High velocity notched ammunition sabot

• US 4,653,404 A
• Filed: 11/04/1985
• Issued: 03/31/1987
• Est. Priority Date: 03/01/1984
• Status: Expired due to Term

• Current Assignee: OLIN Corporation
• Original Assignee: OLIN Corporation
• Inventors: Halverson, Henry J.
• Primary Examiner(s): Tudor, Harold J.
• Application Number:
  US06/794,882
• Time in Patent Office: 512 Days
• Field of Search: 102/520-522
• US Class Current: 102/520
• CPC Class Codes: F42B 14/064 Sabots enclosing the rear end of a kinetic energy projectile, i.e. having a closed disk shaped obturator base and petals extending forward from said base
• CPC Class Codes: F42B 14/068 Sabots characterised by the material F42B14/067 takes precedence

Abstract

A high velocity ammunition sabot with internal notches of special design to give reliable break-up upon exit from a rifled gun barrel due to centrifugal forces.

Claims

1. A unitary plastic sabot for projection of a metallic subcaliber projectile through a rifled gun barrel, said sabot comprising:

a cylindrical rear base portion;

a cylindrical front portion with a continuous cylindrical outer surface and a cylindrical central recess defining an annular wall adapted to surround and receive a major rear portion of the projectile;

the wall having a plurality of arcuate cylindrical segments connected by weakened portions extending axially on the wall, the weakened portions being defined by rearwardly pointed spaced axial outwardly rounded grooves on the inside of the wall and a continuous cylindrical outer portion of the wall;

said sabot being of a plastic material having compressive strength of at least 15,000 psi as measured by ASTM Test Method D695 and shear strength of at least 12,000 psi as measured by ASTM Test Method D732 to withstand the compressive and shear forces of explosive discharge through said barrel while carrying the projectile in said recess and having an impact notch strength of less than 12 ft-lbs/inch as measured by ASTM Test Method D256 in the portion of the wall between the rear pointed ends of the grooves and the base of the sabot to withstand the sudden application of aerodynamic and centrifugal forces to the wall following the discharge so that after the discharge the wall immediately and substantially simultaneously splits at each groove and the wall segments separate from the base to thereby free the projectile for further flight and whereby the weakened portion of the projection can prior to discharge assist in obturation of the barrel.

2. The sabot of claim 1, further comprising an internal circumferential annular groove in the wall at the junction of the wall with the base, whereby the wall is encouraged to separate at the groove location from the base.

3. The sabot of claim 1 wherein said base portion includes a metallic disc forming a base for the recess whereby to help prevent destruction of the sabot during launch.

4. The sabot of claim 3 wherein said disc is a square washer with rounded corners.

5. The sabot of claim 3 wherein said disc is of greater outside diameter than the diameter of the recess defined by the wall whereby the disc serves as to increase the area of the base portion upon which inertial forces of launching a heavy projectile act.