US2053801A - Rotary drilling bit - Google Patents
Rotary drilling bit Download PDFInfo
- Publication number
- US2053801A US2053801A US728114A US72811434A US2053801A US 2053801 A US2053801 A US 2053801A US 728114 A US728114 A US 728114A US 72811434 A US72811434 A US 72811434A US 2053801 A US2053801 A US 2053801A
- Authority
- US
- United States
- Prior art keywords
- bit
- face
- cutters
- holder
- head
- 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
- 238000005553 drilling Methods 0.000 title description 15
- 238000005520 cutting process Methods 0.000 description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 239000010432 diamond Substances 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 239000007779 soft material Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 239000010438 granite Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
Definitions
- My present invention relates to an improved rotary drilling bit of the core type, which bit while adapted for use in various ways, is especially designed for drilling blasting-holes employed in different forms of excavation work.
- the primary object of the invention is the provision of a highspeed rotary drill bit on which the diamond-cutters or stones are arranged in such manner as to insure maximum durability for the cutters with which the face of the bit is studded, and also to assure maximum efliciency for the bit in the performance of its functions of earth drilling or boring. 1
- the invention consists essentially in certain novel combinations andarrangements involving a bit having a threaded collar for attachment to the tubular drill-rod of a drilling machine, and in the hollow bit-head with its cutting-face and cutters located thereon, as will hereinafter be more fully set forth and claimed.
- a bit having a threaded collar for attachment to the tubular drill-rod of a drilling machine, and in the hollow bit-head with its cutting-face and cutters located thereon, as will hereinafter be more fully set forth and claimed.
- I have illustrated several forms of the invention, in which the bit is adapted for work in both hard and soft earth where excavations are to be made, but it will be understood that changes and alterations may be made in these exemplifying structures, within the scope of my claims without departing from the principles of my invention.
- Figure 1 is a side view of a bit embodying my invention, with the cutting stones or diamonds omitted for convenience of illustration; and Figure 2 is an enlarged detail sectional view of the bit.
- Figure 3 is a sectional view of a high speed bit adapted specially for use in comparatively soft earth, and involving my invention; and Figure 4 is a face of the bit of Figure 3.
- Figure 5 is a side view of another form of bit involving my invention, with the diamonds omitted; and Figure 6 is an enlarged detail sectional view of the bit of Figure 5 showing the replaceable orinterchangeable cutter-holder at the center of the bit.
- bit is adapted for boring or drilling in hard stone, granite and other hard materials; in Figures 3 and 4 the bit is especially adapted for boring or drilling in limestone, sandstone, and other soft stones, as well as in soft-earth; and in the bit of Figures 5 and 6 I illustrate particularly a removable and replaceable cutter holder by means of which the durability and usefulness of the bit is prolonged.
- the bit illustrated I employ a substantially rounded or convex head I having an integral, exterlorly threaded collar 2 by means of which the bit is threaded on the end of the usual tubular drill rod of a drilling machine.
- the front face 3 of the head is rounded or convexed, but not pointed, and the central portion of the face of the head is flattened or truncated.
- the head is hollow and is provided with an interior, comparatively large water chamber 4, which receives water under pressure from the tubular drill rod, and by means of the distributing ports 5 that open to the cutting face of the bit, water is fed in front of the rotating bit, for the purpose of carrying off the cuttings or dbris. These cuttings are subsequently disposed of and conveyed to the surface of the ground by the water flowing back through the drilled-hole around the outside of the tubular drill rod.
- the central cylindrical water chamber 4 is also open to the cutting face of the bit through a central port 6, which is countersunk or enlarged at l where it opens into the water chamber 4.
- an uncut core is fashioned at the center of the bottom of the drilled-hole. This core, if fashioned from soft earth or other soft material, is quickly broken into small particles which are scattered by the passage of the water under pressure to the face of the bit; if the bit is working in hard material, as granite, the uncut core may enter the central port 6 of the bit before being disintegrated, but
- the core is eventually crushed or broken into small bits which may be conveyed by the water under pressure through the several outlet ports for water, through and from the interior of the hollow bit.
- the flattened convex face of the head is provided with an inverted, cone-shaped recess 8, the annular wall of which flares outwardly from the central port 6 of the bit, and the wall of the recess merges with the face of the bit to form an annular shoulder between the convex portion and the concave portion of the face, as best seen in or revolves.
- cutters are located at the apex or central part of the convex face of the bit, these cutters bear the brunt of pressure applied to the bit, and, although these cutters turn at a slower surface speed than the cutters located at a distance from the center of the bit, the central cutters wear away more rapidly than the cutters having the greater surface speed. Therefore, by dispensing with the use of cutters at the center 'of the bit, the remaining cutters or diamonds, having a more uniformly faster surface speed, bear the brunt of the pressure, and the pressure is thus more evenly distributed for more nearly uniform wear on the cutters.
- FIGs 5 and 6 I illustrate the use of a removable cutter-holder or tubular insert I I having the water chamber 4, the central port 6 and countersunk hole I, and a recess 8' similar to the recess of Figure 2.
- This tubular cutter-holder may readily be fitted into the hollow bit, or removed therefrom when the cutters 9 on the face 8' become worn, and fresh cutters may be substituted for the worn cutters, or another holder with fresh cutters may be substituted for the used holder.
- the holder is of substantially cylindrical form or shape, and its inner, threaded end protrudes through the rear end of the bit to receive a fastening nut 12 that is turned tight against the face of the collar 2, and the latter is attached as usual to the tubular drill rod.
- the front end I3 of the tubular holder is tapered, and flares outwardly ahead of the main cutting face of the bit, in order that the nut may draw the holder tightly into the hollow head to insure that the rigidly connected bit and holder may revolve or rotate together.
- the water passes through one or more lateral ports it into an annular space or water chamber I5 of the bit-head, and from thence the water flows to the exterior of the bit through the ports 5.
- the holder is also provided with the central opening 6-! to take care of the core that is formed, or may be formed in the bottom of the drilled-hole, and to supply water to the cutters or diamonds in the face of the recess 8'. Should these cutters wear away more rapidly than the cutters on the convex face of the head of the bit, another holder may readily be substituted.
- a hollow drilling-bit having a front opening.
- a tubular cutter-holder having a front opening and means for securing said holder in the bit, said cutter-holder having a concave cutting face surrounding its front opening, a convex cutting face on the bit surrounding the holder, cutters set in said faces, and means for attachment to a tubular drill rod.
- a hollow drilling bit having a front opening, a convex cutting face surrounding said opening, and cutters in said face, a removable, tubular cutter-holder having a threaded end and located in the bit and a securing nut on said threaded end, another end of said holder having an outwardly flaring head of greater diameter than the diameter of the hollow drilling bit, said flaring head having a concave cutting face surrounding a central front opening of the flaring head and cutters in said face, and means for attachment to a tubular drill rod.
- a hollow drilling bit having a central opening terminating in a reduced orifice, a concave cutting face surrounding the outer end of the orifice, a convex cutting face surrounding said concave cutting face and outlet ports from the interior of the bit to said convex face, cutters set in said faces, and means for attaching the drilling bit to a tubular drill rod.
- a hollow drilling bit a tubular cutter-holder having an exterior head portion, and means for securing said holder in the bit, the interior of said tubular holder terminating in an orifice in its head-portion, a concave cutting face in said head portion surrounding the orifice, a convex cutting face on the bit surrounding the head- 'portion, cutters set in said faces, and means for attaching the bit to a tubular drill rod.
Description
I I ROTARY DRILLING BIT Filed May 29, 1934 Willin limii h tll Patented Sept. 8, 1936 PATENT OFFICE ROTARY DRILLING BIT William J. Mitchell, San Francisco, Calif., as-
signor to Chicago Pneumatic Tool Company, New York, N. Y., a corporation of New Jersey Application May 29, 1934, Serial No. 728,114
4 Claims. (Cl. 25561) My present invention relates to an improved rotary drilling bit of the core type, which bit while adapted for use in various ways, is especially designed for drilling blasting-holes employed in different forms of excavation work. The primary object of the invention is the provision of a highspeed rotary drill bit on which the diamond-cutters or stones are arranged in such manner as to insure maximum durability for the cutters with which the face of the bit is studded, and also to assure maximum efliciency for the bit in the performance of its functions of earth drilling or boring. 1
The invention consists essentially in certain novel combinations andarrangements involving a bit having a threaded collar for attachment to the tubular drill-rod of a drilling machine, and in the hollow bit-head with its cutting-face and cutters located thereon, as will hereinafter be more fully set forth and claimed. In the accompanying drawing I have illustrated several forms of the invention, in which the bit is adapted for work in both hard and soft earth where excavations are to be made, but it will be understood that changes and alterations may be made in these exemplifying structures, within the scope of my claims without departing from the principles of my invention.
Figure 1 is a side view of a bit embodying my invention, with the cutting stones or diamonds omitted for convenience of illustration; and Figure 2 is an enlarged detail sectional view of the bit.
Figure 3 is a sectional view of a high speed bit adapted specially for use in comparatively soft earth, and involving my invention; and Figure 4 is a face of the bit of Figure 3.
Figure 5 is a side view of another form of bit involving my invention, with the diamonds omitted; and Figure 6 is an enlarged detail sectional view of the bit of Figure 5 showing the replaceable orinterchangeable cutter-holder at the center of the bit.
In the form of the invention shown in Figures 1 and 2 the bit is adapted for boring or drilling in hard stone, granite and other hard materials; in Figures 3 and 4 the bit is especially adapted for boring or drilling in limestone, sandstone, and other soft stones, as well as in soft-earth; and in the bit of Figures 5 and 6 I illustrate particularly a removable and replaceable cutter holder by means of which the durability and usefulness of the bit is prolonged.
In all forms of the bit illustrated I employ a substantially rounded or convex head I having an integral, exterlorly threaded collar 2 by means of which the bit is threaded on the end of the usual tubular drill rod of a drilling machine. The front face 3 of the head is rounded or convexed, but not pointed, and the central portion of the face of the head is flattened or truncated. The head is hollow and is provided with an interior, comparatively large water chamber 4, which receives water under pressure from the tubular drill rod, and by means of the distributing ports 5 that open to the cutting face of the bit, water is fed in front of the rotating bit, for the purpose of carrying off the cuttings or dbris. These cuttings are subsequently disposed of and conveyed to the surface of the ground by the water flowing back through the drilled-hole around the outside of the tubular drill rod.
The central cylindrical water chamber 4 is also open to the cutting face of the bit through a central port 6, which is countersunk or enlarged at l where it opens into the water chamber 4. During the cutting operations an uncut core is fashioned at the center of the bottom of the drilled-hole. This core, if fashioned from soft earth or other soft material, is quickly broken into small particles which are scattered by the passage of the water under pressure to the face of the bit; if the bit is working in hard material, as granite, the uncut core may enter the central port 6 of the bit before being disintegrated, but
the core is eventually crushed or broken into small bits which may be conveyed by the water under pressure through the several outlet ports for water, through and from the interior of the hollow bit.
In the bit illustrated in Figures 1 and 2, which is especially adapted for drilling in hard rock, the flattened convex face of the head is provided with an inverted, cone-shaped recess 8, the annular wall of which flares outwardly from the central port 6 of the bit, and the wall of the recess merges with the face of the bit to form an annular shoulder between the convex portion and the concave portion of the face, as best seen in or revolves.
I have found by actual practice that if cutters are located at the apex or central part of the convex face of the bit, these cutters bear the brunt of pressure applied to the bit, and, although these cutters turn at a slower surface speed than the cutters located at a distance from the center of the bit, the central cutters wear away more rapidly than the cutters having the greater surface speed. Therefore, by dispensing with the use of cutters at the center 'of the bit, the remaining cutters or diamonds, having a more uniformly faster surface speed, bear the brunt of the pressure, and the pressure is thus more evenly distributed for more nearly uniform wear on the cutters.
The presence of the depressed recess or concave face in the convex bit-face, also-serves, with the convex face, to maintain the true course of the advancing bit as it is fed to its work.
In Figures 3 and 4 where the illustrated bit is designed to penetrate comparatively soft material, the high speed of the rotary bit and rapid cutting of the soft material, require a larger clearance space to accommodate the rapidly formed cuttings, and these cutting are disposed of through the series of radial grooves I which extend from a point adjacent the central port 6 to the outer edge of the bit.
In Figures 5 and 6 I illustrate the use of a removable cutter-holder or tubular insert I I having the water chamber 4, the central port 6 and countersunk hole I, and a recess 8' similar to the recess of Figure 2. This tubular cutter-holder may readily be fitted into the hollow bit, or removed therefrom when the cutters 9 on the face 8' become worn, and fresh cutters may be substituted for the worn cutters, or another holder with fresh cutters may be substituted for the used holder. The holder is of substantially cylindrical form or shape, and its inner, threaded end protrudes through the rear end of the bit to receive a fastening nut 12 that is turned tight against the face of the collar 2, and the latter is attached as usual to the tubular drill rod.
The front end I3 of the tubular holder is tapered, and flares outwardly ahead of the main cutting face of the bit, in order that the nut may draw the holder tightly into the hollow head to insure that the rigidly connected bit and holder may revolve or rotate together.
From the water chamber 4 of the holder, the water passes through one or more lateral ports it into an annular space or water chamber I5 of the bit-head, and from thence the water flows to the exterior of the bit through the ports 5. The holder is also provided with the central opening 6-! to take care of the core that is formed, or may be formed in the bottom of the drilled-hole, and to supply water to the cutters or diamonds in the face of the recess 8'. Should these cutters wear away more rapidly than the cutters on the convex face of the head of the bit, another holder may readily be substituted.
Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:
l. A hollow drilling-bit having a front opening. a tubular cutter-holder having a front opening and means for securing said holder in the bit, said cutter-holder having a concave cutting face surrounding its front opening, a convex cutting face on the bit surrounding the holder, cutters set in said faces, and means for attachment to a tubular drill rod.
2. A hollow drilling bit having a front opening, a convex cutting face surrounding said opening, and cutters in said face, a removable, tubular cutter-holder having a threaded end and located in the bit and a securing nut on said threaded end, another end of said holder having an outwardly flaring head of greater diameter than the diameter of the hollow drilling bit, said flaring head having a concave cutting face surrounding a central front opening of the flaring head and cutters in said face, and means for attachment to a tubular drill rod.
3. A hollow drilling bit having a central opening terminating in a reduced orifice, a concave cutting face surrounding the outer end of the orifice, a convex cutting face surrounding said concave cutting face and outlet ports from the interior of the bit to said convex face, cutters set in said faces, and means for attaching the drilling bit to a tubular drill rod.
4. A hollow drilling bit, a tubular cutter-holder having an exterior head portion, and means for securing said holder in the bit, the interior of said tubular holder terminating in an orifice in its head-portion, a concave cutting face in said head portion surrounding the orifice, a convex cutting face on the bit surrounding the head- 'portion, cutters set in said faces, and means for attaching the bit to a tubular drill rod.
WILLIAM J. MITCHELL.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US728114A US2053801A (en) | 1934-05-29 | 1934-05-29 | Rotary drilling bit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US728114A US2053801A (en) | 1934-05-29 | 1934-05-29 | Rotary drilling bit |
Publications (1)
Publication Number | Publication Date |
---|---|
US2053801A true US2053801A (en) | 1936-09-08 |
Family
ID=24925474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US728114A Expired - Lifetime US2053801A (en) | 1934-05-29 | 1934-05-29 | Rotary drilling bit |
Country Status (1)
Country | Link |
---|---|
US (1) | US2053801A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2543861A (en) * | 1948-02-12 | 1951-03-06 | Harry J Mader | Plug insert bit for core drills |
US2545195A (en) * | 1946-08-24 | 1951-03-13 | Shell Dev | Diamond bit |
US2557302A (en) * | 1947-12-12 | 1951-06-19 | Aubrey F Maydew | Combination drag and rotary drilling bit |
US3035647A (en) * | 1959-02-27 | 1962-05-22 | Wheel Trueing Tool Co | Rotary drill bit |
US3322218A (en) * | 1965-05-04 | 1967-05-30 | Exxon Production Research Co | Multi-port diamond bit |
US3367430A (en) * | 1966-08-24 | 1968-02-06 | Christensen Diamond Prod Co | Combination drill and reamer bit |
US4303136A (en) * | 1979-05-04 | 1981-12-01 | Smith International, Inc. | Fluid passage formed by diamond insert studs for drag bits |
US4321974A (en) * | 1978-12-16 | 1982-03-30 | Hydroc Gesteinsbohrtechnik Gmbh | Annular drilling hammer |
US4574895A (en) * | 1982-02-22 | 1986-03-11 | Hughes Tool Company - Usa | Solid head bit with tungsten carbide central core |
US20070227777A1 (en) * | 2006-03-30 | 2007-10-04 | Sandvik Intellectual Property Ab | Down-the-hole hammer with pilot and method of enlarging a hole |
-
1934
- 1934-05-29 US US728114A patent/US2053801A/en not_active Expired - Lifetime
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2545195A (en) * | 1946-08-24 | 1951-03-13 | Shell Dev | Diamond bit |
US2557302A (en) * | 1947-12-12 | 1951-06-19 | Aubrey F Maydew | Combination drag and rotary drilling bit |
US2543861A (en) * | 1948-02-12 | 1951-03-06 | Harry J Mader | Plug insert bit for core drills |
US3035647A (en) * | 1959-02-27 | 1962-05-22 | Wheel Trueing Tool Co | Rotary drill bit |
US3322218A (en) * | 1965-05-04 | 1967-05-30 | Exxon Production Research Co | Multi-port diamond bit |
US3367430A (en) * | 1966-08-24 | 1968-02-06 | Christensen Diamond Prod Co | Combination drill and reamer bit |
US4321974A (en) * | 1978-12-16 | 1982-03-30 | Hydroc Gesteinsbohrtechnik Gmbh | Annular drilling hammer |
US4303136A (en) * | 1979-05-04 | 1981-12-01 | Smith International, Inc. | Fluid passage formed by diamond insert studs for drag bits |
US4574895A (en) * | 1982-02-22 | 1986-03-11 | Hughes Tool Company - Usa | Solid head bit with tungsten carbide central core |
US20070227777A1 (en) * | 2006-03-30 | 2007-10-04 | Sandvik Intellectual Property Ab | Down-the-hole hammer with pilot and method of enlarging a hole |
US7673706B2 (en) | 2006-03-30 | 2010-03-09 | Sandvik Intellectual Property Ab | Down-the-hole hammer with pilot and method of enlarging a hole |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5176212A (en) | Combination drill bit | |
US3388756A (en) | Percussion bit | |
US2815932A (en) | Retractable rock drill bit apparatus | |
US2578593A (en) | Auger-type drill bit | |
US3433331A (en) | Diamond drill bit | |
US2188631A (en) | Trepanning drill | |
US2719026A (en) | Earth boring drill | |
US2233260A (en) | Means and method of drilling wells | |
US2053801A (en) | Rotary drilling bit | |
US1790613A (en) | A corpo | |
US2264617A (en) | Diamond drill bit | |
US2496421A (en) | Drill bit | |
US2667334A (en) | Full hole diamond bit | |
US2519861A (en) | Double-acting drill bit | |
US2009742A (en) | Face bit | |
US2532783A (en) | Self-piloted rotary drill bit | |
US1703390A (en) | Drill | |
US1907154A (en) | Core drill | |
US4069880A (en) | Excavation tool | |
US2927777A (en) | Roller cutter with gauge cutting reamer | |
US2507221A (en) | Single edge percussion bit | |
US2731236A (en) | Diamond drill bit | |
US2179689A (en) | Drill bit | |
US1899771A (en) | Blade type bit | |
US2587429A (en) | Drag bit |