BULLET

Abstract

The invention relates to a bullet, which comprises a bullet body and a bullet tip, which bullet body of the bullet is a solid body bullet body and made of lead-free metal, advantageously of copper, most advantageously extremely pure copper, which bullet tip of the bullet is made of polymer material, advantageously of POM (polyoxymethylene). The bullet body of the bullet comprises an inner central opening with inner grooves located radially spaced apart at the circumference of the inner central opening. The bullet tip of the bullet comprises a tip end part, tip end grooves and a tip end central bridge, and the bullet tip is located in the inner central opening of the bullet body such, that the tip end part of the bullet tip is outside the bullet body.

Claims

1. A bullet, which comprises a bullet body and a bullet tip, which bullet body of the bullet is a solid body bullet body and made of lead-free metal, which bullet tip of the bullet is made of polymer material, advantageously of POM (polyoxymethylene), which bullet tip of the bullet comprises a tip end part, tip end grooves and a tip end central bridge, wherein the bullet body of the bullet comprises an inner central opening with inner grooves located radially spaced apart at the circumference of the inner central opening, the bullet tip is located in the inner central opening of the bullet body such, that the tip end part of the bullet tip is outside the bullet body, the inner grooves extend a distance in the bullet body, which distance is shorter than the depth of the central opening and the distance is about three times the diameter of the central opening, and the inner grooves have a tapered-like cross section with a rounded end and the tapering angle is 40-50° and the roundup is 0.1-0.3 mm.

2. The bullet according to claim 1, wherein the bullet tip of the bullet is manufactured by injection molding technique.

3. The bullet according to claim 1, wherein the tip end central bridge and the tip end grooves are inclined in view of the center axis line of the bullet tip and inclination angle is 2-2.5°.

4. The bullet according to claim 1, wherein between upper ends of the tip end grooves and outermost surface of the bullet tip has roundups forming ridges, and the roundup is 0.1-0.3 mm and the ridges are of 0.15-0.2 mm of height.

5. The bullet according to claim 1, wherein the bullet tip comprises the tip end part, a cylindrical mid part and a tapered, inner end part and the tapered tip end part is configured to end to a shoulder part.

6. The bullet according to claim 1, wherein the bullet body has a tapered part at the tip end and a substantially cylindrical part forming the other end.

7. The bullet according to claim 5, wherein a common length of the cylindrical middle part of the bullet tip and the tapered bottom end part is less than the depth of the inner central opening of the bullet body.

8. The bullet according to claim 1, wherein the bullet tip is located in the inner central opening of the bullet body such and that the shoulder part of the bullet tip is set against the outermost tip end surface of the bullet body.

9. The bullet according to claim 1, wherein the tip end grooves have a functional length of 2.1-2.15 mm, and the end of the tip end grooves is rounded to radius, which is 1.0-1.4 mm.

10. The bullet according to claim 5, wherein height of the shoulder is about 3.35 mm.

11. The bullet according to claim 1, wherein the bullet body comprises five inner grooves spaced apart at uniform interval.

12. The bullet according to claim 1, the bullet tip comprises three or four tip end grooves spaced apart at uniform interval.

13. The bullet according to claim 1, wherein area of cross sections of the inner grooves is about 17.5% of area of cross section of the central opening.

14. The bullet according to claim 1, wherein the lead-free metal is copper, most advantageously extremely pure copper.

15. The bullet according to claim 4, wherein the roundup is 0.2 mm.

16. The bullet according to claim 4, wherein the ridges are about 0.17 mm of height.

17. The bullet according to claim 9, wherein the functional length of the tip end grooves is about 2.12 mm.

18. The bullet according to claim 9, wherein the radius is about 1.2 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Aspects of the invention, however, together with additional objects and advantages thereof, will be best understood from the following description of some example embodiments when read in connection with the accompanying drawings and in the following the invention is described in more detail referring to the accompanying drawing, in which

[0041] FIG. 1 is schematically shown as a side view an advantageous example of a bullet according to the invention,

[0042] FIG. 2A is schematically shown as an end view the advantageous example of the bullet body of the bullet without a tip end according to FIG. 1,

[0043] FIG. 3 is schematically shown as a tip end partially cut-view an advantageous example of a bullet body of the bullet according to FIGS. 1-2,

[0044] FIG. 4 is schematically shown as a tip end partially cut-view with lower cut than in the FIG. 3 the advantageous example of the bullet body according to FIG. 3 of the advantageous example of the bullet according to FIGS. 1-2,

[0045] FIG. 5 is schematically shown as a cut view the advantageous example of the bullet according to the FIGS. 1-4,

[0046] FIG. 6 is schematically shown as a partial cut view an advantageous example of a bullet tip of the advantageous example of the bullet according to FIGS. 1-5,

[0047] FIG. 7 is schematically shown as a cut view the advantageous example of a bullet tip of the advantageous example of the bullet according to FIGS. 1-6,

[0048] FIG. 8 is schematically shown as a cut view the advantageous example of a bullet tip of the advantageous example of the bullet according to FIGS. 1-7 and

[0049] FIG. 9 is schematically shown as a three-dimensional view the advantageous example of a bullet tip of the advantageous example of the bullet according to FIGS. 1-8.

DETAILED DESCRIPTION

[0050] During the course of the following description like numbers and signs will be used to identify like elements according to the different views which illustrate the invention and its advantageous examples. In the figures some repetitive reference signs may have been omitted for clarity reasons.

[0051] In the FIGS. 1-9 is shown a bullet 10 in accordance with an advantageous example of the invention. The bullet 10 comprises a bullet body 20 and a bullet tip 30. The bullet body 20 is a solid body bullet body and made of lead-free metal, advantageously of copper, most advantageously extremely pure copper, which has high toughness, bending capacity and elongation, for example Cu CW008A. The bullet tip 30 is made of polymer material, advantageously of POM (polyoxymethylene). The bullet tip 30 is advantageously manufactured by injection molding technique.

[0052] The bullet body 20 comprises an inner central opening 22 with inner grooves 21, which are located radially spaced apart at the circumference of the inner central opening 22. The inner grooves 21 extend a distance in the bullet body 20, which distance is shorter than the depth of the central opening 22, advantageously the distance is about three times the diameter of the central opening 22. The diameter of the central opening 22 is advantageously 1-3 mm, more advantageously 1.8-2.8 mm. The inner grooves 21 have advantageously a tapered-like cross section with a rounded end. The tapering angle is advantageously 40-50° and the roundup is advantageously 0.1-0.3 mm.

[0053] Advantageously, the bullet body comprises five inner grooves 21 and they are located spaced apart at uniform interval. The bullet body 20 has a tapered part at the tip end 25 and a substantially cylindrical part 26 forming the other end. Area of the cross section of one inner groove is advantageously 0,145 mm.sup.2 and area of the dross section of the central opening 22 is advantageously 4,155 mm.sup.2. Thus, the area of the cross section of one inner groove 21 is about 3.5% of the area of the cross section of the central opening 22 and the area of the cross sections of the inner grooves 21 about 17.5% of the area of the cross section of the central opening 22. The bottom end of the central opening 22 has a rounding R22, which improves strength of the bullet 10 in higher velocities. The rounding R22 is advantageously 0.6-1.0 mm, more advantageously 0.8 mm.

[0054] The bullet tip 30 comprises a tip end part 35, a cylindrical mid part 36 and a tapered, inner end part 37. The bullet tip 30 further comprises tip end grooves 31 and a tip end central bridge 32. The tip end central bridge 32 and the tip end grooves 31 are inclined in view of the center axis line of the bullet tip 30, advantageously the inclination angle A1 is 2-2.5°. The bullet tip 30 advantageously comprises three or four tip end grooves 31 and they are located spaced apart at uniform intervals.

[0055] The bullet tip 30 is inserted into the inner central opening 22 of the bullet body 20 such that the tip end part 35 of the bullet tip 30 remains outside the bullet body 20 and forms thus the outer tip of the bullet 10. The bullet tip 30 has the tapered tip end part 35 ending to a shoulder part 33, the cylindrical middle part 36 and to opposite direction than the tip end part 35 tapered bottom end part 37. When the bullet tip 30 is placed into the inner central opening of the bullet body 20 the shoulder part 33 is set against the outermost tip end surface of the bullet body 20. The length L1 of the tapered tip end part 35 from the surface of the shoulder 33 to the outermost upper surface of the tapered tip end part 35 of the tip end 30 is advantageously 3.1-3.7 mm, more advantageously about 3.4 mm. The common length of the cylindrical middle part 36 and the tapered bottom end part 37 is less than the depth of the inner central opening 22 of the bullet body. Between the upper ends of the tip end grooves 31 and the outermost surface of the bullet tip 30 has roundups R1 forming ridges, advantageously the roundup R1 is advantageously 0.1-0.3 mm, more advantageously about 0.2 mm. The ridges are advantageously of height L3 0.15-0.2 mm, more advantageously about 0.17 mm. The tip end grooves 31 have a functional length L2, advantageously 2.1 mm-2.15 mm, more advantageously about 2.12 mm. The end of the tip end grooves 31 is rounded to radius R2, which is advantageously 1.0-1.4 mm, more advantageously about 1.2 mm. The height L4 of the shoulder 33 is advantageously 3.1-1.5 mm, more advantageously about 3.35 mm. The bottom end edge of the bottom end part 37 has advantageously a roundup R3 of 0.1-05 mm, more advantageously about 0.3 mm.

[0056] The bullet body 20 of the bullet 10 comprising the inner grooves 21 around the inner central opening 22 speeds up opening of the bullet 10. The dimensioning the inner grooves 22, provides in high velocity tissue impact and the bullet 10 expands rapidly to greater diameter and in low velocity along whole length of the inner grooves 22. Thus, homogenous penetrations of tissue of game is achieved as well as on average higher impact energy such that penetration through a game animal causes a through hole and faster loss of consciousness is contributed.

[0057] The bullet tip 30 of the bullet 10 comprising the grooving formed by the tip end grooves 31 and the tip end central bridge 32, which provides a for low air resistance and that the bullet tip 30 is well air penetrable and mechanically strong.

[0058] The bullet tip 30 of the bullet 10 comprising the grooving formed by the tip end grooves 31 and the tip end central bridge 32, which in view of on average rotational velocity of the bullet 10 and of relative direction of air flow provides that no additional rotational declination, decrease of rotational velocity nor air resistance is caused.

[0059] The bullet tip 30 of the bullet 10 comprising the grooving formed by the tip end grooves 31 and the tip end central bridge 32, which grooving increases deformation velocity of the bullet tip 30, which provides for stronger and faster opening impact from the bullet tip 30 to the bullet body 20 and thus, the bullet 10 expands more rapidly and with lower impact velocities.

[0060] The bullet tip 30 of the bullet 10 has cutting effect formed by the tip end grooves 31 and the tip end central bridge 32, which cutting effect of the bullet tip 30 increases the likelihood of hair unfastening from the hit point, which might be of help in situation after the shot in case the game animal has not immediately been captured.

[0061] The substantially cylindrical part 26 of the bullet body 20 comprises advantageously a relief bevelling formed around the cylindrical part 26 of the bullet body 20 providing for high muzzle velocities and for cost-effective manufacturing as more effective tools can be used and higher cutting speeds can be achieved. The relief bevelling is formed of various grooves, inclinations and straight parts circumventing the cylindrical part 26 of the bullet body 20. Various configurations of the relief bevelling can be used.

[0062] In the description in the foregoing, although some functions have been described with reference to certain features, those functions may be performable by other features whether described or not. Although features have been described with reference to certain embodiments or examples, those features may also be present in other embodiments or examples whether described or not. Above the invention has been described by referring to some advantageous examples only to which the invention is not to be narrowly limited. Many modifications and alterations are possible within the invention as defined in the following claims.