Ordnance – Barrels – Recoil increasers
Reexamination Certificate
1999-12-17
2001-11-20
Eldred, J. Woodrow (Department: 3644)
Ordnance
Barrels
Recoil increasers
C089S029000, C042S077000
Reexamination Certificate
active
06318230
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a blank firing attachment for a recoil operated gun.
Recoil operated machine guns using the well known Browning short recoil principle rely on the recoil generated by the expulsion of a standard projectile to generate the forces required to operate the machine gun mechanism. When the gun is required to fire blanks a problem arises if the gun is to function in the fully automatic fire mode. As there is no projectile propelled along the barrel of the gun and the blank cartridge typically only has a small charge of fast powder to provide a loud report there is therefore very little recoil generated.
Accordingly it is known to provide a blank firing attachment which when mounted on a recoil operated machine gun provides a simulation of the recoil which would normally be generated when shooting live ammunition. The attachment therefore results in the automatic mechanism of the gun operating in a normal manner even though blank ammunition is being used.
Such attachments, however, have suffered from a variety of problems ranging from difficulty of installation to unreliability in use. Many of these problems arise from the attachments being of complex construction which requires a high level of maintenance, especially when the attachment is in use, to ensure correct and reliable operation.
SUMMARY OF THE INVENTION
The object of the present invention is thus to provide a blank firing attachment for a recoil operated gun, the attachment being of simple yet rugged construction.
Broadly the invention consists of a blank firing attachment for a recoil operated gun the attachment comprising a barrel having in its length an external shoulder, a gas cylinder in the form of a sleeve, said sleeve being slidingly fitted onto the barrel and located over the external shoulder such that the internal and external shoulders are located opposite one another and spaced apart, said sleeve, shoulders and surface of the barrel forming a gas chamber, there being at least one gas transfer passage in the barrel connecting said gas chamber to the bore of the barrel and fixing means adapted to fix the gas cylinder to the receiver section of the gun.
REFERENCES:
patent: 2714332 (1955-08-01), Saetter-Lassen
patent: 3363509 (1968-01-01), Tschoepe
patent: 3369453 (1968-02-01), Menneking et al.
patent: 4128040 (1978-12-01), Schuetz
patent: 4685378 (1987-08-01), Lusk et al.
patent: 5140893 (1992-08-01), Leiter
patent: 5438907 (1995-08-01), Reynolds et al.
Eldred J. Woodrow
Ordnance Developments Limited
Young & Thompson
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