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US 4,024,790 AGranted
Bore gas evacuation device for cannons and guns
AssigneeThe United States of America as represented by the Secretary of the Army
InventorConrad Elmer Heiderer
Life of this patent
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Abstract
A bore gas evacuation system for large and small caliber guns, especially en used in combat vehicles, and employing apparatus carried by the gun barrel and constructed to utilize the Coanda effect to enhance flow of ambient air through the barrel.
Claims3
In a weapon system having a receiver and gun barrel, the improvement comprising a bore gas evacuation system including an axially bored housing attached to the muzzle end of the gun barrel,
- a gas accumulator chamber in said housing,
- said housing having an internal projection with an axial bore therein communicating with the bore of the gun barrel and opening into an enlarged end recess, said end recess terminating in an end wall defining one side of a Coanda slot,
- a nozzle member in said housing having an end wall defining the other side of said Coanda slot,
- the interior of said nozzle including a converging parabolic section located adjacent said Coanda slot, and a divergent section separated from said converging section by a throat section, whereby when said receiver is opened, air at ambient pressure is drawn into said gun barrel by the combined effect of the aspirated ejection gases and propellant gases flowing toward said muzzle under the influence of the Coanda effect.
1 more element
Dependencies are inferred from the claim text.