Patent US3689113A successfully refreshed from Google Patents.
US3689113A
Expired / Lapsed
US
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Coupling for pipes
Assignee: Leffer Stahl & App
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Filing: 1970-02-27
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Granted: 1972-09-05
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Expires: 1990-02-27
Abstract
Abstract This relates to couplings for pipes, especially boring pipes, where there is a requirement for a coupling which can be easily released yet provides for one pipe to be locked so as not to be able to rotate with respect to the other and also where the coupling is provided with a sealed joint, the coupling is made by intermeshing teeth or cogs on the ends of the pipes, the teeth being trapezoidally shaped so as to provide improved locking between the adjacent pipes; annular sealing rings may be provided on the inside of the teeth, the rings may have a seal between each other or between a ring and next of the adjacent pipe; an annular fastening ring is provided to fit in a recess formed circumferentially around the teeth.
Inventors
- 👤 Kurt Blaschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:33
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/08; E02; E02D; E02D5/00; E02D5/22; E02D5/52; E02D5/523; E02D5/66; E21B17/04; E21B17/046; F; F16; F16L; F16L25/00; F16L25/0018; Y; Y10; Y10S; Y10S285/00; Y10S285/913
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
176 words
A releasable coupling for connecting two pipes of a boring string, said coupling comprising an array of angularly equispaced cogs formed on one end of each of said pipes and interfitting complementarily with the cogs of the other pipe, said cogs each having a pair of flanks tapering axially in the direction of the other pipe and receivable in a recess complementary to the cog between the cogs of the other array, said cogs being formed along their external periphery with outwardly open channels aligned to form a circumferential groove in an interfitting condition of said arrays, a circumferential fastening element received in said groove and having a radial thickness at most equal to the radial depth of said groove whereby no portion of said fastening element projects outwardly beyond the peripheries of said pipes, and an axially extending ring inwardly of said cogs and sealingly bridging said pipes upon interfitting of said arrays of cogs, said flanks of said cogs each fully engaging the flanks of a pair of adjoining cogs of the opposing array.
Claim 2
Dependent Claim
176 words
A releasable coupling for connecting two pipes of a boring string, said coupling comprising an array of angularly equispaced cogs formed on one end of each of said pipes and interfitting complementarily with the cogs of the other pipe, said cogs each having a pair of flanks tapering axially in the direction of the other pipe and receivable in a recess complementary to the cog between the cogs of the other array, said cogs being formed along their external periphery with outwardly open channels aligned to form a circumferential groove in an interfitting condition of said arrays, a circumferential fastening element received in said groove and having a radial thickness at most equal to the radial depth of said groove whereby no portion of said fastening element projects outwardly beyond the peripheries of said pipes, and an axially extending ring inwardly of said cogs and sealingly bridging said pipes upon interfitting of said arrays of cogs, said flanks of said cogs each fully engaging the flanks of a pair of adjoining cogs of the opposing array.
Claim 3
Dependent Claim
61 words
The coupling defined in claim 1 wherein said ring includes respective steel ring members formed on each of said pipes along the interior of the respective array of cogs and axially aligned upon interfitting of said arrays to axially seal the coupling, each of said ring members having an axial length equal approximately to half the axial length of said cogs.
Claim 4
Dependent Claim
49 words
The coupling defined in claim 2 wherein at least one of said ring members is formed with an axial face confronting the other of said ring members and formed with an annular recess, said coupling further comprising a sealing ring in said recess and clamped between said ring members.
Claim 5
Dependent Claim
31 words
The coupling defined in claim 1 wherein said ring is fixed to one of said pipes and said cogs are formed internally with steps forming an annular seat for said ring.
Claim 6
Dependent Claim
36 words
The coupling defined in claim 4 wherein an annular recess is formed laterally in the pipe provided with said seat, said coupling further comprising a sealing ring in said annular recess hugging said axially extending ring.
Claim 7
Dependent Claim
23 words
The coupling as defined in claim 1, further comprising stop means on said fastening element for limiting displacement thereof relative to said cogs.
Claim 8
Dependent Claim
40 words
The coupling defined in claim 6 wherein at least one of said cogs is formed with an axially extending recess flanking said groove and said stop means includes a projection on said fastening element engaging in said axially extending recess.
Claim 9
Dependent Claim
32 words
The coupling defined in claim 6 wherein said fastening element is provided with a bore, said stop means including a screw traversing said bore and threadedly engaging said one of said cogs.
Claim 10
Dependent Claim
21 words
The coupling defined in claim 1, further comprising inner pipes having their endfaces almost in contact upon interengagement of said array.
Claim 11
Dependent Claim
27 words
The coupling defined in claim 1 wherein said cogs are generally trapezoidal and said flanks have inclinations of substantially 3* to 20*to the axis of said pipes.
References Cited (Backward Citations)
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Cited
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Cited
US3424477A
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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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |