GB1603169A - Creation of Inventions and Patents with Artificial Intelligence

GB1603169A – Electrically welding plastic sleeve
– Google Patents

GB1603169A – Electrically welding plastic sleeve
– Google Patents
Electrically welding plastic sleeve

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Publication number
GB1603169A

GB1603169A
GB24850/78A
GB2485078A
GB1603169A
GB 1603169 A
GB1603169 A
GB 1603169A
GB 24850/78 A
GB24850/78 A
GB 24850/78A
GB 2485078 A
GB2485078 A
GB 2485078A
GB 1603169 A
GB1603169 A
GB 1603169A
Authority
GB
United Kingdom
Prior art keywords
sleeve
wire
recess
welding muff
sleeve member
Prior art date
1977-06-03
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
GB24850/78A
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.)

Von Roll AG

Original Assignee
Von Roll AG
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.)
1977-06-03
Filing date
1978-05-31
Publication date
1981-11-18

1978-05-31
Application filed by Von Roll AG
filed
Critical
Von Roll AG

1981-11-18
Publication of GB1603169A
publication
Critical
patent/GB1603169A/en

Status
Expired
legal-status
Critical
Current

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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

H02G15/00—Cable fittings

H02G15/08—Cable junctions

H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes

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

B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor

B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure

B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. “verlorenes Schweisselement”

B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. “verlorenes Schweisselement” characterised by the type of heated elements which remain in the joint

B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. “verlorenes Schweisselement” characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding

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

B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor

B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure

B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. “verlorenes Schweisselement” characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings

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

B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor

B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure

B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. “verlorenes Schweisselement” characterised by the composition of the heated elements which remain in the joint

B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. “verlorenes Schweisselement” characterised by the composition of the heated elements which remain in the joint being metallic

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

B29C66/00—General aspects of processes or apparatus for joining preformed parts

B29C66/01—General aspects dealing with the joint area or with the area to be joined

B29C66/05—Particular design of joint configurations

B29C66/10—Particular design of joint configurations particular design of the joint cross-sections

B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section

B29C66/112—Single lapped joints

B29C66/1122—Single lap to lap joints, i.e. overlap joints

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

B29C66/00—General aspects of processes or apparatus for joining preformed parts

B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles

B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles

B29C66/52—Joining tubular articles, bars or profiled elements

B29C66/522—Joining tubular articles

B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative 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

B29C66/00—General aspects of processes or apparatus for joining preformed parts

B29C66/52—Joining tubular articles, bars or profiled elements

B29C66/522—Joining tubular articles

B29C66/5229—Joining tubular articles involving the use of a socket

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

F16L47/02—Welded joints; Adhesive joints

F16L47/03—Welded joints with an electrical resistance incorporated in the joint

Abstract

The disclosed sleeve is of the type including a resistance heating wire embedded in a thermoplastic sleeve material. A first sleeve member of insulating thermoplastic is molded with axially spaced integral annular receptacle wall members extending out from the outer surface and defining recesses. The walls have two diametrically opposite guide slots. Extending upwards from the center of each recess is a wire support stud. A resistance wire wound on the first sleeve between the wall members has its end sections passed through the slots and over the support stud, so that portions of the wire lie exposed against the side faces of the stud. A second sleeve member of insulating material is molded over the first sleeve so that the wire is embedded in the second sleeve but remains exposed within the recesses. The second sleeve material fills in the slots above the wire to thereby fix the wire in place in the slots. This permits a mating connector element to be inserted in the recess with its bore receiving the wire and wire support, so that electrical contact is made to the wire.

Description

PATENT SPECIFICATION
( 21) ( 31) ( 33) ( 44) Application No 24850/78 ( 22) Filed 31 May 1978 Convention Application No 6890/77 ( 32) Filed 3 Jun.
Switzerland (CH) Complete Specification Published 18 Nov 1981 ( 11) (li 1977 in ( 51)INT CL 3 HO 5 B 3/58 ( 52) Index at Acceptance H 5 H 111 130 155 223 224 230 231 232 251 257 258 AF ( 54) ELECTRICALLY WELDING PLASTIC SLEEVE ( 71) We, WERNER STURM AND VON ROLL AG, respectively a citizen of West Germany and a Swiss Body Corporate of Allerheiligenstrasse 624, Hagendorf/ Switzerland, and Gerlafingenz Switzerland, respectively, 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:
The invention relates to a method for producing an electrically welding plastic muff having embedded therewithin an electrical resistance heating wire whose end sections are formed into contacts The invention also provides a welding muff produced by this method.
Various methods are known for the production of electrically welding plastic muffs with which it is possible to produce a connection between sections of pipes and/or shaped members and fittings by heating the joint by electrical resistance heating The welding muffs have a sleeve member in the inside of which is appropriately embedded the electrical resistance heating wire necessary for heating purposes The sleeve member can either be constructed as a one-part tubular member or as a multipart member whose individual parts are produced successively.
In order to connect the resistance heating wire of such a welding muff with a power supply, connections are provided on the outside of the muff, particularly plug and socket connections, which connections on the one hand bring about a satisfactory electrical contact and on the other provide reliable protection against electric shocks.
In general, the manufacture of such plug and socket connections constitutes an expensive operation in the manufacture of the welding muff Separate parts used for the plug and socket connection must be connected with the resistance heating wire, or 1 603 169 X t the ends of the wire can be passed through the sleeve member and shaped in an appropriate manner to form an element of a plug and socket connection, e g a contact pin or stud Difficulties are encountered in inserting the ends of the coiled resistance heating wire through to the outside of the sleeve member, due to inadequate supporting or guidance of the end of the wire.
It would be desirable to so further develop a method of the type indicated hereinbefore that it is possible to produce the welding muff, and in particular its electrical connections, with limited expenditure and reliable guidance of the end of the wire.
According to the present invention there is provided a method of forming a plastics welding muff comprising forming a first plastics sleeve member with at least one outwardly extending wall defining a recess, locating a resistance heating wire helically along a surface of said first sleeve member with a U-shaped loop exposed within said recess and supported within said recess to form electrical connection means to cooperate with complementary connection means, and forming a second plastics sleeve member coaxially around or within the first sleeve member, to embed the helically wound wire, the U having its axis of symmetry extending radially of said sleeve.
The invention also provides an electric welding muff comprising an insulating thermoplastic sleeve extending along a longitudinal axis, a helically wound resistance heating wire embedded in said sleeve about said axis, means for forming a first electrical connection to said wire, and means for forming a second electrical connection to said wire, wherein said means for forming a first electrical connection to said wire comprises: a recess formed in said sleeve; a support member at said recess and extending radially relative to said sleeve; and a 8 \ \ O 1,603,169 contact defining portion of said wire formed in a U-shaped ioop which is exposed in said recess and coupled to and supported by said support member to permit said wire to contact complementary connection means coupled to an electrical source of energy, the U having its axis of symmetry extending radially of said sleeve.
In the case of the welding muff produced by the method of the invention, the contact defining portion of the resistance heating wire is supported by a support member at the recess in the sleeve member in such a way that the end section of the resistance heating wire can be secured in a plug and socket connection.
Thus, even when using the end of the resistance heating wire as the contact defining portion, a reliable, durable electrical connection with a completely satisfactory protection against electric shocks is obtained.
The invention is described in greater detail hereinafter relative to a preferred embodiment and with reference to the attached drawings, which show:
Fig 1 a partial vertical section through an electrically heatable welding sleeve in accordance with a preferred embodiment of the present invention The sleeve is made from thermoplastic material with two radially directed contact pins extending from the outside of the sleeve member for a plug and socket connection.
Fig 2 a cross-section along the line II-II of Fig 1.
Fig 3 an enlarged representation, equivalent to the cutaway portion A of Fig 1, showing a preferred embodiment; Fig 4 a section along the line IV-IV of Fig 3.
Fig 5 a variant of the contact plug cross-section.
The electrical welding sleeve made from thermoplastic material partly shown in Fig.
1 has an electrical receptacle in the form of a contact plug 2 located in an approximately radially directed receptacle recess 3 in the wall of sleeve member 1 whose walls 4 form an effective protection against electric shock.
The sleeve member 1 of Fig 1 comprises a supporting body 5 on whose outside is wound in separate coils an electrical resistance heating wire 6 and a sleeve outer part 7 The welding sleeve in turn comprises the sleeve member 1 and the electrical connections, i e the contact plug 2 arranged in recess 3.
The sleeve member 1 can be constructed in various ways For example, the supporting body 5 can be produced in a first injection mould and can subsequently be wound Then in a second injection moulding operation the sleeve outer part 7 can be injection moulded around the inner supporting body 5 However, it is also possible to produce the sleeve member first and then place the resistance heating wire 6 in an appropriate manner on the inside thereof, after which it is connected to the sleeve inner part.
Figs 2 and 3 show that contact plug 2 has a body portion comprising a support tongue integral with the inner supporting body 5 and has the resistance heating wire 6 wound onto the outside of the inner supporting body 5 so as to form a U-shaped loop 8 over the support tongue 10 with two approximately radially directed lengths 9 passing up each side and over the support tongue so that the axis of symmetry of the U is radial to the sleeve 1 This arrangement is more clearly visible in the enlarged representations of Figs 3 and 4.
As can be seen from the cross-section through the composite contact plug 2 in Figs 4 and 5, the radially directed wire lengths 9 and support tongue 10 are located within a notional cylindrical region 11 shown by dotted lines This may, for example, be a socket defined by the bore of a bushing 12 of an electrical connecting lead such as is indicated schematically by dotted lines in Fig 3 where bushing 12 is located in a virtually tolerance-free manner in a cylindrical recess 3 of sleeve member 1 and forms with the two wire lengths 9 of composite contact plug 2 a reliable electrical connection, which also ensures a good protection against electric shocks.
For the manufacture of the welding sleeve of Fig 1, there is first produced a supporting body 5 with the integrally formed support tongues 10, e g by injection moulding in a mould Simultaneously, a slotted circular recess wall member 15 is formed, extending around support 10 This wall member 15 has two diametrically opposite guide slots 16, which are somewhat wider than the thickness of resistancce heating wire 6 and which extend to the bottom of the recess 3 Slots 16 serve to prevent displacement of the end of wire 6 in the direction of the sleeve axis 17 and also to prevent the loop 8 from sliding off top of the support tongue 10 By virtue of the alternative construction of support tongue 10 shown in Fig 5, any sliding off of the loop 8 is made even more difficult, because the support tongue 10 is constructed with a guide groove 18 for each of the wire lengths 9 of loop 8.
Following the production of sleeve supporting body 5, the resistance heating wire 6 is wound onto the outside thereof in axially spaced coils, whereby prior to the start of winding of wire 6 the loop 8 is secured by a bushing 12 At the end of the winding process bushing 12 is removed and sleeve outer part 7 is shaped on, using a mould ( 11 i 1,603,169 which has a portion which corresponds to bushing 12 and projects into the respective recess 3 and prevents the ingress of material of the outer sleeve part 7 into the recess 3.
The moulding of outer sleeve part 7 will then close the slots 16 and embed the resistance heating wire 6 If the wall member 15 does not extend up to the external diameter of sleeve member 1, in the way it does in Fig 3, it is covered by the material of the outer sleeve part 7.
As can be seen from Fig 3, the floor of recess 3 and an annular portion 19 which extends around the wall member 15 can be positioned lower than the external diameter of supporting body 5 Thus, the support tongue 10 can be made sufficiently long, without thereby modifying the good protection against electric shocks.
In principle, the end of resistance heating wire 6 can be guided around support tongue in a fashion other than in loop 8 The essential point is that the composite contact plug 2 includes a support tongue 10 around or over which is placed a portion of the end section of wire 6.
In place of contact plug 2, a socket in the form of a bushing well can be formed in the sleeve member 1 The resistance heating wire 6 is then supported by the inner side wall of the bushing well which has wall slots.
This wall thus serves as the support member for the contact-defining loop position of the wire A contact plug on the conductor lead will in this case be used for securing the end of wire 6 during the winding operation (in place of the bushing 12 used in the above described winding method for the embodiment of Figures 1 to 5) Generally, practical reasons decide whether the electrical connection means in the welding sleeve is formed as a bushing well (just described) or as a contact plug 2 (as in Figures 1 to 5).
Both constructions ensure a simple and reliable electrical connection in that a support member i e the support tongue 10 or the inside face of the side wall of the bushing, is used on which is placed the end of the resistance heating wire 6.
Sleeve member 1 may also be constructed in one part, but use can still be made of the described construction of the electrical connection In this case, the supporting body 5 and outer sleeve part 7 form a one-part tubular member and support tongue 10 can be provided as a separate insert, as indicated by dotted lines in Fig 3 on the bottom of recess 3.

Claims (24)

WHAT WE CLAIM IS:-

1 A method of forming a plastics welding muff comprising forming a first plastics sleeve member with at least one outwardly extending wall defining a recess, locating a resistance heating wire helically along a surface of said first sleeve member with a U-shaped loop exposed within said recess and supported within said recess to form electrical connection means to co-operate with complementary connection means, and forming a second plastics sleeve member 70 coaxially around or within the first sleeve member, to embed the helically wound wire, the U having its axis of symmetry extending radially of said sleeve.

2 A method according to claim 1, 75 wherein the U-shaped wire loop is supported on said recess-defining wall of the first sleeve member.

3 A method according to claim 2, wherein the wire is held supported within 80 the recess during winding of the wire and formation of the second sleeve member by a bushing.

4 A method according to claim 1 wherein the U-shaped wire loop is sup 85 ported on a projection on the first sleeve member within said recess.

A method according to claim 4 wherein the first sleeve member is the inner member, said recess-definihg wall does not 90 extend to the exterior of said second, outer sleeve member to surround said projection, and said recess is continued through said second, outer sleeve member.

6 A method according to claim 4 95 wherein said wall defining the recess surrounding the projection is formed on the first member, which is the inner member, the wall of the recess having at least one slot to receive and guide the wire 100

7 A method according to claim 6 wherein the outer sleeve member extends into the slot outwardly of the wire therein.

8 A method according to any one of claims 4 to 7 wherein the wire is held on the 105 projection during winding of the wire and formation of the second sleeve member by a bushing.

9 A method of forming a welding muff, substantially as hereinbefore described with 110 reference to the accompanying drawing.

A welding muff made by a method according to any preceding claim.

11 An electric welding muff comprising an insulating thermoplastic sleeve extending 115 along a longitudinal axis, a helically wound resistance heating wire embedded in said sleeve about said axis, means for forming a first electrical connection to said wire, and means for forming a second electrical con 120 nection to said wire, wherein said means for forming a first electrical connection to said wire comprises: a recess formed in said sleeve; a support member at said recess and extending radially relative to said sleeve; 125 and a contact-defining portion of said wire forming in a U-shaped loop which is exposed in said recess and coupled to and supported by said support member to permit said wire to contact complementary 130 1,603,169 connection means coupled to an electrical source of energy, the U having its axis of symmetry extending radially of said sleeve.

12 A welding muff according to claim 11, wherein said U-shaped loop is substantially in a plane which is perpendicular to said axis 1

13 A welding muff acccrding to claim 11 or 12, wherein said support member has grooves therein in which said loop is received.

14 A welding muff according to claim 13, wherein said support member comprises a tongue having faces parallel to said longitudinal axis to which said loop is coupled.

A welding muff according to claim 13, wherein said recess is defined by a surrounding wall which serves as said support member, said surrounding wall having oppositely directed guide slots through which said heating wire extends to fix it in position.

16 A welding muff according to claim 15, wherein said support member is wider than said slots in a direction parallel to said longitudinal axis.

17 A welding muff according to claim 16, wherein said sleeve comprises an inner portion and an outer portion; wherein said recess, said wall and said guide slots are on said inner portion; and wherein said outer portion fills said guide slots after said heating wire has been located therein to fix positively said loop in position.

18 An electric welding muff according to any one of claims 11 to 17, wherein said support member is a unitary portion of said sleeve.

19 An electric welding muff according to any one of claims 11 to 18, wherein said means forming a second electrical connection comprises: a second recess formed in said sleeve; a second support member mounted in said second recess and extending radially relative to said sleeve; and a second portion of said wire formed in a U-shaped loop which is exposed in said second recess and coupled to said second support member, the second U having its axis of symmetry radial to said sleeve.

An electric welding muff constructed and adapted to operate substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawing.

21 A welding muff according to any one of claims 11 to 16, wherein said thermoplastic sleeve has inner and outer sleeve members between which the wire is embedded.

22 A welding muff according to claim 21 when appendant to claim 14, wherein said tongue is on the inner sleeve member.

23 A welding muff according to claim 22 wherein the inner sleeve member has a projecting wall defining the recess around the said tongue.

24 A welding muff according to claim 15, 16 or 17, wherein said slots are diametrically opposed 70 A welding muff constructed and arranged substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
J.A KEMP & CO, 75 Chartered Patent Agents, 14, South Square, Gray’s Inn, London WC 1 R 5 EU.
Printed for Her Majesty’s Stationery Office, by Croydon Printing Company Limited, Croydon, Surrey, 1981.
Published by The Patent Office, 25 Southampton Buildings, London, WC 2 A l AY, from which copies may be obtained.

GB24850/78A
1977-06-03
1978-05-31
Electrically welding plastic sleeve

Expired

GB1603169A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

CH689077A

CH622870A5
(en)

1977-06-03
1977-06-03

Publications (1)

Publication Number
Publication Date

GB1603169A
true

GB1603169A
(en)

1981-11-18

Family
ID=4316669
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB24850/78A
Expired

GB1603169A
(en)

1977-06-03
1978-05-31
Electrically welding plastic sleeve

Country Status (10)

Country
Link

US
(1)

US4224505A
(en)

AT
(1)

AT358886B
(en)

BE
(1)

BE867723A
(en)

CH
(1)

CH622870A5
(en)

DE
(1)

DE2823455B2
(en)

FR
(1)

FR2392796A1
(en)

GB
(1)

GB1603169A
(en)

IT
(1)

IT1095029B
(en)

NL
(1)

NL190318C
(en)

SE
(1)

SE441774B
(en)

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US4956138A
(en)

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1990-09-11
Glynwed Tubes And Fittings Limited
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CH630162A5
(en)

1978-05-02
1982-05-28
Werner Sturm

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CH631252A5
(en)

1978-05-29
1982-07-30
Werner Sturm

METHOD AND DEVICE FOR PRODUCING AN ELECTRIC WELDING SLEEVE FROM A THERMOPLASTIC.

US4313053A
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1980-01-02
1982-01-26
Von Roll A.G.
Welding sleeve of thermoplastic material

US4530520A
(en)

1980-03-13
1985-07-23
Von Roll Ag
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(en)

1980-08-29
1985-03-15
Werner Sturm

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(en)

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1984-08-30
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1981-10-19
1985-04-23
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DE3204681C2
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1986-02-06
Friedrichsfeld Gmbh, Steinzeug- Und Kunststoffwerke, 6800 Mannheim

Method and device for embedding an electrical heating wire in a sleeve-like plastic part

CH658426A5
(en)

1983-02-04
1986-11-14
Fischer Ag Georg

METHOD FOR WELDING LINE ELEMENTS FROM THERMOPLASTIC MATERIAL AND A DEVICE SUITABLE FOR THIS.

US4713129A
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1983-08-19
1987-12-15
Central Plastics Company
Plastic pile protector and method of covering a pile with same

US4708527A
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1983-08-19
1987-11-24
Central Plastics Company
Plastic pile protector and method of covering a pile with same

MC1581A1
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1983-12-02
1985-02-04
Toutelectric

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NL8400816A
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1984-03-14
1985-10-01
Wavin Bv

METHOD FOR MANUFACTURING TUBE MUFF AND FITTINGS, AND APPARATUS FOR CARRYING OUT THIS METHOD AND TUBE SOCKET OR FITTING MADE ACCORDING TO THIS METHOD

DE3411179C1
(en)

1984-03-27
1986-01-16
Friedrichsfeld Gmbh, Steinzeug- Und Kunststoffwerke, 6800 Mannheim
Electrical welding fitting or welding collar

EP0171450A1
(en)

1984-08-14
1986-02-19
Österreichische Salen-Kunststoffwerk Gesellschaft m.b.H.
Connection for plastic pipes and method of manufacture

DE3523014C1
(en)

1985-06-27
1987-01-02
Friedrichsfeld Gmbh
Electrical welding fitting or welding collar

DE3540193C1
(en)

1985-11-13
1987-04-23
Friedrichsfeld Gmbh

Electric welding fitting or welding socket

US4852914A
(en)

1987-06-19
1989-08-01
Milfuse Systems, Inc.
Plastic pipeline having rapidly fusible joints and method of making same

US4906313A
(en)

1988-05-09
1990-03-06
R. W. Lyall & Company, Inc.
Fusion weld method and assembly for forming a fusion welded joint between pipe sections

CA1321626C
(en)

1988-07-21
1993-08-24
Naotake Uda
Electrofusion of electrofusion joint, method of confirming state of fusion and fusion joint suitable for use in the methods

DE4214279C2
(en)

1992-04-30
1995-05-24
Hansen Rolf Polymelt Gmbh

Connection element for welding pipes

DE4332194C1
(en)

1993-09-22
1994-12-01
Fischer Georg Rohrleitung
Method for producing a plastic moulding, and mouldings

GB9406591D0
(en)

1994-03-31
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patent/CH622870A5/de
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1978

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DE
DE2823455A
patent/DE2823455B2/en
active
Granted

1978-05-30
FR
FR7816072A
patent/FR2392796A1/en
active
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1978-05-31
IT
IT24099/78A
patent/IT1095029B/en
active

1978-05-31
US
US05/911,091
patent/US4224505A/en
not_active
Expired – Lifetime

1978-05-31
NL
NLAANVRAGE7805912,A
patent/NL190318C/en
not_active
IP Right Cessation

1978-05-31
GB
GB24850/78A
patent/GB1603169A/en
not_active
Expired

1978-06-01
BE
BE188253A
patent/BE867723A/en
not_active
IP Right Cessation

1978-06-01
SE
SE7806430A
patent/SE441774B/en
not_active
IP Right Cessation

1978-06-01
AT
AT396878A
patent/AT358886B/en
not_active
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1987-08-17
1990-09-11
Glynwed Tubes And Fittings Limited
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Method of manufacturing an electrofusion coupler

Also Published As

Publication number
Publication date

SE7806430L
(en)

1978-12-04

CH622870A5
(en)

1981-04-30

DE2823455C3
(en)

1988-02-11

DE2823455B2
(en)

1980-10-30

BE867723A
(en)

1978-10-02

NL190318C
(en)

1994-01-17

DE2823455A1
(en)

1978-12-14

SE441774B
(en)

1985-11-04

FR2392796A1
(en)

1978-12-29

FR2392796B1
(en)

1982-08-06

AT358886B
(en)

1980-10-10

IT7824099D0
(en)

1978-05-31

US4224505A
(en)

1980-09-23

NL190318B
(en)

1993-08-16

NL7805912A
(en)

1978-12-05

IT1095029B
(en)

1985-08-10

ATA396878A
(en)

1980-02-15

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