EP0653544A2 - Twist drill - Google Patents

Twist drill Download PDF

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Publication number
EP0653544A2
EP0653544A2 EP94810518A EP94810518A EP0653544A2 EP 0653544 A2 EP0653544 A2 EP 0653544A2 EP 94810518 A EP94810518 A EP 94810518A EP 94810518 A EP94810518 A EP 94810518A EP 0653544 A2 EP0653544 A2 EP 0653544A2
Authority
EP
European Patent Office
Prior art keywords
grooves
shank
rock drill
width
groove
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
EP94810518A
Other languages
German (de)
French (fr)
Other versions
EP0653544B1 (en
EP0653544A3 (en
Inventor
Axel Neukirchen
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 EP0653544A2 publication Critical patent/EP0653544A2/en
Publication of EP0653544A3 publication Critical patent/EP0653544A3/en
Application granted granted Critical
Publication of EP0653544B1 publication Critical patent/EP0653544B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • E21B10/445—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts percussion type, e.g. for masonry
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/22—Rods or pipes with helical structure
    • 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
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
    • Y10T408/9097—Spiral channel

Definitions

  • the invention relates to a rock drill with a drill head, a shank and an insertion end opposite the drill head, the shank having at least one helical conveying spiral and the back of the conveying spiral forming the outside diameter being penetrated by grooves.
  • the spiral-shaped conveying coils on the shank of known rock drills guide the drilling material removed during the drilling process - analogous to a screw conveyor - from the deepest of the borehole.
  • these rock drills are operated in ever smaller drilling rigs that are more powerful in terms of impact energy.
  • the need for turning power, which results, among other things, from the friction between the back of the production helix and the borehole wall, has remained essentially constant, since a reduction in the total back width of the production helix would have a disadvantageous effect on the routing of the rock drill underground.
  • a rock drill is known, the shaft of which has a conveying helix, the back of which has grooves arranged in the circumferential direction at intervals which are inclined with respect to the longitudinal axis of the drill.
  • a reduction in the back surface interacting with the borehole wall can be seen in the broadest sense of this known rock drill.
  • a performance gain which is achieved by less friction of the back against the borehole wall due to a smaller back surface, is destroyed again by the projecting parts of the groove-like profile hanging on the partly rough surface of the borehole wall and thus overall the friction of the rock drill in this way increase.
  • the invention has for its object to provide a rock drill, the helix ensures good guidance of the rock drill in a borehole during the machining process and at the same time generates less friction on the borehole wall.
  • the width of the back of the conveyor helix is constant over the entire length of the conveyor helix.
  • the grooves arranged on the back of this conveyor helix are preferably arranged in such a way that the grooves are arranged one behind the other at equal intervals along the central axis of the shaft.
  • the width of the grooves is therefore also dependent on the outer diameter of the shaft.
  • the ratio between the width of the groove and the diameter of the shank is expediently 0.05: 1 to 0.3: 1.
  • the grooves are in particular only designed such that the bottom of the groove is set back slightly in the radial direction with respect to the back of the conveyor helix.
  • the depth of the groove must be such that the majority of the particles of the drilling material are larger than the depth of the groove. Since the particle size of the drilling material is in turn dependent on the diameter of the rock drill, the depth of the groove is in a specific ratio to the outside diameter of the shank, this ratio preferably being 0.02: 1 to 0.05: 1.
  • the width of the groove can be designed differently with respect to the width of the back of the conveyor spiral.
  • the grooves on the back of the production helix are made wider, so that less back surface of the production helix can come into contact with the borehole wall . Machining hard materials requires grooves with a smaller width.
  • the ratio between the width of the grooves and the width of the back of the conveyor spiral is expediently 0.8: 1 to 6: 1.
  • the rock drill shown in FIGS. 1 and 2 has a drill head 1, a shank 2 and an insertion end 3 opposite the drill head 1.
  • the shank 2 has, for example, two helical conveying spirals 4, 5, the backs 6, 7 forming the outer diameter the feed coils 4, 5 are penetrated by grooves 8, 9.
  • the grooves 8, 9 run in planes that extend at right angles to the longitudinal axis of the rock drill and are axially offset from one another.
  • a soldered hard metal plate 10 In the end area of the drill head 2 there is a soldered hard metal plate 10, the outer contour of which slightly exceeds the outer diameter of the shank 2.
  • the grooves 8, 9 are arranged one behind the other at equal intervals A along the central axis of the shaft 2.
  • the width B of the grooves 8, 9 is dependent on the width R of the back 6, 7 of the conveyor helix 4, 5.
  • the depth T of the grooves 8, 9 is dependent on the outer diameter D of the shaft 2.

Abstract

The rock drill has a drill head (1), a body (2) and a shank (3) opposite the drill head (1). The body (2) has at least one conveying helix (4, 5) which is penetrated by grooves (8, 9) on its back (6, 7) forming the outside diameter. The grooves (8, 9) run along planes arranged at right angles to the centre axis of the body (2). <IMAGE>

Description

Die Erfindung betrifft einen Gesteinsbohrer mit einem Bohrkopf, einem Schaft und einem dem Bohrkopf gegenüberliegenden Einsteckende, wobei der Schaft wenigstens eine wendelartig verlaufende Förderwendel aufweist und der den Aussendurchmesser bildende Rücken der Förderwendel von Nuten durchsetzt ist.The invention relates to a rock drill with a drill head, a shank and an insertion end opposite the drill head, the shank having at least one helical conveying spiral and the back of the conveying spiral forming the outside diameter being penetrated by grooves.

Die wendelartig verlaufende Förderwendeln am Schaft bekannter Gesteinsbohrer, leiten beim Bohrvorgang abgetragenes Bohrgut - analog einer Förderschnecke - aus dem Bohrlochtiefsten nach aussen. Diese Gesteinsbohrer werden heute in immer kleineren, von der Schlagenergie her leistungsfähigeren Bohrgeräten betrieben. Der Bedarf an Drehleistung, der sich unter anderem aus der Reibung zwischen dem Rücken der Förderwendel und der Bohrlochwand ergibt, ist im wesentlichen konstant geblieben, da eine Reduzierung der gesamten Rückenbreite der Förderwendel sich nachteilig auf die Führung des Gesteinsbohrers im Untergrund auswirken würde.The spiral-shaped conveying coils on the shank of known rock drills guide the drilling material removed during the drilling process - analogous to a screw conveyor - from the deepest of the borehole. Today, these rock drills are operated in ever smaller drilling rigs that are more powerful in terms of impact energy. The need for turning power, which results, among other things, from the friction between the back of the production helix and the borehole wall, has remained essentially constant, since a reduction in the total back width of the production helix would have a disadvantageous effect on the routing of the rock drill underground.

Aus der DE-AS 20 13 327 ist ein Gesteinsbohrer bekannt, dessen Schaft eine Förderwendel aufweist, deren Rücken in Umfangsrichtung in Abständen angeordnete Rillen aufweist, die gegenüber der Bohrerlängsachse geneigt sind.From DE-AS 20 13 327 a rock drill is known, the shaft of which has a conveying helix, the back of which has grooves arranged in the circumferential direction at intervals which are inclined with respect to the longitudinal axis of the drill.

Diesem bekannten Gesteinsbohrer ist im weitesten Sinne eine Reduzierung der mit der Bohrlochwandung zusammenwirkenden Rückenfläche entnehmbar. Ein Leistungsgewinn, der erzielt wird durch weniger Reibung des Rückens an der Bohrlochwandung aufgrund einer kleineren Rückenfläche, wird dadurch wieder vernichtet, indem die vorstehenden Teile der rillenartigen Profilierung an der zum Teil rauhen Oberfläche der Bohrlochwandung einhängen und damit insgesamt die Reibung des Gesteinsbohrers auf diese Art erhöhen.A reduction in the back surface interacting with the borehole wall can be seen in the broadest sense of this known rock drill. A performance gain, which is achieved by less friction of the back against the borehole wall due to a smaller back surface, is destroyed again by the projecting parts of the groove-like profile hanging on the partly rough surface of the borehole wall and thus overall the friction of the rock drill in this way increase.

Der Erfindung liegt die Aufgabe zugrunde, einen Gesteinsbohrer zu schaffen, dessen Förderwendel eine gute Führung des Gesteinsbohrers in einem Bohrloch während des Bearbeitungsvorganges gewährleistet und gleichzeitig eine geringere Reibung an der Bohrlochwandung erzeugt.The invention has for its object to provide a rock drill, the helix ensures good guidance of the rock drill in a borehole during the machining process and at the same time generates less friction on the borehole wall.

Erfindungsgemäss wird dies dadurch erreicht, dass die Nuten entlang rechtwinklig zur Mittelachse des Schaftes angeordneten Ebenen verlaufen.This is achieved according to the invention in that the grooves run along planes arranged at right angles to the central axis of the shaft.

Aufgrund der rechtwinkligen Anordnung der am Rücken der Förderwendel angeordneten Nuten bleibt die gesamte Breite des Rückens erhalten. Dieser wird lediglich durchsetzt von mehreren in axialer Richtung voneinander beabstandeten Nuten, so dass nicht mehr die gesamte Rückenfläche mit der Bohrlochwandung während eines Bohrvorganges zusammenwirkt. Aufgrund der erfindungsgemässen Ausgestaltung ergeben sich keine vorstehenden Teile der Nut, die mit einer rauhen Oberfläche einer Bohrlochwandung derart zusammenwirken, dass eine gewonnene Leistungreduzierung vernichtet wird.Due to the right-angled arrangement of the grooves arranged on the back of the conveyor helix, the entire width of the back is retained. This is only penetrated by a plurality of grooves spaced apart from one another in the axial direction, so that the entire back surface no longer interacts with the borehole wall during a drilling operation. Because of the configuration according to the invention, there are no protruding parts of the groove which cooperate with a rough surface of a borehole wall in such a way that a reduction in output is destroyed.

Aus herstellungstechnischen und wirtschaftlichen Gründen ist die Breite des Rückens der Förderwendel über die gesamte Länge der Förderwendel konstant ausgebildet. Die am Rücken dieser Förderwendel angeordneten Nuten sind vorzugsweise derart ange ordnet, dass die Nuten in gleichen Abständen entlang der Mittelachse des Schaftes hintereinander angeordnet sind.For manufacturing and economic reasons, the width of the back of the conveyor helix is constant over the entire length of the conveyor helix. The grooves arranged on the back of this conveyor helix are preferably arranged in such a way that the grooves are arranged one behind the other at equal intervals along the central axis of the shaft.

Vom Durchmesser des Schaftes hängt es ab, wie gross die Reibung ist, die während eines Bohrvorganges entsteht. Ein Gesteinsbohrer mit einem grösseren Durchmesser hat einen grösseren Umfang und deshalb auch Förderwendeln mit grösserer Rückenfläche. Die Breite der Nuten ist deshalb ebenfalls abhängig vom Aussendurchmesser des Schaftes. Das Verhältnis zwischen der Breite der Nut und dem Durchmesser des Schaftes beträgt dabei zweckmässigerweise 0,05:1 bis 0,3:1.It depends on the diameter of the shaft how big the friction is, which arises during a drilling process. A rock drill with a larger diameter has a larger circumference and therefore also feed coils with a larger back surface. The width of the grooves is therefore also dependent on the outer diameter of the shaft. The ratio between the width of the groove and the diameter of the shank is expediently 0.05: 1 to 0.3: 1.

Um die von den wendelartig ausgebildeten Förderwendeln erzeugte Abfuhrleistung des Bohrkleines nicht negativ zu beeinflussen, sind die Nuten insbesondere nur derart rief ausgebildet, dass der Nutengrund in radialer Richtung bezüglich des Rückens der Förderwendel geringfügig zurückversetzt ist. Die Tiefe der Nut muss auf jeden Fall derart ausgebildet sein, dass die Mehrheit der Teilchen des Bohrgutes grösser ist, als die Tiefe der Nut. Da die Teilchengrösse des Bohrguts wiederum abhängig ist von dem Durchmesser des Gesteinsbohrers, steht die Tiefe der Nut in einem bestimmten Verhältnis zum Aussendurchmesser des Schaftes, wobei dieses Verhältnis vorzugsweise 0,02:1 bis 0,05:1 beträgt.In order not to adversely affect the discharge performance of the cuttings produced by the helical conveyor screws, the grooves are in particular only designed such that the bottom of the groove is set back slightly in the radial direction with respect to the back of the conveyor helix. In any case, the depth of the groove must be such that the majority of the particles of the drilling material are larger than the depth of the groove. Since the particle size of the drilling material is in turn dependent on the diameter of the rock drill, the depth of the groove is in a specific ratio to the outside diameter of the shank, this ratio preferably being 0.02: 1 to 0.05: 1.

Abhängig von dem zu bearbeitenden Untergrund kann die Breite der Nut bezogen auf die Breite des Rückens der Förderwendel unterschiedlich ausgebildet sein. Bei der Bearbeitung von Materialien, bei denen eine hohe Reibung zwischen dem Rücken der Förderwendel und der Bohrlochwandung auftritt, ist es zweckmässig, wenn die Nuten auf dem Rücken der Förderwendel breiter ausgebildet sind, so dass weniger Rückenfläche der Förderwendel mit der Bohrlochwandung in Kontakt gelangen kann. Die Bearbeitung harter Werkstoffe erfordert Nuten mit geringerer Breite. Zweckmässigerweise beträgt das Verhältnis zwischen der Breite der Nuten und der Breite des Rückens der Förderwendel 0,8:1 bis 6:1.Depending on the substrate to be processed, the width of the groove can be designed differently with respect to the width of the back of the conveyor spiral. When processing materials in which there is a high level of friction between the back of the production helix and the borehole wall, it is expedient if the grooves on the back of the production helix are made wider, so that less back surface of the production helix can come into contact with the borehole wall . Machining hard materials requires grooves with a smaller width. The ratio between the width of the grooves and the width of the back of the conveyor spiral is expediently 0.8: 1 to 6: 1.

Die Erfindung wird anhand von Zeichnungen, die ein Ausführungsbeispiel wiedergeben, näher erläutert. Es zeigen:

Fig. 1
einen erfindungsgemässen Gesteinsbohrer in vereinfachter Darstellung;
Fig. 2
eine Seitenansicht des vorderen Bereiches des Gesteinsbohrers gemäss Fig. 1 in vergrösserter Darstellung.
The invention is explained in more detail with reference to drawings which show an exemplary embodiment. Show it:
Fig. 1
a rock drill according to the invention in a simplified representation;
Fig. 2
a side view of the front area of the rock drill according to FIG. 1 in an enlarged view.

Der in den Fig. 1 und 2 dargestellte Gesteinsbohrer besitzt einen Bohrkopf 1, einen Schaft 2 und ein dem Bohrkopf 1 gegenüberliegendes Einsteckende 3. Der Schaft 2 weist beispielsweise zwei wendelartig verlaufende Förderwendeln 4, 5 auf, wobei die den Aussendurchmesser bildenden Rücken 6, 7 der Förderwendeln 4, 5 von Nuten 8, 9 durchsetzt sind. Die Nuten 8, 9 verlaufen in Ebenen, die sich rechtwinklig zur Längsachse des Gesteinsbohrers erstrecken und axial zueinander versetzt sind. Im stimseitigen Bereich des Bohrkopfes 2 befindet sich eine eingelötete Hartmetallplatte 10, deren Aussenkontur den Aussendurchmesser des Schaftes 2 geringfügig überragt.The rock drill shown in FIGS. 1 and 2 has a drill head 1, a shank 2 and an insertion end 3 opposite the drill head 1. The shank 2 has, for example, two helical conveying spirals 4, 5, the backs 6, 7 forming the outer diameter the feed coils 4, 5 are penetrated by grooves 8, 9. The grooves 8, 9 run in planes that extend at right angles to the longitudinal axis of the rock drill and are axially offset from one another. In the end area of the drill head 2 there is a soldered hard metal plate 10, the outer contour of which slightly exceeds the outer diameter of the shank 2.

Die Fig. 2 zeigt eine vergrösserte Darstellung der auf dem Rücken 6, 7 der Förderwendel 4, 5 angeordneten Nuten 8, 9. Die Nuten 8, 9 sind in gleichen Abständen A entlang der Mittelachse des Schaftes 2 hintereinander angeordnet. Die Breite B der Nuten 8, 9 ist abhängig von der Breite R des Rückens 6, 7 der Förderwendel 4, 5. Die Tiefe T der Nuten 8, 9 ist abhängig vom Aussendurchmesser D des Schaftes 2.2 shows an enlarged illustration of the grooves 8, 9 arranged on the back 6, 7 of the conveyor helix 4, 5. The grooves 8, 9 are arranged one behind the other at equal intervals A along the central axis of the shaft 2. The width B of the grooves 8, 9 is dependent on the width R of the back 6, 7 of the conveyor helix 4, 5. The depth T of the grooves 8, 9 is dependent on the outer diameter D of the shaft 2.

Claims (5)

Gesteinsbohrer mit einem Bohrkopf (1), einem Schaft (2) und einem dem Bohrkopf (1) gegenüberliegenden Einsteckende (3), wobei der Schaft (2) wenigstens eine wendelartig verlaufende Förderwendel (4, 5) aufweist, und der den Aussendurchmesser bildende Rücken (6, 7) der Förderwendel (4, 5) von Nuten (8, 9) durchsetzt ist, dadurch gekennzeichnet, dass die Nuten entlang rechtwinklig zur Mittelachse des Schaftes (2) angeordneten Ebenen verlaufen.Rock drill with a drill head (1), a shank (2) and an insertion end (3) opposite the drill head (1), the shank (2) having at least one helical conveying helix (4, 5) and the back forming the outside diameter (6, 7) the feed spiral (4, 5) is penetrated by grooves (8, 9), characterized in that the grooves run along planes arranged at right angles to the central axis of the shaft (2). Gesteinsbohrer nach Anspruch 1, dadurch gekennzeichnet, dass die Nuten (5, 8) in gleichen Abständen entlang der Mittelachse des Schaftes (2) hintereinander ange ordnet sind.Rock drill according to claim 1, characterized in that the grooves (5, 8) are arranged one behind the other at equal intervals along the central axis of the shank (2). Gesteinsbohrer nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Verhältnis zwischen der Breite der Nut (B) und dem Aussendurchmesser (D) des Schaftes (2) 0,05:1 bis 0,3:1 beträgt.Rock drill according to claim 1 or 2, characterized in that the ratio between the width of the groove (B) and the outer diameter (D) of the shank (2) is 0.05: 1 to 0.3: 1. Gesteinsbohrer nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Verhältnis zwischen der Tiefe (T) der Nut (8, 9) und dem Aussendurchmesser (D) des Schaftes (2) 0,02:1 bis 0,05:1 beträgt.Rock drill according to one of claims 1 to 3, characterized in that the ratio between the depth (T) of the groove (8, 9) and the outer diameter (D) of the shank (2) 0.02: 1 to 0.05: 1 is. Gesteinsbohrer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Verhältnis zwischen der Breite (B) der Nut (8, 9) und der Breite (R) des Rückens (6, 7) der Förderwendel (4, 5) 0,8:1 bis 6:1 beträgt.Rock drill according to one of claims 1 to 4, characterized in that the ratio between the width (B) of the groove (8, 9) and the width (R) of the back (6, 7) of the conveyor helix (4, 5) 0, 8: 1 to 6: 1.
EP94810518A 1993-11-11 1994-09-07 Twist drill Expired - Lifetime EP0653544B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4338490 1993-11-11
DE4338490A DE4338490A1 (en) 1993-11-11 1993-11-11 Twist drill

Publications (3)

Publication Number Publication Date
EP0653544A2 true EP0653544A2 (en) 1995-05-17
EP0653544A3 EP0653544A3 (en) 1995-11-02
EP0653544B1 EP0653544B1 (en) 1998-06-17

Family

ID=6502330

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94810518A Expired - Lifetime EP0653544B1 (en) 1993-11-11 1994-09-07 Twist drill

Country Status (6)

Country Link
US (1) US5503237A (en)
EP (1) EP0653544B1 (en)
JP (1) JPH07180464A (en)
CN (1) CN1038702C (en)
DE (2) DE4338490A1 (en)
DK (1) DK0653544T3 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2116321A1 (en) * 2008-05-09 2009-11-11 Irwin Industrial Tools GmbH Boring tool, in particular twist drill
DE102008022945A1 (en) * 2008-05-09 2009-12-03 Irwin Industrial Tools Gmbh Drilling tool, in particular twist drills
WO2011139960A1 (en) * 2010-05-04 2011-11-10 Illinois Tool Works Inc. Drill bit, device for producing and method for producing a drill bit

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DE19648868A1 (en) * 1996-11-26 1998-05-28 Hilti Ag Drilling tool with a hollow cylindrical support body
DE29723908U1 (en) * 1997-12-04 1999-05-27 Hawera Probst Gmbh Rock drilling tool
DE10015203A1 (en) 2000-03-27 2001-10-04 Hilti Ag Twist drill
DE10053343B4 (en) * 2000-10-27 2009-04-16 Hilti Aktiengesellschaft twist drill
DE10142560A1 (en) * 2001-08-30 2003-03-20 Hilti Ag Drilling head with a cutting element
DE102009033942A1 (en) * 2009-07-14 2011-01-20 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG drill
DE102009038516A1 (en) * 2009-08-25 2011-03-03 Illinois Tool Works Inc., Glenview rock drill
DE102012112781A1 (en) * 2012-12-20 2014-06-26 Walter Ag twist drill
US11007583B2 (en) * 2016-02-14 2021-05-18 Hongjia Wang Twist drill
EP3639956A4 (en) * 2017-06-13 2021-03-17 Sumitomo Electric Hardmetal Corp. Drill

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US1740761A (en) * 1926-06-21 1929-12-24 Berry Francois Jacq Barthelemy Machine for rock or coal cutting
DE803291C (en) * 1949-01-26 1951-04-02 Victor Products Ltd Coal and rock rotary drills with auger

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2116321A1 (en) * 2008-05-09 2009-11-11 Irwin Industrial Tools GmbH Boring tool, in particular twist drill
DE102008022945A1 (en) * 2008-05-09 2009-12-03 Irwin Industrial Tools Gmbh Drilling tool, in particular twist drills
WO2011139960A1 (en) * 2010-05-04 2011-11-10 Illinois Tool Works Inc. Drill bit, device for producing and method for producing a drill bit

Also Published As

Publication number Publication date
EP0653544B1 (en) 1998-06-17
CN1038702C (en) 1998-06-10
CN1107928A (en) 1995-09-06
EP0653544A3 (en) 1995-11-02
DE4338490A1 (en) 1995-05-18
JPH07180464A (en) 1995-07-18
US5503237A (en) 1996-04-02
DK0653544T3 (en) 1999-04-06
DE59406265D1 (en) 1998-07-23

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