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US 4,075,433 AGranted
Signal switching device
AssigneeNippon Electric Co., Ltd.
InventorsSadayuki Mitsuhashi, Norio Suzuki, Kazuyoshi Nago
Life of this patent
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Abstract
Signal switching devices employing electromagnetic switching elements having particular application in the switching network of automatic telephone exchanges are disclosed. The switching devices are of the kind comprising an input and output signal line electromagnetic switching matrix. The switching devices include a cutoff circuit and/or off-normal circuit integrated with the switching matrix.
Claims5
A signal switching device comprising:
- a magnetic shunt plate having a first set of through apertures arranged in crossing rows and columns and a second set of through apertures formed in a column adjacent to said first set of through apertures;
- electromagnetic switching elements inserted into the respective through apertures in the first and second sets through apertures so as to extend through the magnetic shunt plate;
- first and second coil means associated with each row arranged on the opposite faces of said magnetic shunt plate in the direction of the rows of said through apertures for excitation of said electromagnetic switching elements inserted in said first and second sets of through apertures;
- third and fourth coil means associated with each column arranged on the opposite faces of said magnetic shunt plate in the direction of the columns of said first set of through apertures for excitation of said electromagnetic switching elements inserted in said first set of through apertures;
- and
- fifth coil means for exciting said electromagnetic switching elements inserted in said second set of through apertures.
3 more elements
Dependencies are inferred from the claim text.