US3886977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plug for pipes under pressure
Assignee: Individual
•
Filing: 1973-07-27
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Granted: 1975-06-03
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Expires: 1993-07-27
Abstract
Abstract Plug for use with a machine for perforating pipes, and making it possible to carry out maintenance operations and alterations on the valves and ends of pipes under pressure which plug comprises two end plates which are coaxial and each of which comprises a frusto-conical surface facing the frusto-conical surface of the other, said surfaces having the same taper, a plurality of gripping jaws in the form of circumferentially spaced sectors of a ring occupying the space between the frusto-conical surfaces of the two end plates, a retaining spring for holding the sectors in position, a sealing plate having an annular sealing member attached to one of the end plates, and means for producing relative movement between the two end plates. The principal applications of the plug are for the replacement of a valve, the repair of a pressure valve, and the extension of a pipe which is in service without requiring the previous mounting of a special flange.
Inventors
- 👤 Gerard Dorgebray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:30
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/10; F16L55/12; F16L55/128; F16L55/136; F16K; F16K27/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
213 words
Plug for pipe under pressure which comprises two coaxial end plates which are mounted for relative translation, each having a peripheral frusto-conical surface facing the other and having the same taper, a plurality of jaws consisting of a number of circumferentially spaced sectors of a ring having a cylindrical circumferential surface, the diameter of which surface approximates the inner diameter of the pipe to be plugged, said sectors occupying the space between the two frusto-conical surfaces of the end plates, means for retaining said sectors in said space, sealing means mounted on one of the end plates and constituting with said one end plate a closure completely blocking said pipe, a threaded spigot fixed to one of the plates and passing through the other, the end of said spigot being axially tapped to receive a threaded operating rod, a nut screwed onto the outside of said spigot and overlapping said other end plate, and at least one elongated connecting means extending between said coaxial end plates, parallel to the axis of said end plates and preventing relative rotation of said end plates, one end of each connecting means being longitudinally slidable within one of said end plates between fixed abutments which limit the axial movement of said end plates relative to each other.
Claim 2
Dependent Claim
213 words
Plug for pipe under pressure which comprises two coaxial end plates which are mounted for relative translation, each having a peripheral frusto-conical surface facing the other and having the same taper, a plurality of jaws consisting of a number of circumferentially spaced sectors of a ring having a cylindrical circumferential surface, the diameter of which surface approximates the inner diameter of the pipe to be plugged, said sectors occupying the space between the two frusto-conical surfaces of the end plates, means for retaining said sectors in said space, sealing means mounted on one of the end plates and constituting with said one end plate a closure completely blocking said pipe, a threaded spigot fixed to one of the plates and passing through the other, the end of said spigot being axially tapped to receive a threaded operating rod, a nut screwed onto the outside of said spigot and overlapping said other end plate, and at least one elongated connecting means extending between said coaxial end plates, parallel to the axis of said end plates and preventing relative rotation of said end plates, one end of each connecting means being longitudinally slidable within one of said end plates between fixed abutments which limit the axial movement of said end plates relative to each other.
Claim 3
Dependent Claim
213 words
Plug for pipe under pressure which comprises two coaxial end plates which are mounted for relative translation, each having a peripheral frusto-conical surface facing the other and having the same taper, a plurality of jaws consisting of a number of circumferentially spaced sectors of a ring having a cylindrical circumferential surface, the diameter of which surface approximates the inner diameter of the pipe to be plugged, said sectors occupying the space between the two frusto-conical surfaces of the end plates, means for retaining said sectors in said space, sealing means mounted on one of the end plates and constituting with said one end plate a closure completely blocking said pipe, a threaded spigot fixed to one of the plates and passing through the other, the end of said spigot being axially tapped to receive a threaded operating rod, a nut screwed onto the outside of said spigot and overlapping said other end plate, and at least one elongated connecting means extending between said coaxial end plates, parallel to the axis of said end plates and preventing relative rotation of said end plates, one end of each connecting means being longitudinally slidable within one of said end plates between fixed abutments which limit the axial movement of said end plates relative to each other.
Claim 4
Dependent Claim
213 words
Plug for pipe under pressure which comprises two coaxial end plates which are mounted for relative translation, each having a peripheral frusto-conical surface facing the other and having the same taper, a plurality of jaws consisting of a number of circumferentially spaced sectors of a ring having a cylindrical circumferential surface, the diameter of which surface approximates the inner diameter of the pipe to be plugged, said sectors occupying the space between the two frusto-conical surfaces of the end plates, means for retaining said sectors in said space, sealing means mounted on one of the end plates and constituting with said one end plate a closure completely blocking said pipe, a threaded spigot fixed to one of the plates and passing through the other, the end of said spigot being axially tapped to receive a threaded operating rod, a nut screwed onto the outside of said spigot and overlapping said other end plate, and at least one elongated connecting means extending between said coaxial end plates, parallel to the axis of said end plates and preventing relative rotation of said end plates, one end of each connecting means being longitudinally slidable within one of said end plates between fixed abutments which limit the axial movement of said end plates relative to each other.
Claim 5
Dependent Claim
17 words
Plug as claimed in claim 1 comprising rotatable bearings mounted between the end plates and the sectors.
Claim 6
Dependent Claim
39 words
Plug as claimed in claim 1 comprising a removable disc mounted on the end plate carrying said spigot, and in which said sealing means comprises an annular sealing ring mounted in a groove in the periphery of said disc.
Claim 7
Dependent Claim
73 words
Plug as claimed in claim 1 in which the sealing means comprises a compressible, deformable sealing member mounted on one of the two end plates, said one end plate being made in two parts between which said sealing member is gripped, one of said parts carrying said threaded spigot and the other being annular and pierced by said threaded spigot and having a frusto-conical surface against which the sectors of the jaw bear.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |