US3847236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: Individual
•
Filing: 1973-06-28
•
Granted: 1974-11-12
•
Expires: 1993-06-28
Abstract
Abstract A double ended drill bit having two sets of cones mounted back to back in a cone holder with means for rotating the cone holder about a horizontal axis to expose the second bit for drilling after the teeth on the cones on the first have become worn. Such apparatus includes means for moving the drill bit assembly out of a housing and rotating the drill bit assemblies so as to expose the unworn bit for use in drilling the well.
Inventors
- 👤 J Coalson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:12
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
A drill bit comprising: a housing adapted to be connected to a drill string, a bit carriage mounted in said housing and having conical drill bits mounted on opposite sides thereof, means for moving said carriage out of said housing, and means for rotating said carriage relative to said housing whereby the conical drill bits on either side of said carriage may be exposed for drilling.
Claim 2
Dependent Claim
66 words
A drill bit comprising: a housing adapted to be connected to a drill string, a bit carriage mounted in said housing and having conical drill bits mounted on opposite sides thereof, means for moving said carriage out of said housing, and means for rotating said carriage relative to said housing whereby the conical drill bits on either side of said carriage may be exposed for drilling.
Claim 3
Dependent Claim
18 words
The invention of claim 1, including: bias means for urging said bit carriage inwardly relative to said housing.
Claim 4
Dependent Claim
23 words
The invention of claim 1, including: means in said housing for limiting axial movement of said bit carriage means relative to said housing.
Claim 5
Dependent Claim
36 words
The invention of claim 1 wherein: said means for moving said drill bit carriage comprise yoke means movable axially relative to said housing and wherein said drill bit carriage is rotatably mounted in said yoke means.
Claim 6
Dependent Claim
38 words
The invention of claim 4, wherein: said housing comprises a hollow member having a longitudinally extending shoulder for engaging said yoke means to rotate said yoke with said housing to drive said drill bit mounted in said yoke.
Claim 7
Dependent Claim
16 words
The invention of claim 1, wherein: said means for rotating said bit carriage includes spring means.
Claim 8
Dependent Claim
20 words
The invention of claim 6, wherein: said spring means comprise coil spring mOtor means connecting said yoke and bit carriage.
References Cited (Backward Citations)
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Cited
US1029491A
Cited
US1716741A
Cited
US2133564A
Cited
US2590053A
Cited
US3066749A
Cited
US3369618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |