Brown, Boveri & Cie Ag

Friedhelm Dabringhausen

Heinrich Neumaier

Electric switch includes a fixed contact member and a movable contact member movable from a position wherein it is in contact with the fixed contact member to a position wherein it is spaced therefrom, one of the members having a nozzle-like inner channel, a blast piston-cylinder assembly surrounding the contact members in the contact position thereof wherein the switch is in switched-on condition, the cylinder and the piston being displaceable relatively toward one another in the switched-on condition of the switch so as to compress a gas received in the space between the piston and the cylinder, the fixed and movable contact member in the spaced position thereof, during switch-off of the switch, having an arc therebetween, the arc being blown by an extinguishing flow through the nozzle-like inner channel of the gas compressed by the piston and cylinder assembly, the piston having a base secured to the movable contact member drive means for substantially uniformly actuating on the cylinder, the compressive force of the compressed gas on the piston base driving the movable contact member into switched-OFF position of the switch, and means located between the cylinder and the movable contact member for controlling the course of travel of the movable contact member relative to that of the cylinder.

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Mannheim, Germany

Friedhelm Dabringhausen