIG. 4 shows a diagram of the front area of a hollow drill according to a further exemplary embodiment
  • FIG. 5 shows a section through a laminated glass plate.
  • the hollow drill according to the invention has a metallic carrier tube 1, at the front end of which the cutting ring 2 is located.
  • the cutting ring 2 preferably has a metallic bond and is provided with abrasive grains 3, for example diamond grains.
  • the carrier body is provided with a thread 5, by means of which it can be screwed into a drill chuck of a drilling machine. Furthermore, the hollow drill has a hexagon 6, which enables a wrench to be attacked.
  • the slip ring 2 is provided with knobs 7 inside.
  • the knobs 7 can be uniform in the axial direction or taper towards the rear.
  • the knobs 7 effect the formation of a drill core 8 in the glass plate 9 to be drilled, the diameter of which is substantially smaller than the inside diameter of the carrier body 1. This is the Drill core 8 can be easily removed from the carrier body and does not prevent the coolant from flowing through the carrier tube 1.
  • the slip ring 2 is designed conically, the inner wall 10 in the drilling direction, ie. H. converges forward.
  • a drill core 8 is also achieved with such a hollow drill, the diameter of which is substantially smaller than the inside diameter of the carrier body 1.
  • the slip ring regardless of whether it has knobs 7 or a conical inner wall 10, can be provided with slots 11 which are not aligned radially. Such slots 11 tear the plastic or adhesive film 13 arranged between the glass layers 12 and in this way prevent the formation of a compact drill core.

Abstract

A hollow drill has a metallic supporting tube (1) and a cutting ring (2) that contains diamond as abrasive grit and a metallic binder. The cutting ring (2) defines a core to be cut out of the workpiece. Points or areas of the inner face of the cutting ring (2) define a circle with a smaller diameter than the inner diameter of the remaining cutting ring (2). The inner side of the cutting ring (2) being conically shaped or its inner wall is provided with bosses (7). The outer side of the cutting ring (2) describes a cylinder.

Description

Hohlbohrer Die Erfindung bezieht sich auf einen Hohlbohrer mit einem vorzugsweise metallischen Trägerrohr mit einem Schneidring der vorzugsweise Diamant als Schleifkorn und ein metallisches Bindemittel aufweist und der einen aus dem Werkstück auszuschneidenden Bohrkern definiert, wobei Bereiche an der Innenseite des Schneidringes einen Kreis definieren, dessen Durchmesser kleiner ist als der Innendurchmesser des restlichen Schneidringes. Hollow drill The invention relates to a hollow drill with a preferably metallic support tube with a cutting ring which preferably has diamond as an abrasive grain and a metallic binder and which defines a drill core to be cut out of the workpiece, areas on the inside of the cutting ring defining a circle whose diameter is smaller is the inside diameter of the rest of the cutting ring.
Derartige Hohlbohrer finden beispielsweise im Bauwesen weitver¬ breitete Verwendung. Öffnungen in Wänden oder Böden, die früher durch Meiβelarbeit ausgearbeitet wurden, werden nun mit derarti¬ gen Hohlbohrern gebohrt. Beispiele dafür sind Öffnungen für Steckdosen und Schalter aber auch durchgehende Bohrungen zumHollow drills of this type are widely used, for example, in construction. Openings in walls or floors which were previously worked out by chisel work are now drilled with such hollow drills. Examples of this are openings for sockets and switches but also through holes for
Verlegen von Installationsrohren und Kabeln sowie Lüftungslei¬ tungen. Weiters können mittels nebeneinander angeordneter Boh¬ rungen größere Durchbrüche geschaffen werden.Laying installation pipes and cables as well as ventilation lines. Furthermore, larger openings can be created by means of holes arranged side by side.
Des weiteren finden derartige Bohrer auch beim Durchbohren vonFurthermore, such drills are also found when drilling through
Glasverbundscheiben Verwendung. Derartige Bohrer haben im allge¬ meinen einen kleineren Durchmesser als Hohlbohrer, die zum Boh¬ ren von Mauerwerk verwendet werden.Glass composite panes use. Such drills generally have a smaller diameter than hollow drills which are used for drilling masonry.
Bohrer mit einem kleinen Durchmesser sind im allgemeinen mit ei¬ nem durchgehenden Schneidring versehen. Ein Problem das bei¬ spielsweise beim Bohren von Verbundglas auftritt ist, daß sich im Trägerrohr ein Bohrkern bildet. Dies ist darauf zurückzufüh¬ ren, daß die einzelnen Glaslagen durch eine Klebemasse oder Kle- befolie zusammengehalten werden. Dieser Bohrkern verhindert oder vermindert den Durchtritt der Kühlflüssigkeit, wodurch die Bohr¬ leistung und die Lebensdauer des Bohrwerkzeuges wesentlich her¬ abgesetzt wird.Drills with a small diameter are generally provided with a continuous cutting ring. A problem that arises, for example, when drilling laminated glass is that a drill core is formed in the carrier tube. This is due to the fact that the individual glass layers are held together by an adhesive or adhesive film. This drilling core prevents or reduces the passage of the cooling liquid, as a result of which the drilling performance and the service life of the drilling tool are substantially reduced.
Beispiele für derartige Hohlbohrer sind der DE-B2 20 31 094 und der US-PS 3,494,348 zu entnehmen. Bei Bohrern, die bei Glas zum Einsatz kommen, ist es wichtig, daß der Bohrungsrand nicht ausbricht. Dies ist bei einem Bohrer gemäß der DE-AS 20 31 094 nicht der Fall, da der exzentrische Bohrer vibriert, was eben zu einem Ausbrechen am Bohrungsrand führt. Daruberhinaus bleibt die Exzentrizität, die allein einen Bohrkern mit geringerem Durchmesser garantiert, nicht über die gesamte Lebensdauer des Bohrers bestehen. Der Schleifring schleift sich ein. Ein Bohrer gemäß der US-PS 3,494,348 bringt ebenfalls das Problem mit sich, daß der Bohrungsrand bei einem Material wie Glas leicht ausbricht, da die Noppen immer an der Außenseite des Schneid¬ bzw. Schleifringes angeordnet sind. Ein derartiger Bohrer ist außerdem nicht maßhaltig, da sich die äußeren Noppen sehr schnell abnützen.Examples of such hollow drills can be found in DE-B2 20 31 094 and US Pat. No. 3,494,348. For drill bits used in glass, it is important that the edge of the hole does not break out. This is for a drill according to DE-AS 20 31 094 not because the eccentric drill vibrates, which just leads to a breakout at the edge of the hole. In addition, the eccentricity, which alone guarantees a drill core with a smaller diameter, does not persist over the entire service life of the drill. The slip ring grinds itself in. A drill according to US Pat. No. 3,494,348 also has the problem that the edge of the bore breaks out easily in the case of a material such as glass, since the knobs are always arranged on the outside of the cutting or grinding ring. Such a drill is also not true to size, since the outer knobs wear out very quickly.
Aufgabe der Erfindung ist es, einen Hohlbohrer der eingangs er¬ wähnten Art derart zu verbessern, daß die Bildung eines Bohr- kernes während des Bohrens verhindert bzw. das Entfernen eines derartigen Bohrkernes erleichtert wird, daß der Bohrungsrand nicht ausbricht und daß die Maßgenauigkeit bei längerem Einsatz erhalten bleibt.The object of the invention is to improve a hollow drill of the type mentioned at the outset in such a way that the formation of a drill core during drilling is prevented or the removal of such a drill core is facilitated such that the edge of the bore does not break out and that the dimensional accuracy is prolonged Commitment remains.
Die erfindungsgemäβe Aufgabe wird dadurch gelöst, daß der Schneidring innen konisch ist, wobei die Innenwand in der Bohrrichtung konvergiert.The object according to the invention is achieved in that the cutting ring is conical on the inside, the inner wall converging in the drilling direction.
Ein weiteres Ausführungsbeispiel der Erfindung sieht vor, daß der Schneidring außen einen durchgehenden Kreis beschreibt und an der Innenseite Noppen od.dgl. aufweist, die den Durchmesser des Bohrkernes definieren.Another embodiment of the invention provides that the cutting ring describes a continuous circle on the outside and knobs or the like on the inside. which define the diameter of the drill core.
Bei beiden Ausführungen des Bohrers wird ein Bohrkern erhalten, dessen Durchmesser wesentlich geringer als der Innendurchmesser des Trägerrohres ist, sodaß dieser Bohrkern nicht im Hohlbohrer gehalten werden kann und auch nicht eine vollständige Abdichtung für die Kühlflüssigkeit bildet. Die äußere Maßhaltigkeit desIn both versions of the drill, a drill core is obtained, the diameter of which is substantially smaller than the inner diameter of the carrier tube, so that this drill core cannot be held in the hollow drill and does not form a complete seal for the coolant. The external dimensional accuracy of the
Bohrers bleibt über lange Zeit erhalten.The drill remains intact for a long time.
Ein Ausführungsbeispiel der Erfindung sieht vor, daß der Schleifring von mindestens einem quer zur Bohrrichtung verlau¬ fenden Schlitz durchbrochen wird, der mit der Diagonalen, die durch den Schlitz führt, einen Winkel einschließt. Derartige Schlitze zerreißen die Folienschichte, die die einzelnen Glasla¬ gen zusammenhält, sodaß die Bildung eines kompakten Bohrkernes verhindert wird.An embodiment of the invention provides that the slip ring is pierced by at least one slot extending transversely to the direction of drilling, which is aligned with the diagonal leads through the slot, encloses an angle. Such slots tear the film layer which holds the individual glass layers together, so that the formation of a compact drill core is prevented.
Nachfolgend werden Ausführungsbeispiele der Erfindung anhand der Figuren der beiliegenden Zeichnung beschrieben.Exemplary embodiments of the invention are described below with reference to the figures in the accompanying drawing.
Die Fig. 1 zeigt eine Seitenansicht eines erfindungsgemäßen Hohlbohrers, die Fig. 2 zeigt eine Draufsicht auf den Schleif¬ ring eines erfindungsgemäßen Hohlbohrers, die Fig. 3 zeigt einen Schnitt durch die Längsmittelachse eines erfindungsgemäßen Hohl- bohrers, die Fig. 4 zeigt ein Schaubild des vorderen Bereiches eines Hohlbohrers gemäß einem weiteren Ausführungsbeispiel und die Fig. 5 zeigt einen Schnitt durch eine Verbundglasplatte.1 shows a side view of a hollow drill according to the invention, FIG. 2 shows a plan view of the slip ring of a hollow drill according to the invention, FIG. 3 shows a section through the longitudinal central axis of a hollow drill according to the invention, FIG. 4 shows a diagram of the front area of a hollow drill according to a further exemplary embodiment and FIG. 5 shows a section through a laminated glass plate.
Der erfindungsgemäße Hohlbohrer weist ein metallisches Träger¬ rohr 1 auf, an dessen vorderen Ende sich der Schneidring 2 be¬ findet. Der Schneidring 2 hat vorzugsweise eine metallische Bin- düng und ist mit Schleifkörn 3, beispielsweise Diamantkörnern, versehen.The hollow drill according to the invention has a metallic carrier tube 1, at the front end of which the cutting ring 2 is located. The cutting ring 2 preferably has a metallic bond and is provided with abrasive grains 3, for example diamond grains.
Im Ausführungsbeispiel befindet sich zwischen dem Trägerrohr 1 und dem Schleifring 2 eine schleif ornfreie Zone 4, die bei- spielsweise von demselben Material gebildet wird, das die Bin¬ dung für den Schleifring bildet.In the exemplary embodiment, there is a grinding-free zone 4 between the carrier tube 1 and the slip ring 2, which zone is formed, for example, from the same material that forms the bond for the slip ring.
Am hinteren Ende ist der Trägerkörper mit einem Gewinde 5 verse¬ hen, mittels dem es in ein Bohrfutter einer Bohrmaschine ein- schraubbar ist. Weiters weist der Hohlbohrer einen Sechskant 6 auf, der den Angriff eines Schraubenschlüssel ermöglicht.At the rear end, the carrier body is provided with a thread 5, by means of which it can be screwed into a drill chuck of a drilling machine. Furthermore, the hollow drill has a hexagon 6, which enables a wrench to be attacked.
Im Ausführungsbeispiel nach der Fig. 4 ist der Schleifring 2 in¬ nen mit Noppen 7 versehen. Die Noppen 7 können in axialer Rich- tung gleichförmig sein oder sich nach hinten verjüngen. Die Nop¬ pen 7 bewirken die Ausbildung eines Bohrkernes 8 in der zu boh¬ renden Glasplatte 9, dessen Durchmesser wesentlich geringer als der Innendurchmesser des Trägerkörpers 1 ist. Dadurch ist der Bohrkern 8 leicht aus dem Trägerkörper entfernbar und unterbin¬ det auch nicht den Durchfluß des Kühlmittels durch das Träger¬ rohr 1.In the exemplary embodiment according to FIG. 4, the slip ring 2 is provided with knobs 7 inside. The knobs 7 can be uniform in the axial direction or taper towards the rear. The knobs 7 effect the formation of a drill core 8 in the glass plate 9 to be drilled, the diameter of which is substantially smaller than the inside diameter of the carrier body 1. This is the Drill core 8 can be easily removed from the carrier body and does not prevent the coolant from flowing through the carrier tube 1.
Im Ausführungsbeispiel nach der Fig. 3 ist der Schleifring 2 in¬ nen konisch ausgeführt, wobei die Innenwand 10 in der Bohrrich¬ tung, d. h. nach vorne konvergiert. Auch mit einem derartigen Hohlbohrer wird ein Bohrkern 8 erzielt, dessen Durchmesser we¬ sentlich geringer als der Innendurchmesser des Trägerkörpers 1 ist.In the exemplary embodiment according to FIG. 3, the slip ring 2 is designed conically, the inner wall 10 in the drilling direction, ie. H. converges forward. A drill core 8 is also achieved with such a hollow drill, the diameter of which is substantially smaller than the inside diameter of the carrier body 1.
Wie aus der Fig. 2 ersichtlich, kann der Schleifring 2 unabhän¬ gig davon, ob er Noppen 7 aufweist oder eine konische Innenwand 10, mit Schlitzen 11 versehen sein, die nicht radial ausgerich- tet sind. Derartige Schlitze 11 zerreißen die zwischen den Glas¬ lagen 12 angeordnete Kunststoff- oder Klebefolie 13 und verhin¬ dern auf diese Art die Bildung eines kompakten Bohrkernes. As can be seen from FIG. 2, the slip ring 2, regardless of whether it has knobs 7 or a conical inner wall 10, can be provided with slots 11 which are not aligned radially. Such slots 11 tear the plastic or adhesive film 13 arranged between the glass layers 12 and in this way prevent the formation of a compact drill core.

