Source: http://www.google.com/patents/US4441743?dq=7,177,838
Timestamp: 2014-12-26 05:17:20
Document Index: 693670876

Matched Legal Cases: ['art 1', 'art 4', 'art 1', 'art 1', 'art 1', 'art 4', 'art 1', 'art 1']

Patent US4441743 - Adhesively joined pipe connection - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn adhesively joined pipe connection comprises a male pipe part and a female pipe part of fiber reinforced plastics, both being provided with a foam plastic insulating layer. The foam plastic layer extends to the front end of the receiving portion of the female pipe part, a heating resistance foil being...http://www.google.com/patents/US4441743?utm_source=gb-gplus-sharePatent US4441743 - Adhesively joined pipe connectionAdvanced Patent SearchPublication numberUS4441743 APublication typeGrantApplication numberUS 06/301,643Publication dateApr 10, 1984Filing dateSep 14, 1981Priority dateSep 15, 1980Fee statusLapsedAlso published asCA1179701A1, DE3165242D1, EP0048065A1, EP0048065B1Publication number06301643, 301643, US 4441743 A, US 4441743A, US-A-4441743, US4441743 A, US4441743AInventorsJohannes F. SteenbergenOriginal AssigneeWavin B.V.Export CitationBiBTeX, EndNote, RefManPatent Citations (12), Referenced by (28), Classifications (24), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetAdhesively joined pipe connectionUS 4441743 AAbstract An adhesively joined pipe connection comprises a male pipe part and a female pipe part of fiber reinforced plastics, both being provided with a foam plastic insulating layer. The foam plastic layer extends to the front end of the receiving portion of the female pipe part, a heating resistance foil being fixed to the outer side of said receiving portion by means of an adhesive. A sealing sleeve engages sealingly the outer side of tubular casings of the foam plastic layers upon the female and male pipe parts. Connecting wires connected with heating foil extend through the foam plastic layer.
A female pipe part of fiber reinforced plastics provided with a foam plastic layer is extending to the free end of a receiving portion and a heating resistance foil fixed to the outer side of said receiving portion. Wires connected to the resistance foil extend through the foam plastic layer.
What is claimed is: 1. A plastic pipe connection, comprising a female pipe part and male pipe part, of fibre reinforced thermosetting plastics, secured together by means of a thermosetting adhesive, at least said female part (4) having a thermally insulating foam plastic layer (2) on its male-part receiving portion (5), characterized in that an electrically heatable foil element (8) covered by the insulating layer (2) is provided on the outer wall surface of the receiving portion (5).
In order to join fiber reinforced, and more particularly glass fiber reinforced, plastic pipes, use is made in the prior art particularly of adhesively joined pipe connections, an adhesive being provided between the inside of the female pipe part and the outside of the male pipe part to provide a good sealing connection. A drawback is that the adhesive used sets slowly at normal temperatures, so that a very long time is necessary before the adhered pipe connection can be subjected to the influence of the fluids conveyed through these pipes.
Another drawback is that the quality of the adhesive joint in pipe connections adhesively joined in this way, frequently leaves much to be desired, when normal ambient temperatures are used, so that leakages may occur in the course of time. When pipe parts of this kind are used particularly for conveying fluids at higher temperature, e.g. fluids used for heating purposes, this is a great disadvantage.
When female and male pipe parts are used which are provided with a thermally insulating layer to their ends, end portions of the thermally insulating layer upon the outer side of the female pipe part must necessarily be removed in order to install a heating element around the receiving part of the female pipe part in order to heat the thermosetting adhesive, or else the receiving part of the female pipe part must be made without a thermally insulating layer in the actual production process. Apart from the associated expenses, this is very disadvantageous, since after the adhesively joined pipe connection has been made the space between the insulating layer on the female pipe part and on the male pipe part has to be filled by foaming a foamable plastic composition, and this entails laborious and labor-intensive operations. In addition, a heating element continually has to be installed and then removed again.
SUMMARY OF THE INVENTION It is a primary object of the present invention to provide an adhesively joined pipe connection of the above type without these drawbacks and in which, after the adhesively joined pipe connection has been made, only small spaces need be filled with foam which operation can even be omitted when a plastic sleeve is fitted on the outer side of a covering of the thermally insulating layer around the whole at the site of the adhesively joined pipe connection.
The great advantage of these measures is that after the adhesive has been applied and the male pipe part has been pushed in, the required heat can be supplied to the thermosetting adhesive by means of the heating element without any adverse effect on the thermally insulating layer.
To enable the heating element to be readily heated, connecting wires connected to the heating element project outwardly from the thermally insulating layer. The heating element can in this way be heated by means of an electrical source and the thermosetting adhesive can be rapidly set to that a very good adhesively joined connection is obtained rapidly and very simply in this manner.
The present invention is also embodied in a female pipe part suitable for an adhesively joined pipe connection, using a thermosetting adhesive, in which the female pipe part bears a thermally insulating layer at least on its receiving portion a heating element, preferably a resistance foil element, also being provided on said receiving portion.
DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal section through a pipe connection according to the present invention;
DESCRIPTION OF PREFERRED EMBODIMENTS Referring now to FIG. 1, a male pipe part 1 is shown of glass fiber reinforced thermosetting resin, e.g. an epoxy or polyester resin. The male pipe part is provided with a thermally insulating layer 2 of organic foam material in the form of a polyurethane foam material.
The figure further shows a female pipe part 4 (e.g. a band), also of glass fiber reinforced thermosetting resin, such as polyester or epoxy resin, with a receiving end portion 5. A layer 7 of thermosetting adhesive is provided between the inner wall of the receiving portion 5 and the outer side of the male pipe part 1, said layer having been set by heating.
The thermally insulating plastic foam layer on the male pipe part 1 terminates at some distance from the head end 10 of the male pipe part 1, in the finished adhesively joined pipe connection, however, the front surface 11 of the plastic foam insulating layer 2 on the female pipe part 4 may practically adjoin the front end 12 of the plastic foam layer 2 on the male pipe part 1.
Although filling this space 16 with foam can be omitted it is advisable to fill this space with a foam plastic material for the purposes of flexural rigidity. If these spaces are not filled with foam they may form pivots in the complete pipeline, which may be very disadvantageous.
Referring now to FIG. 3 the outer side of a female pipe part in the form of a T-piece 17 is provided with a thermally insulating layer 2. Layer 2 consists of polyurethane foam, and the same holds for the thermally insulating layer 2 on the male pipe part 1.
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Raychem S.A.Joining insulated elongate conduit membersUS5163469 *Sep 3, 1991Nov 17, 1992Truebro PartnershipUnitary article comprising protective system componentsUS5184850 *Oct 25, 1991Feb 9, 1993Georg Fischer AgMethod of connecting pipes of plastics material of a double pipe system and a pipe connection made by the methodUS5186502 *Dec 11, 1990Feb 16, 1993Fibercast CompanyDouble-containment pipe fittings and systemUS5259410 *Sep 14, 1992Nov 9, 1993Truebro Inc.System for P-trap protectionUS5303730 *Apr 8, 1993Apr 19, 1994Truebro, Inc.P-trap protecting systemUS5360031 *Feb 22, 1994Nov 1, 1994Truebro, Inc.P-trap insulation and articleUS5419364 *Feb 22, 1994May 30, 1995Truebro, Inc.Angle valve insulationUS5524669 *Apr 21, 1995Jun 11, 1996Truebro, Inc.Of a sink or the likeUS5540255 *Apr 21, 1995Jul 30, 1996Truebro, Inc.Thermal insulation for P-trap pipingUS5901739 *Nov 26, 1996May 11, 1999Helmsderfer; John A.Cover assembly with integral securing apparatus for covering undersink pipingUS5904175 *May 1, 1997May 18, 1999Mcguire Manufacturing Co., Inc.Insulative cover piece for a trap pipe of a p-trap drain pipeUS5913325 *Jul 2, 1998Jun 22, 1999Helmsderfer; John A.Method for insulating a p-trap drain piping assemblyUS5915413 *Sep 24, 1997Jun 29, 1999Helmsderfer; John A.Cover assembly with integral measurement indicia for covering undersink pipingUS5934316 *Sep 29, 1997Aug 10, 1999Helmsderfer; John A.Cover assembly and method for covering undersink pipingUS5960820 *Sep 19, 1997Oct 5, 1999Helmsderfer; John A.Cover assembly having rapid installation features for covering undersink pipingUS6012480 *Jul 2, 1998Jan 11, 2000Helmsderfer; John A.Cover assembly for covering undersink piping utilizing sliding cover piecesUS7166177Aug 21, 2003Jan 23, 2007Ameron International CorporationMethod for forming double containment pipeline sectionsUS8156700 *Apr 29, 2010Apr 17, 2012Terry UmlorContinuous heat welded flexible PVC membrane with an interlocking vapor barrier systemUS8800213 *Apr 11, 2012Aug 12, 2014Terry UmlorContinuous heat welded flexible PVC membrane with an interlocking vapor barrier system and including sensor detection features associated with each of a plurality of overlapping membrane sectionsUS20120192511 *Apr 11, 2012Aug 2, 2012Terry UmlorContinuous heat welded flexible pvc membrane with an interlocking vapor barrier system and including sensor detection features associated with each of a plurality of overlapping membrane sectionsWO2001013026A1 *Aug 10, 2000Feb 22, 2001Bouygues OffshoreMethod for producing on a barge or work site an assembly of two metal tubes of a sea line and insulating the assembly zone and adapted tubes therefor* Cited by examinerClassifications U.S. Classification285/21.2, 285/915, 285/45, 285/47International ClassificationF16L13/14, B29C65/34, F16L47/02, F16L59/20Cooperative ClassificationB29C65/3476, Y10S285/915, B29C65/3452, B29L2023/225, F16L59/20, B29L2031/246, B29C66/1122, B29L2031/243, B29C65/3444, B29C66/52231, B29C66/52241, B29C66/52292European ClassificationB29C66/1122, B29C65/34, B29C66/5221, F16L59/20Legal EventsDateCodeEventDescriptionJun 16, 1992FPExpired due to failure to pay maintenance feeEffective date: 19920412Apr 12, 1992LAPSLapse for failure to pay maintenance feesNov 12, 1991REMIMaintenance fee reminder mailedOct 2, 1987FPAYFee paymentYear of fee payment: 4Sep 14, 1981ASAssignmentOwner name: WAVIN B.V., 251 HANDELLAAN, 8031 EM ZWOLLE, THE NEFree format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:STEENBERGEN, JOHANNES F.;REEL/FRAME:003923/0236Effective date: 19810903RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google