U.S. patent number 3,808,943 [Application Number 05/247,956] was granted by the patent office on 1974-05-07 for gun-leveling device.
Invention is credited to Larry Kelly.
United States Patent |
3,808,943 |
Kelly |
May 7, 1974 |
GUN-LEVELING DEVICE
Abstract
A handgun and rifle barrel device; said barrel comprising a
cylinder with a bore with trapezoidal slots in predetermined
positions and of predetermined proportions so that a torque
reaction is induced at the discharge end of a gun barrel to prevent
`muzzle jump,` together with an induced anti-recoil action and
reduction of noise and blowback of hot gases.
Inventors: |
Kelly; Larry (East Detroit,
MI) |
Family
ID: |
22937045 |
Appl.
No.: |
05/247,956 |
Filed: |
April 27, 1972 |
Current U.S.
Class: |
89/14.3;
42/76.01 |
Current CPC
Class: |
F41A
21/28 (20130101); F41A 21/36 (20130101) |
Current International
Class: |
F41A
21/36 (20060101); F41A 21/28 (20060101); F41A
21/00 (20060101); F41f 017/12 (); F41c
021/18 () |
Field of
Search: |
;42/76R ;89/14C |
References Cited
[Referenced By]
U.S. Patent Documents
Other References
Roettinger, "Push Back or Flip Up," The American Rifleman, pages 54
and 55, May 1954..
|
Primary Examiner: Feinberg; Samuel
Assistant Examiner: Jordan; C. T.
Attorney, Agent or Firm: Harness, Dickey & Pierce
Claims
I claim:
1. An apparatus for reducing muzzle jump of a firearm having a
barrel section defining a substantially uniform diameter bore
through which a projectile travels under the influence of an
explosive material,
said apparatus comprising at least two passages formed directly
within the firearm barrel section and communicating the bore with
the outer periphery of the firearm barrel and adapted to vent to
the atmosphere at least a portion of the gases produced by the
explosive material upon firing of the firearm,
said passages being non-mechanically formed in the barrel and
arranged one on each side of an imaginary vertical plane extending
longitudinally of the barrel and lying along the axis of the
bore,
said passages further being arranged above an imaginary horizontal
plane extending longitudinally of the barrel and lying along said
axis of the bore,
said passages being of substantially uniform cross-sectional size
and shape and terminating at their inner ends in an unburred and
non-counterbored portion of the firearm bore so as to permit said
gas venting without in any way reducing the ballistic
characteristics of the firearm.
2. The invention as set forth in claim 1 wherein said passages are
of a generally trapezoidal shape.
3. The invention as set forth in claim 1 wherein said passages are
oriented at approximately 30.degree. angles from said imaginary
vertical plane.
4. The invention as set forth in claim 1 wherein the total
cross-sectional area of said passages is approximately equal to the
cross-sectional area of the bore.
5. The invention as set forth in claim 2 wherein said
trapezoidal-shaped passages have spaced parallel sides of major and
minor lengths, and wherein said major length side of each passage
is disposed more closely adjacent said imaginary vertical plane
than said minor length sides.
6. In combination with a firearm barrel having a substantially
uniform diameter bore of predetermined standard cross-sectional
caliber and thereby adapted for use in firing projectiles of a
corresponding caliber,
an apparatus for reducing muzzle jump normally produced upon firing
a projectile through the bore under the influence of an explosive
material,
said apparatus comprising at least two non-mechanically formed gas
ports located directly within the barrel and extending between the
periphery of said bore and the outer periphery of said barrel,
said ports being generally symmetrically oriented within said
barrel and terminating at their innermost ends directly within a
portion of the bore which is of the standard predetermined
cross-sectional caliber so as to in no appreciable way detract from
the normal and expected ballistic characteristics of the firearm
barrel which would be attained in the absence of such ports.
7. The invention as set forth in claim 6 wherein said ports have at
least one relatively straight side which extends upwardly and
forwardly of the axis of the bore.
8. The invention as set forth in claim 7 wherein said ports are
arranged approximately 30.degree. from an imaginary vertical plane
extending through the axis of the bore.
9. The invention as set forth in claim 6 wherein the total
cross-sectional area of said ports is approximately equal to the
cross-sectional area of the bore.
10. The invention as set forth in claim 6 wherein said ports are of
a general trapezoidal shape and have spaced parallel sides of major
and minor lengths.
Description
BACKGROUND OF THE INVENTION
This invention relates to improvements in the slotting of gun
barrels so as to reduce recoil and jumping of the firearm. Previous
attempts, such as the anti-recoil gun barrel of John F. Mutter,
U.S. Pat. No. 2,916,970, use a series of small rearwardly inclined
drilled holes to produce a similar effect but the same have
resulted in `blow back` of hot discharged gases toward the operator
of the firearm and a nozzling of the gases resulting in increased
noise.
SUMMARY
It is the primary object of the present invention to provide a
slotted gun barrel which will substantially prevent pistol or rifle
`jump` without discharge of hot gases and flame either at the
operator or those standing nearby.
It is another object of the present invention to eliminate in part
recoil of the firearm with minimal blowback and a reduction in
sonic waves with attendant noise.
Another object is to improve the accuracy of the firearm by
eliminating flinching by the operator due to muzzle `jump` and
recoiling.
Still another object is to allow increased firing speed for greater
fire power by keeping the gun barrel leveled on target for
repetitive shooting.
For further objects and for a better understanding of the
invention, reference may be had to the following detailed
description taken in connection with the accompanying
drawing(s):
DESCRIPTION
FIG. 1 is a fragmentary perspective view of a gun barrel embodying
the features of the present invention.
FIG. 2 is a fragmentary longitudinal section taken on Line 2--2 of
FIG. 1.
FIG. 3 is a cross section taken on Line 3--3 of FIG. 2.
FIG. 4 is a fragmentary view gun barrel substantially perpendicular
to Line 4--4 of FIG. 3.
FIG. 5 is a front view of the gun barrel showing electrodes in
place forming the slots employed in this invention.
Referring now to the accompanying drawing in more detail,
particularly FIGS. 1-4 thereof, the gun barrel is designated
generally by the reference numeral 10 including the bore 12 and
front sight 13.
The muzzle or front end of the barrel 10 is provided at the top
with a radially disposed trapezoidal slot 11 on either side of the
sight 13, said slots 11, extending through to the bore 12, and on
the other side of the barrel disposed on radials approximately
30.degree. from the upper centerline of the barrel 10 and
communicating with the gas chamber of the gun.
In operation, after firing of the gun, the exploded gases expand in
the barrel until reaching the slots 11 in the barrel 10 where a
portion of the gases escape in an upward direction with respect to
the barrel 10. The slots 11 being at the top of the muzzle end at
the barrel 10, cause a reaction force tending to depress the
muzzle. The result of this torque is to counteract the force set up
by the recoil at the barrel 10 above the line of support. The
forward motion of the exploded gases striking the forward portion
of the trapezoidal slots 11 unexpectedly results also in inducing a
reaction force directed forward against the recoil force. It has
been found that the cross-sectional area of slots 11 must be equal
to or greater than the area of the bore 12 in order to prevent
choking or nozzling of the exploded gases resulting in acceleration
of the gases with attendant increase in noise levels and flame
directed at the operator or others nearby.
Referring to FIG. 5, the electrodes 20 are shown in position on the
barrel 10. The electrodes 20 are connected to a low voltage high
amperage source; the barrel to the opposite pole of the source. The
gun itself is submerged in a non-conducting fluid to cool the gun
barrel and to rinse away particles. This process is commonly known
as electrical discharge machining or EDM. It has been found by the
present inventor that EDM eliminates burrs left by commonly used
procedures such as milling or drilling and consequently to
reblueing or replating is required or lapping the surface to remove
burrs. This reduces the cost of producing this invention by
approximately one half.
It further has been found in tests that the desired configuration
with slots which collectively equal in area the area of the muzzle
bore cross section or are greater than said area, substantially
reduces noise of the firing and results in up to a 35 percent
reduction in muzzle jump and seven percent reduction in recoil.
* * * * *