US3705635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large diameter earth boring bit
Assignee: Tamrock Canada Inc
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Filing: 1971-01-13
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Granted: 1972-12-12
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Expires: 1991-01-13
Abstract
Abstract The rolling cutters of a large diameter earth boring bit are locked in place in a saddle mount yet may easily be removed. A vee-shaped, slabbed-off portion of the journal is held in place by a cap bolted to the saddle mount.
Inventors
- 👤 William M Conn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:50
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/28; E21B10/08; E21B10/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
An earth boring bit comprising: a main bit body; at least one pair of support arms extending from said main bit body, at least one of the support arms having a pair of supporting surfaces; a rolling cutter positioned between said pair of support arms, said rolling cutter having a central annulus; a journal positioned in the central annulus of the rolling cutter and extending between said support arms, said journal including a vee-shaped end portion having a pair of journal surfaces that are at an angle to the central axis of said journal with said pair of journal surfaces adapted to engage said supporting surfaces on said at least one of the support arms; and a cap removably connected to said one support arm for securing said journal and rolling cutter in position.
Claim 2
Dependent Claim
134 words
An earth boring bit comprising: a main bit body; at least one pair of support arms extending from said main bit body, at least one of the support arms having a pair of supporting surfaces; a rolling cutter positioned between said pair of support arms, said rolling cutter having a central annulus; a journal positioned in the central annulus of the rolling cutter and extending between said support arms, said journal including a vee-shaped end portion having a pair of journal surfaces that are at an angle to the central axis of said journal with said pair of journal surfaces adapted to engage said supporting surfaces on said at least one of the support arms; and a cap removably connected to said one support arm for securing said journal and rolling cutter in position.
Claim 3
Dependent Claim
18 words
The earth boring bit of claim 1 wherein said cap is pivotally connected to said one support arm.
Claim 4
Independent Claim
131 words
An apparatus for securing rotatable cutters in the support arms of a saddle of an earth boring head, said apparatus adapted to take side loading, torque and thrust, comprising: a pair of adjacent supporting surfaces on one of said support arms; a rolling cutter positioned in said saddle, said rolling cutter having a central annulus; a journal positioned in the central annulus of the rolling cutter and extending between said support arms, said journal including a vee-shaped end portion having a pair of journal surfaces that are at an angle to the central axis of said journal with said pair of journal surfaces adapted to engage said supporting surfaces on said support arm; and a cap removably connected to said support arm for securing said journal and rolling cutter in position.
Claim 5
Independent Claim
131 words
An apparatus for securing rotatable cutters in the support arms of a saddle of an earth boring head, said apparatus adapted to take side loading, torque and thrust, comprising: a pair of adjacent supporting surfaces on one of said support arms; a rolling cutter positioned in said saddle, said rolling cutter having a central annulus; a journal positioned in the central annulus of the rolling cutter and extending between said support arms, said journal including a vee-shaped end portion having a pair of journal surfaces that are at an angle to the central axis of said journal with said pair of journal surfaces adapted to engage said supporting surfaces on said support arm; and a cap removably connected to said support arm for securing said journal and rolling cutter in position.
Claim 6
Dependent Claim
18 words
The earth boring bit of claim 8 wherein said cap is pivotally connected to said one support arm.
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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |