US PATENT SUBCLASS 92 / 94
.~.~ With separate biasing means

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

89  DF  COLLAPSIBLE CHAMBER WALL PORTION (E.G., HINGED OR FLEXIBLE WALL) {1}
90  DF  .~ Wall portion formed of flexible material {5}
94.~.~ With separate biasing means {1}
95  DF  .~.~.~> Adjustable

DEFINITION

Classification: 92/94

(under subclass 90) Apparatus including a separate means other than the working fluid associated with the flexible wall portion for continuously exerting a force in one direction of movement of said flexible wall portion.

(1) Note. The separate means as set forth in this definition does not include the inherent resiliency of the material forming the flexible wall portion, but must be a separate member (e.g., spring).

SEE OR SEARCH THIS CLASS, SUBCLASS:

40, for a separate biasing means for a bellows type working member.

130+, and the search there noted, for a separate biasing means for a working member.

SEE OR SEARCH CLASS 251, Valves and Valve Actuation,

61.3, 61.4 and 61.5 for a flexible wall expansible chamber valve actuator and valve which is provided with spring means for biasing the flexible wall.