Ordnance – Pneumatic
Patent
1977-12-22
1979-11-27
Bentley, Stephen C.
Ordnance
Pneumatic
89 33R, F41C 1300
Patent
active
041754700
ABSTRACT:
A gun has a projectile housing and a cartridge chamber, aft thereof, aligned between a barrel and a breech bolt containing a striker. The striker is positioned to impact on primer caps of expendable propellant cartridges, which are placed in the cartridge chamber from a spring-loaded magazine or other conventional means and then ejected when spent. A helical projectile duct, concentric with a bore in the projectile housing intersects the bore just forward of the intersection of the bore with the cartridge chamber, for automatically placing projectiles, one by one, into the bore. A gas port leading from the cartridge chamber enters the projectile duct at a distance from the intersection of that duct with the bore such that gas therefrom will urge a selected number of projectiles into the bore whenever a cartridge is fired. A short venturi tube fixed into the intersection of the bore with the cartridge chamber performs the dual function of accelerating propellant gases and preventing projectiles from entering the cartridge chamber during changes of cartridges. This venturi also enhances the low-pressure characteristics of the main jet of propellant gases in the bore, so that, in cooperation with the back pressure exerted on the projectiles by gases from the gas port, a selected number of projectiles are delivered to the bore whenever a cartridge is fired.
REFERENCES:
patent: 3331282 (1967-07-01), McGowan
Bentley Stephen C.
Marcus Stanley A.
McCullough Edward E.
Thiokol Corporation
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