DE2656850C2 - Elektrisch heizbare Schweißmuffe und Verfahren zu deren Herstellung - Google Patents

Elektrisch heizbare Schweißmuffe und Verfahren zu deren Herstellung

Info

Publication number
DE2656850C2
DE2656850C2 DE2656850A DE2656850A DE2656850C2 DE 2656850 C2 DE2656850 C2 DE 2656850C2 DE 2656850 A DE2656850 A DE 2656850A DE 2656850 A DE2656850 A DE 2656850A DE 2656850 C2 DE2656850 C2 DE 2656850C2
Authority
DE
Germany
Prior art keywords
socket
sleeve
welding
wall
electrically heatable
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
DE2656850A
Other languages
English (en)
Other versions
DE2656850A1 (de
Inventor
Paul Jona Stähli
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.)
Geberit AG
Original Assignee
Geberit 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.)
Filing date
Publication date
Application filed by Geberit AG filed Critical Geberit AG
Publication of DE2656850A1 publication Critical patent/DE2656850A1/de
Application granted granted Critical
Publication of DE2656850C2 publication Critical patent/DE2656850C2/de
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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91218—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods using colour change, e.g. using separate colour indicators
    • 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
    • B29C65/34—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"
    • B29C65/3472—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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • 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
    • B29C66/50—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
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91221—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the parts to be joined
    • 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
    • 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"
    • B29C65/3468—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
    • 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
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Description

15
20
Die Erfindung betrifft eine elektrisch heizbare Schweißmuffe aus thermoplastischem Material zum Verbinden von Kunststoffrohren, mit einer Wandung der Muffe angeordneten. Heizdrahtwicklung, deren Enden zur Außenseite der Muffe geführt sind
Zwischen den Kunststoffrohren und den sie zu verbinden bestimmten Muffen bestehen relativ große, herstellungsbedingte Toleranzunterschiede. Falls die ToIeranzen zu eng gehalten werden, kann es vorkommen, daß einzelne Rohr nur mit Mühe, z. B. durch Einschlagen, in die Muffe einsetzbar ijnd, wa.-, nachteilig ist. Bei zu weiten Toleranzen sind die Rohre in der Muffe nicht zentriert und können leicht verkanten, was zu schlechten Schweißverbindungen führt. Auch beim Zusammenbau eines Rohrsystems wäre es vorteilhaft, wenn die Rohre vor dem Verschweißen satt in den Muffen sitzen würden und genau fluchtend durch letztere gehalten wären. Es ist nun Aufgabe der Erfindung, eine Schweißmuffe der eingangs erwähnten Art 10 weiterzubilden, daß ein einwandfreier Zusammenbau von Rohren und Muffe möglich ist.
Erfindungsgemäß wird dies so erreicht, daß die Innenwand der Muffe federnde Vorsprünge aufweist.
Bei einer vorteilhaften Ausführungsform der Schweißmuffe bestehen die Vorsprünge aus in axialer Richtung sich erstreckenden Lappen, die in gleichmäßigen Abständen voneinander angeordnet sind.
Die Erfindung betrifft auch ein Verfahren zur Herstellung der Schweißmuffe, welches erfindungsgemäß dadurch gekennzeichnet ist, daß zur Bildung der Vorsprünge Längsfurchen eingestochen werden.
Nachfolgend wird anhand der Zeichnung ein Ausführungsbeispiel einer Schweißmuffe näher erläutert. Es zeigt
Fig. 1 einen Längsschnitt durch eine Schweißmuffe und
Fig. 2 einen Radialschnitt durch die Wand der Schweißmuffe in größerem Maßstab.
Die in der F i g. 1 dargestellte, elektrisch heizbare Schweißmuffe weist einen zylindrischen Körper 1 aus einem thermoplastischen Kunststoff, beispielsweise Polyäthylen, auf. Die Innenwand 2 des Körpers ist mit einer schraubenlinienförmigen Nut 3 versehen, in welehe die Wicklung 4 eines Heizdrahtes eingelegt ist. Die Enden des Heizdrahtes sind durch zwei radiale Bohrungen 5 nach außen geführt und mit zwei im Körper verankerten Kontaktstücken 6 verbunden, welche ihrerseits durchzwS Buchsen 7 abgeschirmt sind.
Die Herstellung der- Muffe erfolgt mit relativ engen Toleranzen. Demgegenüber weisen die meist durch Extrusion hergestellten Kunststoff rohre relativ groß? Durchmesserunterschiede aus, was das Aufschieben der Muffe auf die Enden der Rohre erschwert, falls die Passung zu eng ist, oder zu einer zu losen Verbindung vor dem Verschweißen führt, falls die Passung zu we's ist Dadurch wird der Zusammenbau einzelner Rohre zu einem Rohrsystem erschwert; die Rohre sind in den Muffen nicht zentriert, und die Verschweißung ist ungleichmäßig. Um dies zu verhindern, werden Längsfurchen 8 in die Innenwand 2 des Muffenkörpers 1 derart eingestochen, daß das aus den Furchen verdrängte Material nach innen vorsteht und Längslappen 9 bildet. Die Tiefe der Furche 8 wird selbstverständlich so gewählt, daß der in den Nuten 3 eingelegte Widerstandsdraht 4 nicht verletzt wird. Die Furchen werden zweckmäßigerweise so gezogen, daß die Lappen 9 in gleichmäßigen Abständen an der Innenwand angeordnet sind.
Durch diese Lappen werden die in die Muffe beidseitig bis zum Anschlagring 10 eingeschobenen Rohre 11 mit sattem Sitz und genau zentriert gehalten. Der Abstand der Rohre von der Innenwand der Muffe ist gleichmäßig, was eine bessere Schweißverbindung gewährleistet. Versuche haben gezeigt, daß die Lappen genügend elastisch sind, um auch nach mehrmaligem Überschieben der Muffe einen festen Halt der Verbindung zu bewirken.
Zur Herstellung der unlösbaren Verbindung wird in bekannter Weise durch den Heizdraht erwärmt, was eine Schrumpfung derselben und ein Verschweißen der Innenwand mit den Rohrenden bewirkt.
Hierzu 1 Blatt Zeichnungen

Claims (3)

Patentansprüche:
1. Elektrisch heizbare Schweißmuffe aus thermoplastischem Material zum Verbinden von Kunststoffrohren, mit einer in der Wandung der Muffe angeordneten Heizdrahtwicklung, deren Enden zur Außenseite der Muffe geführt sind, dadurch gekennzeichnet, daß die Innenwand (2) der Muffe federnde Vorsprünge (9) aufweist
2. Schweißmuffe nach Anspruch 1, dadurch gekennzeichnet, daß die Vorsprünge sich in axialer Richtung erstreckende Lappen (9) sind, die in gleichmäßigen Abständen voneinander angeordnet sind.
3. Verfahren zur Herstellung der Schweißmuffe nach Anspruch 1 und 2, dadurch gekennzeichnet, daß zur Bildung der Vorsprünge Längsfurchen eingestochen werden.
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DE2656850A 1975-12-18 1976-12-15 Elektrisch heizbare Schweißmuffe und Verfahren zu deren Herstellung Expired DE2656850C2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1641675A CH606895A5 (de) 1975-12-18 1975-12-18

Publications (2)

Publication Number Publication Date
DE2656850A1 DE2656850A1 (de) 1977-06-30
DE2656850C2 true DE2656850C2 (de) 1985-04-18

Family

ID=4417181

Family Applications (2)

Application Number Title Priority Date Filing Date
DE7639283U Expired DE7639283U1 (de) 1975-12-18 1976-12-15 Elektrisch heizbare schweissmuffe
DE2656850A Expired DE2656850C2 (de) 1975-12-18 1976-12-15 Elektrisch heizbare Schweißmuffe und Verfahren zu deren Herstellung

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE7639283U Expired DE7639283U1 (de) 1975-12-18 1976-12-15 Elektrisch heizbare schweissmuffe

Country Status (14)

Country Link
US (1) US4147926A (de)
AT (1) AT350342B (de)
BE (1) BE849569A (de)
CA (1) CA1039770A (de)
CH (1) CH606895A5 (de)
DE (2) DE7639283U1 (de)
DK (1) DK571176A (de)
FI (1) FI65482C (de)
FR (1) FR2335325A1 (de)
IT (1) IT1065429B (de)
LU (1) LU76413A1 (de)
NL (1) NL7614100A (de)
NO (1) NO145048C (de)
SE (1) SE7614212L (de)

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CN101988613A (zh) * 2009-07-30 2011-03-23 上海龙胜实业有限公司 一种指示塑胶管件热熔接长度的方法
RU2450202C2 (ru) * 2010-07-19 2012-05-10 Учреждение Российской академии наук Институт проблем нефти и газа Сибирского отделения Российской академии наук Способ муфтовой сварки полимерных труб
RU2458279C2 (ru) * 2010-08-27 2012-08-10 Учреждение Российской академии наук Институт проблем нефти и газа Сибирского отделения Российской академии наук Способ сварки полимерных труб с помощью электромуфт
RU2484962C1 (ru) * 2012-01-10 2013-06-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Казанский государственный энергетический университет" (ФГБОУ ВПО "КГЭУ") Устройство для сварки полимерных трубчатых элементов
WO2013110618A1 (en) 2012-01-23 2013-08-01 Inter Hospitality Holding B.V. Prefabricated panel for a building
EP2617911B1 (de) 2012-01-23 2016-04-20 Vastint Hospitality B.V. Verfahren und System zum Bauen eines Gebäudes
WO2013110617A1 (en) 2012-01-23 2013-08-01 Inter Hospitality Holding B.V. Prefabricated module for a building
GB201204294D0 (en) * 2012-03-12 2012-04-25 Pioneer Lining Technology Ltd Electrofusion fitting
CA154777S (en) 2013-07-22 2015-06-25 Inter Hospitality Holding B V Prefabricated module

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US3212799A (en) * 1962-05-22 1965-10-19 Johns Manville Pipe coupling
US3208757A (en) * 1963-10-23 1965-09-28 Pyramid Ind Inc Joint for plastic pipe
FR1387254A (fr) * 1963-12-18 1965-01-29 Manchon de raccordement de pièces cylindriques
FR1416207A (fr) * 1964-11-30 1965-10-29 American Metal Prod Accouplement de conduites en matière plastique
GB1234783A (en) * 1967-10-10 1971-06-09 Phetco England Ltd Improvements in or relating to connectors for connecting w.c. pans to soil pipes
US3563574A (en) * 1969-01-28 1971-02-16 Certain Teed Prod Corp Coupling for plastic pipe
DE1960466A1 (de) * 1969-12-02 1971-06-09 Hartinger Geb Drautzburg Chris Rohrverbindung an Kunststoffrohren
CH515449A (de) * 1970-09-08 1971-11-15 Rollmaplast Ag Elektrisch schweissbare Rohrmuffe aus Kunststoff mit Berührungsschutz
US3797865A (en) * 1971-02-25 1974-03-19 Palmer Concrete Prod Inc Adapter
BE789145A (fr) * 1971-09-27 1973-01-15 Phone Ducs Troncons de conduit
NL175458C (nl) * 1973-03-14 1984-11-01 Sturm Werner Werkwijze voor het vervaardigen van een lasmof voor thermoplastische buizen.
CH570577A5 (de) * 1974-05-10 1975-12-15 Fischer Ag Georg

Also Published As

Publication number Publication date
FR2335325B3 (de) 1979-08-24
US4147926A (en) 1979-04-03
FI65482C (fi) 1984-05-10
FI763608A (de) 1977-06-19
FI65482B (fi) 1984-01-31
NO145048C (no) 1982-01-04
NL7614100A (nl) 1977-06-21
CH606895A5 (de) 1978-11-15
SE7614212L (sv) 1977-06-19
ATA940776A (de) 1978-10-15
NO764227L (de) 1977-06-21
DK571176A (da) 1977-06-19
CA1039770A (en) 1978-10-03
DE7639283U1 (de) 1977-04-07
LU76413A1 (de) 1977-06-10
AT350342B (de) 1979-05-25
FR2335325A1 (fr) 1977-07-15
BE849569A (fr) 1977-04-15
NO145048B (no) 1981-09-21
DE2656850A1 (de) 1977-06-30
IT1065429B (it) 1985-02-25

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