U.S. patent application number 12/716859 was filed with the patent office on 2010-09-09 for partial fragmentation bullet.
This patent application is currently assigned to Brenneke GmbH. Invention is credited to Klaus Ripperger, Ralph Wilhelm.
Application Number | 20100224093 12/716859 |
Document ID | / |
Family ID | 42237036 |
Filed Date | 2010-09-09 |
United States Patent
Application |
20100224093 |
Kind Code |
A1 |
Wilhelm; Ralph ; et
al. |
September 9, 2010 |
Partial Fragmentation Bullet
Abstract
A partial fragmentation bullet comprising a nose core, which
forms a fragmenting portion of the partial fragmentation bullet,
and a rear core, which forms a penetration portion of the partial
fragmentation bullet. The nose core and the rear core are made of
materials having the same level of hardness. This level of hardness
is in the Brinell hardness range.
Inventors: |
Wilhelm; Ralph; (Hannover,
DE) ; Ripperger; Klaus; (Isernhagen, DE) |
Correspondence
Address: |
ROBERT W. BECKER & ASSOCIATES
707 HIGHWAY 333, SUITE B
TIJERAS
NM
87059-7507
US
|
Assignee: |
Brenneke GmbH
Langenhagen
DE
|
Family ID: |
42237036 |
Appl. No.: |
12/716859 |
Filed: |
March 3, 2010 |
Current U.S.
Class: |
102/507 ;
102/519 |
Current CPC
Class: |
F42B 12/74 20130101;
F42B 12/34 20130101 |
Class at
Publication: |
102/507 ;
102/519 |
International
Class: |
F42B 12/34 20060101
F42B012/34 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 3, 2009 |
DE |
10 2009 011 093.3 |
Claims
1. A partial fragmentation bullet (1), comprising: a nose core (2),
wherein said nose core forms a fragmenting portion of said partial
fragmentation bullet (1); and a rear core (3), wherein said rear
core forms a penetration portion of said partial fragmentation
bullet (1), further wherein said nose core (2) and said rear core
(3) are made of materials having the same level of hardness, and
wherein said level of hardness is in the Brinell hardness
range.
2. A partial fragmentation bullet according to claim 1, wherein
said level of hardness of said nose core (2) and said rear core (3)
is a maximum Brinnel hardness of 200.
3. A partial fragmentation bullet according to claim 2, wherein
said nose core (2) and said rear core (3) are made of the same
materials.
4. A partial fragmentation bullet according to claim 3, wherein
said nose core (2) and said rear core (3) are made of tin.
Description
[0001] The instant application should be granted the priority date
of Mar. 3, 2009, the filing date of the corresponding German patent
application 10 2009 011 093.3.
BACKGROUND OF THE INVENTION
[0002] The present invention relates to a partial fragmentation
bullet for hunting purposes.
[0003] Modern rifle projectiles or bullets must satisfy various
hunting-related requirements. The most important of these
requirements is the target precision, i.e. the firing precision
from various hunting weapons. Furthermore, the game is to be killed
rapidly and without great agony. For this purpose, it is necessary
that the bullet has a spreading effect and a depth effect in the
body of the game. To fulfill this requirement, the bullet should
fragment in the body of the game, and at the same time should
retain a defined residual mass. This is achieved by a separation
into two cores. A further requirement of modern rifle bullets is a
formation of cut hair and blood at the entry wound in order to
facilitate a possible search for a wounded animal, even where there
is no exit wound. Since due to the elasticity of the fur coat, the
skin, and the fat layer disposed below it, the point of entry
frequently closes very rapidly, so that it is desirable to have an
exit wound with the formation of blood, even when the firing angle
is not favorable.
[0004] Coming very close to these requirements are the rifle
projectiles that are attributable to the assignee of the present
application and that are known world-wide under the trademark TUG
(Torpedo-Universal-Geschoss [=projectile]) and TIG
(Torpedo-Ideal-Geschoss [=projectile]). These projectiles have
their origin in a hunting bullet patented for the founder of the
assignee, Wilhelm Brenneke, on 11 Dec. 1920, by the German Patent
Office under the number 370 908.
[0005] These projectiles are partial fragmentation projectiles
having a casing or jacket of nickel-plated low-carbon or ingot
steel that in a form-locking manner receives two lead cores, namely
a softer nose core and a harder rear core. These projectiles obtain
their name due to their base or bottom, which in the rear has a
torpedo shape. These bases have interior ballistic advantages. The
dual-core construction of the above-mentioned. Brenneke rifle
bullets provide for an optimum release of energy in the target with
a reliable spreading and depth effect. This occurs due to the
rapidly occurring deformation and fragmentation of the front, soft
lead core, while the rear, hard lead core in most cases leads to
the desired exit wound. Characteristic for the TIG and TUG
projectiles is a sharp edge that is formed in the region of the
head of the projectile and that in most instances delivers cut hair
and blood to the entry wound.
[0006] This line of development of the aforementioned type of
partial fragmentation projectiles, i.e. with a soft nose core and a
hard rear core, was maintained over nearly 100 years. Evidence of
this is also a partial fragmentation projectile patented in 2007
(EP 1 214 560 B1). Involved here is a projectile that is free of
lead. Proposed as metallic materials for these projectiles are
copper, tin, zinc, iron, tungsten, titanium, silver, aluminum,
tantalum, vanadium, and alloys of these metals.
[0007] It is an object of the present invention to provide an
improved partial fragmentation bullet of the aforementioned general
type that has a dual-core construction.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] This object, and other objects and advantages of the present
application, will appear more clearly from the following
specification in conjunction with the accompanying schematic
drawings, in which:
[0009] FIG. 1 is a longitudinal section through a first exemplary
embodiment of an inventive partial fragmentation bullet,
[0010] FIG. 2 is a longitudinal section through a second exemplary
embodiment of an inventive partial fragmentation bullet,
[0011] FIG. 3: is a longitudinal section through a third exemplary
embodiment of an inventive partial fragmentation bullet,
[0012] FIG. 4: is a longitudinal section through a fourth exemplary
embodiment of an inventive partial fragmentation bullet,
[0013] FIG. 5: is a longitudinal section through a fifth exemplary
embodiment of an inventive partial fragmentation bullet, and
[0014] FIG. 6: is a longitudinal section through a sixth exemplary
embodiment of an inventive partial fragmentation bullet.
SUMMARY OF THE INVENTION
[0015] The partial fragmentation bullet of the present application
comprises a nose core, which forms a fragmenting portion of the
partial fragmentation bullet, and a rear core, which forms a
penetration portion of the partial fragmentation bullet; the nose
core and the rear core are made of materials having the same level
of hardness or hardness value, with such level of hardness being in
the Brinell hardness range (HBW). Thus, the partial fragmentation
bullet of the present application breaks with the concept that was
accepted and practiced for many decades, and which states that the
nose core of partial fragmentation bullets must be softer than the
rear core. However, with the partial fragmentation bullet of the
present application, it has been surprisingly shown that it is also
possible with nose cores and rear cores that have the same hardness
to achieve the desired interior ballistics of bullets, namely a
mushrooming and fragmentation of the nose core as well as an exit
wound in most instances.
[0016] The solution of the present application makes it possible,
pursuant to one advantageous embodiment of the invention, to use
the same materials for the nose core and for the rear core, which
results in considerable advantages in fabrication techniques during
the manufacture of the bullet.
[0017] Pursuant to one advantageous embodiment of the present
invention, the nose core and the rear core are made of tin.
[0018] When using materials for the rear core and the nose core
having greater hardness values of up to 200 HBW it can be
advantageous to provide mushrooming aids to enhance the mushrooming
of the nose core. Such mushrooming aids can be in the form of
hollow tips, through-bores that extend through the nose core in the
longitudinal direction, or blind holes in which expanding bodies
are placed.
[0019] Further specific features of the present application will be
described in detail subsequently.
