Patent US4350060A successfully refreshed from Google Patents.
US4350060A
Expired / Lapsed
US
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Method of making a rotary rock bit
Assignee: Smith International Inc
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Filing: 1980-08-25
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Granted: 1982-09-21
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Expires: 2000-08-25
Abstract
Abstract A method of making a rotary rock bit is described comprising the steps of forming a one piece bit body having at least two legs extending downwardly therefrom, drilling a bore through each leg, providing a cone cutter for each leg, positioning each cone cutter to be aligned with the bore of a respective leg, inserting a separate journal pin through the bore of each leg until a portion extends into the cavity of the registering cone cutter, providing a thrust element into the cavity of each cone cutter and retaining it therein to form subassemblies, and securing each journal pin to the bore of the respective leg.
Inventors
- 👤 Edward Vezirian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:30
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/20; B; B23; B23P; B23P15/00; B23P15/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
244 words
A method of manufacturing a rotary rock bit comprising the steps of: forming a one piece bit body having an external annular gage surface and a central axis, said bit body further having at least two legs extending downwardly from the rest of the bit body substantially parallel to said central axis along the gage surface, said legs forming an open area therebetween, below the rest of the bit body; drilling a bore through each leg; providing a cone type cutter for each leg, each cutter having an interior cavity; positioning each cone cutter within said open area such that the cavity of each cutter is aligned with the bore of a respective leg; inserting a separate journal pin through the bore of each leg from the external side thereof until a portion of each journal pin extends into the cavity of the registering cone cutter; providing at least two thrust elements having central bores, each thrust element cooperating with their respective journal pin to retain the cone cutter on the journal pin; positioning each thrust member into the cavity of each cone cutter and retaining it therein to form subassemblies; forming an annular shoulder on each thrust member, providing an annular member to engage the shoulder of each thrust member after it is positioned within the cavity of each cone cutter, and securing each annular member to the respective cone cutter; and securing each journal pin to the bore of the respective leg.
Claim 2
Independent Claim
244 words
A method of manufacturing a rotary rock bit comprising the steps of: forming a one piece bit body having an external annular gage surface and a central axis, said bit body further having at least two legs extending downwardly from the rest of the bit body substantially parallel to said central axis along the gage surface, said legs forming an open area therebetween, below the rest of the bit body; drilling a bore through each leg; providing a cone type cutter for each leg, each cutter having an interior cavity; positioning each cone cutter within said open area such that the cavity of each cutter is aligned with the bore of a respective leg; inserting a separate journal pin through the bore of each leg from the external side thereof until a portion of each journal pin extends into the cavity of the registering cone cutter; providing at least two thrust elements having central bores, each thrust element cooperating with their respective journal pin to retain the cone cutter on the journal pin; positioning each thrust member into the cavity of each cone cutter and retaining it therein to form subassemblies; forming an annular shoulder on each thrust member, providing an annular member to engage the shoulder of each thrust member after it is positioned within the cavity of each cone cutter, and securing each annular member to the respective cone cutter; and securing each journal pin to the bore of the respective leg.
Claim 3
Dependent Claim
43 words
The method of claim 1 wherein the step of securing each journal pin to a respective leg comprises the step of projecting a high energy beam along the mating surfaces of the leg bore and the journal pin to fuse the surfaces together.
Claim 4
Dependent Claim
47 words
The method of claim 1 wherein the step of securing each journal pin to a respective leg comprises the steps of forming interengaging threads on each journal pin and the bore of each leg and threading each journal pin into the threaded bore of a respective leg.
Claim 5
Dependent Claim
66 words
The method of claim 1 further comprising the steps of aligning the bore of each thrust member with a bore of a respective leg when the subassemblies are positioned within said open area, inserting the portion of each journal pin extending into the cavity of a respective cone cutter into the bore of the thrust member, and securing each journal pin to the registering thrust element.
Claim 6
Dependent Claim
44 words
The method of claim 4 wherein the step of securing each journal pin to the registering thrust element comprises the step of projecting a high energy beam along the mating surfaces of the thrust element and the journal pin to fuse the surfaces together.
Claim 7
Dependent Claim
50 words
The method of claim 4 wherein the step of securing each journal pin to the registering thrust element comprises the steps of forming interengaging threads on each journal pin and the bore of each thrust member and threading each journal pin into the threaded bore of the respective thrust member.
Claim 8
Dependent Claim
55 words
The method of claim 5 wherein the bore of each leg is the same diameter as the bore of the respective thrust member, and a single high energy beam extends from the exterior of the leg to simultaneously fuse the journal pin to the mating surfaces of the leg bore and the thrust element bore.
Claim 9
Dependent Claim
90 words
The method of claim 2 wherein each journal pin has an end face perpendicular to the journal axis and which extends out of the external surface of the respective leg when in its operative position, and each leg has a raised portion with respect to the remaining external surface to engage the extended portion of the journal pin, including the additional step of removing the extended portion of each journal pin and the raised portion of each leg until those surfaces are flush with the external surface of the leg.
Claim 10
Dependent Claim
43 words
The method of claim 1 wherein the step of securing the annular member to the cone cutter comprises the step of projecting a high energy beam along the mating surfaces of the annular member and the cone cutter to fuse the surfaces together.
Claim 11
Dependent Claim
91 words
The method of claim 1 further comprising the steps of forming an annular groove on each journal pin, positioning one of said thrust elements within each groove, each thrust element having an outer surface for engaging the interior surface of the cutter cone, forming an access aperture in each journal pin to provide a line of sight from the exterior side of the leg to the mating surfaces of the thrust element and the cone cutter and projecting a high energy beam through each aperture to fuse the mating surfaces together.
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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) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |