Class 218/93 - Piston

Subclass of Class 218 - High-voltage switches with arc preventing or extinguishing devices
Definition: Subject matter including details of a solid or hollow disc-like
No. of patents: 4
Last issue date: 03/22/1994

Number	Title	Issue Date
5296662	Electric switching device An electric switching device according to the invention comprises two fixed contacts and one movable contact, referred to jointly as the main contact system. The main contact system is located in an oil-insulated cavity enclosed in a housing. In its direc...	03/22/1994
4307274	Circuit interrupter using dielectric liquid with energy storage A circuit interrupter uses a dielectric liquid such as sulphur hexachloride to extinguish arcs in an interrupter. The liquid is injected at a relatively high pressure by a pump piston with a relatively high mass and an accumulator acts as a pressure fly w...	12/22/1981
4183005	Circuit interrupting device An improved circuit interrupting device includes a pair of relatively movable contacts between which an arc is established. As the contacts are moved apart to elongate the arc, a container of pressurized dielectric fluid directs a flow of the fluid from a...	01/08/1980
4161711	Circuit interrupting device An improved circuit interrupting device extinguishes an arc by directing a dielectric fluid at the arc as it is elongated. Elongation is effected by relative movement apart of a pair of contacts between which the arc is established. A reservoir contains a...	07/17/1979

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