US PATENT SUBCLASS 92 / 193
.~ With spring means for biasing side wall portion radially

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

172  DF  PISTON {19}
193.~ With spring means for biasing side wall portion radially {4}
194  DF  .~.~> Biased portion comprises peripheral axially extending flexible lip
195  DF  .~.~> Open ended hollow skirt comprises biased portion {3}
199  DF  .~.~> Adjustable bias (197)
200  DF  .~.~> Split annular type spring (198)

DEFINITION

Classification: 92/193

(under subclass 172) Apparatus in which the piston is provided with a side wall portion which is movable radially with respect to the piston axis, and a separate spring device is provided for exerting a force against said portion of urging the same in such radial direction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

126, for a differential thrust producing means for a working member comprising a spring member for biasing the working member toward one side of the working chamber.

201+, for a piston having a radially adjustable side wall portion.