US PATENT SUBCLASS 267 / 64.11
.~ Comprising compressible fluid

Current as of: June, 1999
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267 /   HD   SPRING DEVICES

2  DF  VEHICLE {14}
64.11.~ Comprising compressible fluid {6}
64.12  DF  .~.~> Having lockable strut
64.13  DF  .~.~> Including compressible liquid
64.14  DF  .~.~> Including chamber at sub-atmospheric pressure
64.15  DF  .~.~> With retarder {5}
64.27  DF  .~.~> Having flexible wall
64.28  DF  .~.~> Including means for charging or discharging spring

DEFINITION

Classification: 267/64.11

Comprising compressible fluid:

(under subclass 2) A spring device including a receptacle having a compartment whose volume can be changed, the compartment including a flowable material which can be compressed as the volume is decreased by the application of an external force and which will expand when the force is removed.

(1) Note. In a fluid-spring device when the compressible fluid is subjected to compressive force, none of the fluid escapes from the compartment (e.g., to without the device, or

from one side to the other of a piston head), so that when the force is removed the compartment returns to its normal volume, due entirely to the expansion of the compressed fluid; whereas in a fluid dashpot the fluid does escape, and hence another force must be applied to the device in order to restore the compartment to its normal volume.

(2) Note. This subclass and its indents include the combination of a fluid spring and a retarder device (e.g., fluid dashpot).

SEE OR SEARCH THIS CLASS, SUBCLASS:

113+, for the structure of a fluid spring, per se.

217+, for the combination of a mechanical spring device and a retarder device.

SEE OR SEARCH CLASS 188, Brakes,

297+, for a fluid dashpot, per se.