US3573871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gasket for bell-type pipe joint
Assignee: TYLER PIPE COMPANY A DIVISION OF RANSOM INDUSTRIES Inc
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Filing: 1968-11-12
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Granted: 1971-04-06
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Expires: 1988-11-12
Abstract
Abstract A gasket preferably of rubber or other suitable elastomer for providing a seal and mechanical joint between the components of a telescoping-type joint such as customarily referred to as a belland-spigot-type joint or as a bell-type pipe joint. It is similar in some respects and in purpose to the gasket disclosed in U.S. Pat. No. 3,081,102, issued Mar. 12, 1963, for Gasket for Telescoping Joint, but has its exterior surface divided into two axially spaced sealing surfaces adapted to engage the interior of the bell, with a surface of slightly lesser diameter between them to partly relieve the friction between the gasket and the bell and make the gasket easier to insert into the bell. It also includes a sealing bead on the exterior sealing surface which is adapted to extend fartherest into the bell in use and so positioned that when being pushed into the bell it will tend to rotate such sealing surface in a direction to partly relieve the pressure thereof against the interior of the bell and thus facilitate the insertion of the gasket into the bell, but will inhibit rotation in the opposite direction to the original position and thereby strengthen certain of the seals. The reduction of the outer diameter of a part of the outer surface of the gasket facilitates such rotation of the sealing surface and relief of its pressure during insertion. The gasket also has a locking bead on the exterior sealing surface closest to the open end of the bell in use and this bead is joined to the portion of smaller exterior diameter by a tapered substantially conical portion which both makes it easier to start into the mouth of the bell during insertion and also makes it possible for this bead to lock into the locking grooves of various different shapes made by different pipe manufacturers without appreciable distortion.
Inventors
- 👤 John A Warner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:03
CPC Classifications
F; F16; F16L; F16L17/00; F16L17/02; F16L17/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
259 words
An annular resilient gasket for flexibly joining and sealing and mutually centering the interfitting components of a bell type pipe joint; comprising, an elastomer sleeve having a plurality of axially spaced exterior sealing surfaces each adapted to sealingly engage the interior of the bell component of such a joint when forced into same, and a plurality of axially spaced interior surfaces adapted to sealingly engage the exterior of the pipe and component of such joint when such component is forced into the sleeve, said interior surfaces being on outwardly deflectable annular liplike portions and said exterior surfaces being on relatively more rigid portions of the sleeve and said sleeve being continuous between said exterior sealing surfaces, the improvement which comprises, a portion of said sleeve between said exterior sealing surfaces being of smaller outer diameter than said external sealing surfaces but approximately as large as said external sealing surfaces when the latter are compressed inwardly sufficiently to form a seal within a bell componenT of a joint, whereby the friction of introduction of said sleeve into a bell is greatly reduced and the introduction facilitated and in which the improvement also includes a sealing bead between the exterior sealing surface adapted to be furtherest into the bell component in use and the portion of smaller diameter between said exterior sealing surfaces and projecting outwardly beyond said exterior sealing surfaces, whereby during introduction into a bell said bead tends to rotate the exterior surface to which it is adjacent in a direction to partly relieve its pressure against the bell.
Claim 2
Dependent Claim
259 words
An annular resilient gasket for flexibly joining and sealing and mutually centering the interfitting components of a bell type pipe joint; comprising, an elastomer sleeve having a plurality of axially spaced exterior sealing surfaces each adapted to sealingly engage the interior of the bell component of such a joint when forced into same, and a plurality of axially spaced interior surfaces adapted to sealingly engage the exterior of the pipe and component of such joint when such component is forced into the sleeve, said interior surfaces being on outwardly deflectable annular liplike portions and said exterior surfaces being on relatively more rigid portions of the sleeve and said sleeve being continuous between said exterior sealing surfaces, the improvement which comprises, a portion of said sleeve between said exterior sealing surfaces being of smaller outer diameter than said external sealing surfaces but approximately as large as said external sealing surfaces when the latter are compressed inwardly sufficiently to form a seal within a bell componenT of a joint, whereby the friction of introduction of said sleeve into a bell is greatly reduced and the introduction facilitated and in which the improvement also includes a sealing bead between the exterior sealing surface adapted to be furtherest into the bell component in use and the portion of smaller diameter between said exterior sealing surfaces and projecting outwardly beyond said exterior sealing surfaces, whereby during introduction into a bell said bead tends to rotate the exterior surface to which it is adjacent in a direction to partly relieve its pressure against the bell.
Claim 3
Dependent Claim
38 words
An annular gasket as in claim 1 in which the improvement includes a locking bead adjacent and projecting outwardly beyond the exterior sealing surface adapted to be closer to the open end of the bell component in use.
Claim 4
Dependent Claim
44 words
An annular gasket as in claim 2 in which the improvement includes said locking bead being adjacent said surface of smaller outer diameter and the outermost portion of said bead being joined to said surface of smaller diameter by a substantially conical tapered surface.
Claim 5
Dependent Claim
27 words
An annular gasket as in claim 2 in which the improvement includes the sealing bead projecting outwardly beyond said exterior sealing surfaces less than said locking bead.
Claim 6
Dependent Claim
257 words
An annular resilient gasket for flexibly joining and sealing and mutually centering the interfitting components of a bell type pipe joint; comprising, an elastomer sleeve having a plurality of axially spaced exterior sealing surfaces each adapted to sealingly engage the interior of the bell component of such a joint when forced into the same, and a plurality of axially spaced interior surfaces adapted to sealingly engage the exterior of the pipe end component of such joint when such component is forced into the sleeve, said interior surfaces being on outwardly deflectable annular liplike portions and said exterior surfaces being on relatively more rigid portions of the sleeve and said sleeve being continuous between said exterior sealing surfaces, the improvement which comprises, a portion of said sleeve between said exterior sealing surfaces being of smaller outer diameter than said external sealing surfaces but approximately as large as said external sealing surfaces when the latter are compressed inwardly sufficiently to form a seal within a bell component of a joint, whereby the friction of introduction of said sleeve into a bell is greatly reduced and the introduction facilitated, the improvement which also comprises a locking bead adjacent and projecting outwardly beyond the exterior sealing surface adapted to be closer to the open end of the bell component in use, said locking bead being adjacent said surface of smaller outer diameter and the outermost portion of said bead being substantially circular in cross section and and being joined to said surface of smaller diameter by a substantially conical tapered surface.
Claim 7
Dependent Claim
257 words
An annular resilient gasket for flexibly joining and sealing and mutually centering the interfitting components of a bell type pipe joint; comprising, an elastomer sleeve having a plurality of axially spaced exterior sealing surfaces each adapted to sealingly engage the interior of the bell component of such a joint when forced into the same, and a plurality of axially spaced interior surfaces adapted to sealingly engage the exterior of the pipe end component of such joint when such component is forced into the sleeve, said interior surfaces being on outwardly deflectable annular liplike portions and said exterior surfaces being on relatively more rigid portions of the sleeve and said sleeve being continuous between said exterior sealing surfaces, the improvement which comprises, a portion of said sleeve between said exterior sealing surfaces being of smaller outer diameter than said external sealing surfaces but approximately as large as said external sealing surfaces when the latter are compressed inwardly sufficiently to form a seal within a bell component of a joint, whereby the friction of introduction of said sleeve into a bell is greatly reduced and the introduction facilitated, the improvement which also comprises a locking bead adjacent and projecting outwardly beyond the exterior sealing surface adapted to be closer to the open end of the bell component in use, said locking bead being adjacent said surface of smaller outer diameter and the outermost portion of said bead being substantially circular in cross section and and being joined to said surface of smaller diameter by a substantially conical tapered surface.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |