Projectile, particularly for hand firearms and long firearms

• US 4,175,492 A
• Filed: 10/28/1977
• Issued: 11/27/1979
• Est. Priority Date: 10/30/1976
• Status: Expired due to Term

• Current Assignee: Dynamit Nobel AG
• Original Assignee: Dynamit Nobel AG
• Inventors: Zeiher, Erich, Brede, Uwe, Knappworst, Jurgen
• Primary Examiner(s): Pendegrass, Verlin R.
• Application Number:
  US05/846,546
• Time in Patent Office: 760 Days
• Field of Search: 102/91, 102/92.1, 102/92.6, 102/92.7, 102/DIG. 10
• US Class Current: 102/503
• CPC Class Codes: F42B 10/34 Tubular projectiles
• CPC Class Codes: F42B 12/34 expanding before or on impact, i.e. of dumdum or mushroom type

Abstract

A projectile, especially for hand and long firearms, including a projectile body having a longitudinal axis, a front face and a rear face, a deformation cavity extends partially into the projectile body at the front face thereof and a continuous axial bore is provided in the projectile body in communicating relationship with the rear face and the deformation cavity. The projectile body has a wall thickness in the region surrounding the deformation cavity which is smaller than the wall thickness in the region surrounding the axial bore. A cap is initially disposed in the region of the front face of the projectile body for covering at least the deformation cavity, the cap being separated from the projectile body within the barrel of the firearm during firing of the projectile and exiting from the barrel in front of the projectile body.

Claims

1. A projectile for hand and long firearms comprising a projectile body having a longitudinal axis, a front face and a rear face, deformation cavity means extending partially into the projectile body at the front face thereof, continuous axial bore means provided in the projectile body in communicating relationship with the rear face and the deformation cavity means, the projectile body having a wall thickness in the region surrounding the deformation cavity means which is substantially smaller than the wall thickness in the region surrounding the axial bore means, and cap means initially disposed in the region of the front face of the projectile body for covering at least the deformation cavity means, the cap means being separated from the projectile body within the barrel of the firearm during firing of the projectile and exiting from the barrel in front of the projectile body, the projectile body being configured such that the projectile body upon impingement on a soft target is radially expanded in the region surrounding the deformation cavity means so that the projectile body is substantially enlarged in cross section whereas the projectile body upon impingement on a hard target is radially expanded to a smaller extent and axially compressed to a larger extent in the region surrounding the deformation cavity means than upon impingement on a soft target.

2. A projectile according to claim 1, wherein the deformation cavity means is of substantially cylindrical configuration.

3. A projectile according to claim 2, wherein the deformation cavity means is at least partially delimited at the rearward portion thereof by a base surface oriented at right angles to the longitudinal axis of the projectile body.

4. A projectile according to claim 1, wherein the deformation cavity means is of substantially truncated cone configuration, the cone configuration flaring outwardly toward the front face of the projectile body.

5. A projectile according to claim 4, wherein the deformation cavity means is at least partially delimited at the rearward portion thereof by a base surface oriented at right angles to the longitudinal axis of the projectile body.

6. A projectile according to claim 5, wherein the conical surface of the truncated cone configuration has an angle of inclination with respect to the longitudinal axis of the projectile body of about 15°

.

7. A projectile according to claim 1, wherein the projectile body is provided with a transition bore means between and in communicating relationship with the axial bore means and the deformation cavity means, the transition bore means having an inside cross section larger than the inside cross section of the axial bore means and smaller than the smallest inside cross section of the deformation cavity means.

8. A projectile according to claim 7, wherein the cap means is provided with a rearwardly extending pin member for engagement within the transition bore means.

9. A projectile according to claim 1, wherein the projectile body includes an intake section for propellant gases at the rear end face communicating with the axial bore means, the intake section having an inlet opening at the rear end face provided with an inside cross section which is larger than the inside cross section of the axial bore means, the inside cross section of the intake section decreasing in the forward direction from the size at the inlet opening at the rear end face to the size of the inside cross section of the axial bore means.

10. A projectile according to claim 9, wherein the inside cross section continuously decreases.

11. A projectile according to claim 9, wherein the inlet opening of the intake section at the rear side of the projectile body has a relation to the diameter thereof with respect to the diameter of the axial bore means of between about 1.5:

1 and 4.5;

1.

12. A projectile according to claim 11, wherein the ratio of the diameter of the inlet opening of the intake section to the diameter of the axial bore means is between about 2.5:

1 to 3.5;

1.

13. A projectile according to claim 9, wherein the intake section is provided with a conical surface wall configuration.

14. A projectile according to claim 13, wherein the conical wall of the intake section has an angle of inclination of the conical surface thereof with respect to the longitudinal axis of the projectile body of between about 25°

and 65°

.

15. A projectile according to claim 14, wherein the angle of inclination of the conical surface with respect to the longitudinal axis of the projectile body is between about 35°

to 55°

.

16. A projectile according to claim 9, wherein the intake section is provided with a curved surface wall configuration.

17. A projectile according to claim 1, wherein the cap means is provided with a center of gravity lying outside of the longitudinal axis of the projectile body.

18. A projectile according to claim 17, wherein the cap means is provided with a non-rotationally symmetric cross section.

19. A projectile according to claim 8, wherein the cap means is provided with a center of gravity lying outside of the longitudinal axis of the projectile body.

20. A projectile according to claim 9, wherein the cap means is provided with a center of gravity lying outside of the longitudinal axis of the projectile body.

21. A projectile according to claim 6, wherein the projectile body includes an intake section for propellant gases at the rear end face communicating with the axial bore means, the intake section having an inlet opening at the rear end face provided with an inside cross section which is larger than the inside cross section of the axial bore means, the inside cross section of the intake section decreasing in the forward direction from the size at the inlet opening at the rear end face to the size of the inlet cross section of the axial bore means.

22. A projectile according to claim 21, wherein the deformation cavity means is of substantially cylindrical configuration.

23. A projectile according to claim 22, wherein the deformation cavity means is of substantially truncated cone configuration, the cone configuration flaring outwardly toward the front face of the projectile body.

24. A projectile according to claim 23, wherein the cap means is provided with a center of gravity lying outside of the longitudinal axis of the projectile body.

25. A projectile according to claim 1, wherein the deformation cavity means has a relation of the smallest inside diameter thereof to the inside diameter of the axial bore means of between about 3:

1 to 6;

1.

26. A projectile according to claim 1, wherein the deformation cavity means has a relation of the smallest inside diameter thereof to the caliber of the projectile of between about 0.25:

1 to 0.75;

1.

27. A projectile according to claim 1, wherein the projectile body is an unjacketed member.

28. A projectile according to claim 1, wherein the axial bore means is provided with an inside cross section sufficient to enable gas flow therethrough for effecting separation of the cap means from the projectile body without substantially reducing the range of the projectile body.

29. A projectile according to claim 1, wherein the deformation cavity means is responsive to the soft target material accumulating in the deformation cavity means upon impingement of the projectile body on a soft target for radially expanding the projectile body in the region surrounding the deformation cavity means.