US3640356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond bit
Assignee: Shell USA Inc
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Filing: 1969-12-12
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Granted: 1972-02-08
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Expires: 1989-12-12
Abstract
Abstract A diamond bit, the diamonds in the sidewall thereof being set in a blunt position in a direction radial to the central axis of the bit as well as in a cutting position in a direction tangential to a helical line passing through the cutting tip of the diamond and having a central axis coinciding with the central axis of the bit.
Inventors
- 👤 Robijn Feenstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:52
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
161 words
A diamond bit for drilling a hole in a subsurface formation, said diamond bit having a central axis and comprising: a bit body; means carried by the bit body for connecting the bit body to a tubular drill string; diamonds set in the bottom part of the bit body to cut the bottom of the hole when used therein; sidewall diamonds set in the sidewall of the bit body to cut the sidewall of the hole, each of said sidewall diamonds being positioned at a cutting diameter on the bit body and being set in a blunt position in a direction radial to the central axis of the diamond bit as well as in a cutting position in a direction tangential to a helical line passing through the cutting tip of that sidewall diamond and having a central axis coinciding with the central axis of the diamond bit, this tangential direction being taken at the cutting tip of the sidewall diamond.
Claim 2
Dependent Claim
161 words
A diamond bit for drilling a hole in a subsurface formation, said diamond bit having a central axis and comprising: a bit body; means carried by the bit body for connecting the bit body to a tubular drill string; diamonds set in the bottom part of the bit body to cut the bottom of the hole when used therein; sidewall diamonds set in the sidewall of the bit body to cut the sidewall of the hole, each of said sidewall diamonds being positioned at a cutting diameter on the bit body and being set in a blunt position in a direction radial to the central axis of the diamond bit as well as in a cutting position in a direction tangential to a helical line passing through the cutting tip of that sidewall diamond and having a central axis coinciding with the central axis of the diamond bit, this tangential direction being taken at the cutting tip of the sidewall diamond.
Claim 3
Dependent Claim
98 words
The diamond bit of claim 1 wherein the diamond bit comprises additional diamonds set in the upper part of the sidewall of the bit body which additional diamonds touch a conical plane having a central axis coinciding with the central axis of the diamond bit, this conical plane being arranged with the apex thereof in a direction opposite to the direction in which the bit is axially loaded during operation, said additional diamonds being positioned at cutting diameters no greater than the largest cutting diameter of said first-mentioned sidewall diamonds set in the sidewall of the bit body.
Claim 4
Dependent Claim
61 words
The diamond bit of claim 1, wherein at least some of the sidewall diamonds set in the sidewall of the bit body touch a conical plane having the central axis thereof coinciding with the central axis of the diamond bit, this conical plane being arranged with the apex thereof in the direction in which the bit is axially loaded during operation.
Claim 5
Dependent Claim
20 words
The diamond bit of claim 3, wherein the apex angle of the conical plane is between 0* 10'' and 20*.
Claim 6
Dependent Claim
96 words
The diamond bit of claim 1, wherein at least some of the sidewall diamonds set in the sidewall of the bit body touch a rotational symmetrical plane which is concave with respect to the central axis of the diamond bit, which has a central axis coinciding with the central axis of the diamond bit, and which can be arranged tangentially to a group of conical surfaces having the central axis thereof coinciding with the central axis of the diamond bit and the apices thereof in the direction in which the bit is axially loaded during operation.
Claim 7
Dependent Claim
34 words
The diamond bit of claim 5, wherein the group of conical surfaces to which the rotatIonal symmetrical plane can be tangentially arranged consists of cones which have apex angles between 0* 10'' and 20*.
Claim 8
Dependent Claim
69 words
The diamond bit of claim 3 wherein at least some additional sidewall diamonds set in the sidewall of the bit body touch a cylindrical plane intersecting the conical plane and having a central axis coinciding with the central axis of the diamond bit, said additional diamonds being positioned at cutting diameters equal to the largest cutting diameter of all other diamonds arranged in the sidewall of the bit body.
Claim 9
Dependent Claim
70 words
The diamond bit of claim 5 wherein at least some additional sidewall diamonds arranged in the sidewall of the bit body touch a cylindrical plane intersecting the rotational symmetrical plane and having a central axis coinciding with the central axis of the diamond bit, said additional diamonds being positioned at cutting diameters equal to the largest cutting diameter of all other diamonds arranged in the sidewall of the bit body.
Claim 10
Dependent Claim
64 words
The diamond bit of claim 1 wherein said sidewall diamonds set in a blunt position in a direction radial to the central axis of the diamond bit have at least one substantially flat plane and wherein said sidewall diamonds are set in said bit body with a substantially flat plane of the sidewall diamond in the plane of the sidewall of the bit body.
Claim 11
Dependent Claim
107 words
The diamond bit of claim 1 wherein said sidewall diamonds set in a blunt position in a direction radial to the central axis of the diamond bit have at least one substantially flat plane and wherein said sidewall diamonds are set such that there is a line of contact between the sidewall diamond and the plane of the sidewall at the trailing part of a flat plane of the sidewall diamond with respect to the direction of motion of the sidewall diamond in operation of the diamond bit and such that the leading part of said flat plane of the sidewall diamond is within the bit body.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |