Expanding bullet

Abstract

An expanding bullet having a one-piece structure has a cylindrical section and a section that is essentially shaped as a truncated cone, with the bullet tip being situated at the end of the latter section, which end faces away from the cylindrical section, and at least one planned breaking point being formed in this section, wherein the section shaped as a truncated cone is divided into segments and has a channel that has a mouth in the region of the bullet tip, wherein the channel has a bell-shaped widened region, which has its greatest diameter in the region of the transition from the cylindrical section to the section shaped as a truncated cone.

Claims

1. An expanding bullet having a one-piece structure, which bullet has a cylindrical section and a section that is essentially shaped as a truncated cone, with the bullet tip being situated at the end of the latter section, which end faces away from the cylindrical section, and at least one planned breaking point being formed in this section, wherein the section shaped as a truncated cone is divided into segments and has a channel that has a mouth in the region of the bullet tip, wherein the channel has a bell-shaped widened region, which has its greatest diameter in the region of the transition from the cylindrical section to the section shaped as a truncated cone.

2. The expanding bullet according to claim 1, wherein at least one flaw is situated on a mantle surface of the section shaped as a truncated cone.

3. The expanding bullet according to claim 1, wherein the mouth is formed as a conical diameter increase of the channel and/or the channel has a sectionally constant diameter between the mouth and the bell-shaped widened region.

4. The expanding bullet according to claim 2, wherein the mouth is formed as a conical diameter increase of the channel and/or the channel has a sectionally constant diameter between the mouth and the bell-shaped widened region.

5. A method for producing an expanding bullet, which bullet has a cylindrical section and a section that is essentially shaped as a truncated cone, with the bullet tip being situated at the end of the latter section, which end faces away from the cylindrical section, and at least one planned breaking point being formed in this section, wherein the section shaped as a truncated cone is divided into segments and has a channel that has a mouth in the region of the bullet tip, wherein the channel has a bell-shaped widened region, which has its greatest diameter in the region of the transition from the cylindrical section to the section shaped as a truncated cone, wherein the expanding bullet is produced by means of massive forming.

6. The method according to claim 5, wherein the expanding bullet is produced from wire, which is cut to length in a massive-forming machine and/or is center-punched at one end face with a graining tool.

7. The method according to claim 5, wherein the expanding bullet is produced from copper wire, which is cut to length in a massive-forming machine and/or is center-punched at one end face with a graining tool.

8. The method according to claim 5, wherein first an end face of a bullet blank is split into a plurality of segments and then a central recess is formed in the bullet blank starting from the split end face.

9. The method according to claim 6, wherein first an end face of a bullet blank is split into a plurality of segments and then a central recess is formed in the bullet blank starting from the split end face.

10. The method according to claim 8, wherein the end face of the bullet blank is split starting from a central depression introduced by the graining tool.

11. The method according to claim 8, wherein the central recess is formed by a cylindrical pin which, starting from the split end face, penetrates into the bullet blank up to a specific depth and presses material towards the cylindrical section.

12. The method according to claim 8, wherein the central recess is formed by a cylindrical pin which, starting from the split end face, penetrates into the bullet blank up to the transition from the cylindrical section to the section shaped as a truncated cone and presses material towards the cylindrical section.

13. The method according to claim 10, wherein the central recess is formed by a cylindrical pin which, starting from the split end face, penetrates into the bullet blank up to a specific depth and presses material towards the cylindrical section.

14. The method according to claim 10, wherein the central recess is formed by a cylindrical pin which, starting from the split end face, penetrates into the bullet blank up to the transition from the cylindrical section to the section shaped as a truncated cone and presses material towards the cylindrical section.

15. The method according to claim 8, wherein a bullet mold is closed after the central recess has been formed, wherein the segments are bent over in the direction of a central axis of the bullet to form the channel and the bell-shaped widened region.

16. The method according to claim 8, wherein a bullet mold is closed after the pin has been extracted from the bullet blank, wherein the segments are bent over in the direction of a central axis of the bullet to form the channel and the bell-shaped widened region.

17. The method according to claim 10, wherein a bullet mold is closed after the central recess has been formed, wherein the segments are bent over in the direction of a central axis of the bullet to form the channel and the bell-shaped widened region.

18. The method according to claim 10, wherein a bullet mold is closed after the pin has been extracted from the bullet blank, wherein the segments are bent over in the direction of a central axis of the bullet to form the channel and the bell-shaped widened region.

19. The method according to claim 11, wherein a bullet mold is closed after the central recess has been formed, wherein the segments are bent over in the direction of a central axis of the bullet to form the channel and the bell-shaped widened region.

20. The method according to claim 15, wherein at least one flaw is formed on a mantle surface of the section formed as a truncated cone when the bullet mold is closed.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Other objects and features of the invention will become apparent from the following detailed description considered in connection with the accompanying drawings. It is to be understood, however, that the drawings are designed as an illustration only and not as a definition of the limits of the invention.

(2) In the drawings,

(3) FIG. 1 shows a front view of an expanding bullet;

(4) FIG. 2 shows the section through the expanding bullet along the line A-A in FIG. 1, and

(5) FIG. 3 shows the top view of the expanding bullet shown in FIG. 1.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

(6) The expanding bullet selected as an exemplary embodiment has a single-piece structure. It has a cylindrical section 1 and a section 2 essentially shaped as a truncated cone. The bullet tip 3 is situated at the end of the section 2 shaped as a truncated cone that faces away from the cylindrical section 1. The section 2 shaped as a truncated cone is divided, in the exemplary embodiment, into four segments 4.1 to 4.4, which are brought about by means of incisions 5.1 to 5.4. In the region of the bullet tip 3, the expanding bullet has a mouth 6, which has a star-shaped shape.

(7) The section 2 shaped as a truncated cone has a channel 7, which extends along the longitudinal axis of the expanding bullet. The channel 7 is configured in the manner of a dead-end bore. The channel 7 has a bell-shaped widened region 8, which has its greatest diameter in the region of the transition from the cylindrical section 1 to the section 2 shaped as a truncated cone (see FIG. 2).

(8) In the exemplary embodiment, four flaws 9.1 to 9.4 are situated on the mantle surface of the section 2 shaped as a truncated cone 1. The flaws 9 are the result of the production process. This process can take place in a single massive-forming machine, and thereby transport of the semi-finished products is avoided. The production process is structured as follows:

(9) The expanding bullet is produced from solid material, in the exemplary embodiment from copper wire. Other wire materials are also possible, depending on the application case. In the production of the expanding bullet according to the invention, the wire is first positioned in a forming machine. This can take place from a rolled-up wire coil, in cycled manner. The wire is then cut to length in the forming machine.

(10) After the wire has been cut to length, in the next work step a radius is pressed onto the two end faces of the cut wire. Then one of the two end faces is center-punched. For this purpose, a tool that has a small hard tip is pressed into the end face, whereby a small circular depression is formed. This center-punched end face will later be the centering for the splitting tool. Subsequently, the end face provided with the center punch is split. This results in a crown-like or tulip-like shape, in the case of which four segments that are bent outward are brought about in the exemplary embodiment.

(11) In the next processing step, using a cylindrical pin, material is pressed in the direction of the cylindrical section 1 that will form later. For this purpose, the cylindrical pin penetrates into the wire up to a specific depth from the split side, and pushes the material in front of it, whereby a planned breaking point occurs. After the pin is pulled out of the wire, the bullet shape is closed, whereby the bullet is finished. It then has the form that consists of the cylindrical section 1 and the section 2 essentially shaped as a truncated cone.

(12) As the result of the displacement of the material using the pin, in the split state, a material-free region is formed, which region leads to the bell-shaped widened region 8 after the shape is closed. At the same time, the flaws 9 form on the mantle surface of the section 2 shaped as a truncated cone, when the shape is closed. These flaws lead to a further reduction of the wall thickness of the section 2 shaped as a truncated cone.

(13) The expanding bullet according to the invention is very reliable and, at the same time, can be produced in simple and low-cost manner. High production speeds can be achieved, in particular, in the case of production on a single massive forming machine. As a result, the production costs are further reduced.

(14) Although only a few embodiments of the present invention have been shown and described, it is to be understood that many changes and modifications may be made thereunto without departing from the spirit and scope of the invention.