Breech mechanisms
AssigneeThe Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
InventorGlyndwr T. Samuel
Life of this patent
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Abstract
A sliding breech block suitable for rapid, semi-automatic operation of a bag charge gun comprises two interlinked portions mutually engageable in two dispositions at a stepped interface one of the portions being drivable in a transverse guideway by gun runout via a crank and a shaft, and the other portion being guidable by rollers engaged in cam tracks to follow a semi-arcuate path aligned at one end with the gun barrel axis and at the other with the guideway axis.
Claims8
A breech mechanism for a gun barrel having an axial breech aperture, including:
- a guideway having an axis disposed transverse to and adjacent the breech aperture,
- a breech block slideable in the guideway having a drive portion and an obturator portion interlinked by at least one articulated linkage arm, which two portions are mutually engageable at a stepped interface in two distinct engagements, one being a breech open engagement and the other a breech closed engagement, differing one from the other by a one-step displacement of the interface, and
- cam means operative between the obturator portion and the guideway for constraining the obturator portion, when the drive portion is traversed in the guideway, to follow a part-arcuate path aligned at one end with the axis of the guideway and at the other with the axis of the gun barrel, whereby the obturator portion is caused to change from one to the other of the said two engagements with the drive portion.
Dependencies are inferred from the claim text.