US PATENT SUBCLASS 418 / 45
COLLAPSIBLE PROGRESSIVELY DEFORMED WORKING CHAMBER WALL


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

45COLLAPSIBLE PROGRESSIVELY DEFORMED WORKING CHAMBER WALL


DEFINITION

Classification: 418/45

(under the class definition) Apparatus in which the working chamber is formed at least in part by a flexible wall, said wall being progressively distorted by contact with a member external thereto having a surface substantially circumferentially coextensive therewith to expand or contract the working chamber.

(1) Note. For a definition of collapsible wall, see Class 92, Expansible Chamber Devices, subclass 89.

(2) Note. A flexible coating material forming a surface of the working chamber disclosed merely for wear prevention, sealing, protection against corrosiveness, etc., of the coated part is not considered to be a flexible wall for classification here. See this class, subclass 152 and the notes therein for rotary expansible chamber devices having parts either coated with or made of non-metallic material.