CA1081419A - Manufacture of pipe couplings - Google Patents

Manufacture of pipe couplings

Info

Publication number
CA1081419A
CA1081419A CA244,600A CA244600A CA1081419A CA 1081419 A CA1081419 A CA 1081419A CA 244600 A CA244600 A CA 244600A CA 1081419 A CA1081419 A CA 1081419A
Authority
CA
Canada
Prior art keywords
injection
moulding
cavity
moulded
coupling
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.)
Expired
Application number
CA244,600A
Other languages
French (fr)
Inventor
John B. Glover
Maurice J. Threadgold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hepworth Iron Co Ltd
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
Application granted granted Critical
Publication of CA1081419A publication Critical patent/CA1081419A/en
Expired legal-status Critical Current

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

Abstract

ABSTRACT OF THE DISCLOSURE
The invention provides a method of manufacturing a plastics pipe coupling of the kind comprising a tubular member of stiff plastics material and a resilient elastomeric annular sealing member secured therein for engaging a pipe end when inserted into the coupling, which method comprises preforming a first of the said members, disposing the preformed member in injection-moulding apparatus in such a way that the preformed member defines at least one mould member of said apparatus an annular moulding cavity, and injection moulding the other said member in the said cavity thereby forming the other said member bonded to the first member.

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 present invention there is provided a method of manufacturing a plastics pipe coupling of the kind comprising a tubular member of stiff plastics material and a resilient elastomeric annular sealing member secured therein for engaging a pipe end when inserted into the coupling, which method comprises preforming a first of the said members, disposing the preformed member in injection-moulding apparatus in such a way that the preformed member defines at least one mould member of said apparatus an annular moulding cavity, and injection moulding the other said member in the said cavity thereby forming the other said member bonded to the first member.
It is preferred to use chemically compatible materials for the respective annular members with a view to achieving the optimum chemical bond therebetween when the one member is injection moulded onto the other member. It is however possible to utilize incompatible materials which do not tend chemically to unite when the one member is injection moulded onto the other member by ensuring that the members are relatively configured to provide an interlocking type mechanical bond therebetween.
A preferred application would be of compatible , thermoplastic material for the respective members giving the best chance of a chemical bond .

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~081419 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 cou ling and be formed from a rigid PVC or polypropylene and the annular m~mber 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 again be the main body member of the coupling of polyolethene material (polyethylene, polypropylene) and the member injection moulded onto the preformed member may again be a sealing member of the coupling 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 a sealing member of the coupling and this could be of a moulded thermosetting rubber material, the main body : :

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'`; 30 !.

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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 preformed second annular member is first injection moulded in a first moulding stage and the first annular member is then injection moulded onto the preformed member in a second injection 10 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 moulding of plastics pipe couplings of the kind comprising a tubular member of stiff .
plastics material and a resilient annular sealing member secured ` therein for engaging a pipe and when inserted into the coupling, said apparatus comprising a cavity block defining the external periphery of a cavity, a core assembly disposed in said cavity ;~ with an annular gap between the internal surface of the mould.; 20 block and the peripheral surface of the core assembly, said core assembly comprising core members mounted for axial relative movement, said core members having a first position in which the core assembly in cooperation with the cavity block defines a ''~?~ first moulding cavity, a first injection.moulding nozzle adapted ~i to communicate with said first moulding cavity for injection ,~
i: moulding a first member of a said pipe coupling, said core ~ members having a second position in which there is defined in cooperation with the injection-moulded first member of the pipe coupling a second moulding cavity, and a second injection moulding ~ 30 nozzle adapted to communicate with said second moulding cavity i for injection moulding the other aforesaid member of the pipe~ `
. coupling in contact with the said first member of the pipe coupling.
~ , ~ -3-;~. ' ';'.# .

. ', ~ ' ' , The invention will now be described by way of an examp:Le with reference to the accompanying drawings in wr.ich:
Fig. 1 is an axial section through a sleeve-type 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 mouled 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.

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~30 . , .,;. - ' : . ' 108~419 ~he coupling element ~how~ in Figs. 1 and
2 comprise~ a substantially plain cylindrical main bod~ member 1 of rigid polypropylene and an inner ~ealing member 2 of a suitable elastomer injection moulded onto the body member the nature of the ' re~pective materials baing such that durin~
-~ the inJection moulding of the sealing member ontothe body member a chemical bond is to a greater or les~er extent established between the members.
The body member i8 formed with a central annular pipe-end locating rib 3, a serie~ of circumferentially ~paced 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 bod~ and the ,~ sealing member together 80 that in the completed coupling element, these members are interconnected 7 with chemical- mechanical bond. ~he sealing memberji .~
~ has an internal wave-li~e formation for ~ealing ;~, 20 against the external surface~ of a pair of plain , j '.. `! ended pipes-.:t `i r~r - Manufacture Or the above-described coupling ~'~i element i~ effected in a two-stage in~ection ,i moulding proces~ in apparatu~ a~ ~hown in ~'~ 25 Fig~. 3 and 4.
,~,. .

., .
: ~ _ 5 _ ...

. ~

,~
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108~419 ~he moulding apparatua comprise~ a fixed : platen 6 carrying a fixed inner core 7 and a moving platen 8 carrying a moving inner core 9 both core~ being pe~ipherally profiled as : 5 showR to define the wave-like configuration o~ the : coupling ~ealing member 2. ~he cores operate : in a main cavity block 10 having a moulding cavit~
the wall of which define~ the outer profile o~ the main body member 1 of the coupling element and a ! 10 pair of opposed core sleeve~ 11 and 12 ~it over there~pecti~e cores for sliding movement into and out of tha mould ca~ity. Opposed hydraulically ~ operated pair~ Or side plates 13a, 1~ and 14a, 14b : are linked together for radially inward and outwardmovement as will be described and the appRratus i8 ~ completed by a horizontally movable cyli~der 15 with
3 a~sociated injection ~ozzle and a vertically movable cylinder 16 also with associated injection nozzle.
~ The core sleeve 11 is mechanically linked to i 20 the cylinder 15 and the core sleeve 12 is connected. to a ~o~able support plate 17.
:. For the first in~ection mouldiRg ~tage, ;: fox moulding the main body member 1 of the ¢oupling element (Fig. 3) the side plates are ; 25 in their outer or open po~itio~, the core~ are :

.

. l ,, , ~ , , ;

1~8:1419 closed together within the mould cavity, the core ~leeve 12 is positio~ed within the cavity b~ advance of the support plate 17 and the horizontal cylinder 15 ad~anced into a position in which its nozzle i8 ~ituated in an injection opening 18 in the ~ixed i~ner core, advance of the horizontal cylinder al~io causing the core sleeve 11 to be advanced into the moulding cavitg. In this ¢ondition the shape of the main body member 1 of the coupling element i~i defined between the ' wall of the moulding cavity and the outer surfaceis of the core sleeves, the sleeves a~d cores having clearance between the respective inner edgss for the formation of the annular rib 3 of the .; .
;;~ 15 coupli~g element and for the introduction of the moulding material from cylinder 15. ~irst stage ., injection mouldi~g is thus effected with material i from cylinder 15.
i After the firæit ~tage moulaing~ the cylinder 15 retract~ thereby stripping the core ~ileeve 11 ` from the mould cavity and support plate 17 also ; retracts the strip of the core slecve 12. The side plates 13, 14 are then closed to shut off on the : core~ and it will be seen from ~i.g. 4 that an ~, 25 i~ection inlet 19 is formed between the ~ide plate . ..
-- 7. --";

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.. .. . . . . .. . . ... . . .. . . . . . . . .. . ..

10 8~ 419 13a and the main cavity block with the ~hape Or the sealing member 2 of the coupling element being defined between the pre-~ormed main bod~ member 1, the cores 7 and 9 and the ~ide plates 13, 14. ~he ~ertical cylinder 16 then advances into an injection ope~ing 20 formed between the side plate 13a and the cavity block and ~econd stage moulding is ef~ec~ed ; through the inlet 19 ~o that the ~ealing member 2 i~ inJection moulded o~to the pre-formed main body ~ ! , 10 member 1 with the~e member~ becoming con~e¢ted ; together with a chemical/mechanical bond as i previously described.
fter the seaond stage moulding the vertical -; cylinder retracts and the press opens stripping the , j .
~i ' 15 completed moulding from the fi~ed inner core. ~he ~ main ca~ity block and side plates are restrained as -1 ~ a unit, whil3t the moving in~er core continues to open, stripping the moulding from this core~ ~he -i - side plates then open and the ~upport plate 17 closes up to the main cavity block to e~ect the moulding. ~he apparatuæ is then ready to comme~ce the next moulding cycle.

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Claims (10)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of manufacturing a plastics pipe coupling of the kind comprising a tubular member of stiff plastics material and a resilient elastomeric annular sealing member secured therein for engaging a pipe end when inserted into the coupling, which method comprises pre-forming a first of the said members, disposing the preformed member in injection-moulding apparatus in such a way that the preformed member defines at least one mould member of said apparatus an annular moulding cavity, and injection moulding the other said member in the said cavity thereby forming the other said member bonded to the first member.
2. A method as in claim 1, in which the first member is configured to provide mechanical keying together of the members.
3. A method of manufacturing a plastics pipe coupling of the kind comprising a tubular member of stiff plastics material and a resilient elastomeric annular sealing member secured therein for engaging a pipe end when inserted into the coupling, which method comprises disposing a mould and a core assembly in coaxial relation to define a first annular moulding cavity, injection moulding a first material in said cavity thereby forming a first said member, effecting axial movement of a portion of said core assembly thereby forming a second annular mould cavity bounded partly by the injection-moulded first member, and injection moulding a second material in said second cavity thereby forming the other said member bonded to the said first member.
4. A method as claimed in claim 3, wherein the first moulding cavity is configured to provide mechanical keying means on the first injection-moulded member, said keying becoming keyed to the said other injection-moulded member during injection moulding of the latter.
5. A method as in claim 1, 2 or 3, in which the plastics material and the elastomeric material of the sealing member are chemically compatible and form a direct bond therebetween.
6. A method as claimed in claim 1 or 3, wherein the said first member is the sealing member and consists of an elastomer.
7. A method as claimed in claim 1 or 3, wherein the said other member is said tubular member of stiff plastics material and the first moulded member is the sealing member.
8. A method as claimed in claim 1 or 3, wherein the first member is the sealing member and is a cross-linkable thermoplastic rubber.
9. A method as claimed in claim 1 or 3, wherein the first member is said tubular plastics member and the moulded other member is the sealing member.
10. A pipe coupling comprising a tubular member of injection-moulded stiff plastics material and at least one annular sealing member of injection-moulded elastomeric material disposed therein for engaging an inserted pipe end, said members being bonded directly one to the other by the injection moulding thereof.
CA244,600A 1975-01-31 1976-01-30 Manufacture of pipe couplings Expired CA1081419A (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 (1)

Publication Number Publication Date
CA1081419A true CA1081419A (en) 1980-07-15

Family

ID=9775940

Family Applications (1)

Application Number Title Priority Date Filing Date
CA244,600A Expired CA1081419A (en) 1975-01-31 1976-01-30 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) FI760226A (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
AU1072176A (en) 1977-08-11
SE7600996L (en) 1976-08-01
DD124239A5 (en) 1977-02-09
DE2603393A1 (en) 1976-08-19
BE838058A (en) 1976-05-14
DK30576A (en) 1976-08-01
PT64746B (en) 1977-08-16
SU673160A3 (en) 1979-07-05
BR7600594A (en) 1976-08-31
NZ179865A (en) 1978-04-03
FR2299143B1 (en) 1978-11-10
JPS602168B2 (en) 1985-01-19
AU500717B2 (en) 1979-05-31
GB1477074A (en) 1977-06-22
NL7600937A (en) 1976-08-03
PT64746A (en) 1976-02-01
FI760226A (en) 1976-08-01
CS214730B2 (en) 1982-05-28
ES444820A1 (en) 1977-09-01
DE2603393C2 (en) 1986-06-05
DK152567B (en) 1988-03-21
FR2299143A1 (en) 1976-08-27
IT1057104B (en) 1982-03-10
JPS5217567A (en) 1977-02-09
ZA76377B (en) 1977-01-26
IE42251L (en) 1976-07-31
IE42251B1 (en) 1980-07-02

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