US3858671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excavating tool
Assignee: Atlas Copco Canada Inc
•
Filing: 1973-04-23
•
Granted: 1975-01-07
•
Expires: 1993-04-23
Abstract
Abstract An excavating tool or bit for drilling holes in earth formations in which the bit has a body with a working face on one end that is provided with hard wear resistant carbide inserts. The inserts on the working end of the body include peripheral gauge inserts and disposed in the side of the body, preferably in axial alignment with the gauge inserts, are other inserts also for holding gauge and advantageously having square outer ends with the diagonals of the squares arranged vertically and horizontally. More than one row of the side gauge inserts can be provided in the bit body.
Inventors
- 👤 John F Kita
- 👤 David C Johnstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:06
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
189 words
In a mining bit; a bit body having a working face at the front end and a peripheral wall extending rearwardly from said working face, inserts mounted in the front end of said body and distributed over said working face and protruding axially therefrom, at least one row of gauge inserts mounted in the front end of said body near the juncture of said working face and said peripheral wall and extending angularly from the body so as to protrude radially outwardly beyond said peripheral wall and axially outwardly beyond said front end, and at least one row of Further inserts extending radially into the peripheral wall of said body in circumferentially spaced relation and spaced axially along said peripheral wall from said gauge inserts, each said further insert having a radially extending sharp cutting edge on each of the axially upwardly and axially downwardly facing sides thereof, the radially outer end of each said further insert being disposed radially inwardly from the cylindrical envelope of the radially outermost points on said gauge inserts a fraction of the amount which the gauge inserts protrude radially beyond said peripheral wall.
Claim 2
Dependent Claim
189 words
In a mining bit; a bit body having a working face at the front end and a peripheral wall extending rearwardly from said working face, inserts mounted in the front end of said body and distributed over said working face and protruding axially therefrom, at least one row of gauge inserts mounted in the front end of said body near the juncture of said working face and said peripheral wall and extending angularly from the body so as to protrude radially outwardly beyond said peripheral wall and axially outwardly beyond said front end, and at least one row of Further inserts extending radially into the peripheral wall of said body in circumferentially spaced relation and spaced axially along said peripheral wall from said gauge inserts, each said further insert having a radially extending sharp cutting edge on each of the axially upwardly and axially downwardly facing sides thereof, the radially outer end of each said further insert being disposed radially inwardly from the cylindrical envelope of the radially outermost points on said gauge inserts a fraction of the amount which the gauge inserts protrude radially beyond said peripheral wall.
Claim 3
Dependent Claim
28 words
A mining bit according to claim 1 in which a said further insert is disposed in each axial plane of the bit body which contains a gauge insert.
Claim 4
Dependent Claim
38 words
A mining bit according to claim 1 in which the radially outer end of each further insert is rectangular in cross section with a diagonally of the rectangle disposed in a vertical axial plane of the bit body.
Claim 5
Dependent Claim
44 words
A mining bit according to claim 1 in which each gauge insert has a said further insert in axial alignment therewith, each said further insert having a radially extending sharp cutting edge on each of the axially upwardly and axially downwardly facing sides thereof.
Claim 6
Dependent Claim
84 words
A mining bit according to claim 1 in which the further inserts in said one row thereof are in axial alignment with respective ones of said gauge inserts, and an additional row of said further inserts axially displaced along said peripheral wall from said one row and circumferentially staggered relative to the said further inserts of said one row thereof, the inserts of said additional row thereof also having radially extending sharp edges formed on the axially upwardly and axially downwardly facing sides thereof.
Claim 7
Dependent Claim
17 words
An insert according to claim 1 in which said hard wear resistant material comprises cemented tungsten carbide.
Claim 8
Dependent Claim
37 words
An insert according to claim 1 in which the radially outer end of each said further insert is disposed about 0.010 inches radially inwardly from the cylindrical envelope of the radially outermost points of said gauge inserts.
References Cited (Backward Citations)
US1039909A
Cited
US3268260A
Cited
US3258077A
Cited
US3356418A
Cited
US3269470A
Cited
US3346060A
Cited
US3536150A
Cited
US3548959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |