US4226291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reamer stabilizer for rock drills
Assignee: Individual
•
Filing: 1979-02-13
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Granted: 1980-10-07
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Expires: 1999-02-13
Abstract
Abstract A reamer and stabilizer assembly for rock drills having a substantially cylindrical body provided with a threaded end socket for connection to a drill stem, the body having circumferentially spaced longitudinally extending recesses for receiving reaming and stabilizer rollers mounted on axles extending parallel to the axis of the body, each reamer and roller assembly being removably retained in its recess by a keeper pin which can be inserted or retracted through a keeper pin passage opening into the threaded socket and into a longitudinal passage through each axle.
Inventors
- 👤 William R. Spelts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:28
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/23; E21B10/26; E21B10/28; E21B10/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
Reamer and stabilizer apparatus for rock drilling equipment comprising: (a) an elongated body member having a threaded socket at one end for connection to a threaded end of a drill stem, (b) means at the other end of the body member for connecting a drill bit thereto, (c) the body member having a plurality of circumferentially spaced recesses having longitudinally spaced apart end walls, (d) a plurality of roller units, each unit having an axle and a roller rotatably mounted thereon, and each axle having a slidable fit between the end walls of each of the recesses, (e) each axle having a longitudinally extending keeper pin passage opening out of the ends thereof, (f) bores extending between each recess wall and threaded socket aligned with the passages through the axles, (g) keeper pin retainer sockets opening out of the opposite end walls of the recesses aligned with the bores, (h) a keeper pin extendable through the threaded socket and through each axle passage and engaging an associated keeper pin socket for releasably securing the axles within the recesses, (i) means releasably secured to the body within the threaded socket for preventing withdrawal of the keeper pins from the respective axles.
Claim 2
Dependent Claim
200 words
Reamer and stabilizer apparatus for rock drilling equipment comprising: (a) an elongated body member having a threaded socket at one end for connection to a threaded end of a drill stem, (b) means at the other end of the body member for connecting a drill bit thereto, (c) the body member having a plurality of circumferentially spaced recesses having longitudinally spaced apart end walls, (d) a plurality of roller units, each unit having an axle and a roller rotatably mounted thereon, and each axle having a slidable fit between the end walls of each of the recesses, (e) each axle having a longitudinally extending keeper pin passage opening out of the ends thereof, (f) bores extending between each recess wall and threaded socket aligned with the passages through the axles, (g) keeper pin retainer sockets opening out of the opposite end walls of the recesses aligned with the bores, (h) a keeper pin extendable through the threaded socket and through each axle passage and engaging an associated keeper pin socket for releasably securing the axles within the recesses, (i) means releasably secured to the body within the threaded socket for preventing withdrawal of the keeper pins from the respective axles.
Claim 3
Dependent Claim
42 words
Apparatus as claimed in claim 1 in which each of the axles has extending end portions, said end portions having diametrically opposed flats, and seats formed in the end walls of each of the recesses for slidably receiving said axle end portions.
Claim 4
Dependent Claim
82 words
Apparatus as claimed in claim 1 in which the keeper pins have end portions extending into the socket, said end portions having diametrically opposed flats and in which the means for retaining the keeper pins connected to their respective axles comprises a plate adapted to be secured to the body against the threaded socket bottom, the plate having peripheral notches for accepting extending end portions of the keeper pins and bolts adapted to be extended through the plate into the body member.
Claim 5
Dependent Claim
22 words
Apparatus as claimed in claim 1 in which the keeper pin passages extending through the axles are located off-center of the latter.
Claim 6
Dependent Claim
64 words
Apparatus as claimed in claim 1 in which each of the keeper pins has a longitudinally extending fluid passage, a lateral passage intersecting said longitudinal passage and each axle has a lateral fluid passage normally aligned with said lateral passage through each of the keeper pins to enable passage of fluid from the threaded socket to the outer surface of each of the axles.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |