US3679009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary cutter for excavation, especially for use with raise boring and tunnel boring machines
Assignee: Kennametal Inc
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Filing: 1971-02-02
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Granted: 1972-07-25
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Expires: 1991-02-02
Abstract
Abstract The specification discloses a rotary cutter in which a central support is mounted in a yoke or other supporting structure and which central support rotatably carries a cutting element having a central annular rib in which is mounted hard wear resistant inserts, such as cemented metal carbide inserts.
Inventors
- 👤 Robert D Goodfellow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:53
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/10; E21B10/46; E21B10/50; E21B10/52
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
A cutter, especially for use in hole forming and enlarging during excavating procedures, and comprising; a support shaft, bearing means on said shaft, end members fixed to said shaft and confining said bearing means therebetween on said shaft, a rotary cutting member surrounding said shaft between said end members and supported on said bearing means, said rotary cutting member having at least one outwardly projecting annular riB, and inserts of a hard wear resistant material imbedded in said rib and distributed circumferentially and axially on said cutting member, said inserts comprising first inserts located centrally in said rib, and second inserts located along the sides of said rib.
Claim 2
Dependent Claim
108 words
A cutter, especially for use in hole forming and enlarging during excavating procedures, and comprising; a support shaft, bearing means on said shaft, end members fixed to said shaft and confining said bearing means therebetween on said shaft, a rotary cutting member surrounding said shaft between said end members and supported on said bearing means, said rotary cutting member having at least one outwardly projecting annular riB, and inserts of a hard wear resistant material imbedded in said rib and distributed circumferentially and axially on said cutting member, said inserts comprising first inserts located centrally in said rib, and second inserts located along the sides of said rib.
Claim 3
Dependent Claim
15 words
A cutter according to claim 1 in which said inserts comprise a cemented metal carbide.
Claim 4
Dependent Claim
13 words
A cutter according to claim 2 in which said carbide comprises tungsten carbide.
Claim 5
Dependent Claim
54 words
A cutter according to claim 1 in which said first inserts are spaced uniformly about the circumference of said rib and said second inserts are disposed in axially extending radial planes located about midway between each pair of first inserts whereby each first insert is centrally located within a group of four second inserts.
Claim 6
Dependent Claim
40 words
A cutter according to claim 4 in which said rib is ''''V'''' shaped and said first inserts are formed at the outer ends so as to conform to the shape of said rib, said second inserts having rounded outer ends.
Claim 7
Dependent Claim
98 words
A cutter according to claim 5 in which said rib is ''''V'''' shaped and said first inserts are formed at the outer ends so as to conform to the shape of said rib, said first inserts having the central axes thereof in the central radial plane of said rib whereby the lateral sides of said first inserts lie in a pair of further radial planes on opposite sides of said central radial plane, said second inserts having the axes thereof in common radial planes and the axially inner sides thereof substantially in one of said further radial planes.
Claim 8
Dependent Claim
26 words
A cutter according to claim 1 in which all of said inserts are rod-like, said rib having substantially radial bores in which said inserts are mounted.
Claim 9
Dependent Claim
19 words
A cutter according to claim 7 in which said first inserts are larger in diameter than said second inserts.
Claim 10
Dependent Claim
33 words
A cutter according to claim 8 in which said rib is ''''V'''' shaped and said first inserts are formed at the outer ends so as to conform to the shape of said rib.
References Cited (Backward Citations)
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US2121202A
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US2223864A
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US2774570A
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US3191699A
Cited
US3385385A
Cited
US3593812A
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |