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Патент USA US2405207

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2,495,207
S. G. G R E E N
GUN FEED MECHANISM
Filed July 29, 1942
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2,405,207
GUN FEED MECHANISM
Filed July 29, 1942
’7 Sheets-Sheet 2
.Samuel Ek. Eres-:ln
Aug. 6, i946,
s. G. GREEN
2,405,207
GUN FEED MECHANISM
Filed July 29, 1942
'7 Sheets-Sheet 3
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GUN FEED MECHANISM
Filed July 29, 1942
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2,405,207
GUN FEED MECHANISM
Filed July 29, 1942
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s. G. GREEN
2,405,207
GUN FEED MEGHANISM
Filed July 29, 194.2
‘7 Sheets-Sheet 6
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S a G RE E N
2,405,207
GUN FEED MEGHANISM
Filed July 29, ‘1942
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2,405,207
Patented Aug. 6, i946
UNITED STATES PATENT OFFICE
2,405,207
GUN FEED MECHANISM
Samuel G. Green, Gray, Ga.
Application July 29, 1942, Serial No. 452,764
(Cl. 89-33)
(Granted under'theV act of March 3, 1883, asVV
7 Claims.
amended April 30, 1928; 370 0. G. 757)
1
The invention described herein may be manu
factured and used by or for the Government for
2
Other objects of the invention are: to provide
a power booster feed which utilizes the. tremen
governmental purposes, without the payment to
dous power available in the recoiling barrel of
me of any royalty thereon.
many types of guns or the available force in the
gas piston of a gas operated gun; to provide a
dual feed for an automatic weapon with means
for taking the heavy belt lift load olf the conven
This invention relates to a gun feed mechanism
and more particularly to an auxiliary ammuni
tion feeding device directly coupled to the main
power source of a machine gun or other auto
matic weapon, andr represents a continuation-in
part of my application, Serial No. 440,582, filed
April 27, 1942.
Modern warfare demands exceptionally high
speed automatic weapons and hence necessitates
an abundant and immediately available supply
of ammunition which may be threaded to the
gun. Long belts or interconnected links of pro
jectiles are required, particularly on aircraft and
other combat vehicles that are employed on long
tional time feed mechanism (driven members)
and lifting the belt load _by the barrel, barrel eX
tension, or the gas piston assembly (driving
members); to relieve the driven members of the
gun (bolt, feed slide, etc.) of the conventional
drag and consequent delicate balance which is
required to get proper operation; to provide a
feed booster that can be readily applied to guns
that feed either from the right-hand or the left
hand side; to use the same basic gun mechanism
for a high speed gun or for a low speed gun; to
provide a power booster feed for lifting the heavy
quantities of ammunition. It is imperative that 20 belt on recoil to the feeding stage whereby the
conventional feed mechanism is in a position to
a strong, positive feed mechanism be employed
engage the belt and advance a small section
to present the projectiles progressively to the gun
thereof in accordance with its normal sequence
without impairing its normal high speed func
of operation; to provide an overthrow arrange
tioning. An ideal arrangement for an automatic
range and other missions which consume large
Weapon is attained when the gun incorporates a 25 ment in the power feed device which will insure
the introduction of slack into a section of the belt
self-contained feed unit which eliminates all
adjacent the conventional feed mechanism so as
outside sources of power to feed or accommo
to materially diminish the feeding effort load of
date the heavy belt load imposed on the weapon._
the latter mechanism; to overcome the undesir
It is therefore the purpose of this invention to
provide a power booster feed which is directly 30 able stretching of the belt which produces an eX
cessive pitch distance between the cartridges in
coupled to the main power source of the gun, per
the proximity of and Within the influence of the
forms the heavy belt lifting operation, and per
conventional feed mechanism; to provide means
mits the conventional feed mechanism to move
for using the available recoil force of the primary
a comparatively negligible load of but a feW
cartridges.
35 driving member of an automatic weapon for lift
ing heavy belt loads without slowing down the
An object of this invention is to provide a pow
operation of the gun; to overcome the objection
er feed or lift which is directly connected with
able retardation of the bolt and the normal feed
the power source of an automatic gun, namely,
mechanism by relieving the bolt, a momentum
the recoiling barrel or its associated barrel ex
tension of the gas piston of a gas operated gun. 40 driven member, of its heavy load on the counter
recoil stroke; to obtain a higher rate of fire from
Another object of the invention is to provide
the gun and to provide means for securing more
a powerful, compact, auxiliary feed mechanism
uniform velocity and acceleration of the bolt,
for boosting ammunition lifts to a machine gun
thereby reducing to a minimum the impact forces
or other automatic weapon.
It is an object of this invention to make full 45 delivered to the receiver of the gun; to obtain a
uniform, belt power lift independent of the gun
use of the conventional timed feed mechanism
frame recoil or the elevation of the gun; to in
of guns such as the Browning or Vickers in con
crease the rate of ñre of standard machine guns
junction with the instant power feed mechanism.
Without altering their present space limitations;
It is an object of the invention to provide an
auxiliary feed mechanism for an automatic fire 50 to accomplish regulation and maintenance of gun
feed timing independently of the bolt; to provide «
arm to carry the main load of advancing the am
a
comparatively simple, sturdy feeding device
munition belt, and which mechanism shall have
which may be coupled to a standard machine gun
an increased time of impulse. And it is a further
with little alteration in its structure to provide
object of the invention to provide such a mecha
55 greater eiiiciency, as well as an increased rate of
nism with a resilient coupling.
2,405,207
3
.
ñre; to provide a smooth functioning, power
feed mechanism that is directly coupled to a ma
chine gun and which is adapted to feed a belt
auxiliary feed mechanism,
Fig. 23 is a top plan View of a modified aux
iliary feed mechanism mounted on the left side
from a location substantially on- the same level
as the conventional feed mechanism of the gun;
4
Fig. 22 is a detail of the operating arm for the
5
and to provide an auxiliary feed mechanism
which can be used with a barrel accelerator yonan automatic gun to provide a maximum rate of
ñre with a maximum belt load.
of a machine gun, and
Fig. 24 is a section taken on the line 24-24 of
Fig. 23.
Referring to Fig. 1, there is shown a family of
bolt displacement-time curves for a Browning
cal. 50 machine gun under four conditions of
operation. Curve A approximates the actual
The specific nature of the invention as well asV
other objects and advantages thereof will clearly
appear from a description of a preferred embodi
ment ras shown in the accompanying drawings in
which:
Fig. 1 represents a family of characteristic
bolt displacement-time curves for a BrowningV
cal. 50 machine gun under several conditions of
photographic representation of the bolt displace
ment-time curve obtained when a cal. 50 Brown
ing gun ñred at a rate of about 600 rounds per
minute. Curve B represents a similar curve for
a gun which vis employed in conjunction with an
ordinary power booster feed. Curve C illustrates
.the characteristic curve for a self-contained dual
operation,
Fig. 2 is a side yelevational view of the power `
feed gun constructed in accordance with the
feed mechanism mounted on the right side of a 20 present invention wherein the power feed is oper
Browning machine gun adjacent the standard
ated from the recoiling barrel.
belt feed mechanism,
acteristic of a gun which incorporates a device
ofl the present invention in conjunction with a
'
Curve D is char- '
jV Fig. 3 is a top plan view thereof,
Fig._ 4 is a view in side elevationrof feed mecha
barrel accelerator, preferably of the type em
nism assembled on the right side of a Browning 25 bodied in the applicant’s copending application,
machine gun, the cartridge guide being removed
Serial No. 302,553 filed Nov. 2, 1939, now Patent
and a portion of the base plate appearing in
No. 2,362,996.
section to illustrate the simplicity of attachment,
Considering curve A, a cycle of operation, which
. lFig. 5 is a vertical sectional view through the
includes recoil and counterrecoil, takes place in
gun and power feed mechanism on the line 5-5 30 about one-tenth of a second. The recoil portion .
