US4047583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth boring cutting element retention system
Assignee: Tamrock Canada Inc
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Filing: 1976-06-01
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Granted: 1977-09-13
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Expires: 1996-06-01
Abstract
Abstract An earth boring apparatus includes individual cutting elements positioned within corresponding individual sockets in the cutter member body of the apparatus. Each socket has a socket wall and each cutting element has a lower body portion with a surface that contacts the socket wall. In one embodiment the sockets are cylindrical and a substantial portion of the lower body surfaces have a conical taper. This provides an improved fit of the lower body surface along the length of the socket wall and reduces cutting element loss.
Inventors
- 👤 Norman Dean Dyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:14
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/50; E21B10/52
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
In an earth boring apparatus having a body member retaining at least one insert, wherein upon assembly of said insert in said body member said insert is positioned in a socket in the body member, said socket having a socket wall and a socket bottom and said insert having a lower body portion and a lower end, the improvement comprising: at least a substantial annular portion of one of said said socket wall and lower body portion being tapered and the other of said socket wall and lower body portion being cylindrical so that said socket wall and lower body portion tend to diverge toward said socket bottom and lower end, said socket wall and lower body portion being in contact when said insert is positioned in said socket in said body member.
Claim 2
Dependent Claim
133 words
In an earth boring apparatus having a body member retaining at least one insert, wherein upon assembly of said insert in said body member said insert is positioned in a socket in the body member, said socket having a socket wall and a socket bottom and said insert having a lower body portion and a lower end, the improvement comprising: at least a substantial annular portion of one of said said socket wall and lower body portion being tapered and the other of said socket wall and lower body portion being cylindrical so that said socket wall and lower body portion tend to diverge toward said socket bottom and lower end, said socket wall and lower body portion being in contact when said insert is positioned in said socket in said body member.
Claim 3
Dependent Claim
48 words
In the earth boring apparatus of claim 1, one of said socket wall and lower body portion having a tapered surface, said tapered surface being tapered at an angle wherein the sine of the angle is less than the coefficient of friction of the insert and body member.
Claim 4
Dependent Claim
82 words
In a rock drill bit having an insert receiving socket for receiving a hardened insert, wherein the socket has an inner wall and the insert has an outer wall and a lower end, the improvement comprising: said socket inner wall being cylindrical and said insert outer wall having a substantial tapered portion extending along substantially the entire outer wall, tapering inward toward said lower end, said socket inner wall contacting said insert outer wall when said insert is within said receiving socket.
Claim 5
Dependent Claim
82 words
In a rock drill bit having an insert receiving socket for receiving a hardened insert, wherein the socket has an inner wall and the insert has an outer wall and a lower end, the improvement comprising: said socket inner wall being cylindrical and said insert outer wall having a substantial tapered portion extending along substantially the entire outer wall, tapering inward toward said lower end, said socket inner wall contacting said insert outer wall when said insert is within said receiving socket.
Claim 6
Dependent Claim
15 words
In the rock drill bit of claim 3, said tapered portion being a self-locking taper.
Claim 7
Dependent Claim
51 words
In a rock drill bit having an insert receiving socket for receiving a hardened insert, wherein the socket has an inner wall and bottom and the insert has an outer wall, the improvement comprising: said socket inner wall being tapered outward toward said bottom and said insert outer wall being cylindrical.
Claim 8
Dependent Claim
51 words
In a rock drill bit having an insert receiving socket for receiving a hardened insert, wherein the socket has an inner wall and bottom and the insert has an outer wall, the improvement comprising: said socket inner wall being tapered outward toward said bottom and said insert outer wall being cylindrical.
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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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |