Patent Number: 6,295,192

Title: Switchgear

Abstract: In a switchgear, by using a spring with a varying spring constant from closing to electrode opening as a loading spring, spring load in the opened electrode state is made smaller than a spring load in the closed electrode state to decrease the energy required from electrode closing up to electrode opening. Moreover, by using a spring in which a load in the opposite direction to a load in the closed electrode state works in the opened electrode state, the opened electrode state can be held securely.

Inventors: Kishida; Yukimori (Tokyo, JP), Koyama; Kenichi (Tokyo, JP), Sasao; Hiroyuki (Tokyo, JP), Nishimiya; Kazuhiko (Tokyo, JP), Yamaji; Yuichi (Tokyo, JP), Maruyama; Toshimasa (Tokyo, JP)

Assignee: Mitsubishi Denki Kabushiki Kaisha

International Classification: H01H 33/28 (20060101); H01H 5/00 (20060101); H01H 5/30 (20060101); H01H 33/66 (20060101); H01H 003/00 ()

Expiration Date: 09/25/2018