US PATENT SUBCLASS 49 / 273
.~ Load maintained, self-returning

Current as of: June, 1999
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49 /   HD   MOVABLE OR REMOVABLE CLOSURES

263  DF  TREADLE OR IMPACT INITIATED OPERATOR {8}
273.~ Load maintained, self-returning {1}
274  DF  .~.~> Spring return

DEFINITION

Classification: 49/273

(under subclass 263) Device wherein the closure is opened and retained in open position by the weight of the closure user

upon a treadle and wherein means are provided to close the closure when the weight of the user is removed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

106, for a similar treadle operator which actuates interconnected closures.

386+, for a biasing means for a closure mounted for swinging movement and see the search notes hereto for loci of other closure biasing means.