US3595327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drill bit and holder
Assignee: United States Steel Corp
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Filing: 1969-08-11
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Granted: 1971-07-27
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Expires: 1989-08-11
Abstract
Abstract A combination for drilling a hole in a rock strata is disclosed and has a hollow drill bit holder provided with an exhaust port, a shank receiving opening in one end, and a material receiving surface adjacent the one end. A dill bit has a bit body provided with an insert slot extending across the bit body and having a shank in the shank receiving opening so that the drill bit holder and the drill bit rotate as a unit in one direction. A drilling insert is secured in the insert slot and has a peeling cutter for peeling off substantially large peelings of rock strata, and an outer cutter extending from the peeling cutter to the periphery of the drilling insert for grinding off substantially fine dust from the rock strata. The bit body has a troughing surface sloping away from the peeling cutter and the outer cutter to the material receiving surface. The troughing surface is operable to rapidly guide the peelings and the dust from the peeling cutter and the outer cutter to the material receiving surface and across the material receiving surface to the exhaust port to provide rapid and complete removal of the peelings and the dust. Connecting means are provided for connecting the drill bit holder to the shank, and drive means are used for rotating the drill bit holder and the drill bit to cut the hole in the rock strata. This combination, as disclosed, is functional to provide improved penetration rates and extended bit life by providing more rapid and complete removal of the peelings and the dust, a reduction in the amount of thrust on the drill bit holder required to drill the hole in the rock strata, and a reduction in the operating temperature of the drill bit.
Inventors
- 👤 Theodore R Self
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:40
CPC Classifications
E; E21; E21B; E21B10/00; B; B23; B23B; B23B51/00; E21B10/46; E21B10/58; B23B2251/00; B23B2251/02; B23B2251/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
308 words
For drilling a hole in a rock strata the combination of: a. a hollow drill bit holder provided with an exhaust port, a shank receiving opening in one end, and a material receiving surface adjacent said on end, b. a drill bit having: 1. a bit body provided with an insert slot extending across said bit body and having a shank in said shank receiving opening so that said drill bit holder and said drill bit rotate as a unit in one direction, c. a drilling insert secured in said insert slot and having: 1. a peeling cutter for peeling off substantially large peelings of rock strata, 2. an outer cutter extending from one side of said peeling cutter to the periphery of said drilling insert for grinding off substantially fine dust from said rock strata, d. said bit body having a troughing surface sloping away from said peeling cutter and said outer cutter to said material receiving surface, e. connecting means for connecting said drill bit holder to said shank, and f. drive means for rotating said drill bit holder and said drill bit to cut said hole in said rock strata, g. said troughing surface being operable to rapidly guide said peelings and said dust from said peeling cutter and said outer cutter to said material receiving surface and across said material receiving surface to said exhaust port to provide improved bit penetration rates, a reduction in the operating temperature of said drill bit and an extended life of said drill bit, h. said peeling cutter defining with said outer cutter a linear cutting point for rapid low friction removal of peelings, chips and the like and being provided with a material removal cavity communicating with said troughing surface for the rapid spacious removal of said peelings, chips and the like from said linear cutting point.
Claim 2
Dependent Claim
308 words
For drilling a hole in a rock strata the combination of: a. a hollow drill bit holder provided with an exhaust port, a shank receiving opening in one end, and a material receiving surface adjacent said on end, b. a drill bit having: 1. a bit body provided with an insert slot extending across said bit body and having a shank in said shank receiving opening so that said drill bit holder and said drill bit rotate as a unit in one direction, c. a drilling insert secured in said insert slot and having: 1. a peeling cutter for peeling off substantially large peelings of rock strata, 2. an outer cutter extending from one side of said peeling cutter to the periphery of said drilling insert for grinding off substantially fine dust from said rock strata, d. said bit body having a troughing surface sloping away from said peeling cutter and said outer cutter to said material receiving surface, e. connecting means for connecting said drill bit holder to said shank, and f. drive means for rotating said drill bit holder and said drill bit to cut said hole in said rock strata, g. said troughing surface being operable to rapidly guide said peelings and said dust from said peeling cutter and said outer cutter to said material receiving surface and across said material receiving surface to said exhaust port to provide improved bit penetration rates, a reduction in the operating temperature of said drill bit and an extended life of said drill bit, h. said peeling cutter defining with said outer cutter a linear cutting point for rapid low friction removal of peelings, chips and the like and being provided with a material removal cavity communicating with said troughing surface for the rapid spacious removal of said peelings, chips and the like from said linear cutting point.
Claim 3
Dependent Claim
13 words
The combination recited in claim 1 wherein said material removal cavity is arcuate.
Claim 4
Dependent Claim
200 words
an outer cutter extending from one side of said peeling cutter to the periphery of said drilling insert for grinding off substantially fine dust from said rock strata, d. said bit body having a troughing surface sloping away from said peeling cutter and said outer cutter to said material receiving surface, e. connecting means for connecting said drill bit holder to said shank, and f. drive means for rotating said drill bit holder and said drill bit to cut said hole in said rock strata, g. said troughing surface being operable to rapidly guide said peelings and said dust from said peeling cutter and said outer cutter to said material receiving surface and across said material receiving surface to said exhaust port to provide improved bit penetration rates, a reduction in the operating temperature of said drill bit and an extended life of said drill bit, h. said peeling cutter defining with said outer cutter a linear cutting point for rapid low friction removal of peelings, chips and the like and being provided with a material removal cavity communicating with said troughing surface for the rapid spacious removal of said peelings, chips and the like from said linear cutting point.
Claim 5
Dependent Claim
200 words
an outer cutter extending from one side of said peeling cutter to the periphery of said drilling insert for grinding off substantially fine dust from said rock strata, d. said bit body having a troughing surface sloping away from said peeling cutter and said outer cutter to said material receiving surface, e. connecting means for connecting said drill bit holder to said shank, and f. drive means for rotating said drill bit holder and said drill bit to cut said hole in said rock strata, g. said troughing surface being operable to rapidly guide said peelings and said dust from said peeling cutter and said outer cutter to said material receiving surface and across said material receiving surface to said exhaust port to provide improved bit penetration rates, a reduction in the operating temperature of said drill bit and an extended life of said drill bit, h. said peeling cutter defining with said outer cutter a linear cutting point for rapid low friction removal of peelings, chips and the like and being provided with a material removal cavity communicating with said troughing surface for the rapid spacious removal of said peelings, chips and the like from said linear cutting point.
Claim 6
Dependent Claim
212 words
an outer cutter extending from one side of said peeling cutter to the periphery of said drilling insert for grinding substantially fine dust from said rock strata, c. said bit body having a troughing surface sloping away from said peeling cutter and said outer cutter to said material receiving surface, d. said troughing surface being operable to rapidly guide said peelings and said dust from said peeling cutter and said outer cutter to said material receiving surface and across said material receiving surface to said exhaust port to provide rapid and complete removal of said peelings and said dust, to reduce the amount of thrust on said drill bit holder required to drill said hole in said rock strata, and to provide improved bit penetration rates, a reduction in the operating temperature of said drill bit and an extended life of said drill bit, e. said peeling cutter defining with said outer cutter a linear cutting point for rapid low friction removal of peelings, chips and the like and being provided with a material removal cavity communicating with said troughing surface for the rapid spacious removal of said peelings, chips and the like from said linear cutting point. 8 The combination recited in claim 7 wherein said material removal cavity is arcuate.
Claim 7
Dependent Claim
38 words
The combination recited in claim 1 wherein said material removal cavity has a width W and a depth D, the ratio of W to D being g in the range of about 1 1/4 to 1 1/2 .
Claim 8
Dependent Claim
40 words
The combination recited in claim 1 wherein said material removal cavity has a width W and said bit body has an outside diameter of DI, the ratio of W to DI being in the range of about one-third to one-half.
Claim 9
Dependent Claim
40 words
The combination recited in claim 1 wherein said material removal cavity has a depth of D and said bit body has an outside diameter of DI, the ratio of D to DI being in the range of one-fourth to four-elevenths.
Claim 10
Dependent Claim
73 words
The combination recited in claim 1 and wherein said drilling insert has a second outer cutter extending from the other side of said peeling cutter to the periphery of sAid drilling insert for grinding off substantially fine dust from said rock strata and said bit body has a second troughing surface adjacent said second outer cutter sloping away from said peeling cutter and said second outer cutter to a second material receiving surface.
Claim 11
Dependent Claim
41 words
For a hollow drill bit holder provided with an exhaust port, a shank receiving opening in one end, and a material receiving surface adjacent said one end and for drilling a hole in a rock strata: a. a drill bit having:
Claim 12
Dependent Claim
41 words
For a hollow drill bit holder provided with an exhaust port, a shank receiving opening in one end, and a material receiving surface adjacent said one end and for drilling a hole in a rock strata: a. a drill bit having:
Claim 13
Dependent Claim
36 words
The combination recited in claim 7 wherein said material removal cavity has a width W and a depth D, the ratio of W to D being in the range of 1 1/4 to 1 1/2 .
Claim 14
Dependent Claim
40 words
The combination recited in claim 7 wherein said material removal cavity has a width W and said bit body has an outside diameter of DI, the ratio of W to DI being in the range of about one-third to one-half.
Claim 15
Dependent Claim
40 words
The combination recited in claim 7 wherein said material removal cavity has a depth of D and said bit body has an outside diameter of DI, the ratio of D to DI being in the range of one-fourth to four-elevenths.
Claim 16
Dependent Claim
73 words
The combination recited in claim 7 and wherein said drilling insert has a second outer cutter extending from the other side of said peeling cutter to the periphery of said drilling insert for grinding off substantially fine dust from said rock strata and said bit body has a second troughing surface adjacent said second outer cutter sloping away from said peeling cutter and said second outer cutter to a second material receiving surface.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |