US3870085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansible plugs for sewer pipes
Assignee: Individual
•
Filing: 1973-06-20
•
Granted: 1975-03-11
•
Expires: 1993-06-20
Abstract
Abstract An expansible plug for a sewer pipe includes a cylindrical expansible member, the ends of which are secured between discs which are arranged to permit the introduction of air or gas into and through the expansible plugs to hold the same in position and create pressure therebeyond.
Inventors
- 👤 Michael Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:55
CPC Classifications
E; E03; E03F; E03F7/00; E03F7/02; F; F16; F16L; F16L55/00; F16L55/10; F16L55/12; F16L55/128
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
195 words
An expansible plug consisting of a tubular core having spaced flanges inwardly of its ends, a cylindrical expansible member having thickened inturned ends positioned over said flanges so as to extend therebetween, annular ribs on said thickened inturned ends, apertured discs positioned on said tubular core beyond said flanges, annular grooves in said apertured discs and means for securing said apertured discs to said tubular core and in engagement with said thickened inturned ends of said expansible member with said ribs and grooves in registry, a plug in one end of said tubular core and a valve stem positioned in the other and whereby air introduced into said tubular core through said valve stem may communicate with said expansible member through an opening in said tubular core, secondary apertured discs on said tubular core on the opposite outer sides of said first mentioned apertured discs, the diameter of said secondary apertured discs being substantially larger than the diameter of said first mentioned apertured discs, and flexible means on one of said first mentioned apertured discs extending through an opening in one of said secondary apertured discs for retrieving said expansible plug from a sewer pipe.
Claim 2
Dependent Claim
195 words
An expansible plug consisting of a tubular core having spaced flanges inwardly of its ends, a cylindrical expansible member having thickened inturned ends positioned over said flanges so as to extend therebetween, annular ribs on said thickened inturned ends, apertured discs positioned on said tubular core beyond said flanges, annular grooves in said apertured discs and means for securing said apertured discs to said tubular core and in engagement with said thickened inturned ends of said expansible member with said ribs and grooves in registry, a plug in one end of said tubular core and a valve stem positioned in the other and whereby air introduced into said tubular core through said valve stem may communicate with said expansible member through an opening in said tubular core, secondary apertured discs on said tubular core on the opposite outer sides of said first mentioned apertured discs, the diameter of said secondary apertured discs being substantially larger than the diameter of said first mentioned apertured discs, and flexible means on one of said first mentioned apertured discs extending through an opening in one of said secondary apertured discs for retrieving said expansible plug from a sewer pipe.
Claim 3
Dependent Claim
195 words
An expansible plug consisting of a tubular core having spaced flanges inwardly of its ends, a cylindrical expansible member having thickened inturned ends positioned over said flanges so as to extend therebetween, annular ribs on said thickened inturned ends, apertured discs positioned on said tubular core beyond said flanges, annular grooves in said apertured discs and means for securing said apertured discs to said tubular core and in engagement with said thickened inturned ends of said expansible member with said ribs and grooves in registry, a plug in one end of said tubular core and a valve stem positioned in the other and whereby air introduced into said tubular core through said valve stem may communicate with said expansible member through an opening in said tubular core, secondary apertured discs on said tubular core on the opposite outer sides of said first mentioned apertured discs, the diameter of said secondary apertured discs being substantially larger than the diameter of said first mentioned apertured discs, and flexible means on one of said first mentioned apertured discs extending through an opening in one of said secondary apertured discs for retrieving said expansible plug from a sewer pipe.
Claim 4
Dependent Claim
195 words
An expansible plug consisting of a tubular core having spaced flanges inwardly of its ends, a cylindrical expansible member having thickened inturned ends positioned over said flanges so as to extend therebetween, annular ribs on said thickened inturned ends, apertured discs positioned on said tubular core beyond said flanges, annular grooves in said apertured discs and means for securing said apertured discs to said tubular core and in engagement with said thickened inturned ends of said expansible member with said ribs and grooves in registry, a plug in one end of said tubular core and a valve stem positioned in the other and whereby air introduced into said tubular core through said valve stem may communicate with said expansible member through an opening in said tubular core, secondary apertured discs on said tubular core on the opposite outer sides of said first mentioned apertured discs, the diameter of said secondary apertured discs being substantially larger than the diameter of said first mentioned apertured discs, and flexible means on one of said first mentioned apertured discs extending through an opening in one of said secondary apertured discs for retrieving said expansible plug from a sewer pipe.
Claim 5
Dependent Claim
34 words
The expansible plug of claim 1 and wherein the expansible member has a plurality of circumferentially spaced folds therein when in uninflated condition acting to expand the diameter of said expansible member during inflation.
Claim 6
Dependent Claim
50 words
The Expansible plug of claim 1 and wherein the expansible member has a plurality of circumferentially spaced folds therein when in uninflated condition acting to expand the diameter of said expansible member during inflation and wherein a plurality of annular ribs are formed on the exterior of said expansible member.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |