US PATENT SUBCLASS 188 / 297
.~ Having a thrust member with a variable volume chamber (e.g., coaxial or telescoping tubes, compensating reservoir)

Current as of: June, 1999
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188 /   HD   BRAKES

266  DF  INTERNAL-RESISTANCE MOTION RETARDER {29}
297.~ Having a thrust member with a variable volume chamber (e.g., coaxial or telescoping tubes, compensating reservoir) {7}
298  DF  .~.~> Forming flexible wall enclosure for fluid
301  DF  .~.~> Causing air suction in chamber
302  DF  .~.~> Rectilinear reciprocation of piston caused by arcuately oscillating frame, shaft, arm, axle, etc. {3}
306  DF  .~.~> Arcuately oscillating thrust member {3}
312  DF  .~.~> Having piston rod extending through ends of chamber
313  DF  .~.~> With valve controlling fluid flow between chambers or compartments of the chamber {1}
316  DF  .~.~> Fluid through or around piston within chamber {1}

DEFINITION

Classification: 188/297

Having a thrust member and variable volume chamber (e.g., coaxial or telescopic tubes, compensating reservoir):

(under subclass 266) Internal resistance motion retarder wherein said first member is moved by a mechanism relative to or within a container for fluid medium; the member together with the container enclosing a space the size of which changes as the member is moved, thus causing fluid contained within the space to be moved relative to both the member and the container.

(1) Note. The term "thrust member" is used to refer to a first member as defined above that is moved in or through a fluid contained in a chamber thereby forcing such fluid to be moved. The thrust member is connected to a load, i.e., a mechanism whose movement is to be retarded, and is moved by the load. Examples of a thrust member include; a piston (connected to a reciprocating piston rod), a blade or vane (connected to a rotating or oscillating shaft) and a flexible diaphragm (connected to a reciprocating or oscillating rod).

(2) Note. This and indented subclasses provide for a device known in the art as "shock absorber", "dashpot", "buffer",

"check", and "cushion", these terms being only examples of the names used.

(3) Note. In this subclass, the chamber is usually a cylinder closed at one end and open at the other and the thrust member is a reciprocating piston having its piston rod extending through the open end. A vent orifice in either the piston or chamber wall permits restricted flow of fluid, usually air, between the chamber and its surroundings.