U.S. patent application number 11/882642 was filed with the patent office on 2008-06-19 for rubber shot packing.
This patent application is currently assigned to SALTECH AG. Invention is credited to Christian Kempf.
Application Number | 20080141892 11/882642 |
Document ID | / |
Family ID | 38508832 |
Filed Date | 2008-06-19 |
United States Patent
Application |
20080141892 |
Kind Code |
A1 |
Kempf; Christian |
June 19, 2008 |
Rubber shot packing
Abstract
A rubber shot packing (10) comprises a predetermined or
approximately predetermined number of hard rubber elements (11)
that are arranged in a dense packing. In this case, the hard rubber
elements (11) are altogether surrounded by a plastic film (13).
Such a rubber shot packing (10) is intended for firing as an active
charge with a powder charge that is separate from the active
charge. In this case, at least one disc (20) is arranged, intended
for the insertion side with respect to the powder charge, having an
outside diameter corresponding to the dimensions of the firing cup
and firmly connected to the rubber shot packing (10) axially
centrally in relation to the hard rubber elements (11).
Inventors: |
Kempf; Christian; (Ittigen,
CH) |
Correspondence
Address: |
SUGHRUE MION, PLLC
2100 PENNSYLVANIA AVENUE, N.W., SUITE 800
WASHINGTON
DC
20037
US
|
Assignee: |
SALTECH AG
Dulliken
CH
|
Family ID: |
38508832 |
Appl. No.: |
11/882642 |
Filed: |
August 3, 2007 |
Current U.S.
Class: |
102/502 |
Current CPC
Class: |
F42B 5/03 20130101; F42B
7/046 20130101; F42B 12/74 20130101 |
Class at
Publication: |
102/502 |
International
Class: |
F42B 30/00 20060101
F42B030/00 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 3, 2006 |
CH |
01249/06 |
Claims
1. A rubber shot packing comprising an active charge intended for
firing, and a powder charge that is separate from the active
charge, the active charge comprising a predetermined or
approximately predetermined number of hard rubber elements, wherein
the hard rubber elements are arranged in a dense packing, a plastic
film surrounding altogether the hard rubber elements, and a disc,
intended to be arranged on the insertion side of the packing with
respect to the powder charge, having an outside diameter
corresponding to the dimensions of the firing cup and firmly
connected to the rubber shot packing axially centrally in relation
to the hard rubber elements.
2. The rubber shot packing according to claim 1, wherein the
plastic film also surrounds the disc.
3. The rubber shot packing according to claim 1, wherein the disc
lies on the plastic film and is fastened to the latter or to one of
the hard rubber elements.
4. The rubber shot packing according to claim 1, characterized in
that the disc has a thickness of between 1 and 10 millimetres, with
preference between 3 and 6 millimetres.
5. The rubber shot packing according to claim 1, wherein the disc
is made of a soft plastic, in particular of a PE material, or of a
cardboard material.
6. The rubber shot packing according to claim 1, wherein the disc
is connected to the plastic film by an adhesive and/or by
ultrasonic welding.
7. The rubber shot packing according to claim 1, wherein the
plastic film is a tube, which shrinks in particular when exposed to
heat.
8. The rubber shot packing according to claim 1, wherein a second
additional disc is provided on the side of the packing opposite to
the first disc.
9. The rubber shot packing according to claim 8, wherein the two
discs lie on the plastic film and are fastened to the latter or to
one of the hard rubber elements.
10. The rubber shot packing according to claim 8, characterized in
that the discs have a thickness of between 1 and 10 millimetres,
with preference between 3 and 6 millimetres.
11. The rubber shot packing according to claim 8, wherein the discs
are made of a soft plastic, in particular of a PE material, or of a
cardboard material.
12. The rubber shot packing according to claim 8, wherein the discs
are connected to the plastic film by an adhesive and/or by
ultrasonic welding.
13. The rubber shot packing according to claim 8, wherein the
plastic film is a tube, which shrinks in particular when exposed to
heat.
Description
TECHNICAL FIELD OF THE INVENTION
[0001] The invention relates to a rubber shot packing with the
features of the precharacterizing clause of Claim 1, that is to say
comprising a predetermined or approximately predetermined number of
hard rubber elements that are arranged in a dense packing, the hard
rubber elements altogether being surrounded by a plastic film,
intended for firing as an active charge with a powder charge that
is separate from the active charge.
[0002] Rubber shot according to the invention forms a projectile
for insertion into a cup that is fitted onto an appropriately
equipped firearm. Rubber shot is fired by a propellant charge,
which is loaded in the firearm separately from the packing.
PRIOR ART
[0003] Rubber shot packings according to the precharacterizing
clause of Claim 1 are known from the prior art. In Switzerland,
police forces use such packings, which are fired with a model Tgw
73, which is a carbine with a short barrel and a fitted cup. The
packings that are commonly used at present comprise five layers of
cross-sectionally hexagonal hard rubber projectiles each turned by
30 degrees with respect to one another and held together by a
film.
[0004] It is disadvantageous in this case that gas cutting occurs,
in that the gas generated by the propellant charge forces its way
between the cup and the shrunk-on film at the points at which the
flat sides of the outer hexagonal hard rubber projectiles are
opposite the round wall of the cup. The film has also been produced
from a shrink tube, with the result that the gas also penetrates
into the packing through the lower opening and forces its way
between the individual hard rubber projectiles, which are
consequently separated in advance from one another. The resultant
advantage of the greater scattering effect is offset by the
disadvantage of gas cutting.
[0005] Shot munition packed in a shrink tube is known from the
prior art document U.S. Pat. No. 6,283,037, in which the active
charge packed in this way is separated from the powder charge by a
disc that is arranged within the hull and has an upturned rim
toward both parts of the charge. Such shot munition cannot be used
in the case of a rubber shot packing, since a cup is necessary for
firing, with the result that the active charge and the powder
charge must be loaded separately in spatial and temporal terms.
SUMMARY OF THE INVENTION
[0006] Against the background of this prior art, the invention is
based on the object of developing a rubber shot packing of the type
mentioned at the beginning in such a way that improved firing is
obtained with less gas cutting and at the same time a greater
scattering effect occurs.
[0007] This object is achieved according to the invention by a
rubber shot packing comprising a predetermined or approximately
predetermined number of hard rubber elements, which are arranged in
a dense packing. The term hard rubber element is also understood as
meaning a material of a certain hardness, which in particular may,
for example, also contain a metal core or be in the form of a
mixture containing metal. Instead of metal, other materials that
contribute to a greater density without excessively increasing the
hardness may also be used. In this case, the hard rubber elements
are altogether surrounded by a plastic film. Such a rubber shot
packing is intended for firing as an active charge with a powder
charge separate from the active charge. In this case, at least one
disc is arranged, intended for the insertion side with respect to
the powder charge, having an outside diameter corresponding to the
dimensions of the firing cup and firmly connected to the rubber
shot packing axially centrally in relation to the hard rubber
elements.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] The invention is now described by way of example on the
basis of an exemplary embodiment in conjunction with the drawings,
in which:
[0009] FIG. 1 shows a schematic, partly interrupted side view of a
rubber shot packing according to a first exemplary embodiment of
the invention,
[0010] FIG. 2 shows a schematic, partly interrupted side view of a
rubber shot packing according to a second exemplary embodiment of
the invention,
[0011] FIG. 3 shows a schematic plan view of a rubber shot packing
according to FIG. 2, and
[0012] FIG. 4 shows a perspective view of a hard rubber element of
a rubber shot packing as shown in FIG. 1 or 2.
DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS
[0013] FIG. 1 shows a schematic, partly interrupted side view of a
rubber shot packing 10 according to a first exemplary embodiment of
the invention. The rubber shot packing 10 here comprises, for
example, five layers of hard rubber elements 11. FIG. 4 shows a
perspective view of a hard rubber element 11 of a rubber shot
packing 10 as shown in FIG. 1 or 2. The hard rubber elements 11
according to the exemplary embodiments are hexagonal and the edges
at the top and bottom are rounded off. This allows them to be
placed one against the other without any intermediate spaces, and
seven hard rubber elements 11 form a layer.
[0014] FIG. 3 shows a schematic plan view of a rubber shot packing
10 according to FIG. 2. The uppermost layer of the seven hard
rubber elements 11 can be seen well.
[0015] Between the mutually facing outer sides of two adjacent
outer hard rubber elements 11, in each case a hard rubber element
11 of the layer located thereunder can be seen, the latter layer
being turned by 30 degrees in relation to the uppermost layer. It
is of course also possible to use other forms, for example
cylindrical forms, for the hard rubber elements 11. This applies in
particular to a packing 10 according to the invention such as that
subsequently obtained in conjunction with the discs 20.
[0016] A similar packing density may also be achieved with spheres
as hard rubber elements 11. It is of course also possible to use a
different number of layers. The diameter 12 of the packing 10 in
the case of the illustrated exemplary embodiment is 57 millimetres,
which corresponds to the cup diameter of the gun to be used.
However, other diameters are also possible, both overall, for
example 40 millimetres, and of the individual hard rubber elements
11.
[0017] In the case of the first exemplary embodiment, a disc 20 is
arranged over the first layer of hard rubber elements 11. The disc
20 is a round solid disc and may have, for example, a thickness of
between 1 and 10 millimetres, with preference between 3 and 6
millimetres. It is made of a lightweight material, for example of
cardboard or of preferably comparatively soft plastic, for example
one of the various types of PE or PVC.
[0018] The disc 20 has essentially the inside diameter of the cup.
In the production of the shot packing 10 as shown in FIG. 1, it is
placed onto the layers of the elements 11, centred once at the top
and once at the bottom, and subsequently covered by a film tube 13,
which after shrinkage lies against the shot packing 10 and makes
the latter into an element that can be used as one piece.
[0019] The fact that a tube 13 is used means that essentially round
openings without tube film are obtained at the bottom and top, as
can be seen in FIG. 3, it being assumed that the disc 20 is
transparent.
[0020] Use of the disc 20 on the one hand prevents gas cutting from
occurring between the edges 14 of the hard rubber elements 11
during the firing of the munition. On the other hand, the disc 20
sealing the cup in its diameter also makes it no longer possible
for gas to escape in the transitional spaces 16.
[0021] In principle, it would be possible also to provide just one
disc 20, although the shot packing 10 would then have to be
inserted into the cup of the gun in a directionally oriented
manner, to be specific with the disc facing towards the powder
charge. In order to alleviate the user of the shot packing 10 of
this possibility for error, discs are preferably provided on both
sides of the packing. In order conversely to allow the user of the
shot packing 10 the choice concerning the scattering behaviour, it
is also possible to provide just one disc on one side of the
packing.
[0022] On firing, these discs 20 are on the one hand rapidly
decelerated. On the other hand, tests have shown that, as a result
of the discs 20, the layers of the packing 10 have not been pulled
apart lengthwise, but rather have been distributed widthwise, which
has surprisingly led to a considerably better scattering effect.
The velocity of the hard rubber elements 11 is more uniform.
Consequently, the dangerousness of this non-lethal munition with
respect to serious injuries is yet further reduced. It is adequate
to place the individual hard rubber elements 11 and the discs 20 on
top of one another and to have them held together by the film
13.
[0023] FIG. 2 shows a schematic, partly interrupted side view of a
rubber shot packing 10 according to a second exemplary embodiment
of the invention. Here, the shrink tube 13 has been placed in
advance around the layers of the hard rubber elements 11. Only
subsequently have the two discs 20 then been placed in a centred
manner onto this semifinished shot packing. They have then been
adhesively attached, as shown in FIG. 2, onto the shrink tube 13
and centrally onto the middle hard rubber element. Of course, other
possible means of fastening are also suitable, for instance the
shrink tube 13 may adhesively attach itself to the disc, or the
shrink tube 13 and the plastic disc 20 are welded, for example by
ultrasound. Here, likewise, all that is important is that on the
one hand no gas can pass through the layers through the central
opening of the shrink tube 13 and on the other hand the region
between the outside of the cup and the side of the shrink tube 13
is covered.
[0024] Here it is also advisable to have two discs 20 at the
opposite ends, in order to produce a symmetrical shot packing. In
the case of a more simple exemplary embodiment, in particular if
the disc 20 is of a certain colour that the user immediately
recognizes as the insertion side, it is also possible to use just a
single disc 20.
LIST OF REFERENCE NUMERALS
[0025] 10 rubber shot packing [0026] 11 hard rubber element [0027]
12 diameter [0028] 13 tube film [0029] 14 edge [0030] 16
transitional space [0031] 20 disc
* * * * *