US PATENT SUBCLASS 337 / 409
.~.~.~.~.~ Plunger or piston

Current as of: June, 1999
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337 /   HD   ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES

298  DF  THERMALLY ACTUATED SWITCHES {7}
401  DF  .~ With fusible, combustible or explosive material {5}
402  DF  .~.~ With manual, gravity-actuated or other mechanical contact control means {4}
407  DF  .~.~.~ Utilizing spring or other energy {2}
408  DF  .~.~.~.~ Reciprocating or slidable motion device {1}
409.~.~.~.~.~ Plunger or piston

DEFINITION

Classification: 337/409

(under subclass 408) Subject matter wherein the sliding or reciprocating structure is specifically recited as consisting of a spring biased plunger or piston device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

108, for similar subject matter in thermoelectrically actuated switches.

SEE OR SEARCH CLASS

74, Machine Element or Mechanism,

2, for automatically controlled trip structure utilizing a fusibly held piston actuator means. 137, Fluid Handling,

72+, especially subclass 75, for heat destructible or fusible control means with spring biased plunger.