US2174980A - Diamond bit - Google Patents
Diamond bit Download PDFInfo
- Publication number
- US2174980A US2174980A US250469A US25046939A US2174980A US 2174980 A US2174980 A US 2174980A US 250469 A US250469 A US 250469A US 25046939 A US25046939 A US 25046939A US 2174980 A US2174980 A US 2174980A
- Authority
- US
- United States
- Prior art keywords
- bit
- matrix
- blank
- embedded
- core
- 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 - Lifetime
Links
- 239000010432 diamond Substances 0.000 title description 15
- 229910003460 diamond Inorganic materials 0.000 title description 7
- 239000011159 matrix material Substances 0.000 description 41
- 239000002184 metal Substances 0.000 description 20
- 229910052751 metal Inorganic materials 0.000 description 20
- 238000005266 casting Methods 0.000 description 5
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 241000858799 Erica lusitanica Species 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
Images
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
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/48—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type
Definitions
- Our invention is directed to improvements in diamond bits and has for one of its objects the provision of a diamond bit of improved con struction.
- Diamond core bits as heretofore constructed have consisted of a bit blank with an alloy cast on the exterior of the end of the same, the face of this casting or matrix being studded with cutting stones, such as commercial diamonds, which are embedded in the .alloy in the casting operation, and provide the cutting face or surface of the bit.
- the bit is hollow and the inner wall of the annular member or matrix, adjacent the outer end thereof, is lined with cutting stones also.
- the diamonds and the bit blank are set up in a suitable mold and molten metal flowed into the mold. In order that the diamonds may not be.
- our invention provides a core bit wherein that part of the bit which previously is readily undercut is of a hard metal, thereby providing a bit which has a much longer life than prior bits and in which the diamonds are not readily dislodged.
- Fig. 1 is a sectional elevational view of the bit
- Fig. 2 is an exploded view of the bit blank and hard metal ring entering into our construction.
- 2 designates the bit blank.
- This bit blank may be of steel or other metal desired.
- the shank of the bit blank is threaded, as shown at l, as is usual.
- the head of this bit blank is flared internally, as seen at 6, and this flared interior is provided with locking shoulders 8.
- the wall of the head of the bit blank is provided with apertures in which also function as locks, as will be brought out hereinafter.
- the matrix i2 for the diamonds ll or other cutting elements.
- the matrix is an annulus, and the cutting elements I are not only disposed inthe face of this annulus but about the inner wall of the annulus adjacent the workingface or forward end of the bit, as shown at IS.
- the matrix I2, which is a casting, is composed of any of the metals or alloys commonly employed in the diamond bit industry.
- a preformed hard metal ring i8 Adjacent the mouth or forward end of the bit, we provide a preformed hard metal ring i8, for example, a. steel ring. This ring is embedded in the matrix l2 and lies Just within the end of the matrix just above the cutting stones IS with which the mouth of the bit is provided, as above explained.
- the bit blank 2 In manufacturing our bit, the bit blank 2, the ring I! and the stones ll are assembled in a suitable mold, and the metal of the matrix I! poured thereinto, the metal flowing about the cutting stones and about the hard metal ring i8 to embed the same. It will be appreciated, also, that the metal flows into the locking apertures l0 and that these together with the locking shoulders 8 securely lock the matrix to the bit blank.
- the preformed hard metal ring l8 will reinforce the matrix and prevent undercutting and dislodgment of the diamonds or other cutting elements, when the bit is being used, the core of the ore being drilled, as the same passes through the hollow matrix, being kept out of contact with the matrix adjacent the nose of the bit by the ring.
- a core bit comprising in combination a bit blank, a matrix in the form of an annulus carried by the bit blank, cutting stones in the face of the matrix, and a preformed hard metal ring embedded in theinner wall of the matrix adjacent the working face of the bit.
- a core bit comprising in combination a bit blank. a matrix in the form of an annulus carried within the blank, cutting stones in the inner wall of the matrix. and a preformed hard metal ring embedded in the inner wall of the matrix adjacent said stones.
- a core bit comprising in combination a bit blank, an annular matrix cast within the blank, cutting stones embedded in the inner wall of the matrix, and a preformed hard metal ring embedded in the inner wall 01' the matrix adjacent said stones.
- a core bit comprising in combination a hollow bit blank, locking shoulders formed on the interior of the'head oi. the bit blank, the wall 01! the bit blank being provided with locking apertures, a cast matrix within the bit blank and held against dislodgment by said shoulders and apertures and cutting stones embedded in the face of said matrix.
- a core bit comprising in combination a hollow bit blank, the head of which is outwardly flared internally, and a diamond-carrying annular matrix cast within the flared portion of the bit blank.
- a core bit comprising in combination a hollow bit blank, the head of which is outwardly flared internally, said flared portion of the blank being provided with looking shoulders, a matrix cast within the outwardly flared head of the blank, and held therein by said locking shoulders, and cutting stones embedded in the outer end of the matrix.
- a core bit comprising in combination a hollow bit blank, the head of which is outwardly flared internally, said flared portion 01 the blank being provided with looking shoulders, a matrix cast within the outwardly flared head of the-blank and held therein by the said locking shoulders, cutting stones embedded in the outer end of the matrix, and a metal ring of a metal harder than the matrix embedded in the matrix interiorly thereof.
- a core "bit comprising in combination a bit blank, a cast matrix with cutting stones embedded therein carried by the bit blank, and a preformed ring of a material harder than the material of the matrix embedded in the matrix interiorly thereof.
- a core bit comprising in combination a bit blank, a matrix, provided by a cast metal annulus and having cutting stones embedded in its outer face and in its inner wall, secured to said bit blank, and a preformed ring of a metal harder than that of the matrix embedded in the inner wall of the matrix adjacent the outer end of the matrix and constituting a lining ring for the matrix.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Description
c. L. HEATH ET AL Oct. 3, 1939. Q
' Q DIAMOND BIT Filed Jan. 12, 1939 g g I gvENToRs BY M 6% MW ATTORNEY S Patented Oct. 3, 1939 I UNITED STATES PATENT OFFICE DIAMOND BIT Application January 12, 1939, Serial No. 250,469
9 Claims.
Our invention is directed to improvements in diamond bits and has for one of its objects the provision of a diamond bit of improved con struction.
Diamond core bits as heretofore constructed have consisted of a bit blank with an alloy cast on the exterior of the end of the same, the face of this casting or matrix being studded with cutting stones, such as commercial diamonds, which are embedded in the .alloy in the casting operation, and provide the cutting face or surface of the bit. The bit is hollow and the inner wall of the annular member or matrix, adjacent the outer end thereof, is lined with cutting stones also. In the manufacture of such bits the diamonds and the bit blank are set up in a suitable mold and molten metal flowed into the mold. In order that the diamonds may not be.
injured in the casting operation it is necessary to employ a metal or alloy for the matrix which has a relatively low melting point, that is, a melting point below that of steel, for example. While this protects the diamonds from being injured in the casting operation, it necessitates the use of a relatively soft metal for the matrix, so that when the bit is in use the core of the ore being drilled, as it passes through the bit, wears away the matrix and undercuts the diamonds, so that they become dislodged. This defect is well recognized by those familiar with this art and is overcome by our invention.
Broadly speaking, our invention provides a core bit wherein that part of the bit which previously is readily undercut is of a hard metal, thereby providing a bit which has a much longer life than prior bits and in which the diamonds are not readily dislodged.
We have shown an embodiment of our invention in the accompanying drawing, in which:
Fig. 1 is a sectional elevational view of the bit; and
Fig. 2 is an exploded view of the bit blank and hard metal ring entering into our construction.
Referring to the drawing in detail: 2 designates the bit blank. This bit blank may be of steel or other metal desired. The shank of the bit blank is threaded, as shown at l, as is usual.
The head of this bit blank is flared internally, as seen at 6, and this flared interior is provided with locking shoulders 8. The wall of the head of the bit blank is provided with apertures in which also function as locks, as will be brought out hereinafter.
Within the flared portion of the head of the bit blank is the matrix i2 for the diamonds ll or other cutting elements. The matrix, as will be understood, is an annulus, and the cutting elements I are not only disposed inthe face of this annulus but about the inner wall of the annulus adjacent the workingface or forward end of the bit, as shown at IS. The matrix I2, which is a casting, is composed of any of the metals or alloys commonly employed in the diamond bit industry.
Adjacent the mouth or forward end of the bit, we provide a preformed hard metal ring i8, for example, a. steel ring. This ring is embedded in the matrix l2 and lies Just within the end of the matrix just above the cutting stones IS with which the mouth of the bit is provided, as above explained.
In manufacturing our bit, the bit blank 2, the ring I! and the stones ll are assembled in a suitable mold, and the metal of the matrix I! poured thereinto, the metal flowing about the cutting stones and about the hard metal ring i8 to embed the same. It will be appreciated, also, that the metal flows into the locking apertures l0 and that these together with the locking shoulders 8 securely lock the matrix to the bit blank.
It will be appreciated from all of the foregoing that the preformed hard metal ring l8 will reinforce the matrix and prevent undercutting and dislodgment of the diamonds or other cutting elements, when the bit is being used, the core of the ore being drilled, as the same passes through the hollow matrix, being kept out of contact with the matrix adjacent the nose of the bit by the ring.
It is to be understood that changes may be made in the details of construction and arrangement of parts above described without departing from the spirit and scope of our invention.
What we claim is:
1. A core bit comprising in combination a bit blank, a matrix in the form of an annulus carried by the bit blank, cutting stones in the face of the matrix, and a preformed hard metal ring embedded in theinner wall of the matrix adjacent the working face of the bit.
2. A core bit comprising in combination a bit blank. a matrix in the form of an annulus carried within the blank, cutting stones in the inner wall of the matrix. and a preformed hard metal ring embedded in the inner wall of the matrix adjacent said stones.
3. A core bit comprising in combination a bit blank, an annular matrix cast within the blank, cutting stones embedded in the inner wall of the matrix, and a preformed hard metal ring embedded in the inner wall 01' the matrix adjacent said stones.
4. A core bit comprising in combination a hollow bit blank, locking shoulders formed on the interior of the'head oi. the bit blank, the wall 01! the bit blank being provided with locking apertures, a cast matrix within the bit blank and held against dislodgment by said shoulders and apertures and cutting stones embedded in the face of said matrix.
5.. A core bit comprising in combination a hollow bit blank, the head of which is outwardly flared internally, and a diamond-carrying annular matrix cast within the flared portion of the bit blank.
6. A core bit comprising in combination a hollow bit blank, the head of which is outwardly flared internally, said flared portion of the blank being provided with looking shoulders, a matrix cast within the outwardly flared head of the blank, and held therein by said locking shoulders, and cutting stones embedded in the outer end of the matrix.
7. A core bit comprising in combination a hollow bit blank, the head of which is outwardly flared internally, said flared portion 01 the blank being provided with looking shoulders, a matrix cast within the outwardly flared head of the-blank and held therein by the said locking shoulders, cutting stones embedded in the outer end of the matrix, and a metal ring of a metal harder than the matrix embedded in the matrix interiorly thereof.
8. A core "bit comprising in combination a bit blank, a cast matrix with cutting stones embedded therein carried by the bit blank, and a preformed ring of a material harder than the material of the matrix embedded in the matrix interiorly thereof.
9. A core bit comprising in combination a bit blank, a matrix, provided by a cast metal annulus and having cutting stones embedded in its outer face and in its inner wall, secured to said bit blank, and a preformed ring of a metal harder than that of the matrix embedded in the inner wall of the matrix adjacent the outer end of the matrix and constituting a lining ring for the matrix.
CLARENCE L. HEATH. ELLSWOR'I'H B. SHERWOOD.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US250469A US2174980A (en) | 1939-01-12 | 1939-01-12 | Diamond bit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US250469A US2174980A (en) | 1939-01-12 | 1939-01-12 | Diamond bit |
Publications (1)
Publication Number | Publication Date |
---|---|
US2174980A true US2174980A (en) | 1939-10-03 |
Family
ID=22947878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US250469A Expired - Lifetime US2174980A (en) | 1939-01-12 | 1939-01-12 | Diamond bit |
Country Status (1)
Country | Link |
---|---|
US (1) | US2174980A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2506216A (en) * | 1946-12-24 | 1950-05-02 | Albert B Hemstreet | Self-locking centrifugal mold |
US2633682A (en) * | 1950-10-14 | 1953-04-07 | Eastman Oil Well Survey Co | Milling bit |
US3016662A (en) * | 1958-09-11 | 1962-01-16 | Micromatic Hone Corp | Ball honing tool |
US3301645A (en) * | 1962-04-03 | 1967-01-31 | Exxon Production Research Co | Tungsten carbide compositions, method and cutting tool |
US3757879A (en) * | 1972-08-24 | 1973-09-11 | Christensen Diamond Prod Co | Drill bits and methods of producing drill bits |
US3934662A (en) * | 1973-08-29 | 1976-01-27 | Bakerdrill, Inc. | Core bit |
US20110174546A1 (en) * | 2008-08-15 | 2011-07-21 | Sandvik Intellectual Property Ab | Core drill bit |
-
1939
- 1939-01-12 US US250469A patent/US2174980A/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2506216A (en) * | 1946-12-24 | 1950-05-02 | Albert B Hemstreet | Self-locking centrifugal mold |
US2633682A (en) * | 1950-10-14 | 1953-04-07 | Eastman Oil Well Survey Co | Milling bit |
US3016662A (en) * | 1958-09-11 | 1962-01-16 | Micromatic Hone Corp | Ball honing tool |
US3301645A (en) * | 1962-04-03 | 1967-01-31 | Exxon Production Research Co | Tungsten carbide compositions, method and cutting tool |
US3757879A (en) * | 1972-08-24 | 1973-09-11 | Christensen Diamond Prod Co | Drill bits and methods of producing drill bits |
US3934662A (en) * | 1973-08-29 | 1976-01-27 | Bakerdrill, Inc. | Core bit |
US20110174546A1 (en) * | 2008-08-15 | 2011-07-21 | Sandvik Intellectual Property Ab | Core drill bit |
US8684111B2 (en) * | 2008-08-15 | 2014-04-01 | Sandvik Intellectual Property Ab | Core drill bit |
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