US3918538A - Rotary percussion earth boring bit - Google Patents
Rotary percussion earth boring bit Download PDFInfo
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- US3918538A US3918538A US484838A US48483874A US3918538A US 3918538 A US3918538 A US 3918538A US 484838 A US484838 A US 484838A US 48483874 A US48483874 A US 48483874A US 3918538 A US3918538 A US 3918538A
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- inserts
- bevel
- outer row
- row
- lower region
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- 238000009527 percussion Methods 0.000 title claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000006872 improvement Effects 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 abstract description 21
- 230000001154 acute effect Effects 0.000 abstract description 4
- 230000035939 shock Effects 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 238000005452 bending Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 101000635799 Homo sapiens Run domain Beclin-1-interacting and cysteine-rich domain-containing protein Proteins 0.000 description 1
- 102100030852 Run domain Beclin-1-interacting and cysteine-rich domain-containing protein Human genes 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007704 transition Effects 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
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
-
- 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
- E21B10/36—Percussion drill bits
- E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
-
- 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
- E21B10/36—Percussion drill bits
- E21B10/40—Percussion drill bits with leading portion
-
- 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
- E21B10/56—Button-type inserts
Definitions
- ABSTRACT Disclosed herein is a rotary-percussion earth boring bit that has an improved geometric configuration to extend cutting insert life and reduce cutting insert breakage.
- the bottom surface contains a flat transverse face with a bevelled edge.
- Two rows of circumferentially spaced cutting inserts protrude from the bevel.
- One of the rows is spaced inwardly from an outer row to define an inner row. which has inserts positioned between the circumferentially spaced inserts of the outer row.
- the longitudinal axes of these inserts are substantially perpendicular to the bevel and inclined outward at an acute angle to the axis of rotation of the bit.
- a generally longitudinally' extending groove is formed between each two adjacent inserts of the outer row. This arrangement produces a symmetry that tends to minimize the number of reflective surfaces. This equalizes the stresses generated by the impact induced shock waves transmitted through the bit.
- gage or outer row inserts which have a greater circumference to travel than the inner row inserts on each revolution of the bit. Greater forces are exerted on the outer row of inserts, for in addition to the vertical compressive inserts on the inner portions of the bit serve their useful longitudinal axes substantially perpendicular to the bevel. Between each of the outer rows of these inserts. generally longitudinal grooves for cuttings return are formed. The inner row of inserts located on the bevel are spaced inwardly and between the outer row.
- the outer row inserts are also more likely to be pulled from the support metal of the body bylarge radial tearing forces.
- the outer inserts protrude beyond the enlarged lower region of the bit to avoid excessive wear on the lower region surface and wedging. Because the outer inserts are close to the periphery of the bit. support metal is thin in this area. This leads to rupture of the support metal near the periphery.
- One of the objects of this invention is to provide an improved geometric configuration fora rotary-percussion earth-boring bit such that the outer row inserts are positioned to better withstand vertical. lateral. and radial forces. Another object is to provide the outer row inserts with additional supporting metal. Another object is to provide a bevel at the corner between the transverse base and lower region to increase stability and facilitate cuttings removal. Another object is to provide larger equally spaced generally longitudinal grooves to facilitate cuttings removal. Another object is to minimize abrupt changes in adjacent transverse cross sections through utilization of a configuration that approaches symmetry as close as practicable near the outer periphery of the bit.
- the body of the bit has torque transmission means such as splines and an upper anvil surface to receive successive impacts from a fluid operated hammer.
- torque transmission means such as splines and an upper anvil surface to receive successive impacts from a fluid operated hammer.
- An enlarged lower region witha transverse face, containing button type inserts, is formed on the bit. and the body is formed of a single mass of metal.
- a bevel is formed at the corner of the enlarged lower'region and the transverse face.
- the bevel contains two circumferentially and alternately the bit. Cuttings return flow is increased because of larger and uniform cuttings return grooves.
- FIG. 1 is ape'rspective view as seen looking obliquely from a corner on the lower region of the bit body to show the preferred relationship of the transverse face of the bit with the button type inserts and the bevel.
- FIG. 2 is a longitudinal cross-sectionview of the bit shown in FIG. 1, except some inserts have been moved to show their relative' paths on the borehole bottom during rotation of the bit.
- FIG. 3 is a'bottom view of the bit shown in FIG. 1.
- FIG. 4 is a top view of the bit shown in FIG. 1.
- a rotary percussion type earth boring bit is shown in perspective and includes a torque transmission means that includes splines ll, 13. These splines are adapted to be assembled with mating splines in the housing (not shown) of a motorlhaving a fluid driven reciprocating piston that periodically engages an anvil upper surface 17 of the bit. It is conventional for a split-ring (not shown) to be assembled around a cylindrical surface 15 to engage shoulders in the housing and retain the bit for reciprocation in the housing and rotation with the housing. Such arrangements are well known in the art and the invention isnot limited to use with any particular form of housing or motor. 1
- the bit also includes an enlarged lower region 18 that terminates in a transverse face 19 containing a plurality of button type inserts 21.
- button type insert refers to those wear resistent inserts described in the previously mentioned U.S. Pat. No. 3.185.228. Commonly. such inserts are constructed of sintered tungsten carbide and are well known in the art.
- the bottom surface of the bit includes a flat transverse face 19 and bevel 35.
- the bevel may be formed as a frusto-conical surface at the corner of the transverse face 19 and enlarged lower region 18.
- it may cumferentially spaced inserts 31.
- Each of the inserts 31, 33 protrudes from the bevel 35, being inserted in machined holes with interference fit in the manner well known in the art.
- the longitudinal axes of the inserts 3 31. 33 are substantially perpendicular to the surface of the bevel 35. Since the bevel 35 is substantially flat or only slightly curved. the longitudinal axes ofthe inserts 31. 33 form substantially the same acute angle with respect to the axis of revolution of the bit.
- the remaining inserts 21 are distributed on the transverse face 19 to cooperatively cover. during rotation. the borehole bottom as indicated in HQ. 2.
- the body of the bit is preferably constructed of a single mass of metal through which a single air course 23 extends obliquely from the anvil surface 17 until it intersects the transverse face 19.
- the center of the resulting aperture on the transverse face 19 is offset from the axis of revolution or centerline of the bit so that an innermost insert can effectively remove earth from the center region of the borehole bottom.
- the invention solves the problem of how and where to place more inserts to alleviate work and stress required of the outer row inserts 31, without reducing the support metal section. Placing an inner row of inserts 33 radially in-line with the outer row of inserts 31 was not feasible since this led to loss of section of the supporting metal. Staggering an inner row of inserts 33 between the outer row 31 and at a different angle resulted in reduction in the size ofcuttings return grooves 37. Also. having outer and inner row inserts at different angles caused reduction in section of the support metal between inserts.
- An improved geometric configuration for a rotarypercussion earth-boring bit that includes a body having torque transmission means on an upper region. an anvil upper surface and an enlarged lower region with a transverse face containing button type inserts, the improvement comprising:
- the inserts of the inner and outer rows having longitudinal axes that are substantially normal to the bevel.
- An improved geometric configuration for a rotarypercussion earth-boring bit that includes a body having torque transmission means on an upper region, an anvil upper surface and an enlarged lower region with a transverse face containing button type inserts, the improvement comprising:
- An improved geometric configuration for a rotarypercussion earth-boring bit that includes a body having torque transmission means on an upper region, an anvil upper surface and an enlarged lower region with a transverse face containing button type inserts, the improvemenl comprising:
- a l'rusto-eonieal bevel formed at the corner between the transverse face and the enlarged lower region.
- the inserts ofthe inner and outer rows having longitudinal axes that are substantially perpendicular to the bevel.
- An improved geometric configuration for a rotarypereussion earth-boring bit that includes a body having torque transmission means on an upper region, an anvil upper surface and an enlarged lower region with a LII 6 transverse laee containing button type inserts. the improvement comprising:
- a l'rusto-eonical bevel formed at the corner between the transverse face and the enlarged lowerregion: an outer row of eircumferentially and substantially spaced inserts protruding [from said bevel; an inner row of eircumferentially and substantially equally spaced inserts located inwardly on said bevel and between the eircumferentially spaced inserts of the outer row; the inserts ol'the inner and outer rows having longitudinal axes that are substantially perpendicular to the bevel; a longitudinally extending groove formed in enlarged lower region between each of the inserts of the outer row.
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- 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)
Abstract
Disclosed herein is a rotary-percussion earth boring bit that has an improved geometric configuration to extend cutting insert life and reduce cutting insert breakage. The bottom surface contains a flat transverse face with a bevelled edge. Two rows of circumferentially spaced cutting inserts protrude from the bevel. One of the rows is spaced inwardly from an outer row to define an inner row, which has inserts positioned between the circumferentially spaced inserts of the outer row. The longitudinal axes of these inserts are substantially perpendicular to the bevel and inclined outward at an acute angle to the axis of rotation of the bit. A generally longitudinally extending groove is formed between each two adjacent inserts of the outer row. This arrangement produces a symmetry that tends to minimize the number of reflective surfaces. This equalizes the stresses generated by the impact induced shock waves transmitted through the bit.
Description
i United States Patent [191 Bender [451 Nov. 11, 1975 41 ROTARY PERCUSSION EARTH BORING BIT [75] Inventor: Mark Leslie Bender, Pearland, Tex.
[73] Assignee: Hughes Tool Company, Houston,
Tex.
[22] Filed: July 1, 1974 [21] Appl. No.: 484,838
[52] US. Cl 175/410; 175/417 [51] Int. C1. E2lC 13/01 [58] Field of Search 175/393, 395, 407, 410, 175/415, 417, 418, 419, 420, 421, 231, 92,
[56] References Cited UNITED STATES PATENTS 3,158,216 11/1964 Baron et a1. 175/410 X 3,185,228 5/1965 Kell) 1 .1 175/415 X 3,269,470 8/1966 Kelly... 175/410 3,357,507 12/1967 Stewart 175/418 X 3,388,756 6/1968 Varel et 211.... 175/418 X 3,537,538 11/1970 AClCOCk 175/413 3,583,504 6/1971 Aalund 1 .1 175/410 3,717,209 2/1973 Sheldon et a1. 175/413 3,858,671 l/l975 Kita et a1. 175/406 Primal" E.\'aminerFrank L. Abbott Assistant Etanziner-Richard 1E. Favreau Anornev, Agent, or FirmRobert A. Felsman [57 7 ABSTRACT Disclosed herein is a rotary-percussion earth boring bit that has an improved geometric configuration to extend cutting insert life and reduce cutting insert breakage. The bottom surface contains a flat transverse face with a bevelled edge. Two rows of circumferentially spaced cutting inserts protrude from the bevel. One of the rows is spaced inwardly from an outer row to define an inner row. which has inserts positioned between the circumferentially spaced inserts of the outer row. The longitudinal axes of these inserts are substantially perpendicular to the bevel and inclined outward at an acute angle to the axis of rotation of the bit. A generally longitudinally' extending groove is formed between each two adjacent inserts of the outer row. This arrangement produces a symmetry that tends to minimize the number of reflective surfaces. This equalizes the stresses generated by the impact induced shock waves transmitted through the bit.
4 Claims, 4 Drawing Figures US. Patent Nov. 11, 1975 ROTARY PERCUSSION EARTH BORING BIT BACKGROUND OF THE INVENTION 1. Field ofthe Invention This invention relates in general to improved rotary percussion earth boring ,bits and in particularto improvements in the geometric relationship of the lower region of the bit and cutting inserts.
2. Description of the Prior Art The first known commercially successful rotary-perspaced, rows of inserts protruding outward with their cussion earth boring bit of the type having button inlife.
There are several explanations that.may explain the variation between gage and inner row insert life. A
greater amount of material, must be cut by the gage or outer row inserts. which have a greater circumference to travel than the inner row inserts on each revolution of the bit. Greater forces are exerted on the outer row of inserts, for in addition to the vertical compressive inserts on the inner portions of the bit serve their useful longitudinal axes substantially perpendicular to the bevel. Between each of the outer rows of these inserts. generally longitudinal grooves for cuttings return are formed. The inner row of inserts located on the bevel are spaced inwardly and between the outer row.
Consequently the inner row leads the outer row in cutting the bottom ofthe borehole to form a somewhat conical bottom hole pattern. This increases the life of the inserts. Breakage is reduced because the lateral forces are sharedbetween more inserts. The section of support metal for each insert is increased because the longitudinal axes of inner and outer rows form substantially the same angle with respect to the vertical axis of forces. large lateral forces occur. resulting from thecutting of the sides of the borehole. The typically used tungsten carbide insert will withstand great compressive forces. but not great lateral or bending forces. thus breakage is more likely.
The outer row inserts are also more likely to be pulled from the support metal of the body bylarge radial tearing forces. The outer inserts protrude beyond the enlarged lower region of the bit to avoid excessive wear on the lower region surface and wedging. Because the outer inserts are close to the periphery of the bit. support metal is thin in this area. This leads to rupture of the support metal near the periphery.
A number of solutions to the problems of wear. breakage. and tearing for the outer row and their supporting metal have been proposed. However. improvements in the bit life are still needed.
SUMMARY OF THE iNvENTioN One of the objects of this invention is to provide an improved geometric configuration fora rotary-percussion earth-boring bit such that the outer row inserts are positioned to better withstand vertical. lateral. and radial forces. Another object is to provide the outer row inserts with additional supporting metal. Another object is to provide a bevel at the corner between the transverse base and lower region to increase stability and facilitate cuttings removal. Another object is to provide larger equally spaced generally longitudinal grooves to facilitate cuttings removal. Another object is to minimize abrupt changes in adjacent transverse cross sections through utilization of a configuration that approaches symmetry as close as practicable near the outer periphery of the bit.
In accordance with these objects. the body of the bit has torque transmission means such as splines and an upper anvil surface to receive successive impacts from a fluid operated hammer. An enlarged lower region witha transverse face, containing button type inserts, is formed on the bit. and the body is formed of a single mass of metal. At the corner of the enlarged lower'region and the transverse face; a bevel is formed. The bevel contains two circumferentially and alternately the bit. Cuttings return flow is increased because of larger and uniform cuttings return grooves. Other objects, features and advantages will become apparent hereinafter.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is ape'rspective view as seen looking obliquely from a corner on the lower region of the bit body to show the preferred relationship of the transverse face of the bit with the button type inserts and the bevel.
FIG. 2 is a longitudinal cross-sectionview of the bit shown in FIG. 1, except some inserts have been moved to show their relative' paths on the borehole bottom during rotation of the bit.
FIG. 3 is a'bottom view of the bit shown in FIG. 1.
FIG. 4 is a top view of the bit shown in FIG. 1.
DESCRIPTION OF TI'IE PREFERRED EMBODIMENT Referring initially to FIG. 1 of the drawing. a rotary percussion type earth boring bit is shown in perspective and includes a torque transmission means that includes splines ll, 13. These splines are adapted to be assembled with mating splines in the housing (not shown) of a motorlhaving a fluid driven reciprocating piston that periodically engages an anvil upper surface 17 of the bit. It is conventional for a split-ring (not shown) to be assembled around a cylindrical surface 15 to engage shoulders in the housing and retain the bit for reciprocation in the housing and rotation with the housing. Such arrangements are well known in the art and the invention isnot limited to use with any particular form of housing or motor. 1
The bit also includes an enlarged lower region 18 that terminates in a transverse face 19 containing a plurality of button type inserts 21. The term button type insert" refers to those wear resistent inserts described in the previously mentioned U.S. Pat. No. 3.185.228. Commonly. such inserts are constructed of sintered tungsten carbide and are well known in the art.
The bottom surface of the bit includes a flat transverse face 19 and bevel 35. The bevel may be formed as a frusto-conical surface at the corner of the transverse face 19 and enlarged lower region 18. However. it may cumferentially spaced inserts 31. Each of the inserts 31, 33 protrudes from the bevel 35, being inserted in machined holes with interference fit in the manner well known in the art. The longitudinal axes of the inserts 3 31. 33 are substantially perpendicular to the surface of the bevel 35. Since the bevel 35 is substantially flat or only slightly curved. the longitudinal axes ofthe inserts 31. 33 form substantially the same acute angle with respect to the axis of revolution of the bit. The remaining inserts 21 are distributed on the transverse face 19 to cooperatively cover. during rotation. the borehole bottom as indicated in HQ. 2.
The body of the bit is preferably constructed of a single mass of metal through which a single air course 23 extends obliquely from the anvil surface 17 until it intersects the transverse face 19. The center of the resulting aperture on the transverse face 19 is offset from the axis of revolution or centerline of the bit so that an innermost insert can effectively remove earth from the center region of the borehole bottom.
It should be apparent from the foregoing description that an invention having significant advantages has been provided. The invention solves the problem of how and where to place more inserts to alleviate work and stress required of the outer row inserts 31, without reducing the support metal section. Placing an inner row of inserts 33 radially in-line with the outer row of inserts 31 was not feasible since this led to loss of section of the supporting metal. Staggering an inner row of inserts 33 between the outer row 31 and at a different angle resulted in reduction in the size ofcuttings return grooves 37. Also. having outer and inner row inserts at different angles caused reduction in section of the support metal between inserts.
Prior art solutions placed the inner row of inserts 33 in a substantially vertical position or lesser angle of inclination than the outer row 31, which inclined outwardly to cut the side of the borehole. The reason for the differing angles of inclination was to align the longitudinal axes of the inserts 31, 33 substantially in the direction of the resultant of the lateral forces from the side of the borehole. Thus it was thought that to align the innerrow 33 -outwardly at the same acute angle would subject it to too much bending force from the vertical direction.
Placing the inner inserts 33 substantially vertical or at a lesser angle of inclination than outer inserts 31 may have placed their longitudinal axes more in line with the differing resultant forces. however it deprived both rows 31, 33 of needed support section. It is desirable to place inserts 33 as close to the cuttings return groove 37 as possible to share the work load of outer inserts 31. But because the longitudinal axes of the inner inserts 33 were near vertical. the base 39 was also close to return groove 37 and support section was reduced, leaving support only on the inward periphery. Also. as the phantom lines designating bases 39, 41 in FIG. 2 show. if adjacent inserts incline at different angles. the phantom lines intersect. Less body section is available to resist radial tearing forces than if the phantom lines do not intersect as bases 39 and 43. Further outward. on base 43, the radial force is greater than on base 41. requiring more section for support.
The use of a bevel 35 with inner and outer rows 31, 33 protruding outward from it at substantially the same angles of inclination with respect to the bit axis of revolution solves the problem. The work load of the outer row 31 is reduced, body support section is sufficient, yet cuttings return grooves 37 are increased in area. The inner row 33 leads the outer row 31 in cutting portions of the side ofthe borehole. This reduces the work required of the outer row 31 and shares in lateral forces. The resultant forces acting on each row 31. 33 are not precisely in the same direction. yet because the rows 31. 33 are perpendicular to the surface of bevel 35. they are able to withstand bending forces. Because of the outward inclination. the cutting tips of inserts 33 are on the periphery of the bit where they are needed. yet their bases 39 are inward where there is sufficient body section for support. Large cutting return grooves 37 are possible because of the inward placement of base 39.
Furthermore. the use ofa large bevel 35 gives greater bit stability because of the partial cone-shaped uncut bottom of the borehole. Cutting chip removal is more effective because of the gradual transition from the horizontal borehole bottom to the vertical borehole sides. Flat chips cut from the bottom of the borehole will not clog when they change directions from horizontal to vertical on being carried outward and upward. Because the return flow air is large and uniform, large cutting chips can be removed quickly. thus avoiding inefficient cuttings regrinding.
While this invention has been shown in only one of its forms, it should be apparent to those skilled in the art that it is not so limited but is susceptible to various changes and modifications without departing from the spirit thereof.
1 claim:
1. An improved geometric configuration for a rotarypercussion earth-boring bit that includes a body having torque transmission means on an upper region. an anvil upper surface and an enlarged lower region with a transverse face containing button type inserts, the improvement comprising:
a bevel formed at the corner between the transverse face and the enlarged lower region;
an outer row of circumferentially spaced inserts protruding from said bevel;
an inner row of circumferentially spaced inserts located inwardly wholly on said bevel and between the circumferentially spaced inserts of the outer row;
the inserts of the inner and outer rows having longitudinal axes that are substantially normal to the bevel.
2. An improved geometric configuration for a rotarypercussion earth-boring bit that includes a body having torque transmission means on an upper region, an anvil upper surface and an enlarged lower region with a transverse face containing button type inserts, the improvement comprising:
a bevel formed at the corner between the transverse face and the enlarged lower region;
an outer row of circumferentially spaced inserts protruding from said bevel;
an inner row of circumferentially spaced inserts located inwardly on said bevel and between the circumferentially spaced inserts of the outer row;
the inserts of the inner and outer rows having longitudinal axes that are substantially normal to the bevel;
a longitudinally extending groove formed in the enlarged lower region between each two adjacent circumferentially spaced inserts of the outer row.
3. An improved geometric configuration for a rotarypercussion earth-boring bit that includes a body having torque transmission means on an upper region, an anvil upper surface and an enlarged lower region with a transverse face containing button type inserts, the improvemenl comprising:
a l'rusto-eonieal bevel formed at the corner between the transverse face and the enlarged lower region. an outer row of eireuml'erentially and substantially spaced inserts protruding from said bevel:
an inner row of eireumferentially and substantially equally spaced inserts located inwardly wholly on said bevel and between the circumferentially spaced inserts of the outer row:
the inserts ofthe inner and outer rows having longitudinal axes that are substantially perpendicular to the bevel.
