US3887992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing a socket joint between a pair of lengths of thermo-plastic pipe
Assignee: Rieber and Son Plastic Industri AS
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Filing: 1974-03-04
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Granted: 1975-06-10
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Expires: 1994-03-04
Abstract
Abstract A process for producing a socket joint to include a radially expanded shape- and dimensionally stable, internally calibrated reinforced socket end on a closed profile such as an end section of a length of thermoplastic pipe. Internal mould means are pushed into the profile end while the latter is in a heated condition and during the pushing-in operation a radially expanded end socket portion is directly formed making a tightly seated permanent connection with the mould means which is left inside the profile end after forming the latter to provide a nondisplaceable shape-retaining inner reinforcement for use in socket joint by snugly telescoping thereinto an unexpanded end of a second length of the pipe whereby the parts of such joint can be readily assembled and disassembled or adhered together.
Inventors
- 👤 Gunnar Parmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:07
CPC Classifications
B; B29; B29C; B29C57/00; B29C57/02; B29C57/025; B29C65/00; B29C65/66; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/12; B29C66/122; B29C66/1222; B29C66/1226; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5221; B29C66/5229; B29C66/52291; B29C66/52292; B29C66/52296; B29C66/53; B29C66/534; B29C66/5344; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; F; F16; F16L; F16L47/00; F16L47/06; F16L47/08; B29C66/71; B29C66/72; B29C66/721; B29C66/7212; B29C66/7394; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/4987
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
201 words
A process for producing a socket joint between a pair of lengths of thermoplastic pipe, comprising providing an internally calibrated pipe end receptive socket in one end of one of said pipe lengths by telescopically pushing axially into the core of said pipe end while the latter is in a heated elasticallydeformable condition a one-piece and annularly continuous sleeve mould having a through bore with an annular gasket ring-carrying groove therein and an outwardly tapered leading end insertable in said pipe bore and being of greater outer transverse dimensions than the diameter of said pipe bore receptively to expand and shape this pipe end progressively in conformity to the exterior contour of said sleeve mould, leaving said sleeve mould telescoped within said expanded pipe end to serve as a nondisplaceable and permanent internal reinforcing member therefor with the bore of said sleeve mould having at least an annular section into which one end of the other of said pipe lengths can be snugly fitted, providing a gasket ring in said ring-carrying groove, and telescoping said end of the other of said pipe lengths into said annular section of said sleeve mould bore with a snug fit thereby providing said socket joint.
Claim 2
Dependent Claim
201 words
A process for producing a socket joint between a pair of lengths of thermoplastic pipe, comprising providing an internally calibrated pipe end receptive socket in one end of one of said pipe lengths by telescopically pushing axially into the core of said pipe end while the latter is in a heated elasticallydeformable condition a one-piece and annularly continuous sleeve mould having a through bore with an annular gasket ring-carrying groove therein and an outwardly tapered leading end insertable in said pipe bore and being of greater outer transverse dimensions than the diameter of said pipe bore receptively to expand and shape this pipe end progressively in conformity to the exterior contour of said sleeve mould, leaving said sleeve mould telescoped within said expanded pipe end to serve as a nondisplaceable and permanent internal reinforcing member therefor with the bore of said sleeve mould having at least an annular section into which one end of the other of said pipe lengths can be snugly fitted, providing a gasket ring in said ring-carrying groove, and telescoping said end of the other of said pipe lengths into said annular section of said sleeve mould bore with a snug fit thereby providing said socket joint.
Claim 3
Dependent Claim
59 words
The process accordiNg to claim 1, which comprises subjecting the heated end of said first pipe to step-wise radial expansion progressively by the exterior contour of said sleeve mould, as the latter is advanced into said pipe end bore, with this step-wise expansion being effected by longitudinally spaced apart inclined sloping annular surface formations in said sleeve mould contour.
Claim 4
Dependent Claim
85 words
The process according to claim 1, further comprising forming by localized radial expansion of an annular groove within the bore of said heated pipe end by an annular spherical rib provided in the exterior contour of said sleeve mould with these rib and groove structures interfitting, said annular rib being located radially outward of said annular gasket ring-carrying groove in the annular bore section of said sleeve mould into which the end of the other pipe section is snugly fitted in forming said socket joint.
References Cited (Backward Citations)
US3265410A
Cited
US3520047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |