US3762486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Big hole drilling bit
Assignee: United States Atomic Energy Commission
•
Filing: 1972-03-06
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Granted: 1973-10-02
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Expires: 1992-03-06
Abstract
Abstract A big hole drilling bit of the type utilizing a plurality of roller cutters mounted for cutting in a plane perpendicular to the axis of rotation of the bit. Regrinding of cuttings is reduced by providing baffles in association with individual roller cutters to prevent the normal pumping action of the cutters from depositing their own cuttings in front of them. Baffles may merely disrupt the pumping action of the roller cutters or they may be designed to utilize the pumping action to assist in transporting cuttings toward a pickup opening through which the transport of the cuttings to the earth''s surface is initiated.
Inventors
- 👤 W Grovenburg
- 👤 R Gatliff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:10
CPC Classifications
E; E21; E21B; E21B12/00; E21B12/06; E21B10/00; E21B10/08; E21B10/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A large diameter bit for producing holes in the earth by rotary drilling comprising a cutter support structure, a plurality of roller cutters including gage cutters and a plurality of interior cutters radially inward thereof individually mounted on the bottom of said support in a manner to engage the bottom of a hole upon rotation of said bit therein, means mounted in association with at least one of said roller cutters for preventing cuttings produced thereby from being deposited in front of said cutter by the pumping action thereof, a pickup opening in said support radially inward of said at least one cutter and said means mounted in association therewith and means for directing cuttings produced by said at least one cutter toward said pickup opening.
Claim 2
Dependent Claim
126 words
A large diameter bit for producing holes in the earth by rotary drilling comprising a cutter support structure, a plurality of roller cutters including gage cutters and a plurality of interior cutters radially inward thereof individually mounted on the bottom of said support in a manner to engage the bottom of a hole upon rotation of said bit therein, means mounted in association with at least one of said roller cutters for preventing cuttings produced thereby from being deposited in front of said cutter by the pumping action thereof, a pickup opening in said support radially inward of said at least one cutter and said means mounted in association therewith and means for directing cuttings produced by said at least one cutter toward said pickup opening.
Claim 3
Dependent Claim
26 words
The drill bit of claim 1 wherein said means mounted in association with said at least one roller cutter direct the flow of cuttings radially inwardly.
Claim 4
Dependent Claim
30 words
The drill bit of claim 1 wherein said means mounted in association with said at least one roller cutter block the flow of cuttings over the top of said cutter.
Claim 5
Dependent Claim
32 words
The drill bit of claim 1 wherein said means mounted in association with said at least one roller cutter are baffle arrangements provided in association with a plurality of individual roller cutters.
Claim 6
Dependent Claim
58 words
The drill bit of claim 4 including a series of cutters with each successive cutter being positioned radially inward and circumferentially forward with respect to the direction of rotation of said bit, said associated baffle means of at least one roller of said series discharging cuttings therefrom into the region immediately behind a successive roller of said series.
Claim 7
Dependent Claim
30 words
The drill bit of claim 5 wherein at least one cutter of said series has associated baffle means which block the flow of fluid over the top of said cutter.
Claim 8
Dependent Claim
25 words
The drill bit of claim 6 wherein all of the roller cutters thereof except a center cutter are arranged into a plurality of said series.
Claim 9
Dependent Claim
31 words
The drill bit of claim 5 wherein each preceding roller of said series has associated baffle means which discharges into the region immediately behind its next successive roller of said series.
Claim 10
Dependent Claim
53 words
The drill bit of claim 8 wherein all of the roller cutters thereof except a center cutter are arranged into a plurality of said series and said baffle means of the innermost cutter of each series discharge toward a pickup means adapted for connection to means for transporting cuttings out of the hole.
Claim 11
Dependent Claim
17 words
The drill bit of claim 9 wherein said pickup means is at the center of said bit.
References Cited (Backward Citations)
US1686957A
Cited
US1391626A
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US1657608A
Cited
US2041467A
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US2644671A
Cited
US2654578A
Cited
US3583503A
Cited
US3674314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |