US5159857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixed cutter bit with improved diamond filled compacts
Assignee: Hughes Tool Co
•
Filing: 1991-03-01
•
Granted: 1992-11-03
•
Expires: 2011-03-01
Abstract
Abstract In an improved single piece earth boring bit of the type having a body including a solid bit face on one end and a shank on the opposite end for connection in a drill string, an improved cutting structure having diamond filled compacts used as a wear resistant inserts. The improved compacts have hard metal jackets and integrally formed diamond cores. The improved compacts are advantageously used as wear resistant inserts in the gage and heel rows of the bit.
Inventors
- 👤 Stephen R. Jurewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:39
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; E; E21; E21B; E21B10/00; E21B10/46; E21B10/50; E21B10/52; E21B10/56; E21B10/567; E21B10/5676; Y; Y10; Y10S; Y10S76/00; Y10S76/11; Y10S76/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
185 words
A method of manufacturing an improved single piece bit of the type having a body including a solid bit face on one end, the bit face increasing in external diameter between a nose and a gage region, the method comprising the steps of: forming a diamond filled compact by first forming a hard metal jacket having at least one initially open end and an open interior; substantially filling the open interior of the jacket with a diamond material; subjecting the diamond filled jacket to a temperature and a pressure sufficient to sinter the diamond material, thereby integrally forming a diamond core within the hard metal jacket; reducing the outer dimensions of the hard metal jacket to a size selected to conform to a cutting insert pocket provided on the solid bit face, the improved compact being further characterized as having a top surface comprised of exposed diamond surrounded by a ring of jacket material and wherein at least 75% of the top surface of the compact is exposed diamond; and installing the improved compact within an insert receiving pocket provided on the solid bit face.
Claim 2
Independent Claim
185 words
A method of manufacturing an improved single piece bit of the type having a body including a solid bit face on one end, the bit face increasing in external diameter between a nose and a gage region, the method comprising the steps of: forming a diamond filled compact by first forming a hard metal jacket having at least one initially open end and an open interior; substantially filling the open interior of the jacket with a diamond material; subjecting the diamond filled jacket to a temperature and a pressure sufficient to sinter the diamond material, thereby integrally forming a diamond core within the hard metal jacket; reducing the outer dimensions of the hard metal jacket to a size selected to conform to a cutting insert pocket provided on the solid bit face, the improved compact being further characterized as having a top surface comprised of exposed diamond surrounded by a ring of jacket material and wherein at least 75% of the top surface of the compact is exposed diamond; and installing the improved compact within an insert receiving pocket provided on the solid bit face.
Claim 3
Dependent Claim
42 words
The method of claim 1, wherein the diamond material is selected from the group consisting of diamond powder and diamond powder blends formed by blending together diamond and a binder selected from the group consisting of Ni, Co, Fe, and alloys thereof.
Claim 4
Dependent Claim
15 words
The method of claim 2, wherein the hard metal jacket is a sintered metal carbide.
Claim 5
Dependent Claim
50 words
The method of claim 3, wherein the compact so formed is in the shape of a cylindrical diamond core having a radius surrounded by a jacket having cylindrical sidewalls of a generally uniform thickness, the jacket thickness being no greater than one half the radius of the cylindrical diamond core.
Claim 6
Dependent Claim
17 words
The method of claim 4, wherein at least 10% by volume of the compact is sintered diamond.
References Cited (Backward Citations)
US3694177A
Cited
US4164527A
Cited
US4109737A
Cited
US4148368A
Cited
US4073354A
Cited
US4110084A
Cited
US4140189A
Cited
US4457765A
Cited
US4268276A
Cited
US4221270A
Cited
US4531595A
Cited
US4373593A
Cited
US4246977A
Cited
US4260397A
Cited
US4248606A
Cited
US4370149A
Cited
US4380471A
Cited
US4431065A
Cited
US4764255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-03 | 1996-05-04 | 1996-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-03 | 2000-05-04 | 2000-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-03 | 2004-05-04 | 2004-11-03 | $7700.00 | Window Closed / Lapsed |