US20030230926A1 - Rotating cutter bit assembly having hardfaced block and wear washer - Google Patents

Rotating cutter bit assembly having hardfaced block and wear washer Download PDF

Info

Publication number
US20030230926A1
US20030230926A1 US10444539 US44453903A US2003230926A1 US 20030230926 A1 US20030230926 A1 US 20030230926A1 US 10444539 US10444539 US 10444539 US 44453903 A US44453903 A US 44453903A US 2003230926 A1 US2003230926 A1 US 2003230926A1
Authority
US
Grant status
Application
Patent type
Prior art keywords
bit
bit holder
cutter
block assembly
assembly according
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
US10444539
Inventor
Michael Mondy
Kirk Webb
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.)
Kennametal Inc
Original Assignee
Kennametal Inc
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

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C35/00Miscellaneous items relating to machines for slitting or completely freeing the mineral from the seam
    • E21C35/18Mining picks; Holders therefor
    • E21C35/183Mining picks; Holders therefor with inserts or layers of wear-resistant material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28DWORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B28D1/186Tools therefor, e.g. having exchangeable cutter bits
    • B28D1/188Tools therefor, e.g. having exchangeable cutter bits with exchangeable cutter bits or cutter segments

Abstract

A rotatable cutting bit, and rotatable cutting bit-bit holder assembly and washer that have increased wear resistance characteristics. The assembly incorporates a new holding washer design that has improved wear resistant characteristics between the cutter bit and top surface of the bit holder during operation. The cutter bit assembly includes a bit holder having a top surface, a generally flat washer, the top surface includes a top face forming a bearing surface for the cutting bit to enhance rotation of the cutter bit. The wear rate caused by the relative rotation between the rear face of the washer and top surface of the block face is reduced in the present invention. The top surface of the bit holder is hardfaced to limit and reduce wear. The improved wear resistance properties of the invention reduce the amount of necessary maintenance of rotary drums in the field resulting in reduce downtime and increase productivity.

Description

  • This application is a nonprovisional application of U.S. Provisional Application No. 60/385,683, filed Jun. 4, 2002.[0001]
  • BACKGROUND OF THE INVENTION FIELD OF THE INVENTION
  • This invention relates to an article for improving the efficiency of operation of carbide-tipped cutting bits utilized in rotary machines adapted for pulverizing concrete and asphalt roadways and similar surfaces. More particularly, the invention relates to articles for improving the cutting action of rotatable carbide bits, and for protecting the support blocks in which the bits are mounted. [0002]
  • In the prior art, cutting bits are mounted to be rotatable about the central axis of the cutting bit mounted in a support block. The rotation of the cutting bit provides for uniform wear of the cutting bit improving the effective life of the cutting tool. The rotatable cutting bits have a flange bottom face that bears against the top face of the support block. [0003]
  • During the operation of prior art cutting bits, the support block experienced wear due to the contact between the cutting bit and the support block, as well as the impingement of the debris from the cutting operation. While the cutting bit was replaced on a periodic basis after the expiration of the useful life thereof, the support block was typically intended to be functional much longer than the cutting bit. As the bore and front face of the support block became worn, the support block lost its effectiveness due to deformation and wear of the bore and the front face thereof. In the case of the bore, it lost its initial cylindrical shape by becoming out-of-round, oversized or bell-mouthed at its opening. In the case of the front face of the support block, it lost its flatness. Each one of these conditions impeded the satisfactory rotation of the cutting bit in the support block. [0004]
  • Although providing the capability for free rotation of the cutting-bit results in more uniform wear and extended life of the bit, wear of the bit support block continues to be a problem. The flat, upper transverse face of the bit support block is continuously impacted with abrasive materials during the operation of the rotary drum pulverizers or wheel machines. Also, if a bit wears down to the extent that it extends only a short distance out from the face of its support block, more rapid and destructive wear of the support block occurs. Excessively worn bit-support blocks must be removed from the pulverizer drum or wheel with a cutting torch, and a new support block welded onto the drum or wheel. This replacement process is time consuming, and therefore, costly. Furthermore, it frequently happens that replacement of support blocks under field conditions results in a misalignment of the bore axis of the holding support block from its optimum orientation, decreasing the effectiveness of machine operation. [0005]
  • Efforts have been made in the industry to alleviate the wear problems discussed above. In the prior art, bearing washers, such as U.S. Pat. No. 4,818,027, are comprised essentially of a flat, hardened steel annular ring or washer which is adapted to fitting between the enlarged base of a cylindrical cutting bit, and the transverse outer face of the holding block which rotatably supports the bit. In addition to absorbing wear, which would otherwise be experienced by the bit holding block, this bearing washer provided other advantages. One advantage is the reduction of cutting bit friction; the bearing washer was free to rotate allowing the cutting bit to rotate more freely. This results in cooler operation and more even wear of the cutting bit, substantially extending its life. [0006]
  • Although providing the capability for free rotation of the cutting bit results in more uniform wear and extended life of the bit, wear of the bit holding block in prior art continued to be a problem. The flat, upper face of the bit holding block is continuously impacted with abrasive materials during the operation of the rotary pulverizers. Wear in such prior art designs also occurred on account of relative rotation between the bearing washer and face of the holding block. It should be noted that the rate of wear to the holding block due to the bearing washer was much less than the rate of wear caused by a rotating cutting bit without a bearing washer. Wear of the bit holding block requires that the worn blocks be removed from the pulverizer drum with a cutting torch, and a new block welded onto the drum. This is a time consuming, and therefore, costly operation. Furthermore, it frequently happens that replacement of holding blocks under field conditions results in a misalignment of the bore axis of the mounting block from its optimum orientation. [0007]
  • Other efforts have been made to reduce the undesirable wear that occurred on the top face of the support block. U.S. Pat. No. 5,931,542, to Britzke et al., discloses a method of protecting the front face of a cutter bit holder block. Britzke '542 illustrates a thrust-bearing washer at [0008] 50. The washer is keyed with sleeve 42 so as to be fixed in position. Accordingly no wear occurs between the washer and top face of the bit holder block. The cutting bit on this prior art design did not rotate as freely as cutting bits having bearing washers that were also free to rotate as discussed above.
  • The Ojanen U.S. Pat. No. 5,251,964 discloses an attempt in the prior art to protect the face of a block wherein a plurality of carbide inserts are brazed to the face of the block to limit the rate of wear to the front face of the block. This design was ineffective because the cutter bits are made from hardened steel in order to limit wear to the tool during use. The bottom face of the cutter bit shoulder in contact with the top face of the support block is made from such hardened steel. The contact of prior art cutter bit hardened steel against the top face of the support block shaved and fractured the plurality of carbide inserts. [0009]
  • It would, therefore, be very advantageous to provide a cutting bit, which, during operation, protects the bore of the bit holder, as well as the front face of the support block, from deformation. By providing this protection, a cutting bit would help prolong the useful life of the support block, as well as, help the rotation of the cutting bit. [0010]
  • OBJECTS OF THE INVENTION
  • An object of the present invention is to provide an efficient means for protecting holding support blocks, of the type used to hold rotating cutting bits used in a pulverizer and rotary drum or wheel machines, from excessive abrasion and impact damage. [0011]
  • Another object of the invention is to provide a cutter block assembly which has both great hardness for providing high abrasion resistance and high impact strength to limit damage to a support mounting block. [0012]
  • Another object of the invention is to provide a combination of elements for cutter bit holding block assemblies which is free to rotate with respect to the shank of the cutting bit providing uniform wear of the cutting bits. [0013]
  • Various other objects and advantages of the present invention, and its most novel features, will become apparent to those skilled in the art by perusing the accompanying specification, drawings and claims.[0014]
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a side view of the cutter block assembly of the present invention. [0015]
  • FIG. 2 is a front view of the block for the present invention. [0016]
  • FIG. 3 is a side view of the cutting bit assembly of the present invention.[0017]
  • DESCRIPTION OF THE INVENTION
  • The cutter block assembly [0018] 10 of the present invention is illustrated in FIG. 1. The cutter block assembly 10 includes a holder block 12 and a rotatable cutter bit 14 fixed therein. As best seen in FIG. 2, the top face 11 of the block has a hardfacing material deposited thereon represented by the speckled/shaded grit.
  • The cutter bit assembly is best shown in FIG. 3. The cutter bit assembly includes a cutter body having an integral conical head [0019] 18 and shaft 24, cutting tip 16, a retainer 22 and a bearing washer 20. The cutter bit assembly 14 is first inserted and manually knocked into the bore 15 of the holder block, typically with a hammer. The retainer sleeve 22 is made from Spring Steel that is held in a compressed loaded position by the holding washer 20 as shown in FIG. 3. In the compressed loaded position the external diameter of the sleeve is less than the internal diameter of the bore. When the cutter bit assembly 14 is hammered into the bore 15 of the holder block the bearing washer 20 moves upward toward the conical head 18 above the retainer sleeve 22 releasing the retainer sleeve so that it tensions against the interior of the bore holding the shaft inside the bore. U.S. Pat. No. 4,818,027 is hereby incorporated by reference in its entirety.
  • The holder block of the present invention is constructed from a steel alloy heat treated to a Rockwell hardness number of between 45-55 Rockwell “C”. In one embodiment, the steel alloy is constructed from AISI 8740 heat treated to Rockwell Hardness of between 45-50 RHc. The composition of AISI steel is 0.40 Carbon, 0.75-1.1 Manganese, 0.4-0.7 Nickel, 0.4-0.6 Nickel, 0.4-0.6 Chromium, 0.2-0.3 Molybdenum and 0.2-0.35 Silicon. It is contemplated that the steel alloy might be made of another or other suitable steel alloy having the same general desirable wear characteristics of AISI 8740, 4140, 1020, and 4030. [0020]
  • The hardfacing could be applied to the block with a well-known torch having a hopper for feeding powder into combustible gases discharged from the torch nozzle to melt the powder to form a metallurgical bond with the block. Alternatively, the hardfacing could be applied by an electroplasma gun or other suitable means well known in the art for depositing metal powder onto a metal body. A suitable powder torch for applying hardfacing is disclosed in U.S. Pat. No. 3,995,811. The depth of the coating applied onto the top face of the block is between {fraction (1/16)}″-{fraction (3/32)}″. [0021]
  • In one embodiment the hardfacing material is a composition of nickel metal, iron-nickel and has a Rockwell Hardness “C” value of between 57-63. A suitable powder for hardfacing the support block of the present invention has a particle size of 32 microns and a percent weight composition as follows: Silicon: 0.75%-5.0%, Chromium: 8.0%-15%, Iron: 2.0%-5.0%, Nickel: 68%-78%, Carbon: 0.0%-1.5%, and Boron: 1.00%-5.00% %. In one embodiment the hardfacing composition is about 75.7% Nickel, about 3.8% Iron, about 3.6 % Silicon, about 2.35% Boron, about 10.8% Chromium, and the remainder a variety of impurities. Another contemplated powder composition is 78% Nickel, 11.7 % Chromium, 4.1% Iron, 0.9% silicon and 0.5% tungsten. [0022]
  • The holding washer is made from typical Spring Steel employed and well known in the industry, including but not limited to AISI 1060, 1070 & 1080 steel. The holding washer may or may not be heat-treated, but is a softer material than the material used to make the cutter bit. A Rockwell hardness value between 43-48 can provide for satisfactory results in some environments, whereas different Rockwell hardness values of the Spring Steel are more suitable for other environments. It is believed that the cooperation of the holding washer's softer material with the top face of the support block is less destructive to the top face of the block than direct rotational contact between the harder surface of the cutter bit and the top face of the support block. [0023]
  • The cutter tip [0024] 16 is typically made from a cemented carbide material such as, for example, a cobalt-tungsten carbide alloy. Although the specific grade of cemented carbide depends upon the particular application for the cutting tool, rotatable cutting tools used in road planing applications may use a hard insert made of cobalt cemented tungsten carbide wherein the cobalt content ranges between about 5 weight percent to 13 weight percent, with the balance comprising tungsten carbide. The hardness of the cemented tungsten carbide may range between about 86 and about 90.4 Rockwell A. A preferred grade of cemented tungsten carbide for a road planing application has a cobalt content that ranges between about 5.2 weight percent and about 6.3 weight percent, with the balance being essentially tungsten carbide and the hardness ranging between 88.2 and 89.4 Rockwell A.
  • The shape and sizes of the cutter bit, holding washer and mounting support block are merely a representative cutter bit assembly to help present the invention, and are not intended to limit the scope of application of the present invention. The novel features of this invention and the invention itself, both in structure and operation, are best understood from the accompanying drawings considered in connection with the accompanying description. It should be noted that the illustrated embodiments and corresponding description are merely one of many designs for the invention and merely representative. The invention is not intended to be limited to the disclosed embodiments and description herein. [0025]

Claims (20)

What is claimed is:
1. A cutter block assembly for use in mining, road working or earth moving comprising:
a bit holder block having a top surface,
a cutting tool, and
a washer between said cutting tool and bit holder block for reducing wear between the cutting tool and said bit holder block,
wherein said top surface has a hardface coating.
2. The cutter block assembly according to claim 1 wherein said cutting tool is rotatable.
3. The cutter block assembly according to claim 2 wherein said bit holder block is constructed from a steel alloy.
4. The cutter block assembly according to claim 3 wherein said steel alloy has a Rockwell “C” hardness number between 45-55 Rc.
5. The cutter block assembly according to claim 3 wherein said hardface coating has a Rockwell “C” hardness number between 57-63 Rc.
6. The cutter block assembly according to claim 4 wherein said hardface coating has a Rockwell “C” hardness number between 57-63 Rc.
7. The cutter block assembly according to claim 6 wherein said washer has a Rockwell “C” hardness number between 43-48 Rc.
8. The cutter block assembly according to claim 1 wherein said coating has a depth of between {fraction (1/16)}″-{fraction (3/32)}″.
9. The cutter block assembly according to claim 8 wherein said hardface coating has a Rockwell “C” hardness number between 57-63 Rc.
10. The cutter block assembly according to claim 3 wherein said hardface coating comprises Silicon, Chromium, Iron, Boron and Nickel.
11. The cutter block assembly according to claim 1 wherein said hardface coating comprises by percent weight composition:
0.75%-5.0% Silicon,
8.0-15.0% Chromium,
2.0%-5.0% Iron,
1.0%-5.0% Boron, and
68%-78% Nickel.
12. The cutter block assembly according to claim 11 wherein said hardface coating has a Rockwell hardness value between 57-63 Rc.
13. The cutter block assembly according to claim 11 wherein said Silicon is about 3.6%, said Chromium is about 10.8%, said Iron is about 3.8%, said Boron is about 2.35% and said Nickel is about 75.7%.
14. The cutter block assembly according to claim 1 wherein said hardface coating comprises by percent weight composition:
about 78% Nickel,
about 11.7% Chromium,
about 4.1% Iron,
about 0.9% Silicon,
about 0.5% Tungsten, and
having a hardness value between 57-63 Rc.
15. A bit holder for a rotating cutter bit for use in mining, road working or earth moving comprising:
a top surface having a hardface coating, wherein said coating has a Rockwell “C” hardness number between 57-63 Rc.
16. The bit holder according to claim 15 wherein said bit holder block is manufactured from a steel alloy.
17. The bit holder according to claim 16 wherein said steel alloy has a Rockwell “C” hardness number between 45-55 Rc.
18. The bit holder according to claim 15 wherein said hardface coating comprises Silicon, Chromium, Iron, Boron and Nickel.
19. The bit holder according to claim 15 wherein said hardface coating comprises by percent weight composition:
0.75%-5.0% Silicon,
8.0-15.0% Chromium,
2.0%-5.0% Iron,
1.0%-5.0% Boron, and
68.0%-78.0% Nickel.
20. The bit holder according to claim 15 wherein said hardface coating comprises by percent weight composition:
about 78.0% Nickel,
about 11.7% Chromium,
about 4.1% Iron,
about 0.9% Silicon,
about 0.5% Tungsten, and
having a hardness value between 57-63 Rc.
US10444539 2003-05-23 2003-05-23 Rotating cutter bit assembly having hardfaced block and wear washer Abandoned US20030230926A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10444539 US20030230926A1 (en) 2003-05-23 2003-05-23 Rotating cutter bit assembly having hardfaced block and wear washer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10444539 US20030230926A1 (en) 2003-05-23 2003-05-23 Rotating cutter bit assembly having hardfaced block and wear washer

Publications (1)

Publication Number Publication Date
US20030230926A1 true true US20030230926A1 (en) 2003-12-18

Family

ID=29739873

Family Applications (1)

Application Number Title Priority Date Filing Date
US10444539 Abandoned US20030230926A1 (en) 2003-05-23 2003-05-23 Rotating cutter bit assembly having hardfaced block and wear washer

Country Status (1)

Country Link
US (1) US20030230926A1 (en)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080036280A1 (en) * 2006-08-11 2008-02-14 Hall David R Pick Assembly
US20080067859A1 (en) * 2006-08-11 2008-03-20 Hall David R Shank Assembly
US20080115978A1 (en) * 2006-08-11 2008-05-22 Hall David R Shank Assembly with a Tensioned Element
US20080164748A1 (en) * 2006-08-11 2008-07-10 Hall David R Degradation Assembly
US7600823B2 (en) * 2006-08-11 2009-10-13 Hall David R Pick assembly
US20100109418A1 (en) * 2008-11-05 2010-05-06 Alex Greenspan Mining and Demolition tool
US7946656B2 (en) 2006-08-11 2011-05-24 Schlumberger Technology Corporation Retention system
US7976238B2 (en) 2006-12-01 2011-07-12 Hall David R End of a moldboard positioned proximate a milling drum
US7992945B2 (en) 2006-08-11 2011-08-09 Schlumberger Technology Corporation Hollow pick shank
US7997661B2 (en) 2006-08-11 2011-08-16 Schlumberger Technology Corporation Tapered bore in a pick
US8033615B2 (en) 2006-08-11 2011-10-11 Schlumberger Technology Corporation Retention system
US8033616B2 (en) 2006-08-11 2011-10-11 Schlumberger Technology Corporation Braze thickness control
US8061784B2 (en) 2006-08-11 2011-11-22 Schlumberger Technology Corporation Retention system
US8201892B2 (en) 2006-08-11 2012-06-19 Hall David R Holder assembly
US8250786B2 (en) 2010-06-30 2012-08-28 Hall David R Measuring mechanism in a bore hole of a pointed cutting element
US8262168B2 (en) 2010-09-22 2012-09-11 Hall David R Multiple milling drums secured to the underside of a single milling machine
US8292372B2 (en) 2007-12-21 2012-10-23 Hall David R Retention for holder shank
US8322796B2 (en) 2009-04-16 2012-12-04 Schlumberger Technology Corporation Seal with contact element for pick shield
US8342611B2 (en) 2007-05-15 2013-01-01 Schlumberger Technology Corporation Spring loaded pick
CN102900012A (en) * 2011-07-25 2013-01-30 钴碳化钨硬质合金公司 Cutting tool assembly with protective member
US8403595B2 (en) 2006-12-01 2013-03-26 David R. Hall Plurality of liquid jet nozzles and a blower mechanism that are directed into a milling chamber
US8449040B2 (en) 2006-08-11 2013-05-28 David R. Hall Shank for an attack tool
US8485756B2 (en) 2006-12-01 2013-07-16 David R. Hall Heated liquid nozzles incorporated into a moldboard
US8500209B2 (en) 2006-08-11 2013-08-06 Schlumberger Technology Corporation Manually rotatable tool
US8636325B2 (en) 2008-11-05 2014-01-28 Gregory Greenspan Mining and demolition tool
US8701799B2 (en) 2009-04-29 2014-04-22 Schlumberger Technology Corporation Drill bit cutter pocket restitution
US9051795B2 (en) 2006-08-11 2015-06-09 Schlumberger Technology Corporation Downhole drill bit
US20170343113A1 (en) * 2011-01-17 2017-11-30 Hamilton Sundstrand Corporation Thrust plate for butterfly valve
US9915102B2 (en) 2006-08-11 2018-03-13 Schlumberger Technology Corporation Pointed working ends on a bit
US10029391B2 (en) 2006-10-26 2018-07-24 Schlumberger Technology Corporation High impact resistant tool with an apex width between a first and second transitions

Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995811A (en) * 1975-05-22 1976-12-07 Eutectic Corporation Nozzle for depositing metal powder by spraying
US4201421A (en) * 1978-09-20 1980-05-06 Besten Leroy E Den Mining machine bit and mounting thereof
US4268089A (en) * 1978-05-31 1981-05-19 Winster Mining Limited Mounting means for pick on mining drum vane
US4290555A (en) * 1979-02-21 1981-09-22 Nippon Sanso K. K. Method for supplying powder to be used in home spray coating operation
US4420459A (en) * 1980-10-20 1983-12-13 Gte Products Corporation Method of making preforms for brazing and hardfacing
US4660890A (en) * 1985-08-06 1987-04-28 Mills Ronald D Rotatable cutting bit shield
US4725098A (en) * 1986-12-19 1988-02-16 Kennametal Inc. Erosion resistant cutting bit with hardfacing
US4759505A (en) * 1985-10-22 1988-07-26 Castolin S.A. Flame spray torch for the manufacturing of surface layers on workpieces
US4901921A (en) * 1986-04-25 1990-02-20 Canadian Patents And Development Limited Particle injection device for thermal spraying
US4932723A (en) * 1989-06-29 1990-06-12 Mills Ronald D Cutting-bit holding support block shield
US4944559A (en) * 1988-06-02 1990-07-31 Societe Industrielle De Combustible Nucleaire Tool for a mine working machine comprising a diamond-charged abrasive component
US5251964A (en) * 1992-08-03 1993-10-12 Gte Valenite Corporation Cutting bit mount having carbide inserts and method for mounting the same
US5816324A (en) * 1996-05-03 1998-10-06 Smith International, Inc. Whipstock accelerator ramp
US5879743A (en) * 1996-08-28 1999-03-09 Deere & Company Method for hardfacing a metal surface
US6124564A (en) * 1998-01-23 2000-09-26 Smith International, Inc. Hardfacing compositions and hardfacing coatings formed by pulsed plasma-transferred arc
US6260636B1 (en) * 1999-01-25 2001-07-17 Baker Hughes Incorporated Rotary-type earth boring drill bit, modular bearing pads therefor and methods
US6478383B1 (en) * 1999-10-18 2002-11-12 Kennametal Pc Inc. Rotatable cutting tool-tool holder assembly
US20030110888A1 (en) * 2001-10-24 2003-06-19 Kosco John C. Powder metal materials having high temperature wear and corrosion resistance
US6649682B1 (en) * 1998-12-22 2003-11-18 Conforma Clad, Inc Process for making wear-resistant coatings

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995811A (en) * 1975-05-22 1976-12-07 Eutectic Corporation Nozzle for depositing metal powder by spraying
US4268089A (en) * 1978-05-31 1981-05-19 Winster Mining Limited Mounting means for pick on mining drum vane
US4201421A (en) * 1978-09-20 1980-05-06 Besten Leroy E Den Mining machine bit and mounting thereof
US4290555A (en) * 1979-02-21 1981-09-22 Nippon Sanso K. K. Method for supplying powder to be used in home spray coating operation
US4420459A (en) * 1980-10-20 1983-12-13 Gte Products Corporation Method of making preforms for brazing and hardfacing
US4660890A (en) * 1985-08-06 1987-04-28 Mills Ronald D Rotatable cutting bit shield
US4759505A (en) * 1985-10-22 1988-07-26 Castolin S.A. Flame spray torch for the manufacturing of surface layers on workpieces
US4901921A (en) * 1986-04-25 1990-02-20 Canadian Patents And Development Limited Particle injection device for thermal spraying
US4725098A (en) * 1986-12-19 1988-02-16 Kennametal Inc. Erosion resistant cutting bit with hardfacing
US4944559A (en) * 1988-06-02 1990-07-31 Societe Industrielle De Combustible Nucleaire Tool for a mine working machine comprising a diamond-charged abrasive component
US4932723A (en) * 1989-06-29 1990-06-12 Mills Ronald D Cutting-bit holding support block shield
US5251964A (en) * 1992-08-03 1993-10-12 Gte Valenite Corporation Cutting bit mount having carbide inserts and method for mounting the same
US5816324A (en) * 1996-05-03 1998-10-06 Smith International, Inc. Whipstock accelerator ramp
US5879743A (en) * 1996-08-28 1999-03-09 Deere & Company Method for hardfacing a metal surface
US6124564A (en) * 1998-01-23 2000-09-26 Smith International, Inc. Hardfacing compositions and hardfacing coatings formed by pulsed plasma-transferred arc
US6649682B1 (en) * 1998-12-22 2003-11-18 Conforma Clad, Inc Process for making wear-resistant coatings
US6260636B1 (en) * 1999-01-25 2001-07-17 Baker Hughes Incorporated Rotary-type earth boring drill bit, modular bearing pads therefor and methods
US6478383B1 (en) * 1999-10-18 2002-11-12 Kennametal Pc Inc. Rotatable cutting tool-tool holder assembly
US20030110888A1 (en) * 2001-10-24 2003-06-19 Kosco John C. Powder metal materials having high temperature wear and corrosion resistance

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8414085B2 (en) 2006-08-11 2013-04-09 Schlumberger Technology Corporation Shank assembly with a tensioned element
US20080067859A1 (en) * 2006-08-11 2008-03-20 Hall David R Shank Assembly
US20080115978A1 (en) * 2006-08-11 2008-05-22 Hall David R Shank Assembly with a Tensioned Element
US20080164748A1 (en) * 2006-08-11 2008-07-10 Hall David R Degradation Assembly
US7600823B2 (en) * 2006-08-11 2009-10-13 Hall David R Pick assembly
US7637574B2 (en) * 2006-08-11 2009-12-29 Hall David R Pick assembly
US9915102B2 (en) 2006-08-11 2018-03-13 Schlumberger Technology Corporation Pointed working ends on a bit
US7946656B2 (en) 2006-08-11 2011-05-24 Schlumberger Technology Corporation Retention system
US9708856B2 (en) 2006-08-11 2017-07-18 Smith International, Inc. Downhole drill bit
US9366089B2 (en) 2006-08-11 2016-06-14 Schlumberger Technology Corporation Cutting element attached to downhole fixed bladed bit at a positive rake angle
US9051795B2 (en) 2006-08-11 2015-06-09 Schlumberger Technology Corporation Downhole drill bit
US7992945B2 (en) 2006-08-11 2011-08-09 Schlumberger Technology Corporation Hollow pick shank
US7997661B2 (en) 2006-08-11 2011-08-16 Schlumberger Technology Corporation Tapered bore in a pick
US8007051B2 (en) 2006-08-11 2011-08-30 Schlumberger Technology Corporation Shank assembly
US8007050B2 (en) 2006-08-11 2011-08-30 Schlumberger Technology Corporation Degradation assembly
US8029068B2 (en) 2006-08-11 2011-10-04 Schlumberger Technology Corporation Locking fixture for a degradation assembly
US8033615B2 (en) 2006-08-11 2011-10-11 Schlumberger Technology Corporation Retention system
US8033616B2 (en) 2006-08-11 2011-10-11 Schlumberger Technology Corporation Braze thickness control
US8061784B2 (en) 2006-08-11 2011-11-22 Schlumberger Technology Corporation Retention system
US8201892B2 (en) 2006-08-11 2012-06-19 Hall David R Holder assembly
US8500209B2 (en) 2006-08-11 2013-08-06 Schlumberger Technology Corporation Manually rotatable tool
US20080036280A1 (en) * 2006-08-11 2008-02-14 Hall David R Pick Assembly
US8449040B2 (en) 2006-08-11 2013-05-28 David R. Hall Shank for an attack tool
US8454096B2 (en) 2006-08-11 2013-06-04 Schlumberger Technology Corporation High-impact resistant tool
US10029391B2 (en) 2006-10-26 2018-07-24 Schlumberger Technology Corporation High impact resistant tool with an apex width between a first and second transitions
US7976239B2 (en) 2006-12-01 2011-07-12 Hall David R End of a moldboard positioned proximate a milling drum
US8485756B2 (en) 2006-12-01 2013-07-16 David R. Hall Heated liquid nozzles incorporated into a moldboard
US8403595B2 (en) 2006-12-01 2013-03-26 David R. Hall Plurality of liquid jet nozzles and a blower mechanism that are directed into a milling chamber
US7976238B2 (en) 2006-12-01 2011-07-12 Hall David R End of a moldboard positioned proximate a milling drum
US8342611B2 (en) 2007-05-15 2013-01-01 Schlumberger Technology Corporation Spring loaded pick
US8292372B2 (en) 2007-12-21 2012-10-23 Hall David R Retention for holder shank
US7963615B2 (en) * 2008-11-05 2011-06-21 Alexander Greenspan Mining and demolition tool
US20100109418A1 (en) * 2008-11-05 2010-05-06 Alex Greenspan Mining and Demolition tool
US8636325B2 (en) 2008-11-05 2014-01-28 Gregory Greenspan Mining and demolition tool
US8322796B2 (en) 2009-04-16 2012-12-04 Schlumberger Technology Corporation Seal with contact element for pick shield
US8701799B2 (en) 2009-04-29 2014-04-22 Schlumberger Technology Corporation Drill bit cutter pocket restitution
US8250786B2 (en) 2010-06-30 2012-08-28 Hall David R Measuring mechanism in a bore hole of a pointed cutting element
US8261471B2 (en) 2010-06-30 2012-09-11 Hall David R Continuously adjusting resultant force in an excavating assembly
US8262168B2 (en) 2010-09-22 2012-09-11 Hall David R Multiple milling drums secured to the underside of a single milling machine
US20170343113A1 (en) * 2011-01-17 2017-11-30 Hamilton Sundstrand Corporation Thrust plate for butterfly valve
US20130026810A1 (en) * 2011-07-25 2013-01-31 Kennametal Inc. Cutting Tool Assembly with Protective Member
CN102900012A (en) * 2011-07-25 2013-01-30 钴碳化钨硬质合金公司 Cutting tool assembly with protective member

