USA As Represented by Secretary of the Navy

W Dale Craig

Michael A Pompeii

Bradley A Repp

Charles K Atwell

Craig S LaMoy

Dallas Wayne Culbertson

Disclosed is an air supply system that provides filtered ventilation to a protected zone which is maintained at a positive pressure so as to prevent contaminants from infiltrating therein. The system further discloses a three-stage air filter apparatus that provides all the necessary filtering to remove contaminants from the air that may be created by chemical, biological and radiological conditions.

Air supply system particularly suited to remove contaminants created by chemical, biological or radiological conditions

Improved double-stage air filter of modular construction for attachment been aligned openings of a spaced double wall structure in order to supply filtered air flow to a controlled area. The filter is generally made up of casing means and combined plate and sleeve means. Both the casing means and plate means are provided with a flange means. The sleeve means is provided with a series of perforations and the plate means flange means is provided with a plurality of relatively spaced slots. The casing means flange means is affixed to the outer wall so that the casing means extends between the walls. The plate means includes retainer means that is affixed to the inner wall so that the sleeve means is inserted in the casing means. Inner and outer filter means for cleaning and purifying an air flow are disposed about the sleeve means. Retainer means are connected to the casing means flange means so as to hold the filter means in sealing engagement between the last mentioned retainer means and the plate means. During use of the filter, an airflow to be filtered is directed through the sleeve perforations, the filter means, and the slots of the plate means flange means thereby supplying filtered air to the controlled area. Depending on the filtered air flow requirements of a controlled area, one or more filters of the invention can be arranged in any suitable arrayed configuration in relation to the walled structure. Whenever a filter needs to be serviced the plate means retainer means is temporarily covered thereby preventing the entrance of unfiltered air to the controlled area. One of the advantages of the double-stage air filter is that it not only removes particles from an air flow, but also purifies same from the toxic effects of chemical, biological, radiological agents, or any combination thereof.

Double-stage air filter

The tail section of a fin-stabilized, guided projectile having centrifuga deployed fins is disclosed. A fin retainer and release mechanism engages the projectile fins and holds the fins within the projectile diameter during normal stowage, handling and travel of the projectile down the gun tube. The fin retainer and release mechanism is designed to operate from the forces of gun launch to enable centrifugal deployment of the fins due to projectile rotation after the projectile leaves the gun tube.

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King George, VA, United States of America

W Dale Craig