US PATENT SUBCLASS 337 / 390
.~.~.~.~ Snap-action

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

298  DF  THERMALLY ACTUATED SWITCHES {7}
382  DF  .~ With longitudinally expansible solid element {7}
384  DF  .~.~ With manual or other mechanical contact control means {4}
388  DF  .~.~.~ With spring or other energy storage means {2}
390.~.~.~.~ Snap-action {1}
391  DF  .~.~.~.~.~> With flexible vane or plate

DEFINITION

Classification: 337/390

(under subclass 388) Subject matter including significant details of means whereby the opening or closing contact motion is caused to take place abruptly and is not dependent on the rate of movement of the thermally responsive element. The contact movement is usually accomplished by a spring connection between the operator and the movable contact in such a manner that the initial movement of the thermally responsive element or other actuating means places the spring under tension, as by a toggle, until released whereupon the movable contact is snapped to open or closed position by the energy stored in the spring.

(1) Note. For other snap action means used in devices of this class, see SEARCH THIS CLASS, SUBCLASS.

SEE OR SEARCH THIS CLASS, SUBCLASS:

53, For other snap action means used in devices of this class, see the subclasses listed under Search This Class, Subclass in subclass 53.

131+, above for similar subject matter in an electrothermally actuated switch with a longitudinally expansible element. See (1) Note above.