GB2325636A - Improvements in or relating to pipes - Google Patents
Improvements in or relating to pipes Download PDFInfo
- Publication number
- GB2325636A GB2325636A GB9711184A GB9711184A GB2325636A GB 2325636 A GB2325636 A GB 2325636A GB 9711184 A GB9711184 A GB 9711184A GB 9711184 A GB9711184 A GB 9711184A GB 2325636 A GB2325636 A GB 2325636A
- Authority
- GB
- United Kingdom
- Prior art keywords
- moulding
- pipe
- end region
- elongate
- reaction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14598—Coating tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
- B29C70/76—Moulding on edges or extremities of the preformed part
- B29C70/766—Moulding on edges or extremities of the preformed part on the end part of a tubular article
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Pipe Accessories (AREA)
Abstract
Apparatus 10 for providing a sealing member 12 on a pipe 18 comprises moulding means 20. The moulding means 20 comprises a first moulding member 22 insertable into the pipe at one end region thereof and a second moulding member 24 adapted to be arranged around said one end region of the pipe. The first and second moulding members define a moulding space around said one end region of the pipe. The apparatus 10 further includes means 44 for delivering a curable moulding material into the moulding space 42. An injection moulding technique is used. A sealing member is similarly moulded over the opposite end region 116 of the pipe 18 (see figure 4).
Description
Improvements in or relating to DiDes
This invention relates to pipes1 particularly, but not exclusively waste pipes for use in disposal of waste water from lavatories. This invention also relates to a method for providing a sealing member on a pipe. The invention also relates to apparatus for providing a sealing member on a pipe.
Waste pipes for lavatories are provided with sealing members at their opposite ends. Typically, the sealing members are a push fit onto the pipe after the pipe has been formed. Such sealing members are inadequate, because they tend to leak. Also, present waste pipes require the two pipes to which the waste pipe is to be fitted to be correctly aligned otherwise fitting is difficult.
According to one aspect of this invention there is provided apparatus for providing a sealing member on a pipe, comprising moulding means comprising a first moulding member insertable into the pipe at one end region thereof and a second moulding member adapted to be arranged around said one end region of the pipe to define, with the first moulding member a moulding space around said one end region of the pipe, and means for delivering a curable moulding material to the moulding space.
The moulding means may include an elongate member on which said first moulding member is mounted. The first moulding member may be fixedly mounted on the elongate member. The means for delivering said curable moulding material may be injection moulding means.
In one embodiment, the second moulding member is movable longitudinally relative to the elongate member. Preferably, the second moulding member is slidable relative to the elongate member. In this embodiment, a reaction member is fixedly mounted on the elongate member such that the second moulding member is arranged thereon between the first moulding member and the reaction member.
Preferably, the second moulding member is movable longitudinally relative to the elongate member in a first direction to engage the first moulding member and define said moulding space, and is movable longitudinally relative to the elongate member in a second, opposite, direction to engage the reaction member, whereupon continued movement of the second moulding member in said second direction causes movement of the reaction member and the first moulding member in said second direction. Carrying means may be provided to carry said second moulding member for longitudinal movement relative to the elongate member. The carrying means may comprise a pair of elongate bars, which may extend through apertures in the reaction member.
A second elongate member may be provided around which the first mentioned elongate member may telescope. Thus, when the reaction member is moved in said second direction, the first mentioned elongate member is telescopically movable along the second elongate member.
According to another aspect of the invention there is provided a method for providing a sealing member on a pipe, comprising providing a pipe, arranging moulding means in and around one end region of the pipe to define a moulding space around the perimeter of said end region of the pipe, said moulding means comprising a first moulding member to be inserted into said end region and a second moulding member to be arranged around said end region, delivering a curable moulding material into said moulding space, allowing the moulding material to cure, and thereafter removing said moulding means.
Preferably, the first and second moulding members are movable separately from each other relative to said pipe. An elongate member may be provided on which said first moulding member is fixedly mounted, and the second moulding member may be movable longitudinally relative to said elongate member.
Preferably, the second moulding member is slidable relative to the elongate member.
A reaction member may be provided, and may be fixedly mounted on the elongate member. The reaction member may be so provided that the second moulding member is arranged between the first moulding member and the reaction member. The step of removing the moulding means may comprise moving the second moulding member away from said end region of the pipe, and thereafter removing the first moulding member from said one end region of the pipe. Preferably, when said second moulding member is moved away from said one end region of the pipe, the second moulding member engages the reaction member to move said reaction member away from said one end region of the pipe, thereby to move said first moulding member from said one end region of the pipe.
The moulding space may extend inwardly of the end of the pipe whereby the sealing member so formed provides an inwardly extending flange portion.
Preferably, the moulding space extends radially inwardly of the pipe. The flange portion may define an aperture centrally thereof.
Preferably, the step of moving said first moulding member from said one end region comprises pushing the inwardly extending flange portion of said sealing member so formed across said first moulding member outwardly to enlarge the aperture defined therein.
According to another aspect of this invention there is provided a pipe comprising a sealing member formed on at least one end region thereof, the sealing member being formed by injection moulding.
Preferably, a pipe includes sealing members formed at each end thereof.
The pipe may be a waste pipe for a lavatory.
The sealing member so formed at one region of the pipe may comprise an inwardly extending portion defining an aperture. The inwardly extending portion may be a radially inwardly extending, and the aperture may be defined centrally thereof.
An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings in which:
Fig. 1 is a side elevation of a pipe;
Fig. 2 is a view along the lines II-II in Fig. 1;
Fig. 3 is a cross-sectional view showing apparatus for forming a sealing member at an end region of a pipe;
Fig. 4 is a cross-sectional view apparatus for forming a sealing member at the opposite end region of the pipe shown in Fig. 3.
Referring to Figs. 1 and 2 there is shown a waste pipe 18 for use with a lavatory. The waste pipe 18 comprises a first end region 16 and a second end region 116. A central region 19 extends between the first and second end regions 16, 116. The central region 19 is formed of pleats 19A to enable the pipe to be adjusted to an appropriate length and/or to be bent as appropriate.
One example of suitable such pleats is disclosed in US Specification No. GB 2298470A.
The first end region 16 is provided with a first sealing member 12 formed of a thermoplastic rubber by injection moulding on the end region 16.
The second end region 116 is provided with a second sealing member 112 also formed of a thermoplastic rubber. The method and apparatus for forming the sealing members 12, 112 is described below.
The first sealing member 12 comprises a first portion 12A affixed to the end region 16. The first portion 12A extends circumferentially around the end region 16. A flange portion 12B extends radially inwardly of the first portion 12A and defines an aperture 12C.
The second sealing member 112 comprises a first portion 11 2A affixed to the end region 116 and radially extending flange portions 1 12B extend circumferentially outwardly from the first portion 112A.
Referring to Fig. 3, there is shown apparatus 10 for forming a sealing member 12 on an end region 16 of a pipe 18. The pipe 18 is a waste pipe for use in connecting lavatories to the waste flow of water. The end 16 is intended to fit over an outlet on the lavatory and is provided with the sealing member 12 to prevent leakage of waste water therefrom. The apparatus 10 comprises moulding means 20 in the form of a first moulding member 22 and a second moulding member 24. The first moulding member 22 is fixedly mounted to an elongate tube 26. The second moulding member 24 is provided with the through aperture 28 to receive therethrough the tube 26.
The second moulding member 24 can, therefore, slide along the tube 26.
A reaction member 27 is fixedly mounted to the tube 26 such that the second moulding member 24 is arranged between the first moulding member 22 and the reaction member 27.
The second moulding member 24 is fixedly mounted to a pair of elongate bars 30, 32 which are received in through apertures 34, 36, and extend to moving means 38, the purpose of which will be explained below.
A third moulding member 40 extends around the end region 16 of the pipe 18. A third moulding member 40 is provided in two halves and is damped to the end region 16 of the pipe 18. A moulding space 42 is defined between the first moulding member 22 and the second moulding member 24, and between the third moulding member 40 and the end region 16 of the pipe 18.
In order to form the sealing member 12, an appropriate plastics or rubber material is injected through an injection port 44 to fill the moulding space 42. It will be appreciated that the moulding space 42 extends circumferentially around the end region 16 of the pipe 18. The material used can be, for example, a thermoplastics rubber.
An appropriate technique to be used for forming the sealing member 12 is an injection moulding technique. When the sealing member 12 has been formed, and the thermoplastic rubber has cured, it is then necessary to remove the moulding means 20 from the end region 16 of the pipe 18. This is done by first removing the third moulding member by separating it from the end region 16.
In order to extract the first moulding member 22, the second moulding member 24 is moved in the direction of the arrow A. This is done by the movement means 38 moving the bars 30, 32 in the direction of the arrow A.
The second moulding member 24 slides along the tube 26 towards the reaction member 27. When the second moulding member 24 engages the reaction member 27, the reaction member 27 is also moved in the direction of the arrow A. Since the reaction member 27 is fixedly connected to the tube 26 which, in turn, is fixedly connected to the first moulding member 22. The movement of the reaction member 27 in the direction of the arrow A causes movement of the first moulding member 22 in the same direction.
This movement of the first moulding member 22 causes the portion 12A of the seal 12 to be stretched over the first moulding member 22 thereby enlarging the circular opening defined by the portion 12A.
When the first moulding member 22 has been pulled dear of the pipe 18 and the flange portion 12A of a sealing member 12. The portion 12A returns to its original configuration.
Referring to Fig. 4, there is shown, schematically apparatus 110 for forming a sealing member 112 over the opposite end region 116 of the pipe 18.
Moulding means 120, comprising a first moulding member 122 and a second moulding member 124 is then arranged such that the first moulding member 122 is inserted into the end region 116, and the second moulding member 124 is arranged around the end region 116 of the pipe 18.
The second moulding member 124 is provided in two halves which are clamped together around the end region 116 and the first moulding member 122.
An annular moulding space 142 is defined between the first and second moulding members 122, 124. The second moulding member 124 may be provided with radially extended recesses 126 to provide radially extending fins 112B in the sealing member 112. The purpose of the fins 111B is to enable the end region 116 to be inserted into a larger aperture and for the sealing member 112 to provide an effective seal. The different sized fins 1 12B enable the end region 116 to be inserted into different sized apertures1 as would be appreciated by a person skilled in the art.
When the thermoplastic rubber forming the seal 112 has cured, the first moulding member 122 is extracted from inside the pipe 18 at the end region 116, and the second moulding member 124 is removed from around the end region 116.
The waste pipe 18 so formed can be provided with a self supporting tubular body having laterally extending pleats, such as those described in our co-pending U.K patent application GB 2298470A between the regions 16, 116 of the pipe 18. This enables the pipe 18 so formed to be able to be arranged in any desired appropriate configuration to fit any suitable arrangement of lavatory and waste disposal pipe.
Various modifications can be made without departing from the scope of the invention.
Whilst endeavouring in the foregoing specification to draw attention to those features of the invention believed to be of particular irnportance it should be understood that the Applicant claims protection in respect of any patentable feature or combination of features hereinbefore referred to and/or shown in the drawings whether or not particular emphasis has been placed thereon.
Claims (27)
1. Apparatus for providing a sealing member on a pipe, comprising moulding means comprising a first moulding member insertable into the pipe at one end region thereof and a second moulding member adapted to be arranged around said one end region of the pipe to define, with the first moulding member a moulding space around said one end region of the pipe, and means for delivering a curable moulding material to the moulding space.
2. Apparatus according to Claim 1, wherein the moulding means includes an elongate member on which said first moulding member is mounted, the first moulding member being fixedly mounted on the elongate member.
3. Apparatus according to Claim 2, wherein the second moulding member is movable longitudinally relative to the elongate member.
4. Apparatus according to Claim 2 or 3, wherein the second moulding member is slidable relative to the elongate member.
5. Apparatus according to any of Claims 2 to 4, wherein a reaction member is fixedly mounted on the elongate member such that the second moulding member is arranged thereon between the first moulding member and the reaction member.
6. Apparatus according to Claims 2 to 5, wherein the second moulding member is movable longitudinally relative to the elongate member in a first direction to engage the first moulding member and define said moulding space, and is movable longitudinally relative to the elongate member in a second, opposite, direction to engage the reaction member, whereupon continued movement of the second moulding member in said second direction causes movement of the reaction member and the first moulding member in said second direction.
7. Apparatus according to Claim 6, wherein carrying means is provided to carry said second moulding member for longitudinal movement relative to the elongate member.
8. Apparatus according to Claim 7, wherein the carrying means comprises a pair of elongate bars, which may extend through apertures in the reaction member.
9. Apparatus according to any of Claims 2 to 8, wherein a second elongate member may be provided around which the first mentioned elongate member may telescope.
10. A method for providing a sealing member on a pipe, comprising providing a pipe, arranging moulding means in and around one end region of the pipe to define a moulding space around the perimeter of said end region of the pipe, said moulding means comprising a first moulding member to be inserted into said end region and a second moulding member to be arranged around said end region, delivering a curable moulding material into said moulding space, allowing the moulding material to cure, and thereafter removing said moulding means.
11. A method according to Claim 10, wherein the first and second moulding members are movable separately from each other relative to said pipe.
12. A method according to Claim 10 or 11, wherein an elongate member is provided on which said first moulding member is fixedly mounted, and the second moulding member is movable longitudinally relative to said elongate member.
13. A method according to Claim 12, wherein the second moulding member is slidable relative to the elongate member.
14. A method according to Claim 12 or 13, wherein a reaction member is provided, and is be fixedly mounted on the elongate member.
15. A method according to Claim 14, wherein the reaction member may be so provided that the second moulding member is arranged between the first moulding member and the reaction member.
16. A method according to Claim 14 or 15, wherein the step of removing the moulding means may comprise moving the second moulding member away from said end region of the pipe, and thereafter removing the first moulding member from said end region, whereby, when said second moulding member is moved away from said end region, the second moulding member engages the reaction member to move said reaction member away from said end region, thereby to move said first moulding member from said end region of the pipe.
17. A method according to Claims 10 to 16, wherein the moulding space extends inwardly of the end of the pipe whereby the sealing member so formed provides an inwardly extending flange portion.
18. A method according to Claim 17, wherein the moulding space extends radially inwardly of the pipe, and the flange portion defines an aperture centrally thereof.
19. A method according to Claim 18, wherein the step of moving said first moulding member from said end region of the pipe comprises pushing the inwardly extending flange portion of said sealing member so formed across said first moulding member outwardly to enlarge the aperture defined therein.
20. A pipe comprising a sealing member formed on at least one end region thereof, the sealing member being formed by injection moulding.
21. A pipe according to Claim 20, wherein the pipe includes sealing members formed at each end thereof. The pipe may be a waste pipe for a lavatory.
22. A pipe according to Claim 20 or 21, wherein the sealing member so formed at one region of the pipe comprises an inwardly extending portion defining an aperture.
23. A pipe according to Claim 22, wherein the inwardly extending portion is a radially inwardly extending, and the aperture is defined centrally thereof.
24. Apparatus substantially as herein described with reference to the accompanying drawings.
25. A method substantially as herein described with reference to the accompanying drawings.
26. A pipe substantially as herein described with reference to the accompanying drawings.
27. Any novel subject matter or combination including novel subject matter disclosed, whether or not within the scope of or relating to the same invention as any of the preceding claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9711184A GB2325636B (en) | 1997-05-31 | 1997-05-31 | Improvements in or relating to pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9711184A GB2325636B (en) | 1997-05-31 | 1997-05-31 | Improvements in or relating to pipes |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9711184D0 GB9711184D0 (en) | 1997-07-23 |
| GB2325636A true GB2325636A (en) | 1998-12-02 |
| GB2325636B GB2325636B (en) | 2002-04-17 |
Family
ID=10813306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9711184A Expired - Lifetime GB2325636B (en) | 1997-05-31 | 1997-05-31 | Improvements in or relating to pipes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2325636B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2335017A (en) * | 1998-03-03 | 1999-09-08 | Smiths Industries Plc | Coupling fitting on a hose |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4134431A (en) * | 1977-05-11 | 1979-01-16 | Owens-Corning Fiberglas Corporation | Method of and apparatus for molding spigot rings on pipe sections and product of the method |
| DE2902483B1 (en) * | 1979-01-23 | 1980-04-10 | Berlin Anlagenbau Gmbh | Device for producing sealing rings made of plastic at the plug end of pipes, in particular stoneware pipes |
| GB2035192A (en) * | 1978-10-18 | 1980-06-18 | Battenfeld Maschfab | Method of producing pipe fittings with sealing rings |
| EP0036454A1 (en) * | 1980-03-25 | 1981-09-30 | Hawo B.V. | Method and apparatus for manufacturing a tubular body provided with a sealing ring |
| GB2192577A (en) * | 1986-07-18 | 1988-01-20 | Wavin Bv | Channel conduit couplings |
| GB2192578A (en) * | 1986-07-18 | 1988-01-20 | Wavin Bv | Pipe couplings |
| GB2271157A (en) * | 1992-10-03 | 1994-04-06 | Ford Motor Co | A tubular spigot with barbs of different hardnesses |
| US5370150A (en) * | 1992-08-19 | 1994-12-06 | Dieter Wildfang Gmbh | Process for producing sanitary fitting and sanitary fitting produced according to the process |
| GB2299291A (en) * | 1992-01-06 | 1996-10-02 | Kubota Kk | Manufacturing plastics pipe with a socket by injection moulding |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7909293A (en) * | 1979-12-21 | 1981-07-16 | Wavin Bv | METHOD FOR APPLYING A SEALING BODY IN A GROOVE OF A SOCKET |
| SE464726B (en) * | 1987-10-29 | 1991-06-03 | Forsheda Ab | ROUTE MUFF AND MAKE IT PICTURE THIS |
| SE8800348L (en) * | 1988-02-03 | 1989-08-04 | Forsheda Ab | SEALING RING AND TOOLS FOR PRODUCING THEREOF |
| US5529743A (en) * | 1994-06-30 | 1996-06-25 | Steere Enterprises, Inc. | Methods for the manufacture of clean air ducts |
-
1997
- 1997-05-31 GB GB9711184A patent/GB2325636B/en not_active Expired - Lifetime
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4134431A (en) * | 1977-05-11 | 1979-01-16 | Owens-Corning Fiberglas Corporation | Method of and apparatus for molding spigot rings on pipe sections and product of the method |
| GB2035192A (en) * | 1978-10-18 | 1980-06-18 | Battenfeld Maschfab | Method of producing pipe fittings with sealing rings |
| DE2902483B1 (en) * | 1979-01-23 | 1980-04-10 | Berlin Anlagenbau Gmbh | Device for producing sealing rings made of plastic at the plug end of pipes, in particular stoneware pipes |
| EP0036454A1 (en) * | 1980-03-25 | 1981-09-30 | Hawo B.V. | Method and apparatus for manufacturing a tubular body provided with a sealing ring |
| GB2192577A (en) * | 1986-07-18 | 1988-01-20 | Wavin Bv | Channel conduit couplings |
| GB2192578A (en) * | 1986-07-18 | 1988-01-20 | Wavin Bv | Pipe couplings |
| GB2299291A (en) * | 1992-01-06 | 1996-10-02 | Kubota Kk | Manufacturing plastics pipe with a socket by injection moulding |
| US5370150A (en) * | 1992-08-19 | 1994-12-06 | Dieter Wildfang Gmbh | Process for producing sanitary fitting and sanitary fitting produced according to the process |
| GB2271157A (en) * | 1992-10-03 | 1994-04-06 | Ford Motor Co | A tubular spigot with barbs of different hardnesses |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2335017A (en) * | 1998-03-03 | 1999-09-08 | Smiths Industries Plc | Coupling fitting on a hose |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2325636B (en) | 2002-04-17 |
| GB9711184D0 (en) | 1997-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Expiry date: 20170530 |