Chevron grooved decoupling obturator

F - Mech Eng,Light,Heat,Weapons – 42 – B

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102/29

F42B 5/26 (2006.01) F42B 9/26 (1980.01)

Patent

CA 1146804

Chevron Grooved Decoupling Obturator Abstract An obturator for a projectile (10) to be fired from a rifled barrel (12) is provided in accordance with this invention, with this obturator being mounted on the projectile in such a way as to permit rotational slippage. A preferred form of our obturator comprises a ring (16) of non-metallic material, which ring is capable of being mounted on a circular body portion (20) of the projectile. An external portion of the obturator ring has a plurality of encircling slots (26), essentially parallel to each other, which slots are rearwardly in- clined so as to define a plurality of chevron-like members (28) designed to forcibly engage the rifling of the barrel. The interior of the obturator ring is designed to slip rotationally with respect to the pro- jectile body portion as the projectile travels along the barrel, thereby advantageously minimizing the rotation of the projectile as a result of rifling effects. One embodiment of an obturator (46) in accor- dance with this invention may be designed to disintegrate as it leaves the barrel, whereas another embodiment (16) may utilize an overwrap of high temperature fila- mentary material (36) in at least some of the slots, which overwrap serves to increase the hoop strength of the obturator.

353896

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