Ordnance – Automatic – Blow back breech block
Patent
1994-03-07
1995-02-14
Jordan, Charles T.
Ordnance
Automatic
Blow back breech block
89193, 8919102, 89192, 89130, 8912901, F41A 526, F41A 362
Patent
active
053885007
ABSTRACT:
Applicant's device improves rapidly firing guns. When such a gun fires, applicant's device delays departure of the gun bolt from the chamber or barrel zone holding a spent round's casing until barrel pressure drops to a safe level. The device has a hollow piston which is translatable fore and aft along the barrel and which has an orifice communicated to a duct from an inner barrel diameter to an outer barrel diameter. The duct slants forward toward the gun muzzle in a radially outward direction so as to direct expanding propellant gas from the barrel against a forward internal surface of the piston. Momentum of the gas keeps the piston in its most forward position and the piston solidly connects to the bolt so that the bolt stays at the chamber when the piston is pressurized. Optionally, the piston may have an escape opening at its aft end so that some of propellant gas entering the piston will be forced rearward, thereby creating an additional forward force on the piston during and immediately after firing of the projectile. Also optionally, the cylindrical wall of the piston flexes outward under blast pressure so as to frictionally against a bore in which the piston translates, thereby additionally retarding piston motion upon firing of the projectile.
REFERENCES:
patent: 2409225 (1946-10-01), Schaich
patent: 2865256 (1958-12-01), Marsh
patent: 2956481 (1960-10-01), Barr et al.
patent: 3101648 (1963-08-01), Walther
patent: 3650177 (1972-03-01), Hupp et al.
Jordan Charles T.
Kuhn David L.
Montgomery Christopher Keith
Taucher Peter A.
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