DESCRIPTION OF SPECIFIC EMBODIMENTS
[0020] Referring now to the drawings in detail, the partial
fragmentation projectile or bullet 1 shown in FIG. 1 corresponds in
principle to the construction of assignee's known TIG-projectile,
while the partial fragmentation projectile or bullet 1 shown in
FIG. 4 corresponds in principle to the construction of assignee's
known TUG-projectile. Accordingly, the two partial fragmentation
bullets 1 of FIGS. 1 and 2 have a dual-core construction comprised
of a nose core 2 and a rear core 3. Furthermore, common to both of
these partial fragmentation bullets 1 is a bullet casing or jacket
4 (partial jacket projectile or bullet) that is open at the tip of
the nose; the thickness of the jacket 4 increases from the tip of
the bullet toward the rear. Characteristic of both of the partial
fragmentation bullets 1 is furthermore a sharp edge 5, which during
entry of the bullet punches or forms a circular hole and thus
delivers cut hair and blood to the entry wound or point of impact,
and also a torpedo-rear 6 that results in interior ballistic
advantages due to its bottom shape. Further, common features of the
partial fragmentation bullets 1 of FIGS. 1 and 4 include
circumferential retention grooves 7 and crimping grooves 8, which,
however, are differently shaped with the two partial fragmentation
bullets 1 yet have the same function. The retention grooves 7, as
their name already implies, serve to retain or hold the rear core 3
against the bullet jacket 4, while the crimping grooves 8 serve for
the establishment of a crimp connection between a non-illustrated
cartridge or round casing and the partial fragmentation bullet
1.
[0021] With the partial fragmentation bullet 1 of FIG. 1, the end
at the nose side of the rear core 3 is provided with a
funnel-shaped recessed area 9, into which a correspondingly shaped
pin 10 of the nose core 2 engages in a positive or form-locking
manner. Both the nose core 2 and the rear core 3 are made of
tin.
[0022] When the partial fragmentation bullet 1 of FIG. 1 strikes
the body of game, the nose core 2 mushrooms and at the same time
the pin 10 of the nose core 2 penetrates into the rear core 3, so
that this rear core is also splayed open, i.e. its cross-section
increases. In this connection, the bullet jacket 4 remains
connected to the rear core 3. Due to the great expansion of the
cross-section of the partial fragmentation bullet 1, a significant
shock effect is caused in the body of the game, so that the animal
quickly perishes. At the same time, the rear core 3, which does not
fragment, in most instances provides for an exit wound in light and
middle-weight game.
[0023] The target ballistics of the partial fragmentation bullet 1
of FIG. 4 differs from that of the target fragmentation bullet 1 of
FIG. 1. This is primarily brought about in that with the partial
fragmentation bullet 1 of FIG. 4, the front portion of the rear
core 3 extends into the nose core 2 by means of a cone-shaped tip
3. The nose core 2 rests against the rear core 3 in a positive or
form-locking manner via a corresponding cone-shaped recessed area
12.
[0024] When the partial fragmentation bullet 1 of FIG. 4 strikes
the body of game, the nose core 2 mushrooms before it fragments, so
that due to the increase in cross-sectional area, again a shock
effect is achieved in the body of the game. Due to this
mushrooming, the bullet jacket 4 separates at the crimping groove
8. Due to its cone-shaped tip 11, the rear core 3 essentially
experiences no increase in cross-section, so that the partial
fragmentation bullet 1 of FIG. 4 as a rule provides for an exit
wound, even with heavier game.
[0025] The partial fragmentation bullets 1 of FIGS. 2 and 3 and
FIGS. 5 and 6 differ from the partial fragmentation bullet of FIG.
1 and of FIG. 4 respectively in that they are provided with
mushrooming aids. Such mushrooming aids are particularly required
when metallic materials having greater hardness values are
used.
[0026] With the partial fragmentation bullets 1 of FIGS. 2 and 5,
the mushrooming aid is in the form of a thin through-bore 13 that
extends centrally through the nose core 2 from the front to the
rear.
[0027] With the embodiment of FIGS. 3 and 6, the nose core 2 has a
blind hole 14 that opens into the tip and expands in a conical
manner at the opening. An expanding body 15 of a harder material,
which forms the tip of the partial fragmentation bullet 1, is
inserted into the blind hole 14. A shaft 15.1 of the expanding body
15 extends into the blind hole 14. At the shaft 15.1, a conical
expansion, which corresponds to the expansion of the blind hole 14,
adjoins the shaft 15.1 at the transition to the tip of the bullet.
The connection between the expanding body 15 and the nose core 2 is
established by a positive material connection.
[0028] The specification incorporates by reference the disclosure
of German priority document 10 2009 011 093.3 filed 3 Mar.
2009.
[0029] The present invention is, of course, in no way restricted to
the specific disclosure of the specification and drawings, but also
encompasses any modifications within the scope of the appended
claims.
* * * * *