US4252349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure plastic pipe coupling
Assignee: HYDRAFLOW A Corp OF
•
Filing: 1979-02-23
•
Granted: 1981-02-24
•
Expires: 1999-02-23
Abstract
Abstract A high pressure plastic pipe coupling in which a formed in situ annular wedge converts axial loads on a flanged ring to compressive hoop stress loads on a reinforced resin pipe.
Inventors
- 👤 George A. Mahoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:53
CPC Classifications
F; F16; F16L; F16L47/00; F16L47/18; F16L47/02; F16L47/14; Y; Y10; Y10S; Y10S285/00; Y10S285/915
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
A coupling member for reinforced resin pipe which is capable of withstanding from about 200 to 500 pounds per square inch comprising: a metallic reinforcing ring means for receiving an axially applied load and converting a substantial component of said load into hoop compressive stress on said pipe, said reinforcing ring means including an axial conical bore having a cone angle of from about three to ten degrees, the diameter of said bore increasing in the direction of said load a length of said pipe having one end received within said bore; and an annular wedging element means for wedging coaction with said reinforcing ring means, said annular wedging element means including a mass of resin cured in situ on the exterior surface of said pipe and bonded therewith, said annular wedging element means being closely conformed to and bonded to said bore, said annular wedging element means being adapted to distribute said compressive hoop stress evenly without excessive localized concentration of forces.
Claim 2
Dependent Claim
163 words
A coupling member for reinforced resin pipe which is capable of withstanding from about 200 to 500 pounds per square inch comprising: a metallic reinforcing ring means for receiving an axially applied load and converting a substantial component of said load into hoop compressive stress on said pipe, said reinforcing ring means including an axial conical bore having a cone angle of from about three to ten degrees, the diameter of said bore increasing in the direction of said load a length of said pipe having one end received within said bore; and an annular wedging element means for wedging coaction with said reinforcing ring means, said annular wedging element means including a mass of resin cured in situ on the exterior surface of said pipe and bonded therewith, said annular wedging element means being closely conformed to and bonded to said bore, said annular wedging element means being adapted to distribute said compressive hoop stress evenly without excessive localized concentration of forces.
Claim 3
Dependent Claim
23 words
A coupling member according to claim 1 wherein said length of reinforced resin pipe is a composite of glass filament and thermoset resin.
Claim 4
Dependent Claim
36 words
A coupling member according to claim 1 wherein an end of said length of reinforced resin pipe which is not received within said bore is tapered to form one part of a bell and spigot joint.
Claim 5
Dependent Claim
25 words
A coupling member according to claim 1, including an O-ring groove in said annular wedging element means, said O-ring groove being spaced from said bore.
References Cited (Backward Citations)
US1876586A
Cited
US1164771A
Cited
US2876154A
Cited
US2962305A
Cited
FR1214555A
Cited
US2998269A
Cited
US3264013A
Cited
US3695644A
Cited
US3776996A
Cited
US3776579A
Cited
US4013309A
Cited
US4035002A
Cited
DE2711699A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |