IE42251B1 - Improvements relating to the manufacture of pipe couplings - Google Patents

Improvements relating to the manufacture of pipe couplings

Info

Publication number
IE42251B1
IE42251B1 IE159/76A IE15976A IE42251B1 IE 42251 B1 IE42251 B1 IE 42251B1 IE 159/76 A IE159/76 A IE 159/76A IE 15976 A IE15976 A IE 15976A IE 42251 B1 IE42251 B1 IE 42251B1
Authority
IE
Ireland
Prior art keywords
members
mould
moulding
coupling
core
Prior art date
Application number
IE159/76A
Other versions
IE42251L (en
Original Assignee
Hepworth Iron Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hepworth Iron Co Ltd filed Critical Hepworth Iron Co Ltd
Publication of IE42251L publication Critical patent/IE42251L/en
Publication of IE42251B1 publication Critical patent/IE42251B1/en

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
    • B29C45/14622—Lining the inner or outer surface of 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • 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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1657—Making multilayered or multicoloured articles using means for adhering or bonding the layers or parts to each other
    • 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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1676—Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/06—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/06—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end
    • F16L47/08—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end with sealing rings arranged between the outer surface of one pipe end and the inner surface of the sleeve or socket, the sealing rings being placed previously in the sleeve or socket
    • 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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1657—Making multilayered or multicoloured articles using means for adhering or bonding the layers or parts to each other
    • B29C2045/1664—Chemical bonds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/24—Pipe joints or couplings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
    • B29L2031/265—Packings, Gaskets

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Joints With Sleeves (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

1477074 Injection moulding pipe couplings HEPWORTH IRON CO Ltd 19 Jan 1976 [31 Jan 1975] 4372/75 Heading B5A [Also in Division F2] A method of manufacturing a plastics pipe coupling of the sleeve or socket and spigot type comprises injection moulding a second annular member on to a preformed first annular member. The latter may also be injection moulded. The members are interconnected by a chemical and/or mechanical bond. One member may be rigid PVC polypropylene or polyethylene and the other member may be plasticised P.V.C. or a cross-linked thermoplastic rubber. The outer member 1 may be formed with axial ribs 4 provided with end undercuts 5 to provide a mechanical key with the inner member 2. The latter may have a wave-like inner surface for gripping the pipe ends. The coupling 1, 2 may be formed by double injection moulding in the mould shown in Fig. 3. The outer first member 1 is formed by injecting from a nozzle 15 into a cavity defined by a block 10, and sleeve cores 11, 12 supported on cores 7, 9. Following the moulding of the member 1, the sleeve core 12 is retracted along the core 9 the sleeve core 11 is retracted along the core 7 with the nozzle 15, and members 13a-14b are moved radially inwardly to define with the member 1 and cores 7, 9 a second mould cavity in which the second member 2 is formed by injection from a second nozzle (16, Fig. 4 not shown). The composite pipe coupling is ejected by retracting the core 9 to strip the coupling from the core 7 and then sliding the core sleeve 12 along to strip the coupling from the core 9.

Description

This invention relates to the manufacture of plastics pipe couplings either of the sleeve type or of the socket and spigot type for plastics piping or piping of clayware, pitch-fibre, asbestos cement or concrete such as is used in sewers, drains, cable conduit or the like.
According to one aspect of the invention, there is provided a method of manufacturing a plastics pipe coupling comprising a tubular plastics member and an annular sealing member secured thereto, in which method a first said member is preformed and a second said member is injection moulded onto the preformed member so that the said members unite with a mechanical, mechanical/ chemical or chemical bond. - 2 I It is preferred to use chemically compatible materials for the respective members with a view to achieving the optimum chemical bond therebetween when the second member is injection moulded onto the first member. It is however possible to utilize incompatible materials which do not tend chemically to unite when the second member is injection moulded onto the first member by ensuring that the members are relatively configured to provide an interlocking type mechanical bond therebetween.
A preferred application would be of compatible theremoplastic materials for the respective members giving the best chance of a chemical bond with the members also being designed to achieve a mechanical (interlocking) bond. For example the preformed member may comprise the main body member of a coupling and be formed from a rigid PVC or polypropylene and the member which is injection moulded onto the preformed member may comprise a sealing element of the coupling and be formed from a plasticised PVC suitable particularly for plastics pipes made to close tolerances.
For clay pipes with wider diameter tolerances and where resistance to long term shear loads are more important the preformed member may be a coupling sleeve of polyolefine material (polyethylene, polypropylene) and the member injection moulded onto the preformed member may be a sealing member of a thermoplastic rubber (elastomer) cross-linked to give compression-set resistance properties.
It is also within the scope of the invention however for the preformed member to be the sealing member and this could be of a moulded thermosetting rubber material, the tubular member of the coupling being of a thermoplastic material and being injection moulded onto the sealing member with the members being respectively configured to provide a mechanical (interlocking) bond therebetween.
A major application of the invention is in the two-stage or composite moulding of a coupling element where the first member is first injection moulded in a first moulding stage and the second member is then injection moulded onto the preformed member in a second injection moulding stage both of which stages are preferably carried out in a common mould using different mould profiles respectively.
According to another aspect of the invention there is provided apparatus for two stage injection moulding of plastics pipe couplings and comprising a cavity block, a first set of mould members adapted to provide in conjunction with the cavity block a first mould cavity for forming a first annular coupling member in a first injection moulding stage, a second set of mould members adapted to replace the first set in a second injection moulding stage to provide in conjunction with the first coupling member a second mould cavity for forming a second annular coupling member in the second moulding stage, and means providing separate passages for the introduction of moulding material for the first and second moulding stages respectively.
The invention will now be described by way of an example with reference to the accompanying drawings in which: 42351 Fig. 1 is an axial section through a sleevetype coupling element for connecting together plain ended pipes; Fig. 2 is a view on line A-A of Fig.l; Fig. 3 is a sectional view of a composite injection mould for producing the element shown in Figs. 1 and 2, the mould being illustrated in the condition for performing a first injection moulding operation for forming the main body member of the element and Fig.4 is another sectional view of the mould shown in Fig.3, the mould in this case being illustrated in the condition for performing a second injection moulding operation for moulding the seal member of the coupling element onto the preformed main body member.
The coupling element shown in Figs. 1 and 2 comprises a substantially plain cylindrical main body member 1 of rigid polypropylene and an inner sealing member 2 of a suitable elastomer injection moulded onto the body member the nature of the respective materials being such that during the injection moulding of the sealing member onto the body member a chemical bond is to a greater or lesser extent established between the members.
The body member is formed with a central annular pipe-end locating rib 3, a series of circumferentially spaced axially extending ribs 4, and undercuts 5 at the margins, the ribs 4 and undercuts 5 serving to form mechanical means for interlocking the main body and the sealing member together so that in the completed coupling element, these members are interconnected with chemical-mechanical bond.
The sealing member has an internal wave-like formation for sealing against the external surfaces of a pair of plain ended pipes. - 5 42251 Manufacture of the above-described coupling element is effected in a two-stage injection moulding process in apparatus as shown in Figs. 3 and 4.
The moulding apparatus comprises a fixed platen 6 5 carrying a fixed inner core 7 and a moving platen 8 carrying a moving inner core 9 both cores being peripherally profiled as shown to define the wave-like configuration of the coupling sealing member 2. The cores operate in a main cavity block 10 having a moulding cavity the wall of which defines the outer profile of the main body member 1 of the coupling element and a pair of opposed core sleeves 11 and 12 fit over the respective cores 7,9 for sliding movement into and out of the mould cavity. Opposed hydraulically operated pairs of side plates 13a, 13b and 14a, 14b, are linked together for radially inward and outward movement as will be described and the apparatus is completed by a horizontally movable cylinder 15 with associated injection nozzle and a vertically movable cylinder 16 also with associated injection nozzle.
The core sleeve 11 is mechanically linked to the cylinder 15 and the core sleeve 12 is connected to a movable support plate 17.
For the first injection moulding stage, for moulding 25 the main body member 1 of the coupling element (Fig.3) the side plates are in their outer or open position, the cores are closed together within the mould cavity, the core sleeve 12 is positioned within the cavity by advance of the support plate 17 and the horizontal cylinder 15 advanced into a position in which its nozzle is situated in an injection opening 18 in the fixed inner core, advance of - 6 42251 the horizontal cylinder also causing the core sleeve 11 to be advanced into the moulding cavity. In this condition the shape of the main body member 1 of the coupling element is defined between the wall of the moulding cavity and the outer surfaces of the core sleeves, the sleeves and cores having clearance between the respective inner edges for the formation of the annular rib 3 of the coupling element and for the introduction of the moulding material from cylinder 15. First stage injection moulding is thus effected with material from cylinder 15.
After the first stage moulding, the cylinder 15 retracts thereby stripping the core sleeve 11 from the mould cavity and support plate 17 also retracts the core sleeve 12. The side plates 13, 14 are then closed to shut off on the cores and it will be seen from Fig.4 that an injection inlet 19 is formed between the side plate 13a and the main cavity block with the shape of the sealing member 2 of the coupling element being defined between the preformed main body member 1, the cores 7 and 9 and the side plates 13, 14. The vertical cylinder 16 then advances into an injection opening 20 formed between the side plate 13a and the cavity block and second stage moulding is effected through the inlet 19 so that the sealing member 2 is injection moulded onto the pre-formed main body member 1 with these members becoming connected together with a chemical/mechanical bond as previously described.
After the second stage moulding the vertical cylinder retracts and the press opens stripping the completed moulding from the fixed inner core. The main cavity block and side plates are restrained as a unit, whilst the moving 43351 inner core continues to open, stripping the moulding from the fixed core 7. The side plates then open and the support plate 17 closes up to the main cavity block to eject the moulding from the movable core 9. The appar5 atus is then ready to commence the next moulding cycle.

Claims (16)

1. A method of manufacturing a plastics pipe coupling comprising a tubular plastics member and an annular sealing member secured thereto, in which method 5 a first said member is preformed and a second said member is injection moulded onto the preformed member so that the said members unite with a mechanical, mechanical/ chemical or chemical bond.
2. A method as claimed in claim 1 wherein the 10 materials used for the said members are chemically compatible to achieve optimum chemical bonding of the members.
3. A method as claimed in claim 1 wherein the materials used for the said members are chemically in15 compatible, the members being configured to provide the mechanical bonding thereof.
4. A method as claimed in claim lor 2, wherein the materials used for the said members are compatible thermoplastic materials to achieve the chemical bond, the 20 members being mutually configured so that a mechanical bond is also achieved between the two members.
5. A method as claimedin claim 1, 2, 3 or 4 wherein said tubular member is formed of a rigid polypropylene material.
6. A method as claimed in any preceding claim wherein said annular sealing member is made of a thermoplastic rubber cross-linked to provide compression-set resistance properties. 5
7. A method as claimed in claim 1 wherein the sealing member of the coupling is preformed of a moulded thermosetting rubber material, and said tubular member is formed of a thermoplastic material and is injection moulded onto the sealing member with the members being 10 mutually configured to provide a mechanical bond therebetween .
8. A method as claimed in claim 1, wherein said first member is first injection moulded in a first moulding stage and said second member is then injection moulded onto 15 the preformed member in a second injection moulding stage.
9. A method as claimed in claim 8 wherein the first and second injection moulding stages are carried out in a common mould using different mould profiles respectively. 20
10. Apparatus for two stage injection moulding of plastics pipe couplings and comprising a cavity block, a first set of mould members adapted to provide in conjunction with the cavity block a first mould cavity for forming a first annular coupling member in a first injection moulding 25 stage, a second set of mould members adapted to replace the first set in a second injection moulding stage to provide in conjunction with the first coupling member a second mould cavity for forming a second annular coupling member in the 4 22» I second moulding stage, and means providing separate passages for the introduction of moulding material for the first and second moulding stages respectively.
11. Apparatus as claimed in claim 10 wherein said second set of mould members includes a mould core divided into two portions a movable portion and a fixed portion, the two portions being arranged to substantially abut one another substantially centrally of the mould cavity during an injection moulding operation and define an annular gap between them and the mould cavity.
12. Apparatus as claimed in claim 11 wherein end surface sections of the two portions adjacent the abutting ends thereof and which extend within the mould cavity, are peripherally profiled.
13. Apparatus as claimed in claim 10, 11 or 12 wherein the radially outer wall of the second mculd cavity is provided with circumferentially spaced axially extending ribs each having undercut portions at their ends.
14. A pipe coupling made by the method as claimed in any one of claims 1 to 9.
15. Apparatus for injection moulding a pipe coupling substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
16. A method of manufacturing a plastics pipe coupling substantially as hereinbefore described with reference to the accompanying drawings.
IE159/76A 1975-01-31 1976-01-28 Improvements relating to the manufacture of pipe couplings IE42251B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB437275A GB1477074A (en) 1975-01-31 1975-01-31 Manufacture of pipe couplings

Publications (2)

Publication Number Publication Date
IE42251L IE42251L (en) 1976-07-31
IE42251B1 true IE42251B1 (en) 1980-07-02

Family

ID=9775940

Family Applications (1)

Application Number Title Priority Date Filing Date
IE159/76A IE42251B1 (en) 1975-01-31 1976-01-28 Improvements relating to the manufacture of pipe couplings

Country Status (21)

Country Link
JP (1) JPS602168B2 (en)
AU (1) AU500717B2 (en)
BE (1) BE838058A (en)
BR (1) BR7600594A (en)
CA (1) CA1081419A (en)
CS (1) CS214730B2 (en)
DD (1) DD124239A5 (en)
DE (1) DE2603393C2 (en)
DK (1) DK152567B (en)
ES (1) ES444820A1 (en)
FI (1) FI760226A7 (en)
FR (1) FR2299143A1 (en)
GB (1) GB1477074A (en)
IE (1) IE42251B1 (en)
IT (1) IT1057104B (en)
NL (1) NL7600937A (en)
NZ (1) NZ179865A (en)
PT (1) PT64746B (en)
SE (1) SE7600996L (en)
SU (1) SU673160A3 (en)
ZA (1) ZA76377B (en)

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Also Published As

Publication number Publication date
CS214730B2 (en) 1982-05-28
SU673160A3 (en) 1979-07-05
DE2603393C2 (en) 1986-06-05
FR2299143A1 (en) 1976-08-27
ZA76377B (en) 1977-01-26
ES444820A1 (en) 1977-09-01
SE7600996L (en) 1976-08-01
PT64746A (en) 1976-02-01
DK30576A (en) 1976-08-01
FR2299143B1 (en) 1978-11-10
JPS5217567A (en) 1977-02-09
AU500717B2 (en) 1979-05-31
DD124239A5 (en) 1977-02-09
CA1081419A (en) 1980-07-15
AU1072176A (en) 1977-08-11
NZ179865A (en) 1978-04-03
PT64746B (en) 1977-08-16
IE42251L (en) 1976-07-31
NL7600937A (en) 1976-08-03
BR7600594A (en) 1976-08-31
BE838058A (en) 1976-05-14
FI760226A7 (en) 1976-08-01
JPS602168B2 (en) 1985-01-19
IT1057104B (en) 1982-03-10
DK152567B (en) 1988-03-21
DE2603393A1 (en) 1976-08-19
GB1477074A (en) 1977-06-22

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