Claims

P a t e n t a n s p r ü c h e : Patent claims:
1. Hohlbohrer mit einem vorzugsweise metallischen Trägerrohr mit einem Schneidring der vorzugsweise Diamant als Schleif- körn und ein metallisches Bindemittel aufweist und der ei¬ nen aus dem Werkstück auszuschneidenden Bohrkern definiert, wobei Bereiche an der Innenseite des Schneidringes einen Kreis definieren, dessen Durchmesser kleiner ist als der Innendurchmesser des restlichen Schneidringes, dadurch ge- kennzeichnet, daß der Schneidring (2) innen konisch ist, wobei die Innenwand (10) in der Bohrrichtung konvergiert.1. Hollow drill with a preferably metallic carrier tube with a cutting ring which preferably has diamond as an abrasive grain and a metallic binder and which defines a drill core to be cut out of the workpiece, areas on the inside of the cutting ring defining a circle whose diameter is smaller than the inner diameter of the remaining cutting ring, characterized in that the cutting ring (2) is conical on the inside, the inner wall (10) converging in the drilling direction.
2. Hohlbohrer nach Anspruch 1, dadurch gekennzeichnet, daß die Innenwand (10) des Schleifringes (2) unrund, vorzugsweise elliptisch ist.2. Hollow drill according to claim 1, characterized in that the inner wall (10) of the slip ring (2) is out of round, preferably elliptical.
3. Hohlbohrer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Schleifring (2) von mindestens einem quer zur Bohr¬ richtung verlaufenden Schlitz (11) durchbrochen wird, der außermittig verläuft.3. Hollow drill according to claim 1 or 2, characterized in that the slip ring (2) is pierced by at least one slot (11) extending transversely to the drilling direction and running off-center.
4. Hohlbohrer mit einem vorzugsweise metallischen Trägerrohr mit einem Schneidring der vorzugsweise Diamant als Schleif¬ korn und ein metallisches Bindemittel aufweist und der ei- nen aus dem Werkstück auszuschneidenden Bohrkern definiert, wobei Bereiche an der Innenseite des Schneidringes einen Kreis definieren, dessen Durchmesser kleiner ist als der Innendurchmesser des restlichen Schneidringes, dadurch ge¬ kennzeichnet, daß der Schneidring (2) außen einen durchge- henden Kreis beschreibt und an der Innenseite Noppen (7) od.dgl. aufweist, die den Durchmesser des Bohrkernes (8) definieren. 4. Hollow drill with a preferably metallic carrier tube with a cutting ring which preferably has diamond as an abrasive grain and a metallic binder and which defines a drill core to be cut out of the workpiece, areas on the inside of the cutting ring defining a circle whose diameter is smaller than the inside diameter of the rest of the cutting ring, characterized in that the cutting ring (2) describes a continuous circle on the outside and knobs (7) or the like on the inside. has, which define the diameter of the drill core (8).
PCT/AT1991/000136 1991-01-15 1991-12-19 Hollow drill WO1992012837A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA64/91 1991-01-15
AT6491 1991-01-15

