US PATENT SUBCLASS 218 / 57
.~.~ Puffer piston

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


218 /   HD   HIGH-VOLTAGE SWITCHES WITH ARC PREVENTING OR EXTINGUISHING DEVICES

1  DF  ARC PREVENTING OR EXTINGUISHING DEVICES {14}
43  DF  .~ Air-current blowout {18}
57.~.~ Puffer piston {6}
58  DF  .~.~.~> Polyphase
59  DF  .~.~.~> With gas blast means {2}
63  DF  .~.~.~> With nozzle {1}
65  DF  .~.~.~> Contact structure
66  DF  .~.~.~> Valve (e.g., blast valve or pressure relief valve)
67  DF  .~.~.~> Disconnect switch

DEFINITION

Classification: 218/57

Puffer piston:

(under subclass 43) Subject matter including a relatively movable piston and cylinder, whereby the movement of the contact to the open position causes the relative movement of the piston and cylinder to create a high pressure region which forces the flow of gas through the separating contacts for extinguishing the generated arc.

(1) Note. The words "puffer piston" and "puffer" are used to describe the dynamic characteristics of this type of switch.

(2) Note. The contact assembly usually has a hollow, tubular, or cylindrical configuration.

SEE OR SEARCH THIS CLASS, SUBCLASS:

116, for liquid circuit interrupter.