Ordnance – Breech closures – Gas checks
Patent
1990-07-17
1991-10-22
Bentley, Stephen C.
Ordnance
Breech closures
Gas checks
89 24, F41A 374
Patent
active
050584820
ABSTRACT:
A blocking device for blocking the closing movement of a wedge-type breechblock of a gun if an obturating ring is missing. The blocking device includes a detector which is urged toward a recess in the gun barrel base ring and which enters the recess if the recess is not occupied by an obturating ring. In order to avoid damage to the sealing system of the base ring during the blocking process, the blocking device is configured as a synchronous mechanism so that, if the detector moves into the recess in the absence of an obturating ring, a blocking member simultaneously moves in the opposite direction and enters a recess in the breech ring of the gun. In one embodiment, the synchronism of the blocking device is produced by a gear which meshes with toothed regions on the detector and of the blocking member. In another embodiment, the synchronism is produced by a dual level member which extends into recesses in the detector and the blocking member. Advantageously, the recess which is already provided in the breech ring can be utilized for blocking the wedge-type breechblock and for releasing the blocking device.
REFERENCES:
patent: 43820 (1864-08-01), Krupp
patent: 3420139 (1969-01-01), Bartels
Bentley Stephen C.
Rheinmetall GmbH
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