EP0494438B1 - Vorrichtung für den Anschluss eines Kabelendes - Google Patents

Vorrichtung für den Anschluss eines Kabelendes Download PDF

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Publication number
EP0494438B1
EP0494438B1 EP91122139A EP91122139A EP0494438B1 EP 0494438 B1 EP0494438 B1 EP 0494438B1 EP 91122139 A EP91122139 A EP 91122139A EP 91122139 A EP91122139 A EP 91122139A EP 0494438 B1 EP0494438 B1 EP 0494438B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
cable
cable end
terminal contact
contact
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 - Lifetime
Application number
EP91122139A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0494438A2 (de
EP0494438A3 (en
Inventor
Wolfgang B. THÖRNER
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.)
Individual
Original Assignee
Individual
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
Priority claimed from DE4100600A external-priority patent/DE4100600A1/de
Application filed by Individual filed Critical Individual
Publication of EP0494438A2 publication Critical patent/EP0494438A2/de
Publication of EP0494438A3 publication Critical patent/EP0494438A3/de
Application granted granted Critical
Publication of EP0494438B1 publication Critical patent/EP0494438B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0521—Connection to outer conductor by action of a nut
    • 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
    • H01R4/28—Clamped connections, spring connections
    • H01R4/50—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw
    • H01R4/5033—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw using wedge or pin penetrating into the end of a wire in axial direction of the wire

Definitions

  • the invention relates to a device for connecting a cable end cut perpendicular to its longitudinal axis to a plug body, a socket body or an electrical device according to the preamble of claim 1, as is already known from DE-A-2 923 399.
  • Such a device is also known for example from DE-OS 25 10 299.
  • a complex special tool is required to establish the connection in order to press the end of the cable end against the plug body and to hold it in this position.
  • the clamping contact is produced in a subsequent operation by screwing the metal contact sharpened at the front through the plug body into the cable end, which in turn requires a separate screwing tool.
  • the sleeve is pressed over the contact point by means of a hexagonal press.
  • the known device therefore requires several special tools and several successive operations for connection to a cable end.
  • a similar device is also known from DE-GM 79 03 554.
  • a crimpable sleeve forming the strain relief is entirely missing. Instead, radial pressure forces are exerted on the outer insulation of the cable end by means of the housing halves of the plug body.
  • the bluntly cut cable end must first be pushed by hand onto the contact or contacts sharpened at the front. Then the halves of the housing must be placed around the cable end and pressed together with great force in order to generate the required radial compressive forces. Care must be taken to ensure that the clamping contacts, which are initially only loosely inserted into the cable end, do not slip out of the cable end before the required compressive stress is generated. If the procedure is not careful, the quality of the clamping contact thus produced leaves something to be desired.
  • the invention proposes, starting from the device of the type mentioned, that the sleeve, together with the cable end located therein, can be pushed axially over the electrical clamping contact by means of the screw thread of a union nut, and the cable end radially in the region of the axially penetrating clamping contact is pressed together.
  • the device according to the invention is characterized primarily by a particularly simple assembly without any special tools.
  • the sleeve is pushed onto the blunt cut cable end from the front and then pushed together with the cable end axially over the electrical clamp contacts.
  • the large force in the axial direction required for this slide-on operation is generated exclusively with the screw thread of the union nut.
  • the clamp contact which is sharpened at the front, penetrates into the stranded wire of the cable end and makes electrical contact with it.
  • the terminal contact penetrates, the insulating material of the cable is displaced radially outwards. This creates a radial compressive stress inside the sleeve.
  • a particular advantage is that the electrical contact is made within the insulation, which is under high radial compressive stress, so that the contact points are largely hermetically sealed by the insulating material.
  • the electrical contacts produced in this way are sealed particularly securely against corrosive environmental influences, so that contact errors caused by contact corrosion are reliably and permanently avoided.
  • the sleeve In order to facilitate the radial deformability of the sleeve, it can be provided with one or more longitudinal slots or consist of a correspondingly deformable material.
  • the inside of the sleeve serving as strain relief is expediently provided with a profile which increases the friction between the sleeve and the outer insulation of the cable. Such profiling is pressed into the outer insulation from the outside and in this way increases the frictional contact between the sleeve and the cable considerably, which further increases the mechanical strength of the strain relief.
  • the clamp contact which is sharpened at the front, is expediently designed as a mandrel which is provided on the outside with a sawtooth profile.
  • This sawtooth profiling improves contacting in the area of the conductor strand. This is because, at least in the area of the sawtooth tips, it produces good galvanic contacts to the wires of the conductor strand.
  • the clamping contact for the inner conductor strand is expediently designed as a mandrel and the clamping contact for the outer conductor as a knife contact concentrically surrounding the mandrel, the diameter of which corresponds to the diameter of the outer conductor.
  • the device can advantageously be used for coaxial cables in which the connection is normally particularly labor-intensive because of the large number of contacts to be produced.
  • the assembly effort for the connection to the end of a coaxial cable is in no way different from the assembly effort for a normal, single-stranded cable.
  • the pointed end of the mandrel projects beyond the sharpened end of the knife contact. This simplifies the insertion of the mandrel into the inner conductor strand and gives the cable end a guide in the longitudinal direction of the knife contact before the knife contact penetrates.
  • a threaded hole running transversely to the coaxial cable is provided in the union nut of the coaxial cable, into which a mandrel screw for contacting the outer conductor of the coaxial cable can be screwed is. If required, this mandrel screw can be used to make electrical contact between the outer outer conductor and the plug body, socket body or housing of the electrical device.
  • the cinch (RCA) connector shown in FIG. 1 is constructed conventionally on the connector side. It consists of a metallic connector body 1, the connector side is provided with an outer ring contact 2 and a contact pin 3, which are electrically separated from each other by an insulating sleeve 4.
  • the outer ring contact 2 is conical on its outside and divided into several tongues by longitudinal slots, not shown in the drawing, which can be compressed in the manner of a collet mechanism.
  • a support ring 5 is used, which bears from the outside on the conical surface of the outer ring contact 2 and is rotatably and non-rotatably mounted at the front end of a jacket sleeve surrounding the plug body 1 and is axially adjustable together with it.
  • the coaxial cable 11 has an inner conductor 12 consisting of a multiplicity of fine wires and a tubular outer conductor 13 which can consist, for example, of a fine wire mesh. Between the inner conductor 12 and the outer conductor 13 there is an insulating layer 14, which consists of a suitable plastic with dielectric properties. On its outside, the outer conductor 13 is surrounded by an outer insulation 15, which is also made of a suitable plastic.
  • An additional outer conductor 13a can optionally be embedded between the outer insulation 15 and the outer conductor 13, which serves to shield magnetic interference fields and can consist of a metal foil suitable for this purpose.
  • connection-side end of the coaxial cable 11 is cut in a section plane running perpendicular to the longitudinal axis of the cable and is surrounded by a sleeve 16 lying on the outer insulation 15, which is provided on its inside with a friction-increasing profile 17 and serves as strain relief.
  • the plug body 1 is provided in the center with a mandrel 18, the longitudinal axis of which coincides with the longitudinal axis of the coaxial cable 11 and the tip of which points in the direction of the coaxial cable 11 to be connected.
  • This mandrel has a sawtooth profile and is electrically conductively connected to the contact pin 3.
  • the mandrel 18 is surrounded at a distance by an annular knife contact 19, the sharpened side of which also faces the coaxial cable 11 to be connected and whose diameter corresponds approximately to the diameter of the outer conductor 13 of the coaxial cable 11.
  • This knife contact 19 is connected to the outer ring contact 2 in an electrically conductive manner.
  • the sleeve 16 serving as strain relief is provided at its front end with a conical surface 16a and lies with its outer surface against an outer support ring 20 which is integrally connected to the plug body 1 and at its rear end a counter-conical surface 20a to the conical surface 16a of the sleeve 16 having. Furthermore, the sleeve 16 is designed to be radially deformable, which can be done either by providing it with one or more longitudinal slots or by manufacturing it from a correspondingly deformable material. The rear end of the sleeve 16 abuts a shoulder 21 of the union nut 9. The union nut 9 is provided with an internal thread 22 which engages in an external thread 23 of the plug body 1.
  • the coaxial cable 11 is first cut smoothly perpendicular to its longitudinal axis. Then the union nut 9 is pushed onto the end of the coaxial cable so that its thread faces forward. Subsequently, the sleeve 16 is pushed over the smoothly cut end of the coaxial cable 11 and advanced together with the coaxial cable 11 so far in the direction of the mandrel / knife contact arrangement 18, 19 that the cone surface 16a of the sleeve 16 abuts the counter-cone surface 20a of the support ring 20. The union nut 9 is then screwed onto the plug body 1.
  • the sleeve 16 When the union nut is screwed onto the plug body 1, the sleeve 16 is pushed with great force over the mandrel / knife contact arrangement 18, 19 by the shoulder 21 of the union nut 9. First, the tip of the mandrel 18 penetrates into the inner conductor strand 12 of the coaxial cable 11 and produces an electrical clamping contact there. In the same way, the knife contact 19 penetrates with its sharpened end in the area of the outer conductor 13 into the end of the coaxial cable 11 and establishes an electrical clamping contact with the outer conductor 13.
  • the sleeve 16 is radially compressed by the axial displacement and the conical surfaces 16a and 20a, so that the end of the coaxial cable 1 located in the sleeve 16 is subjected to a strong compressive stress.
  • This compressive stress increases the intensity of the electrical terminal contacts and hermetically seals the contact points against external influences.
  • the exemplary embodiment according to FIG. 2 shows a banana plug which is constructed conventionally on the plug side.
  • This banana plug is provided on the outer circumference with an insulating grip sleeve 30 which surrounds an inner metallic plug body 31.
  • the plug body 31 contains a metallic contact piece 32, which is connected at its front to the metallic plug pin 33 of the banana plug.
  • This plug pin 33 is hollow and longitudinally formed and can be spread out by means of a spreading mechanism.
  • This expansion mechanism consists of a tension bolt 34 arranged in the interior of the plug pin, which has at its outer end with a conical expansion head 35 and at its plug end cross bolts 36, which bear on screw surfaces 37 of a rotatable sleeve head 38, which is rotatable at the front end of the grip sleeve 30 is stored and how it consists of insulating material.
  • the screw surfaces 37 of the sleeve head 38 are inclined towards the axial direction in such a way that when the sleeve head 38 is rotated, a tensile force is exerted on the tension bolt 34, by means of which the plug pin 33 is spread apart and fixed in its insertion opening.
  • the banana plug according to FIG. 2 is constructed largely similar to the cinch plug shown in FIG. 1.
  • the same reference numerals are therefore used below for the corresponding parts.
  • a union nut 9 is provided, which can be screwed onto the plug body 31 by means of a thread 22, 23 and has an external thread 8 on the outer circumference, onto which the grip sleeve 30 can be screwed.
  • the union nut 9 is also provided here with an opening 10 for the passage of a cable 39, which here only has an internal conductor strand 40 consisting of fine wires.
  • This conductor strand 40 of the cable 39 is surrounded by an outer insulation 41 made of plastic.
  • connection-side end of the cable 39 is cut off perpendicular to the longitudinal axis of the cable and is surrounded by a sleeve 16 lying against the outer insulation 41, which is provided on its inside with a friction-increasing profile 17 and serves as strain relief.
  • the contact piece 32 arranged in the plug body 31 is provided in the center on the cable connection side with a mandrel 18, the longitudinal axis of which coincides with the longitudinal axis of the cable 39 and the tip of which points in the direction of the cable 39 to be connected.
  • the sleeve 16 serving as a strain relief is also provided at its front end with a conical surface 16a and lies with its outer surface against an outer support ring 20 which is integral with the plug body 31 is connected and has at its rear end a conical surface 20a to the conical surface 16a of the sleeve 16. Furthermore, the sleeve 16 is also radially deformable, which can either be done by providing one or more longitudinal slots or by being made from a correspondingly deformable material. The rear end of the sleeve 16 abuts a shoulder 21 of the union nut 9.
  • the sleeve 16 is pushed together with the inner cable 39 with great force axially onto the mandrel 18 and at the same time deformed radially inward, so that a very strong compressive stress builds up between the mandrel 18 and the conductor strand 40 of the cable 39, which one establishes intensive electrical clamping contact and largely shields the contact point against external influences.

Landscapes

  • Coupling Device And Connection With Printed Circuit (AREA)
  • Cable Accessories (AREA)
  • Multi-Conductor Connections (AREA)
  • Processing Of Terminals (AREA)
  • Installation Of Indoor Wiring (AREA)
EP91122139A 1991-01-11 1991-12-23 Vorrichtung für den Anschluss eines Kabelendes Expired - Lifetime EP0494438B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4100600 1991-01-11
DE4100600A DE4100600A1 (de) 1991-01-11 1991-01-11 Vorrichtung fuer den anschluss eines koaxialkabels
DE4140227A DE4140227A1 (de) 1991-01-11 1991-12-06 Vorrichtung fuer den anschluss eines kabelendes
DE4140227 1991-12-06

Publications (3)

Publication Number Publication Date
EP0494438A2 EP0494438A2 (de) 1992-07-15
EP0494438A3 EP0494438A3 (en) 1993-02-03
EP0494438B1 true EP0494438B1 (de) 1996-03-06

Family

ID=25900175

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91122139A Expired - Lifetime EP0494438B1 (de) 1991-01-11 1991-12-23 Vorrichtung für den Anschluss eines Kabelendes

Country Status (8)

Country Link
US (1) US5318458A (da)
EP (1) EP0494438B1 (da)
JP (1) JP2503339B2 (da)
KR (1) KR950012465B1 (da)
AT (1) ATE135143T1 (da)
DE (3) DE4140227A1 (da)
DK (1) DK0494438T3 (da)
ES (1) ES2086472T3 (da)

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Also Published As

Publication number Publication date
ES2086472T3 (es) 1996-07-01
JPH04319268A (ja) 1992-11-10
DE59107516D1 (de) 1996-04-11
ATE135143T1 (de) 1996-03-15
DE4140227A1 (de) 1992-07-23
DK0494438T3 (da) 1996-07-08
EP0494438A2 (de) 1992-07-15
US5318458A (en) 1994-06-07
KR920015660A (ko) 1992-08-27
JP2503339B2 (ja) 1996-06-05
EP0494438A3 (en) 1993-02-03
DE9116154U1 (de) 1992-03-19
KR950012465B1 (ko) 1995-10-18

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