TUBE BREECH BLOCK SEALING SYSTEM FOR GUNS

摘要

1. A sealing system disposed between the breech (4) and the combustion chamber (2) of a weapon (1), the breech moving perpendicularly to the axis (7) of the combustion chamber so as to be positioned in front of an opening in the latter at the location of the rear face (3) of the weapon, a system consisting of an elastically deformable ring (6) having a cylindrical side surface (13) enabling it to fit into a housing (4) in the combustion chamber (2) and a front sealing surface (12) brought into contact with a portion of the breech (4) by elastic means, characterized in that the ring (6) comprises, in its side surface (13), two protrusions (9) symmetrical with each other as to the ring axis (24), associated with two cams (8) integral with the breech, which apply axially the ring in its housing (14) outwardly from the breech during a part of the breech locking motion.