US3750767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolling cutter mounting in big hole reaming bit
Assignee: Baker Hughes Holdings LLC
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Filing: 1971-05-24
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Granted: 1973-08-07
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Expires: 1991-05-24
Abstract
Abstract A reaming type rock boring drill having an innermost cutter, rotatably supported as a beam. A sleeve or other support member disposed close to, but spaced apart from, the drill stem that forms a portion of the bit body serves as a trunnion or journal for the inner end of the load pin of the cutter bearing assembly. Drilling with such an assembly results in an uncontacted kerf of rock contiguous with the pilot hole. This kerf is disintegrated by mounting the innermost cutter so that the forces applied to the borehole bottom by this cutter act along a line directed into the formation and inwardly toward the pilot hole. As a result, a much higher cutting efficiency is achieved, when contrasted with earlier dispositions in which the innermost cutter acted directly on the bottom of the bore hole immediately adjacent the pilot hole.
Inventors
- 👤 R Pessier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:57
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/28; E21B10/00; E21B10/26; E21B10/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
In a big hole reaming rock bit utilizing at least one rolling cutter supported on a bit body attached to a drill stem to cut that portion of a borehole bottom adjacent a pilot hole, the improvement comprising a sleeve secured to the bit body to surround with a circumferential radial gap the drill stem, which is rigidly secured to the bit body, and an innermost cutter assembly also secured to the bit body and supporting the outer end of a load pin about which said cutters rotate, said load pin also extending radially inwardly and being received and supported in an opening in said sleeve.
Claim 2
Dependent Claim
106 words
In a big hole reaming rock bit utilizing at least one rolling cutter supported on a bit body attached to a drill stem to cut that portion of a borehole bottom adjacent a pilot hole, the improvement comprising a sleeve secured to the bit body to surround with a circumferential radial gap the drill stem, which is rigidly secured to the bit body, and an innermost cutter assembly also secured to the bit body and supporting the outer end of a load pin about which said cutters rotate, said load pin also extending radially inwardly and being received and supported in an opening in said sleeve.
Claim 3
Dependent Claim
110 words
Support structure for an innermost rolling cutter of a big hole reaming rock bit having a base and a drill stem rigidly secured to the base and projecting upwardly therefrom, said structure comprising a pair of upwardly extending support members secured to said base and supporting opposed ends of said cutter, the supporting end region of one of said support members being adjacent, but spaced apart from said drill stem in the region that supports the inner end of the cutter to permit lateral movements independent of the drill stem, the other of said support members being radially spaced from the first to support the outer end of the cutter.
Claim 4
Dependent Claim
110 words
Support structure for an innermost rolling cutter of a big hole reaming rock bit having a base and a drill stem rigidly secured to the base and projecting upwardly therefrom, said structure comprising a pair of upwardly extending support members secured to said base and supporting opposed ends of said cutter, the supporting end region of one of said support members being adjacent, but spaced apart from said drill stem in the region that supports the inner end of the cutter to permit lateral movements independent of the drill stem, the other of said support members being radially spaced from the first to support the outer end of the cutter.
Claim 5
Dependent Claim
109 words
An improved inner mount for a saddle mounted rolling cutter load pin of a reaming big hole rock bit comprising a bit body, a rigid drill stem secured to and projecting from said body, a sleeve flexibly secured to said bit body for independent lateral movement and closely adjacent its drill stem, said sleeve having an opening therein to receive and support the inner end of said rolling cutter load pin, and a saddle mounted to said bit body to support the outer end of said rolling cutter load pin, and a saddle mounted to said bit body to support the outer end of said rolling cutter load pin.
Claim 6
Dependent Claim
109 words
An improved inner mount for a saddle mounted rolling cutter load pin of a reaming big hole rock bit comprising a bit body, a rigid drill stem secured to and projecting from said body, a sleeve flexibly secured to said bit body for independent lateral movement and closely adjacent its drill stem, said sleeve having an opening therein to receive and support the inner end of said rolling cutter load pin, and a saddle mounted to said bit body to support the outer end of said rolling cutter load pin, and a saddle mounted to said bit body to support the outer end of said rolling cutter load pin.
Claim 7
Dependent Claim
118 words
An improvement in bits used for reaming pilot holes, said bit comprising a rigid drill stem section, plate means extending transversely from said drill stem section, rolling cutter assemblies including inner and outer cutter assemblies secured to the plate means, an inner cutter assembly support means including an circumferentially extending innermost upwardly extending portion secured to said plate means in radially spaced relationship with said drill stem section, a load pin to support the roller cutter of said inner cutter assembly and having an inner end extending into the innermost upwardly extending portion of the inner cutter assembly support means and an outer end extending into an outermost upwardly extending portion of the inner cutter assembly support means.
Claim 8
Dependent Claim
118 words
An improvement in bits used for reaming pilot holes, said bit comprising a rigid drill stem section, plate means extending transversely from said drill stem section, rolling cutter assemblies including inner and outer cutter assemblies secured to the plate means, an inner cutter assembly support means including an circumferentially extending innermost upwardly extending portion secured to said plate means in radially spaced relationship with said drill stem section, a load pin to support the roller cutter of said inner cutter assembly and having an inner end extending into the innermost upwardly extending portion of the inner cutter assembly support means and an outer end extending into an outermost upwardly extending portion of the inner cutter assembly support means.
Claim 9
Dependent Claim
96 words
An improvement in bits used for reaming pilot holes, said bit comprising a rigid drill stem section, plate means extending transversely from said drill stem section, rolling cutter assemblies including an inner cutter assembly secured to the plate means, a sleeve secured to the plate means and having a portion defining a circumferential radial gap with the drill stem section, a load pin to support the rolling cutter of said inner cutter assembly, with an inner end extending into engagement with said sleeve for support and an outer end being supported by the inner cutter assembly.
Claim 10
Dependent Claim
96 words
An improvement in bits used for reaming pilot holes, said bit comprising a rigid drill stem section, plate means extending transversely from said drill stem section, rolling cutter assemblies including an inner cutter assembly secured to the plate means, a sleeve secured to the plate means and having a portion defining a circumferential radial gap with the drill stem section, a load pin to support the rolling cutter of said inner cutter assembly, with an inner end extending into engagement with said sleeve for support and an outer end being supported by the inner cutter assembly.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |