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US3759554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe couplings
Assignee: Hepworth Plastics Ltd
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Filing: 1972-03-23
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Granted: 1973-09-18
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Expires: 1992-03-23
Abstract
Abstract A pipe coupling for socketed and spigoted plastics pipes with a sealing ring between the socket and the inserted spigot does not have any groove cut for locating the sealing ring, instead a portion of the spigot spaced from its ultimate end is expanded so as to be a close sliding fit in the socket, and a plastics sleeve is secured within the expanded portion of the spigot, the sealing ring being located on the portion of the spigot between the expanded portion and the ultimate end of the spigot. The principle of the invention is extended to the formation of grooves for a locking rod by expanding a second portion of the spigot still further from the ultimate end of the spigot, with its own internal plastics sleeve or an extension of the sleeve in the first expanded portion, the two expanded portions forming between them a circumferential groove round the outside of the spigot, and by expanding a portion of the socket to form a mating circumferential groove round the inside of the socket, the locking rod being inserted through a hole in the socket tangential to the grooves.
Inventors
- 👤 R Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:25
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/14; F16L13/16; F16L13/161; F16L37/00; F16L37/08; F16L37/12; F16L37/14; F16L37/142; F16L37/148; F16L47/00; F16L47/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
233 words
A pipe coupling including substantially rigid socketed and spigoted plastic pipes of substantially constant and equal wall thickness and nominal diameter, the socket and the inserted spigot integrally pre-formed in the pipe with a sealing ring therebetween and comprising: a first portion of the spigot spaced from its ultimate end expanded so as to be a close sliding fit in the socket, said socket being expanded to receive said first portion so that no reduction of the nominal diameter of said pipes including the coupling is necessary, a second portion of the spigot between the expanded portion and the ultimate end of the spigot, said second portion being substantially the same nominal diameter as said pipes, said sealing ring being located on said second portion and cooperating with said expanded socket, a third and expanded portion of the spigot still farther from the ultimate end of the spigot than said second portion, the two expanded portions forming between them a circumferential indentation round the outside of the spigot, said indentation being substantially the same nominal diameter as said pipes, a portion of the expanded socket being expanded still further to form a circumferential groove round the inside of the socket mating with said indentation on the spigot and a flexible locking rod inserted through a hole in the socket tangential to the mated indentation and groove to lock the coupling against axial separation.
Claim 2
Dependent Claim
233 words
A pipe coupling including substantially rigid socketed and spigoted plastic pipes of substantially constant and equal wall thickness and nominal diameter, the socket and the inserted spigot integrally pre-formed in the pipe with a sealing ring therebetween and comprising: a first portion of the spigot spaced from its ultimate end expanded so as to be a close sliding fit in the socket, said socket being expanded to receive said first portion so that no reduction of the nominal diameter of said pipes including the coupling is necessary, a second portion of the spigot between the expanded portion and the ultimate end of the spigot, said second portion being substantially the same nominal diameter as said pipes, said sealing ring being located on said second portion and cooperating with said expanded socket, a third and expanded portion of the spigot still farther from the ultimate end of the spigot than said second portion, the two expanded portions forming between them a circumferential indentation round the outside of the spigot, said indentation being substantially the same nominal diameter as said pipes, a portion of the expanded socket being expanded still further to form a circumferential groove round the inside of the socket mating with said indentation on the spigot and a flexible locking rod inserted through a hole in the socket tangential to the mated indentation and groove to lock the coupling against axial separation.
Claim 3
Dependent Claim
31 words
A pipe coupling as in claim 1, wherein the socket is encircled by a reinforcing collar, said collar having an enlarged portion to accommodate the groove forming expansion of said socket.
Claim 4
Dependent Claim
34 words
A pipe coupling as in claim 1, wherein the first and third expanded portions of the spigot are provided with internal reinforcing sleeves, said sleeves being substantially the same nominal diameter as said pipes.
Claim 5
Dependent Claim
32 words
A pipe coupling as in claim 3, wherein the sleeves for said first and third expanded portions of the spigot are provided with an annular connection to resist deformation of the spigot.
References Cited (Backward Citations)
GB533751A
Cited
US3260540A
Cited
GB1097192A
Cited
US3545794A
Cited
US3606402A
Cited
US3662761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |