Patent US3388380A successfully refreshed from Google Patents.
Patent US2477395A successfully refreshed from Google Patents.
US3749131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
End plug assembly for pipe
Assignee: Oliver Tire and Rubber Co
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Filing: 1971-07-21
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Granted: 1973-07-31
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Expires: 1991-07-21
Abstract
Abstract A plug assembly for sealing the open end of a pipe such as an unused lateral of a fluid conduit comprises a circular sealing member of elastomeric material supported between a pair of washer plates of different diameters. Means are provided for holding the washers in place and for drawing them together to compress the sealing member. When the washer plates are drawn together the sealing member is caused to deform and bulge outwardly to form a sealing peripheral contact with the inner pipe wall.
Inventors
- 👤 E Burger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:28
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/10; F16L55/12; F16L55/128; F16L55/132
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
262 words
A plug assembly for sealing the open end of a pipe having an annular end face, comprising: a circular sealing member of elastomeric material having a first portion with a cylindrical surface and an integral second portion with a continuous conical surface that flares outwardly from said cylindrical surface of said first portion to a greater diameter at the innermost end of said second portion, a transverse inner end face at the large end of said conical portion having an annular cavity surrounding and concentric with a central passage through the axis of said sealing member; a rigid inner plate contacting said inner end face of said sealing member having a diameter slightly greater than the outer diameter of said annular cavity therein but less than said greater diameter of said conical surface so that a small conical portion of said second portion of said sealing member extends radially outwardly beyond the periphery of said inner plate; a rigid outer plate adjacent to and having a diameter greater than said cylindrical portion of said sealing member and large enough to abut against the end face of the pipe; and means attached to said inner plate and extending through said sealing member and said outer plate for drawing said plates together so as to cause said conical and cylindrical surfaces to distend and form a radially outwardly extending surface having a diameter greater than the normal diameter of said sealing member which will engage and form a fluid tight seal against the inner wall of the pipe within which the assembly is installed.
Claim 2
Dependent Claim
262 words
A plug assembly for sealing the open end of a pipe having an annular end face, comprising: a circular sealing member of elastomeric material having a first portion with a cylindrical surface and an integral second portion with a continuous conical surface that flares outwardly from said cylindrical surface of said first portion to a greater diameter at the innermost end of said second portion, a transverse inner end face at the large end of said conical portion having an annular cavity surrounding and concentric with a central passage through the axis of said sealing member; a rigid inner plate contacting said inner end face of said sealing member having a diameter slightly greater than the outer diameter of said annular cavity therein but less than said greater diameter of said conical surface so that a small conical portion of said second portion of said sealing member extends radially outwardly beyond the periphery of said inner plate; a rigid outer plate adjacent to and having a diameter greater than said cylindrical portion of said sealing member and large enough to abut against the end face of the pipe; and means attached to said inner plate and extending through said sealing member and said outer plate for drawing said plates together so as to cause said conical and cylindrical surfaces to distend and form a radially outwardly extending surface having a diameter greater than the normal diameter of said sealing member which will engage and form a fluid tight seal against the inner wall of the pipe within which the assembly is installed.
Claim 3
Dependent Claim
48 words
The plug assembly as described in claim 1 wherein said means for drawing said plates together comprises a carriage bolt having a head end seated in said inner plate and a threaded end that extends axially through said outer plate, and a take-up nut on said threaded end.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |