Obturator system

Details Obturator system Obturator system

1981-10-13

1983-09-20

Bentley, Stephen C.

Ordnance

Breech closures

Gas checks

F41F 1100

Patent

active

044048882

ABSTRACT:
This invention pertains to an obturator system used in large caliber weap, such as cannons, for the purpose of preventing high pressure and temperature gases from propellant charges to escape rearward through the breech. The sealing system consists of a spindle having a mushroom shaped head integral with a shaft portion, a metallic seal ring, and a disc spring. The shaft of the spindle passes through the breechblock such that the conical wedging surface of the mushroom head contacts the interior conical surface of the seal ring. The external conical surface of the metallic seal ring contacts the chamber gas check seat, and the base of the seal ring contacts the top surface of the disc spring which in turn rests against the front face of the breechblock. The function of the disc spring is to provide sufficient force at the base of the seal ring to establish proper initial sealing between the mushroom head wedge surface, the chamber gas check seat, and the conical surfaces of the seal ring when the breech is closed. During the firing cycle, the propellant gas pressure forces the mushroom head rearward to dilate the metallic seal ring against the gas check seat to effectuate a tight seal, and prevent any rearward escape of propellant gases.

REFERENCES:
patent: 270299 (1883-01-01), Freyre
patent: 466320 (1892-01-01), Benet

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