GB1569656A - Mould for sealing cables to submarine repeater housings - Google Patents
Mould for sealing cables to submarine repeater housings Download PDFInfo
- Publication number
- GB1569656A GB1569656A GB2293577A GB2293577A GB1569656A GB 1569656 A GB1569656 A GB 1569656A GB 2293577 A GB2293577 A GB 2293577A GB 2293577 A GB2293577 A GB 2293577A GB 1569656 A GB1569656 A GB 1569656A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- insert
- ring
- cable
- plastics
- 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
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
- H02G1/145—Moulds
-
- 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
- B29C45/14639—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 for obtaining an insulating effect, e.g. for electrical components
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Cable Accessories (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Description
(54) MOULD FOR SEALING CABLES TO SUBMARINE REPEATER HOUSING (71) We, STANDARD TELEPHONES AND
CABLES LIMITED, a British Company, of 190 Strand, London, W.C.2, England, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to housings for telephone or telegraph repeaters and in particular to the provision of bulkhead glands in such housings.
An important feature of a telephone or telegraph repeater, and particularly a submarine repeater, is the construction of the bulkhead glands through which the cables feeding the repeaters are hermetically sealed.
The glands are generally injection moulded
from a thermoplastics material such as
polyethylene or polypropylene using a side gate mould. A major problem with such a
construction is the critical control of the
injection moulding process so that the ad
vancing melt front spreads out across the
mould so as to reach the various extremi
ties substantially simultaneously. If this pro
cess is not performed accurately- there is a
considerable risk that two advancing melt
fronts will meet to form a weld line with
possible impairment of the - electrical and
mechanical properties of the gland. Further
more, injection of molten plastics via a side
gate tends to cause deflection of the cable
core. Tensioning of the centre conductor of
the cable is required to reduce this effect.
According to the invention there is provided a ring gate mould assembly for pro
viding an injection moulded plastics seal
between a housing and a cable entering the housing, the assembly including a two part
split mould having an axial bore for receiv
ing and locating the cable, means for secur
ing the mould to the housing, a side entry
port for the injection of plastics material
into the mould, and a ring gate insert
located in a recess in the mould adjacent the
entry port, arranged so as to obstruct the flow of plastics material injected from the
entry port so as to deflect the plastics into
a single melt front, said ring gate insert
having an axial bore aligned with that in
the mould and extending throughout the
insert, and in which said ring gate insert has
a cylindrical body portion whereby the in
sert is located in a recess in the mould,
and a smaller diameter ring portion extend
ing from one end face of the insert and
arranged eccentrically with respect to the
axis of the body portion, and in which the
insert is arranged with the eccentric ring
portion adjacent the entry port.
An embodiment of the invention will now
be described with reference to the accom
panying drawings in which: Fig. 1 shows one half of a ring gate split
mould for preparing an injection moulded
plastics bulkhead gland;
Fig. 2 shows the construction of the insert
providing the ring runner and ring gate of
the mould of Fig. 1.
Referring to the drawings, the mould is
split into two halves one of which is shown
in Fig. 1. The mould includes an elongated
tail portion 11, a forward body portion 12
and a flange member 13 whereby the mould
is secured to the housing of a repeater by
bolts 14 during the gland moulding process.
The tail - portion 11 has an axial parallel
bore 15 for receiving and securing a plastics
coated cable (not shown) for connection to
the repeater. A tube 16 communicating with
the body portion 12, bore 15 and and mould
cavity 22 is provided through the side of the
mould for the injection of molten plastics
material, e.g. polyethylene or polypropylene.
The mould is provided with heaters (not
shown) to facilitate plastics injection and
subsequent annealing.
The mould insert 31, (Fig. 2) which is
made from the same material as the mould,
comprises a cylindrical body portion 18
which locates in a corresponding recess 21
provided in the mould and has an axial
bore 19 which, when the insert 31 is located
in the mould, provides a continuation of
the mould cavity 22. The ring runner of the insert 31 is provided by an eccentrically turned member 17 on the face of the insert adjacent the entry point of the injection tube 16.
The ring gate of the arrangement is provided by the predetermined clearance 23 between the recess 21 and the end face of the eccentric member 17. The insert 31 is located in the mould as shown in Fig. 1 such that. during the injection process, the molten plastics material fed through the tube 16 flows around the periphery of the ring runner 17 thus providing a radial flow of plastics material through the ring gate 23 and into the mould cavity 22.
