Accession Number : ADD018484

Title :   Gas Projection Apparatus for Use in Preventing the Theft of an Automobile.

Descriptive Note : Patent, Filed 19 Sep 94, patented 16 May 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Cooper, Guy F

Report Date : 16 May 1995

Pagination or Media Count : 11

Abstract : A gas projection apparatus for disabling the engine of an automobile being pursued by, for example, a police cruiser. The gas projection apparatus comprises a housing having a charging chamber which receives carbon dioxide gas under pressure from an external source of supply. The charging chamber is partially sealed by a blast valve which is attached to a movable shaft centrally located within the housing. There is also attached to the movable shaft a diaphragm which is positioned in a rear chamber of the housing adjacent the charging chamber. Carbon dioxides from the charging chamber is supplied to the rear chamber exerting a force on the diaphragm. When the force exerted by carbon dioxide gas on the diaphragm exceeds a predetermined pressure level, the diaphragm moves the shaft unseating the blast valve which the pressurized carbon dioxide gas to enter a wave shaping chamber within the housing. A pair of annular ports at the front end of the housing receive the pressurited carbon dioxide gas from the wave shaping chamber and, in combination, with the wave shaping chamber form a train of ring vortices of carbon dioxide gas. The train of ring vortices of carbon dioxide gas is directed to the engine of the automobile being pursued causing the automobile to slow and eventually stall.

Descriptors :   *GASES, *PASSENGER VEHICLES, *PATENTS, *THEFT, VORTICES, MOBILE, ENGINES, SHAFTS(MACHINE ELEMENTS), VALVES, PRESSURIZATION, RINGS, CARBON DIOXIDE, BLAST, POLICE, CHAMBERS, DIAPHRAGMS(MECHANICS), CRUISERS

Subject Categories : Surface Transportation and Equipment
      Machinery and Tools
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE