Ordnance – Breech closures – Gas checks
Patent
1984-06-22
1986-01-28
Bentley, Stephen C.
Ordnance
Breech closures
Gas checks
73167, F41F 1100
Patent
active
045663688
ABSTRACT:
A gun breech mechanism has a barrel formed with a backwardly open shell chamber, a breech block displaceable into a position rearwardly closing the chamber, and a seal ring between the block and the barrel and having an inner face exposed in the chamber and an outer face lying against the block and barrel. A passage opens at the outer seal-ring face for detecting thereat a gas pressure in excess of a predetermined superatmospheric pressure and a device is provided for generating an alarm signal when such excess pressure is detected. A guide bore formed in the block has an end into which the passage opens and an indicating element having an end exposed at the bore end and slidable in the bore between an inner position with its element end close to the passage and an outer position spaced therefrom. Thus pressurized gas can flow through the passage from the outer seal-ring face to the bore. A spring urges the indicating element inward toward the bore end, that is into the inner position. In addition in the inner position the element is at most flush with a surface of the breech and in the outer position it projects from the surface of the breech.
REFERENCES:
patent: 167981 (1875-09-01), Broadwell
patent: 2475387 (1949-07-01), Golden
patent: 3738224 (1973-06-01), Post et al.
Bentley Stephen C.
Rheinmetall GmbH
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