US3840053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inside repair clamp for low pressure piping
Assignee: Dresser Industries Inc
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Filing: 1973-02-05
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Granted: 1974-10-08
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Expires: 1993-02-05
Abstract
Abstract A clamp for the repair of pipe leaks in low pressure piping. An annular gasket seal is supported against the internal pipe surface axially spanning the area of leak. An annular backing ring extending widthwise as well as radially along the side walls of the gasket axially confined the gasket in a predetermined circumferential compression against the pipe wall.
Inventors
- 👤 W Sluga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:22
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/162; F16L55/163
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
195 words
In an inside clamp for repair of a leak gap in a piping system including an annular flexible gasket having a puckered radially outer surface for engagement against an inner pipe wall spanning a leak gap thereat; and an annular backing member circumferentially extending about the radially inner surface of said gasket in circumferential compressive relation thereagainst for effecting a predetermined sealing pressure between the engaging surfaces of said gasket and pipe wall, the improvement in which the axial ends of said gasket include a relatively thin radial section of substantially unpuckered contour on its radially outer surface and said backing member in cross-section includes a portion that generally spans the width of said inner gasket surface to axially confine the width of said outer surface for uniformly maintaining the sealing prEssure thereof and including a leg extending integrally from each axial end of the gasket spanning portion radially outward in axially confining relation with the side walls of said gasket axially inward of the gasket end thereof and adapted to radially engage the axial gasket end for affecting a forced sealing engagement between the engaging surfaces of the axial gasket end and pipe wall.
Claim 2
Dependent Claim
195 words
In an inside clamp for repair of a leak gap in a piping system including an annular flexible gasket having a puckered radially outer surface for engagement against an inner pipe wall spanning a leak gap thereat; and an annular backing member circumferentially extending about the radially inner surface of said gasket in circumferential compressive relation thereagainst for effecting a predetermined sealing pressure between the engaging surfaces of said gasket and pipe wall, the improvement in which the axial ends of said gasket include a relatively thin radial section of substantially unpuckered contour on its radially outer surface and said backing member in cross-section includes a portion that generally spans the width of said inner gasket surface to axially confine the width of said outer surface for uniformly maintaining the sealing prEssure thereof and including a leg extending integrally from each axial end of the gasket spanning portion radially outward in axially confining relation with the side walls of said gasket axially inward of the gasket end thereof and adapted to radially engage the axial gasket end for affecting a forced sealing engagement between the engaging surfaces of the axial gasket end and pipe wall.
Claim 3
Dependent Claim
64 words
The improvement according to claim 1 in which said gasket is centrally recessed between spaced ribs on the inner gasket surface to receive said backing member, and said backing member in cross-section extends in closely confining wrap around relation about each of the spaced ribs from said recess in the vicinity of where each leg extends from the respective end of said spanning portion.
Claim 4
Dependent Claim
34 words
The improvement according to claim 2 in which the backing member is circumferentially split in width into contiguous sections along a plane for support substantially radially coextensive with the pipe gap to be repaired.
Claim 5
Dependent Claim
17 words
The improvement according to claim 3 in which each contiguous section is of a more-or-less 5-shaped cross-section.
Claim 6
Dependent Claim
23 words
The improvement according to claim 2 in which said backing member is comprised of a plurality of assembled end-to-end arc on chord segments.
Claim 7
Dependent Claim
33 words
The improvement according to claim 5 in which fillers are contained between at least some of said end-to-end segments to effect a predetermined circumferential compressive relation of the backing member against said gasket.
Claim 8
Dependent Claim
42 words
The improvement according to claim 5 including a splice plate overyling the ends of adjacent segments securing said segments in assembled relation and having circumferentially spaced apertures through which to receive screws for screwed securement to each of the respective adjacent segments.
Claim 9
Dependent Claim
41 words
The improvement according to claim 7 in which at least one of the apertures in said splice plate has a circumferential extent substantially greater than the screw diameter to be received therein permitting circumferentially adjustable setting of a segment relative thereto.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |