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EP0452255A2 - Stone drill bit - Google Patents

Stone drill bit Download PDF

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Publication number
EP0452255A2
EP0452255A2 EP91810185A EP91810185A EP0452255A2 EP 0452255 A2 EP0452255 A2 EP 0452255A2 EP 91810185 A EP91810185 A EP 91810185A EP 91810185 A EP91810185 A EP 91810185A EP 0452255 A2 EP0452255 A2 EP 0452255A2
Authority
EP
European Patent Office
Prior art keywords
cutting
pins
rock drill
diameter
cutting pins
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
EP91810185A
Other languages
German (de)
French (fr)
Other versions
EP0452255A3 (en
EP0452255B1 (en
Inventor
Gerhard Rumpp
Josef Obermeier
Josef FÀ¼nfer
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 EP0452255A2 publication Critical patent/EP0452255A2/en
Publication of EP0452255A3 publication Critical patent/EP0452255A3/en
Application granted granted Critical
Publication of EP0452255B1 publication Critical patent/EP0452255B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/56—Button-type inserts
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/58—Chisel-type inserts

Definitions

  • the invention relates to a rock drill with a shank and a drill head, which on its end face pointing in the direction of advance has an insert that extends at least over the diameter and at least two cutting pins.
  • Rock drills are used to make holes in rock, concrete, masonry and the like, which are used to hold fasteners, pass through pipes and cables and to blow up.
  • Rock drills which represent a combination of cutting insert and cutting pins, have the advantage that the drilling material removed from the cutting insert is further reduced by the cutting pins.
  • Such rock drills are known for example from DE-OS 35 44 433.
  • the invention has for its object to provide a rock drill that ensures additional crushing of the drilling material with high mining performance and enables increased removal of the cuttings.
  • this is achieved in that the cutting pins lie on a diameter which forms an angle deviating from 90 ° with the diameter of the cutting plate.
  • the arrangement of the cutting pins according to the invention results in an enlargement of discharge grooves.
  • the cutting pins are advantageously arranged on the diameter on both sides of the cutting plate. This opens up the possibility of a symmetrical arrangement.
  • the arrangement of two cutting pins, in particular in the edge zone of the drill head, permits additional centering of the rock drill during the drilling process.
  • the cutting pins are advantageously arranged rotationally symmetrically to the longitudinal axis of the shaft. This ensures an increased smoothness of the rock drill and compliance with an exact drilling geometry.
  • the acute angle enclosed between the two diameters is advantageously between 40 ° and 70 °. Such an angle has proven particularly useful because, in the area of the complementary obtuse angle, the arrangement of sufficiently large discharge grooves on the end face is particularly favored.
  • a helix is regularly connected to the discharge grooves, which determines the direction of rotation of the rock drill.
  • the acute angle which is formed by the diameter of the cutting plate and the diameter on which the cutting pins lie is preferably arranged on the side of the cutting plate facing away from the direction of rotation.
  • the free ends of the cutting pins preferably do not lie in the rotational surface formed by the cutting edges of the cutting plate, but are set back slightly, for example 0.3 mm to 1.5 mm in the drilling direction.
  • the feed rate during the drilling process is thereby more evenly, since the cutting pins come into contact with the surface at almost the same time as the cutting plate. This means that the subsoil is dismantled more evenly.
  • the cutting pins support the drill head in the feed direction.
  • the rock drill shown in FIGS. 1 to 3 essentially consists of a shaft 1 and a drill head 2 connected to it.
  • the shaft 1 is provided with a conveying helix 9, which on the one hand serves to guide the drill in the borehole and on the other hand to remove the cuttings.
  • the drill head 2 is provided with discharge grooves 6, 10 which run in the longitudinal direction and which serve for the passage of the cuttings from the end face 3 of the drill head 2 pointing in the feed direction to the shank 1.
  • the drill head 2 is provided with a centrally arranged cutting plate 4.
  • the cutting plate 4 projects beyond the drilling head 2 both in the radial direction and in the feed direction.
  • cutting pins 5 are arranged, which lie on a diameter that includes an acute angle a with the diameter of the cutting plate 4. This acute angle a is - as shown in FIG. 3 - arranged on the side of the cutting plate 4 facing away from the direction of rotation D.
  • the section shown in Fig. 3 clearly shows the arrangement of the cutting pins 5 in an inclined direction to the longitudinal axis of the shaft.
  • the cutting pins 5 are inserted so deeply into the drilling head 2 that the free end faces of the cutting pins 5 lie below the rotational surface formed by cutting edges 7, 8 of the cutting plate 4.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Walking Sticks, Umbrellas, And Fans (AREA)

Abstract

Der aus Schaft (1) und Bohrkopf (2) bestehende Gesteinsbohrer ist an der in Vorschubrichtung weisenden Stirnseite (3) des Bohrkopfes (2) mit einer Schneidplatte (4) sowie Schneidstiften (5) versehen. Der Durchmesser auf dem die Schneidplatte (4) und der Durchmesser auf dem die Schneidstifte (5) angeordnet sind, bilden einen, von 90° abweichenden, Winkel. Durch die Abweichung des Winkels beider Durchmesser wird eine Vergrösserung von Abfuhrnuten (6) ermöglicht. <IMAGE>The rock drill consisting of shank (1) and drill head (2) is provided with a cutting plate (4) and cutting pins (5) on the front side (3) of the drilling head (2) pointing in the direction of feed. The diameter on which the cutting plate (4) and the diameter on which the cutting pins (5) are arranged form an angle deviating from 90 °. The deviation of the angle of both diameters enables the removal grooves (6) to be enlarged. <IMAGE>

Description

Die Erfindung betrifft einen Gesteinsbohrer mit Schaft und einem Bohrkopf, der auf seiner in Vorschubrichtung weisenden Stirnseite eine zumindest über den Durchmesser sich erstreckende Schneidplatte und mindestens zwei Schneidstifte aufweist.The invention relates to a rock drill with a shank and a drill head, which on its end face pointing in the direction of advance has an insert that extends at least over the diameter and at least two cutting pins.

Gesteinsbohrer werden zur Herstellung von Bohrungen in Fels, Beton, Mauerwerk und dergleichen eingesetzt, welche der Aufnahme von Befestigungselementen, dem Durchführen von Rohren und Kabeln sowie zum Sprengen dienen. Gesteinsbohrer, die eine Kombination von Schneidplatte und Schneidstiften darstellen, haben den Vorteil, dass durch die Schneidstifte das von der Schneidplatte abgetragene Bohrgut weiter zerkleinert wird. Solche Gesteinsbohrer sind zB aus der DE-OS 35 44 433 bekannt.Rock drills are used to make holes in rock, concrete, masonry and the like, which are used to hold fasteners, pass through pipes and cables and to blow up. Rock drills, which represent a combination of cutting insert and cutting pins, have the advantage that the drilling material removed from the cutting insert is further reduced by the cutting pins. Such rock drills are known for example from DE-OS 35 44 433.

Unter mannigfaltigen Arbeitsbedingungen stellt die Leistungsfähigkeit dieser bekannten Gesteinsbohrer zufrieden. Bei gewissen Einsatzverhältnissen ist jedoch die Abfuhr des Bohrkleins und der Bohrfortschritt nicht optimal.The performance of these well-known rock drills is satisfactory under diverse working conditions. In certain operating conditions, however, the removal of the cuttings and the drilling progress is not optimal.

Der Erfindung liegt die Aufgabe zugrunde, einen Gesteinsbohrer zu schaffen, der bei hoher Abbauleistung eine zusätzliche Zerkleinerung des Bohrgutes gewährleistet und eine erhöhte Abfuhr des Bohrkleins ermöglicht.The invention has for its object to provide a rock drill that ensures additional crushing of the drilling material with high mining performance and enables increased removal of the cuttings.

Gemäss der Erfindung wird dies dadurch erreicht, dass die Schneidstifte auf einem Durchmesser liegen, der mit dem Durchmesser der Schneidplatte einen von 90° abweichenden Winkel bildet.According to the invention, this is achieved in that the cutting pins lie on a diameter which forms an angle deviating from 90 ° with the diameter of the cutting plate.

Durch die erfindungsgemässe Anordnung der Schneidstifte ergibt sich eine Vergrösserung von Abfuhrnuten.The arrangement of the cutting pins according to the invention results in an enlargement of discharge grooves.

Vorteilhafterweise sind die Schneidstifte auf dem Durchmesser beidseits der Schneidplatte angeordnet. Dies öffnet die Möglichkeit einer symmetrischen Anordnung.The cutting pins are advantageously arranged on the diameter on both sides of the cutting plate. This opens up the possibility of a symmetrical arrangement.

Dies gilt besonders für den Fall, dass die Anzahl der Schneidstifte auf beiden Seiten gleich ist. Durch die zahlenmässige Gleichheit der Schneidstifte auf beiden Seiten erreicht man eine gleichmässigere Zerkleinerung des Bohrgutes und einen ruhigeren Lauf des Gesteinsbohrers.This is especially true if the number of cutting pins is the same on both sides. Due to the numerical equality of the cutting pins on both sides, a more uniform size reduction of the drilling material and a smoother running of the rock drill are achieved.

Die Anordnung zweier Schneidstifte, insbesondere in der Randzone des Bohrkopfes, lässt eine zusätzliche Zentrierung des Gesteinsbohrers während des Bohrvorganges zu.The arrangement of two cutting pins, in particular in the edge zone of the drill head, permits additional centering of the rock drill during the drilling process.

Vorteilhafterweise sind die Schneidstifte rotationssymmetrisch zur Schaftlängsachse angeordnet. Damit wird eine erhöhte Laufruhe des Gesteinsbohrers und die Einhaltung einer genauen Bohrgeometrie gewährleistet.The cutting pins are advantageously arranged rotationally symmetrically to the longitudinal axis of the shaft. This ensures an increased smoothness of the rock drill and compliance with an exact drilling geometry.

Der zwischen den beiden Durchmessern eingeschlossene spitze Winkel liegt vorteilhafterweise zwischen 40° und 70°. Ein solcher Winkel hat sich deshalb besonders bewährt, weil im Bereich des komplementären stumpfen Winkels die Anordnung von ausreichend grosser Abfuhrnuten an der Stirnseite besonders begünstigt wird.The acute angle enclosed between the two diameters is advantageously between 40 ° and 70 °. Such an angle has proven particularly useful because, in the area of the complementary obtuse angle, the arrangement of sufficiently large discharge grooves on the end face is particularly favored.

An die Abfuhrnuten ist regelmässig ein Wendel angeschlossen, aus dem sich die Drehrichtung des Gesteinsbohrers ergibt. Der spitze Winkel der gebildet wird von dem Durchmesser der Schneidplatte und dem Durchmesser auf dem die Schneidstifte liegen, ist bevorzugt auf der der Drehrichtung abgewandten Seite der Schneidplatte angeordnet.A helix is regularly connected to the discharge grooves, which determines the direction of rotation of the rock drill. The acute angle which is formed by the diameter of the cutting plate and the diameter on which the cutting pins lie is preferably arranged on the side of the cutting plate facing away from the direction of rotation.

Aus der Sicht der Zerkleinerung des Bohrgutes, hat es sich besonders bewährt, wenn die Schneidstifte geneigt zur Schaftlängsachse angeordnet sind. Auch eine Anordnung der Schneidstifte parallel zur Schaftlängsachse ist durchaus möglich.From the point of view of crushing the drill material, it has proven particularly useful if the cutting pins are arranged at an angle to the longitudinal axis of the shaft. An arrangement of the cutting pins parallel to the longitudinal axis of the shaft is also quite possible.

Die freien Stirnenden der Schneidstifte liegen vorzugsweise nicht in der von den Schneiden der Schneidplatte gebildeten Rotationsfläche, sondern sind geringfügig, zB 0,3 mm bis 1,5 mm in Bohrrichtung gesehen, zurückversetzt. Die Vorschubgeschwindigkeit während des Bohrvorganges wird dadurch gleichmässiger, da die Schneidstifte fast zur gleichen Zeit wie die Schneidplatte mit dem Untergrund in Kontakt kommen. Dies bedeutet ein gleichmässigeres Abbauen des Untergrundes. Zusätzlich übernehmen die Schneidstifte eine Abstützfunktion des Bohrkopfes in Vorschubrichtung.The free ends of the cutting pins preferably do not lie in the rotational surface formed by the cutting edges of the cutting plate, but are set back slightly, for example 0.3 mm to 1.5 mm in the drilling direction. The feed rate during the drilling process is thereby more evenly, since the cutting pins come into contact with the surface at almost the same time as the cutting plate. This means that the subsoil is dismantled more evenly. In addition, the cutting pins support the drill head in the feed direction.

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

  • Fig. 1 einen erfindungsgemässen Gesteinsbohrer, in Ansicht,
  • Fig. 2 eine stirnseitige Ansicht des in Fig. 1 dargestellten Gesteinsbohrers,
  • Fig. 3 einen Schnitt durch den Gesteinsbohrer gemäss Fig. 1 und 2, entlang der Linie III-III in Fig. 2.
The invention is explained in more detail below with reference to drawings which show an exemplary embodiment. Show it:
  • 1 is a rock drill according to the invention, in view,
  • 2 is an end view of the rock drill shown in FIG. 1,
  • 3 shows a section through the rock drill according to FIGS. 1 and 2, along the line III-III in FIG. 2.

Der aus Fig. 1 bis 3 ersichtliche Gesteinsbohrer besteht im wesentlichen aus einem Schaft 1 und einem damit verbundenen Bohrkopf 2. Der Schaft 1 ist mit einer Förderwendel 9 versehen, die einerseits der Führung des Bohrers im Bohrloch und andererseits der Abfuhr des Bohrkleins dient.The rock drill shown in FIGS. 1 to 3 essentially consists of a shaft 1 and a drill head 2 connected to it. The shaft 1 is provided with a conveying helix 9, which on the one hand serves to guide the drill in the borehole and on the other hand to remove the cuttings.

Der Bohrkopf 2 ist mit in Längsrichtung verlaufenden Abfuhrnuten 6, 10 versehen, welche dem Durchlass des Bohrkleins von der in Vorschubrichtung weisenden Stirnseite 3 des Bohrkopfes 2 zum Schaft 1 dienen. Der Bohrkopf 2 ist mit einer zentral angeordneten Schneidplatte 4 versehen. Die Schneidplatte 4 überragt den Bohrkopf 2 sowohl in radialer Richtung als auch in Vorschubrichtung. Auf der restlichen Stirnseite 3 des Bohrkopfes 2 sind Schneidstifte 5 angeordnet, die auf einem Durchmesser liegen, der mit dem Durchmesser der Schneidplatte 4 einen spitzen Winkel a einschliesst. Dieser spitze Winkel a ist - wie Fig. 3 zeigt - auf der der Drehrichtung D abgewandten Seite der Schneidplatte 4 angeordnet.The drill head 2 is provided with discharge grooves 6, 10 which run in the longitudinal direction and which serve for the passage of the cuttings from the end face 3 of the drill head 2 pointing in the feed direction to the shank 1. The drill head 2 is provided with a centrally arranged cutting plate 4. The cutting plate 4 projects beyond the drilling head 2 both in the radial direction and in the feed direction. On the remaining end face 3 of the drilling head 2, cutting pins 5 are arranged, which lie on a diameter that includes an acute angle a with the diameter of the cutting plate 4. This acute angle a is - as shown in FIG. 3 - arranged on the side of the cutting plate 4 facing away from the direction of rotation D.

Der in Fig. 3 dargestellte Schnitt zeigt deutlich die Anordnung der Schneidstifte 5 in einer geneigten Richtung zur Schaftlängsachse. Die Schneidstifte 5 sind so tief in den Bohrkopf 2 eingelassen, dass die freien Stirnenden der Schneidstifte 5 unterhalb der von Schneiden 7, 8 der Schneidplatte 4 gebildeten Rotationsfläche liegen.The section shown in Fig. 3 clearly shows the arrangement of the cutting pins 5 in an inclined direction to the longitudinal axis of the shaft. The cutting pins 5 are inserted so deeply into the drilling head 2 that the free end faces of the cutting pins 5 lie below the rotational surface formed by cutting edges 7, 8 of the cutting plate 4.

Claims (8)

Gesteinsbohrer mit Schaft (1) und einem Bohrkopf (2) der auf seiner in Vorschubrichtung weisenden Stirnseite (3) eine zumindest über den Durchmesser sich erstreckende Schneidplatte (4) und mindestens zwei Schneidstifte (5) aufweist, dadurch gekennzeichnet, dass die Schneidstifte (5) auf einem Durchmesser liegen, der mit dem Durchmesser der Schneidplatte (4) einen von 90° abweichenden Winkel bildet.Rock drill with a shank (1) and a drill head (2) on its front side (3) pointing in the direction of advance has an at least two-dimensionally extending cutting plate (4) and at least two cutting pins (5), characterized in that the cutting pins (5 ) lie on a diameter that forms an angle deviating from 90 ° with the diameter of the cutting plate (4). Gesteinsbohrer nach Anspruch 1, dadurch gekennzeichnet, dass die Schneidstifte (5) auf dem Durchmesser beidseits der Schneidplatte (4) angeordnet sind.Rock drill according to claim 1, characterized in that the cutting pins (5) are arranged on the diameter on both sides of the cutting plate (4). Gesteinsbohrer nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, dass die Anzahl der Schneidstifte (5) auf beiden Seiten der Schneidplatte (4) gleich ist.Rock drill according to one of claims 1 to 2, characterized in that the number of cutting pins (5) on both sides of the cutting plate (4) is the same. Gesteinsbohrer nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Anzahl der Schneidstifte (5) insgesamt zwei beträgt.Rock drill according to one of claims 1 to 3, characterized in that the number of cutting pins (5) is two in total. Gesteinsbohrer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Schneidstifte (5) zur Schaftlängsachse rotationssymmetrisch angeordnet sind.Rock drill according to one of claims 1 to 4, characterized in that the cutting pins (5) are arranged rotationally symmetrically to the longitudinal axis of the shaft. Gesteinsbohrer nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der von den beiden Durchmessern eingeschlossene spitze Winkel (a) zwischen 40° und 70° beträgt.Rock drill according to one of claims 1 to 5, characterized in that the acute angle (a) enclosed by the two diameters is between 40 ° and 70 °. Gesteinsbohrer nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Schneidstifte (5) zur Schaftlängsachse geneigt angeordnet sind.Rock drill according to one of claims 1 to 6, characterized in that the cutting pins (5) are arranged inclined to the longitudinal axis of the shaft. Gesteinsbohrer nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die freien Stirnenden der Schneidstifte (5) gegenüber der von den Schneiden (7, 8) der Schneidplatte (4) gebildeten Rotationsfläche zurückgesetzt sind.Rock drill according to one of Claims 1 to 7, characterized in that the free end faces of the cutting pins (5) are set back with respect to the rotational surface formed by the cutting edges (7, 8) of the cutting plate (4).
EP91810185A 1990-04-09 1991-03-21 Stone drill bit Expired - Lifetime EP0452255B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4011441A DE4011441A1 (en) 1990-04-09 1990-04-09 ROCK DRILL
DE4011441 1990-04-09

Publications (3)

Publication Number Publication Date
EP0452255A2 true EP0452255A2 (en) 1991-10-16
EP0452255A3 EP0452255A3 (en) 1992-10-28
EP0452255B1 EP0452255B1 (en) 1994-12-14

Family

ID=6404062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91810185A Expired - Lifetime EP0452255B1 (en) 1990-04-09 1991-03-21 Stone drill bit

Country Status (8)

Country Link
EP (1) EP0452255B1 (en)
JP (1) JP2880584B2 (en)
AT (1) ATE115677T1 (en)
AU (1) AU631054B2 (en)
CA (1) CA2040052C (en)
DE (2) DE4011441A1 (en)
ES (1) ES2066407T3 (en)
PL (1) PL165702B1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0685629A3 (en) * 1994-06-04 1996-12-18 Hilti Ag Rock drill bit.
WO1997019247A1 (en) * 1995-11-23 1997-05-29 Techmo Entwicklungs- Und Vertriebs Gmbh Drill bit
DE19734094A1 (en) * 1996-11-11 1998-05-14 Hawera Probst Gmbh Drill bit for boring into masonry especially concrete
EP0778390A3 (en) * 1995-12-07 1998-07-01 HILTI Aktiengesellschaft Rotary percussive twist drill
EP0943779A2 (en) 1998-03-18 1999-09-22 Plica Werkzeugfabrik Ag Percussive drilling tool
EP0943780A3 (en) * 1998-03-18 2000-07-19 Plica Werkzeugfabrik Ag Drilling tool
DE19944406A1 (en) * 1999-09-16 2001-05-03 Heller Dinklage Gmbh Geb Drill, especially rock drill, has free surface that is concave or extends inwards into cutting disc away from flat surface; free surface can be polygonal or ellipsoidal
GB2356164A (en) * 1999-09-16 2001-05-16 Heller Dinklage Gmbh Geb A drill, particularly a rock drill.
US7258180B2 (en) 2003-11-03 2007-08-21 Illinois Tool Works Inc. Rotary hammerdrill bit
EP1340604A3 (en) * 2002-02-28 2008-03-05 Robert Bosch Gmbh Drill

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998021442A1 (en) 1996-11-11 1998-05-22 Hawera Probst Gmbh Rock drill
DE19703994B4 (en) * 1997-02-03 2006-04-20 Drebo Werkzeugfabrik Gmbh drill
DE29901296U1 (en) 1999-01-26 1999-06-10 Plica Werkzeugfabrik Ag, Mollis Drilling tool
DE10024433A1 (en) 2000-05-19 2001-11-29 Hawera Probst Gmbh Rock drill
EP1302290B1 (en) 2001-10-12 2008-07-02 Robert Bosch Gmbh Drilling tool
DE10334610B4 (en) * 2003-07-29 2006-04-20 Hilti Ag wellhead
KR101161896B1 (en) * 2004-08-25 2012-07-03 미츠비시 마테리알 가부시키가이샤 Excavating tools
US7861807B2 (en) 2008-12-03 2011-01-04 Black & Decker Inc. Drill bit including one piece cutting head
KR20110128694A (en) * 2010-05-24 2011-11-30 태양파워(주) Drill bit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0428953Y2 (en) * 1986-12-02 1992-07-14
DE3825107C2 (en) * 1988-07-23 1996-07-11 Hilti Ag Rock drill with cutting insert

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0685629A3 (en) * 1994-06-04 1996-12-18 Hilti Ag Rock drill bit.
WO1997019247A1 (en) * 1995-11-23 1997-05-29 Techmo Entwicklungs- Und Vertriebs Gmbh Drill bit
EP0778390A3 (en) * 1995-12-07 1998-07-01 HILTI Aktiengesellschaft Rotary percussive twist drill
DE19734094A1 (en) * 1996-11-11 1998-05-14 Hawera Probst Gmbh Drill bit for boring into masonry especially concrete
EP0943780A3 (en) * 1998-03-18 2000-07-19 Plica Werkzeugfabrik Ag Drilling tool
DE19811887A1 (en) * 1998-03-18 1999-09-23 Plica Werkzeugfabrik Ag Mollis Hammer drilling tool
EP0943779A2 (en) 1998-03-18 1999-09-22 Plica Werkzeugfabrik Ag Percussive drilling tool
DE19944406A1 (en) * 1999-09-16 2001-05-03 Heller Dinklage Gmbh Geb Drill, especially rock drill, has free surface that is concave or extends inwards into cutting disc away from flat surface; free surface can be polygonal or ellipsoidal
GB2356164A (en) * 1999-09-16 2001-05-16 Heller Dinklage Gmbh Geb A drill, particularly a rock drill.
DE19964272C2 (en) * 1999-09-16 2003-05-28 Heller Dinklage Gmbh Geb Drills, in particular rock drills
DE19944406C2 (en) * 1999-09-16 2003-07-31 Heller Dinklage Gmbh Geb rock drill
GB2356164B (en) * 1999-09-16 2003-11-05 Heller Dinklage Gmbh Geb A drill, particularly a rock drill
EP1340604A3 (en) * 2002-02-28 2008-03-05 Robert Bosch Gmbh Drill
US7258180B2 (en) 2003-11-03 2007-08-21 Illinois Tool Works Inc. Rotary hammerdrill bit

Also Published As

Publication number Publication date
ATE115677T1 (en) 1994-12-15
AU7415991A (en) 1991-10-10
AU631054B2 (en) 1992-11-12
CA2040052A1 (en) 1991-10-10
PL165702B1 (en) 1995-01-31
EP0452255A3 (en) 1992-10-28
ES2066407T3 (en) 1995-03-01
DE4011441A1 (en) 1991-10-10
JP2880584B2 (en) 1999-04-12
PL289787A1 (en) 1991-10-21
JPH04228796A (en) 1992-08-18
EP0452255B1 (en) 1994-12-14
CA2040052C (en) 1998-09-29
DE59103840D1 (en) 1995-01-26

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