Electrical connectors – Contact comprising cutter – Insulation cutter
Reexamination Certificate
1998-09-24
2001-07-17
Ta, Tho D. (Department: 2833)
Electrical connectors
Contact comprising cutter
Insulation cutter
C439S417000, C439S402000
Reexamination Certificate
active
06261117
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a device for connecting at least two conductive wires each surrounded by an insulating sheath, comprising a casing in which a passage is provided for introduction of an end portion of the sheathed wires, means for receiving the said end portions in the casing, means arranged to be introduced into the casing transversely to the sheathes, comprising at least two slots to grip the sheathes of the wires and to draw them towards the inside and the bottom of the casing and which are arranged to cooperate with the means for receiving the sheaths in order to strip the wires longitudinally.
BACKGROUND OF THE INVENTION
The device of the invention serves to connect, mechanically and electrically, wires of a plurality of strands or preferably a single strand.
Connection devices of this type are already known, in particular from the French patent 86 15553, published under the number 2 606 558.
In the device of this patent a conductive clip, provided, between teeth, with slots for drawing the wires is displaced along a catch provided with an opening for receiving the wires with a lower edge forming a conductive stripping edge, to draw the ends of the wires towards the bottom of the casing and to strip the wires longitudinally.
The latter device was already an improvement on other devices of even older prior art, but it still not fully satisfactory.
The catch is carried by a slide, or plug, which is pushed into the casing to displace the lip along the catch and to produce the connection, the plug being pushed into the casing by the operator with the aid of a squeezing device.
It can happen that the plug is not perfectly introduced into the casing. In this case when it is pushed in the clip does not move parallel to the catch. This can also be the case by reason of the sole factor of the handling of the squeezing device. By tilting the clip a wedging effect between the clip and the catch can arise and cause not only the sheathes but the wires themselves to be cut.
SUMMARY OF THE INVENTION
The present invention thus aims to propose a connection device of the type mentioned above without the risk of cutting the wires.
To this end the connection device is characterised in that it comprises spacing means between the means for receiving the sheathed wires and the gripping and drawing means to keep their spacing greater than a cutting threshold.
The spacing means are preferably arranged so that the gripping and drawing means are introduced into the casing parallel to the means for receiving the sheathed wires.
In an advantageous embodiment of the device of the invention the spacing means are disposed on the gripping and drawing means.
In this case the spacing means can have been connected to the gripping and drawing means, for example, by soldering, or have been produced by forming the gripping and drawing means, for example, by embossing. It may be a positive formation on the side turned towards the reception means (boss, rib or any other projection), or a negative formation on the opposite side (groove).
It will be noted that the document GB-A-1 034 996 discloses a clip comprising a groove which is hollow on the side opposite to a catch but this groove in no way has the function of avoiding an effect of wedging between the two pieces. It serves only to receive the strands of a single wire. The idea of spacing does not appear in this document.
In the same way the document U.S. Pat. No. 3,963,318 involves the edges of a clip but only those which serve to stiffen it and especially to determine a cutting length for the conductors, unconnected with the spacers intended to avoid cutting the wires.
Still with the aim of avoiding cutting the wires, the passage for introducing sheathed wires into the casing advantageously comprises wire separation means with the aid of which the wires are prevented from crossing and being cut when the reception means and the gripping and drawing means cooperate.
REFERENCES:
patent: 3243757 (1966-03-01), Cobaugh
patent: 3257635 (1966-06-01), Cobaugh
patent: 3350679 (1967-10-01), Marley et al.
patent: 4435034 (1984-03-01), Aujla et al.
patent: 4723918 (1988-02-01), Lacroix
patent: 4820191 (1989-04-01), Lacroix
patent: 6027362 (2000-02-01), LaCroix
Rzucidlo, Esq. Eugene C.
Ta Tho D.
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