US3659659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large diameter bit with a replaceable stem
Assignee: Tamrock Canada Inc
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Filing: 1970-02-04
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Granted: 1972-05-02
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Expires: 1990-02-04
Abstract
Abstract A bit for drilling a large diameter hole has a replaceable stem. The body of the bit includes a multiplicity of stages around a central axis. The bit is attached to the drill column by a replaceable stem connected to the main body of the bit and the body of the bit includes a series of plates separated by a series of hollow support elements.
Inventors
- 👤 Carl L Lichte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:09
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/10; E21B10/26; E21B10/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
A bit for enlarging a pilot hole into a large diameter hole by disintegrating the earth formation surrounding the pilot hole comprising: a main bit body including a multiplicity of drilling stages for contacting and disintegrating the earth formation surrounding the pilot hole wherein said multiplicity of drilling stages consist of a multiplicity of plates separated by and attached to a multiplicity of hollow support elements and a multiplicity of saddles with cutters mounted in said saddles, said saddlEs and cutters mounted on said plates; and a stem for extending through said pilot hole that is removably connected to at least two drilling stages of said main bit body.
Claim 2
Dependent Claim
109 words
A bit for enlarging a pilot hole into a large diameter hole by disintegrating the earth formation surrounding the pilot hole comprising: a main bit body including a multiplicity of drilling stages for contacting and disintegrating the earth formation surrounding the pilot hole wherein said multiplicity of drilling stages consist of a multiplicity of plates separated by and attached to a multiplicity of hollow support elements and a multiplicity of saddles with cutters mounted in said saddles, said saddlEs and cutters mounted on said plates; and a stem for extending through said pilot hole that is removably connected to at least two drilling stages of said main bit body.
Claim 3
Dependent Claim
33 words
The bit of claim 1 including first means for removably connecting said stem to one of said multiplicity of plates and second means for removably connecting said stem to another of said plates.
Claim 4
Dependent Claim
21 words
The bit of claim 2 including stabilizer means connected to said stem for contacting said pilot hole and stabilizing said bit.
Claim 5
Dependent Claim
91 words
A bit for enlarging a pilot hole by disintegrating the formations surrounding the pilot hole, said bit to be attached to a rotary drill column, comprising: a main bit body including a first plate, a second plate, a first hollow support element connected to and separating said first and second plates, a multiplicity of cutter means for disintegrating the formations, said multiplicity of cutter means mounted on said first and second plates, and a stem removably connected to both of said plates, for attaching said bit to said rotary drill column.
Claim 6
Dependent Claim
91 words
A bit for enlarging a pilot hole by disintegrating the formations surrounding the pilot hole, said bit to be attached to a rotary drill column, comprising: a main bit body including a first plate, a second plate, a first hollow support element connected to and separating said first and second plates, a multiplicity of cutter means for disintegrating the formations, said multiplicity of cutter means mounted on said first and second plates, and a stem removably connected to both of said plates, for attaching said bit to said rotary drill column.
Claim 7
Dependent Claim
38 words
The bit of claim 4 including: a third plate, a second hollow support element connected to and separating said second and third plates, and a multiplicity of cutter means for disintegrating the formations mounted on said third plate.
Claim 8
Dependent Claim
19 words
The bit of claim 5 including an opening in said third plate to provide access to said second plate.
Claim 9
Dependent Claim
23 words
The bit of claim 5 including: at least one additional plate with cutter means mounted thereon and at least one additional hollow element.
Claim 10
Dependent Claim
16 words
The bit of claim 7 wherein said stem includes a stabilizer section with an enlarged diameter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |