US PATENT SUBCLASS 188 / 284
.~ Position of thrust member relative to chamber

Current as of: June, 1999
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188 /   HD   BRAKES

266  DF  INTERNAL-RESISTANCE MOTION RETARDER {29}
284.~ Position of thrust member relative to chamber {4}
285  DF  .~.~> Having a fluid flow passage adjusted manually (e.g., threaded plug, threaded rod, gearing)
286  DF  .~.~> Having aperture in chamber wall {1}
288  DF  .~.~> Having varying area of chamber passageway for thrust member
289  DF  .~.~> Having varying area of metering rod extending through orifice in thrust member

DEFINITION

Classification: 188/284

(under subclass 266) Device wherein restraining effort varies in accordance with the location of a thrust member with respect to the variable-volume chamber in which the member moves.

(1) Note. The terms "thrust member" and "variable-volume

chamber" are defined and explained in the definition and Notes of subclass 297.

(2) Note. This and indented subclasses provide for a so-called "two-stage" shock absorber in which movement of a mechanism is retarded to one degree during a portion of such movement, and is retarded to a greater or lesser degree during another portion of such movement.