Mitsubishi Denki Kabushiki Kaisha

Toshihiko Kodera

Takayoshi Ishikawa

Kiyoshi Eguchi

Shigemi Tamaru

Yasushi Genba

Susumu Satou

The disclosure describes an air circuit breaker including a compression coil; a second spring holder to compress the compression coil in the axial direction thereof; and a first spring holder which is subjected to the compression force of the compression coil, the second spring holder being constructed in such a manner that it is formed of a plate material in a rectangular shape, a pair of projected pieces are provided on both sides of the plate material, and a pin is held to pass between the pair of projected pieces in the direction of thickness of the plate so as to be able to support one end of the energy accumulating spring at four points with the pair of projected pieces and the pin in a compressible manner. After compression of the energy accumulating spring by pressure application thereto, its pressure application is released to stretch the energy accumulating spring so as to close a pair of contact points through the first and second spring holders.

Air circuit breaker

The present invention describes an air circuit breaker having a bounce preventive device which is provided on the direction changing lever interposed between the link mechanism to drive the contact opening and closing mechanism for closure of the contact and the contact opening and closing mechanism, so as to prevent the bouncing phenomenon from occuring at the time of the OFF-operation, thereby making it possible to secure accurate circuit breaking action.

An arc-suppressing apparatus for a circuit breaker has a pair of side plates having a plurality of first and second grooves formed therein, the second grooves being shallower than the first grooves and extending linearly from the ends of the first grooves to an end of each of the side plates. The side plates are separated by a spacing strut and loosely connected by a bolt and nut so that a space exists between the plates which is large enough to allow a plurality of grids to slide along the second grooves into the first grooves. Thereafter, the nut and bolt are tightened to firmly secure the grids in the first grooves.

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Fukuyama, Japan

Toshihiko Kodera