Similar Documents

Publication Publication Date Title
US3499685A (en) Pick-type mining bit with support block having rotatable seat
US5492186A (en) Steel tooth bit with a bi-metallic gage hardfacing
US3746396A (en) Cutter bit and method of causing rotation thereof
US5324098A (en) Cutting tool having hard tip with lobes
US5078219A (en) Concave drag bit cutter device and method
US6024143A (en) Cutting tooth assembly
US5219209A (en) Rotatable cutting bit insert
US5833020A (en) Rolling cone bit with enhancements in cutter element placement and materials to optimize borehole corner cutting duty
US7665552B2 (en) Superhard insert with an interface
US5842747A (en) Apparatus for roadway surface reclaiming drum
US4561698A (en) Wear protector for tooth brackets on roadway surface cutting machines
US4940188A (en) Tip holder for mineral breaker
US5141289A (en) Cemented carbide tip
EP0546725A1 (en) Improvents in or relating to cutting elements for rotary drill bits
US20040026132A1 (en) Pick for disintegrating natural and man-made materials
US7320505B1 (en) Attack tool
US5518077A (en) Rotary drill bit with improved cutter and seal protection
US6019434A (en) Point attack bit
US4660890A (en) Rotatable cutting bit shield
US5333938A (en) Cutter bit
US7669938B2 (en) Carbide stem press fit into a steel body of a pick
USRE29900E (en) Pick-type mining bit with support block having rotatable seat
US7204560B2 (en) Rotary cutting bit with material-deflecting ledge
US20090051211A1 (en) Thick Pointed Superhard Material
US6113195A (en) Rotatable cutting bit and bit washer therefor

Legal Events

Date Code Title Description
AS Assignment

Owner name: KENNAMETAL INC., PENNSYLVANIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MONDY, MICHAEL C.;WEBB, KIRK E.;REEL/FRAME:014435/0968;SIGNING DATES FROM 20030811 TO 20030821