(under the class definition) Apparatus including a plurality of members each of which is rotatable about a common axis substantially in a common plane and having working chamber surfaces rotating in the same path, movement in one direction of at least one of the members being alternately and
relatively increased and retarded whereby to expand and contract the working chamber and at least one of the members producing work.
(1) Note. A rotary expansible chamber device having working member portions (e.g., vanes, etc.), undergoing relative acceleration and declaration only because of either the eccentricity of the device or the working chamber design is not deemed proper for classification here.
