U.S. patent application number 13/216897 was filed with the patent office on 2013-02-28 for training cartridge.
This patent application is currently assigned to UTM IP LIMITED. The applicant listed for this patent is Michael Ernest SAXBY. Invention is credited to Michael Ernest SAXBY.
Application Number | 20130047881 13/216897 |
Document ID | / |
Family ID | 47604474 |
Filed Date | 2013-02-28 |
United States Patent
Application |
20130047881 |
Kind Code |
A1 |
SAXBY; Michael Ernest |
February 28, 2013 |
TRAINING CARTRIDGE
Abstract
A cartridge for non-lethal applications comprises a posterior
portion 1 which extends axially to provide a cylindrical casing. An
anterior portion comprises of a nose portion 2 with a centrally
located recess 8 for receiving a projectile, and an axially
extending piston 3 which is slidably engaged in the chamber defined
by the cylindrical casing 1. A posterior primer 4 is located to the
end of the posterior portion which is most distal to the nose
portion 2. An anterior primer 5 sits just behind the recess 8 of
the nose portion 2. A plastic striker is located in the chamber
defined by the cylindrical casing 1 and comprises of a sealing
flange portion 6 and striking nose portion 7. The striking nose
portion 7 locates snugly but slidably in a second chamber provided
axially within the piston 3. In use, the posterior primer 4
releases gaseous product which drives the striker 7 against the
anterior primer 5 whilst simultaneously causing telescopic
extension of the cartridge which in turn results in recycling of a
host firearm.
Inventors: |
SAXBY; Michael Ernest;
(Eastbourne, GB) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SAXBY; Michael Ernest |
Eastbourne |
|
GB |
|
|
Assignee: |
UTM IP LIMITED
Mildenhall
GB
|
Family ID: |
47604474 |
Appl. No.: |
13/216897 |
Filed: |
August 24, 2011 |
Current U.S.
Class: |
102/444 |
Current CPC
Class: |
F42B 5/045 20130101;
F42B 8/02 20130101 |
Class at
Publication: |
102/444 |
International
Class: |
F42B 8/02 20060101
F42B008/02 |
Claims
1. A cartridge for a firearm for use in non-lethal applications
comprising an anterior portion and a posterior portion, together
providing a recycling mechanism including a moveable member in the
form of a piston or cylinder, slidably engaged respectively with a
cylinder or a piston, a posterior primer located to the rear of the
posterior portion for generating gas within the cartridge, the gas
generated serving in use to propel the moveable member in a
rearward direction against a breech block so as to recycle the
firearm, wherein the anterior portion has a gas channel formed
therethrough and is provided with a nose portion which is suitable
for receiving a projectile, an expansion chamber provided between
the moveable member and the anterior portion, an anterior primer
located in the anterior portion forward of the gas channel, a
percussion element slidably disposed in the gas channel and is
propelled, in use, by gas generated by the posterior primer to
strike against the anterior primer causing initiation, thereby to
cause propulsion of the projectile from the nose portion, said
percussion element comprising a striker composed of a plastic
material, the striker having a rear flanged portion sealably and
slidably disposed in the expansion chamber to prevent gas products
generated by the posterior primer from contacting the anterior
portion.
2. A cartridge as claimed in claim 1, wherein the anterior portion
is formed from a plastic material.
3. A cartridge as claimed in claim 2. wherein the plastic material
is colored consistent with a color coding scheme for identifying
the proper application of the cartridge.
4. A cartridge as claimed in claim 1, wherein the posterior portion
is made of steel.
5. A cartridge as claimed in claim 1, wherein the posterior portion
is made of brass.
6. A cartridge as claimed in claim 1, wherein the posterior portion
provides a cylinder and the anterior portion provides a piston
slidable axially in the cylinder of the posterior portion.
7. A cartridge as claimed in claim 1, further comprising a
projectile disposed in a recess of the nose portion of the anterior
portion.
8. A combination of a cartridge as claimed in claim 1 and a host
firearm, the host firearm being configured for firing the
cartridge.
Description
BACKGROUND OF THE INVENTION
[0001] This invention relates to training cartridges, most
particularly to training cartridges which recycle the host firearm
by telescopic expansion of the cartridge.
[0002] Telescopically expanding training cartridges are known, one
example is described in the applicant's own patent U.S. Pat. No.
6564719 B2. A typical cartridge of the type described in that
patent comprises a posterior portion which has a moveable member
which is slidable rearwardly towards a breech block of a host
firearm. The anterior portion has a gas passage there through and
an expansion chamber is provided between the moveable member and
the anterior portion. Gas generating means for providing gas within
the cartridge are initiatable on firing of the firearm to propel
the moveable member in a rearward direction so as to recycle the
firearm. A second gas generating means is positioned forward of the
gas passage and may be initiated by any suitable reaction caused on
initiation of the posterior primer. For example, the shock or
pressure wave generated on activation of the primer may be
sufficient to initiate the second gas generating means, or
alternatively, activation of the posterior primer may activate a
secondary mechanical or electrical device which serves to initiate
the second gas generating means.
[0003] In the above described prior art cartridges hot, high
pressure gas from the posterior primer enters all of the major
telescopically moving parts of the cartridge. This limits the
choice of materials from which any thin section part of the
cartridge assembly can be manufactured to metals which have
sufficient resistance to these temperatures and pressures.
Consequently, the anterior and posterior portions of the
telescopically expanding recycling mechanism are made almost
entirely of metals.
SUMMARY OF THE INVENTION
[0004] The present invention seeks to provide an alternative design
of cartridge which provides for the use of alternative materials in
the manufacture of the cartridge.
[0005] In accordance with the present invention there is provided a
cartridge for use in non-lethal applications comprising an anterior
portion and a posterior portion, together providing a recycling
mechanism including a moveable member in the form of a piston or
cylinder, slidably engaged respectively with a cylinder or a
piston, a posterior primer located to the rear of the posterior
portion for generating gas within the cartridge, the gas generated
serving in use to propel the moveable member in a rearward
direction against the breech block so as to recycle the firearm,
the anterior portion having a gas channel there through and being
provided with a nose portion which is suitable for receiving a
projectile; an expansion chamber being provided between the
moveable member and the anterior portion, an anterior primer
located in the anterior portion forward of the gas channel, a
percussion means slidably disposed in the gas channel which
percussion means is, in use, propelled by gas generated by the
posterior primer to strike against the anterior primer causing
initiation, thereby to cause propulsion of a projectile from the
nose portion and characterized in that the percussion means
comprises a striker composed of a plastic material, the striker
having a rear flanged portion sealably and slidably disposed in the
expansion chamber whereby to prevent gas products generated by the
posterior primer from contacting the anterior portion.
[0006] Provision of the novel striker makes it possible to provide
the anterior portion of the recycling mechanism from a plastic or
other material which is less robust than a metal. There are
considerable cost savings to be made by the manufacturer if one of
the major telescopically moving parts can be made of plastic rather
than metal. Mass production of the plastic part is far more cost
effective than production of a similar component from metal.
Furthermore there is a consequent and beneficial weight reduction
in the cartridge which reduces costs of transport.
[0007] The plastic striker is used to seal the hot high pressure
gas into the metal case and as it moves to expand the cartridge it
fires the anterior primer before the telescopic recycling of the
cartridge occurs.
[0008] The anterior primer does not produce sufficient pressure to
damage the plastic components as the release of the projectile from
the nose keeps the pressure to a low acceptable level.
[0009] A further advantage of the novel cartridge design is that no
gas or debris from the fired posterior primer is left in the host
firearm or released into the atmosphere near the shooter.
[0010] The anterior primer is desirably made from non toxic
materials and produces little or no debris.
[0011] Plastic materials used for the anterior portion can be
colored enabling cartridges for different purposes to be color
coded.
[0012] The posterior portion is desirably comprised from a brass or
steel providing a centre of gravity of the cartridge close to its
posterior end. This facilitates efficient live round ejection.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] An embodiment of the invention will now be further described
with reference to the accompanying Figure.
[0014] FIG. 1 shows a longitudinal cross section of a cartridge in
accordance with the presently claimed invention.
DETAILED DESCRIPTION
[0015] As can be seen from FIG. 1, a cartridge comprises a
posterior portion 1 which extends axially to provide a cylindrical
casing. An anterior portion comprises of a nose portion 2 with a
centrally located recess 8 for receiving a projectile, and an
axially extending piston 3 which is slidably engaged in the chamber
defined by the cylindrical casing 1. A posterior primer 4 is
located to the end of the posterior portion which is most distal to
the nose portion 2. An anterior primer 5 sits just behind the
recess 8 of the nose portion 2. A plastic striker is located in the
chamber defined by the cylindrical casing 1 and comprises of a
sealing flange portion 6 and striking nose portion 7. The striking
nose portion 7 locates snugly but slidably in a second chamber
provided axially within the piston 3.
[0016] In use, posterior primer 4 is initiated on firing of a host
firearm. Gas product from the posterior primer 4 expands driving
the cylindrical casing in a first axial direction and the striker
6, 7 in an opposing, second axial direction. The striking nose
portion 7 strikes the anterior primer 5 producing gas product which
serves, in use, to propel a projectile (not shown) from the recess
8 in the nose portion 2. Gas product from the posterior primer 4 is
contained by the cylindrical casing 1 and sealing flange portion 6.
The piston 3 and cylinder 1 move in opposing axial directions
telescopically extending the cartridge. Within a host firearm, in
use, the base of the posterior portion 1 encounters the breech of
the firearm and recycles the firearm.
[0017] The posterior portion 1 is manufactured substantially
entirely of metal, typically brass or steel. Since the anterior
portion 2, 3 is protected from the gaseous product and debris of
the posterior primer 4 by sealing flange portion 6, it can be made
substantially entirely from a plastic material providing the
benefits discussed above.
[0018] It will be appreciated that whilst the embodiment
illustrates the posterior portion 1 as a cylinder and the anterior
portion 2, 3 as a piston, the arrangement could readily be reversed
by the skilled addressee without the need to apply inventive
thought and without departing from the scope of the invention as
claimed.
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