EP0595214A2 - Foret à roche - Google Patents

Foret à roche Download PDF

Info

Publication number
EP0595214A2
EP0595214A2 EP93117125A EP93117125A EP0595214A2 EP 0595214 A2 EP0595214 A2 EP 0595214A2 EP 93117125 A EP93117125 A EP 93117125A EP 93117125 A EP93117125 A EP 93117125A EP 0595214 A2 EP0595214 A2 EP 0595214A2
Authority
EP
European Patent Office
Prior art keywords
drill
helix
head
drilling
cutting
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
EP93117125A
Other languages
German (de)
English (en)
Other versions
EP0595214B1 (fr
EP0595214A3 (fr
Inventor
Bernhard Moser
August Haussmann
Hans Ulrich Mütschele
Harald Schindler
Hans-Peter Dr. Meyen
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.)
Robert Bosch GmbH
Robert Bosch Power Tools GmbH
Original Assignee
Hawera Probst Hartmetall Werk Zeugfabrik Ravensburgh KG
Robert Bosch GmbH
Hawera Probst GmbH
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 Hawera Probst Hartmetall Werk Zeugfabrik Ravensburgh KG, Robert Bosch GmbH, Hawera Probst GmbH filed Critical Hawera Probst Hartmetall Werk Zeugfabrik Ravensburgh KG
Publication of EP0595214A2 publication Critical patent/EP0595214A2/fr
Publication of EP0595214A3 publication Critical patent/EP0595214A3/fr
Application granted granted Critical
Publication of EP0595214B1 publication Critical patent/EP0595214B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/56—Button-type inserts
    • 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
    • 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
    • Y10T408/905—Having stepped cutting edges
    • Y10T408/906—Axially spaced
    • Y10T408/9065—Axially spaced with central lead
    • 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

Definitions

  • the invention relates to a rock drill according to the preamble of claim 1.
  • drilling tools for stone processing have become known, in which the radially arranged cutting blades have axially extending outer cutting blade edges which are equipped with hard metal pins, whereby between the radially outer cutting blade edges and the central centering point, flat depressions are provided, which are also equipped with hard metal pins.
  • the drilling tools according to EP 0 347 601 A1 mentioned at the outset and the German utility model GM-81 04 116 (Bosch, FIG. 5) are designed with largely flat cutting blades on their end face.
  • the well-known drilling tools in particular for making breakthroughs in concrete or masonry, which are also referred to as breakthrough drills, are based on the principle that the rock material is shattered by the impact of a heavy hammer drill, whereby the hard metal cutting edges, like pointed chisels, cause an explosive effect in the brittle material . If only the radially outer, axially protruding edge area of the drilling tool according to DE-27 56 990 (Krupp) or DE-28 56 205 (HILTI) acts, the stone material is removed in a pot-shaped manner, the radially inner area also being removed due to the brittleness of the material breaks away.
  • the axially protruding wall areas lead to an increased pointed chisel effect and thus to an increased removal.
  • the axially recessed, inner area of the cutting blades is also covered with hard metal pins in the known drilling tools. However, these do not primarily serve to remove material, but to shred the material that has already broken away.
  • a cup-shaped design of the drill bit with axially protruding edges does have the advantage of increased surface pressure and thus increased drilling performance, since the axially recessed recesses do not or only insignificantly contribute to the removal of the rock.
  • This can lead to the drilling tool practically on a drilling dust cushion in these largely flat end regions of the cutting blades is seated, which leads to a certain damping of the impact and thus to a reduction in drilling progress.
  • the known tools generally have a boring head, which is not followed by a conveyor spiral connected in one piece. Rather, according to the representation in EP 0 347 601 A1 (Hawera), additional conveying coils that can be placed on the smooth drill shaft are used for the transport of drilling dust. These additional conveying spirals, in particular made of plastic, are subject to increased wear and, in particular, cannot contribute to the solidification of the drilling tool as a whole.
  • a drilling tool has become known from the Westa company, the drilling head of which has four cross-shaped, radially running cutting blades which are covered with hard metal plates.
  • This drill bit is connected in one piece to a double-start conveyor helix, the ends of which on the drill head end in an axially parallel surface of the two opposing cutting blades, so that these two cutting blades are very bulky, while the two further cutting blades arranged at right angles to them are severely undercut by the respective conveyor helix.
  • a "crown drill” has become known which has a drill head with two cutting blades with intermediate drillings outlets to form a double conveyor helix connected in one piece with it.
  • the respective spiral feed end ends in the entire radial width of the respective cutting blade, so that the drill head is very asymmetrical and bulky and the cutting blades have a very different material support from the conveyor helix.
  • the rock drill according to the invention with the characterizing features of claim 1 has the advantage that a drilling tool is created which has been optimized and improved in several respects compared to the known drilling tools.
  • a low weight that is acceptable for a one-piece tool is achieved despite the one-piece construction, and a robust tool with simple handling. Due to the special shape of the drill head in connection with a conveyor helix that runs in one piece, high drilling capacities are achieved both in new and used condition and thus a long service life.
  • the invention is based on the core idea that the advantageous properties of a drilling tool of the type described in the introduction, ie a drill bit such as is shown in DE-28 56 205 A1 of DE 27 56 990 C2 or DE-U 90 02 460, for example improve, an increased drilling performance can be achieved.
  • the invention is initially based on a tool in which the feed spiral is connected in one piece to the drill head. This reduces the wear on the drill helix and thus significantly improves the service life.
  • a drilling head with a conveyor helix connected in one piece herewith initially has the serious disadvantage that a very bulky tool is formed in the region of the drilling head due to the outlet of the conveyor helix into the drilling head.
  • the invention is used in such a way that a drilling tool with a drilling head is created, in which the drilling head maintains a symmetrical and, for example, bell-shaped outer contour, despite a one-piece connection to a conveying helix, as is the case in principle in the cited prior art (HILTI), however, without a conveying helix is shown.
  • HILTI conveying helix
  • This can be achieved in connection with a one-piece integrated feed helix in that the outlet area at the end of the feed helix on the drill head side and in particular the subsequent wall section on the drill head is shaped in such a way that not only a cylindrical outer contour with an outer helix of this feed head section but a harmonious transition from the helix is achieved in the drill head.
  • the drill head is therefore largely symmetrically rounded in its outer contour or lateral surface and in particular constructed bell-shaped, the outlet of the feed spiral being integrated into these areas.
  • the aim of the drilling tool according to the invention is therefore to create a drilling head that is as symmetrical and, in particular, bell-shaped as possible, in which the transition from the feed spiral into the drilling head is carried out in such a way that an approximately bell-shaped outer contour of the drilling head is largely retained.
  • the goal of a construction of the drill head that is as symmetrical as possible with a harmonious transition of the double conveyor helix has the consequence in the drilling tool according to the invention that optimal vibration conditions are created in the drilling tool.
  • the transition from the conveying helix into the shaft region again takes place harmoniously without any significant cross-sectional jumps by providing an arcuate transition of the outlet of the conveying helix into the drill shaft.
  • Large radii at the transition of the drill shank into the inlet area of the feed spiral prevent stress peaks in these areas as far as possible.
  • the entire drill shank has as few cross-sectional jumps as possible which lead to voltage peaks.
  • Drill diameters of 65 or 80 mm, for example, the drill shank in the area of the helical inlet is much stronger than at its clamping end.
  • this diameter transition is carried out by conical shank areas, wherein according to the invention cylindrical areas are provided between the conical areas, on which the drill shank can be easily clamped in a jaw chuck for machining.
  • a long drill shaft the length of which can be 300 mm or more, can be connected to the feed spiral by means of a friction welding process or the like.
  • the shaft can be aligned by clamping the partly conical shaft on the cylindrical shaft sections.
  • the formation of the rock drill is particularly advantageous in that the drill head has four ring segments interrupted by breakthroughs or grooves, as is known in principle from DE 28 56 205 with three ring segments.
  • the ring segments are roof-shaped or V-shaped in their end region, so that the cutting pin set, which is set obliquely with respect to the longitudinal axis of the drill bit, can be placed on the two flanks of the roof-shaped configuration. This results in an optimal application of force to the stone material on the face side.
  • weight is also saved due to the waisted design of the drill head in the area of the feed spiral outlet, which increases the safety against breakage due to the avoidance of voltage peaks.
  • the outside diameter of the drill head is expediently chosen to be larger than the outside diameter of the conveying helix in order to avoid tilting of the tool, while still maintaining an optimal longitudinal guidance.
  • the helix is expediently only made as long as is absolutely necessary for the removal of drilling dust.
  • the length of the conveying helix is expediently chosen to be at least twice the diameter of the drill head in order to achieve adequate support of the drill head and removal of drill dust.
  • the cup-shaped drill head has a cutting blade base, which in cross-section is designed in the shape of an arc or a circle between the radially outer edge segment and the centrally arranged centering tip. This has the advantage that there is no high surface pressure on flat surfaces at any point.
  • the arc-shaped or circular base of the cutting blades also has a cutting pin attachment known per se, which, however, is arranged on the one hand directly next to a radial groove, and on the other hand centrally on a cutting blade. Due to the radial offset of these cutting pins and the arrangement on the floor which is circular in cross section, an optimal discharge of drilling material results from this recessed arcuate part of the cutting blades.
  • the recesses or grooves between the ring segments protrude as far as possible into the center of the drill head in order to remove the drilling dust that is collected there as easily as possible into the drilling dust grooves of the production helix.
  • the groove is arranged obliquely in the area of the outlet of the conveyor spiral in order to lead into the conveyor spiral located radially there.
  • the drilling tool 1 shown in FIGS. 1, 1a in two side views and in a top view in FIG. 1b consists of a drill shank 2 and a drill head 3, which is also referred to below as a "cross-drill head". Between the drill head 3 and the drill shaft 2 there is a conveyor helix 4 which is connected in one piece to it and which is designed as a double helix or two-start helix with the helices 4 ', 4' '.
  • the drill head 3 of the drilling tool has a central drill head tip 5, which is equipped with a roof-shaped hard metal cutting element 6. 1b, the rock drill 1 has radially extending cutting blades 7 to 10 to form a drill bit 4, which are separated or interrupted by cutouts or grooves 11, 11 'or 12, 12'.
  • FIG. 1a results from the side view of FIGS. 1 and 1b from the direction of the arrow 13 in FIG. 1b.
  • the first conveyor helix 4 'of a double conveyor helix 4', 4 '' ends in the region of the recess 11 along the edge 17, the region 14 following the conveyor helix 4 'supporting the cutting blade 9 above it in terms of material, whereby this is reinforced to a certain extent.
  • the left-hand cutting blade 10 shown in FIGS. 1, 1b is not supported in terms of material due to the conveying helix 4 ′ underneath, so that the outer contour of the drill head in this area is V-shaped or bell-shaped.
  • the blade 10, which is slender in its longitudinal cross section, would consequently be followed by a cutting blade 9 which is made of material.
  • the cutting blades 9 and 7 following the respective drill helix outlet are subjected to additional machining treatment in such a way that the helical outlet (Edge 17) subsequent area 14 receives a concave constriction or waist 15, which extends over the entire outer surface of the respective cutting wing 9, 7.
  • the region 14, which is initially thick in material receives a material removal which rounds the outer contour of the drill head in a bell-shaped manner, as is shown in principle in the drilling tool according to DE 28 56 205 (HILTI), however, without a conveying helix.
  • This waist of the area following the respective conveyor helix achieves a harmoniously rounded transition to the next successive wing or the next successive recess between the wings.
  • the drill head can be made narrow and delicate even with large tools.
  • FIGS. 2b and 2c show a longitudinal section through the wings 7, 9 with the material support of the conveyor 4 ', 4''in the subsequent area 14, the concave constriction 15 leads to a material cross-section 38 which is approximately the same in its wall thickness s1 as the wall thickness s2 of the cross-section 39 of the two wings 8, 10, which lie above the respective helical feed groove 4 ', 4'', ie are not material-supported.
  • the recesses 11, 11 'in the area of the outlet 17 of the respective feed helix 4', 4 '' lie on a larger drill core diameter d 1 since this area is considerably larger than the core diameter d 2 in the area of the recesses 12, 12 '. Accordingly, the recesses 11, 11 'must be guided in an approximately 45 ° bevel 16 into the outlet of the respective conveyor helix 4', 4 '' (outlet edge 17). In contrast, the recesses 12, 12 'can be guided almost vertically in the respective lower sections of the conveyor helix 4', 4 ''. The associated outlet slope 18 can therefore be kept very steep (see Fig. 1b).
  • each cutting blade 7 to 10 each has a ring segment 19, which is formed in its front area as a roof-shaped configuration with a first outwardly facing slope 21 and a second inwardly facing slope 22.
  • each ring segment 19 has at least one cutting element 23, 23 'or 24, 24', at least on its outer bevel 21.
  • the two ring segments 19 of the cutting blades 7, 9 have a further cutting element 25, 25 'on the inward slope 22.
  • the two cutting blades 7, 9 each have on their roof-shaped bevels 20 two cutting elements 24, 25 and 24 ', 25', respectively, which are arranged asymmetrically with the angle indications ⁇ shown in FIG. 1b, the angle ⁇ at 0 designated lower position in Fig. 1b begins.
  • the cutting blades 8, 10 each have a cutting element 23, 23 'only on their outer bevels 21, which are arranged symmetrically on the respective cutting blade.
  • the cup-shaped design of the drill head 3 to the side of the drill head tip 5 each has an arcuate or semicircular course, which is referred to as a circumferential, arcuate base 28.
  • the circumferential bottom 28 of the cutting blades is therefore strongly arched, so that this always results in an axial thrust on the drilling dust collected therein in order to feed it into the recesses 11, 12.
  • the arcuate bottom 28 has, for example in the cutting blade 7 or 10, a further cutting element 26 which is inclined at an angle ⁇ 2 ⁇ 30 ° with respect to an axis-parallel vertical 40 inwards towards the drill axis 30 is.
  • the central axis 29 of the cutting element 26 forms the surface normal to the arcuate surface 28.
  • the arrangement of the cutting element 26 is at the same angular distance ⁇ 6 as the arrangement of the cutting element 23 'on the slope 21.
  • the arcuate bottom 28 has a further cutting element 27, which is also inclined by an angle ⁇ 3 ⁇ 30 ° with respect to an axis parallel 40 to the outside. According to the additional illustration in FIG. 1 b, this cutting element 27 is arranged radially further inwards than the cutting element 26.
  • the central axis 29 in turn forms the surface normal to the arcuate base surface 28 of the drill head.
  • the two cutting elements 24, 24 'with the central axis 29 and the two cutting elements 25, 25' with the central axis 29 ' are also inclined at an angle ⁇ 1 ⁇ 30 ° to a vertical 40.
  • the curved bottom 28 can be trough-shaped in the lower section in drilling tools with larger drilling diameter D 1, i.e. the centers 41, 41 'of the radii R1 are laterally apart by an amount S3, so that there is a corresponding flat bottom area 42 with the same width S3.
  • Fig. 1a the angle ⁇ ⁇ 120 to 130 ° for the roof-shaped slope of the hard metal cutting element 6 is additionally shown.
  • the diameter D2 of the drill head tip 5 is D2 ⁇ 12 mm with a drilling tool of D1 ⁇ 65 mm.
  • the length l1 of the conveyor spiral 4 is such that it is at least twice as large as the diameter D1, ie l1 ⁇ 2 x D1 .
  • FIG. 3a again shows the view of the drilling tool according to FIG. 1
  • FIG. 3b shows the lower inlet area 36, 36 'of the respective conveyor helix 4', 4 ''.
  • This transition or inlet area of the conveyor helix 4 ', 4'' is formed from the drill shaft 2 into the helical region such that the radially outer end 43, 43 'leads tangentially to the outer diameter D4 of the drill shaft 2 via an arcuate curve 37, 37'.
  • This arcuate or spiral inlet of the respective conveyor helix is shown in FIG. 3b with the arrows 44.
  • the curve 45, 45 ' which is also shown in FIG. 3b, results from the rounded transition of the respective adjacent conveyor helix 4', 4 ''.
  • the area between the curves 37, 45 and 37 ', 45' lies with the large radius of curvature R2 in the drill shank 2 (Fig. 3a), so that voltage peaks are avoided.
  • the greatly rounded outlet 37, 37 'of the respective feed helix 4', 4 '' in the drill shaft 2 further prevents jamming of the feed helix ends in a bore wall.
  • FIG. 4 shows the complete drilling tool with attached drill shank 2, which is shown again in isolation in FIG. 4a.
  • the drill shaft 2 has a total length l3, which is generally more than 300 mm.
  • the drill shank 2 is generally connected to the cylindrical end 46 below the feed helix 4 via a friction weld connection 31.
  • the diameter D4 at this interface 31 is larger than the diameter D5 of the lower clamping part 33, so that the drill shaft tapers l3 over its length.
  • this tapering can be carried out by a one-piece conical component or by cylindrical shoulders with cross-sectional jumps.
  • Cylindrical shoulders for tapering the diameter of the drill shank have the disadvantage compared to a conical design that stress peaks occur at each jump in diameter due to the striking stress on the drilling tool, which lead to an increased load on the drilling tool. Shock wave reflections continue to occur on the individual paragraphs due to the impact impulses, which have a disadvantageous effect on the tool and in particular the strength of the tool.
  • the vibration behavior of such a tool is negatively influenced due to the cross-sectional jumps.
  • a disadvantage of a conical design of the drill shaft is the unfavorable absorption and clamping possibility when friction welding and when straightening the drill shaft.
  • very different cone angles result, which require special clamping jaws or special collets for clamping such a conical shank.
  • the invention provides that the drill shank 2 is designed in steps from the lower insertion end or clamping part 33 to the upper drill head connection, the transitions of the steps each being conical.
  • This design achieves the advantage of increased performance, ie better passage of the impact impulses and the avoidance of reflections on the heels.
  • the batch-wise cylindrical design also enables problem-free picking up and clamping of the drill shaft both in the production of the friction weld connection 31 and in the straightening of such a tool. With different lengths of the drill shank, the design each area optimally. Measurements have shown that significant improvements in performance can be achieved through these measures. In the exemplary embodiment of such a drill shaft according to FIG.
  • the drill shaft 2 is connected to the feed helix 4 via the friction weld connection 31, at least the uppermost part 32 with the length l4 being designed as a cylindrical shaft part 32 and between this cylindrical shaft part 32 and the lower clamping part 33 for the drive machine in particular two conical shaft sections 34, 35 with a length l5 and l7 are provided.
  • the drill shaft 2 accordingly consists of sections of an upper cylindrical section 32 with the length l4, a subsequent conical section 34 with the length l5, a further cylindrical shaft section 47 with the length l6 and a further conical shaft section 35 with the length l7, which is the Clamping part 33 with the length l8 connects.
  • the lengths l4, l6 of the cylindrical shaft sections 32, 47 have an axial length which preferably corresponds to two to four times the upper shaft diameter D4 in order to obtain a sufficient length for clamping this shaft part.
  • the drill shank can be used on its cylindrical parts without any problems in a conventional chuck or jaw chuck or in other usual clamping devices.
  • the invention is not restricted to the exemplary embodiment shown and described. Rather, it also includes all professional developments and refinements within the scope of the inventive idea.
EP93117125A 1992-10-29 1993-10-22 Foret à roche Expired - Lifetime EP0595214B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4236553 1992-10-29
DE4236553A DE4236553A1 (de) 1992-10-29 1992-10-29 Gesteinsbohrer

Publications (3)

Publication Number Publication Date
EP0595214A2 true EP0595214A2 (fr) 1994-05-04
EP0595214A3 EP0595214A3 (fr) 1995-03-01
EP0595214B1 EP0595214B1 (fr) 1998-01-14

Family

ID=6471663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93117125A Expired - Lifetime EP0595214B1 (fr) 1992-10-29 1993-10-22 Foret à roche

Country Status (3)

Country Link
US (1) US5403130A (fr)
EP (1) EP0595214B1 (fr)
DE (2) DE4236553A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3581756A1 (fr) * 2018-06-11 2019-12-18 HILTI Aktiengesellschaft Dispositif de forage

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE282366T1 (de) * 1993-06-10 2004-12-15 Karlin Technology Inc Wirbeldistraktor
DE4338667A1 (de) * 1993-11-12 1995-05-18 Hilti Ag Bohrwerkzeug
US5915485A (en) * 1997-01-13 1999-06-29 Mcatavey; Dennis B. Ski post hole auger bit
DE19748987B4 (de) * 1997-11-06 2007-11-22 Robert Bosch Gmbh Bohrwerkzeug insbesondere für drehschlagendes Bohren von vorzugsweise Gestein
US6196091B1 (en) 1999-03-17 2001-03-06 Thomas & Betts International Drill bit for applying torque to a fastener
US6374931B1 (en) 1999-11-03 2002-04-23 Relton Corporation Multiple cutter rotary hammer bit
DE20016012U1 (de) 2000-09-15 2000-11-30 Drebo Werkzeugfab Gmbh Gesteinsbohrer
US20020164218A1 (en) * 2001-02-28 2002-11-07 Ruben Aguirre Fluted drill tool with frustum cutters
US8517644B2 (en) * 2007-06-07 2013-08-27 Allied Machine & Engineering Corporation Adjustable indexable drill and modular system and holder
US8926237B2 (en) * 2011-07-11 2015-01-06 Kennametal Inc. Multi-piece twist drill head and twist drill including the same
US10507534B2 (en) 2016-03-17 2019-12-17 O-Tags, Inc. Systems, methods, and apparatus for reliably installing survey tags

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2756990C2 (de) * 1977-12-21 1986-03-27 Fried. Krupp Gmbh, 4300 Essen Gesteinsbohrer
DE3540355A1 (de) * 1985-11-14 1987-05-21 Duss Maschf Bohrer zum drehschlagenden bohren
DE3614010A1 (de) * 1986-04-25 1987-11-05 Krupp Gmbh Gesteinsbohrer
GB2212091A (en) * 1987-11-12 1989-07-19 Boart Hardmetals Drilling equipment
EP0334806A1 (fr) * 1988-03-21 1989-09-27 HILTI Aktiengesellschaft Couronne de forage de roche
DE3919264A1 (de) * 1989-06-13 1990-12-20 Duss Maschf Drehschlagbohrer fuer ein von hand fuehrbares bohrgeraet
EP0470045A1 (fr) * 1990-08-03 1992-02-05 HILTI Aktiengesellschaft Ciseau avec tige optimisé

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2383212A (en) * 1944-02-19 1945-08-21 Walter B Pohle Shank construction
DE2152127C3 (de) * 1971-10-20 1982-05-06 Meißner, Joachim, 2000 Hamburg Gesteinsbohrer
DE2856205A1 (de) * 1978-12-27 1980-07-10 Hilti Ag Gesteinsbohrer
DE8025879U1 (de) * 1980-09-27 1981-02-12 Toepfer, Rainer, 2807 Achim Gesteindrehschlagbohrer o.dgl.
DE8104116U1 (de) * 1981-02-14 1982-08-05 Robert Bosch Gmbh, 7000 Stuttgart Gesteinsbohrer
DE3635538A1 (de) * 1986-10-18 1988-04-28 Hawera Probst Kg Hartmetall Bohrwerkzeug mit austauschbarer foerderwendel
DE3813849A1 (de) * 1988-04-23 1989-11-02 Hawera Probst Kg Hartmetall Gesteinsbohrer
DE3820697A1 (de) * 1988-06-18 1989-12-21 Hawera Probst Kg Hartmetall Bohrwerkzeug
DE9002460U1 (fr) * 1990-03-02 1990-05-03 Drebo Werkzeugfabrik Gmbh, 7963 Altshausen, De
US5265688A (en) * 1990-04-09 1993-11-30 Hilti Aktiengesellschaft Rock drill

