US3866698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Raise drilling bit
Assignee: Camco Drilling Group Ltd
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Filing: 1973-11-16
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Granted: 1975-02-18
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Expires: 1993-11-16
Abstract
Abstract A rotary drill bit for producing a raise bore about a pilot hole including a drill head having an upper surface for mounting cutter assemblies. A lower surface spaced from said upper surface and having a drive stem attached thereto. The drive stem being adapted for limited or floating movement with respect to said upper mounting surface.
Inventors
- 👤 John M Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:49
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/28; E21B10/00; E21B10/08; E21B10/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
A rotary drill bit for producing a raise bore by disintegrating the earth formation surrounding a pilot hole comprising: a drill head having an upper mounting member and an attachment portion, a plurality of cutters secured to said upper mounting member, a drive stem, said drive stem being fastened to said attachment portion and extending through said upper mounting member without force transmitting contact therewith thereby to be floating with respect to said upper mounting member.
Claim 2
Dependent Claim
76 words
A rotary drill bit for producing a raise bore by disintegrating the earth formation surrounding a pilot hole comprising: a drill head having an upper mounting member and an attachment portion, a plurality of cutters secured to said upper mounting member, a drive stem, said drive stem being fastened to said attachment portion and extending through said upper mounting member without force transmitting contact therewith thereby to be floating with respect to said upper mounting member.
Claim 3
Dependent Claim
18 words
A drill bit according to claim 1 wherein the upper mounting member is spaced from said attachment portion.
Claim 4
Dependent Claim
25 words
A drill bit according to claim 1 wherein the cutters are arranged to drill the raise bore in a single stage about the pilot hole.
Claim 5
Dependent Claim
13 words
A drill bit according to claim 1 wherein the cutters include rolling cutters.
Claim 6
Dependent Claim
68 words
In a rotary drill bit for producing raise bores by enlarging a pilot hole, a drill head having an upper portion adapted to have secured thereon a plurality of cutters, and an attachment means, a drive stem, said drive stem being fastened to said attachment portion and extending through said upper mounting member without force transmitting contact therewith, thereby to be floating with respect to said upper portion.
Claim 7
Dependent Claim
68 words
In a rotary drill bit for producing raise bores by enlarging a pilot hole, a drill head having an upper portion adapted to have secured thereon a plurality of cutters, and an attachment means, a drive stem, said drive stem being fastened to said attachment portion and extending through said upper mounting member without force transmitting contact therewith, thereby to be floating with respect to said upper portion.
Claim 8
Dependent Claim
19 words
A drill head according to claim 5 wherein said drive stem attachment means is spaced from said upper portion.
Claim 9
Dependent Claim
13 words
A drill head according to claim 5 wherein the cutters include rolling cutters.
Claim 10
Dependent Claim
18 words
A drill head according to claim 5 wherein the drive stem is removably fastened to said attachment means.
Claim 11
Dependent Claim
73 words
A rotary drill bit for producing a raise bore by disintegrating the earth formation surrounding a pilot hole comprising: a drill head having an upper mounting member and an attachment portion, a plurality of cutters secured to said upper mounting member, a drive stem, said drive stem being fastened to said attachment portion and extending with clearance through said upper mounting member for limited floating movement with respect to said upper mounting member.
Claim 12
Dependent Claim
73 words
A rotary drill bit for producing a raise bore by disintegrating the earth formation surrounding a pilot hole comprising: a drill head having an upper mounting member and an attachment portion, a plurality of cutters secured to said upper mounting member, a drive stem, said drive stem being fastened to said attachment portion and extending with clearance through said upper mounting member for limited floating movement with respect to said upper mounting member.
Claim 13
Dependent Claim
64 words
In a rotary drill bit for producing raise bores by enlarging a pilot hole, a drill head having an upper portion adapted to have secured thereon a plurality of cutters, and an attachment means, a drive stem, said drive stem being fastened to said attachment means and extending with clearance through said upper portion for limited floating movement with respect to said upper portion.
Claim 14
Dependent Claim
64 words
In a rotary drill bit for producing raise bores by enlarging a pilot hole, a drill head having an upper portion adapted to have secured thereon a plurality of cutters, and an attachment means, a drive stem, said drive stem being fastened to said attachment means and extending with clearance through said upper portion for limited floating movement with respect to said upper portion.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |