US PATENT SUBCLASS 92 / 172
PISTON

Current as of: June, 1999
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92 /   HD   EXPANSIBLE CHAMBER DEVICES

172PISTON {19}
173  DF  .~> With rotation imparting fluid impinging surface on piston part
174  DF  .~> Liquid between axially spaced side wall portions
175  DF  .~> Spaced faces joined by rigid stem (e.g., spool)
176  DF  .~> With enclosed insulating space in piston part
177  DF  .~> Non-circular
178  DF  .~> With ball or roller anti-friction means on side wall portion
179  DF  .~> Articulated connecting rod end forms portions of piston face
181 R  DF  .~> With fluid passage in piston face {2}
186  DF  .~> With ported chamber in piston part for circulating heat exchange fluid
187  DF  .~> With separable means for pivotally mounting connecting rod to piston {3}
192  DF  .~> Plural integral radially extending resilient metallic sealing tongues on side wall portion
193  DF  .~> With spring means for biasing side wall portion radially {4}
201  DF  .~> Radially adjustable side wall portion {4}
208  DF  .~> Open-ended hollow skirt type (e.g., trunk type) {15}
240  DF  .~> Side wall portion includes peripheral axially extending flexible lip {4}
247  DF  .~> Fluid pressure responsive axial movement of end face portion radially moves side wall portion
248  DF  .~> Nonmetallic portion {1}
255  DF  .~> Plural separable parts {3}
260  DF  .~> Welded, brazed or soldered (231)

DEFINITION

Classification: 92/172

(under the class definition) Apparatus comprising a piston as defined in the Glossary of the class definition.

(1) Note. A member secured to the piston so as to be immovable relative thereto (e.g., rigid piston rod) when the piston is performing its intended function in the expansible chamber device is considered as forming a part of the piston.

SEE OR SEARCH THIS CLASS, SUBCLASS:

107+, for a ring shaped piston.

108+, for a piston having a rigidly attached axially extending hollow rod or stem.

120+, for an oscillating piston.

SEE OR SEARCH CLASS 29, Metal Working,

888.04+, for the method of making a piston.

91, Motors: Expansible Chamber Type,

422, and see the search there noted, for a valved piston for an expansible chamber type motor.

123, Internal-Combustion Engines,

47, for a valved piston for use in an internal combustion engine, and subclasses 193.1+ for a piston which is limited for use in an internal combustion engine.

138, Pipes and Tubular Conduits,

30+, for a piston disclosed as for use in a variable capacity pressure compensator.

166, Wells,

153+, for a piston which is fluid driven into a well.

173, Tool Driving or Impacting, 206+, for a piston of a drive motor which forms an impacting hammer head.

251, Valves and Valve Actuation,

324+, for a piston which is disclosed as for use in a piston type valve.

267, Spring Devices, appropriate subclasses for a piston disclosed as for use in a fluid type spring device.

277, Seal for a Joint or Juncture, for a generic sealing means or process,

434+, for a piston ring or piston ring expander or seat therefor.

417, Pumps,

545+, for a valved piston disclosed as for use in a pump. A piston of the type in which a peripheral sealing element is adapted to be deflected out of sealing engagement with a chamber wall during a portion of the stroke of such piston, to allow passage of fluid from one side of the piston to the other is not considered a valved piston for Class 417, and is classified in Class 92.