.~> Axially extending hollow stem on working member
DEFINITION
Classification: 92/107
(under the class definition) Apparatus comprising (1) a ring shaped working member provided with sealing portions along its inner and outer periphery for sealingly engaging the spaced walls of a chamber formed between a pair of fixed concentric members in which the ring shaped working member is slidably disposed or (2) a longitudinally extending chamber for receiving a ring shaped working member comprising a pair of relatively fixed concentric members said members being spaced from each other to provide a space therebetween.
SEE OR SEARCH THIS CLASS, SUBCLASS:
33, for an annular working member having a coaxial element extending therethrough and mounted for relative rotary movement responsive to reciprocatory movement of the working member.
52, for mutually relatively movable cylinder or sleeve, member slidable therein and outer cylinder therefor, in which the cylinder or sleeve is an annular working member.
93, for an annular flexible wall working member peripherally sealed to spaced relatively fixed concentric rigid members.
