US3834744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe coupling
Assignee: Garlock Inc
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Filing: 1972-06-19
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Granted: 1974-09-10
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Expires: 1992-06-19
Abstract
Abstract A pipe coupling for use with a coupling shell for sealingly connecting together two adjoining pipe ends, said coupling including an elastomeric gasket overlying the pipe ends and the gap therebetween and a rigid back-up ring overlying the gasket and forming a cavity between the ring and gasket. Installation of the coupling shell compresses the gasket, and the central portion of the gasket over the gap, when forced to move, preferentially moves into the cavity and away from the gap. Several gasket-ring embodiments are described, and each one prevents the gasket from moving or being extruded into the gap between the pipe ends. The cavity is preferably formed as a groove in the I.D surface of the ring between two inwardly extending flanges; the flanges prevent all portions of the gasket except the underlying central portion from being able to move into and fill-up the cavity. The gasket has a cylindrical I.D. surface that can easily be provided with a corrosion resistant liner and that can easily slip over the adjoining pipe ends. The gasket-ring assembly can be used with conventional coupling shells and pipe ends, or the ring can be an integral part of a new coupling shell of this invention. The gasket also has recesses on its O.D. surface to prevent any elastomer from extending into the gaps between arcuate portions of the coupling shell.
Inventors
- 👤 M Masatchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:45
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/02; F16L23/024; F16L23/028; F16L23/0283; F16L21/00; F16L21/06; Y; Y10; Y10S; Y10S277/00; Y10S277/91; Y10T; Y10T24/00; Y10T24/14; Y10T24/1412; Y10T24/1441
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
305 words
A pipe coupling for sealingly connecting together two axially spaced-apart pipe ends comprising: a. an annular elastomeric gasket overlying said pipe ends with a central portion of said gasket overlying a gap between said pipe ends; b. a rigid annular back-up ring overlying said gasket and including a central portion having a cylindrical inner back-up surface overlying said central portion of said gasket, and said ring having a cylindrical outer surface; c. an annular pipe coupling shell installed over said gasket and ring and compressing said gasket into sealing contact with said pipe ends; d. said elastomeric gasket having a cylindrical inner surface and wherein the outer surface of said central portion of said gasket has a diameter smaller than the diameter of two end portions of said gasket, thus defining an annular central groove in the outer surface of said gasket, e. said ring being a separate element from said shell; f. a pair of spaced-apart, radially extending, annular shoulders, on one of said gasket and said ring, on opposite sides of said central portion of said ring and of said gasket, providing a cavity between the inner surface of said central portion of said ring and the outer surface of said central portion of said gasket, the diameter of the inner surface of said central portion of said ring being greater than the diameter of the outer surface of the central portion of said gasket, g. said shell including a cylindrical central portion having a cylindrical inner surface in contact with said cylindrical outer surface of said ring and engaging the end portions of said gasket, said shell also including two radially inwardly extending eNd portions defining a gasket chamber, said gasket chamber being completely filled up by said gasket and said ring when said shell is compressed onto said gasket and ring.
Claim 2
Dependent Claim
305 words
A pipe coupling for sealingly connecting together two axially spaced-apart pipe ends comprising: a. an annular elastomeric gasket overlying said pipe ends with a central portion of said gasket overlying a gap between said pipe ends; b. a rigid annular back-up ring overlying said gasket and including a central portion having a cylindrical inner back-up surface overlying said central portion of said gasket, and said ring having a cylindrical outer surface; c. an annular pipe coupling shell installed over said gasket and ring and compressing said gasket into sealing contact with said pipe ends; d. said elastomeric gasket having a cylindrical inner surface and wherein the outer surface of said central portion of said gasket has a diameter smaller than the diameter of two end portions of said gasket, thus defining an annular central groove in the outer surface of said gasket, e. said ring being a separate element from said shell; f. a pair of spaced-apart, radially extending, annular shoulders, on one of said gasket and said ring, on opposite sides of said central portion of said ring and of said gasket, providing a cavity between the inner surface of said central portion of said ring and the outer surface of said central portion of said gasket, the diameter of the inner surface of said central portion of said ring being greater than the diameter of the outer surface of the central portion of said gasket, g. said shell including a cylindrical central portion having a cylindrical inner surface in contact with said cylindrical outer surface of said ring and engaging the end portions of said gasket, said shell also including two radially inwardly extending eNd portions defining a gasket chamber, said gasket chamber being completely filled up by said gasket and said ring when said shell is compressed onto said gasket and ring.
Claim 3
Dependent Claim
61 words
The apparatus according to claim 1 wherein said shell is formed in a plurality of separate arcuate sections having gaps between abutting section ends and wherein said gasket has an axially extending recess on its outer surface for each gap between sections of said shell, and wherein said each recess is positioned directly underneath one of said gaps in said shell.
Claim 4
Dependent Claim
26 words
The apparatus according to claim 1 wherein said pair of shoulders form a part of said ring and extend radially inwardly into contact with said gasket.
Claim 5
Dependent Claim
26 words
The apparatus according to claim 1 wherein said pair of shoulders form a part of said gasket and extend radially outwardly into contact with said ring.
Claim 6
Dependent Claim
13 words
The apparatus according to claim 1 wherein said gasket is a one-piece member.
Claim 7
Dependent Claim
21 words
The apparatus according to claim 1 wherein said gasket is a three piece gasket including a cylindrical sleeve and two O-rings.
Claim 8
Dependent Claim
49 words
The apparatus according to claim 1 wherein said ring has an axial length less than that of said gasket chamber and wherein said gasket fills two axial end portions of said gasket chamber between each end of said ring and said radially inwardly extending end portions of said shell.
Claim 9
Dependent Claim
26 words
The apparatus according to claim 7 wherein said pair of shoulders form a part of said ring and extend radially inwardly into contact with said gasket.
Claim 10
Dependent Claim
13 words
The apparatus according to claim 8 wherein said gasket is a one-piece member.
Claim 11
Dependent Claim
21 words
The apparatus according to claim 8 wherein said gasket is a three piece gasket including a cylindrical sleeve and two O-rings.
Claim 12
Dependent Claim
26 words
The apparatus according to claim 7 wherein said pair of shoulders form a part of said gasket and extend radially outwardly into contact with said ring.
Claim 13
Dependent Claim
13 words
The apparatus according to claim 11 wherein said gasket is a one-piece member.
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |