CA1039266A - Drill bit - Google Patents
Drill bitInfo
- Publication number
- CA1039266A CA1039266A CA258,777A CA258777A CA1039266A CA 1039266 A CA1039266 A CA 1039266A CA 258777 A CA258777 A CA 258777A CA 1039266 A CA1039266 A CA 1039266A
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- drill bit
- bit according
- journal
- silver
- 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.)
- Expired
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 30
- 239000000314 lubricant Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims description 19
- 239000011248 coating agent Substances 0.000 claims description 18
- 229910052709 silver Inorganic materials 0.000 claims description 17
- 239000004332 silver Substances 0.000 claims description 17
- 239000004519 grease Substances 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 12
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 10
- 238000005461 lubrication Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 230000001050 lubricating effect Effects 0.000 claims description 7
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 6
- 229910052738 indium Inorganic materials 0.000 claims description 6
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 6
- 229910052718 tin Inorganic materials 0.000 claims description 6
- 230000000153 supplemental effect Effects 0.000 claims description 4
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- 229910001240 Maraging steel Inorganic materials 0.000 claims description 2
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 claims description 2
- 239000013528 metallic particle Substances 0.000 claims 5
- 239000011133 lead Substances 0.000 claims 4
- 239000011135 tin Substances 0.000 claims 4
- 239000000463 material Substances 0.000 claims 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910017052 cobalt Inorganic materials 0.000 description 4
- 239000010941 cobalt Substances 0.000 description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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
- E21B10/08—Roller bits
- E21B10/22—Roller bits characterised by bearing, lubrication or sealing details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/12—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load
- F16C17/18—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load with floating brasses or brushing, rotatable at a reduced speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
- F16C33/122—Multilayer structures of sleeves, washers or liners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2352/00—Apparatus for drilling
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Earth Drilling (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A roller cutter drill bit comprises a body having a journal, a roller cutter, bearing means for rotatively mounting a roller cutter on the journal and a part of said bearing means including a hard, tough metal bushing with a lubricant metal coated thereon, and positioned between the sleeve and the journal and between the sleeve and the roller cutter to prevent galling.
A roller cutter drill bit comprises a body having a journal, a roller cutter, bearing means for rotatively mounting a roller cutter on the journal and a part of said bearing means including a hard, tough metal bushing with a lubricant metal coated thereon, and positioned between the sleeve and the journal and between the sleeve and the roller cutter to prevent galling.
Description
~: :
J :
39;~
DRILI, BIT ~
..~ ;.
BACKGROUND OF T~E INVENTION
The drilling industry has devoted considerable effort to the improvement of bearings for roller cutter drill bits.
To have a suffiGiently long drilling life to be commercially -useful, the bearings should have a minimum of friction and wear. ;
Many hard, tough bearing metals have the disadvantage that they tend to gall badly.
SUMMARY OF THE INVENTION
The present invention provides an improved roller cutter drill bit bearing of a hard, tough metal having sufficient lubricity that the tendency toward galling is overcome.
, ~ -" ~ ., i An object of the present invention is to provide an ~;
improved roller cutter drill bit having a bearing means with ~15 a long life. ~. --A further object is to provide an improved roller cutter I drill bit having a bearing of hard tough metal which is not subject to galling.
~ Those objects are attained by the invention which con-j 20 templates a drill bit which comprises a body having a journal '~ extending therefrom, a roller cutter, and bearing means for : A ~ `
--1-- , ; .
.. ', .: :. ~; ., .~. - ~ . . .. . . . ..
.. ;. . .. , . . ~ . . . . .
3~3Z66 rotatively mounting the roller cutter on the journal. At leas-t part oE the bearing means i~ncludes a hard tough metal sleeve, haviny a Rockwell C hardness of at least 35 -~ posit~oned around the journal within the roller cutter, and a metal coating on thatsleeve has lubricating properties positioned between the sleeve and the journal and between the sleeve and the roller cutter. The metal coating imparts sufficient ~ ;
lubricity to the sleeve to prevent galling oE the roller cutter and the journal.
BRI~F DE~CRIPTION OF THE DRAWING
The figure is a sectional view of a portlon of a drill bit embodying the improved structure of the present invention.
DESCRIPTION OF T~IE PREFERRED EM~ODIMENTS
; The drill bit 10 shown in the figure includes the body 12 having at least one leg 14 extendiny therefrom. The leg l~ terminates in the journal 16 about which the roller cutter 18 is rotatively mounted by suitable bearing means. The bear-ing means includes the ball bearings 20, the sleeve bearing 22 and the bearing surfaces 24 and 26. The seal 28 is positioned in the groove 30 in roller cutter 18. The seal 28 functions as the outer seal for the lubricant system (not shown) which supplies lubricant to the bearings.
Sleeve bearing 22 is of a floating sleeve type of bearing or bushing. The sleeve bearing 22 is made of a hard tough metal which has a Rockwell C hardness of at least 35 and is treated to provide a lubricated surface which mitigates or substantially `~
eliminates the tendency toward galling. The metal of the bearing should be hard and tough to resist the high wear encountered in a drill bit. The bearing may be of a beryllium-copper alloy such as an alloy of copper containing 0.25-3.0~ beryllium, preferably about 1.80-2.05%. The alloy may contain lesser amounts of cobalt, nickel and iron, e.g. 0.20-0 30% cobalt or a mixture : of cobalt and nickel of at least 0.2% or a mixture of cobalt, : : ~ . .
~ ~ 9 Z6 ~
nickel and iron not exceeding '~.6~. An alloy of this type may have a modulus of elasticity of 18,500,000 and may be solution annealed and age hardened to a tensile strength of 165,000 to 190,000 PSI haviny a Rockwell C hardness of 36 to ~1.
Alternatively, the bearing 22 may be of a maraging steel alloy which has been heat treated to a maximum of hardness ' which is preferably of about Rockwell C 50 to 55. Other hard 1 tough alloys may be used and the properties required are a ~' combination of strength, hardness and toughness. The metal should have a high tensile strength accompanied by considerable toughness and a Rockwell C hardness in excess of 35.
' In order to prevent galling, the sleeve bearing 22 is coated, as by plating or by various metalizing techniques, ' with a soft lubricant metal such as lead, indium, tin, copper or ' 15 s;lver. A silver plating or other silver coa-ting is the preferred ,, lubricant for the bearing 22 and is coated on the exterior and interior to a reasonab'le thickness, such as one mi'l. Also ' multiple coatings may be used, e.g. lead over silver, indium over lead over silver, tin over silver, etc.
The bit may also be provided with supplemental lubrication consisting of fine particles oP a lubricating metal such as .' :
copper or silver suspended in the grease which is loaded into the lubrication system. In this manner, the particles are initially all around the bearing sleeve 22 and during operation ' 25 the particles provide additional lubricity which assists in avoiding the galling problems encountered with most hard tough ' ~ nietal bearinas.
' ' In a bit constructed as described above, the bearing sleeve is resistent to extrusion under hedvy loads and the sleeve func-tions better as a bearing because it has greater hardness and ' toughness. The'coating or plating of silver or copper or :` other soft lubricant metal on the bearing sleeve provides a Case No. 127 ' ' .
. .
..
: :" ,~ . ~ , . . ~ ., 26~
greater resistance to ~alling since -the metal coating may transfer back and forth between the bedring and the surface ;~ contacted by the bearing under conditi.ons of use. The metal coating on the bearing transfers freely between the contact surfaces and prevents yalling. .
From the foregoing, it could be seen that the present invention provides an improved drill bit with a sleeve beariny having greater toughness, hardness and temperature resistance than prior sleeve bearings and as a result of the lubricant .
:~ ld coating is not subject to appreciable g.alling.
' ' .. ' ' '','':
.~
, ' ~ :
, ~ '' Case No. 127 .. ....
i; . ~ .. ~. . ~ .: . .
J :
39;~
DRILI, BIT ~
..~ ;.
BACKGROUND OF T~E INVENTION
The drilling industry has devoted considerable effort to the improvement of bearings for roller cutter drill bits.
To have a suffiGiently long drilling life to be commercially -useful, the bearings should have a minimum of friction and wear. ;
Many hard, tough bearing metals have the disadvantage that they tend to gall badly.
SUMMARY OF THE INVENTION
The present invention provides an improved roller cutter drill bit bearing of a hard, tough metal having sufficient lubricity that the tendency toward galling is overcome.
, ~ -" ~ ., i An object of the present invention is to provide an ~;
improved roller cutter drill bit having a bearing means with ~15 a long life. ~. --A further object is to provide an improved roller cutter I drill bit having a bearing of hard tough metal which is not subject to galling.
~ Those objects are attained by the invention which con-j 20 templates a drill bit which comprises a body having a journal '~ extending therefrom, a roller cutter, and bearing means for : A ~ `
--1-- , ; .
.. ', .: :. ~; ., .~. - ~ . . .. . . . ..
.. ;. . .. , . . ~ . . . . .
3~3Z66 rotatively mounting the roller cutter on the journal. At leas-t part oE the bearing means i~ncludes a hard tough metal sleeve, haviny a Rockwell C hardness of at least 35 -~ posit~oned around the journal within the roller cutter, and a metal coating on thatsleeve has lubricating properties positioned between the sleeve and the journal and between the sleeve and the roller cutter. The metal coating imparts sufficient ~ ;
lubricity to the sleeve to prevent galling oE the roller cutter and the journal.
BRI~F DE~CRIPTION OF THE DRAWING
The figure is a sectional view of a portlon of a drill bit embodying the improved structure of the present invention.
DESCRIPTION OF T~IE PREFERRED EM~ODIMENTS
; The drill bit 10 shown in the figure includes the body 12 having at least one leg 14 extendiny therefrom. The leg l~ terminates in the journal 16 about which the roller cutter 18 is rotatively mounted by suitable bearing means. The bear-ing means includes the ball bearings 20, the sleeve bearing 22 and the bearing surfaces 24 and 26. The seal 28 is positioned in the groove 30 in roller cutter 18. The seal 28 functions as the outer seal for the lubricant system (not shown) which supplies lubricant to the bearings.
Sleeve bearing 22 is of a floating sleeve type of bearing or bushing. The sleeve bearing 22 is made of a hard tough metal which has a Rockwell C hardness of at least 35 and is treated to provide a lubricated surface which mitigates or substantially `~
eliminates the tendency toward galling. The metal of the bearing should be hard and tough to resist the high wear encountered in a drill bit. The bearing may be of a beryllium-copper alloy such as an alloy of copper containing 0.25-3.0~ beryllium, preferably about 1.80-2.05%. The alloy may contain lesser amounts of cobalt, nickel and iron, e.g. 0.20-0 30% cobalt or a mixture : of cobalt and nickel of at least 0.2% or a mixture of cobalt, : : ~ . .
~ ~ 9 Z6 ~
nickel and iron not exceeding '~.6~. An alloy of this type may have a modulus of elasticity of 18,500,000 and may be solution annealed and age hardened to a tensile strength of 165,000 to 190,000 PSI haviny a Rockwell C hardness of 36 to ~1.
Alternatively, the bearing 22 may be of a maraging steel alloy which has been heat treated to a maximum of hardness ' which is preferably of about Rockwell C 50 to 55. Other hard 1 tough alloys may be used and the properties required are a ~' combination of strength, hardness and toughness. The metal should have a high tensile strength accompanied by considerable toughness and a Rockwell C hardness in excess of 35.
' In order to prevent galling, the sleeve bearing 22 is coated, as by plating or by various metalizing techniques, ' with a soft lubricant metal such as lead, indium, tin, copper or ' 15 s;lver. A silver plating or other silver coa-ting is the preferred ,, lubricant for the bearing 22 and is coated on the exterior and interior to a reasonab'le thickness, such as one mi'l. Also ' multiple coatings may be used, e.g. lead over silver, indium over lead over silver, tin over silver, etc.
The bit may also be provided with supplemental lubrication consisting of fine particles oP a lubricating metal such as .' :
copper or silver suspended in the grease which is loaded into the lubrication system. In this manner, the particles are initially all around the bearing sleeve 22 and during operation ' 25 the particles provide additional lubricity which assists in avoiding the galling problems encountered with most hard tough ' ~ nietal bearinas.
' ' In a bit constructed as described above, the bearing sleeve is resistent to extrusion under hedvy loads and the sleeve func-tions better as a bearing because it has greater hardness and ' toughness. The'coating or plating of silver or copper or :` other soft lubricant metal on the bearing sleeve provides a Case No. 127 ' ' .
. .
..
: :" ,~ . ~ , . . ~ ., 26~
greater resistance to ~alling since -the metal coating may transfer back and forth between the bedring and the surface ;~ contacted by the bearing under conditi.ons of use. The metal coating on the bearing transfers freely between the contact surfaces and prevents yalling. .
From the foregoing, it could be seen that the present invention provides an improved drill bit with a sleeve beariny having greater toughness, hardness and temperature resistance than prior sleeve bearings and as a result of the lubricant .
:~ ld coating is not subject to appreciable g.alling.
' ' .. ' ' '','':
.~
, ' ~ :
, ~ '' Case No. 127 .. ....
i; . ~ .. ~. . ~ .: . .
Claims (17)
1. A drill bit, comprising a body having a journal extending therefrom, a roller cutter, bearing means for rotatively mounting said roller cutter on said journal, at least part of said bearing means including a hard tough metal sleeve having a Rockwell C hardness of at least 35 positioned around said journal within said roller cutter, and a metal coating on said sleeve having lubricating properties positioned between said sleeve and said journal and between said sleeve and said roller cutter, said metal coating imparting sufficient lubricity to said sleeve to prevent galling of said roller cutter and said journal.
2. A drill bit according to Claim 1 wherein said hard tough metal sleeve is a heat-treated maraging steel sleeve having a Rockwell C hardness of at least 50.
3. A drill bit according to Claim 1 wherein said metal coating is at least one layer of silver, copper, tin, lead or indium.
4. A drill bit according to Claim 2 wherein said metal coating is at least one layer of silver, copper, tin, lead or indium.
5. A drill bit according to Claim 1 wherein said metal coating is plated on said sleeve.
6. A drill bit according to Claim 2, Claim 3 or Claim 4 wherein said metal coating is plated on said sleeve.
7. A drill bit according to Claim 1, Claim 2 or Claim 4 wherein said metal coating is applied to said sleeve by metalizing.
8. A drill bit according to Claim 1, Claim 2 or Claim 4 wherein said metal coating comprises a plurality of layers of lubricating metal.
9. A drill bit according to Claim 3 or Claim 4 wherein said metal coating includes at least one additional layer of metal coating, wherein said additional layer is copper, silver, tin, lead or indium.
10. A drill bit according to Claim 1, Claim 2 or Claim 3 wherein said sleeve is of beryllium-copper alloy.
11. A drill bit according to Claim 1 or Claim 3 wherein there is provided between said sleeve, said journal, and said cutter, supplemental lubricating material comprising a grease containing metallic particles, wherein said particles consist of indium, tin, lead, silver or copper.
12. A drill bit according to Claim 2 wherein there is provided supplemental lubricating material selected from the group consisting of silver and copper.
13. A drill bit according to Claim 1, including a lubrication system within said body and in communication with said bearing means, a lubricant grease having metallic particles dispersed therein, wherein said metallic particles consist of silver or copper, and said lubricant grease being added to said lubrication system whereby the grease and particles are delivered to the areas of contact on said sleeve with said journal and said roller cutter.
14. A drill bit according to Claim 3, including a lubrication system within said body and in communication with said bearing means, a lubricant grease having metallic particles dispersed therein, wherein said metallic particles consist of silver or copper, and said lubricant grease being added to said lubrication system whereby the grease and particles are delivered to the areas of contact on said sleeve with said journal and said roller cutter.
15. A drill bit according to Claim 2 or Claim 4, including a lubrication system within said body and in communication with said bearing means, a lubricant grease having particles selected from the group consisting of silver and copper dispersed therein, said lubricant grease being added to said lubrication system whereby the grease and particles are delivered to the areas of contact on said sleeve with said journal and said roller cutter.
16. A drill bit according to Claim 5, Claim 13 or Claim 14 wherein said metal coating is silver.
17. A drill bit according to Claim 12 wherein said supplemental lubricating material is a lubricant grease having particles selected from the group consisting of silver and copper dispersed therein, and said grease is supplied to the area between said sleeve and said journal and between said sleeve and said roller cutter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/604,264 US3990751A (en) | 1975-08-13 | 1975-08-13 | Drill bit |
| US05/695,505 US4074922A (en) | 1975-08-13 | 1976-06-11 | Drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1039266A true CA1039266A (en) | 1978-09-26 |
Family
ID=27084622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA258,777A Expired CA1039266A (en) | 1975-08-13 | 1976-08-10 | Drill bit |
Country Status (16)
| Country | Link |
|---|---|
| JP (1) | JPS5222501A (en) |
| AT (1) | AT352052B (en) |
| AU (1) | AU502035B2 (en) |
| BR (1) | BR7605280A (en) |
| CA (1) | CA1039266A (en) |
| CH (1) | CH610982A5 (en) |
| DE (1) | DE2636179A1 (en) |
| DK (1) | DK363976A (en) |
| ES (1) | ES450637A1 (en) |
| FR (1) | FR2321034A1 (en) |
| GB (1) | GB1521833A (en) |
| IT (1) | IT1073442B (en) |
| MX (1) | MX143147A (en) |
| NL (1) | NL7608964A (en) |
| NO (1) | NO762541L (en) |
| SE (1) | SE7609015L (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5016719A (en) * | 1990-01-24 | 1991-05-21 | Western Rock Bit Company Limited | Rotary cone type rock bits |
| US5186267A (en) * | 1990-02-14 | 1993-02-16 | Western Rock Bit Company Limited | Journal bearing type rock bit |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4402617A (en) * | 1981-05-12 | 1983-09-06 | Dresser Industries, Inc. | Thin wall sintered bushing for a rock bit |
| DE3207237C2 (en) * | 1982-02-25 | 1984-06-07 | Mannesmann AG, 4000 Düsseldorf | Threaded connection for oilfield pipes |
| GB2127071B (en) * | 1982-09-22 | 1985-09-18 | Reed Rock Bit Co | Friction bearing assembly for a roller cutter drill bit |
| DE3429897C2 (en) * | 1984-08-14 | 1991-07-18 | Maho Werkzeugmaschinenbau Babel & Co, 8962 Pfronten | Adjustable straight line for machine tools in particular |
| JPH0533453Y2 (en) * | 1989-05-30 | 1993-08-25 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2465329A (en) * | 1944-05-20 | 1949-03-22 | Indium Corp America | Indium treated copper clad bearing and like articles and method of making the same |
| US3150901A (en) * | 1961-11-17 | 1964-09-29 | Gen Electric | Bearing surfaces |
| US3235316A (en) * | 1963-04-22 | 1966-02-15 | Hughes Tool Co | Journal bearing with alternating surface areas of wear resistant and antigalling materials |
| US3784264A (en) * | 1971-03-02 | 1974-01-08 | Dresser Ind | Earth boring bit bearing system having a pitted bearing surface |
| US3721307A (en) * | 1971-04-27 | 1973-03-20 | Murphy Ind Inc | Drill bit bearings |
| FR2182287A5 (en) * | 1972-04-25 | 1973-12-07 | Creusot Loire | |
| US3984158A (en) * | 1973-09-10 | 1976-10-05 | Dresser Industries, Inc. | Journal and pilot bearings with alternating surface areas of wear resistant and anti-galling materials |
| US3866987A (en) * | 1974-01-14 | 1975-02-18 | Smith International | Drill bit with laminated friction bearing |
| FR2300931A1 (en) * | 1975-02-14 | 1976-09-10 | Creusot Loire | Antiseizure plain bearings - particularly with double bearing surface in rotary drilling bits |
-
1976
- 1976-07-21 NO NO762541A patent/NO762541L/no unknown
- 1976-07-29 GB GB31723/76A patent/GB1521833A/en not_active Expired
- 1976-07-30 MX MX165726A patent/MX143147A/en unknown
- 1976-08-09 JP JP51094067A patent/JPS5222501A/en active Pending
- 1976-08-10 CA CA258,777A patent/CA1039266A/en not_active Expired
- 1976-08-11 IT IT50841/76A patent/IT1073442B/en active
- 1976-08-11 DE DE19762636179 patent/DE2636179A1/en not_active Withdrawn
- 1976-08-11 FR FR7624513A patent/FR2321034A1/en active Granted
- 1976-08-12 AU AU16804/76A patent/AU502035B2/en not_active Expired
- 1976-08-12 ES ES450637A patent/ES450637A1/en not_active Expired
- 1976-08-12 CH CH1029076A patent/CH610982A5/en not_active IP Right Cessation
- 1976-08-12 NL NL7608964A patent/NL7608964A/en not_active Application Discontinuation
- 1976-08-12 BR BR7605280A patent/BR7605280A/en unknown
- 1976-08-12 AT AT601176A patent/AT352052B/en not_active IP Right Cessation
- 1976-08-12 SE SE7609015A patent/SE7609015L/en unknown
- 1976-08-12 DK DK363976A patent/DK363976A/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5016719A (en) * | 1990-01-24 | 1991-05-21 | Western Rock Bit Company Limited | Rotary cone type rock bits |
| US5186267A (en) * | 1990-02-14 | 1993-02-16 | Western Rock Bit Company Limited | Journal bearing type rock bit |
Also Published As
| Publication number | Publication date |
|---|---|
| ATA601176A (en) | 1979-02-15 |
| AU502035B2 (en) | 1979-07-12 |
| DK363976A (en) | 1977-02-14 |
| AT352052B (en) | 1979-08-27 |
| AU1680476A (en) | 1978-02-16 |
| BR7605280A (en) | 1977-08-09 |
| SE7609015L (en) | 1977-02-14 |
| CH610982A5 (en) | 1979-05-15 |
| FR2321034B1 (en) | 1982-10-29 |
| GB1521833A (en) | 1978-08-16 |
| FR2321034A1 (en) | 1977-03-11 |
| NO762541L (en) | 1977-02-15 |
| IT1073442B (en) | 1985-04-17 |
| DE2636179A1 (en) | 1977-02-24 |
| NL7608964A (en) | 1977-02-15 |
| JPS5222501A (en) | 1977-02-19 |
| MX143147A (en) | 1981-03-25 |
| ES450637A1 (en) | 1977-07-16 |
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