Electricity: circuit makers and breakers – Multiple circuit control – Automatic multiple contact selective means
Patent
1989-05-10
1990-09-04
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Automatic multiple contact selective means
200177, H01H 116, H01H 6726
Patent
active
049546740
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a matrix switching device for providing making, breaking or switching patent between a plurality of first conductor pairs and a plurality of second conductor pairs, where each pair comprises an a and a b conductor. The switching function is arranged so that one or more a conductors in the first pair (the x path) are connected to the a conductors in the second pair (the y path) simultaneously as making or breaking is carried out between one or more b conductors in the first and second pairs (the x path and y path). The device in accordance with the invention can be used as a so-called crossbar switch, both for analogue and digital signals.
BACKGROUND ART
The galvanic connection of electrical signals in so-called crossbar switches is already known. For example, there is illustrated in the French design making 2.447.623 a galvanic crossbar switch with a plurality of incoming conductors in one plane (x) and a plurality of outgoing conductors in another plane (y). The conductors in the x plane and the y plane form a matrix with a plurality of cross points. These cross points can be connected together by activating switching rods at each cross point.
Particularly with access networks in the art of telephony there is a need of automatic, remotely controlled crossbar switches for avoiding sending out personnel for connecting cable pairs in buldings and distribution cabinets. On the station side there is the same problem in switching between different types of service units and in broken-out units for connecting telephone subscribers such as broken-out subscriber stages and line circuits. For these applications galvanic switching is the most suitable method of operation.
Crossbar switches of the kind mentioned above are also desired for enabling measurements on lines, by connecting the measuring equipment galvanically to the line. These crossbar switches must have great reliability, must not malfunction if there is a power failure and must not take any power in an inoperative state. The demands made according to the above on this equipment makes it unsuitable to introduce electronics in the parts which are to provide the connection paths between incoming and departing conductors.
The crossbar switch according to the above mentioned French design patent can indeed be used for the purposes mentioned above, but is limited to making or opening individual, separate cross points in the matrix, and can be only used for low frequencies.
DISCLOSURE OF INVENTION
The present invention relates to a further development of previously known galvanic crossbar switches with the switching function itself between incoming and outgoing conductors in the connection matrix having been improved. Switching can therefore take place galvanically and with a mechanical lock of the set-up connection points. The lock primarily results in that less forces are required for switching (the OFF position to the ON position and vice versa). In addition there is obtained more rapid and reliable operation and a possibility of constructing the switch so that it has smaller dimensions. This also enables high-frequency signals to be switched through the apparatus, thus making it utilizable for digital line systems.
In accordance with the inventive concept, spherical conductive or non-conductive elements, preferably balls, are used as connection elements for providing electrically conductive or non-conductive contact between the x and y conductors in a connection matrix. In the case where the x and y conductors each consist of conductors pairs (a and b conductors), simultaneous switching (closing and opening) of the a and b conductors in a pair can be achieved with the aid of rods which transmits the operating force from one connection site, e.g. the a conductors, to an adjacent connection site, e.g. the G conductors. The spherical embodiment of the connection elements at the cross points enables a large contact pressure to be created with small operating power.
The object of the present invention is thus to provide a
REFERENCES:
patent: 2647166 (1953-07-01), Lens
patent: 2997557 (1961-08-01), Gillmor et al.
patent: 3354434 (1967-11-01), Shlesinger, Jr.
Scott J. R.
Telefonaktiebolaget L M Ericsson
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