EP0820118A2 - Fiche pour éléments de liaison thermoplastiques électrosoudables - Google Patents

Fiche pour éléments de liaison thermoplastiques électrosoudables Download PDF

Info

Publication number: EP0820118A2
Authority: EP; European Patent Office
Prior art keywords: plug; resistance wire; contact; plug contact; base
Prior art date: 1996-07-15
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.): Granted

Application number

EP97810470A

Other languages

German (de)

English (en)

Other versions

EP0820118B1 (fr

EP0820118A3 (fr

Inventor

Max Meier

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.)

Wavin BV

Original Assignee

Wavin BV

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.)

1996-07-15

Filing date

1997-07-11

Publication date

1998-01-21

1997-07-11 Application filed by Wavin BV filed Critical Wavin BV

1998-01-21 Publication of EP0820118A2 publication Critical patent/EP0820118A2/fr

1999-10-20 Publication of EP0820118A3 publication Critical patent/EP0820118A3/fr

2002-10-23 Application granted granted Critical

2002-10-23 Publication of EP0820118B1 publication Critical patent/EP0820118B1/fr

2017-07-11 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
- H01R4/2416—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type
- H01R4/242—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members being plates having a single slot

Definitions

the present invention relates to a method for producing a contacting connection in a molded plastic part, in particular an electrowelding connecting element, between an electrically conductive plug contact element and a resistance wire surrounded by an insulation layer according to the preamble of claim 5.
Thermoplastic electro-welding connecting elements for example electric welding sleeves or tapping saddles, are used to connect pipes made of thermoplastic material, the welded connection being created using a built-in heating coil made of resistance wire.
a circuit is closed via the resistance wire so that the heat generated leads to the heating of the material at the boundary zones of the electrical welding connection element and the pipe or pipe part.
the required welding energy is supplied by an external welding device, which is connected to the electrical welding connection element. Means must therefore be provided to contact the ends of the resistance wire.
CH-A-622'870 discloses a plug connection for contacting the resistance wire of a welding sleeve.
the welding sleeve has two plug receptacles in the form of recesses.
a plastic support body is formed, over which and along the vertical flanks one end of the resistance wire is held in the form of a loop.
the support body and the loop of the resistance wire together form a contact pin, on which a socket can be inserted.
the resistance wire In order for an electrical contact to take place, the resistance wire must be stripped beforehand.
DE-A-43'32'194 discloses a method for producing a contacting connection in a welding sleeve between a resistance wire and a plug contact element, which serves as a contact pin.
Two plug-in contact receptacles are arranged on the welding sleeve in the form of recesses, in each of which a projection is formed.
One end of each resistance wire is placed on a projection, the wire being held in slots on both sides of the recess.
the associated plug contact element has a clamping slot, the width of which is smaller than the diameter of the bare resistance wire.
This plug contact element is inserted into the recess, as a result of which the resistance wire is pressed over the projection and is clamped and cut in the clamping slot of the plug contact element. This creates the desired contact, cutting through any plastic sheathing of the resistance wire.
EP-A-0'563'409 describes an electrical plug contact connection in order to contact a resistance wire with a plug contact element in the form of a flat plug.
the contact is made via a conductive anvil, which is on the tab is molded and over which the resistance wire is placed.
the resistance wire is in turn stripped by means of an insulation displacement contact by cutting through the insulation sheath.
thin resistance wires in particular with diameters of 0.1 to 0.5 mm, are to be preferred, since the shrinkage of the plastic part to be welded is less hindered thereby.
the contacting connection between a thin coated or lacquered resistance wire and a plug contact element is difficult to establish, since the insulation layer can hardly be removed from the resistance wire without damaging it.
the method according to the invention eliminates the need to remove the insulation layer beforehand.
the insulation layer of the resistance wire is destroyed by surface pressure on both sides of the opening of the plug contact socket, in particular melted away. On the one hand, this creates an electrical contact. On the other hand, since there is no mechanical treatment, the bare wire is not injured.
the surface pressure required to destroy the insulation layer is achieved in that the contact surfaces of the plug-in contact element are essentially reduced to the edge regions of the plug-in element legs, which form the clamping regions, due to the depression present between the plug element legs.
the resistance wire is arranged in the area of the depression without pressure.
the depression has the shape of a blind hole.
the shape of the depression can be selected as desired, for example the depression may have the shape of a groove or groove which extends between the plug element legs in the direction of the resistance wire to be received.
the mutually facing inner surfaces of the plug element legs consist of flat surfaces. In another embodiment, they are concave surfaces, wherein they preferably form a common circular cylinder which is pierced by the slot.
the lateral surfaces of the plug element legs form a common circular cylinder with a slot or they are conical in shape and form a truncated cone tapering towards the plug contact base.
the conical shape has that Advantage that the insertion into the plug contact base is facilitated and the thickness of the plug element legs can thus be reduced.
the plug-in contact element when the plug-in contact element is inserted into the recess in the plug-in contact base, it is ensured that no strong tensile forces act on the resistance wire and that it remains in its predefined position as far as possible in rest. Since part of the resistance wire is generally pulled into the recess when it is inserted, there is a risk that the resistance wire will be bent and broken over the edges of the plug contact socket. To avoid this, the resistance wire protruding into the recess of the plug contact base is supported during the creation of the plug contact. For this purpose, a non-conductive anti-slip device is arranged in the recess of the plug contact base, which prevents the resistance wire from slipping further. The resistance wire lies on the anti-slip device without pressure.
a cavity is formed between the plug contact element and the anti-slip device when plugged together.
this is achieved in that the upper surface of the anti-slip device is arranged lower than a surface of the plug-in contact base which serves as a wire support surface.
the depression in the plug contact element has the shape of a blind hole, which comes to lie over the anti-slip device.
the plug contact element has a flange which is plugged together Condition comes to rest on the wire contact surface of the plug contact socket.
location and directional information are used which relate only to the alignment of the tapping clamp shown in the figures and do not necessarily have to correspond to the installation position on site.
FIG. 1 shows a plug contact socket 1 made of plastic, which is molded onto an electrowelding connecting element, here a thermoplastic, electrically weldable tapping clamp.
an electrowelding connection element has two such plug-in contact sockets, which each receive one end of a resistance wire 4 embedded in the body of the electrowelding connection element.
the production of such a plug contact base 1 on a plastic molded part is known and can be produced, for example, by injection molding.
the processing of the tapping clamp or electrofusion socket after the plug contact has been created is also known.
the plug-in contact base 1 has a circumferential, vertically standing edge 10 which has a vertically extending wire guide slot 13, which is visible in FIG. 5, at two diagonally opposite points.
the surface of the plug-in contact socket 1 which is aligned with the bottom of the wire guide slots serves as a wire contact surface 14.
a recess in the form of a plug-in element receptacle 11 is arranged in the plug-in contact socket 1.
This plug element receptacle 11 has a circumferential annular shoulder 12 in the upper region.
An anti-slip device 15 is formed in the plug-in element receptacle 11, here in the form of a free-standing base. In this embodiment, the upper surface of the anti-slip device 15 is arranged lower than the wire contact surface 14. In addition, it is located in the middle of the recess, whereby the plug element receptacle 11 has the shape of an annular groove.
FIGS. 2 and 3 show a metallic plug contact element 2 which can be inserted into the plug contact socket 1. It comprises a contact pin 20 for establishing a connection to a socket (not shown here) of a welding device cable and two plug element legs 22 for insertion into the plug element receptacle 11.
the contact pin 20 and the plug element leg 22 are connected to one another via a contact flange 21 .
the plug element legs 22 are separated from one another by a slot 23 which widens towards the lower end, the slot 23 in this embodiment extending as far as the contact flange 21.
the width of the slot at its narrowest point is equal to or slightly larger than the diameter of the resistance wire 4 to be clamped minus the thickness of its insulation layer.
the plug contact element 2 In the plug contact element 2, more precisely between the plug element legs 22, there is a depression, here in the form of a centered blind hole 24, which projects into the contact flanges 21. Because of this blind hole, the inner surfaces of the plug-in element legs 22 have a concave shape, forming a common circular cylinder which is broken through by the slot 23. In another embodiment, not shown here, the depression is arranged only in the upper region of the plug element legs 22, for example in the form of a groove or groove, so that the inner surfaces of the plug element leg are flat surfaces.
the diameter of the blind hole 24 preferably corresponds at least to the diameter of the anti-slip device 15.
the upper part of the blind hole 24 and the anti-slip device 15 form a cavity 3, the height of which corresponds at least to the diameter of an inserted resistance wire.
FIGS. 4 and 5 show plug-in contact base 1 and plug-in contact element 2 in the assembled state with inserted resistance wire 4 and contacting plug-in contact element 2. These elements together form a plug connection into which a plug of a welding device connecting cable can be inserted.
a section usually an end of the resistance wire 4 surrounded by an insulation layer, is pressed into the wire guide slots 13 of the plug contact socket 1 and thus placed over the recess of the plug contact socket 1, whereby it rests on the wire contact surface 14. It is noted that as far as possible no tension is exerted on the resistance wire 4.
the plug contact element 2 is then inserted into the plug contact base 1, care being taken that the plug element slot 23 comes to lie in a straight line between the two wire guide slots 13.
the plug element legs 22 are received in the plug element receptacle 11 and the contact flange 21 lies on the plug contact base 1, more precisely on the wire contact surface 14. Since the common diameter of the plug element legs 22 is slightly larger than that of the plug element receptacle 11, the plastic part is slightly deformed or the plug contact element at least partially cuts into the recess.
the annular shoulder 12 in the plug element receptacle 11 facilitates the deformation on the side remote from the anti-slip device 15, so that there is generally a lateral distance between the plug element legs 22 and the anti-slip device 15.
the resistance wire 4 is encompassed by the plug element slot 23, wherein it is clamped between the outer edges of the plug element receptacle 11 and the plug element leg 22, but is received without pressure in the region of the depression.
the clamping areas in which pressure is exerted on the resistance wire are thus reduced to the edge area of the plug element legs 22.
the surface pressure achieved is sufficiently large that the insulation layer of the resistance wire is melted away and an electrically conductive contact between the plug contact element 2 and the resistance wire 4 is produced.
the resistance wire 4 is partially pulled too far into the plug element receptacle 11.
the anti-slip device 15 prevents the resistance wire from breaking off over the edge of the plug element receptacle by supporting it.
the cavity 3, which is formed by the anti-slip device 15 and the blind hole 24, creates a compensation space for the excess part of the resistance wire, which was drawn into the plug element receptacle 11 when it was inserted. This prevents the resistance wire from being kinked and damaged in the area of the anti-slip device 15.
FIGS. 6 and 7 show a further exemplary embodiment of the subject matter of the invention.
the plug contact base 1 and the associated plug contact element 2 have essentially the same shape as the exemplary embodiment described with reference to FIGS. 1 to 5.
the plug element legs 22 have a conical cross section and form a truncated cone tapering towards the receptacle 11 of the plug contact base 1.
the plug element holder 11 also has the shape of a truncated cone. This facilitates the insertion of the plug element into the plug contact socket.
the plug element legs can have a relatively small thickness, so that they are weakened and are held in a spring-loaded manner in the plug element receptacle.
plug contact element 2 with a round cross section and a correspondingly shaped plug contact receptacle 1 have been described in these embodiments, the cross section can have any shape.
an embodiment not shown here has a plug-in element receptacle without an anti-slip device arranged therein.

Landscapes

Manufacturing Of Electrical Connectors (AREA)
Lining Or Joining Of Plastics Or The Like (AREA)
Branch Pipes, Bends, And The Like (AREA)

EP97810470A 1996-07-15 1997-07-11 Fiche pour éléments de liaison thermoplastiques électrosoudables Expired - Lifetime EP0820118B1 (fr)

Applications Claiming Priority (3)

Application Number	Priority Date	Filing Date	Title
CH1773/96		1996-07-15
CH01773/96A CH690052A5 (de)	1996-07-15	1996-07-15	Steckkontakt für thermoplastische Elektroschweiss- Verbindungselemente.
CH177396		1996-07-15

Publications (3)

Publication Number	Publication Date
EP0820118A2 true EP0820118A2 (fr)	1998-01-21
EP0820118A3 EP0820118A3 (fr)	1999-10-20
EP0820118B1 EP0820118B1 (fr)	2002-10-23

Family

ID=4218275

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP97810470A Expired - Lifetime EP0820118B1 (fr)	1996-07-15	1997-07-11	Fiche pour éléments de liaison thermoplastiques électrosoudables

Country Status (3)

Country	Link
EP (1)	EP0820118B1 (fr)
CH (1)	CH690052A5 (fr)
DE (1)	DE59708542D1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CH622870A5 (fr) *	1977-06-03	1981-04-30	Werner Sturm
GB2022939B (en) *	1978-05-26	1982-10-20	Lucas Industries Ltd	Electrical terminal assembly
DE59200023D1 (de) *	1992-03-27	1993-12-16	Siemens Ag	Elektrische Steckkontakt-Verbindung.
DE4332194C1 (de) *	1993-09-22	1994-12-01	Fischer Georg Rohrleitung	Verfahren zum Herstellen eines Kunststofformteils und Formteile

1996
- 1996-07-15 CH CH01773/96A patent/CH690052A5/de not_active IP Right Cessation
1997
- 1997-07-11 DE DE59708542T patent/DE59708542D1/de not_active Expired - Lifetime
- 1997-07-11 EP EP97810470A patent/EP0820118B1/fr not_active Expired - Lifetime

Also Published As

Publication number	Publication date
EP0820118B1 (fr)	2002-10-23
DE59708542D1 (de)	2002-11-28
EP0820118A3 (fr)	1999-10-20
CH690052A5 (de)	2000-03-31

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