US3727705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit with improved gage compact arrangement
Assignee: Hughes Tool Co
•
Filing: 1972-01-21
•
Granted: 1973-04-17
•
Expires: 1992-01-21
Abstract
Abstract A drill bit is disclosed as having a gage compact arrangement by which the resistance to gage wear is increased, gage wear is balanced and the tendency toward off-center wear decreased. The heel row compacts on each cone generally are equally spaced. However, the spacing between the heel row compacts differs from cone to cone to prevent tracking of the compacts in impressions previously made on the bore hole bottom. The cross-sectional dimension of the gage compacts that project from, and protect, the gage surface of each cone is different from cone to cone. As a consequence, the total exposed area of all the gage compacts of one cone approaches the total exposed area of all the gage compacts of each of the other cones.
Inventors
- 👤 E Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:07
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/46; E21B10/50; E21B10/52
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
A drill bit with improved gage compact arrangement, said bit comprising: a bit body adapted to be connected with a drill string member; at least two cones rotatably supported on said bit body; wear resistant compacts retained by said cones; a group of compacts in each cone defining a row of heel compacts, the spacing of heel row compacts being greater on one cone than the other; a row of gage compacts in a gage surface of each cone, said gage compacts being positioned between the compacts of the associated heel row; the cross-sectional area of gage compacts between the heel row compacts of greater spacing being greater than the crosssectional area of the gage compacts between the heel row compacts of lesser spacing to improve balance of the total exposed area of the gage compacts among the cones.
Claim 2
Dependent Claim
139 words
A drill bit with improved gage compact arrangement, said bit comprising: a bit body adapted to be connected with a drill string member; at least two cones rotatably supported on said bit body; wear resistant compacts retained by said cones; a group of compacts in each cone defining a row of heel compacts, the spacing of heel row compacts being greater on one cone than the other; a row of gage compacts in a gage surface of each cone, said gage compacts being positioned between the compacts of the associated heel row; the cross-sectional area of gage compacts between the heel row compacts of greater spacing being greater than the crosssectional area of the gage compacts between the heel row compacts of lesser spacing to improve balance of the total exposed area of the gage compacts among the cones.
Claim 3
Dependent Claim
30 words
The improved drill bit defined by claim 1 in which the lowermost edge of each gage compact is located at the same elevation from the bottom of the drill bit.
Claim 4
Dependent Claim
100 words
A drill bit with improved gage compact arrangement, said bit comprising: a bit body adapted to be connected with a drill string member; at least two cones rotatably supported on said bit body; wear resistant compacts retained by said cones; a row of gage compacts of selected cross-sectional dimension in a gage surface of the cone having the lesser heel row spacing; and a row of gage compacts of greater cross-sectional dimension in the gage surface of the cone having the greater heel row spacing to improve balance of the total exposed area of the gage compacts among the cones.
Claim 5
Dependent Claim
100 words
A drill bit with improved gage compact arrangement, said bit comprising: a bit body adapted to be connected with a drill string member; at least two cones rotatably supported on said bit body; wear resistant compacts retained by said cones; a row of gage compacts of selected cross-sectional dimension in a gage surface of the cone having the lesser heel row spacing; and a row of gage compacts of greater cross-sectional dimension in the gage surface of the cone having the greater heel row spacing to improve balance of the total exposed area of the gage compacts among the cones.
Claim 6
Dependent Claim
30 words
The improved drill bit defined by claim 3 in which the lowermost edge of each gage compact is located at the same elevation from the bottom of The drill bit.
References Cited (Backward Citations)
US2527838A
Cited
US2533260A
Cited
US2774570A
Cited
US2907551A
Cited
US2887302A
Cited
US2939684A
Cited
US3186500A
Cited
US3389761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |