US PATENT SUBCLASS 188 / 316
.~.~ Fluid through or around piston within chamber

Current as of: June, 1999
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188 /   HD   BRAKES

266  DF  INTERNAL-RESISTANCE MOTION RETARDER {29}
297  DF  .~ Having a thrust member with a variable volume chamber (e.g., coaxial or telescoping tubes, compensating reservoir) {7}
316.~.~ Fluid through or around piston within chamber {1}
317  DF  .~.~.~> Via fixed or variable orifice in piston {4}

DEFINITION

Classification: 188/316

Fluid through or around piston within chamber:

(under subclass 313) Reciprocating piston with fluid flow between chamber compartments wherein fluid moves from one section to another section via (a) an opening in said member extending from one face thereof to an opposite face thereof, or (b) a passageway that exists because said member does not fill the area bounded by the container in which the member moves.

(1) Note. Included in this subclass are devices wherein a piston reciprocates within a cylinder, and the piston is either of smaller diameter than the cylinder or has peripheral grooves extending in the direction of reciprocation, but in either case the difference in dimension forms the passageway for fluid flow.

SEE OR SEARCH THIS CLASS, SUBCLASS:

288, for a shock absorber having a passageway varying in area according to the position of a piston in the passageway.