US PATENT SUBCLASS 482 / 112
.~.~ Confined hydraulic or pneumatic chamber

Current as of: June, 1999
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482 /   HD   EXERCISE DEVICES

92  DF  USER MANIPULATED FORCE RESISTING APPARATUS, COMPONENT THEREOF, OR ACCESSORY THEREFOR {8}
111  DF  .~ Utilizing fluid resistance {1}
112.~.~ Confined hydraulic or pneumatic chamber {1}
113  DF  .~.~.~> Including external conduit structure

DEFINITION

Classification: 482/112

Confined hydraulic or pneumatic chamber:

(under subclass 111) Subject matter wherein the pressure opposing structure uses an enclosed liquid or gas compartment, e.g., a hydraulic or pneumatic cylinder, bag, etc., to enable the liquid or gas to oppose the user.

(1) Note. While the chamber substantially encloses the liquid or gas, it may include an escape valve or port for releasing or admitting the liquid or gas as the apparatus is manipulated by the user. The container does not contain the user.