US4533003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling apparatus and cutter therefor
Assignee: Drilex Systems Inc
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Filing: 1984-03-08
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Granted: 1985-08-06
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Expires: 2004-03-08
Abstract
Abstract An underreamer, hole opener, or expansible rotary drill bit including a body having a bore therethrough, an arm mounted at its upper end to the body, a conical cutter mounted for rotation on the lower end of each arm, a cup-shape thrust bearing between the cutter and the arm, a bolt through the arm to secure the cutter on the arm and means including a ball and groove between the bolt and the cutter to lock the bolt to the cutter. In the underreamer form of the present invention, the arms are pivotally mounted in slots in the body and means is provided for moving their arms to their cutting position with their lower ends positioned radially outward from the body.
Inventors
- 👤 Thomas F. Bailey
- 👤 John E. Campbell
- 👤 Allen K. Rives
- 👤 Nehal M. Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:14
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/32; E21B10/322; E21B10/08; E21B10/20; E21B10/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
119 words
A drilling apparatus comprising a body having a bore therethrough and a longitudinal slot in its wall, an arm mounted at its upper end to said body and having a pin extending from its lower end with a central bore therethrough, a conical cutter having formation cutting means around its outer periphery, a small diameter threaded bore, and an enlarged diameter counterbore defining a shoulder between said threaded bore and said counterbore, means extending through the pin bore of said arm and into said cutter bore to secure said cutter rotationally on said pin, and thrust bearing means including a cup-shaped bearing surrounding said pin and engaging said counterbore and the shoulder between said counterbore and said cutter bore.
Claim 2
Dependent Claim
119 words
A drilling apparatus comprising a body having a bore therethrough and a longitudinal slot in its wall, an arm mounted at its upper end to said body and having a pin extending from its lower end with a central bore therethrough, a conical cutter having formation cutting means around its outer periphery, a small diameter threaded bore, and an enlarged diameter counterbore defining a shoulder between said threaded bore and said counterbore, means extending through the pin bore of said arm and into said cutter bore to secure said cutter rotationally on said pin, and thrust bearing means including a cup-shaped bearing surrounding said pin and engaging said counterbore and the shoulder between said counterbore and said cutter bore.
Claim 3
Dependent Claim
43 words
An apparatus according to claim 1 wherein said means to secure said cutter includes a bolt having a head and a threaded shank and extending through the pin bore in said arm and engaging in said central internally threaded bore of said cutter.
Claim 4
Dependent Claim
18 words
An apparatus according to claim 2 including bearing means between the head of said bolt and said pin.
Claim 5
Dependent Claim
18 words
An apparatus according to claim 2 including means for locking said bolt in engagement within said threaded bore.
Claim 6
Dependent Claim
45 words
An apparatus according to claim 4 wherein said locking means includes an internal annular groove within said threaded bore, a bore extending transversely through the end of said shank, a ball in said transverse shank bore, and means for forcing said ball into said groove.
Claim 7
Dependent Claim
34 words
An apparatus according to claim 5 wherein said ball forcing means includes an axial bore through said bolt, a pin in said axial bore, and means retaining said pin in engagement with said ball.
Claim 8
Dependent Claim
112 words
A drilling apparatus comprising a body having a bore therethrough, an arm mounted at its upper end to said body and having a pin extending from its lower end with a central bore therethrough, a conical cutter having formation cutting means around its outer periphery, a small diameter central threaded bore, and an enlarged counterbore defining a shoulder between said threaded bore and said counter, means extending through the pin bore in said arm and into said cutter bore to secure said cutter rotationally on said pin, thrust bearing means surrounding said pin and fitting within said counterbore in a seated position on the shoulder between said counterbore and said cutter bore.
Claim 9
Dependent Claim
112 words
A drilling apparatus comprising a body having a bore therethrough, an arm mounted at its upper end to said body and having a pin extending from its lower end with a central bore therethrough, a conical cutter having formation cutting means around its outer periphery, a small diameter central threaded bore, and an enlarged counterbore defining a shoulder between said threaded bore and said counter, means extending through the pin bore in said arm and into said cutter bore to secure said cutter rotationally on said pin, thrust bearing means surrounding said pin and fitting within said counterbore in a seated position on the shoulder between said counterbore and said cutter bore.
Claim 10
Dependent Claim
54 words
An apparatus according to claim 7 wherein said conical cutter includes an internal recess to receive the lower end of said arm, a cup shaped thrust bearing in said recess between said cutter and the lower end of said arm, and means for retaining said cutter rotatively on the lower end of said arm.
Claim 11
Dependent Claim
15 words
An apparatus according to claim 7 including a plurality of arms with cutters mounted thereon.
Claim 12
Dependent Claim
107 words
An underreamer comprising a body having a bore therethrough and a plurality of slots in its wall, an arm pivotally mounted at its upper end to the body within each of said slots, means for moving the arms to their cutting position with their lower ends positioned radially outward from the body, a conical cutter mounted for rotation on the lower end of each arm, a cup-shape thrust bearing between the cutter and the arm, a bolt through the arm to secure the cutter on the arm and means including a ball and groove between the bolt and the cutter to lock the bolt to the cutter.
Claim 13
Dependent Claim
107 words
An underreamer comprising a body having a bore therethrough and a plurality of slots in its wall, an arm pivotally mounted at its upper end to the body within each of said slots, means for moving the arms to their cutting position with their lower ends positioned radially outward from the body, a conical cutter mounted for rotation on the lower end of each arm, a cup-shape thrust bearing between the cutter and the arm, a bolt through the arm to secure the cutter on the arm and means including a ball and groove between the bolt and the cutter to lock the bolt to the cutter.
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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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |