US PATENT SUBCLASS 92 / 240
.~ Side wall portion includes peripheral axially extending flexible lip

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

172  DF  PISTON {19}
240.~ Side wall portion includes peripheral axially extending flexible lip {4}
241  DF  .~.~> With embedded reinforcing means in lip portion (254)
242  DF  .~.~> Plural axially spaced lips {1}
245  DF  .~.~> Lip forms peripheral portion of imperforate cup shaped element
246  DF  .~.~> Metallic lip

DEFINITION

Classification: 92/240

(under subclass 172) Apparatus in which the piston includes around the periphery thereof a lip made of flexible material and extending in a direction axially of the piston, said lip being adapted to be in direct contact with working fluid to be urged in a radial direction thereby when the piston is in operative position in a working chamber.

SEE OR SEARCH THIS CLASS, SUBCLASS:

194, for a piston having a side wall portion which includes a peripheral axially extending flexible lip, and provided with separate resilient means to bias the lip radially.