US3929958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing radially-expanded socket ends on thermoplastic pipe lengths
Assignee: Rieber and Son Plastic Industri AS
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Filing: 1975-01-23
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Granted: 1975-12-30
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Expires: 1995-01-23
Abstract
Abstract Process for producing radially expanded socket ends on pipe lengths of thermoplastic material. An appropriately heated pipe end is fashioned over a shape-conferring means comprising a substantially cylindrical drift, a mould element for forming an internal, radially expanded peripheral groove in said end and support means mounted on said drift and axially displaceable relative thereto. The support means is maintained in a desired position with a view to locating the mould element in the face of a pushing-on force from the pipe and as drift, mould element and support means are caused to be led in succession axially into the hot pipe end. Subsequent to the desired insertion of the mould element in the hot pipe end, the support means is axially displaced relative to the drift outwardly from the pipe end, thereby enabling elastic forces in the radially expanded pipe end to be drawn radially inwards against the drift and said end to be fashioned by the mould element into the required form. The mould element and fashioned pipe end are then subjected to cooling prior to their joint removal from the drift.
Inventors
- 👤 Gunnar Parmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:46
CPC Classifications
F; F16; F16L; F16L47/00; F16L47/06; F16L47/08; B; B29; B29C; B29C57/00; B29C57/02; B29C57/025
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
237 words
A PROCESS FOR PRODUCING A RADIALLY EXPANDED SOCKET END WITH A RADIALLY EXPANDED GROOVE FOR AN INNER SEALING ELEMENT ON A PIPE LENGTH OF THERMOPLASTIC MATERIAL COMPRISING THE STEPS OF HEATING HONE END OF A PIPE LENGTH, POSITIONING A CIRCUMFERENTIALLY SPLIT MOULD ELEMENT OF RIGID ELASTIC MATERIAL HAVING A WEDGE SHAPED SIDE FACE PORTION ON A SUBSTANTIALLY CYLINDRICAL FACE OF A DIRT, SAID FACE HAVING LARGER DIAMETER THAN THE OUTSIDE DIAMETER OF THE PIPE LENGTH, POSITIONING A REMOVABLE SUPPORT MEMBER ON SAID DRIFT TO AXIALLY SUPPE ORT THE MOULD ELEMENT ON SAID DRIFT, SAID SUPPORT MEMBER HAVING AN ABUTING SURFACE COOPERATING WITH SAID WEDGE SHAPED SIDE FACE PORTION TO FORCE SAID MOULD ELEMENT INTO ABUTMENT WITH SAID DIRT DRIFT SURFACE DURING AN INFLUENCE OF A PUSHING-ON FORCE EXERTED BY THE HOT PIPE END, MOVING THE HEATED END OF TH PIPE LENGTH RELATIVELY OVER THE MOULD ELEMENT, THE SUPPORT MEMBER AND THE DRIFT TO RADIALLY EXPAND THE HEATED END AND TO LOCATE THE HEATED END IN A FINAL POSITION AXIALLY ON THE DRIFT, SUBSEQUENTLY REMOVING AND THE MEMBER FROM ADJACENT THE MOULD ELEMENT AND THE HEATED END WHILE SAID HEATED END REMAINS AXIALLY UNDISPLACEABLE IN SAID FINAL POSITION CONTRACTING THE UNSUPPOTR RTED END OF THE HEATED PIPE RADIALY INWARDLY AGAINST SAID CYLINDRICAL DRIFT FACE, AND SUBSEQUENTLY COOLING DOWN SUCH FASHIONED PIPE END DURING SUPPORT THEREOF IN SAID FINAL POSITION BY MEANS OF SAID MOULD ELEMENT AND SAID DRIFT.
Claim 2
Dependent Claim
237 words
A PROCESS FOR PRODUCING A RADIALLY EXPANDED SOCKET END WITH A RADIALLY EXPANDED GROOVE FOR AN INNER SEALING ELEMENT ON A PIPE LENGTH OF THERMOPLASTIC MATERIAL COMPRISING THE STEPS OF HEATING HONE END OF A PIPE LENGTH, POSITIONING A CIRCUMFERENTIALLY SPLIT MOULD ELEMENT OF RIGID ELASTIC MATERIAL HAVING A WEDGE SHAPED SIDE FACE PORTION ON A SUBSTANTIALLY CYLINDRICAL FACE OF A DIRT, SAID FACE HAVING LARGER DIAMETER THAN THE OUTSIDE DIAMETER OF THE PIPE LENGTH, POSITIONING A REMOVABLE SUPPORT MEMBER ON SAID DRIFT TO AXIALLY SUPPE ORT THE MOULD ELEMENT ON SAID DRIFT, SAID SUPPORT MEMBER HAVING AN ABUTING SURFACE COOPERATING WITH SAID WEDGE SHAPED SIDE FACE PORTION TO FORCE SAID MOULD ELEMENT INTO ABUTMENT WITH SAID DIRT DRIFT SURFACE DURING AN INFLUENCE OF A PUSHING-ON FORCE EXERTED BY THE HOT PIPE END, MOVING THE HEATED END OF TH PIPE LENGTH RELATIVELY OVER THE MOULD ELEMENT, THE SUPPORT MEMBER AND THE DRIFT TO RADIALLY EXPAND THE HEATED END AND TO LOCATE THE HEATED END IN A FINAL POSITION AXIALLY ON THE DRIFT, SUBSEQUENTLY REMOVING AND THE MEMBER FROM ADJACENT THE MOULD ELEMENT AND THE HEATED END WHILE SAID HEATED END REMAINS AXIALLY UNDISPLACEABLE IN SAID FINAL POSITION CONTRACTING THE UNSUPPOTR RTED END OF THE HEATED PIPE RADIALY INWARDLY AGAINST SAID CYLINDRICAL DRIFT FACE, AND SUBSEQUENTLY COOLING DOWN SUCH FASHIONED PIPE END DURING SUPPORT THEREOF IN SAID FINAL POSITION BY MEANS OF SAID MOULD ELEMENT AND SAID DRIFT.
Claim 3
Dependent Claim
228 words
A process for producing a radially expanded socket end with a radially expanded groove for an inner sealing element on a pipe length of thermoplastic material comprising the steps of heating one end of a pipe length, positioning a mould element with a wedge shaped side face portion on a substantially cylindridal face of a drift, said face having larger diameter than the outside diameter of the pipe length, positioning a removable support member on said drift to axially support the mould element on said drift, said support member having an abutting surface cooperating with said wedge shaped side face portion to force said mould element into abutment with said drift surface during an influence of a pushing-on force exerted by the hot pipe end, moving the heated end of the pipe length relatively over the mould element, the support member and the drift to radially expand the heated end and to locate the heated end in a final position axially of the drift, subsequently removing the support member from adjacent the mould element and the heated end which said heated end remains axially undisplaceable in said final position, contracting the unsupported end of the heated pipe radially inwardly against said cylindrical drift face, and subsequently cooling down such fashioned pipe end during support thereof in said final position by means of said mould element and said drift.
Claim 4
Dependent Claim
228 words
A process for producing a radially expanded socket end with a radially expanded groove for an inner sealing element on a pipe length of thermoplastic material comprising the steps of heating one end of a pipe length, positioning a mould element with a wedge shaped side face portion on a substantially cylindridal face of a drift, said face having larger diameter than the outside diameter of the pipe length, positioning a removable support member on said drift to axially support the mould element on said drift, said support member having an abutting surface cooperating with said wedge shaped side face portion to force said mould element into abutment with said drift surface during an influence of a pushing-on force exerted by the hot pipe end, moving the heated end of the pipe length relatively over the mould element, the support member and the drift to radially expand the heated end and to locate the heated end in a final position axially of the drift, subsequently removing the support member from adjacent the mould element and the heated end which said heated end remains axially undisplaceable in said final position, contracting the unsupported end of the heated pipe radially inwardly against said cylindrical drift face, and subsequently cooling down such fashioned pipe end during support thereof in said final position by means of said mould element and said drift.
Claim 5
Dependent Claim
197 words
A process for producing a radially expanded socket end with a radially expanded groove for an inner sealing element on a pipe length of thermoplastic material comprising the steps of heating one end of a pipe length, positioning a mould element on a substantially cylindrical face of a drift, said face having larger diameter than the outside diameter of the pipe length, positioning a removable support member on said drift to axially support the mould element on said drift, moving the heated end of the pipe length relatively over the mould element, the support member and the drift to radially expand the heated end and to locate the heated end in a final position axially of the drift, heating the support member to heat the pipe end during movement over the support member, subsequently removing the support member from adjacent the mould element and the heated end while said heated end remains axially undisplaceable in said final position, contracting the unsupported end of the heated pipe radially inwardly against said cylindrical drift face, and subsequently cooling down such fashioned pipe end during support thereof in said final position by means of said mould element and said drift.
Claim 6
Dependent Claim
197 words
A process for producing a radially expanded socket end with a radially expanded groove for an inner sealing element on a pipe length of thermoplastic material comprising the steps of heating one end of a pipe length, positioning a mould element on a substantially cylindrical face of a drift, said face having larger diameter than the outside diameter of the pipe length, positioning a removable support member on said drift to axially support the mould element on said drift, moving the heated end of the pipe length relatively over the mould element, the support member and the drift to radially expand the heated end and to locate the heated end in a final position axially of the drift, heating the support member to heat the pipe end during movement over the support member, subsequently removing the support member from adjacent the mould element and the heated end while said heated end remains axially undisplaceable in said final position, contracting the unsupported end of the heated pipe radially inwardly against said cylindrical drift face, and subsequently cooling down such fashioned pipe end during support thereof in said final position by means of said mould element and said drift.
Claim 7
Dependent Claim
62 words
A process according to claim 3 which comprises initially using the support means to maintain the mould element in non-displaceable abutting relationship therewith against the pushing-on force exerted by the hot pipe end, said support means also serving as A guide for said end enabling a predetermined length of thermoplastic material to pass over said mould element and outside the support means.
Claim 8
Dependent Claim
28 words
A process according to claim 4 which comprises using the support means to push the radially expanded socket end from the drift after cooling the fashioned pipe end.
Claim 9
Dependent Claim
39 words
A process as set forth in claim 3 wherein said step of contracting the free end of the heated pipe includes the creation of a lower air pressure radially within the unsupported end than radially without said unsupported end.
Claim 10
Dependent Claim
27 words
A process according to claim 3 which comprises using said mould element as a sole mould element as well as a sealing element in the final product.
Claim 11
Dependent Claim
156 words
A process for producing a radially expanded socket end on a pipe length of thermoplastic material comprising the steps of heating one end of the pipe length; positioning a mould element of larger outside diameter than the inner diameter of the pipe length on a cylindrical surface of a drift adjacent the heated end of the pipe length; positioning a support member axially adjacent to the mould member to axially maintain the mould member in a final position on the drift; moving the heated end of the pipe length over the mould element and support member to radially expand the heated end; heating the support member to heat the pipe end during movement over the support member; subsequently removing the support member from adjacent the mould element; and contracting the free end of the heated pipe radially inwardly about the mould element and onto the cylindrical surface of the drift during removal of the support member.
Claim 12
Dependent Claim
156 words
A process for producing a radially expanded socket end on a pipe length of thermoplastic material comprising the steps of heating one end of the pipe length; positioning a mould element of larger outside diameter than the inner diameter of the pipe length on a cylindrical surface of a drift adjacent the heated end of the pipe length; positioning a support member axially adjacent to the mould member to axially maintain the mould member in a final position on the drift; moving the heated end of the pipe length over the mould element and support member to radially expand the heated end; heating the support member to heat the pipe end during movement over the support member; subsequently removing the support member from adjacent the mould element; and contracting the free end of the heated pipe radially inwardly about the mould element and onto the cylindrical surface of the drift during removal of the support member.
Claim 13
Dependent Claim
216 words
A process for producing a radially expanded socket end with a radially expanded groove for an inner sealing element on a pipe length of thermoplastic material comprising the steps of: heating one end of a pipe length, positioning a mould element on a substantially cylindrical face of a drift, said face having larger diameter than the outside diameter of the pipe length, positioning a support member on said drift face adjacent said mould element, moving the heated end of the pipe length relatively over said drift face to radially expand the heated end and to locate the heated end in a final position axially on the drift, moving the support member and the mould element which is supported axially on said drift by said support member relatively into the heated end to further radially expand said heated end, heating the support member to heat the pipe end during movement over the support member, subsequently removing the support member from adjacent the mould element whereas said heated end remains axially undisplaceable in said final position on the drift, contracting the unsupported end of the heated pipe radially inwardly against said cylindrical drift face, and subsequently cooling down such fashioned pipe end during support thereof in said final position by means of said mould element and said drift.
Claim 14
Dependent Claim
216 words
A process for producing a radially expanded socket end with a radially expanded groove for an inner sealing element on a pipe length of thermoplastic material comprising the steps of: heating one end of a pipe length, positioning a mould element on a substantially cylindrical face of a drift, said face having larger diameter than the outside diameter of the pipe length, positioning a support member on said drift face adjacent said mould element, moving the heated end of the pipe length relatively over said drift face to radially expand the heated end and to locate the heated end in a final position axially on the drift, moving the support member and the mould element which is supported axially on said drift by said support member relatively into the heated end to further radially expand said heated end, heating the support member to heat the pipe end during movement over the support member, subsequently removing the support member from adjacent the mould element whereas said heated end remains axially undisplaceable in said final position on the drift, contracting the unsupported end of the heated pipe radially inwardly against said cylindrical drift face, and subsequently cooling down such fashioned pipe end during support thereof in said final position by means of said mould element and said drift.
References Cited (Backward Citations)
US3520047A
Cited
US3728065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |