US20190234150A1 - Hartmetalleinsatz und Gesteinsbohrer - Google Patents

Hartmetalleinsatz und Gesteinsbohrer Download PDF

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Publication number
US20190234150A1
US20190234150A1 US15/772,776 US201615772776A US2019234150A1 US 20190234150 A1 US20190234150 A1 US 20190234150A1 US 201615772776 A US201615772776 A US 201615772776A US 2019234150 A1 US2019234150 A1 US 2019234150A1
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US
United States
Prior art keywords
tip
cutting
cutting lip
carbide insert
lip
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.)
Abandoned
Application number
US15/772,776
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English (en)
Inventor
Jürgen Miebach
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.)
Colt & Riss GmbH
Original Assignee
Colt & Riss 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 Colt & Riss GmbH filed Critical Colt & Riss GmbH
Assigned to COLT & RISS GMBH reassignment COLT & RISS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MIEBACH, JUERGEN
Publication of US20190234150A1 publication Critical patent/US20190234150A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • 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
    • 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
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
    • B28D1/146—Tools therefor
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/75—Stone, rock or concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/08—Side or plan views of cutting edges
    • B23B2251/085—Discontinuous or interrupted cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/18—Configuration of the drill point
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/50—Drilling tools comprising cutting inserts

Definitions

  • the invention relates to a carbide insert for a rock drill, which is configured as a non-percussively operating twist drill for drilling rock, rock-like material, hard plastics, glass or the like with a cylindrical drill body and a working end having the carbide insert, the carbide insert having two cutting lips which are radially opposite one another relative to an axis of drill rotation and are arranged at an angle to one another to form a centering tip and with each of which a peripheral conveyor spiral is associated.
  • the invention further relates to a rock drill with the carbide insert.
  • One object of the invention is to provide a carbide insert of the above type or a rock drill with this carbide insert by means of which a drilled hole can be introduced more quickly, easily and simply and with less risk of damage into a workpiece of rock, rock-like material, hard plastics, glass or the like.
  • the object addressed is achieved according to the invention by the features of claim 1 .
  • Advantageous further developments are described in the subclaims.
  • the object addressed is achieved by the cutting lips simply being configured asymmetrically to one another, wherein at least one of the cutting lips defines over its radial profile, in a central region spaced from its radial ends, a tip projecting in the drilling direction for initiating transverse motion.
  • the at least one cutting lip comprises the tip projecting in the drilling direction.
  • the cutting behavior of the two cutting lips differs.
  • a transverse force is exerted on the rock drill by the tip projecting in the drilling direction by means of which force the rock drill is pushed away in a predominantly radial direction and thus forced into transverse motion.
  • the rock drill may be pushed away in the direction away from the tip and towards the respective other cutting lip.
  • the other cutting lip is accordingly pushed harder against the bottom of the drilled hole, which in turn assists or initiates radial counterpressure and thus countermotion to the pushing away of the rock drill.
  • percussive motion is exerted in the drilling direction on the bottom of the drilled hole, whereby the latter is subjected to very severe alternating loads.
  • the transverse motion initiated by the tip acts transversely of the drilling direction, however, and thus incomparably more gently on the workpiece than percussive drilling, such that drilled holes can be introduced quickly and gently even into sensitive, brittle materials such as tiles and glass.
  • the rock drill enters into a transverse motion which oscillates relative to the drilling direction.
  • the transverse motion may also be described as wobble.
  • the transverse motion of the working end sweeps the entire cross-sectional area of the bottom of the drilled hole and thereby leads, depending on the material to be drilled, to easier and more effective comminution by scraping, attrition, crushing, crumbling or the like of the material at the bottom of the drilled hole.
  • this transverse motion the material at the bottom of the drilled hole is loosened without drilling pressure having to be built up at the bottom of said hole, which leads to the risk of the material bounding the drilled hole being destroyed.
  • the material is comminuted to a greater degree by the carbide insert according to the invention or by the rock drill having this carbide insert than in the case of comparable rock drills of the type in question, such that this material may more readily be discharged contrary to the drilling direction.
  • the tip generally constitutes a discontinuity of the cutting lip over the radial profile thereof, wherein at this location continuous cutting is interrupted and thus a break is produced relative to the radially adjacent material. The material at the bottom of the drilled hole is thus comminuted to a greater degree on removal and may therefore be more readily transported away from the drill tip contrary to the drilling direction.
  • the at least one cutting lip may comprise precisely one tip protruding in the drilling direction. It may in particular have just this one tip. In particular, the tip may extend with its lateral flanks over the entire radial extent of the at least one cutting lip. The tip may have one free end with an end point. The end point is arranged at a specific radius relative to the axis of drill rotation.
  • the cutting lips may be arranged radially opposite one another. They may converge in the middle in the manner of a roof to form the centering tip.
  • This tip may be rounded at the end. It may take the form of a projection. With regard to reduced friction losses and thus heating at the bottom of the drilled hole, it is proposed that the tip itself protrude radially to the right and left of same out of a continuous shape profile of the at least one cutting lip. The tip may itself constitute at the end a discontinuity in the shape profile of the at least one cutting lip.
  • the entire cutting lip forms this one tip.
  • the tip may extend over the entire or virtually the entire cutting lip and terminate at a specific radius with its free end in an end point.
  • the entire cutting lip is divided into two portions, which are arranged angled relative to one another in the manner of a gable, so forming the tip.
  • the cutting lip converges from its two radial ends to the tip. It may structurally advantageously simply be provided that the tip of the at least one cutting lip is defined radially inwardly and radially outwardly in each case by an uncurved or by a concavely curved free-running surface.
  • a tip defined by uncurved free-running faces may be regarded as more robust with regard to wear and/or to damage than a tip defined by curved free-running faces, it may also at the same time be regarded as less sharp or less effective with regard to generating the oscillating reciprocating motion. Therefore, the carbide insert and thus the rock drill with the carbide insert may be adapted to specific materials to be drilled by way of the configuration of the tip.
  • the cutting edge of the cutting lip may be formed by the associated free-running faces and the associated body faces sloping contrary to the drilling direction of the carbide insert.
  • the entire cutting edge of the at least one cutting lip is defined by these free-running faces with the body faces of the carbide insert sloping contrary to the drilling direction.
  • the tip of the at least one cutting lip is defined radially inwardly and radially outwardly by an uncurved or by a concavely curved free-running surface.
  • the profile of the cutting edge of the at least one cutting lip may comprise, relative to a radial-axial plane comprising the drilling direction, two straight lines converging at the tip in the case of uncurved free-running surfaces or two concave arcs converging at the tip in the case of curved free-running surfaces.
  • said radial-axial plane is arranged perpendicular to the thickness direction.
  • the tip of the at least one cutting lip may alternatively be formed radially inwardly by an uncurved free-running surface and radially outwardly by a concavely curved free-running surface or, conversely, radially inwardly by a curved free-running surface and radially outwardly by a concavely uncurved free-running surface.
  • the curved free-running surface may define part of a semi- or partly cylindrical volume.
  • the free-running surfaces of the cutting lips adjoin one another radially in the middle, so forming a transverse lip.
  • the axis of rotation preferably intersects the transverse lip.
  • the relative radial position of the tip over the at least one cutting lip may have a decisive influence on the oscillating transverse motion.
  • the tip may divide the cutting lip into two radial portions, i.e. a radially outer portion and a radially inner portion.
  • the ratio of the length of the outer portion to that of the inner portion may be 1, preferably 2 or 4. The greater the ratio, the further radially outwards is the tip and the greater is the transverse force to be expected.
  • the centering tip may be tapered preferably axially symmetrically relative to the axis of rotation.
  • a second flute-like recess extending into the associated conveyor spiral may be introduced into the drill body solely or additionally radially outwardly, in each case in a leading position relative to the cutting lip in the direction of drill rotation and in particular at an angle of less than 60° to the radial direction of the associated cutting lip.
  • the cutting edge may thus in each case form a boundary for the first and/or the second recess and is formed with and by introduction of the respective recess.
  • the recesses may in each case extend from the associated cutting lip to the conveyor spiral associated with this cutting lip and possibly lead thereinto. They thus enable improved discharge of the material removed by drilling contrary to the drilling direction in the form of powder, grit and/or particles.
  • the recesses may each be of concave configuration. They may each define part of a partly to semi-cylindrical volume.
  • the two recesses of a cutting lip may each form a region of this cutting lip and adjoin one another radially, so forming a discontinuity in the radial profile of the cutting lip.
  • This discontinuity may, as described above in connection with the tip, bring about breaking of the cut material, whereby this may be comminuted and thus more readily transported away.
  • the discontinuity formed by the mutually adjoining recesses may be arranged at a radial point of the cutting lip which is different from the free end point of the tip of this cutting lip. Provision may in particular be made for the discontinuity, formed by the mutually adjoining recesses, of the cutting lip to be arranged radially inwards relative to the tip of this cutting lip.
  • This discontinuity, formed by the mutually adjoining recesses, of the cutting lip may be a tip pointing in the circumferential direction which does not project in the drilling direction.
  • the first flute-like recess may be arranged to extend radially beyond the center axis of the carbide insert. This may form a radially inner region of the associated cutting lip and a radially inner region of the free-running edge associated with the other cutting lip.
  • first recess and/or second recess may be arranged angled by an angle of attack towards the axis of drill rotation in the drilling direction.
  • the recesses may be arranged inclined relative to one another towards the axis of drill rotation in the drilling direction.
  • the geometry of the centering tip may thus also be decisively modified to the effect that, depending on the depth of the first recess, the above-described transverse lip, which in itself can only be considered to have a scraping cutting, can be reduced in favor of extension of the cutting lip. It is however considered advantageous, for the sake of the robustness and stability of the centering tip, to keep the transverse lip and thus the thickness of the centering tip small.
  • the length of the transverse lip may amount to a few or up to three or up to six decimillimeters. It may amount to up to 5% or 3% of the diameter of the masonry drill.
  • the centering angle of the centering tip may also influence the transverse motion, since the greater the centering angle, the smaller a centering action of the centering tip may be and the greater may be the possible transverse motion of the rock drill, counteracting centering, during drilling. Provision may in particular be made for the centering tip to have a centering angle which amounts for drilling of for example glass to preferably 50° to 70°, for drilling of for example wall tiles to 70° to 80° or for drilling of for example floor tiles, thermosets and hard composites to 110° to 140°.
  • the two cutting lips may each have the tip projecting in the drilling direction.
  • the tip of the one cutting lip may be arranged at a first radius which is different from a second radius of the tip of the other cutting lip. Provision may in particular be made for the first radius to be larger than the second radius by up to 90%, preferably by up to 60% and in particular by up to 30%. The applicant's tests in this respect demonstrate the tendency of material removal to become more intense as the difference between these two radii increases. It is advantageous for the tip of the one cutting lip to be arranged on the radially inner half of the cutting lip and that of the other cutting lip to be arranged on the radially outer half of the other cutting lip.
  • the carbide insert may advantageously be simply of plate-shaped configuration. It may be sintered as a blank in its basic shape, with the desired geometries thereof then being provided by post-machining.
  • the carbide insert may be adapted such that, in the installation position, it merges without transition, i.e. without projections, shoulders or the like which inhibit the conveying stream of particles to be carried away, into the associated conveyor spiral in the intended conveying direction.
  • an additional cut-away portion may be provided in a trailing position relative thereto in the drilling direction, which cut-away portion hollows out the underside of the carbide insert to such an extent that the cut-away portion merges without transition into the conveyor spiral.
  • FIGS. 1 and 1 a respectively show side views of a rock drill with a carbide insert according to FIG. 3 and an enlarged detail Ia according to FIG. 1 ,
  • FIGS. 2 and 2 a respectively show another side view of the rock drill according to FIG. 1 and an enlarged detail IIa according to FIG. 2 ,
  • FIGS. 3 a to 3 h each show a view of the carbide insert shown in FIGS. 1 and 2 ,
  • FIGS. 4 a to 4 d each show a view of a further embodiment of the carbide insert
  • FIGS. 5 a to 5 c each show a view of a further embodiment of the carbide insert
  • FIGS. 6 a and 6 b respectively show a view of a further embodiment of the carbide insert and an enlarged detail thereof
  • FIGS. 6 c and 6 d respectively show a view of a further embodiment of the carbide insert and an enlarged detail thereof
  • FIGS. 7 a to 7 e each show a view of a further embodiment of the carbide insert.
  • FIGS. 8 a to 8 e each show a view of a further embodiment of the carbide insert.
  • FIGS. 1 and 2 each show a side view of a rock drill 1 , which is configured as a non-percussively operating twist drill for drilling rock, rock-like material, hard plastics, glass or the like with a cylindrical drill body 11 and a working end 13 having a receptacle 12 , a plate-shaped carbide insert 2 according to the embodiments shown in FIGS. 4 a -4 e being brazed into the receptacle 12 .
  • FIGS. 3 and 5-8 show further embodiments of the carbide insert 2 in various views and in part with associated enlarged details.
  • the carbide insert 2 has cutting lips 22 which are radially opposite one another relative to an axis of drill rotation d and are arranged at an angle to one another to form a centering tip 21 .
  • Each cutting lip 22 has a conveyor spiral 14 associated with it, by which the cut material, not shown here, cut away by the carbide insert 22 is transported away contrary to drilling direction b. (In the figures, in the case of larger, curved side faces, additional lines with a smaller line thickness are drawn in which do not indicate a contour but rather a depth profile of these side faces.)
  • the cutting lips 22 are asymmetric to one another in all the embodiments of the carbide insert 22 , wherein at least one of the cutting lips 22 defines over its radial profile, in a central region spaced from its radial ends, a tip 23 projecting in the drilling direction b thereof.
  • the tip 23 represents a discontinuity in the radial profile of the cutting lips 22 .
  • a single projecting tip 23 where provided, is arranged in the cutting lip 22 .
  • the tip 23 projecting in the drilling direction b generates a transverse force during drilling, which forces the rock drill into transverse motion perpendicular to the drilling direction b and rotating with the drill, whereby the material at the bottom of the drilled hole is removed more quickly and moreover in the form of finer to floury grains, without percussive drilling being used.
  • the tip 23 extends over the entire cutting lip 22 and ends at a specific radius with its free end in an end point. The tip 23 thus rises over the entire cutting lip 22 from both radial sides to the free end point.
  • the tip 23 is defined radially inwardly and radially outwardly by free-running surfaces 24 of the cutting lip 22 .
  • the free-running surfaces 24 may here, as shown by way of example in FIGS. 1-4 and 7 , be uncurved side faces which slope away from the cutting edge 25 of the cutting lip 22 in each case at a specific wedge angle to the axis of drill rotation d contrary to drilling direction b.
  • the cutting lip 22 has a gable-like profile. In FIG.
  • the tip 23 thus takes the shape of a three-sided pyramid with the two free-running surfaces 24 and the side face 26 as side faces of said pyramid.
  • the proportions shown in the figures are however merely by way of example and it is not intended to limit the disclosure content of the invention thereto.
  • the free-running surfaces 24 defining the tip 23 may be concavely curved, as shown by way of example in FIGS. 5 and 8 .
  • FIG. 3 f in FIG. 5 a the profile of the cutting lip is shown in a side view perpendicular to the radial axial plane, which at the same time is the image plane of FIG. 5 a .
  • the profile is gable-like but with curved “gable sides”, i.e. with two concave arcs converging at the tip.
  • the exact profile is introduced using cylindrical grinding wheels, wherein the wedge angle is defined at the same time thereby.
  • a sharper tip 23 is produced, which is more aggressive in action but more susceptible to wear.
  • the tip 23 divides the cutting lips 22 into two radial portions, i.e. a radially outer portion a 1 and a radially inner portion a 2 , wherein the ratio of the length of the outer portion a 1 to that of the inner portion a 2 here amounts to around 1.5.
  • those in FIGS. 7 and 8 have just one tip 33 in leading position in the direction of drill rotation r on each of the two cutting lips 32 , wherein the tips 33 are however arranged at different radii, i.e., as shown in FIG. 7 a , the left-hand tip 33 is arranged at a first radius r 1 and the right-hand tip 33 at a second radius r 2 , wherein the first radius r 1 is here about half as large as the second radius r 2 .
  • the tip 33 on the right hand due to its greater radial lever (r 2 ), thus causes a greater transverse force to be generated than the left-hand tip 33 .
  • the centering tip 21 is axially symmetrically tapered relative to the axis of drill rotation d.
  • a first flute-like recess 271 in a leading position relative to the cutting edge 25 of the cutting lips 22 in the direction of drill rotation r and extending to the associated conveyor spiral 14 of the respective cutting lip 22 is provided radially inwardly for each cutting lip 22 .
  • the first recess 271 is introduced into the carbide insert 2 , forming an inner region and thus parallel to this inner region.
  • the cutting lip 22 is thus extended into the centering tip 21 and it is moreover ensured that cut-off material may be discharged from the centering tip 21 into the respective conveyor spiral.
  • the first recess 271 is arranged inclined at an angle of attack ⁇ to the axis of drill rotation d.
  • the two cutting lips 22 extend radially inwards, forming a transverse lip 28 , wherein they are radially spaced by way of the transverse lip 28 , depending on the size of the angle of attack ⁇ .
  • FIGS. 3 a , 6 a and 6 c show that, the greater the angle of attack ⁇ or the further the first recesses 271 extend relative to the axis of drill rotation d, the smaller is the transverse lip 28 .
  • the inclination of the first recess 271 may thus be used purposefully to adjust the size of the transverse lip 28 and thus also the radial thickness of the centering tip 21 .
  • the first flute-like recess 271 forms the radially inner region 221 of the one cutting lip 22 and a radially inner region 241 of a free-running edge 242 defining the free-running surface 24 of the other cutting lips 22 .
  • the centering angle ⁇ amounts to around 120° and is thus suitable in particular for drilling floor tiles, thermosets, hard composites and the like.
  • a second recess 272 is provided radially outwardly and extending to the cutting edge 25 for further improved removal of cut material, said second recess extending towards the respectively associated conveyor spiral 14 contrary to the drilling direction b.
  • the two recesses 271 , 272 of a cutting lip 22 adjoin one another, forming a discontinuity in the radial profile of the associated cutting lips 22 which likewise contributes to comminution of the cut material.
  • the radial point P at which the two recesses 271 , 272 adjoin one another radially is different from the point at which the tip 23 ends at its free end.
  • a cut-away portion 29 is provided (in particular in FIGS. 1, 1 a , 2 and 2 a and in the views from below according to FIGS. 3 e and 4 e ) axially in the drilling direction b in a trailing position relative to the cutting lip 22 , wherein that cut-away portion merges into the associated conveyor spiral virtually without transition contrary to the drilling direction b, i.e. without any side face pointing in the drilling direction b and projecting away into the convey spiral 14 for transporting the material away. That is to say, in the embodiments of the carbide insert 2 shown here, all that has been provided is an offset which is harmless to material flow at the point of transition of the carbide insert 2 into the conveyor spiral 14 .
  • a second recess 272 Insofar as a second recess 272 is provided, same conveys the cut material contrary to drilling direction b into the associated cut-away portion 29 .
  • the first recess 271 guides the cut material into the associated second recess 272 and radially inwards directly into the associated cut-away portion 29 . Comprehensive removal of the cut material into the associated conveyor spiral 14 is thus made possible.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Earth Drilling (AREA)
US15/772,776 2015-11-02 2016-11-02 Hartmetalleinsatz und Gesteinsbohrer Abandoned US20190234150A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102015118689.6 2015-11-02
DE102015118689.6A DE102015118689A1 (de) 2015-11-02 2015-11-02 Hartmetalleinsatz und Gesteinsbohrer
PCT/EP2016/076378 WO2017076875A1 (fr) 2015-11-02 2016-11-02 Insert en métal dur et foret à roche

Publications (1)

Publication Number Publication Date
US20190234150A1 true US20190234150A1 (en) 2019-08-01

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US15/772,776 Abandoned US20190234150A1 (en) 2015-11-02 2016-11-02 Hartmetalleinsatz und Gesteinsbohrer

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US (1) US20190234150A1 (fr)
EP (1) EP3370904A1 (fr)
DE (1) DE102015118689A1 (fr)
WO (1) WO2017076875A1 (fr)

Cited By (7)

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Publication number Priority date Publication date Assignee Title
USD878438S1 (en) * 2018-08-06 2020-03-17 Peter L. Bono Helical fluted forward and reverse rotation cutting tool
USD878437S1 (en) * 2018-08-06 2020-03-17 Peter L. Bono Helical fluted forward and reverse rotation cutting tool
USD881957S1 (en) * 2019-06-27 2020-04-21 Hongjia Wang Twist drill
USD892326S1 (en) * 2018-01-31 2020-08-04 Beijing Smtp Technology Co., Ltd. Ultrasonic cutter head
USD894978S1 (en) * 2018-08-07 2020-09-01 Sumitomo Electric Hardmetal Corp. Drill bit
USD940080S1 (en) * 2020-02-28 2022-01-04 Surmodics, Inc. Helical strain relief device
USD958856S1 (en) * 2020-05-21 2022-07-26 Korloy Inc. Drill bit

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US4984944A (en) * 1987-02-09 1991-01-15 Vermont American Corporation Drill bit blade for masonry and rock drill

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US5269387A (en) * 1992-02-27 1993-12-14 Tungco, Incorporated Insert for mine roof tool bit
US5829540A (en) * 1993-07-28 1998-11-03 Sandvik Rock Tools, Inc. Mine roof drill bit and cutting insert therefor
DE29922291U1 (de) * 1999-12-20 2000-02-24 Drebo Werkzeugfab Gmbh Bohrer
DE50304839D1 (de) * 2002-12-19 2006-10-12 Bosch Gmbh Robert Gesteinsbohrer
DE102007050050A1 (de) * 2007-10-17 2009-04-23 Kennametal Inc. Rundlaufwerkzeug, insbesondere Bohrer
DE202011100380U1 (de) * 2011-05-06 2012-08-07 Illinois Tool Works Inc. Gesteinsbohrer
DE102012218702A1 (de) * 2012-10-15 2014-04-17 Robert Bosch Gmbh Gesteinsbohrer

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Publication number Priority date Publication date Assignee Title
US4568227A (en) * 1983-06-20 1986-02-04 Hogg Donald L Asymmetrical drill bit
US4984944A (en) * 1987-02-09 1991-01-15 Vermont American Corporation Drill bit blade for masonry and rock drill

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD892326S1 (en) * 2018-01-31 2020-08-04 Beijing Smtp Technology Co., Ltd. Ultrasonic cutter head
USD878438S1 (en) * 2018-08-06 2020-03-17 Peter L. Bono Helical fluted forward and reverse rotation cutting tool
USD878437S1 (en) * 2018-08-06 2020-03-17 Peter L. Bono Helical fluted forward and reverse rotation cutting tool
USD894978S1 (en) * 2018-08-07 2020-09-01 Sumitomo Electric Hardmetal Corp. Drill bit
USD881957S1 (en) * 2019-06-27 2020-04-21 Hongjia Wang Twist drill
USD940080S1 (en) * 2020-02-28 2022-01-04 Surmodics, Inc. Helical strain relief device
USD958856S1 (en) * 2020-05-21 2022-07-26 Korloy Inc. Drill bit

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Publication number Publication date
DE102015118689A1 (de) 2017-05-04
WO2017076875A1 (fr) 2017-05-11
EP3370904A1 (fr) 2018-09-12

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