US20030230926A1 - Rotating cutter bit assembly having hardfaced block and wear washer - Google Patents
Rotating cutter bit assembly having hardfaced block and wear washerDownload PDFInfo
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- US20030230926A1 US20030230926A1US10/444,539US44453903AUS2003230926A1US 20030230926 A1US20030230926 A1US 20030230926A1US 44453903 AUS44453903 AUS 44453903AUS 2003230926 A1US2003230926 A1US 2003230926A1
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- United States
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- bit
- bit holder
- block assembly
- assembly according
- cutter
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
- 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
- B28D1/18—Working 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
- B28D1/186—Tools therefor, e.g. having exchangeable cutter bits
- B28D1/188—Tools therefor, e.g. having exchangeable cutter bits with exchangeable cutter bits or cutter segments
Definitions
- This inventionrelates 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.
- cutting bitsare mounted to be rotatable about the central axis of the cutting bit mounted in a support block.
- the rotation of the cutting bitprovides for uniform wear of the cutting bit improving the effective life of the cutting tool.
- the rotatable cutting bitshave a flange bottom face that bears against the top face of the support block.
- the support blockexperienced 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.
- bearing washerssuch 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.
- this bearing washerprovided other advantages.
- One advantageis 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.
- the Ojanen U.S. Pat. No. 5,251,964discloses 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 designwas 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 blockis made from such hardened steel.
- the contact of prior art cutter bit hardened steel against the top face of the support blockshaved and fractured the plurality of carbide inserts.
- An object of the present inventionis 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.
- Another object of the inventionis 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.
- Another object of the inventionis 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.
- FIG. 1is a side view of the cutter block assembly of the present invention.
- FIG. 2is a front view of the block for the present invention.
- FIG. 3is a side view of the cutting bit assembly of the present invention.
- the cutter block assembly 10 of the present inventionis illustrated in FIG. 1.
- the cutter block assembly 10includes a holder block 12 and a rotatable cutter bit 14 fixed therein.
- the top face 11 of the blockhas a hardfacing material deposited thereon represented by the speckled/shaded grit.
- the cutter bit assemblyis best shown in FIG. 3.
- the cutter bit assemblyincludes a cutter body having an integral conical head 18 and shaft 24 , cutting tip 16 , a retainer 22 and a bearing washer 20 .
- the cutter bit assembly 14is first inserted and manually knocked into the bore 15 of the holder block, typically with a hammer.
- the retainer sleeve 22is 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.
- the holder block of the present inventionis constructed from a steel alloy heat treated to a Rockwell hardness number of between 45-55 Rockwell “C”.
- the steel alloyis constructed from AISI 8740 heat treated to Rockwell Hardness of between 45-50 RHc.
- the composition of AISI steelis 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.
- the hardfacingcould 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.
- the hardfacingcould 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 hardfacingis 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) ⁇ ′′.
- the hardfacing materialis 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 inventionhas 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% %.
- the hardfacing compositionis 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 compositionis 78% Nickel, 11.7 % Chromium, 4.1% Iron, 0.9% silicon and 0.5% tungsten.
- the holding washeris made from typical Spring Steel employed and well known in the industry, including but not limited to AISI 1060, 1070 & 1080 steel.
- the holding washermay 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 43-48can 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.
- the cutter tip 16is typically made from a cemented carbide material such as, for example, a cobalt-tungsten carbide alloy.
- a cemented carbide materialsuch as, for example, a cobalt-tungsten carbide alloy.
- rotatable cutting tools used in road planing applicationsmay 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 carbidemay range between about 86 and about 90.4 Rockwell A.
- a preferred grade of cemented tungsten carbide for a road planing applicationhas 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.
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Earth Drilling (AREA)
Abstract
Description
- This application is a nonprovisional application of U.S. Provisional Application No. 60/385,683, filed Jun. 4, 2002.[0001]
- 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 sleeve42 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]
- 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]
- 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]
- The[0018]
cutter block assembly 10 of the present invention is illustrated in FIG. 1. Thecutter block assembly 10 includes aholder block 12 and arotatable cutter bit 14 fixed therein. As best seen in FIG. 2, thetop 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[0019]
conical head 18 andshaft 24,cutting tip 16, aretainer 22 and abearing washer 20. Thecutter bit assembly 14 is first inserted and manually knocked into thebore 15 of the holder block, typically with a hammer. Theretainer sleeve 22 is made from Spring Steel that is held in a compressed loaded position by theholding 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 thecutter bit assembly 14 is hammered into thebore 15 of the holder block thebearing washer 20 moves upward toward theconical head 18 above theretainer 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[0024]
cutter tip 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)
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 toclaim 1 wherein said cutting tool is rotatable.
3. The cutter block assembly according toclaim 2 wherein said bit holder block is constructed from a steel alloy.
4. The cutter block assembly according toclaim 3 wherein said steel alloy has a Rockwell “C” hardness number between 45-55 Rc.
5. The cutter block assembly according toclaim 3 wherein said hardface coating has a Rockwell “C” hardness number between 57-63 Rc.
6. The cutter block assembly according toclaim 4 wherein said hardface coating has a Rockwell “C” hardness number between 57-63 Rc.
7. The cutter block assembly according toclaim 6 wherein said washer has a Rockwell “C” hardness number between 43-48 Rc.
8. The cutter block assembly according toclaim 1 wherein said coating has a depth of between {fraction (1/16)}″-{fraction (3/32)}″.
9. The cutter block assembly according toclaim 8 wherein said hardface coating has a Rockwell “C” hardness number between 57-63 Rc.
10. The cutter block assembly according toclaim 3 wherein said hardface coating comprises Silicon, Chromium, Iron, Boron and Nickel.
11. The cutter block assembly according toclaim 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 toclaim 11 wherein said hardface coating has a Rockwell hardness value between 57-63 Rc.
13. The cutter block assembly according toclaim 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 toclaim 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 toclaim 15 wherein said bit holder block is manufactured from a steel alloy.
17. The bit holder according toclaim 16 wherein said steel alloy has a Rockwell “C” hardness number between 45-55 Rc.
18. The bit holder according toclaim 15 wherein said hardface coating comprises Silicon, Chromium, Iron, Boron and Nickel.
19. The bit holder according toclaim 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 toclaim 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/444,539US20030230926A1 (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 |
|---|---|---|---|
| US10/444,539US20030230926A1 (en) | 2003-05-23 | 2003-05-23 | Rotating cutter bit assembly having hardfaced block and wear washer |
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| Publication Number | Publication Date |
|---|---|
| US20030230926A1true US20030230926A1 (en) | 2003-12-18 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10/444,539AbandonedUS20030230926A1 (en) | 2003-05-23 | 2003-05-23 | Rotating cutter bit assembly having hardfaced block and wear washer |
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| 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 |
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| US7419224B2 (en) | 2006-08-11 | 2008-09-02 | Hall David R | Sleeve in a degradation assembly |
| US7445294B2 (en) | 2006-08-11 | 2008-11-04 | Hall David R | Attack tool |
| US7464993B2 (en) | 2006-08-11 | 2008-12-16 | Hall David R | Attack tool |
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| US10378288B2 (en) | 2006-08-11 | 2019-08-13 | Schlumberger Technology Corporation | Downhole drill bit incorporating cutting elements of different geometries |
| US7946656B2 (en) | 2006-08-11 | 2011-05-24 | Schlumberger Technology Corporation | Retention system |
| US9915102B2 (en) | 2006-08-11 | 2018-03-13 | Schlumberger Technology Corporation | Pointed working ends on a bit |
| 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 |
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| US7997661B2 (en) | 2006-08-11 | 2011-08-16 | Schlumberger Technology Corporation | Tapered bore in a pick |
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| US8029068B2 (en) | 2006-08-11 | 2011-10-04 | Schlumberger Technology Corporation | Locking fixture for a degradation assembly |
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| US8454096B2 (en) | 2006-08-11 | 2013-06-04 | Schlumberger Technology Corporation | High-impact resistant tool |
| US8449040B2 (en) | 2006-08-11 | 2013-05-28 | David R. Hall | Shank for an attack tool |
| US8414085B2 (en) | 2006-08-11 | 2013-04-09 | Schlumberger Technology Corporation | Shank assembly with a tensioned element |
| 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 |
| US8485756B2 (en) | 2006-12-01 | 2013-07-16 | David R. Hall | Heated liquid nozzles incorporated into a moldboard |
| US7976238B2 (en) | 2006-12-01 | 2011-07-12 | Hall David R | End of a moldboard positioned proximate a milling drum |
| 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 |
| US7976239B2 (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 |
| US8636325B2 (en) | 2008-11-05 | 2014-01-28 | Gregory Greenspan | Mining and demolition tool |
| US20100109418A1 (en)* | 2008-11-05 | 2010-05-06 | Alex Greenspan | Mining and Demolition tool |
| US8322796B2 (en) | 2009-04-16 | 2012-12-04 | Schlumberger Technology Corporation | Seal with contact element for pick shield |
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| US8261471B2 (en) | 2010-06-30 | 2012-09-11 | Hall David R | Continuously adjusting resultant force in an excavating 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 |
| 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 |
| US20250122803A1 (en)* | 2021-07-15 | 2025-04-17 | Bit Service Company Ltd | Rebuildable hard surface cutting tip for mining bit |
| CN115255460A (en)* | 2022-08-23 | 2022-11-01 | 海门宝利康精工科技有限公司 | Energy-saving aluminum profile tapping equipment capable of reducing deformation resistance |
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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 | |
| STCB | Information on status: application discontinuation | Free format text:ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |