Arrangement in or relating to a projectile

• US 4,353,302 A
• Filed: 05/06/1980
• Issued: 10/12/1982
• Est. Priority Date: 07/01/1976
• Status: Expired due to Term

• Current Assignee: A/S Raufoss Ammunisjonsfabrikker
• Original Assignee: A/S Raufoss Ammunisjonsfabrikker
• Inventors: Strandli, Kaare R., stlie, Arne M.
• Primary Examiner(s): TUDOR, HAROLD JAY
• Application Number:
  US06/147,051
• Time in Patent Office: 889 Days
• Field of Search: 102/517-519, 102/501, 102/364, 102/365, 102/473
• US Class Current: 102/364
• CPC Class Codes: F42B 12/06 with hard or heavy core; Kinetic energy penetrators F42B12/16, F42B12/74 take precedence
• CPC Class Codes: F42B 12/204 for attacking structures, e.g. specific buildings or fortifications, ships or vehicles
• CPC Class Codes: F42B 12/44 of incendiary type F42B12/46 takes precedence

Abstract

A projectile has a primary penetration element arranged at the rear end, and surrounded by a substantially tube like secondary penetration element, so that in front of the primary penetration element is formed a cavity within the secondary penetration element. The cavity contains a bursting charge or bursting and incendiary charges, ignitable by means of an ignition charge arranged in the nose of the projectile upon impingement against a target. The construction is such that the primary penetration element is positively prevented from moving forwardly into the cavity before the projectile hits a target and the secondary element is substantially fragmented. The projectile gives considerable splinter and fragmentation in lighter to medium targets, while functioning generally as a purely armor piercing projectile against heavy targets.

Claims

1. A multi-capability projectile providing substantially splinter, fragmentation and incendiary effect after penetration of a target wall of a predetermined thickness in combination with substantial armor piercing properties, comprising a primary penetration element and a secondary penetration element, said primary penetration element being located toward the rear of the projectile and surrounded over its full length by said secondary penetration element such that said primary penetration element is disposed completely inside said secondary penetration element, the secondary penetration element being substantially longer than said primary penetration element and extending substantially beyond said primary penetration element toward the front of the projectile so as to define a cavity in the secondary penetration element forward of the primary penetration element, the secondary penetration element terminating at its forward end rearward of the front end of the projectile, bursting charge means located in said cavity no farther forward than the front end of the secondary penetration element, means defining a nose at the forward end of the projectile, forward of the secondary penetration element, an incendiary charge located in said nose for igniting upon deformation of the nose upon impacting a target, and hence for igniting said bursting charge, said nose being substantially completely filled with said incendiary charge, and hence being devoid of mechanical fuses or firing pins, said incendiary charge being constructed to burn at at rate which will delay detonation of the bursting charge until the bursting charge and its surrounding portion of the secondary penetration element have essentially passed through said wall, whereby detonation of the bursting charge, and hence splintering and fragmentation of the secondary penetration element occurs past said wall, and retaining means located forward of the rear end of the secondary penetration element for retaining said primary penetration element substantially immobile relative to said secondary penetration element prior to impact of the projectile with a target, said retaining means including a projecting surface which projects inwardly from said secondary penetration element to securely engage the primary penetration element.

2. A projectile as claimed in claim 1 wherein said secondary penetration element is formed of steel.

3. A projectile as claimed in claim 1 wherein said primary penetration element is of substantially uniform diameter over the great majority of its length.

4. A projectile as claimed in claim 1 wherein said secondary penetration element is formed of steel and terminates short of the nose of said projectile, and said nose is formed of a softer metal.

5. A projectile according to claim 1 wherein said primary and secondary penetration elements and said charges are surrounded by a projectile mantel of soft metal such as copper.

6. A projectile as claimed in claim 1 wherein said means for retaining said primary penetration element comprises a shoulder in the bore of said secondary penetration element defined by a change in diameter, such that said primary penetration element abuts against said shoulder.

7. A projectile as claimed in claim 1 including radially extending, axially facing, and abutting surface portions formed in the bore of said secondary element and the surface of said primary element for positively preventing forward movement of said primary element into said cavity until said secondary element is substantially fragmented.

8. A projectile as claimed in claim 1 wherein said means for retaining said primary penetration element substantially immobile relative to said secondary penetration element comprises interfering surface engagement between part of the surface of said primary penetration element and part of the interior surface of said secondary penetration element.

9. A projectile as claimed in claim 1, said retaining means comprising a partition portion of the secondary penetration element extending completely across its cavity so as to close off the cavity, the forward end of said primary penetration element abutting against said partition.

10. A projectile as claimed in claim 1, wherein the rear end of the secondary penetration element is formed as an end closure for said projectile.

11. A projectile as claimed in claim 1, including an end closure element attached to the rear end of the secondary penetration element to form an end closure for said projectile.

12. A projectile as claimed in claim 1, wherein the secondary penetration element forms the exterior of the projectile.