US PATENT SUBCLASS 92 / 216
.~.~ Plural separable parts

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

172  DF  PISTON {19}
208  DF  .~ Open-ended hollow skirt type (e.g., trunk type) {15}
216.~.~ Plural separable parts {3}
217  DF  .~.~.~> Interconnected by relative rotation of parts {1}
219  DF  .~.~.~> Interconnected without separate fastening means
220  DF  .~.~.~> Threaded fastener {1}

DEFINITION

Classification: 92/216

(under subclass 208) Apparatus in which the piston is formed of a plurality of parts or sections, joined together by means which allow separation of the parts from each other without in any way destroying or permanently deforming any of the parts or the means for joining the parts.

(1) Note. For classification under this definition, the parts must constitute a major portion of either the end face or side wall portion of the piston. A mere ring positioned in a groove about the periphery of the skirt, for example, which forms but a small area of the side wall portion is excluded. Such subject matter is classified on other features.

SEE OR SEARCH THIS CLASS, SUBCLASS:

187+, for a separable means for pivotally mounting a connecting rod to a piston.

190, for a piston having separable end face and skirt portions secured together by an element which forms a pivot mounting for a connecting rod.

226, for an annular element of diverse material positioned about the periphery of the skirt to limit radial movement of a skirt part.

255, for a piston having plural separable parts. SEE OR SEARCH CLASS

403, Joints and Connections, appropriate subclasses for joints in general. Class 92 takes a joint between metallic parts where the sole disclosure is directed to a piston structure.