4. An improved geometric configuration for a rotarypereussion earth-boring bit that includes a body having torque transmission means on an upper region, an anvil upper surface and an enlarged lower region with a LII 6 transverse laee containing button type inserts. the improvement comprising:
a l'rusto-eonical bevel formed at the corner between the transverse face and the enlarged lowerregion: an outer row of eircumferentially and substantially spaced inserts protruding [from said bevel; an inner row of eircumferentially and substantially equally spaced inserts located inwardly on said bevel and between the eircumferentially spaced inserts of the outer row; the inserts ol'the inner and outer rows having longitudinal axes that are substantially perpendicular to the bevel; a longitudinally extending groove formed in enlarged lower region between each of the inserts of the outer row.
Claims (4)
1. An improved geometric configuration for a rotary-percussion earth-boring bit that includes a body having torque transmission means on an upper region, an anvil upper surface and an enlarged lower region with a transverse face containing button type inserts, the improvement comprising: a bevel formed at the corner between the transverse face and the enlarged lower region; an outer row of circumferentially spaced inserts protruding from said bevel; an inner row of circumferentially spaced inserts located inwardly wholly on said bevel and between the circumferentially spaced inserts of the outer row; the inserts of the inner and outer rows having longitudinal axes that are substantially normal to the bevel.
2. An improved geometric configuration for a rotary-percussion earth-boring bit that includes a body having torque transmission means on an upper region, an anvil upper surface and an enlarged lower region with a transverse face containing button type inserts, the improvement comprising: a bevel formed at the corner between the transverse face and the enlarged lower region; an outer row of circumferentially spaced inserts protruding from said bevel; an inner row of circumferentially spaced inserts located inwardly on said bevel and between the circumferentially spaced inserts of the outer row; the inserts of the inner and outer rows having longitudinal axes that are substantially normal to the bevel; a longitudinally extending groove formed in the enlarged lower region between each two adjacent circumferentially spaced inserts of the outer row.
3. An improved geometric configuration for a rotary-percussion earth-boring bit that includes a body having torque transmission means on an upper region, an anvil upper surface and an enlarged lower region with a transverse face containing button type inserts, the improvement comprising: a frusto-conical bevel formed at the corner between the transverse face and the enlarged lower region; an outer row of circumferentially and substantially spaced inserts protruding from said bevel; an inner row of circumferentially and substantially equally spaced inserts located inwardly wholly on said bevel and between the circumferentially spaced inserts of the outer row; the inserts of the inner and outer rows having longitudinal axes that are substantially perpendicular to the bevel.
4. An improved geometric configuration for a rotary-percussion earth-boring bit that includes a body having torque transmission means on an Upper region, an anvil upper surface and an enlarged lower region with a transverse face containing button type inserts, the improvement comprising: a frusto-conical bevel formed at the corner between the transverse face and the enlarged lower region; an outer row of circumferentially and substantially spaced inserts protruding from said bevel; an inner row of circumferentially and substantially equally spaced inserts located inwardly on said bevel and between the circumferentially spaced inserts of the outer row; the inserts of the inner and outer rows having longitudinal axes that are substantially perpendicular to the bevel; a longitudinally extending groove formed in enlarged lower region between each of the inserts of the outer row.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US484838A US3918538A (en) | 1974-07-01 | 1974-07-01 | Rotary percussion earth boring bit |