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2756990C2 (de) * 1977-12-21 1986-03-27 Fried. Krupp Gmbh, 4300 Essen Gesteinsbohrer
DE3540355A1 (de) * 1985-11-14 1987-05-21 Duss Maschf Bohrer zum drehschlagenden bohren
DE3614010A1 (de) * 1986-04-25 1987-11-05 Krupp Gmbh Gesteinsbohrer
GB2212091A (en) * 1987-11-12 1989-07-19 Boart Hardmetals Drilling equipment
EP0334806A1 (fr) * 1988-03-21 1989-09-27 HILTI Aktiengesellschaft Couronne de forage de roche
DE3919264A1 (de) * 1989-06-13 1990-12-20 Duss Maschf Drehschlagbohrer fuer ein von hand fuehrbares bohrgeraet
EP0470045A1 (fr) * 1990-08-03 1992-02-05 HILTI Aktiengesellschaft Ciseau avec tige optimisé

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3581756A1 (fr) * 2018-06-11 2019-12-18 HILTI Aktiengesellschaft Dispositif de forage
WO2019238411A1 (fr) * 2018-06-11 2019-12-19 Hilti Aktiengesellschaft Dispositif de forage
US11525308B2 (en) 2018-06-11 2022-12-13 Hilti Aktiengesellschaft Drilling device

Also Published As

Publication number Publication date
DE4236553A1 (de) 1994-05-05
DE59307989D1 (de) 1998-02-19
EP0595214B1 (fr) 1998-01-14
US5403130A (en) 1995-04-04
EP0595214A3 (fr) 1995-03-01

Similar Documents

Publication Publication Date Title
EP1273372B1 (fr) Foret pour maçonnerie
DE3339211C2 (fr)
EP0657617B1 (fr) Trépan de roche
EP0778100B1 (fr) Foret héliocoidal de percussion
DE3820695C2 (de) Gesteinsbohrer
EP0790877B1 (fr) Outil de percage
EP0778391A2 (fr) Perceuse rotative hélicoidale à percussion
EP0595214B1 (fr) Foret à roche
DE2856205A1 (de) Gesteinsbohrer
EP0707129B1 (fr) Outil de forage avec support et éléments de coupe
DE60106587T2 (de) Schlagbohrmeissel
EP0730082A2 (fr) Tête de forage pour forage rotatif avec percussion
EP1015727B1 (fr) Outil de percage
EP0771934B1 (fr) Accouplement pour tiges de forage à percussion
EP1083295B1 (fr) Outil de forage
DE19709771B4 (de) Gesteinsbohrer
EP0778390B1 (fr) Perceuse rotative hélicoidale à percussion
EP0334806B1 (fr) Couronne de forage de roche
EP3289162B1 (fr) Foret à glace
DE19915304A1 (de) Bohrwerkzeug
DE4301191A1 (de) Gesteinsbohrwerkzeug
DE10038039A1 (de) Bohr- und/oder Meißelwerkzeug
DE3613264A1 (de) Mehrzweckbohrer
EP1188897B1 (fr) Trépan de forage de roche
DE19915305A1 (de) Bohrwerkzeug

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: A2

Designated state(s): CH DE DK FR GB IT LI SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): CH DE DK FR GB IT LI SE

17P Request for examination filed

Effective date: 19950707

17Q First examination report despatched

Effective date: 19960208

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

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

Kind code of ref document: B1

Designated state(s): CH DE DK FR GB IT LI SE

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: 19980114

Ref country code: GB

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: 19980114

Ref country code: FR

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: 19980114

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 59307989

Country of ref document: DE

Date of ref document: 19980219

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 FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19980414

Ref country code: DK

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: 19980414

EN Fr: translation not filed
RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: ROBERT BOSCH GMBH

Owner name: HAWERA PROBST GMBH

GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19980114

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

Ref country code: LI

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

Effective date: 19981031

Ref country code: CH

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

Effective date: 19981031

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
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

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

Ref country code: DE

Payment date: 20071219

Year of fee payment: 15

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: 20090501