Electrical connectors – Contact comprising cutter – Insulation cutter
Patent
1992-10-14
1994-06-28
Pirlot, David L.
Electrical connectors
Contact comprising cutter
Insulation cutter
439417, 439402, H01R 1704
Patent
active
053242122
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
This invention relates to a device for disconnectably connecting cable wires to a contact plate, and particularly to such a device designed to engage two different cable wires in a housing of electrically non-conductive material, preferably plastics material, wherein one of the cable wires to be contacted can be brought into contact with the contact plate, preferably, by means of a screw element.
SUMMARY OF THE INVENTION
An electrical contacting device for connecting cable wires is known, for example, from EP-0 315 345-A2. In the known device, contact plates are provided in pairs in a plastics housing. The contact plates have metal slots on both sides which, are in the form of cutting blades, and are thus able to cut through the insulating jacket of the cable wire to be contacted and clamp the metallic conductor inside them. An electrical connection is thus made by means of this contact plate between the two contacted cable wires. If one of the cable wires has been preinstalled, for example at the factory, the idea of such devices is to insert the cable wire to be connected and press it by means of a thrust element between the cutting blades in the contact plate. In the known solution, this is achieved by means of a cap screw with the aid of which cable wires are pressed in pairs into contact plates arranged in pairs.
The known solution has a number of advantages, but does involve some disadvantages. As examples the following may be mentioned.
(1) The contacting mechanism is relatively complicated in that, in order to press the cable wire between the cutting blades, the cover of the device has, in practice, to be moved.
(2) Testing of whether the cable wires have been contacted or not can be carried out only with difficulty.
(3) A particular drawback is that, once a cable wire has been pressed in between the cutting blades of the contact plate, it is very difficult, if not impossible, to release and withdraw the cable wire so contacted, for example if it has not been installed correctly. In order to do this, it is necessary to unscrew the entire lid so that the contacted cable wire can be lifted out using a tool.
An object of the present invention is to provide a solution which simplifies construction, and which renders possible both testing for contacting and easy removal of a cable wire once contacted should the cable wire have to be replaced.
Thus the present invention provides a device for disconnectably connecting cable wires to a contact plate designed to engage two different cable wires, wherein the cable wire to be contacted can be brought into contact with the contact plate preferably by means of a screw element characterised in that
(a) the contact plate is provided with a through opening for the cable wire to be contacted, and
(b) a thrust piece is provided, which surrounds or overlaps at least part of the contact plate and is longitudinally displaceable thereover, wherein the thrust piece is also provided with a through opening, corresponding to, and movable relative to, the through opening in the contact plate.
DETAILED DESCRIPTION OF THE INVENTION
Preferably the device is mounted in a housing of electrically non conductive material.
Preferably the contact plate is secured non displaceably in the housing.
The invention provides a number of advantages compared to the known solution described above. For example it is possible to use simple components, for example rotationally symmetrical components. The through openings in the thrust piece can be used not only for contacting, but also for releasing a cable wire once contacted. This is described in detail hereinafter. The force to be applied in contacting can be controlled in a simple manner, and so on.
Further advantages of the invention are apparent in preferred embodiments of the invention which are described hereinafter.
For example testing means may be provided to check the electrical contact made. In one embodiment a test vane is provided integrally, but at an angle to the contact pl
REFERENCES:
patent: 4175818 (1979-11-01), Kourimsky et al.
patent: 4541679 (1985-09-01), Fiedler et al.
patent: 4793822 (1988-12-01), Cozzens et al.
patent: 4793824 (1988-12-01), Cozzens et al.
patent: 5006077 (1991-04-01), Loose et al.
Adamaszek Dieter
Fremgen Dieter
Vandeputte Filip
Vansant Jan
Burkard Herbert G.
Pirlot David L.
Raychem Corporation
Zahrt II William D.
Zavell A. Stephen
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