To ensure a symmetrical flow of molten plastics into the mould. it is essential that the ring gate 23 presents the maximum impedance to the flow at the entry point of the injection tube 16. The mould insert 31 should therefore be arranged in the mould such that the eccentric ring runner 17 is disposed adjacent the injection tube 16. For this purpose the insert 31 is provided with one or more radial bores 24 for engaging a corresponding locating peg or pegs (not shown) in the mould cavity 21.
To prepare a bulkhead gland sealing a cable to a repeater housing, the insert 31 is threaded over the cable with the ring runner 17 facing away from the repeater. The two halves of the split mould are clamped together around the cable locating the insert in the recess and the ring runner 17 adjacent the injection tube 16. The mould assembly is secured to the repeater body via bolts 14 and molten plastics is injected through the tube 16. The injected plastics flows symmetrically into the mould displacing the original cable coating within the mould setting up a weld line interface between these two materials. To produce an effective weld it is important that the in jected plastics should be compatibIe with the cable coating. FLuallyt after annealing, the mould is removed to leave the completed gland seal.
WHAT WE CLAIM IS:
1. A ring gate mould assembly for providing an injection moulded plastics seal between a housing and a cable entering the housing, the assembly including a two part split mould having an axial bore for receiving and locating the cable, means for securing the mould to the housing, a side entry port for the injection of plastics material into the mould, and a ring gate insert located in a recess in the mould adjacent the entry port, arranged so as to obstruct the flow of plastics material injected from the entry port so as to deflect the plastics into a single melt front, said ring gate insert having an axial bore aligned with that in the mould and extending throughout the insert, and in which said ring gate insert has a cylindrical body portion whereby the insert is located in a recess in the mould.
and a smaller diameter ring portion extending from one end face of the insert and arranged eccentrically with respect to the axis of the body portion, and in which the insert is arranged with the eccentric ring portion adjacent the entry port.
2. A ring gate assembly as claimed in claim 1, and in which the insert has locating means for engaging corresponding locating means in the mould.
3. A ring gate mould assembly substantially as described herein with reference to the accompanying drawings.
4. A method of providing a bulkhead gland seal between a telephone or telegraph repeater and a cable feeding the repeater, which method is substantially as described herein with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (4)
1. A ring gate mould assembly for providing an injection moulded plastics seal between a housing and a cable entering the housing, the assembly including a two part split mould having an axial bore for receiving and locating the cable, means for securing the mould to the housing, a side entry port for the injection of plastics material into the mould, and a ring gate insert located in a recess in the mould adjacent the entry port, arranged so as to obstruct the flow of plastics material injected from the entry port so as to deflect the plastics into a single melt front, said ring gate insert having an axial bore aligned with that in the mould and extending throughout the insert, and in which said ring gate insert has a cylindrical body portion whereby the insert is located in a recess in the mould.
and a smaller diameter ring portion extending from one end face of the insert and arranged eccentrically with respect to the axis of the body portion, and in which the insert is arranged with the eccentric ring portion adjacent the entry port.
2. A ring gate assembly as claimed in claim 1, and in which the insert has locating means for engaging corresponding locating means in the mould.
3. A ring gate mould assembly substantially as described herein with reference to the accompanying drawings.
4. A method of providing a bulkhead gland seal between a telephone or telegraph repeater and a cable feeding the repeater, which method is substantially as described herein with reference to the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2293577A GB1569656A (en) | 1977-05-31 | 1977-05-31 | Mould for sealing cables to submarine repeater housings |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2293577A GB1569656A (en) | 1977-05-31 | 1977-05-31 | Mould for sealing cables to submarine repeater housings |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1569656A true GB1569656A (en) | 1980-06-18 |
Family
ID=10187455
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2293577A Expired GB1569656A (en) | 1977-05-31 | 1977-05-31 | Mould for sealing cables to submarine repeater housings |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1569656A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017005289A1 (en) * | 2015-07-06 | 2017-01-12 | Abb Schweiz Ag | A method of building an insulation system around a naked conductor section of a power cable |
-
1977
- 1977-05-31 GB GB2293577A patent/GB1569656A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017005289A1 (en) * | 2015-07-06 | 2017-01-12 | Abb Schweiz Ag | A method of building an insulation system around a naked conductor section of a power cable |
US10483730B2 (en) | 2015-07-06 | 2019-11-19 | Nkt Hv Cables Gmbh | Method of building an insulation system around a naked conductor section of a power cable |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
746 | Register noted 'licences of right' (sect. 46/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |