US3572769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe coupling
Assignee: Individual
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Filing: 1968-11-20
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Granted: 1971-03-30
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Expires: 1988-11-20
Abstract
Abstract A pipe coupling for joining the free ends of pipe, including a coupling sleeve and a pair of annular sealing rings that fit within channels on the inner surface of the sleeve, each channel being disposed so that it surrounds one of the pipes near its end and positions one of the sealing rings for engagement with the outer surface of the pipe. Each sealing ring is formed of a deformable material and is provided on its inner sealing surface with a plurality of annular ribs which deform when compressed inwardly into sealing engagement with the surface of the pipe. A filler compound that is initially, at least, sufficiently flowable to be injected into the channels around the sealing rings expands as it sets, compressing the sealing rings inward and forcing the ribbed inner surfaces of the rings into sealing engagement with the pipes.
Inventors
- 👤 Johann Lingl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:24
CPC Classifications
F; F16; F16L; F16L37/00; F16L37/62; F16L13/00; F16L13/10; F16L13/11; F16L17/00; F16L17/10; F16L21/00; F16L21/02; F16L21/022
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
247 words
A pipe coupling comprising an open-ended tubular sleeve into the opposite ends of which fit the ends of the pipes to be joined, said sleeve having on its inner surface a pair of annular channels spaced from each other axially of said sleeve, one of said channels being disposed such that it surrounds one of the pipes adjacent its end and the other of said channels being similarly disposed with respect to the other pipe, a deformable annular cup seal of U-shaped cross section disposed within each of said channels with the opening of the U facing outwardly toward the base of the channel to form an annular cavity within said channel, the inner faces of said annular cup seals having a plurality of continuous annular ribs that bear against the outer surfaces of the pipes, an expanding filler compound filling each of said annular cavities and comprising a self-setting material which expands as it hardens and which is capable of being introduced into said cavities under relatively light pressure as a fluid and then of expanding as it hardens in order to thrust said inner faces of said cup seals against the outer surfaces of the pipes under relatively high pressure, said annular ribs being deformed under the pressure exerted by the expansion of said filler compound thereby sealing the entire surface circumferentially of each of the pipes and providing a volume reserve for said expanding filler compound in order to prevent overstressing said tubular sleeve.
Claim 2
Dependent Claim
247 words
A pipe coupling comprising an open-ended tubular sleeve into the opposite ends of which fit the ends of the pipes to be joined, said sleeve having on its inner surface a pair of annular channels spaced from each other axially of said sleeve, one of said channels being disposed such that it surrounds one of the pipes adjacent its end and the other of said channels being similarly disposed with respect to the other pipe, a deformable annular cup seal of U-shaped cross section disposed within each of said channels with the opening of the U facing outwardly toward the base of the channel to form an annular cavity within said channel, the inner faces of said annular cup seals having a plurality of continuous annular ribs that bear against the outer surfaces of the pipes, an expanding filler compound filling each of said annular cavities and comprising a self-setting material which expands as it hardens and which is capable of being introduced into said cavities under relatively light pressure as a fluid and then of expanding as it hardens in order to thrust said inner faces of said cup seals against the outer surfaces of the pipes under relatively high pressure, said annular ribs being deformed under the pressure exerted by the expansion of said filler compound thereby sealing the entire surface circumferentially of each of the pipes and providing a volume reserve for said expanding filler compound in order to prevent overstressing said tubular sleeve.
Claim 3
Dependent Claim
61 words
A pipe coupling as defined in claim 1 wherein the outer surface of the pipe to be joined is relatively coarse, such as in sewer pipe, said annular ribs being resiliently deformable and tooth-shaped in cross section so that the inner edges of said ribs deform upon engagement with the pipe and conform to irregularities in the surface of the pipe.
Claim 4
Dependent Claim
26 words
A pipe coupling as defined in claim 1 wherein said filler compound comprises a fluid composition which expands and sets after being introduced into said cavities.
Claim 5
Dependent Claim
35 words
A pipe coupling as defined in claim 1 wherein said filler compound comprises a mixture of cement and aluminum powder that is initially fluid and which expands and sets after being introduced into said cavities.
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |