Vortices-activated muzzle stabilizer for a gun

A vortices-activated muzzle stabilizer (2) for a gun, which muzzle stabiliser (2) comprises a cylindrical body (4) having a main vent slot (6) which defines a main gas deflection area and which deflects the gases in the form of gas vortices, a balancing slot (12) which extends at 90 degrees to the longitudinal axis of the body (4) and which is positioned opposite the main vent (6), a barrel connecting bore (14) for affording a connecting passage between the muzzle stabilizer (2) and the barrel of the and a gas exhaust aperture (20) which is positioned at a downstream end (22) of the body (4).

This invention relates to a vortices-activated muzzle stabiliser for a gun. 
Muzzle compensators for guns are well known. The muzzle compensators are 
used on many different types of guns and they tend to act to reduce recoil 
but they give little control on barrel movement. The known muzzle 
compensators deflect the gases, usually sideways, such that they only 
control muzzle movement in one direction. 
It is an aim of the present invention to obviate or reduce the above 
mentioned problem. 
Accordingly, this invention provides a vortices-activated muzzle stabilser 
for a gun, which muzzle stabiliser comprises a cylindrical body having: 
(i) a single main vent slot which defines a main gas deflection area by 
extending inwardly at an angle of less than 40 degrees to the longitudinal 
axis of the body from a peripheral portion of the body to a central 
portion of the body, and which deflects the gases in the form of gas 
vortices; 
(ii) a balancing slot which extends at 90 degrees to the longitudinal axis 
of the body and which is positioned opposite the main vent slot; 
(iii) a barrel connecting bore for affording a connecting passage between 
the muzzle stabiliser and the barrel of the gun; and 
(iv) a gas exhaust aperture which is positioned at a downstream end of the 
body. 
Unlike known muzzle compensators, the muzzle stabiliser of the present 
invention operates on gas vortices generated during the firing of the gun. 
The muzzle stabiliser enables the gas vortices to be deflected and 
directed as required to balance the muzzle. The muzzle stabiliser not only 
reduces recoil but is able to control the movement of the barrel of the 
gun in three directions. The muzzle stabiliser may be used on all types of 
guns. Thus, for example, the muzzle stabiliser may be used on rifles, hand 
guns and cannons, and the guns may be used for military or civilian 
purposes as required. 
The main vent slot may extend inwardly at an angle of 15-35 degrees to the 
longitudinal axis of the body. Preferably, the main vent slot extends 
inwardly at an angle of 25 degrees to the longitudinal axis of the body. 
The main vent slot may deflect the gas in the form of two vortices which 
extend away from each other at an angle of 45 degrees and which define 
between them a substantially solid wall of gas during firing of the gun. 
The muzzle stabilser may include an insert positioned in the barrel 
connecting bore, the insert having a sloping end which extends inwardly at 
an angle of less than 90 degrees to the longitudinal axis of the body, the 
sloping end having a slot positioned adjacent the balancing slot so that 
the sloping end does not block the balancing slot, and the insert being 
such that it causes a low gas pressure between the insert and an inside 
wall of the body during use of the vortices-activated muzzle stabiliser. 
The muzzle stabiliser may be such that it is able to be rotatably adjusted 
for right or left handed persons. 
The balancing slot will usually be constructed to be proportional to the 
size of the barrel connecting bore and the size of the gas exhaust 
aperture. 
If desired, the body may be provided with a gas brake device. The gas brake 
device may comprise a gas diverting aperture which extends completely 
through the gas brake device and at 90 degrees to the longitudinal axis of 
the body. 
The body may be made in one piece. Alternatively, if desired, the body may 
be made in two or more parts. 
The muzzle stabiliser may include a flash hider which operates to suppress 
flash consequent upon firing of the gun. Since the flash hider operates to 
break up the exhaust gases, care should be taken to ensure that the flash 
hider does not adversely affect the compensation. The flash hider may be 
any known and suitable type of flash hider. 
The muzzle stabiliser may be one in which the body is made in two 
relatively rotatable parts which are rotateable from a first position in 
which the muzzle stabiliser operates in a muzzle stabilising mode to 
second position in which the muzzle stabiliser operates in a flash 
suppressing mode.

Referring to FIGS. 1 and 2, there is shown a muzzle stabiliser 2 for a gun. 
The muzzle stabiliser 2 comprises a cylindrical body 4. 
The body 4 comprises a main vent slot 6 which defines a main gas deflection 
area. The main vent slot 6 extends inwardly at an angle to the 
longitudinal axis of the body 4 from a peripheral portion 8 of the body 4 
to a central portion 10 of the body 4. As can be seen most clearly from 
FIG. 2, the central portion 10 is positioned inwardly for approximately 
half the diameter of the body 4. The main vent slot 6 is effective to 
deflect the gases in the form of gas vortices. More specifically, as the 
gun is fired, the generated gases pass along a bore 18 of the barrel 16 of 
the gun. The gas can then pass into the muzzle stabiliser 2 from where 
they are deflected as vortices through the main vent slot 6. 
The muzzle stabiliser 2 also comprises a balancing slot 12 which is shown 
in FIG. 1. The balancing slot 12 extends at 90 degrees to the longitudinal 
axis of the body 4. As can be seen from FIG. 1, the balancing slot 12 is 
positioned opposite the main vent slot 6. Gases from the gun are also able 
to pass through the balancing slot 12. The gases passing through the 
balancing slot 12 act to prevent over compensation due to the action of 
the main vent slot 6. 
The muzzle stabiliser 2 further comprises a barrel connecting bore 14 for 
affording a connecting passage between the muzzle stabiliser 2 and the 
barrel 16 of the gun. During firing of the gun, the gases pass along the 
bore 18 of the gun and then into the barrel connecting bore 14 of the 
muzzle stabiliser 2. 
The muzzle stabiliser 2 still further comprises a gas exhaust aperture 20. 
The gas exhaust aperture 20 is positioned at a downstream end 22 of the 
body 4. The gases in the muzzle stabiliser 2 not dispersed through the 
main vent slot 6 and the balancing slot 12 pass through the gas exhaust 
aperture 20 and out through the muzzle stabiliser 2. Obviously, the fired 
bullet or bullets also pass out of the muzzle stabilisers 2 through the 
gas exhaust aperture 20. 
As can be seen from FIG. 2, the main vent slot 6 extends at an angle of 
inclination of 25 degrees to the longitudinal axis of the body 4. This 
angle of inclination may be varied by plus or minus 10 degrees. On firing 
of the gun, the main vent slot 6 deflects the gases in the form of two 
vortices which extend away from each other at an angle of 45 degrees and 
which define between them a substantially solid wall of gas. 
The body 4 includes an insert 24. The insert 24 is positioned in the barrel 
connecting bore 14, upstream of the gas exhaust aperture 20. The insert 24 
is of such a shape relative to the body 4 that the insert 24 causes the 
formation of low pressure gas between the insert 24 and an inside wall 26 
of the body 4. The insert 24 has a sloping end 28 and the gases tend to 
rotate off this sloping end 28. The sloping end 28 has a slot 29 which 
avoids the sloping end 28 blocking the balancing slot 12. 
The end of the insert 24 remote from the sloping end 28 is threaded so that 
it is able to screw into the body 4 of the muzzle stabilser 2. 
The muzzle stabiliser 2 shown in FIGS. 1 and 2 is rotateably adjustable for 
right or left handed persons. This may be effected by an adjustment device 
30. The adjustment device 30 may act to lock the muzzle stabiliser 2 in 
its chosen position. 
The muzzle stabiliser 2 is provided with a gas brake device 32. The gas 
brake device 32 can be screwed or otherwise, secured to the body 4. The 
gas brake device 32 has a central gas exhaust aperture, 34 through which 
the fired bullets and non-deflected gases pass. The gas brake device 32 
has a gas diverting aperture 36 which extends completely through the gas 
brake device 34 at 90 degrees to the longitudinal axis of the body 4. The 
body 4 is preferably made in one piece. If desired, the body 4 may be made 
in two parts which screw together To form a join 40. The insert 24 will 
usually be separately made. The gas brake device 32 may be separately made 
or it may be formed as an integral part of the body 4. 
Referring now to FIGS. 3 and 4, similar parts as in FIGS. 1 and 2 have been 
given similar reference numerals for each of comparison and understanding. 
In FIGS. 3 and 4, it will be seen that the gas brake device 32 has been 
omitted. Also, in FIGS. 3 and 4, the end 38' of the muzzle stabiliser 2' 
is different from the end shown in FIGS. 1 and 2. As shown in FIGS. 1 and 
2, the end 38 of the muzzle stabiliser 2 is that end which connects to the 
barrel 16 of the gun. Generally, the end 38 of the .muzzle stabiliser 2 
can be screwed to the end of the barrel 16, pushed over the end of the 
barrel 16, or otherwise connected as may be suitable and appropriate to 
the end of the barrel 16. 
As can also be seen from FIGS. 3 and 4, the outside shape of the body 4' is 
different to that shown in FIGS. 1 and 2. 
Referring now to FIGS. 5, 6 and 7, there are shown different views of a 
first part 4A of the body 4' of the muzzle stabiliser 2' shown in FIGS. 3 
and 4. Various size dimensions and angles are shown in FIGS. 5, 6 and 7, 
the size dimensions being in millimeters. 
FIG. 8 is a longitudinal view, partially in section, of a second part 4B of 
the muzzle stabiliser 2' shown in FIGS. 3 and 4. FIG. 9 is an end view of 
the muzzle stabiliser 2' shown in FIG. 8. In FIGS. 8 and 9, various sized 
dimensions and angles have again been shown, the size dimensions being in 
millimeters. The second part 4B has a screw threaded recess 42 for 
receiving a screw threaded portion 44 of the part 4A, thereby enabling the 
parts 4A and 4B to be screwed together. 
Referring now to FIGS. 10, 11 and 12 there is shown a third muzzle 
stabiliser. Similar parts as in previous Figures have been given the same 
reference numerals for ease of comparison and understanding. The first and 
second parts 4A, 4B of the body 4'' screw together as shown and they are 
made to be rotateable through 180 degrees. Thus, from a comparison of 
FIGS. 1 and 3 on the one hand and FIG. 10 on the other hand, it will be 
seen that the insert 24'' has been rotated through 180 degrees as compared 
with the position of the insert 24 shown in FIGS. 1 and the insert 24' 
shown in FIG. 3. In the position of the insert 24'' shown in FIG. 10, the 
muzzle stabiliser 2 acts in a different mode of operation to provide flash 
suppression. Thus the muzzle stabiliser 2'' in the position shown in FIG. 
10 acts as a flash hider or a flash suppressor. 
Rotation of the muzzle stabiliser 2'' from its flash suppressor mode of 
operation as shown in FIG. 10 to its muzzle stabilizing mode of operation 
in which the position of the insert 24'' is rotated through 180 degrees 
and is then the same as shown in FIGS. 1 and 3, is effected by relative 
rotation of the parts 4A and 4B using the screw threaded portion 44 and 
the screw threaded recess 42. As can be seen from FIG. 12, a locking pin 
46 is provided. This locking pin 46 goes in one of a pair of opposed 
apertures (not shown) in the end face 48 of the part 4A. When the pin 46 
is in its aperture 46, relative rotation of the parts 4A and 4B is 
prevented. 
The part 4A is provided with a pair of aligning grooves 50, the aligning 
grooves 50 being on opposite sides of the part 4A and only one aligning 
groove being shown. Similarly, the part 4B is provided with a pair of 
aligning grooves 52. When the aligning grooves 50, 52 line up as shown in 
FIG. 10, then the parts 4A, 4B have been relatively rotated to the 
required extent to enable the locking pin 46 to locate in an appropriate 
one of the apertures in the end face 48. 
As can be seen from FIG. 10, the gas brake 32 is formed as an integral part 
of the part 4B. Thus, when a gas braking effect is required of the muzzle 
stabiliser 2, then the part 4B can be produced with the integral gas brake 
device 32'. If a gas braking effect is not required, then the part 4B can 
be produced without the gas brake device 32'. Generally, the gas brake 
device 32' would be used on higher calibre guns. 
As shown in FIG. 11, the slot 29'' is a closed slot, rather than being an 
open slot as shown in FIG. 1. 
Referring to FIGS. 10 and 12, the part 4B of the body 4'' is provided with 
a series of apertures 54. The apertures 54 are shown as slots and there 
are in fact six of the apertures employed in the muzzle stabiliser 2 shown 
in FIGS. 10 to 12. The size, length and number of the apertures 54 may be 
varied for different lengths of barrels of different guns. 
Referring now to FIG. 13, there is shown a muzzle stabiliser 2''' which is 
provided with a booster device 56. The booster device 56 is generally 
conically shaped as shown. The booster device 56 can be secured to the 
body 4''' in any suitable and appropriate manner. The booster device 56 
allows propellant gas to expand in zone 58 before being compressed in zone 
60 to increase recoil. The size, shape and general construction of zone 60 
can be varied for different lengths of barrels of different guns. The 
booster device 56 operates such that it first reduces recoil, then 
stabilises, then acts in a boost mode to increase recoil to operate 
self-loading mechanisms on guns fitted with the muzzle stabiliser 2'''. 
Thus muzzle stabilisers 2''' provided with the booster device 56 will 
usually only be fitted on guns where the barrel is propelled rearwardly in 
order to operate a self-loading mechanism. 
It is to be appreciated that the embodiments of the invention described 
above with reference to the accompanying drawings have been given by way 
of example only and that modifications may be effected. Thus, for example, 
the muzzle stabilisers shown in FIGS. 1 to 9 may be provided with a flash 
hider if desired.