US PATENT SUBCLASS 188 / 287
.~.~.~ Plural, successively encountered apertures

Current as of: June, 1999
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188 /   HD   BRAKES

266  DF  INTERNAL-RESISTANCE MOTION RETARDER {29}
284  DF  .~ Position of thrust member relative to chamber {4}
286  DF  .~.~ Having aperture in chamber wall {1}
287.~.~.~ Plural, successively encountered apertures

DEFINITION

Classification: 188/287

(under subclass 286) Device provided with more than one of said openings, wherein said thrust member moves past said openings in sequence.

(1) Note. In this subclass flow of fluid is gradually restricted to a greater degree as the piston passes and closes the orifices successively.