EP0864723A1 - Boring bit and boring casing - Google Patents

Boring bit and boring casing Download PDF

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Publication number
EP0864723A1
EP0864723A1 EP97304951A EP97304951A EP0864723A1 EP 0864723 A1 EP0864723 A1 EP 0864723A1 EP 97304951 A EP97304951 A EP 97304951A EP 97304951 A EP97304951 A EP 97304951A EP 0864723 A1 EP0864723 A1 EP 0864723A1
Authority
EP
European Patent Office
Prior art keywords
boring
cutter
shank
bit
main body
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.)
Ceased
Application number
EP97304951A
Other languages
German (de)
English (en)
French (fr)
Inventor
Akira Suzuki
Takahiko Kabutomori
Kinkou Amano
Shouji Eguti
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.)
Tone Geo TECH Co Ltd
Original Assignee
Tone Geo TECH Co Ltd
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 Tone Geo TECH Co Ltd filed Critical Tone Geo TECH Co Ltd
Publication of EP0864723A1 publication Critical patent/EP0864723A1/en
Ceased 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
    • E21B10/02—Core bits

Definitions

  • the present invention relates to a boring bit which is mounted on boring machines such as auger boring machines, all casing boring machines or multiaxial boring machines and in particular to a boring bit and a boring casing using the same for boring mainly hard rock such as large gravel, cobble stone to achieve extension of service life as well as enhancement of the boring efficiency.
  • auger and all casing methods are expected to be feasible.
  • the auger methods are mainly classified into earth auger method in which boring is conducted by rotating in a given direction an auger screw 50 (shown in Fig. 5) on which bits 51 made of cemented carbide are mounted at its tip end; a donut auger method in which a casing 52 on which bits 53 are mounted on its tip end is disposed around the auger screw 50 as shown in Fig.
  • the boring bit 55 which is mounted on the auger screw 50 and casing 52 at the tip end thereof comprises a chip 57 which is buried in a shank 56 as shown in Fig. 8.
  • the bits 55 are mounted on the auger screw 50 or casing 52 at the tip end thereof by means of welding or bolts.
  • the present Invention provides a boring bit mounted on a ground boring machine, comprising a cutter which is brought into contact with the face of the ground to be bored for substantially conducting crushing of the groun d and a shank for holding said cutter, said cutter being held at the distal end of said shank so that it is rotatable around its rotation axis.
  • said cutter may be preferably provided within the shank in such a manner that only its boring blade projects outwardly beyond the distal end of the shank.
  • Said cutter may preferably comprise a disc-shaped cutter main body and journals which are integrally formed with the opposite sides of the cutter main body.
  • the boring bit may further include a blade having a wedge-shaped section, which is integral with the outer periphery of said disc shaped cutter main body.
  • the boring blade of said cutter may comprise a plurality of buried blades which are buried in the outer periphery of said disk shaped cutter main body at a given space. Since in the this case, only the blade which is buried in the cutter main body is required to replace if the blade is worn, working efficiency can be enhanced.
  • the range in which the present invention can be applied is not particularly limited. Since line cutting is carried out along the cutter locus, the present invention is most preferably applied to a boring casing in which cutting is carried along the circular contour of the tube wall.
  • the boring bits which are mounted on ground boring machine such as auger, all casing and multiaxial boring machines always comprise chips which are buried in the tip end of a billet type shank.
  • the cutter at the tip end of a shank in this type of boring bit comprises a rotary blade to provide an extended life time of the bit.
  • wear of the bit is very high since high shearing forces, bending moments and/or frictional forces are always applied to the chip.
  • the blade is contact with the face of ground to be bored while being rotated due to the fact that the blade is rotatable. Therefore, the wear is remarkably reduced, achieving the enhancement in boring efficiency.
  • FIG. 1 there is shown a manner of boring which is conducted by a peripheral full rotation all casing method.
  • the present invention may be preferably applied to the bit 2.
  • each of the bits 2 mainly comprises a rotary cutter 24 which is in contact with the boring face for substantially crushing it and a shank 20 which is a member for rotatably holding the rotary cutter 24 and for mounting the cutter 24 on the casing 1.
  • the shank 20 has a slit groove 21 extending in its longitudinal direction on the base side thereof, which is defined between two opposing bracket pieces 22A and 22B.
  • a bolt hole 22a is formed through two bracket pieces 22A, 22B.
  • the bracket pieces 22A, 22B are fitted into notches 1a which are formed on the inner and outer sides of the tip end portion of the casing 1. Then, the shank 20 is firmly secured to the casing 1 by fastening a bolt (not shown) which is inserted into the bolt hole 22a.
  • the bits 2 may be secured to the tip end of the casing 1 by welding and the like.
  • the bit 2 is formed on the distal end side thereof with an opening 23e through which a blade 24a of a rotary cutter 24 extends outwardly.
  • the bit 2 is further formed on more inner side thereof with a bearing space 23 which is in communication with the opening 23c and is also formed in more inner position thereof with a blade space 23b which is in communication with the space 23.
  • the bearing space 23 enables the rotary cutter 24 to be rotatably born.
  • the rotary cutter 24 is provided within the shank 20 in such a manner that the boring blade 24a projects externally beyond the distal end of the shank 2.
  • the rotary cutter 24 comprises a cutter main body 24A which is in the form of disc and journals 24B which are formed on and integrally with the both sides of the cutter main body 24A.
  • the bearing which defines the bearing space 23 is formed on the inner surface thereof with convex ribs 23a having a semi-circular section extending in a peripheral direction.
  • the journals are formed with recesses 24b having a semi-circular section. Mating of the ribs 23a into the recesses 24b enables the rotary cutter 2 to be rotatably born on the bearing at a less rotational friction. Suitable lubricants such as solid or liquid lubricant may be used.
  • the blade structure of the cutter main body 24A of the rotary cutter 24 may include a peripherally extending tip 25 having a wedge-shaped section, which is integrally buried in the outer periphery of the cutter main body 24A as shown in Fig. 3 or may include buried blades 26 having their base portions in holes 24 which are spacedly formed along the outer periphery of the cutter main body 24A as shown in Fig. 4.
  • the chip shape of the buried blade 26 may be semi-spherical as shown in the drawing, chisel-shaped, bulletin-shaped, or double cone-shaped. These chips are changed depending upon the rocks to be bored.
  • the boring bit of the present invention has a high wear resistance of the chip in comparison with the prior art and achieves the extension of the service life of the bit even if it is used for boring of hard rock layer including large gravel and cobble stone, resulting in an enhanced boring efficiency.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
EP97304951A 1997-03-11 1997-07-07 Boring bit and boring casing Ceased EP0864723A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP55960/97 1997-03-11
JP5596097A JPH10252372A (ja) 1997-03-11 1997-03-11 掘削用ビットおよびこれを用いた掘削用ケーシング

Publications (1)

Publication Number Publication Date
EP0864723A1 true EP0864723A1 (en) 1998-09-16

Family

ID=13013657

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97304951A Ceased EP0864723A1 (en) 1997-03-11 1997-07-07 Boring bit and boring casing

Country Status (2)

Country Link
EP (1) EP0864723A1 (ja)
JP (1) JPH10252372A (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022129091A1 (de) 2022-11-03 2024-05-08 Heller Tools Gmbh Bohrkrone für einen dreh-hämmernden oder dreh-schlagenden Einsatz zum Durchtrennen von Armierungseisen in Beton

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE515294C2 (sv) * 1999-11-25 2001-07-09 Sandvik Ab Bergborrkrona och stift för slående borrning samt metod att tillverka en bergborrkrona för slående borrning

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1717271A (en) * 1928-05-29 1929-06-11 Richard P Simmons Well-drilling apparatus
US3830321A (en) * 1973-02-20 1974-08-20 Kennametal Inc Excavating tool and a bit for use therewith
JPH03183892A (ja) * 1989-12-12 1991-08-09 Mitsubishi Heavy Ind Ltd コアカツタ
DE4301191A1 (de) * 1993-01-19 1994-07-21 Hawera Probst Kg Hartmetall Gesteinsbohrwerkzeug

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1717271A (en) * 1928-05-29 1929-06-11 Richard P Simmons Well-drilling apparatus
US3830321A (en) * 1973-02-20 1974-08-20 Kennametal Inc Excavating tool and a bit for use therewith
JPH03183892A (ja) * 1989-12-12 1991-08-09 Mitsubishi Heavy Ind Ltd コアカツタ
DE4301191A1 (de) * 1993-01-19 1994-07-21 Hawera Probst Kg Hartmetall Gesteinsbohrwerkzeug

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 437 (M - 1176) 7 November 1991 (1991-11-07) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022129091A1 (de) 2022-11-03 2024-05-08 Heller Tools Gmbh Bohrkrone für einen dreh-hämmernden oder dreh-schlagenden Einsatz zum Durchtrennen von Armierungseisen in Beton

Also Published As

Publication number Publication date
JPH10252372A (ja) 1998-09-22

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