US PATENT SUBCLASS 92 / 194
.~.~ Biased portion comprises peripheral axially extending flexible lip

Current as of: June, 1999
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92 /   HD   EXPANSIBLE CHAMBER DEVICES

172  DF  PISTON {19}
193  DF  .~ With spring means for biasing side wall portion radially {4}
194.~.~ Biased portion comprises peripheral axially extending flexible lip

DEFINITION

Classification: 92/194

(under subclass 193) Apparatus in which the radially movable

side wall portion comprises a lip made of flexible material extending around the periphery of this piston and in a direction axially of the piston, and the spring device exerts a force on said lip for urging the same in a radial direction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

240+, for a piston having a side wall portion which includes a peripheral axially extending flexible lip.