Hitachi, Ltd.

Yuki Nakai

Masanao Terada

Hajime Urai

Hiroaki Hashimoto

Takashi Iida

Noriyuki Yaginuma

Katsuhiko Shiraishi

Yoichi Oshita

A bidirectional driving mechanismhas a drive-side linkage rod, a driven-side linkage rod, two leversthat link the drive-side linkage rod with the driven-side linkage rod, and a guidethat regulates the operation of the drive-side linkage rodand the driven-side linkage rod. A moveable pinis passed through a first groove camof the drive-side linkage rod, a second groove camof the guide, and third groove camsof the levers, and by operation of the drive-side rod, the moveable pinmoves within the respective groove cams, causing the leversto rotate, the driven-side linkage rodto be driven in a direction opposite to the drive-side linkage rod, and a driven-side arc electrodeto be driven in a direction opposite to a drive-side arc electrode

Gas circuit breaker

A gas circuit breaker includes a sealed tank, a movable side main electrode and a fixed side main electrode in the sealed tank facing each other, a movable side arc electrode and a fixed side arc electrode in the sealed tank facing each other, a cylinder at a circumference of the movable side arc electrode, a piston in the cylinder in a slidable manner and forming a puffer chamber together with the cylinder, an insulation nozzle in the sealed tank, an exhaust pipe at a circumference of the fixed side arc electrode and exhausting heat gas, which is sprayed on an arc generated in the insulation nozzle in the opening electrode operation, to an outside, and a closing plate in the exhaust pipe. One or more vent holes leading the heat gas from an inside of the exhaust pipe to the outside is on a surface of the closing plate.

Growing community of inventors

Tokyo, Japan

Yuki Nakai