Publications (1)

Publication Number Publication Date
WO1992012837A1 true WO1992012837A1 (en) 1992-08-06

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Application Number Title Priority Date Filing Date
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2734908A1 (en) * 1995-06-02 1996-12-06 Christian Hubert Hache Verifying absence of voltage on part of insulated industrial electric cable having metal jacket
EP1562726A2 (en) * 2002-08-31 2005-08-17 Richard Capstran Hole saw having efficient slug removal backround of the invention
EP2818288A1 (en) * 2013-06-25 2014-12-31 Schott AG Tool crown and glass or glass ceramic product which can be produced with the tool crown
EP4163071A1 (en) * 2021-10-11 2023-04-12 Hilti Aktiengesellschaft Annular drill bit with improved drill core removal

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US3173314A (en) * 1961-02-15 1965-03-16 Norton Co Method of making core drills
US3243924A (en) * 1964-01-06 1966-04-05 Wheel Trueing Tool Co Diamond drill bit
US3306380A (en) * 1964-01-27 1967-02-28 Gen Automation Mfg Inc Core drill
US3494348A (en) * 1967-02-20 1970-02-10 Trw Inc Core drill
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GB1499992A (en) * 1975-07-08 1978-02-01 Marconi Co Ltd Drill bits
JPS62157779A (en) * 1986-01-06 1987-07-13 Toshiba Corp Grindstone
WO1990015683A1 (en) * 1989-06-14 1990-12-27 Tyrolit Schleifmittelwerke Swarovski K.G. Hollow drill

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Publication number Priority date Publication date Assignee Title
US3173314A (en) * 1961-02-15 1965-03-16 Norton Co Method of making core drills
US3243924A (en) * 1964-01-06 1966-04-05 Wheel Trueing Tool Co Diamond drill bit
US3306380A (en) * 1964-01-27 1967-02-28 Gen Automation Mfg Inc Core drill
US3494348A (en) * 1967-02-20 1970-02-10 Trw Inc Core drill
DE2031094A1 (en) * 1970-06-24 1972-01-13 Ukramskv Nautschno Issledowatelsky konstruktorskotekhnologichesky Institut sinteticheskikh swerkhtwerdykh materialow i instrumenta, Kiew (Sowjetunion) Diamond hollow drill
GB1499992A (en) * 1975-07-08 1978-02-01 Marconi Co Ltd Drill bits
JPS62157779A (en) * 1986-01-06 1987-07-13 Toshiba Corp Grindstone
WO1990015683A1 (en) * 1989-06-14 1990-12-27 Tyrolit Schleifmittelwerke Swarovski K.G. Hollow drill

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PATENT ABSTRACTS OF JAPAN vol. 11, no. 392 (M-653)(2839) 22. Dezember 1987 & JP,62 157 779 ( TOSHIBA CORP ) 13. Juli 1987 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2734908A1 (en) * 1995-06-02 1996-12-06 Christian Hubert Hache Verifying absence of voltage on part of insulated industrial electric cable having metal jacket
EP1562726A2 (en) * 2002-08-31 2005-08-17 Richard Capstran Hole saw having efficient slug removal backround of the invention
EP1562726A4 (en) * 2002-08-31 2006-01-04 Richard Capstran Hole saw having efficient slug removal backround of the invention
EP2818288A1 (en) * 2013-06-25 2014-12-31 Schott AG Tool crown and glass or glass ceramic product which can be produced with the tool crown
RU2661683C2 (en) * 2013-06-25 2018-07-19 Шотт Аг Tool crown and glass-ceramic article made using tool crown
US10926431B2 (en) 2013-06-25 2021-02-23 Schott Ag Tool head and glass or glass ceramic article producible using the tool head
EP4163071A1 (en) * 2021-10-11 2023-04-12 Hilti Aktiengesellschaft Annular drill bit with improved drill core removal
WO2023061751A1 (en) * 2021-10-11 2023-04-20 Hilti Aktiengesellschaft Annular core drill bit with improved core removal

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