US4373593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: Norton Christensen Inc
•
Filing: 1980-03-10
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Granted: 1983-02-15
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Expires: 2000-03-10
Abstract
Abstract A rotary boring bit for boreholes comprises a body provided on its outer periphery with cutting members (6) consisting of a cutting portion (8) and a supporting portion (7), each cutting member being formed as a segment of a sintered body (1) having a core (3) of cutting material encased by a shell (2).
Inventors
- 👤 Cornelius Phaal
- 👤 Rainer Jurgens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:27
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/5673; B; B23; B23B; B23B27/00; B23B27/14; B23B27/141; B23B27/145; B23B27/148; B23P; B23P15/00; B23P15/28; B23P15/30; E21B10/48; E21B10/58; E21B10/60; B23B2226/00; B23B2226/31; Y; Y10; Y10T; Y10T407/00; Y10T407/27
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
82 words
A rotary boring bit for boreholes, comprising a body which is provided on its outer periphery with cutting members each of which consist of a supporting portion and a cutting portion disposed on the supporting portion, each cutting member being formed as a wedge shaped cut-out segment of a sintered body with a supporting portion surrounding the cutting portion as a casing at least at the periphery, said cutting portion being a material selected from compacted diamond and compacted cubic boron nitride.
Claim 2
Dependent Claim
82 words
A rotary boring bit for boreholes, comprising a body which is provided on its outer periphery with cutting members each of which consist of a supporting portion and a cutting portion disposed on the supporting portion, each cutting member being formed as a wedge shaped cut-out segment of a sintered body with a supporting portion surrounding the cutting portion as a casing at least at the periphery, said cutting portion being a material selected from compacted diamond and compacted cubic boron nitride.
Claim 3
Dependent Claim
35 words
A rotary boring bit as claimed in claim 1, in which the cutting member is a section of a sintered body having a supporting portion surrounding the cutting portion on all sides as a jacket.
Claim 4
Dependent Claim
30 words
A rotary boring bit as claimed in claim 1 or claim 2, in which the sintered body has the form of a cylinder for the formation of the cutting members.
Claim 5
Dependent Claim
32 words
A rotary boring bit as claimed in claim 1 or claim 2, in which the sintered body has the form of a polygonal straight prism for the formation of the cutting members.
Claim 6
Dependent Claim
27 words
A rotary boring bit as claimed in claim 2, in which the sintered body has the form of a sphere for the formation of the cutting member.
Claim 7
Dependent Claim
27 words
A rotary boring bit as claimed in claim 2, in which the sintered body has the form of a polyhedron for the formation of the cutting members.
Claim 8
Dependent Claim
27 words
A rotary boring bit as claimed in claim 1, in which the cutting portion is embedded coaxially or concentrically in the supporting part of the sintered body.
Claim 9
Dependent Claim
26 words
A rotary boring bit as in claim 7, in which the cutting portion has a star-shaped base shape with at least three ray-like wings in cross-section.
Claim 10
Dependent Claim
32 words
A rotary boring bit as claimed in claim 8, in which the wings are rounded in the region of their ends and in the region of their transition at the base side.
Claim 11
Dependent Claim
38 words
A rotary boring bit as claimed in claim 1, in which the supporting portion of the cutting members has less wear resistance in comparison with its cutting portion and more wear resistance in comparison with the basic body.
Claim 12
Dependent Claim
57 words
A rotary boring bit as claimed in claim 10, in which the cutting members are each secured to the basic body by means of a holding member, and in which the holding member has less wear resistance in comparison with the supporting portion of the cutting member and higher wear resistance in comparison with the basic body.
Claim 13
Dependent Claim
27 words
A rotary boring bit as claimed in claim 11, in which the holding member is provided with a coating encouraging a diffusion binding to the basic body.
References Cited (Backward Citations)
US1952002A
Cited
US2275021A
Cited
GB529529A
Cited
US3106973A
Cited
GB980799A
Cited
US3702573A
Cited
US3745623A
Cited
US4200159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |