US PATENT SUBCLASS 188 / 283
.~ Piston having a restrictable opening (e.g., apertured plate) in a fixed volume chamber


Current as of: June, 1999
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188 /   HD   BRAKES

266  DF  INTERNAL-RESISTANCE MOTION RETARDER {29}
283.~ Piston having a restrictable opening (e.g., apertured plate) in a fixed volume chamber {1}
283.1  DF  .~.~> Vortex flow passages


DEFINITION

Classification: 188/283

Piston having a restrictable opening (e.g., apertured plate) in a fixed volume chamber:

(under subclass 266) Internal resistance motion retarder wherein restraining effort varies in accordance with the relationship between a passage for fluid medium and an element modifying the size of the passage within a cylinder having a predetermined size.

SEE OR SEARCH THIS CLASS, SUBCLASS:

319.2, for varying orifice size using a hand or hand tool in a variable volume chamber.

SEE OR SEARCH CLASS

267, Spring Devices,

140.11+, for a resilient shock absorber including energy absorbing means having an orifice plate.