PROJECTILE FOR FIRE ARMS

• US 20090308275A1
• Filed: 06/05/2009
• Published: 12/17/2009
• Est. Priority Date: 06/11/2008
• Status: Active Grant

• Current Assignee: Norma Precision AB (Government of Switzerland)
• Original Assignee: Norma Precision AB (Government of Switzerland)
• Inventors: Nilsson, Ake
• Granted Patent: US 8,511,233 B2
• Time in Patent Office: Days
• US Class Current: 102/524
• CPC Class Codes: F42B 12/34 expanding before or on impact, i.e. of dumdum or mushroom type
• CPC Class Codes: F42B 14/02 Driving bands; Rotating bands F42B14/04 takes precedence
• CPC Class Codes: F42B 30/02 Bullets

Abstract

A projectile for fire arms formed in such a way that it includes a front portion of essentially convex axial cross-section that via a transition transforms into a rear portion of essentially cylindrical radial cross-section, which rear portion acts as a power belt for the projectile.

Claims

1. Projectile for fire arms, comprising a front portion of essentially convex axial cross-section that, via a transition, transforms into a rear portion of essentially cylindrical radial cross-section, which rear portion acts as a power belt for the projectile.

2. Projectile according to claim 1, wherein that the front portion of essentially convex axial cross-section has an area at least of subcalibre.

3. Projectile according to claim 1, wherein the smallest diameter of the transition is smaller than the distance between two diametrically opposed lands, and that the transition consists of an axially extended area in the form of a rounding or an oblique line as seen in axial cross-section.

4. Projectile according to claim 1, wherein the projectile is of a type selected from the group consisting of solid, non-expanding, expanding, provided with cavity at the point, jacket-provided filled, bonded, provided with boat tail or not, provided with ballasted boat tail, and sintered.

5. Projectile according to claim 4, wherein, in the case of an expanding projectile, the wall of the projectile increases gradually in thickness from the point of the projectile and is maximum at the area where the front portion has maximum diameter as seen in the direction of cross-section and after that decreases in order to facilitate continued expansion when the velocity of the projectile has decreased.

6. Projectile according to claim 1, wherein a blind hole, which begins at the point of the projectile and which extends in the axial direction of the projectile, is so deep that it extends past the area of maximum diameter as seen in the direction of cross-section.

7. Projectile according to claim 1, wherein the point of the projectile is provided with an anchor ring.