CA219,080A CA1003399A (en) | 1974-07-01 | 1975-01-30 | Rotary percussion earth boring bit |
JP1975019352U JPS5413362Y2 (en) | 1974-07-01 | 1975-02-13 | |
ZA00752960A ZA752960B (en) | 1974-07-01 | 1975-05-07 | Rotary percussion earth boring bit |
AU81058/75A AU8105875A (en) | 1974-07-01 | 1975-05-12 | Rotary percussion earth boring bit |
GB22377/75A GB1507163A (en) | 1974-07-01 | 1975-05-22 | Rotary percussion earth boring bit |
SE7506485A SE7506485L (en) | 1974-07-01 | 1975-06-06 | DEVICE FOR ROTARY STOT DRILL FOR EARTH DRILLING. |
US05/719,204 USRE29300E (en) | 1974-07-01 | 1976-08-30 | Rotary percussion earth boring bit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US484838A US3918538A (en) | 1974-07-01 | 1974-07-01 | Rotary percussion earth boring bit |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/719,204 Reissue USRE29300E (en) | 1974-07-01 | 1976-08-30 | Rotary percussion earth boring bit |
Publications (1)
Publication Number | Publication Date |
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US3918538A true US3918538A (en) | 1975-11-11 |
Family
ID=23925829
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US484838A Expired - Lifetime US3918538A (en) | 1974-07-01 | 1974-07-01 | Rotary percussion earth boring bit |
US05/719,204 Expired - Lifetime USRE29300E (en) | 1974-07-01 | 1976-08-30 | Rotary percussion earth boring bit |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/719,204 Expired - Lifetime USRE29300E (en) | 1974-07-01 | 1976-08-30 | Rotary percussion earth boring bit |
Country Status (7)
Country | Link |
---|---|
US (2) | US3918538A (en) |
JP (1) | JPS5413362Y2 (en) |
AU (1) | AU8105875A (en) |
CA (1) | CA1003399A (en) |
GB (1) | GB1507163A (en) |
SE (1) | SE7506485L (en) |
ZA (1) | ZA752960B (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4096917A (en) * | 1975-09-29 | 1978-06-27 | Harris Jesse W | Earth drilling knobby bit |
US4862976A (en) * | 1988-11-22 | 1989-09-05 | Sandvik Rock Tools, Inc. | Spline drive for percussion drilling tool |
US20010047890A1 (en) * | 1997-06-30 | 2001-12-06 | John Adams Meyers | Drill bit with large inserts |
WO2002052122A1 (en) * | 2000-12-21 | 2002-07-04 | Moe, Per Thomas | A method and drill bit for reducing the cuttings size to a predetermined maximum size |
EP2612981A1 (en) | 2012-01-09 | 2013-07-10 | Sandvik Intellectual Property AB | A drill bit for a percussive hammer, and shank and retention lug therefore |
CN104153710A (en) * | 2014-08-12 | 2014-11-19 | 江苏中油天工机械有限公司 | Drill bit of three-inclined-plane air hammer |
USD823908S1 (en) * | 2015-05-29 | 2018-07-24 | Atlas Copco Secoroc Ab | Rock drill bit |
USD861051S1 (en) * | 2018-03-13 | 2019-09-24 | Robit Oyj | Drill bit |
USD870168S1 (en) | 2018-03-13 | 2019-12-17 | Robit Oyj | Drill bit |
USD872142S1 (en) * | 2015-05-21 | 2020-01-07 | Center Rock Inc. | Drill bit for a down-the-hole drill hammer |
USD1009108S1 (en) * | 2020-09-21 | 2023-12-26 | Kyocera Unimerco Tooling A/S | Drill |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2366585A (en) * | 1997-06-30 | 2002-03-13 | Smith International | Improvements in or relating to drill bits |
US7527110B2 (en) * | 2006-10-13 | 2009-05-05 | Hall David R | Percussive drill bit |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3158216A (en) * | 1961-04-27 | 1964-11-24 | Inst Francais Du Petrole | High speed drill bit |
US3185228A (en) * | 1963-01-21 | 1965-05-25 | Hughes Tool Co | Rotary-percussion drill bit with heel row inserts to prevent wedging |
US3269470A (en) * | 1965-11-15 | 1966-08-30 | Hughes Tool Co | Rotary-percussion drill bit with antiwedging gage structure |
US3357507A (en) * | 1965-10-24 | 1967-12-12 | Mission Mfg Co | Percussion bit |
US3388756A (en) * | 1965-03-29 | 1968-06-18 | Varel Mfg Company | Percussion bit |
US3537538A (en) * | 1969-05-21 | 1970-11-03 | Christensen Diamond Prod Co | Impregnated diamond bit |
US3583504A (en) * | 1969-02-24 | 1971-06-08 | Mission Mfg Co | Gauge cutting bit |
US3717209A (en) * | 1971-06-10 | 1973-02-20 | Pacific Tooling & Eng Co | Replaceable wear-resistant element and method for replacing same |
US3858671A (en) * | 1973-04-23 | 1975-01-07 | Kennametal Inc | Excavating tool |
-
1974
- 1974-07-01 US US484838A patent/US3918538A/en not_active Expired - Lifetime
-
1975
- 1975-01-30 CA CA219,080A patent/CA1003399A/en not_active Expired
- 1975-02-13 JP JP1975019352U patent/JPS5413362Y2/ja not_active Expired
- 1975-05-07 ZA ZA00752960A patent/ZA752960B/en unknown
- 1975-05-12 AU AU81058/75A patent/AU8105875A/en not_active Expired
- 1975-05-22 GB GB22377/75A patent/GB1507163A/en not_active Expired
- 1975-06-06 SE SE7506485A patent/SE7506485L/en unknown
-
1976
- 1976-08-30 US US05/719,204 patent/USRE29300E/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3158216A (en) * | 1961-04-27 | 1964-11-24 | Inst Francais Du Petrole | High speed drill bit |
US3185228A (en) * | 1963-01-21 | 1965-05-25 | Hughes Tool Co | Rotary-percussion drill bit with heel row inserts to prevent wedging |
US3388756A (en) * | 1965-03-29 | 1968-06-18 | Varel Mfg Company | Percussion bit |
US3357507A (en) * | 1965-10-24 | 1967-12-12 | Mission Mfg Co | Percussion bit |
US3269470A (en) * | 1965-11-15 | 1966-08-30 | Hughes Tool Co | Rotary-percussion drill bit with antiwedging gage structure |
US3583504A (en) * | 1969-02-24 | 1971-06-08 | Mission Mfg Co | Gauge cutting bit |
US3537538A (en) * | 1969-05-21 | 1970-11-03 | Christensen Diamond Prod Co | Impregnated diamond bit |
US3717209A (en) * | 1971-06-10 | 1973-02-20 | Pacific Tooling & Eng Co | Replaceable wear-resistant element and method for replacing same |
US3858671A (en) * | 1973-04-23 | 1975-01-07 | Kennametal Inc | Excavating tool |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4096917A (en) * | 1975-09-29 | 1978-06-27 | Harris Jesse W | Earth drilling knobby bit |
US4862976A (en) * | 1988-11-22 | 1989-09-05 | Sandvik Rock Tools, Inc. | Spline drive for percussion drilling tool |
US20010047890A1 (en) * | 1997-06-30 | 2001-12-06 | John Adams Meyers | Drill bit with large inserts |
US6918455B2 (en) * | 1997-06-30 | 2005-07-19 | Smith International | Drill bit with large inserts |
WO2002052122A1 (en) * | 2000-12-21 | 2002-07-04 | Moe, Per Thomas | A method and drill bit for reducing the cuttings size to a predetermined maximum size |
WO2013104470A2 (en) | 2012-01-09 | 2013-07-18 | Sandvik Intellectual Property Ab | A drill bit for a percussive hammer, and shank therefore |
EP2612981A1 (en) | 2012-01-09 | 2013-07-10 | Sandvik Intellectual Property AB | A drill bit for a percussive hammer, and shank and retention lug therefore |
CN104153710A (en) * | 2014-08-12 | 2014-11-19 | 江苏中油天工机械有限公司 | Drill bit of three-inclined-plane air hammer |
USD872142S1 (en) * | 2015-05-21 | 2020-01-07 | Center Rock Inc. | Drill bit for a down-the-hole drill hammer |
USD823908S1 (en) * | 2015-05-29 | 2018-07-24 | Atlas Copco Secoroc Ab | Rock drill bit |
USD831714S1 (en) | 2015-05-29 | 2018-10-23 | Atlas Copco Secoroc Ab | Rock drill bit |
USD861051S1 (en) * | 2018-03-13 | 2019-09-24 | Robit Oyj | Drill bit |
USD870168S1 (en) | 2018-03-13 | 2019-12-17 | Robit Oyj | Drill bit |
USD1009108S1 (en) * | 2020-09-21 | 2023-12-26 | Kyocera Unimerco Tooling A/S | Drill |
Also Published As
Publication number | Publication date |
---|---|
JPS5413362Y2 (en) | 1979-06-07 |
AU8105875A (en) | 1976-11-18 |
CA1003399A (en) | 1977-01-11 |
ZA752960B (en) | 1976-04-28 |
SE7506485L (en) | 1976-01-02 |
USRE29300E (en) | 1977-07-12 |
JPS516103U (en) | 1976-01-17 |
GB1507163A (en) | 1978-04-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HUGHES TOOL COMPANY - USA A CORP OF DE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. SUBJECT TO LICENSE RECITED;ASSIGNOR:HUGHES TOOL COMPANY;REEL/FRAME:004269/0060 Effective date: 19840330 |
|
AS | Assignment |
Owner name: HUGHES TOOL COMPANY Free format text: CHANGE OF NAME;ASSIGNOR:HUGHES TOOL COMPANY-USA, A CORP. OF DE;REEL/FRAME:005169/0319 Effective date: 19881006 |