Alliant Techsystems Inc.

Dipak S Kamdar

Calvin T Candland

Peter L Langsjoen

Todd A VanSlyke

Rollie H Dohrn

Frank Altamura

An obturator having redundant surfaces for sealing between a projectile and a gun tube, where the obturator has at least one gun tube side cannelure. At least one projectile side cannelure is located opposite to the at least one gun tube side cannelure, where the at least one gun tube side cannelure is conformed to seal around the projectile. A tail protrudes from a rearward end of the at least one gun tube side cannelure, where the tail makes an interference fit with the smooth gun bore to make a low pressure seal.

Obturator for large caliber smooth bore ammunition

A spring disc includes a contiguous outer ring including a first plurality of holes and having a contiguous, upwardly curved portion having an outer edge. A middle ring encompasses a second plurality of holes, and a contiguous inner ring, is encompassed by the outer ring and the middle ring. The inner ring surrounds a central aperture sized to accommodate installation onto a cartridge case member, where the outer ring, inner ring and middle ring operate together so as to support the cartridge case by evenly distributing stresses when installed on a cartridge case. A taper angel &thgr; is built into a bottom with a value of about 1&deg; as measured from the bottom extending radially from the center of the inner ring to the outer edge with reference to a plane parallel to an imaginary plane overlaid on the contiguous outer edge.

Spring disc for securing a combustible cartridge case to a case base

A composite sabot including an anti-splitting ring connected to the composite sabot body, to prevent the sabot from splitting during discard. The composite sabot includes sabot petals with fibers oriented in the radial direction and a front scoop for gathering air particles. The anti-splitting ring is mounted to the front scoop portion of the composite sabot where splitting initiates. The anti-splitting ring may be a variety of shapes and materials and attaches easily and inexpensively to any sabot.

Sabot anti-splitting ring

A simplified tailored composite architecture for use in fabricating a composite sabot where the composite sabots are fabricated from a number of wedge kits. The resultant composite sabot includes a front scoop having a scoop angle. The simplified tailored composite architecture includes a panel adapted to be formed into a wedge kit. The panel has a number of plies of prepreg materials oriented in a number of different directions, where one of the number of different directions includes the direction of dominant homogeneous fiber orientation. A pattern within the panel includes selected prepreg segments rotated so that the direction of dominant homogeneous fiber orientation in the selected prepreg segments is aligned to be substantially parallel to the at least one dominant scoop fiber orientation when the panel is subsequently formed into a wedge kit.

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Maple Grove, MN, United States of America

Dipak S Kamdar