Projectile for fire arms

• US 8,511,233 B2
• Filed: 06/05/2009
• Issued: 08/20/2013
• Est. Priority Date: 06/11/2008
• Status: Expired due to Fees

• Current Assignee: Norma Precision AB (Government of Switzerland)
• Original Assignee: Norma Precision AB (Government of Switzerland)
• Inventors: Nilsson, ke
• Primary Examiner(s): JOHNSON, STEPHEN
• Application Number:
  US12/479,159
• Publication Number:
  US 20090308275A1
• Time in Patent Office: 1,537 Days
• Field of Search: 102/509, 102/524, 102/507, 102/521, 102/503, 102/508, 102/510, 102/526, 102/527, 102/517, 102/518, 102/519, 102/525, 86/55, 89/11, D22/116
• US Class Current: 102/509
• 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, the projectile comprising:

a front portion of convex axial cross-section over the full axial length thereof that, via a transition portion, transforms into a rear portion of cylindrical radial cross-section, which rear portion acts as a power belt for the projectile, the front portion consisting of;

an acute portion, the entirety of which having a curved axial cross-section and extending from a front point of the projectile to an area where the front portion has a maximum diameter; and

an intermediate portion, the entirety of which having a curved axial cross-section and extending from the area where the front portion has the maximum diameter to the transition portion, the transition portion extending to the rear portion,

wherein the transition portion has a curved axial cross-section, and

wherein the rear portion has a diameter that is equal to the maximum diameter.

2. Projectile according to claim 1, wherein the transition portion consists of an axially extended area in the form of a rounding as seen in axial cross-section.

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

4. Projectile according to claim 3, wherein, in the case of an expanding projectile having an outer surface and a blind hole with an inner wall extending in an axial direction from the front portion of the expanding projectile, the thickness between the inner wall of the blind hole and the outer surface of the expanding projectile increases gradually from the front point of the projectile and is maximum at the area where the front portion has the 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.

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

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