Patent US3552505A successfully refreshed from Google Patents.
US3552505A
Expired / Lapsed
US
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Core bit and core crusher apparatus
Assignee: American Coldset Corp
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Filing: 1968-11-22
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Granted: 1971-01-05
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Expires: 1988-11-22
Abstract
Abstract A well-boring apparatus is disclosed as including a core bit to cut material within a borehole in the form of a core during a well-drilling operation and a core crusher to crush the core material between the wall of the borehole and the core crusher. The core bit and core crusher also include passages for delivering fluid to the bottom of the borehole to serve as a cutting fluid for the core bit and to flush the core material from the cutting surfaces of the core bit.
Inventors
- 👤 Charles T Thompson
- 👤 Frank B Kidd
- 👤 William R Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:43
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/02; E21B10/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
46 words
The combination of claim 1 wherein said relieved portion extends through an arcuate portion of the cylindrical surface of said cylindrical member which subtends an obtuse angle, the remaining portion of said cylindrical member having a substantially continuous cylindrical surface extending from adjacent said relieved portion.
Claim 2
Dependent Claim
88 words
The combination of claim 1 in which said relieved portion further includes an open channel extending axially along a portion of the length of said relieved portion adjacent the central axis of said cylindrical member, the surface of said open channel providing said core-engaging surface, the end of said open channel adjacent said one end of said relieved portion being substantially in alignment with the central passageway of the core bit, whereby said channel is adapted to receive and direct the core material generated by said core bit.
Claim 3
Dependent Claim
64 words
The combination of claim 1 and further comprising means for transferring a liquid through said core crusher and said cutting head to the surface thereof to flush drilled material away from the cutting head both outwardly between The wall of the drill and the body of the core bit and inwardly between the wall of the central passageway and the surface of the core.
Claim 4
Dependent Claim
32 words
The combination of claim 4 wherein said core bit and said core crusher are threadedly connected to one another, whereby a worn core bit can be replaced without changing the core crusher.
Claim 5
Dependent Claim
86 words
The combination of claim 5 wherein: the body of said core bit includes a female threaded portion; said core crusher includes a male threaded portion on one end for detachably mating with the threaded portion of the body of said core bit and an additional female threaded portion on the other end thereof for connecting said core crusher to a drill stem; and said cutting head of the core bit has the largest outside diameter of any part of said core bit and said core crusher.
Claim 6
Dependent Claim
103 words
The combination of claim 4 wherein said means for transferring a fluid through said core crusher and said core bit to said cutting head comprises: said core bit and core crusher each having surfaces in an interfacing relationship, said core crusher having a port disposed in said interfacing surface and a flow passage extending therefrom; said cutting head of said core bit having an outlet opening facing away from said core crusher; and said core bit having an inlet opening in said interfacing surface in alignment with said port and an additional flow passage extending from said inlet opening to said outlet opening.
Claim 7
Dependent Claim
24 words
The combination of claim 7 wherein said inlet opening comprises an annular groove in the body of the core bit at said interfacing surface.
Claim 8
Dependent Claim
138 words
The combination of claim 1 in which said relieved portion further includes an open channel extending axially along a portion of the length of said relieved portion adjacent the central axis of said cylindrical member, the surface of said open channel providing a portion of said core engaging surface, the end of said open channel adjacent said one end of said relieved portion being substantially in alignment with the central passageway of the core bit, said core-engaging surface having a portion spaced apart from said channel end adjacent said one end of said relieved portion and inclined outwardly toward the periphery of said cylindrical member in the direction of the other end of said channel, whereby said outwardly inclined portion of said core-engaging surface is adapted to deflect and fracture the core material generated by said core bit.
Claim 9
Dependent Claim
70 words
The combination of claim 9 wherein said core-engaging surface further comprises an additional portion disposed between said outwardly inclined portion of said core-engaging surface and said other end of said channel, said additional portion being more sharply inclined with respect to the central axis of said cylindrical member for applying increased fracturing forces on the core of material not broken up by said outwardly inclined portion of said core-engaging surface.
Claim 10
Dependent Claim
84 words
The combination of claim 9 wherein said core-sizing surface has an inner extremity extending adjacent the length of said channel and an outer extremity extending adjacent the periphery of said cylindrical member, the clearance between said core-sizing surface at its inner extremity and the wall of the borehole being at least equal to substantially the diameter of said central axis passageway, whereby the clearance between said core-sizing surface and the wall of the borehole is adapted to receive and crush the core material therein.
Claim 11
Dependent Claim
40 words
The combination of claim 11 wherein said core-sizing surface comprises a spiral cam whose surface extends substantially from one end of said open channel to the other end thereof and has its minimum radius of curvature at said inner extremity.
Claim 12
Dependent Claim
33 words
The combination of claim 12 wherein said spiral cam has a radius of curvature at said outer extremity thereof substantially equal to the radius of curvature of the periphery of said cylindrical member.
Claim 13
Dependent Claim
59 words
The combination of claim 13 wherein said core-sizing surface of said spiral caM includes a plurality of parallel grooves extending in planes disposed at substantially right angles to the central axis of said cylindrical member and forming lands therebetween, said lands being adapted to increase the unit compressive load on the broken core of material during the core-crushing operation.
Claim 14
Independent Claim
252 words
A method for removing a cylindrical core of material from a borehole, the core of material being produced by a core bit adapted to be rotated in a predetermined direction about the axis thereof and to be advanced along said axis in the direction of a cutting face thereof, said core bit having a central axial passageway extending therethrough for generating said cylindrical core, the method comprising the steps of: continually maintaining a length of the cylindrical core extending from the cutting face through the axial passageway of the core bit substantially along the axis thereof, the end portion of the cylindrical core material opposite the cutting face being disposed beyond the end of the central axial passageway which is opposite the cutting face thereof; rotationally deflecting the end portion of the cylindrical core material which is opposite said cutting face and which is beyond the end of the central axial passageway away from the axis of the core bit toward the wall of the borehole by the application of a rotating bending force to the periphery of the core of material to fracture the end portion transversely into increments and to release the same; directing the released increments outwardly toward the wall of the borehole; wedging the released increments between the core bit and the wall of the borehole to crush the core material; and urging the crushed material to move between the wall of the borehole and the core bit in a direction extending away from the cutting face thereof.
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |