US3983904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plug assembly for sealing a pipe
Assignee: Individual
•
Filing: 1975-03-13
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Granted: 1976-10-05
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Expires: 1995-03-13
Abstract
Abstract A plug assembly for fluid sealing a pipe includes a cylindrical plug made of pliable material which has a conical bore defining a cylindrical wall of tapering thickness. A threaded bore or stud extends axially of the bore and has a nut rotatable mounted thereon. A spherical or conical drive member carried by the bolt contacts and expands the tapered wall of the plug when the nut is tightered on the bolt. The nut may bear against the drive member or one end of the plug. The bolt may be prevented from rotating when the nut is tightened, by shaping one end of the bolt to engage a wrench, or by locking the other end of the bolt in the plug and providing gripping means on the plug arranged to engage the inside of the pipe.
Inventors
- 👤 Louis R. Laviano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:32
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/10; F16L55/12; F16L55/128; F16L55/136
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A plug assembly for sealing a pipe, comprising: a cylindrical plug insertable axially in a pipe said plug having a conical bore extending from intermediate the ends of said plug to one end of said plug thereby defining a cylindrical wall of tapering thickness which is thinnest at said one end of said plug; a threaded member extending axially through said conical bore; a nut rotatably mounted on said threaded member; means for preventing said threaded member from rotating when said nut is rotated; and a rigid spherically shaped drive means carried by said threaded member and arranged to contact and expand said tapered wall of said plug, when said nut is rotated and moves axially thereby axially moving said drive means whereby the expanded wall seals the inside of said pipe.
Claim 2
Dependent Claim
132 words
A plug assembly for sealing a pipe, comprising: a cylindrical plug insertable axially in a pipe said plug having a conical bore extending from intermediate the ends of said plug to one end of said plug thereby defining a cylindrical wall of tapering thickness which is thinnest at said one end of said plug; a threaded member extending axially through said conical bore; a nut rotatably mounted on said threaded member; means for preventing said threaded member from rotating when said nut is rotated; and a rigid spherically shaped drive means carried by said threaded member and arranged to contact and expand said tapered wall of said plug, when said nut is rotated and moves axially thereby axially moving said drive means whereby the expanded wall seals the inside of said pipe.
Claim 3
Dependent Claim
36 words
A plug assembly as defined in claim 1, wherein said means for preventing said threaded member from rotating when said nut is rotated comprises an end portion of said threaded member shaped for engaging a wrench.
Claim 4
Dependent Claim
38 words
A plug assembly as defined in claim 1, wherein said cylindrical plug is made of a pliable material which retains its expanded form and seals said pipe even though said nut is moved away from said drive means.
Claim 5
Dependent Claim
42 words
A plug assembly as defined in claim 3, wherein said means for preventing said bolt from rotating when said nut is rotated comprises an end portion of said threaded member locked in a section of said plug adjacent to said conical bore.
Claim 6
Dependent Claim
42 words
A plug assembly as defined in claim 3, wherein said means for preventing said threaded member from rotating when said nut is rotated comprises a gripping means on the other end of said plug arranged to engage the inside of said pipe.
Claim 7
Dependent Claim
63 words
A plug assembly as defined in claim 3, wherein said means for preventing said threaded member from rotating when said nut is rotated comprises an end portion of said threaded member locked in a section of said plug adjacent to said conical bore, and having a gripping means on the other end of said plug arranged to engage the inside of said pipe.
Claim 8
Dependent Claim
57 words
A plug assembly as defined in claim 3, wherein said drive means is spherical and disposed adjacent said nut for contact thereby when the said nut is rotated to bear against said drive means and wherein said means for preventing said bolt from rotating comprises an end portion of said threaded member shaped for engaging a wrench.
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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) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |