US PATENT SUBCLASS 188 / 308
.~.~.~ Causing fluid flow through hub of thrust

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}
306  DF  .~.~ Arcuately oscillating thrust member {3}
308.~.~.~ Causing fluid flow through hub of thrust {1}
309  DF  .~.~.~.~> With manually adjusted valve in hub

DEFINITION

Classification: 188/308

(under subclass 306) Device wherein said shaft is provided with an orifice extending generally diametrically therethrough for passage of fluid that is moved by said member.

(1) Note. In this subclass the thrust member (e.g., blade, vane or piston) divides the container (e.g., chamber, cylinder, etc.), into at least two compartments. As the member oscillates in one direction, one compartment decreases in volume and fluid therefrom flows through the orifice into the other compartment which correspondingly increases in volume.