Bullet

• US 3,881,421 A
• Filed: 02/14/1974
• Issued: 05/06/1975
• Est. Priority Date: 02/14/1974
• Status: Expired due to Term

• Current Assignee: Thomas J. Burczynski
• Original Assignee: Thomas J. Burczynski
• Inventors: Burczynski, Thomas J.
• Primary Examiner(s): Stahl, Robert F.
• Application Number:
  US05/442,421
• Time in Patent Office: 446 Days
• Field of Search: 102/91,92.1-92.6
• US Class Current: 102/509
• CPC Class Codes: F42B 12/34 expanding before or on impact, i.e. of dumdum or mushroom type

Abstract

The invention relates to bullets or projectiles to be fired by rifles, handguns, shotguns and the like, and which are so formed that the bullets will expand rapidly and effectively to as much as twice to three times or more than their original size on impact with the target, while assuring greater than normal stability in flight, as well as flatter trajectories, even at sub-standard velocities, when fired, as compared with conventional hollow-point or other mushroom type bullets. My improved bullets, are characterized by having a relatively deep annular trench or channel coaxially extended therein from the blunt nose of the bullet toward its base, with a center-piece of substantial mass formed centrally within the body of the bullet and projecting forwardly toward the nose but preferably terminating well behind the nose or not substantially beyond the same. On impact with a target composed of a fluid-laden substance, such as animal flesh, the fluid which is trapped in the annular trench or channel of the bullet, and which is inherently incompressible, exerts a tremendous hydraulic or hydrostatic pressure within the trench and results in rapid radially outward expansion of the relatively thin-walled ogive of the bullet while leaving the center-piece intact without shattering or otherwise damaging the same, with a consequent greater penetration and impact shock, even at low velocities than is attainable with conventional hollow-nose or other mushroom type bullets.

Claims

1. A bullet comprising a body of relatively soft material terminating at its forward end in a blunt nose of ogival form, the forward end of the body having a cavity formed therein and extending coaxially into the body to a substantial depth, and a center-piece of substantial mass coaxially extended forwardly from the base of the cavity toward but not substantially beyond the blunt nose of the body of the bullet, the outer wall of the center-piece and the opposing wall of the cavity defining therebetween a deep annular channel or trench terminating at its bottom near the transverse plane of the shoulder of the ogive of the bullet.

2. A bullet as defined in claim 1, wherein the annular trench is V-shaped in radial cross-section.

3. A bullet as defined in claim 1, wherein the bottom of the annular trench lies near a transverse plane at about one-third the length of the bullet behind the nose thereof.

4. A bullet as defined in claim 1, wherein the center-piece is progressively tapered outwardly from its forward end to the base thereof at the base of the cavity and the outer wall of the cavity being progressively tapered inwardly toward the central axis of the bullet from its forward end to the base of The cavity.