Mitsubishi Denki K.k.

Takeo Okada

Koichi Takeuchi

Shinichi Aoki

An arc extinguishing chamber confined by a cylindrical housing of stainless steel, and an insulating chamber within a hollow cylindrical insulator, communicate with each other and are maintained in a vacuum with two contacts formed of an electrically conductive material having lower melting and boiling points than copper disposed in the arc extinguishing chamber. A pair of apertured shield plates disposed respectively at each end of the housing and another pair of shield plates mounted respectively on each contact rod are formed of stainless steel. The housing and the shield plates prevent the extinguishing and insulating chambers from overheating during exhaustion at a high temerature and also from being contaminated in operation due to the vaporization of the contacts. Two heating devices are used to heat the housing to a higher temperature than the insulating chamber during the exhausting operation.

Growing community of inventors

Amagasaki, Japan

Takeo Okada