US PATENT SUBCLASS 123 / 200
ROTARY

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

200ROTARY {12}
201  DF  .~> Reversible
202  DF  .~> With means to control degree of compression
203  DF  .~> With combusted gas treatment or handling means
204  DF  .~> With compression volume means in uninterrupted communication with expansion volume means
205  DF  .~> With fuel injection means {4}
210  DF  .~> With ignition means {1}
212  DF  .~> With plural compression volume means {1}
214  DF  .~> With plural expansion volume means {1}
216  DF  .~> With charge treatment means {4}
221  DF  .~> With transfer means intermediate single compression volume means and single expansion volume means {5}
241  DF  .~> With compression, combustion, and expansion in a single variable volume {4}
247  DF  .~> Only combustion and expansion of charge in engine {2}

DEFINITION

Classification: 123/200

ROTARY:

(under the class definition) Apparatus having a cylinder structure enclosing a piston structure wherein the piston structure cooperates with the cylinder structure and one or more other elements to constitute an enclosed space for burning the combustible material wherein the piston structure and cylinder are capable of relative rotary movement.

(1) Note. A rotary expansible chamber device having only nominally claimed air or fuel supply, air or fuel modifying means or ignition means without recitation of any other combustion aspects such as stratification, charge forming, scavenging, compression, etc., is properly classified in Class 418.

(2) Note. Included in these subclasses are engines wherein a

gas is transferred or moved from one variable volume to another. Transfer of gas after being acted upon by one surface of said piston to a point where said gas acts upon another surface of said piston is considered to be a transfer to a different volume.

(3) Note. The majority of the engines found within this and indented subclasses are of the type in which the cylinder structure is stationary and the piston structure rotates; however, also included are engines wherein the cylinder structure rotated and the piston structure remains stationary, such engines being treated as kinematically inverted.

(4) Note. The term "rotor" herein is synonymous with "piston structure"; the term "enclosed space" is synonymous with "working chamber". The term "rotation" herein includes "plantation". The term "partition structure" and "vane" are synonymous and refer to the generally long, thin platelike elements capable of reciprocation and designed to form working chambers within the engine by the separation of one volume of the piston-cylinder volume from others.

(5) Note. Further included in these subclasses, from Class 60 (old subclass 39.61) are rotary engines provided with a volume structure external to the enclosed space for burning and with means for intermittently communicating the enclosed space with the external volume structure such that the combustion may occur either within the enclosed space or the external volume structure.

SEE OR SEARCH THIS CLASS, SUBCLASS: 43+, for internal-combustion engines comprising a cylinder or cylinders having a continuous rotary movement, and pistons having reciprocating movement relative to the cylinder.

SEE OR SEARCH CLASS

418, Rotary Expansible Chamber Devices, appropriate subclasses for devices with similar structure but without significant internal-combustion features. See Class Definition, section III, miscellaneous class notes of Class 418, and (1) Note above in this subclass for statements of the line between Class 123 and Class 418.