US3608933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lock ring assembly for locking threaded shouldered joints
Assignee: Bowen Tools Inc
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Filing: 1969-08-22
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Granted: 1971-09-28
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Expires: 1989-08-22
Abstract
Abstract A lockring assembly for resisting disconnecting torque in a threaded coupling for connecting adjacent pipes wherein such assembly includes a pair of circular members adapted to be positioned between opposed shoulders in the coupling and wherein the circular members have outer gripping surfaces for gripping the opposed shoulders when the threaded connection is tightened together. The circular members also include interengaging cam surfaces which mesh together upon such tightening and which urge the pipes axially apart as they are rotated in a disconnecting direction relative to each other to thereby resist such rotation. The invention also includes means for holding the circular members against rotation relative to each other to prevent such intermeshing cam surfaces urging the threaded joints axially apart to thereby avoid interference with loosening and disconnecting such pipes.
Inventors
- 👤 William T Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:18
CPC Classifications
F; F16; F16L; F16L15/00; F16L15/006; F16L15/008; E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; E21B17/043; F16B; F16B39/00; F16B39/22; F16B39/24; F16B2200/00; F16B2200/69; F16B2200/73; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/956
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
171 words
A pipe-coupling apparatus for resisting disconnecting torque between adjoining thread-connected pipes in a drill sting including: a. two adjoining pipes having a direct threaded connection without tool joints therebetween and annular shoulders formed adjacent such thread connection; b. a lockring assembly comprising a pair of circular members disposed between said annular shoulders of said adjoining pipes; c. an external knurled surface on each of said circular members for gripping engagement with said annular shoulders when the threaded connection between said pipes is tightened; d. cam surfaces on the adjacent surfaces of said pair of circular members for urging said tubular members axially apart when said pipes are subjected to disconnecting torque relative to one another; e. said circular members having inner and outer diameters corresponding to the inner and outer diameters, respectively, of said annular shoulders; and f. a plurality of circumferentially disposed notches in said circular members adapted to receive means for holding said circular members against rotation relative to each other to permit disconnecting rotation of said tubular members.
Claim 2
Dependent Claim
171 words
A pipe-coupling apparatus for resisting disconnecting torque between adjoining thread-connected pipes in a drill sting including: a. two adjoining pipes having a direct threaded connection without tool joints therebetween and annular shoulders formed adjacent such thread connection; b. a lockring assembly comprising a pair of circular members disposed between said annular shoulders of said adjoining pipes; c. an external knurled surface on each of said circular members for gripping engagement with said annular shoulders when the threaded connection between said pipes is tightened; d. cam surfaces on the adjacent surfaces of said pair of circular members for urging said tubular members axially apart when said pipes are subjected to disconnecting torque relative to one another; e. said circular members having inner and outer diameters corresponding to the inner and outer diameters, respectively, of said annular shoulders; and f. a plurality of circumferentially disposed notches in said circular members adapted to receive means for holding said circular members against rotation relative to each other to permit disconnecting rotation of said tubular members.
Claim 3
Dependent Claim
26 words
The structure of claim 1, including: a. clamp means for engaging in said notches when said notches in said circular members are aligned with each other.
Claim 4
Dependent Claim
75 words
The structure set forth in claim 1, wherein: a. said annular shoulders are disposed laterally inwardly of the external surface of said pipes to form an annular recess for receiving said circular members; and b., said side surfaces of said circular members being substantially in alignment with the external surface of said pipes so that no substantial projection therefrom occurs which might interfere with movement of the pipes in a well bore or the like.
Claim 5
Dependent Claim
27 words
The structure of claim 1, wherein said cam surfaces include a plurality of interengaging inclined surfaces formed on said adjacent surfaces of said pair of circular members.
Claim 6
Dependent Claim
48 words
The structure of claim 1, wherein said cam surfaces include a plurality of interengaging inclined surfaces formed on said adjacent surfaces of said pair of circular members, said surfaces being inclined in the same direction but at a greater degree of pitch than the threads connecting said pipes.
Claim 7
Dependent Claim
38 words
The structure of claim 1, wherein each of said notches in the cylindrical side surfaces of said circular members has inclined sides and a transverse base, said notches being disposed on diametrically opposite sides of said circular members.
Claim 8
Dependent Claim
40 words
The structure set forth in claim 2, wherein said clamp means includes: a. a clamp having a lug adapted to be inserted into each of said notches; and b. means for releasably securing said lugs in said notches when aligned.
Claim 9
Dependent Claim
42 words
The structure of claim 2, wherein said clamp means includes: a. a clamp having a movable wedge-shaped lug and a fixed wedge-shaped lug adapted to be inserted into said notches to hold said circular members against disconnecting rotation relative to each other.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |