US3741570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible joint for sewer pipe
Assignee: Individual
•
Filing: 1970-11-16
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Granted: 1973-06-26
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Expires: 1990-11-16
Abstract
Abstract A flexible joint for sewer pipe, particularly clay pipe, for connecting a bell pipe section and a spigot pipe section, in which the bell section has an internal circumferential rib forming a support for the spigot end and upon which it may fulcrum during relative tilting movements of the sections. The inner surface of the bell is relieved on one side of the supporting rib, and on the other side is formed with a groove for a sealing gasket of resilient deformable material, such as rubber, the groove having a peripheral space or cavity into which the gasket material can flow or expand under operating applied compression forces.
Inventors
- 👤 B Garrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:16
CPC Classifications
F; F16; F16L; F16L27/00; F16L27/10; F16L27/1017; F16L21/00; F16L21/02; F16L21/03
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
186 words
A pipe joint for connecting the bell end of one pipe section and an inserted spigot end of an adjoining pipe section, comprising: a. an annular radial abutment flange axially inwardly spaced from the mouth of the bell providing a stop for engaging and positioning the end of the inserted spigot; b. an internal circumferential rib in the bell positioned between said flange and the bell mouth, said rib having a rounded inner edge adapted to loosely surround the inserted spigot end and form a fulcrum support therefor, the inner surface of said bell between said abutment flange and said rib, and the inner surface at the bell mouth being radially outwardly relieved to permit tilting movement of the inserted spigot end portion on the fulcrum support; c. a circumferentially extending radially inwardly opening groove in the inner surface of said bell on the outer side of said rib; and d. an annular gasket of resilient deformable material seated in said groove and being so dimensioned as to have compressed sealing engagement with the outer facing surface of the inserted spigot end during said tilted movements.
Claim 2
Dependent Claim
186 words
A pipe joint for connecting the bell end of one pipe section and an inserted spigot end of an adjoining pipe section, comprising: a. an annular radial abutment flange axially inwardly spaced from the mouth of the bell providing a stop for engaging and positioning the end of the inserted spigot; b. an internal circumferential rib in the bell positioned between said flange and the bell mouth, said rib having a rounded inner edge adapted to loosely surround the inserted spigot end and form a fulcrum support therefor, the inner surface of said bell between said abutment flange and said rib, and the inner surface at the bell mouth being radially outwardly relieved to permit tilting movement of the inserted spigot end portion on the fulcrum support; c. a circumferentially extending radially inwardly opening groove in the inner surface of said bell on the outer side of said rib; and d. an annular gasket of resilient deformable material seated in said groove and being so dimensioned as to have compressed sealing engagement with the outer facing surface of the inserted spigot end during said tilted movements.
Claim 3
Dependent Claim
31 words
A pipe joint according to claim 1, wherein said groove includes a space for the expansion of said gasket under compression forces in its operating sealing engagement with said spigot end.
Claim 4
Dependent Claim
47 words
A pipe joint according to claim 1, wherein said groove has a radially outer wall portion, an outer end wall portion and an inner end wall portion, and said gasket has a radially inwardly extending protuberance projecting beyond said groove into engagement with the coupled spigot end.
Claim 5
Dependent Claim
31 words
A pipe joint according to claim 3, wherein said protuberance in a relaxed condition of said gasket has an inner diameter less than the outer diameter of the coupled spigot end.
Claim 6
Dependent Claim
29 words
A pipe joint according to claim 3, wherein the radially outer wall of said groove has a peripheral cavity for the expansion of the gasket material under compression forces.
Claim 7
Dependent Claim
23 words
A pipe joint according to claim 3, wherein said gasket has inwardly extending edge flap extensions positioned on opposite sides of said protuberance.
Claim 8
Dependent Claim
20 words
A pipe joint according to claim 6, wherein said flap extensions diverge inwardly and are tapered towards their free edges.
Claim 9
Dependent Claim
151 words
As an article of manufacture, a sewer pipe having a bell connection end, the improvement comprising: a. an internal generally cylindrical surface in said bell end with an annular radial abutment shoulder axially inwardly spaced from the mouth of the bell; b. an internal circumferential rib in the bell axially positioned between said shoulder and the bell mouth, said rib having a rounded inner edge providing a bore opening of a diameter greater than the inner diameter of said annular shoulder; c. radially outwardly relieved cylindrical wall portions in said bell extending from said abutment shoulder to said rib and from said rib to the bell moUth; and d. a circumferentially extending radially inwardly opening groove on the bell mouth side of said rib, said groove having side and bottom walls in right-angled relation, and said bottom wall having a radially outwardly projecting portion formed to provide a circumferentially extending cavity.
Claim 10
Dependent Claim
151 words
As an article of manufacture, a sewer pipe having a bell connection end, the improvement comprising: a. an internal generally cylindrical surface in said bell end with an annular radial abutment shoulder axially inwardly spaced from the mouth of the bell; b. an internal circumferential rib in the bell axially positioned between said shoulder and the bell mouth, said rib having a rounded inner edge providing a bore opening of a diameter greater than the inner diameter of said annular shoulder; c. radially outwardly relieved cylindrical wall portions in said bell extending from said abutment shoulder to said rib and from said rib to the bell moUth; and d. a circumferentially extending radially inwardly opening groove on the bell mouth side of said rib, said groove having side and bottom walls in right-angled relation, and said bottom wall having a radially outwardly projecting portion formed to provide a circumferentially extending cavity.
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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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |