Electrical connectors – Contact comprising cutter – Insulation cutter
Patent
1999-07-15
2000-10-24
Bradley, Paula
Electrical connectors
Contact comprising cutter
Insulation cutter
439422, H01R 424
Patent
active
061358061
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a junction between an intelligent contact terminal and a cable, said junction comprising connector pins extending from the contact terminal, penetrating into a cable insulation sheath and piercing flat wires included in the cable and provided with lip portions pressing against the lateral faces of the pins.
2. Brief Summary of the Invention
This type of pin junction is known from the Applicant's international patent application WO 95/15594.
An object of the invention is to develop this junction further in order to provide a more secure contact also over a longer period of time.
This object is achieved with a junction of the invention in such a manner that the pins are slightly conical or tapered at least over said lip portions. The conicity of the pins presses the lip portions to a pretensioned state against the elastic insulation of a cable, whereby the junction does not slacken even over a longer period of time. This only requires a very slight conicity or tapering, which is preferably just about 0.1 mm (typically within the range of 0.5-0.3 mm) over the length of 5 mm.
The junction can be further improved by increasing the contact area of the junction. This is performed in a junction of the invention in such a manner that the flat wire is multilayered and, thus, at a junction between the wire and the pin, the lip portions of several wire layers together create an increased contact area which presses against the slightly conical or tapered lateral face of a connecting pin.
The invention will now be described in more detail with reference made to the accompanying drawing, in which
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a section taken at a junction of the invention in an enlarged scale;
FIG. 2 shows a cable in cross-section at the junction.
DETAILED DESCRIPTION OF THE INVENTION
When developing intelligent wiring systems in vehicles, the junction between an intelligent contact terminal and a cable has a major significance for the successful setup of an entire wiring system. The junction must be such that it can be readily produced in automatic manufacturing simply by pressing the contact terminal in place into the cable. On the other hand, the junction must be such that a damaged contact terminal can be replaced with a new one whenever necessary. A particular requirement for the junction is that it must sustain a secure contact even for quite long periods of time. Yet another requirement is that the junction must have a contact area as large as possible in order to avoid transfer resistance and heating caused thereby. All these requirements can be satisfied by means of a junction as described hereinbelow.
An intelligent contact terminal 3 contains necessary electronics (not shown) for controlling the supply of electricity from cable wires 2 to actuators (not shown) connected to the terminal 3. Some of the cable wires 2 are current conductors and some are code conductors, through the intermediary of which the terminal 3 receives its control commands.
The terminal 3 includes connecting pins 4, which extend through a case bottom 5 and attach to a conductor 7 on top of a circuit board 6. Through the intermediary of the conductors 7 the various pins 4 link with electronic components included in the contact terminal 3.
In the present case, the cable 1 includes four flat wires 2 which are surrounded by an insulation sheath 1. The wires can be pre-holed by means of a pointed instrument, having a diameter which is slightly smaller than that of the pin 4 to be pushed into the hole.
The preliminary hole can be made multi-sequentially by first using a smaller pointed tool for making a hole, which is then extended with a second tool. If the hole is made in a single operation, it is necessary to employ a longer tool capable of piercing the entire cable in order not to make the wedge angle too sharp and the force required for piercing too great. The wire 2 must be pierced with as low a force as possible in order not to b
REFERENCES:
patent: 3713072 (1973-01-01), Henschen et al.
Bradley Paula
Oy IWS International Inc.
Tu Tho D.
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