Patent ID: 8916790

Claim:
A switchgear comprising: a vacuum chamber capable of maintaining an inside thereof in a decompressed state; a fixed electrode having a fixed contact at an end thereof, the fixed contact being disposed within the vacuum chamber; a movable electrode having a movable contact at an end thereof, the movable contact being disposed within the vacuum chamber and at a position facing the fixed contact; a linkage assembly configured to electrically connect or disconnect the movable electrode and the fixed electrode; an engaging coil spring configured to transfer a force to the movable electrode in a direction in which the movable contact engages with the fixed contact; a disengaging coil spring configured to transfer a force to the movable electrode in a direction in which the movable contact disengages from the fixed contact; a spring-mounting member configured as a tubular member, having an opening passing through the member in a moving direction of the movable electrode, installed between the movable electrode and the linkage assembly, and provided with the engaging coil spring and the disengaging coil spring; a flange formed at an outer periphery of the spring-mounting member, and being in contact with an end of the disengaging coil spring; a spring seat being in contact with an end of the engaging coil spring, and having an opening; and a bolt fixing the movable electrode and the spring-mounting member together and having a shaft, the shaft passing through insides of the openings of the spring-mounting member and the spring seat, wherein the engaging coil spring is housed within the spring-mounting member, and the disengaging coil spring is disposed along an outer periphery of the spring-mounting member such that centers of the diametric directions of the engaging coil spring and the disengaging coil spring are substantially coaxial and at least a part of the engaging coil spring and a part of the disengaging coil spring overlap each other in the moving direction of the movable electrode, and wherein the spring seat is movable with respect to the spring-mounting member and the shaft of the bolt.