U.S. patent application number 14/894382 was filed with the patent office on 2016-05-05 for muzzle brake and firearm.
The applicant listed for this patent is Hiromi MAEDA. Invention is credited to Hiromi MAEDA.
Application Number | 20160123689 14/894382 |
Document ID | / |
Family ID | 50202784 |
Filed Date | 2016-05-05 |
United States Patent
Application |
20160123689 |
Kind Code |
A1 |
MAEDA; Hiromi |
May 5, 2016 |
MUZZLE BRAKE AND FIREARM
Abstract
A muzzle brake as an exemplary muzzle brake has an inner tubular
portion, an outer tubular portion, and a lid portion. A tip portion
of a gun barrel is fixed to the inside of the inner tubular
portion. A space is formed inside the inner tubular portion on an
extension of a muzzle. A plurality of first gas-guiding holes is
formed in the vicinity of the muzzle. A fired gas passes through
the first gas-guiding holes from the muzzle, and is guided to the
space between the inner tubular portion and the outer tubular
portion.
Inventors: |
MAEDA; Hiromi; (Koga-shi,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MAEDA; Hiromi |
Koga-shi |
|
JP |
|
|
Family ID: |
50202784 |
Appl. No.: |
14/894382 |
Filed: |
May 29, 2013 |
PCT Filed: |
May 29, 2013 |
PCT NO: |
PCT/JP2013/064850 |
371 Date: |
November 27, 2015 |
Current U.S.
Class: |
89/14.3 |
Current CPC
Class: |
F41A 21/36 20130101;
F41A 21/30 20130101 |
International
Class: |
F41A 21/36 20060101
F41A021/36 |
Claims
1. A muzzle brake, comprising: a substantially tubular inner wall
portion having a first hole formed therein and in which a muzzle of
a gun barrel that is inserted into the inner wall portion is
located adjacent to the first hole and is capable of being fixed
thereto; an outer wall portion substantially surrounding the inner
wall portion; a first blocking portion arranged closer to a
location into which the gun barrel is inserted than a location
where the first hole is formed, and configured to block a clearance
between the inner wall portion and the outer wall portion; a second
blocking portion arranged more opposite to the first blocking
portion than the location where the first hole is formed, and
configured to block the clearance between the inner wall portion
and the outer wall portion; a substantially tubular piston which is
movable in a state where an area between the first hole and the
first blocking portion comes in contact with the inner wall portion
and the outer wall portion; and a piston-receiving member with an
elasticity arranged between the piston and the first blocking
portion and being movable in the area between the first hole and
the first blocking portion.
2. The muzzle brake according to claim 1, wherein the piston is
rotatable, and a center of gravity is biased in the piston.
3. The muzzle brake according to claim 1, further comprising a
protruding portion located between the first hole and the piston,
and protruding from the inner wall portion toward the outer wall
portion.
4. The muzzle brake according to claim 1, wherein the first
blocking portion has a first openable and closable opening
portion.
5. The muzzle brake according to claim 1, wherein the outer wall
portion has a second hole formed on a peripheral surface thereof
and in an at least part of the area where the piston is movable,
and comprises: a guiding outer wall portion substantially
surrounding the outer wall portion; a third blocking portion
located more closer to the location into which the gun barrel is
inserted than a location where the second hole is formed, and
configured to block a clearance between the outer wall portion and
the guiding outer wall portion; a fourth blocking portion located
more opposite to the third blocking portion than the location where
the second hole is formed, and configured to block the clearance
between the outer wall portion and the guiding outer wall portion;
a second openable and closable opening formed in the third blocking
portion; a third hole formed in the fourth blocking portion; and a
partition portion having a fourth hole formed in at least a part
thereof, and configured to block the clearance between the outer
wall portion and the guiding outer wall portion.
6. The muzzle brake according to claim 5, wherein the muzzle brake
comprises a plurality of the partition portions, and wherein the
neighboring partition portions are different from each other in an
arrangement of the fourth hole in a plane which is substantially
perpendicular to a lengthwise direction of the guiding outer wall
portion.
7. A muzzle brake, comprising: a substantially tubular inner wall
portion having a first hole and a second hole spaced apart from the
first hole, and in which a muzzle of a gun barrel that is inserted
into the inner wall portion is located adjacent to the second hole
and is capable of being fixed thereto; an outer wall portion
substantially surrounding the inner wall portion; a first blocking
portion arranged more opposite to a location into which the gun
barrel is inserted than a location where the first hole is formed,
and configured to block a clearance between the inner wall portion
and the outer wall portion; a second blocking portion arranged
closer to the location into which the gun barrel is inserted than a
location where the second hole is formed, and configured to block
the clearance between the inner wall portion and the outer wall
portion; and a protruding portion located at the first hole
adjacent the second hole on a peripheral surface of the inner wall
portion and protruding from the inner wall portion toward the outer
wall portion.
8. A firearm, comprising: a gun barrel having a gun barrel hole
formed in an area thereof adjacent to a muzzle, and a muzzle brake,
which comprises: a substantially tubular inner wall portion having
a first hole formed in an area thereof corresponding to the gun
barrel hole, wherein the gun barrel is capable of being fixed to an
inside of the inner wall portion; an outer wall portion
substantially surrounding the inner wall portion and having a
second hole formed closer to a location into which the gun barrel
is inserted than a location where the first hole is formed; a first
blocking portion arranged closer to the location into which the gun
barrel is inserted than the location where the first hole is
formed, and configured to block a clearance between the inner wall
portion and the outer wall portion; a second blocking portion
arranged more opposite to the first blocking portion than the
location where the first hole is formed, and configured to block
the clearance between the inner wall portion and the outer wall
portion; a guiding outer wall portion substantially surrounding the
outer wall portion; a third blocking portion located more closer to
the location into which the gun barrel is inserted than a location
where the second hole is formed, and configured to block a
clearance between the outer wall portion and the guiding outer wall
portion; a fourth blocking portion located more opposite to the
third blocking portion than the location where the second hole is
formed, and configured to block the clearance between the outer
wall portion and the guiding outer wall portion; a third hole
formed in the fourth blocking portion; and a partition portion
having a fourth hole formed in at least a part thereof, and
configured to block the clearance between the outer wall portion
and the guiding outer wall portion.
9. The muzzle brake according to claim 2, further comprising a
protruding portion located between the first hole and the piston,
and protruding from the inner wall portion toward the outer wall
portion.
10. The muzzle brake according to claim 2, wherein the first
blocking portion has a first openable and closable opening portion.
Description
TECHNICAL FIELD
[0001] The present invention relates to muzzle brake and a firearm.
In particular, the invention relates to a muzzle brake and firearm
which can reduce efficiently the influence of the gas at the time
of firing.
BACKGROUND ART
[0002] A gunnery such as a gun and an artillery fires a bullet from
a gun barrel using the pressure of the combustion gas of a
gunpowder. At the time of firing a bullet, the powerful gas
pressure inside a gun barrel generates the repercussion toward a
shooter as well as the reaction posteriorly acting on the gun.
[0003] Moreover, due to the repercussion caused by the gas the of
the gun raises upward, thereby leading to a phenomenon called a
"muzzle jump" in which a muzzle of a gun turns up. Due to the
repercussion caused by the gas the gun retreats to hit the shoulder
of the shooter, thereby inflicting a physical pain or injury on the
shooter. The accuracy of fire at the time of firing is also
reduced. Furthermore, an influence may be exerted on the shooting
posture of the following bullet.
[0004] For the above reasons, a muzzle brake for reducing the
repercussion caused by the gas at the time of firing is attached at
the tip of a gun or an artillery. The muzzle brake has a tubular or
box-shaped contour, and vents the gas to an atmosphere through a
hole formed in the side face thereof to decrease the repercussion.
Such muzzle brake has been proposed by, for example, Patent
Document 1
[0005] Patent Document 1 discloses a muzzle brake 100 as shown in
FIG. 6. The muzzle brake 100 consists of a first main body 101 and
a second main body 102. Both of them are cylindrically formed.
Moreover, a plurality of through-holes is formed in the periphery
of the first main body 101 and the second main body 102.
[0006] Moreover, the muzzle brake 100 is attachable to a gun
barrel. Although muzzle brake 100 is a device for a gun barrel, a
basic configuration where the through-hole is formed is common in
the muzzle brake which is mountable to a gun.
[0007] Moreover, devices such as a flash hider which suppresses a
firing flash and a silencer which suppresses a firing sound have a
configuration similar to the muzzle brake. These are attached at
the tip of a gun barrel like the muzzle brake, and is operable with
the through-hole and an internal space.
CITATION LIST
Patent Literature
[0008] [PLT 1]
[0009] Japanese Patent Publication H10-300392(A)
SUMMARY OF INVENTION
Technical Problem
[0010] The muzzle brake as disclosed in Patent Document 1 diffuses
the gas through the through-hole to the atmosphere to reduce the
repercussion. However, a part of gas diffused from the muzzle of a
gun creates the pressure which pushes a gun barrel back, and
sufficient repercussion suppressive effect cannot be thus
obtained.
[0011] Although a part of gas is diffused, all of the gas used for
firing cannot be diffused immediately. Due to the action of the gas
remaining in the gun barrel, the repercussion to a gun barrel
easily occurs.
[0012] Moreover, the gas diffused from the through-hole may be
reflected by the wall of a building, a ground, and etc. thereby
blurring a gun barrel. Due to the blur of the gun barrel, the
positon of the gun muzzle become unstable, and accuracy of fire
will thus falls.
[0013] Moreover, the firing sound easily spreads around through the
through-hole formed in the side surface and become loud. If the
firing sound becomes loud, a shooter is not only exposed to the
loud sound, and the location of the shooter is recognized.
[0014] As the gas is diffused through a plurality of the
through-holes, disturbance of the fired gas may occur, thereby
affecting the course of a bullet, and falling the accuracy of fire.
Furthermore, the gas diffused through the through-hole facing the
ground side raises a soil or a cloud of dust, and interrupts the
view of the shooter.
[0015] Although the flash hider that is mounted to the gun barrel
may have a function of the muzzle brake, the firing flash is
discharged through the plurality of through-holes, which may be a
danger of doing a damage to the surrounding human being.
[0016] Moreover, the silencer guides the gas from the gun barrel,
accumulates the gas in a plurality of air chambers which is formed
by the division of the interior of a main body, reduces a pressure,
and then diffuse the gas. However, the consumption of an inner
member such as a partition plate, caused by the pressure of gas is
remarkable, and the partition plate should be exchanged
frequently.
[0017] In order to overcome the above drawbacks and problems, the
invention provides a muzzle brake and firearm which can reduce
efficiently the influence of the gas at the time of firing.
Solution to Problem
[0018] In order to attain the above objective, in one aspect of the
invention, a muzzle brake is provided with a substantially tubular
inner wall portion having a first hole formed therein and in which
a muzzle of a gun barrel that is inserted into the inner wall
portion is located adjacent to the first hole and is capable of
being fixed to the inner wall portion; an outer wall portion
substantially surrounding the inner wall portion; a first blocking
portion arranged closer to a location into which the gun barrel is
inserted than a location where the first hole is formed, and
configured to block a clearance between the inner wall portion and
the outer wall portion; a second blocking portion arranged more
opposite to the first blocking portion than the location where the
first hole is formed, and configured to block a clearance between
the inner wall portion and the outer wall portion; a substantially
tubular piston which is movable in a state where an area between
the first hole and the first blocking portion comes in contact with
the inner wall portion and the outer wall portion; a
piston-receiving member with an elasticity arranged between the
piston and the first blocking portion and being movable in the area
between the first hole and the first blocking portion.
[0019] In this regard, by virtue of the substantially tubular inner
wall portion which the gun barrel can be inserted into and then
fixed to, the muzzle brake can be mounted to the gun barrel.
[0020] Moreover, by virtue of the inner wall portion having the
first hole formed therein and in which the muzzle of the gun barrel
that is inserted into the inner wall portion is located adjacent to
the first hole and is capable of being fixed to the inner wall
portion, the gas generated at the time of firing can easily flow to
the first hole. As such, the gas can be guided from the muzzle and
the inner all portion to the first hole.
[0021] Moreover, the outer wall portion substantially surrounding
the inner wall portion can surround the gun barrel and the inner
wall portion so as to form the space between the inner wall portion
and the outer wall portion. In other words, the gas generated at
the time of firing can be guided to and temporarily held in this
space.
[0022] Moreover, since the second blocking portion is arranged more
opposite to the first blocking portion than the location where the
first hole is formed to block the clearance between the inner wall
portion and the outer wall portion, the repercussion caused by the
pressure of the gas diffused outside and of pushing the gun barrel
and the muzzle brake posteriorly can be reduced. In other word, the
second blocking portion receives or take the pressure of the gas
diffused outside and the pressure of the fired gas guided from the
first hole to offset and reduce the repercussion caused by the gas
diffused outside.
[0023] Moreover, since the second blocking portion is arranged more
opposite to the first blocking portion than the location where the
first hole is formed to block the clearance between the inner wall
portion and the outer wall portion, it can block a location or side
opposite to a side or location where the gun barrel is inserted
into the space between the inner wall portion and the outer wall
portion, thereby allowing the gas to be held in the space. In other
words, the gas is held in the space without being diffused outside,
thereby gradually reducing the pressure of the gas.
[0024] Moreover, by virtue of the substantially tubular piston
which is movable in a state where an area between the first hole
and the first blocking portion comes in contact with the inner wall
portion and the outer wall portion, the gas diffusing from the
first hole toward the first blocking portion can be taken or
received. In other words, the pressure caused by the surplus gas
which cannot be settled or received in the space adjacent to the
second blocking portion can be taken or received, thereby allowing
for the reduction of the repercussion.
[0025] Moreover, by virtue of the substantially tubular piston
which is movable in a state where an area between the first hole
and the first blocking portion comes in contact with the inner wall
portion and the outer wall portion, the piston is pressed or pushed
by the pressure of the gas to move. As a result, the volume of the
space which can hold the gas therein is enlarged or increased. In
other words, a greater amount of the gas can be held inside the
muzzle brake, and the repercussion caused by the gas can be
reduced.
[0026] Moreover, by virtue of a substantially tubular piston which
is movable in a state where an area between the first hole and the
first blocking portion comes in contact with the inner wall portion
and the outer wall portion, the positon of the gun barrel can be
stabilized. In other words, the piston which is pushed by the
pressure of the gas moves in a direction substantially parallel to
the gun barrel to reduce a blur of the gun barrel caused by the
repercussion of the gas, as well as maintain the position of the
gun barrel.
[0027] Moreover, by virtue of the piston-receiving member with
elasticity arranged between the piston and the first blocking
portion and being movable in the area between the first hole and
the first blocking portion, grater pressure can be taken or
received by the piston. In other words, the piston-receiving member
can be contracted to receive the piston or push back the
piston.
[0028] Moreover, by virtue of the piston-receiving member with an
elasticity arranged between the piston and the first blocking
portion and being movable in the area between the first hole and
the first blocking portion, the piston and the piston-receiving
member can move in a state where they are pushed by the pressure of
the gas, thereby enlarging or increasing the volume of the space
for holding the gas therein. In other words, a greater amount of
the gas can be held in the muzzle brake, thereby reducing the
repercussion caused by the gas.
[0029] Moreover, by virtue of the first blocking portion arranged
closer to a location into which the gun barrel is inserted than a
location where the first hole is formed, and configured to block a
clearance between the inner wall portion and the outer wall
portion, the piston-receiving member which moves due to the
pressure of the gas can be stopped or blocked. In other words, the
piston-receiving member which is pushed by the pressure of the gas
can contract or extend.
[0030] Moreover, in a case where the piston is rotatable, and a
center of gravity is biased in the piston, the center of gravity of
the piston can be always maintained in a perpendicular and downward
direction even when the direction or orientation of the gun barrel
is changed or modified in a circumferential direction. In other
words, when the gun is fired in an inclined manner, the above
configuration can sufficiently mitigate the phenomenon that due to
the repercussion of the gas the gun barrel raises upward.
[0031] Moreover, in a case where the muzzle brake is provided with
a protruding portion which is located between the first hole and
the piston, and protrudes from the inner wall portion toward the
outer wall portion, the piston is prevented from moving toward the
second blocking portion rather than the first hole. In other words,
the gas is hit by the piston at the first blocking portion side
rather than the first hole side, thereby allowing the piston to
securely move toward the gun barrel.
[0032] Moreover, in a case where the first blocking portion has a
first openable and closable opening portion, the space formed
between the inner wall portion and the outer wall portion can be
opened at the first blocking portion side. In other words, when the
piston and the piston-receiving member are exhausted, they can be
easily exchanged.
[0033] Moreover, in a case where the second hole is formed on a
peripheral surface (i.e., an outer periphery) of the outer wall
portion and in an at least part of an area where the piston is
movable, a part of the gas pushing the piston toward the first
blocking member can be guided from the space between the inner wall
portion and the outer wall portion to the second hole. In other
words, the surplus gas can be further diffused to the second
hole.
[0034] Moreover, in a case where the muzzle brake is provided with
a guiding outer wall portion substantially surrounding the outer
wall portion, it can surround the gun barrel, the inner wall
portion and the outer wall portion so as to form the space between
the guiding outer wall portion and the outer wall portion. In other
words, the gas created at the time of firing can be further guided
to and temporarily held in this space.
[0035] Moreover, in a case where the muzzle brake is provided with
a third blocking portion located more closer to the location into
which the gun barrel is inserted than a location where the second
hole is formed, and configured to block a clearance between the
outer wall portion and the guiding outer wall portion, the location
or side into which the gun barrel is inserted in the space between
the outer wall portion and the guiding outer wall portion can be
blocked, and the gas can be thus held in the space. In other word,
the gas can be held in the space without being diffused outside,
thereby gradually reducing the pressure.
[0036] Moreover, in a case where the muzzle brake is provided with
a fourth blocking portion located more opposite to the third
blocking portion than a location where the second hole is formed,
and configured to block a clearance between the outer wall portion
and the guiding outer wall portion, and the third hole formed in
the fourth blocking portion, the gas can be guided into the space
formed between the outer wall portion and the guiding outer wall
portion, and simultaneously discharged outside through the third
hole. In other words, the gas can be ultimately diffused outside
while reducing the pressure of the gas.
[0037] Moreover, in a case where the muzzle brake is provided with
a partition portion having a fourth hole formed in at least a part
thereof, and configured to block a clearance between the outer wall
portion and the guiding outer wall portion, the gas can be guided
through the fourth hole into the space arranged in the partition
portion. In other words, by increasing a period of time needed to
move the gas, the gas can be easily cooled, and the pressure of the
gas can be further reduced.
[0038] Moreover, in a case where the muzzle brake is provided with
a plurality of the partition portions, a period of time needed to
move the gas is increased, thereby sufficiently cooling the
gas.
[0039] Moreover, in a case where the muzzle brake is provided with
a plurality of the partition portions, and the neighboring
partition portions are different from each other in an arrangement
of the fourth hole in a plane which is substantially perpendicular
to a lengthwise direction of the guiding outer wall portion, the
cooling effect of the gas can be further enhanced. In other words,
the location or arrangement of the fourth hole through which the
gas passes is different between the partition portions, and the gas
should move to the location of the fourth hole in each partition
portions, thereby increasing a period of time needed for the
movement.
[0040] Moreover, in a case where the muzzle brake is provided with
a second openable and closable opening formed in the third blocking
portion, the space formed between the outer wall portion and the
guiding outer wall portion can be opened at the third blocking
portion side. In other words, when the partition portion arranged
in the space is exhausted, it can be easily exchanged.
[0041] In order to attain the above objective, in another aspect of
the invention, a muzzle brake is provided with a substantially
tubular inner wall portion having a first hole and a second hole
spaced apart from the first hole, and in which a muzzle of a gun
barrel that is inserted into the inner wall portion is located
adjacent to the second hole and is capable of being fixed to the
inner wall portion; an outer wall portion substantially surrounding
the inner wall portion; a first blocking portion arranged more
opposite to the location into which the gun barrel is inserted than
a location where the first hole is formed, and configured to block
a clearance between the inner wall portion and the outer wall
portion; a second blocking portion arranged closer to the location
into which the gun barrel is inserted than a location where the
second hole is formed, and configured to block a clearance between
the inner wall portion and the outer wall portion; and a protruding
portion located at the first hole adjacent the second hole on a
peripheral surface of the inner wall portion and protruding from
the inner wall portion toward the outer wall portion.
[0042] By virtue of the substantially tubular inner wall portion in
which the muzzle of the gun barrel that is inserted into the inner
wall portion is located adjacent to the second hole and is capable
of being fixed to the inner wall portion, the muzzle brake can be
mounted to the gun barrel.
[0043] By virtue of the second hole, and the inner wall portion in
which a muzzle of a gun barrel that is inserted into the inner wall
portion is located adjacent to the second hole and is capable of
being fixed the inner wall portion, the gas generated at the time
of firing can easily flow to the second hole. As such, the gas can
be guided from the muzzle and inner wall portion to the second
hole.
[0044] By virtue of the outer wall portion substantially
surrounding the inner wall portion, the outer wall portion can
surround the gun barrel and the inner wall portion to form a space
between the inner wall portion and the outer wall portion. In other
words, the gas generated at the time of firing can be guided to and
temporarily held in this space.
[0045] Moreover, by virtue of the inner wall portion having the
first hole and the second hole spaced apart from the first hole,
and the outer wall portion substantially surrounding the inner wall
portion, the gas having been guided from the second hole into the
space between the inner wall portion and the outer wall portion can
be guided again from the first hole into the space inside the inner
wall portion. In other words, the flow of the gas having passed the
first hole can collide against the gas to be diffused outside from
the muzzle without passing through the first hole, thereby
weakening the power or force of the gas diffused without passing
through or entering the first hole.
[0046] Moreover, by virtue of the protruding portion located at the
first hole adjacent the second hole on a peripheral surface of the
inner wall portion and protruding from the inner wall portion
toward the outer wall portion, the volume of the space between the
inner wall portion and the outer wall portion in the vicinity of
the first hole can be decreased. In other words, as the flow rate
of the gas in the vicinity of the first hole becomes greater than
that of the gas in the vicinity of the second hole, it can
vigorously collide against the gas diffused without entering or
passing through the first hole.
[0047] In order to attain the above objective, in still another
aspect of the invention, a firearm is provided with a gun barrel
having a gun barrel hole formed in an area thereof adjacent to a
muzzle, and a muzzle brake, which comprises: a substantially
tubular inner wall portion having a first hole formed in an area
thereof corresponding to the gun barrel hole, and to which the gun
barrel can be fixed inside the inner wall portion; an outer wall
portion substantially surrounding the inner wall portion and having
a second hole formed closer to a location into which the gun barrel
is inserted than the location where the first hole is formed; a
first blocking portion arranged closer to the location into which
the gun barrel is inserted than the location where the first hole
is formed, and configured to block a clearance between the inner
wall portion and the outer wall portion; a second blocking portion
arranged more opposite to the first blocking portion than the
location where the first hole is formed, and configured to block a
clearance between the inner wall portion and the outer wall
portion; a guiding outer wall portion substantially surrounding the
outer wall portion; a third blocking portion located more closer to
the location into which the gun barrel is inserted than a location
where the second hole is formed, and configured to block a
clearance between the outer wall portion and the guiding outer wall
portion; a fourth blocking portion located more opposite to the
third blocking portion than a location where the second hole is
formed, and configured to block a clearance between the outer wall
portion and the guiding outer wall portion; a third hole formed in
the fourth blocking portion; and a partition portion having a
fourth hole formed in at least a part thereof, and configured to
block a clearance between the outer wall portion and the guiding
outer wall portion.
[0048] Moreover, by virtue of the gun barrel having the gun barrel
hole formed in an area thereof adjacent to the muzzle, the gas
generated at the time of firing can be diffused outside from the
gun barrel hole.
[0049] Moreover, by virtue of the inner wall portion to which the
gun barrel can be fixed thereinto, the muzzle brake can be mounted
to the gun barrel.
[0050] Moreover, by virtue of the inner wall portion having the
first hole formed in an area thereof corresponding to the gun
barrel hole, the gas diffused through the gun barrel hole can be
guided through the first hole.
[0051] Moreover, by virtue of the outer wall portion substantially
surrounding the inner wall portion and having the second hole
formed closer to a location into which the gun barrel is inserted
than the location where the first hole is formed, the space between
the inner wall portion and the outer wall portion can be formed,
and the gas having passed through the first hole can be guided to
the second hole. In other words, while the gas is guided into the
space, it is cooled to gradually reduce the pressure thereof.
[0052] Moreover, the guiding outer wall portion substantially
surrounding the outer wall portion can surround the gun barrel, the
inner wall portion, and the outer wall portion so as to form the
space between the outer wall portion and the guiding outer wall
portion. In other words, the gas created at the time of firing is
guided to and temporality held in the space.
[0053] Moreover, by virtue of the fourth blocking portion located
more opposite to the third blocking portion than a location where
the second hole is formed, and configured to block a clearance
between the outer wall portion and the guiding outer wall portion,
and the third hole formed in the fourth blocking portion, the gas
can be discharged outside from the third hole while being guided
into the space formed between the outer wall portion and the
guiding outer wall portion. In other words; the gas can be
ultimately diffused outside while reducing the pressure of the
gas.
[0054] Moreover, by virtue of the partition portion having the
fourth hole formed in at least a part thereof, and configured to
block the clearance between the outer wall portion and the guiding
outer wall portion, the gas can be guided through the fourth hole
to the space in which the partition portion is arranged.
Advantageous Effects of Invention
[0055] A muzzle brake in accordance with some embodiments of the
invention can reduce efficiently the influence of the gas at the
time of firing. Moreover, the firearm in accordance with some
embodiments of the invention can reduce efficiently the influence
caused by the gas at the time of firing.
BRIEF DESCRIPTION OF DRAWINGS
[0056] FIG. 1 is a schematic perspective view showing an exemplary
first embodiment of the present invention.
[0057] FIG. 2 is a schematic sectional view showing an example of a
second embodiment of the present invention.
[0058] FIG. 3(a) is a schematic view showing a configuration of a
partition plate (1) and FIG. 3(b) is a schematic view showing a
configuration of a partition plate (2).
[0059] FIG. 4 is a schematic sectional view showing an example of a
third embodiment of the present invention.
[0060] FIG. 5 is a schematic sectional view showing an example of a
fourth embodiment of the present invention.
[0061] FIG. 6 is a schematic view showing a conventional muzzle
brake.
DESCRIPTION OF EMBODIMENTS
[0062] Hereinafter, referring to the drawings an embodiment of a
muzzle brake in accordance with the present invention is described
in order to develop an understanding of the present invention.
[0063] FIG. 1 is a schematic perspective view showing an example of
the first embodiment of the present invention.
[0064] Referring to FIG. 1, a muzzle brake 1 which is an exemplary
muzzle brake to which the present invention is applied is provided
with an inner tubular portion 2, an outer tubular portion 3, and a
lid portion 4.
[0065] Moreover, the tip portion of the gun barrel 5 is fixed to
the inside of the inner tubular portion 2. A space is formed inside
the inner tubular portion 2 on an extension of a muzzle 6.
Moreover, a plurality of first gas-guiding holes 7 is formed
adjacent to the muzzle 6. The gas at the time of firing passes
through the first gas-guiding hole 7 from the muzzle 6, and is
guided to the space between the inner tubular portion 3 and the
outer tubular portion 4.
[0066] The outer tubular portion 3 surrounds the inner tubular
portion 2. A space is formed between the outer tubular portion 3
and the inner tubular portion 2. Moreover, an opening is formed in
the inner tubular portion 2 and the outer tubular portion 3
adjacent to the gun barrel 5, and a blocking portion 4 is formed
near the location where a bullet is fired. Moreover, the opening
adjacent the gun barrel 5 is closed by the lid portion 4 to form an
openable and closable configuration. Moreover, the lid portion 4
has a configuration (not shown) which can be fixed to the gun
barrel 5 by a screw.
[0067] Moreover, a substantially cylindrical piston 8 is arranged
more closer to the gun barrel 5 than the first gas-guiding holes 7
such that it can be moved in a longitudinal direction of the inner
tubular portion 2. The piston 8 comes in contact with the inner
tubular portion 2 and the outer tubular portion 3, and takes a
pressure of the gas to move (i.e. moves due to the pressure).
[0068] Moreover, the piston 8 is rotatably about the inner tubular
portion 2 which comes in contact with an inner periphery of the
piston 8. Moreover, a weight is partly in an area of the piston 8
such that the center of gravity is biased.
[0069] A spring 9 is arranged adjacent to the piston 8. The spring
9 supports the piston 8 such that the piston 8 which is pushed by
the pressure of the gas moves toward the gun barrel 5. Moreover,
the piston 8 and the spring 9 are not fixed, and each of them is
movable between the first gas-guiding hole 7 and the lid portions
4. Moreover, a spring receptacle with a bearing (not shown) is
arranged in both ends of the spring 9.
[0070] A substantially cylindrical stopper 10 is formed at the
first gas-guiding hole 7 side adjacent to the gun barrel 5 in the
inner tubular portion 2. The stopper 10 prevents the piston 8 from
moving toward the first gas-guiding hole 7.
[0071] The number and the shape of the first gas-guiding hole 7 are
determined such that the gas at the time of firing can be guided to
the space between the inner tubular portion 2 and the outer tubular
portion 3, and are not particularly limited. A configuration where
the plurality of holes is formed on the circumference of the inner
tubular portion 2, a configuration where a slit-like opening is
formed, and etc. may be employed.
[0072] Moreover, the lid portion 4 is not necessarily fixable to
the gun barrel 5 by means of a screw. However, in view of the point
that the muzzle brake 1 can be firmly fixed to the gun barrel 5, it
is desirable that the lid portion 4 is fixable to the gun barrel 5
by means of the screw.
[0073] If the piston 8 can receive or take the pressure of the gas,
the size and weight thereof are not limited. The size and weight of
the piston 8 can be properly determined depending on the kinds of
gun and bullet to which the piston 8 is mounted.
[0074] Moreover, the piston 8 is not necessarily formed such that
it is rotatable and the center of gravity is biased. However, since
raising the gun barrel 5 can be mitigated even in a case where the
gun barrel 5 is shot in an inclined position, the piston 8 is
preferably formed such that it is rotatable and the center of the
gravity is biased.
[0075] The weight is not necessarily mounted in a part of piston 8.
The configuration where the center of gravity is biased may be a
configuration where a part of piston is made hollow.
[0076] Moreover, the spring 9 would be enough that it can support
the piston 8 that is pushed by the pressure of the gas, and the
shape and elasticity thereof are not particularly limited. The
shape and elasticity can be properly determined depending on the
kinds of gun and bullet used.
[0077] In addition, the movement distance between the piston 8 and
the spring 9 can be adjusted by changing the weight of the piston 8
and the elasticity of the spring 9. If the volume of the space
formed by the inner tubular portion 2 and the outer tubular portion
3 can be modified by changing the movement distance. For example,
by lengthening the movement distance of the piston 8 and the spring
9 even when there is much quantity of the gas at the time of
firing, the volume of the space can be sufficiently secured and the
repercussion of the gas can be sufficiently reduced. As a result,
the muzzle brake 1 is be adaptable to a variety of guns and
bullets.
[0078] The piston 8 and the spring 9 are not necessarily
non-fixating configuration. It would be enough that the piston 9
and the spring 9 can receive or take the pressure of the gas. For
example, there may be considered a configuration where an end of
the spring 9 is connected to the piston 8, and an opposite end of
spring 9 away from the piston 8 is fixed to the inner tubular
portion 2.
[0079] Moreover, the stopper 10 is not necessarily formed in the
inner tubular portion 2. However, in view of the point that the
movement of the piston 8 toward the first gas-guiding hole 7 is
suppressed and the pressure of the gas coming from the first
gas-guiding hole 7 is easily received or taken, it is desirable
that the stopper 10 is formed in the inner tubular portion 2.
[0080] Moreover, the spring receptacle with the bearing is not
necessarily arranged at the both ends of the spring 9. However, in
view of the point that the movement of the piston 8 is sufficiently
supported and the durability of the device is improved, it is
desirable that the spring receptacle with the bearing is arranged
at the both ends of the spring 9.
[0081] Moreover, it would be enough that the stopper 10 can
suppress the migration of the piston 8 toward the first gas-guiding
hole 7. The shape of the stopper 10 is not particularly limited.
For example, the stopper 10 may be partly formed on the
circumference of the inner tubular portion 2.
[0082] The application of the first embodiment of the present
invention is described in order to develop an understanding of the
present invention.
[0083] The motion of the gas and the reduction of the repercussion
at the time of firing are as follows.
[0084] Firstly, at the time of firing, a bullet is fired from the
muzzle 6 and a part of fired gas is diffused outside from the
opening of the inner tubular portion 2 on the extension of the
muzzle 6. The pressure created by the gas diffused outside serves
as the repercussion which pushes the muzzle brake 1 and the gun
barrel 5 posterior to a shooter.
[0085] Moreover, the gas having not been diffused outside passes
through the first gas-guiding hole 7, and flows into the space
between the inner tubular portion 2 and the outer tubular portion
3. This gas is held in the space for a definite period of time.
After that, the gas is cooled and the volume of the gas contracts
with the elapse of time. As a result, the pressure falls gradually.
Due to the fall in the pressure, repercussion of gas becomes
weaker.
[0086] Moreover, a part of the gas having passed through the first
gas-guiding hole 7 is taken by the blocking portion 11, and exerts
a pressure in a firing direction. The pressure serves as a force
which pushes out the muzzle brake 1 and the gun barrel 5 in the
firing direction.
[0087] That is, the pressure of the gas having passed through the
first gas-guiding hole 7 can act counter to the pressure of the gas
diffused outside on the border of the blocking portion 11, thereby
reducing the repercussion caused by the gas diffused outside.
[0088] Moreover, among the gas having passed the first gas-guiding
hole 7 the surplus gas which cannot be settled or received in the
space at the blocking portion 11 side flows toward the piston 8.
The piston 8 is pushed by the pressure of the surplus gas to move
back. Moreover, the piston 8 is supported by the spring 9.
[0089] The piston 8 moves in a direction substantially parallel to
the gun barrel 5 to reduce a blur of the gun barrel caused by the
repercussion of the gas, and maintain the position of the gun
barrel. Moreover, due to the contraction of the spring 9, the
volume of the space can become larger, and the surplus gas can be
also held in the space.
[0090] Moreover, the gas diffused outside and the gas remaining
inside the gun barrel produce the repercussion in a lengthwise
direction (i.e., the lengthwise repercussion) such that the muzzle
brake 1 and the gun barrel 5 raises upward. However, since the
piston 8 is rotatable and the center of gravity is biased, the
center of gravity of the piston 8 is always located perpendicularly
and downwardly, thereby suppressing effectively the lengthwise
repercussion caused by the gas.
[0091] As such, the pressure of the gas guided to the inside of the
muzzle brake 1 is used for pushing out the gun barrel 5 anteriorly
as well as the movement of the piston 8. Moreover, the gas is held
in the space for a definite period of time and is then cooled and
the pressure falls gradually. Eventually the gas is diffused
outside slowly from the opening of the inner tubular portion 2 on
the extension of the muzzle 6.
[0092] As described previously, in the first embodiment of the
present invention, the pressure of the gas guided to the inside of
the muzzle brake 1 is used to offset the repercussion caused by the
pressure of the gas diffused outside, thereby reducing the
repercussion exerted on the gun barrel 5.
[0093] Moreover, the gas is held inside the muzzle brake 1 for a
definite period of time, and the pressure of the gas is reduced
with the elapse of time.
[0094] Moreover, due to the movement of the piston 8, the
repercussion caused by the pressure of the gas and working
posteriorly can be reduced. Furthermore, due to the configuration
where the piston is rotatable and the center of gravity is biased,
the lengthwise repercussion can be reduced. Furthermore, as the
piston 8 moves, the position of the gun barrel 5 can be
stabilized.
[0095] Moreover, since the fired gas is not spread or diffused from
any site or area other than the opening of the inner tubular
portion 2, the reflection of the gas hardly occurs in the
topography of the surroundings such as a wall and a ground, and the
blur of the gun barrel 5 becomes less. Moreover, the firing sound
can be significantly reduced.
[0096] Moreover, since like the fired gas, the firing flame is not
spread or diffused from any site or area other than the opening of
the inner tubular portion 2, it shall be hard to do a damage caused
by the firing flame to the surrounding human being.
[0097] Moreover, since the lid portion 4 is the openable and
closable configuration, the piston 8 and the spring 9 can be easily
exchanged, thereby improving the maintenance performance.
[0098] Moreover, since the piston is a tough configuration of being
able to bear the repetitive movements, the consumption thereof
caused by fired gas is not significant, thereby enhancing the
durability of the device.
[0099] Next, a second embodiment of the invention is described.
FIG. 2 is a schematic sectional view showing an example of the
second embodiment of the present invention. FIG. 3(a) is a
schematic view showing a configuration of a partition plate (1) and
FIG. 3(b) is a schematic view showing a configuration of a
partition plate (2).
[0100] Referring to FIG. 2, a large-caliber muzzle brake 12, an
exemplary muzzle brake in accordance with the present invention has
an inner tubular portion 13, an outer tubular portion 14, a guiding
outer tubular portion 15, and a lid portion 16.
[0101] Moreover, a large-caliber gun barrel 17 is fixed to the
inside of the inner tubular portion 13. In addition, since the
second embodiment has the fundamental configurations of the inner
tubular portion 13 and the outer tubular portion 14, the first
gas-guiding hole 7 and the piston 8, the spring 9, the stopper 10,
and the blocking portion 11 in common with the first embodiment,
the detailed description in this regard is omitted.
[0102] As shown in FIG. 2, a second gas-guiding hole 18 is formed
on a part of the outer periphery of the outer tubular portion 14.
The second gas-guiding hole 18 is formed in the middle of the
movement region of the piston 8 and in the vicinity of the location
where the piston 8 is sufficiently pushed or pressed. The second
gas-guiding hole 18 passes through a space between the inner
tubular portion 13 and the outer tubular portion 14, and is
configured to pass the gas having pushed the piston 8
therethrough.
[0103] Furthermore, the guiding outer tubular portion 15 surrounds
the outer tubular portion 14 to provide a space between the guiding
outer tubular portion 15 and the outer tubular portion 14.
Furthermore, an opening is formed in both of the outer tubular
portion 14 and the guiding outer tubular portion 15 adjacent to the
gun barrel 5, and a blocking portion 19 is formed adjacent the
location where the bullet is fired. Moreover, a third gas-guiding
hole 20 is formed in the blocking portion 19 to diffuse the gas
outside.
[0104] Moreover, the opening at the gun barrel 17 side is closed by
the lid portion 16 to form an openable and closable configuration.
Moreover, the lid portion 16 has a configuration which can be fixed
to the gun barrel 17 by a screw.
[0105] Moreover, a plurality of partition plates 22 is arranged in
the large-caliber muzzle brake 12 to partition the space formed
between the outer tubular portion 14 and the guiding outer tubular
portion 15. A fourth gas-guiding hole 23 is formed in the partition
plate 22 to pass the gas therethrough.
[0106] Moreover, referring to FIG. 3, the location of the fourth
gas-guiding hole 23 in the partition plate 22 is formed in two
patterns. Both of FIG. 3(a) and FIG. 3(b) are viewed from the plane
which substantially intersects with the lengthwise direction of the
guiding outer tubular portion 15.
[0107] Referring to FIG. 3(a), a plurality of the fourth
gas-guiding holes 23 is formed in the vicinity of the outer
periphery of the partition plate 22. On the other hand, referring
to FIG. 3(b), a plurality of the fourth gas-guiding holes 23 is
formed in the vicinity of the inner periphery of the partition
plate 22.
[0108] Referring to FIG. 2, these two partition plates 22 are
alternately arranged in the large-caliber muzzle brake 12.
[0109] The number and the shape of the second gas-guiding hole 18
are determined such that the gas can be guided to an area at the
gun barrel 17 side and the space between the outer tubular portion
14 and the guiding outer tubular portion 15, and are not
particularly limited. A configuration where the plurality of holes
is formed on the outer periphery of the outer tubular portion 14, a
configuration where a slit-like opening is formed, and etc. may be
employed.
[0110] Moreover, the second gas-guiding hole 18 is not necessarily
formed in the vicinity of the location where the piston 8 is
sufficiently pushed or pressed. However, in view of the point that
the volume of the space between the inner tubular portion 13 and
the outer tubular portion 14 is sufficiently utilized, it is
desirable that the second gas-guiding hole 18 is formed in the
vicinity of the location where the piston 8 is sufficiently pushed
or pressed.
[0111] Moreover, the lid portion 16 is not necessarily formed as a
configuration 21 which can be fixed to the gun barrel 17 by a
screw. However, in view of the point that the muzzle brake 12 can
be firmly fixed to the gun barrel 17, it is desirable that the lid
portion 16 is formed as the configuration 21 which can be fixed to
the gun barrel 17 by a screw.
[0112] Moreover, the large-caliber muzzle brake 12 is not
necessarily provided with the partition plate 22. However, in view
of the point of increasing a period of time needed to move the
guided gas to enhance cooling effect and reduce sufficiently the
pressure, it is desirable that the partition plate 22 is arranged
in the muzzle brake 12.
[0113] Moreover, the two different partition plates where the
arrangements of the fourth gas-guiding holes 23 are different from
each other are not necessarily arranged in an alternate manner.
However, in view of the point of increasing a period of time needed
to move the guided gas to enhance cooling effect and reduce
sufficiently the pressure, it is desirable that the two partition
plates where the arrangements of the fourth gas-guiding holes 23
are alternately arranged.
[0114] Moreover, the arrangement of the partition plate 22 is not
particularly limited. For example, a configuration where the
partition plates are arranged one by one, and a configuration where
a plurality of partition plates is coupled by a rod-like member and
is thus integrated may be adopted. In the integrated configuration,
the partition plate 22 can be exchanged as a whole, thereby
improving the maintenance performance.
[0115] Moreover, a gun which can be provided with the large-caliber
muzzle brake 12 is not particularly limited. For example, the
large-caliber muzzle brake 12 may be mounted to a gun of
222-caliber and used.
[0116] The application of the second embodiment of the present
invention is described in order to develop an understanding of the
present invention.
[0117] The motion of the gas and the reduction of repercussion at
the time of firing are as follows.
[0118] The greater the caliber of the large-caliber gun barrel 17
is, the greater the amount of the gas needed for the firing of the
bullet is. Accordingly, the repercussion caused by the gas and
exerted on the gun barrel become greater. In the second embodiment,
the description is hereinafter made from the point that due to the
gas the piston 8 is pushed and moved.
[0119] Firstly, the gas having passed through the first gas-guiding
hole 7 and pushed the piston 8 among the gas occurring at the time
of firing passes through the second gas-guiding hole 18 and flows
into the space formed in the guiding outer tubular portion 15. This
gas is held in the space for a definite period of time. After that,
the gas is cooled and the volume of the gas contracts with the
elapse of time. As a result, the pressure falls gradually. Due to
the fall in the pressure, the repercussion of the gas becomes
weaker.
[0120] Moreover, among the gas having passed the second gas-guiding
hole 18 the surplus gas which cannot be settled or received in the
space formed in the guiding outer tubular portion 15 flows toward
the partition plate 22. The gas passes through the fourth
gas-guiding hole 23 of the partition plate 22, and is guided into
the space formed by the plurality of partition plates 22.
[0121] Moreover, the guided gas moves toward the fourth gas-guiding
hole 23 of the partition plates 22. In this regard, the neighboring
partition plates are different from each other in the location
where the fourth gas-guiding hole 23 is formed. During this step, a
period of time needed for the movement of the gas increases,
thereby improving the cooling effect caused by the gas.
[0122] The gas having passed the fourth gas-guiding hole 23 of the
partition plate 22 diffuses outside from the third gas-guiding hole
20 that is formed in the blocking portion 19. Furthermore, the gas
held inside the large-caliber muzzle brake 12 is cooled and the
pressure falls gradually. The gas is diffused outside slowly from
the opening of the inner tubular portion 13 on the extension of a
muzzle 24,
[0123] As described previously, in accordance with the second
embodiment of the present invention, the pressure of the gas guided
to the inside of the large-caliber muzzle brake 12 is used to
offset the repercussion caused by the pressure of the gas diffused
outside, thereby reducing the repercussion exerted on the gun
barrel 17.
[0124] Moreover, due to the movement of the piston 8, the
repercussion caused by the pressure of the gas and working
posteriorly can be reduced. Furthermore, due to the configuration
where the piston is rotatable and the center of gravity is biased
the lengthwise repercussion can be reduced. Furthermore, as the
piston 8 moves, the position of the gun barrel 17 can be
stabilized.
[0125] By adopting the guiding outer tubular portion 15, the amount
of the gas held inside can be increased, thereby being adaptable to
a large-caliber gun.
[0126] Next, a third embodiment of the invention is described.
[0127] FIG. 4 is a schematic sectional view showing an example of a
third embodiment of the present invention.
[0128] Referring to FIG. 4, a simplified muzzle brake 25, an
exemplary muzzle brake in accordance with the present invention has
an inner tubular portion 26 and an outer tubular portion 27.
[0129] Moreover, a gun barrel 28 is fixed to the inside of the
inner tubular portion 26. Furthermore, a first gas-guiding hole 29
is formed adjacent to the location of the inner tubular portion 26
where the bullet is fired. Furthermore, a second gas-guiding hole
31 is formed in the vicinity of a muzzle 30 of the inner tubular
portion 26.
[0130] Moreover, the gross-sectional area of the first gas-guiding
hole 29 on the circumference (i.e., periphery) of the inner tubular
portion 26 is less than the gross-sectional area of the second
gas-guiding hole 31 on the circumference of the inner tubular
portion 26.
[0131] Moreover, a protruding portion 32 is formed at the first
gas-guiding hole 29 adjacent the gun barrel 28 side in the inner
tubular portion 26. Due to the protruding portion 32 the volume of
the space between the inner tubular portion 26 and the outer
tubular portion 27 is reduced. For the above configuration, the
flow rate of the guided gas can be increased, and the pressure of
the gas flowing from the first gas-guiding hole 29 to the inner
tubular portion 26 can be increased.
[0132] Furthermore, the outer tubular portion 27 surrounds the
inner tubular portion 26 to provide a space between the outer
tubular portion 27 and the inner tubular portion 26. Furthermore, a
blocking portion 34 with an inclined surface 33 is formed in the
vicinity of the second gas-guiding hole 31 in the inner tubular
portion 26 and the outer tubular portion 27 at the gun barrel 5
side. Furthermore, a blocking portion 36 with a curved surface 35
is formed in the inner tubular portion 26 and the outer tubular
portion 26 and adjacent to the location where a bullet is
fired.
[0133] Moreover, an area which is located between the inner tubular
portion 26 and the outer tubular portion 27 and adjacent to the gun
barrel 28 from the blocking portion 34 is solid.
[0134] The number and the shape of the first gas-guiding hole 29
are determined such that the gas can be guided from the space
between the inner tubular portion 26 and the outer tubular portion
27 to the space inside the inner tubular portion 26, and are not
particularly limited. A configuration where the plurality of holes
is formed on the peripheral surface of the inner tubular portion 26
and a configuration where a slit-like opening is formed, and etc.
may be employed.
[0135] The number and the shape of the second gas-guiding hole 31
are determined such that the gas can be guided to the space between
the inner tubular portion 26 and the outer tubular portion 27, and
are not particularly limited. A configuration where the plurality
of holes is formed on the peripheral surface of the inner tubular
portion 26 and a configuration where a slit-like opening is formed,
and etc. may be employed.
[0136] Moreover, the gross-sectional area of the first gas-guiding
hole 29 on the circumference of the inner tubular portion 26 is not
necessarily less than the gross-sectional area of the second
gas-guiding hole 31 on the circumference of the inner tubular
portion 26. However, in view of the point that the flow rate (i.e.,
the speed) of the gas passing through the first gas-guiding hole
can be increased, and the repercussion caused by the gas diffused
outside from the muzzle 30 can be further effectively reduced, it
is desirable that the gross-sectional area of the first gas-guiding
hole 29 on the circumference of the inner tubular portion 26 is
less than the gross-sectional area of the second gas-guiding hole
31 on the circumference of the inner tubular portion 26.
[0137] Moreover, the blocking portion 34 does not necessarily have
the inclined surface 33. However, in view of the point that the gas
passing through the second gas-guiding hole 31 can be smoothly
flowed in the firing direction and the force or power of the gas
diffusing from the muzzle 30 to outside can be easily reduced, it
is desirable that the blocking portion 34 has the inclined surface
33.
[0138] Moreover, the blocking portion 36 does not necessarily have
the curved surface 35. However, in view of the point that the
flowing gas can be smoothly flowed to the first gas-guiding hole
29, and the force or power of the gas diffusing from the muzzle 30
to outside can be easily reduced, it is desirable that the blocking
portion 34 has the inclined surface 35.
[0139] The application of the second embodiment of the present
invention is hereinafter described in order to develop an
understanding of the present invention.
[0140] The motion of the gas and the reduction of repercussion at
the time of firing are as follows.
[0141] Firstly, at the time of firing, a bullet is fired from the
muzzle 30 and a part of the fired gas is diffused outside from the
opening of the inner tubular portion 26 on the extension of the
muzzle 30. The pressure created by the gas diffused outside serves
as the repercussion which pushes the muzzle brake 25 and the gun
barrel 28 posterior to a shooter.
[0142] Moreover, a part of the gas having not been diffused outside
passes through the first gas-guiding hole 31, and flows into the
space between the inner tubular portion 26 and the outer tubular
portion 27. The gas flows along the inclined surface 33 of the
blocking portion 34 to move in the firing direction (i.e., toward
the location where the bullet is fired).
[0143] The flow rate of the gas having passed the gas through the
second gas-guiding hole 31 is increased in the location of the
protruding portion 32 to reach the blocking portion 36. The gas is
taken by the blocking portion 36 to work the pressure in the firing
direction. The pressure serves as a force to push out the
simplified muzzle brake 25 and the gun barrel 28 in the firing
direction.
[0144] That is, the pressure of the gas having passed through the
second gas-guiding hole 31 can act counter to the pressure of the
gas diffused outside on the border of the blocking portion 36,
thereby reducing the repercussion caused by the gas diffused
outside.
[0145] Moreover, the gas which reaches the location of the blocking
portion 36 flows along the curved surface 35 to pass through the
first gas-guiding hole 29. The gas having passed the first
gas-guiding hole 29 collides against the gas to be diffused outside
from the muzzle 30 without passing through the first gas-guiding
hole 29, thereby weakening the power or force to reduce the
repercussion.
[0146] The gas to be diffused outside with the weakened power is
diffused outside from the opening of the inner tubular portion 26
on the extension of the muzzle 30.
[0147] As described previously, in accordance with the third
embodiment of the invention the flow of the gas collides against
the gas to be diffused outside to reduce the repercussion caused by
the gas and exerted on the gas barrel.
[0148] Moreover, since the simplified muzzle brake 25 has a
simplified configuration, it is hard to break and is easily
attachable and removable.
[0149] Next, a fourth embodiment of the invention is described.
FIG. 5 is a schematic sectional view showing an example of a fourth
embodiment of the present invention.
[0150] Referring to FIG. 5, a gun 37, an exemplary firearm to which
the invention is applied has a gun barrel 38 and a muzzle brake 39.
A plurality of gun barrel holes 41 is formed in the vicinity of a
muzzle 40 in the gun barrel 38.
[0151] The muzzle brake 39 has an inner tubular portion 42, an
outer tubular portion, and a guiding outer tubular portion 44.
[0152] The gun barrel 38 is inserted into the inner tubular portion
42, and fixed to the gun barrel 38 by a screw fixing member 45.
Furthermore, a plurality of first gas-guiding holes 53 is formed in
a location corresponding to the gun barrel hole 41 of the inner
tubular portion 42.
[0153] Furthermore, the outer tubular portion 43 surrounds the
inner tubular portion 42 to provide a space between the outer
tubular portion 43 and the inner tubular portion 42. Furthermore, a
blocking portion 46 is formed in the inner tubular portion 42 and
the outer tubular portion 43 adjacent the location where the bullet
is fired. Moreover, a second gas-guiding hole 47 is formed on the
outer periphery of the outer tubular portion 43 and adjacent to the
gun barrel 38.
[0154] Moreover, the guiding outer tubular portion 44 surrounds the
outer tubular portion 43 to provide a space between the guiding
outer tubular portion 44 and the outer tubular portion 43.
Furthermore, a blocking portion 48 is formed in the outer tubular
portion 43 and the guiding outer tubular portion 44 adjacent to the
location where the bullet is fired. Moreover, a third gas-guiding
hole 49 is formed in the blocking portion 48 to diffuse the gas
outside. Furthermore, a blocking portion 50 is formed in the outer
tubular portion 43 and the guiding outer tubular portion 44 at the
gun barrel side.
[0155] A plurality of partition plates 51 is arranged in the muzzle
brake 38 to partition the space between the outer tubular portion
43 and the guiding outer tubular portion 44. A fourth gas-guiding
hole 52 configured to pass the gas therethrough is formed in the
partition plate 51.
[0156] The application of the fourth embodiment of the present
invention is hereinafter described in order to develop an
understanding of the present invention.
[0157] The motion of the gas and the reduction of repercussion at
the time of firing are as follows.
[0158] Firstly, at the time of firing, a bullet is fired from the
muzzle 40 and a part of the fired gas is diffused outside from the
muzzle 40. The pressure created by the gas diffused outside serves
as the repercussion which pushes the muzzle brake 39 and the gun
barrel 38 posterior to a shooter.
[0159] Moreover, the gas having not been diffused outside passes
through the first gas-guiding hole 53, and flows into the space
between the inner tubular portion 42 and the outer tubular portion
44. Furthermore, a part of the gas having passed the first
gas-guiding hole 53 is taken or received by the blocking portion
46, and exerts a pressure in the firing direction. The pressure
serves as a force to push out the muzzle brake 39 and the gun
barrel 38 in the firing direction.
[0160] Moreover, the gas having passed the first gas-guiding hole
53 flows to the second gas-guiding hole 47, passes through the
second gas-guiding hole 47, flows into the space between the outer
tubular portion 43 and the guiding outer tubular portion 44, and
flows to the partition plate 51. The gas passes through the fourth
gas-guiding hole 52 of the partition plate 51, and is guided to the
space formed by the plurality of partition plates 51.
[0161] The gas having passed through the fourth gas-guiding hole 52
of the partition pate 51 is diffused outside from the third
gas-guiding hole 49 that is formed in the blocking portion 48.
Furthermore, the gas held inside the muzzle brake 39 is cooled and
the pressure falls gradually. The gas is diffused outside slowly
from the muzzle 40.
[0162] As described previously, in accordance with the third
embodiment of the present invention, the pressure of the gas guided
to the inside of the muzzle brake 39 is used to offset the
repercussion caused by the pressure of the gas diffused outside,
thereby reducing the repercussion exerted on the gun barrel 38.
[0163] By virtue of the gun barrel hole 41 and the first
gas-guiding hole 53 corresponding to the gun barrel hole 41, the
gas produced at the time of firing can be directly incorporated or
introduced into the muzzle brake 39. Due to this, the effect of
reducing the repercussion of the gas can be improved.
[0164] By virtue of the guiding outer tubular portion 44, the
amount of the gas held inside can be increased, thereby being
adapted to a large-caliber gun. In addition, by virtue of the
partition plate 51, the cooling effect of the gas can be improved,
and the repercussion can be reduced.
[0165] As mentioned above, the muzzle brake in accordance with the
embodiments of the invention can efficiently reduce the influence
of the gas at the time of firing. Moreover, the firearm to which
any of the embodiments of the invention is applied can efficiently
reduce the influence of the gas at the time of firing.
REFERENCE SIGNS LIST
[0166] 1 muzzle brake [0167] 2 inner tubular portion [0168] 3 outer
tubular portion [0169] 4 lid portion [0170] 5 gun barrel [0171] 6
muzzle [0172] 7 first gas-guiding hole [0173] 8 piston [0174] 9
spring [0175] 10 stopper [0176] 11 blocking portion [0177] 12
large-caliber muzzle brake [0178] 13 inner tubular portion [0179]
14 outer tubular portion [0180] 15 guiding outer tubular portion
[0181] 16 lid portion [0182] 17 gun barrel [0183] 18 second
gas-guiding hole [0184] 19 blocking portion [0185] 20 third
gas-guiding hole [0186] 21 fixed configuration [0187] 22 partition
plate [0188] 23 fourth gas-guiding hole [0189] 24 muzzle [0190] 25
simplified muzzle brake [0191] 26 inner tubular portion [0192] 27
outer tubular portion [0193] 28 gun barrel [0194] 29 first
gas-guiding hole [0195] 30 muzzle [0196] 31 second gas-guiding hole
[0197] 32 protruding portion [0198] 33 inclined surface [0199] 34
blocking portion [0200] 35 curved surface [0201] 36 blocking
portion [0202] 37 gun [0203] 38 gun barrel [0204] 39 muzzle brake
[0205] 40 muzzle [0206] 41 gun barrel hole [0207] 42 inner tubular
portion [0208] 43 outer tubular portion [0209] 44 guiding outer
tubular portion [0210] 45 screw fixing member [0211] 46 blocking
portion [0212] 47 second gas-guiding hole [0213] 48 blocking
portion [0214] 49 third gas-guiding hole [0215] 50 blocking portion
[0216] 51 partition plate [0217] 52 fourth gas-guiding hole [0218]
53 first gas-guiding hole
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