Patent US3858667A successfully refreshed from Google Patents.
US3858667A
Expired / Lapsed
US
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Big hole cutter
Assignee: SWEDEN FREEZER Inc A CORP OF INDIANA
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Filing: 1973-11-01
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Granted: 1975-01-07
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Expires: 1993-11-01
Abstract
Abstract A big hole cutter such as are employed in connection with raise drilling machines and box hole drilling machines in which a support frame is provided for connection to the drill string of the machine and on which support frame there is mounted rotary cutters on the side facing the formation to be reduced. The frame is a skeleton-like structure in that openings are provided extending axially therethrough which the muck and debris taken by the cutters can fall thereby preventing the cutter from becoming clogged up in operation. The big hole cutters for either raise drilling or box hole drill operations can include stabilizer rollers about the periphery to engage the surface of the hole being drilled and thereby stabilize the big hole cutter in the lateral direction. With raise drilling cutters, the actuating drill string connects to the cutter at the top and the raise drilling cutter is pulled upwardly while in a box hole machine the drill string connects to the bottom of the big hole cutter and the cutter is pushed upwardly. In respect of the big hole cutters for the last mentioned type of machine, the cutter also includes a pilot cutter extending axially from the upper end thereof and the aforementioned stabilizing rollers are particularly important for guiding the big hole cutter during working operations.
Inventors
- 👤 Robert D Goodfellow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:51
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/28
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
188 words
In a big hole cutter, especially for raise drilling and box hole drilling operations; a base structure adapted for rotation on a central axis, supports for rolling cutter devices mounted on the side of said base structure which faces the formation to be reduced and extending generally radially outwardly from said axis, and means on the axis of said base structure for connection of drill string means thereto for rotating said base structure while thrusting said base structure axially toward the side on which said rolling cutter supports are mounted, said base structure comprising inner and outer tubular members coaxial with the axis of rotation of said base structure, and substantially radial spoke elements disposed between and connected to said tubular members and circumferentially spaced to define axial channels through said base structure for the passage of debris taken by said rolling cutters, said spoke elements having the uppermost surfaces coplanar with the upper ends of the tubular members, at least some of said spoke elements being in the form of box beams made up of top and bottom and side plates and forming supports for rolling cutters.
Claim 2
Dependent Claim
188 words
In a big hole cutter, especially for raise drilling and box hole drilling operations; a base structure adapted for rotation on a central axis, supports for rolling cutter devices mounted on the side of said base structure which faces the formation to be reduced and extending generally radially outwardly from said axis, and means on the axis of said base structure for connection of drill string means thereto for rotating said base structure while thrusting said base structure axially toward the side on which said rolling cutter supports are mounted, said base structure comprising inner and outer tubular members coaxial with the axis of rotation of said base structure, and substantially radial spoke elements disposed between and connected to said tubular members and circumferentially spaced to define axial channels through said base structure for the passage of debris taken by said rolling cutters, said spoke elements having the uppermost surfaces coplanar with the upper ends of the tubular members, at least some of said spoke elements being in the form of box beams made up of top and bottom and side plates and forming supports for rolling cutters.
Claim 3
Dependent Claim
46 words
A big hole cutter according to claim 1 which includes a reinforcing plate in each box beam extending from the axial corner on one side of the beam at one end to the axial corner on the other side of the beam at the other end.
Claim 4
Dependent Claim
81 words
A big hole cutter according to claim 1 in which said box beams comprise one pair of beams on a first diameter of the base structure and a second pair of beams on a second diameter of the base structure which makes an angle different from a right angle with the first diameter, said spoke elements including radially extending axial plates between the most widely spaced ones of said box beams and connected at the radial ends to said tubular members.
Claim 5
Dependent Claim
38 words
A big hole cutter according to claim 1 which includes a stem for connection to drill pipe fixed in said inner tubular member and extending axially from said base structure on the side toward said rolling cutter supports.
Claim 6
Dependent Claim
26 words
A big hole cutter according to claim 1 which includes a plurality of rolling cutters in radially and circumferentially distributed relation mounted on said supports therefor.
Claim 7
Dependent Claim
38 words
A big hole cutter according to claim 1 in which said box beams comprise a plurality of beams distributed circumferentially in the space between said tubular members, each box beam adapted for supporting a respective said rolling cutter.
Claim 8
Dependent Claim
87 words
A big hole cutter according to claim 6 in which one diametral pair of said box beams is adapted for supporting a first pir of rolling cutters adjacent the axis of the base structure and another diametral pair of the beams is adapted for supporting a second pair of rolling cutters spaced radially outwardly from said first pair of rolling cutters, and means fixed to the outer periphery of said outer tubular member forming extensions of the upper surfaces of said other diametral pair of box beams.
Claim 9
Dependent Claim
77 words
A big hole cutter according to claim 1 in which said supports for rolling cutters include upwardly facing support plates, notches in the upper end of said outer tubular member through which said plates extend in a generally radial direction so as to protrude outwardly beyond the outer periphery of said outer member, and support bracket means beneath said plates connected thereto and to the outer periphery of said outer tubular member for supporting the said plates.
Claim 10
Dependent Claim
35 words
A big hole cutter according to claim 8 which includes lateral gusset plate means extending laterally between said support bracket means and the outer periphery of said outer member to support said bracket means laterally.
Claim 11
Dependent Claim
25 words
A big hole cutter according to claim 8 in which said support plates are arranged respective radial distances from the axis of said base structure.
Claim 12
Dependent Claim
34 words
A big hole cutter according to claim 1 in which said tubular structure comprises a central tube and an outer tube and substantially radial circumferentially spaced axial plate elements extending therebetween and fixed thereto.
Claim 13
Dependent Claim
24 words
A big hole cutter according to claim 11 which includes means at the bottom of said tubular structure for connection thereof to drill pipe.
Claim 14
Dependent Claim
30 words
A big hole cutter according to claim 12 which includes means to mount a pilot cutter on the axis of said base structure on the side opposite said tubular structure.
Claim 15
Dependent Claim
176 words
In a big hole cutter, especially for raise drilling and box hole drilling operations; a base structure adapted for rotation on a central axis, supports for rolling cutter devices mounted on the side of said base structure which faces the formation to be reduced and extending generally radially outwardly from said axis, and means on the axis of said base structure for connection of drill string means thereto for rotating said base structure while thrusting said base structure axially toward the side on which said rolling cutter supports are mounted, said base structure having axial channels there-through for the passage of debris taken by cutters on said supports, a tubular structure connected to the side of said base structure opposite said rolling cutter supports and coaxial with the base structure, and circumferentially and axially distributed support means on the outside of said tubular structure for receiving stabilizer rollers having the radially outermost regions in substantial axial alignment with the radially outermost regions of the rolling cutters mounted in the radially outer positions on said base structure.
Claim 16
Dependent Claim
176 words
In a big hole cutter, especially for raise drilling and box hole drilling operations; a base structure adapted for rotation on a central axis, supports for rolling cutter devices mounted on the side of said base structure which faces the formation to be reduced and extending generally radially outwardly from said axis, and means on the axis of said base structure for connection of drill string means thereto for rotating said base structure while thrusting said base structure axially toward the side on which said rolling cutter supports are mounted, said base structure having axial channels there-through for the passage of debris taken by cutters on said supports, a tubular structure connected to the side of said base structure opposite said rolling cutter supports and coaxial with the base structure, and circumferentially and axially distributed support means on the outside of said tubular structure for receiving stabilizer rollers having the radially outermost regions in substantial axial alignment with the radially outermost regions of the rolling cutters mounted in the radially outer positions on said base structure.
Claim 17
Dependent Claim
20 words
A big hole cutter according to claim 1 in which said base structure is in the form of a weldment.
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US2823900A
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US3011567A
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US3231029A
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US3675729A
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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) | 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 |