US3921735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary rock bit with cone mouth air screen
Assignee: Dresser Industries Inc
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Filing: 1975-02-27
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Granted: 1975-11-25
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Expires: 1995-02-27
Abstract
Abstract Drill cuttings in the borehole are prevented from entering the area between the bearing pin and the cone cutter of a rotary rock bit by a cone mouth air screen. The cone cutter includes an internal cavity and a cone mouth positioned over the bearing pin. Bearings are located within the internal cavity between the bearing pin and the cone cutter. A passage extends through the bit body and the bearing pin for conducting a gaseous drilling fluid to the internal cavity for cooling the bearings. A screen means is positioned in the cone mouth between the cone cutter and the bearing pin for preventing solids in the borehole from entering the internal cavity and for allowing the circulating gaseous drilling fluid to pass from the internal cavity into the borehole.
Inventors
- 👤 Theodore Rivers Dysart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:00
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/25; F; F16; F16C; F16C33/00; F16C33/72; F16C33/76; F16C33/78; F16J; F16J15/00; F16J15/16; F16J15/40; F16C2352/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
103 words
A drill bit for connection with a drill string that includes a drilling fluid passage, comprising: a body; a bearing shaft supported from said body; a roller cutter adapted to be rotatably mounted on said bearing shaft; bearing means supporting said cutter on said bearing shaft; a passage within said body adapted to be in communication with the drilling fluid passage in said drill string when said drill bit is connected to the drill string; a passage in said bearing shaft communicating between said passage within said body and said bearing means; and screen means between said bearing shaft and said roller cutter.
Claim 2
Dependent Claim
103 words
A drill bit for connection with a drill string that includes a drilling fluid passage, comprising: a body; a bearing shaft supported from said body; a roller cutter adapted to be rotatably mounted on said bearing shaft; bearing means supporting said cutter on said bearing shaft; a passage within said body adapted to be in communication with the drilling fluid passage in said drill string when said drill bit is connected to the drill string; a passage in said bearing shaft communicating between said passage within said body and said bearing means; and screen means between said bearing shaft and said roller cutter.
Claim 3
Dependent Claim
185 words
A drill bit for use with a circulating fluid, comprising: a head defining an internal chamber; a leg depending from said head; said leg terminating in a bearing shaft; a roller cutter adapted to be mounted on said bearing shaft; bearing means supporting said roller cutter for rotation about said bearing shaft; a first passage through said leg and said bearing shaft, communicating from said internal chamber to a position between said shaft and said cutter; a second passage extending through said bit communicating from said internal chamber to the exterior of said bit, whereby a first portion of the fluid being circulated through said internal chamber is circulated through said first passage, between said shaft and said cutter to cool said bearing means and a second portion of the fluid being circulated through said internal chamber is circulated through said second passage proximate said roller cutter; and screen means positioned between said cutter and said shaft for preventing entry of solids to said bearing means and allowing said first portion of the fluid being circulated through said internal chamber to exit from said bit.
Claim 4
Dependent Claim
185 words
A drill bit for use with a circulating fluid, comprising: a head defining an internal chamber; a leg depending from said head; said leg terminating in a bearing shaft; a roller cutter adapted to be mounted on said bearing shaft; bearing means supporting said roller cutter for rotation about said bearing shaft; a first passage through said leg and said bearing shaft, communicating from said internal chamber to a position between said shaft and said cutter; a second passage extending through said bit communicating from said internal chamber to the exterior of said bit, whereby a first portion of the fluid being circulated through said internal chamber is circulated through said first passage, between said shaft and said cutter to cool said bearing means and a second portion of the fluid being circulated through said internal chamber is circulated through said second passage proximate said roller cutter; and screen means positioned between said cutter and said shaft for preventing entry of solids to said bearing means and allowing said first portion of the fluid being circulated through said internal chamber to exit from said bit.
Claim 5
Dependent Claim
131 words
A rolling cutter rock bit for use with a drilling system that utilizes a gaseous flusHing media for removing materials from the borehole, comprising: a body; a bearing shaft supported by said body; a rolling cutter adapted to be rotatably mounted on said bearing shaft; bearing means supporting said cutter on said bearing shaft; a chamber within said body and adapted to be in communication with said gaseous flushing media; a passage in said bearing shaft communicating between said chamber and said bearing means to divert said gaseous flushing media to said bearing means; and screen means between said bearing shaft and said rolling cutter for preventing materials from the borehole from contacting said bearing means and allowing said gaseous flushing media to pass from said bearing means into the borehole.
Claim 6
Dependent Claim
131 words
A rolling cutter rock bit for use with a drilling system that utilizes a gaseous flusHing media for removing materials from the borehole, comprising: a body; a bearing shaft supported by said body; a rolling cutter adapted to be rotatably mounted on said bearing shaft; bearing means supporting said cutter on said bearing shaft; a chamber within said body and adapted to be in communication with said gaseous flushing media; a passage in said bearing shaft communicating between said chamber and said bearing means to divert said gaseous flushing media to said bearing means; and screen means between said bearing shaft and said rolling cutter for preventing materials from the borehole from contacting said bearing means and allowing said gaseous flushing media to pass from said bearing means into the borehole.
Claim 7
Dependent Claim
204 words
A rotary rock bit suitable for use with a gaseous drilling fluid, comprising: a head defining an internal chamber; a bearing pin depending from said head; a cone cutter adapted to be mounted on said bearing pin, said cone cutter having a concave cavity projecting from a cone mouth, said cavity and cone mouth positioned over said bearing pin; bearing means located in said cavity supporting said cone cutter for rotation about said bearing pin; a first passage through said head and said bearing pin communicating from said internal chamber to said cavity; a second passage extending through said head communicating from said internal chamber to the exterior of said bit, whereby a first portion of the fluid being circulated through said internal chamber is circulated through said first passage to said cavity to cool said bearing means and a second portion of the fluid being circulated through said internal chamber is circulated through said second passage proximate said cone cutter; and screen means positioned in said cone mouth between said cone cutter and said bearing pin for preventing entry of solids into said cavity and allowing said first portion of the fluid being circulated through said internal chamber to exit from said cavity.
Claim 8
Dependent Claim
204 words
A rotary rock bit suitable for use with a gaseous drilling fluid, comprising: a head defining an internal chamber; a bearing pin depending from said head; a cone cutter adapted to be mounted on said bearing pin, said cone cutter having a concave cavity projecting from a cone mouth, said cavity and cone mouth positioned over said bearing pin; bearing means located in said cavity supporting said cone cutter for rotation about said bearing pin; a first passage through said head and said bearing pin communicating from said internal chamber to said cavity; a second passage extending through said head communicating from said internal chamber to the exterior of said bit, whereby a first portion of the fluid being circulated through said internal chamber is circulated through said first passage to said cavity to cool said bearing means and a second portion of the fluid being circulated through said internal chamber is circulated through said second passage proximate said cone cutter; and screen means positioned in said cone mouth between said cone cutter and said bearing pin for preventing entry of solids into said cavity and allowing said first portion of the fluid being circulated through said internal chamber to exit from said cavity.
Claim 9
Dependent Claim
147 words
A rolling cutter rock bit for use with a drilling system that utilizes a gaseous flushing media for removing materials from the borehole, comprising: a body; a bearing shaft supported by said body; a rolling cutter adapted to be rotatably mounted on said bearing shaft; bearing means supporting said cutter on said bearing shaft; a chamber within said body and adapted to be in communication with said gaseous flushing media; a passage in said bearing shaft communicating between said chamber and said bearing means to divert said gaseous flushing media to said bearing means; screen means between said bearing shaft and said rolling cutter for preventing materials from the borehole from contacting said bearing means and allowing said gaseous flushing media to pass from said bearing means into said borehole; and an elastic means for positioning said screen means between said bearing shaft and said rolling cutter.
Claim 10
Dependent Claim
147 words
A rolling cutter rock bit for use with a drilling system that utilizes a gaseous flushing media for removing materials from the borehole, comprising: a body; a bearing shaft supported by said body; a rolling cutter adapted to be rotatably mounted on said bearing shaft; bearing means supporting said cutter on said bearing shaft; a chamber within said body and adapted to be in communication with said gaseous flushing media; a passage in said bearing shaft communicating between said chamber and said bearing means to divert said gaseous flushing media to said bearing means; screen means between said bearing shaft and said rolling cutter for preventing materials from the borehole from contacting said bearing means and allowing said gaseous flushing media to pass from said bearing means into said borehole; and an elastic means for positioning said screen means between said bearing shaft and said rolling cutter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |