U.S. patent number 3,858,481 [Application Number 05/342,509] was granted by the patent office on 1975-01-07 for for: compensator system for sporting and target rifles.
Invention is credited to Otho Harkness Elliott.
United States Patent |
3,858,481 |
Elliott |
January 7, 1975 |
FOR: COMPENSATOR SYSTEM FOR SPORTING AND TARGET RIFLES
Abstract
In a compensator system for sporting and target rifles for
eliminating gas blow-by, elminating muzzle jump and reducing
recoil, method comprising providing gas chamber means external to
the barrel of the firearm, gas sealing the chamber in respect to
the outside diameter of the barrel except for inlet and outlet port
means for the chamber and during firing of the firearm venting
gases escaping from the interior of the barrel into the chamber to
produce an axially operative forward force which opposes and
reduces the force of recoil of the firearm, the venting of the
gases being accomplished prior to the bullet reaching the muzzle of
the barrel and while the bullet is still sealing the bore of the
barrel, thereby eliminating gas blow-by.
Inventors: |
Elliott; Otho Harkness (Royal
Oak, MI) |
Family
ID: |
23342140 |
Appl.
No.: |
05/342,509 |
Filed: |
March 19, 1973 |
Current U.S.
Class: |
89/14.3 |
Current CPC
Class: |
F41A
21/28 (20130101) |
Current International
Class: |
F41A
21/00 (20060101); F41A 21/28 (20060101); F41c
021/18 (); F41f 017/12 () |
Field of
Search: |
;42/79,76R ;89/14C |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Borchelt; Benjamin A.
Assistant Examiner: Jordan; C. T.
Attorney, Agent or Firm: Harness, Dickey & Pierce
Claims
What I claim is:
1. In combination with a rifle having a relatively long barrel with
a cartridge chamber at one end and a muzzle at the other end with a
rifled bore of constant diameter therebetween, a compensator system
for minimizing gas blow-by, muzzle jump, and recoil comprising a
cylindrical member extending coaxially with and radially outwardly
spaced from said barrel at the muzzle end thereof, a threaded
section on the exterior of said barrel, a complimentary internal
thread on said cylindrical member for seating and sealing one end
of said member to the exterior of said barrel, a circumferential
shoulder on said barrel spaced from the threaded section thereon,
the other end of said cylindrical member being seated in sealing
relation on said shoulder, said cylindrical member in combination
with said barrel defining an annular gas expansion chamber, a
plurality of gas ports extending radially through said barrel
providing a fluid communication path between the bore of said
barrel and the interior of said gas expansion chamber, a pair of
gas discharge vents at the muzzle end of said cylindrical member
extending radially and angularly oppositely upwardly therethrough
so as to provide a fluid communication path between the interior of
said gas expansion chamber and the atmosphere, said gas ports
having a total area at least twice the cross sectional area of the
bore of said rifle and being spaced rearwardly from the muzzle of
said rifle a distance approximately 2 1/2 inches and substantially
less than the spacing between said cartridge chamber and said ports
whereby high pressure gases generated upon firing of a cartridge
propell a projectile through a relatively long path within said
barrel prior to being vented radially outwardly through said gas
ports into said gas expansion chamber, said gases moving forwardly
through said expansion chamber, thence radially outwardly through
said gas discharge vents while the projectile propelled by said
gases is still in sealing engagement with the bore of said barrel
thereby exerting an axial and radial force on said barrel in
opposition to recoil and muzzle jump, respectively, and minimizing
blow-by upon exit of the projectile from the muzzle of the rifle.
Description
My invention relates to sporting and target rifles.
The principal object of my invention is to provide a compensator
system for such rifles which is effective to eliminate both gas
blow-by and muzzle jump and reduce the force of recoil in firing
any rifled firearm equipped with my compensator system.
The foregoing object of my invention and the advantages thereof
will become apparent during the course of the following
description, taken in conjunction with the accompanying drawings,
in which:
FIGS. 1-3 are, respectively, fragmentary side elevational,
fragmentary longitudinal sectional and transverse sectional views
of a compensator system for sporting and target rifles embodying my
invention and shown in use on a high-powered rifle;
FIGS. 4 and 5 are, respectively, longitudinal and transverse
sectional views of a part of said compensator system; and
FIGS. 6 and 7 are, respectively, fragmentary longitudinal sectional
and transverse sectional views of another embodiment of my
invention also shown in use on a high-powered rifle; said FIGS. 3,
5 and 7 being on a larger scale than FIGS. 1, 2, 4 and 6.
Referring to the drawings in greater detail and first to the
embodiment of my invention shown in FIGS. 1-3, the same, which is
generally designated 10, comprises, in the instance, modifications
of the forward end of the barrel 12 of a high-powered rifle having
conventional rifling 14 therein. Said modifications include the
provision of gas chamber means external to the outside diameter of
said forward end of the barrel 12 and changes involving the outside
diameter and wall thickness of said forward end of the barrel 12.
Said changes involving the outside diameter of said forward end of
the barrel 12 consist of an annular shoulder 24, a mating
cylindrical surface 26, a cylindrical undercut section 22 and
threads 16. Said changes also consist of a pair of axially
elongated slots 20 formed through the wall thickness of the forward
end of the barrel 12 and diametrically disposed with respect to
each other on the horizontal diameter of said barrel 12. Said slots
20 serve as gas release ports for the barrel 12 and inlet ports for
said gas chamber means and have an effective area equal to two
times that of the bore of the barrel 12. Said gas chamber means is
formed both by said undercut section 22 and a cylindrical undercut
section 23 formed in the inside diameter of a sleeve 13 which is
held in place on and gas sealed in respect to said barrel 12 by a
mating cylindrical surface 27 and by threads 17 formed in the
inside diameter of said sleeve 13. The undercut section 22 on the
barrel is turned to the minor diameter of thread 16 or less, as
permissible, and the undercut section 23 on the sleeve is bored to
such dimension as will, in conjunction with undercut section 22
create, for the particular caliber of rifle in question, when the
sleeve 13 is assembled to the barrel 12, a gas expansion chamber
equal in cross-sectional area to one and one-half times the area of
slots 20. Said sleeve 13 is fastened in place on the outside
diameter of said barrel 12 by said threads 17 which engage said
threads 16, both of which are extra fine series. The mating
cylindrical surfaces 26 and 27 form a gas tight sliding fit between
each other. The inner end of said sleeve 13 bottoms against the
shoulder 24 when said sleeve is fastened in place on said barrel
12. Said undercut sections 22 and 23 define annular shoulders at
opposite ends of said gas chamber means, the forward one of which
is designated a-1. Said sleeve 13 is provided with a pair of
axially elongated slots 21 formed through the wall thickness
thereof and circumferentially spaced apart from each other, both
disposed above the horizontal diameter of said barrel 12, each at
an acute angle e in respect thereto. The angle e is of the order of
18 to 36 degrees, depending on the barrel weight and the velocity
of the bullet. Said slots 21 serve as outlet port means for said
gas chamber, and have a total area equal to that of the chamber.
Said sleeve 13 may be provided with any suitable iron sight (not
shown) on the top surface outside diameter thereof.
In operation of said compensator system 10, when any rifle equipped
therewith is fired gases vent from the interior of the forward end
of the barrel 12 through the slots 20 and fill said gas chamber
means and produce an axially operative forward force acting upon
said annular shoulder a-1 which opposes recoil of said rifle. Gases
also vent from the interior of said gas chamber means through the
slots 21 into and against the atmosphere and produce a downwardly
operative force acting upon the edges d of said slots 21 which
eliminates muzzle jump of said rifle. The filling of the chamber of
said gas chamber means with gases and the venting of said gases
therefrom is accomplished prior to the bullet reaching the muzzle
of barrel 12 and while said bullet is still sealing the bore of
said barrel, thereby eliminating gas blow-by. As the rifle bullet
passes the slots 20 said escaping gases are those of combustion
from the firing of said rifle. Said combustion gases are backed up
under pressure all the way back to the breech of said rifle and
follow the path of least resistance, i.e., out of the slots 20 and
into said gas chamber means so as to be operative against said
shoulder a-1. As the bullet travels from the slots 20 to the muzzle
of the barrel 12 it has a greater tendency to stabilize due to
relief of the combustion gas pressure behind the same. Greater
accuracy is achieved for this reason and because of the reduction
of turbulence due to the elimination of gas blow-by.
Referring to said other embodiment shown in FIGS. 6 and 7, the
same, which is for smaller bore rifles, is generally designated
110. Parts thereof similar to those of the embodiment 10 are
designated with like numbers except in the 100 series. The inlet
port means for said gas chamber means in this embodiment 110 is
formed of three axially spaced apart sets of aperture means, each
set being in the form of four diametrically spaced apart
cylindrical holes 120, each said hole 120 being formed through the
wall thickness of said forward end of the barrel 112. Two holes of
each set of holes 120 are aligned with the horizontal diameter and
the other two thereof with the vertical diameter of said muzzle
112. The effective area of all of the holes 120 is likewise two
times that of the bore of the barrel 112. The operation of said
compensator system 110 is substantially the same as that of the
compensator system 10, except that the venting of gases from the
interior of the barrel 112 into said gas chamber is through the
holes 120 and an annular shoulder a-2 produces, via the gases which
fill said gas chamber means, the axially operative forward force
which opposes recoil.
It will thus be seen that there has been provided by my invention a
compensator system for sporting and target rifles in which the
object hereinabove set forth together with many thoroughly
practical advantages has been successfully achieved. While
preferred embodiments of my invention have been shown and
described, it is to be understood that variations and changes may
be resorted to without departing from the spirit of my invention as
defined by the appended claims.
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