Base and obturating ring arrangement

Details Base and obturating ring arrangement Base and obturating ring arrangement

1991-01-30

1992-09-15

Bentley, Stephen C.

Ordnance

Breech closures

Gas checks

F41A 374

Patent

active

051479710

ABSTRACT:
An obturating arrangement for a gun barrel of the type having a right-angled obturating ring having its axially extending arm disposed within a recess in the base ring at the end of the gun barrel and its inwardly radially extending arm engaging, in a known manner, a breechblock wedge insert. In known arrangements of this type powder residues generated during firing, which may accumulate in the recess of the base ring and become lodged underneath the supporting face of the obturating ring arm projecting into the recess, may cause the basic play between the obturating ring and the breechblock wedge insert to be reduced, so that malfunctions during the closing of the breechblock wedge may occur. To overcome these drawbacks and also to increase operational reliability and lengthen the time between cleanings, the free end of the obturating ring arm projecting into the recess is arranged at a distance from the base surface of the recess while the rearwardly projecting end of the bead defining the inner wall of the recess is configured as a support for the obturating ring. The free end of the arm projecting into the recess preferably includes a sloped surface tapering toward the exterior of the obturating ring, and thus produces a stripping effect. Powder residues possibly still present in the enlarged volume of the recess can be blown out by fast flowing gases passing through a reduced opening between the bead end and the radially disposed arm.

REFERENCES:
patent: 4022104 (1977-05-01), Politzer et al.
patent: 5054366 (1991-10-01), Bartolles
"Handbook on Weaponry", 2nd English Edition, 1982, pp. 340-341.

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