of Fig. 2 looking in the direction of the muzzle
slopes upwardly and reaches a crest which marks
end of the gun,
the end of the recoil stroke and then the curve
Figs. 6 and 7 are sectional views on the lines
declines thereby outlining the counterrecoil por
6-6 and 1_7 respectively of Fig. 2,
,
. Y
tion. It will be observed that the recoil section
Fig. v8 is a sectional view through the base plate
on the line 8_8 of Fig. 4 looking in the direction
ofthe arrows,
-Fig. 9 is a sectional view through the cartridge
of the curve includes portions r and s which have
different slopes. Portion r represents the recoil
of the barrel, the barrel extension, and the bolt
as a unit. The s segment represents the recoil
of the bolt alone under the influence of the ac
guide on a plane corresponding to the section on
line 8-~8 through the base plate,
Fig. y10 is a View in side elevation of the bell
40 celerator and the retardation by the bolt driving
spring.
Since the slopes of these two portions
Ycrank lever,
of the recoil half of the curve are different, they
Fig. 11 is a sectional view thereof on the line
represent unequal velocities and a knee is pro
ll-II of Fig. 10,
'
duced which includes the transition point t. A
, Fig. 12 is a top plan view of a modified aux 45 more desirable operation ofy the gun occurs when
iliary feed mechanism mounted on the left side
the bolt has a more uniform velocity and acceler
of a Browning machine gun and arranged to feed
ation. Virtual elimination of the knee from the
a cartridge belt from an area to one side of the
recoil half of the cycle will improve operation.
gun,
One manner of accomplishing Vthis will be men
_ Fig. 13 is a side elevational view thereof,
Fig. 14 is a vertical sectional View on the line
50 tioned subsequently.
The counterrecoil portion of curve A occupies
llt-,I4 of Fig. 12,
a greater time interval than does the recoil sec
` Fig. 15 is a View in side elevation of a portion
tion thereby indicating that the time consumed
of the left side of a gun illustrating the simple
in counterrecoil is greater than that in recoil.
manner in which the standard gun is modified 55 A change in slope in the counterrecoil half of the
to receive the power feed attachment,
>curve is indicated by the knee at the transition
Fig. 16 illustrates diagrammatically in axial
point t’ and the flattened portion r’. A more de
section a barrel accelerator mounted on the
sirable condition exists when the slope of r’ ap
muzzle end of a gun barrel,
proximates that of s’. Speeding up the rate of
Fig, 17 is a diagrammatic showing of another 60 ñre will aid in accomplishing this.
. v
means for imparting vertical reciprocation to the
When a conventional auxiliary or booster feed
power feed slide from the axial reciprocation of
mechanism is employed with a machine gun of
the barrel extension,
e
.
~
the Browning type, a bolt displacement-time
Fig. 18 is a similar representation of meansfor
curve similar to the B curve is characteristic of
actuating the power feed slide transversely of the
such an organization. The recoil portion of the
axis of the gun from the longitudinal movement
curve is unaffected but it will be noticed that the
of the barrel extension,
counterrecoil period is shortened. An increased
Fig. 19 isa View in side elevation of a modified
form of auxiliary feed mechanism assembled on
the right side of a machine gun, the cartridge
rate of fire as compared with the standard gun
will result since the belt load on the gun feed
mechanism, which feeds on counterrecoil, is re
guide being removed,
Fig. 2O is a section taken on the line 2li-20 of
Figure 19 with a belt of cartridges added,
Fig. 21 isa section of the auxiliary feed mecha
nism taken on the line 2 I--Zl of Figure 19.
75
duced. However, the conventional booster feed
is customarily associated with the gunand its
belt in such a manner that a considerable load
exists on the standard gun feed mechanism which
derives all of its feeding force from the energy
2,405,207
E
B
stored in the bolt and the bolt driving spring.
Since the space limitations of the gun determine
the size and strength of the bolt driving spring,
6
assembly comes to rest` Therefore, the knee of’
the curve is virtually eliminated. As a result of
the faster recoil of the barrel, the crest of the
it is highly desirable to reduce to a minimum the
curve is reached sooner resulting in its displace
feeding load on this spring,
UX ment to the left of the other curves as shown in
This is successfully accomplished by having the
auxiliary feed mechanism lift the heavy belt load
Fig~ 1. Hence the barrel accelerator improves
and shortens the recoil portion of the curve while
on recoil and associating this mechanism with the
the dual feed mechanism improves and shortens
the counterrecoil half of the curve. Their com
gun in such a manner that the load on the stand
ard feed mechanism of the gun, which operates
bined effect is to materially shorten the time cycle
on counterrecoil, is at a minimum, Since tre
between rounds and hence increase the rate of
mendous energy is available in the recoiling barrel
fire. The muzzle booster, by eliminating the knee
(a direct power source) and much is ordinarily
in the recoil portion of the curve, provides a more
dissipated, this wasted energy can be utilized to
uniform velocity and acceleration of the bolt and
lift the heavy belt load. Only a small fraction
reduces to a minimum the impact forces delivered
of this available energy in the recoiling barrel is
to the frame of the gun. The combined result is
necessary to move a heavy belt, and the proper
that the .50 cal. gun is able to operate smoothly
utilization of this energy can be employed to in
at a rate of about 1200 rounds per minute.
crease the efficiency and the rate of lire of the
The addition of momentum to the barrel at the
gun. This is achieved by coupling the booster feed 20 time of recoil of the interlocked barrel, barrel
directly to the recoiling barrel or barrel extension
extension, and bolt is most desirable as may be
immediately adjacent the belt feed passage in the
noted from an examination of curves A, B, and C
gun so as to provide a dual feed mechanism which
of Fig. l. Since the slope of the curves represents
is integral with the gun structure and independent
velocity, an increase in momentum through the
of all external and often unreliable power sources.
use of a barrel accelerator is most advantageous
As will be shown and described in another part
since this is the low velocity part of the curve.
of the specification, arrangements are provided
wherein the load on the conventional feed mech
anism comprises but a few cartridges, and hence
a negligible load for the standard bolt driving
spring. This enables the bolt and associated feed
mechanism to operate at practically no-load con
ditions and at a uniform and higher velocity
thereby materially increasing the rate of fire.
Curve C illustrates the bolt displacement-time
curve of a gun embodying the present invention.
The incorporation of the auxiliary feed mecha
nism and the barrel accelerato-r, if the latter is
desired, into the standard gun permits the gun to
be timed more perfectly, the rate of nre is in
creased, and less stress is placed on the feeding
and timing elements of the gun. All outsideV
sources of power to assist in the feeding of the
belt are eliminated. This insures reliability of
functioning since the booster feed mechanism
fails to operate only when the gun fails to ñre.
The compactness of this self- contained power feed
Since the belt load is included within the recoil
portion of curve C, the curve will be somewhat
unit and machine gun will be made obvious in a
flatter than the corresponding portion of curve A
succeeding portion of the specification. In brief
and it will reach its crest slightly later. This 40 it may be stated that the instant booster feed
indicates the recoil period is a bit longer than that
utilizes a portion of the wasted energy of the
for a standard machine gun which does not in
recoiling barrel for power feed purposes, speeds
corporate the present power feed device. How
up the rate of fire, and in addition permits a
ever, since the bolt is permitted to operate in
more accurate regulation of the feeding and tim
counterrecoil under practically rio-load condi
ing of the gun independently of the bolt. Since
tions, the slope of the counterrecoil half of this
the power feed stroke is derived entirely from the
curve will be appreciably steeper. This indicates
recoil of the barrel, the belt power lift will be inde
a greater velocity and hence the consumption of
pendent of the elevation of the gun and also the
a considerably smaller interval of time toI feed a
gun frame recoil. This is because the recoil stroke
new cartridge to the receiver and for the gun to
of the barrel is constant in length and does not
get back in battery. Since the counterrecoil
vary with the elevation of the gun.
period has been materially reduced, the time con
While the present trend is toward guns having
sumed for the entire cycle will be diminished
a higher rate of ñre, it is toy be understood that
thereby achieving a substantial increase in the
the instant power feed arrangement is suited for
rate of fire over that for guns including dual feed
use with low speed as well as high speed guns.
mechanisms of the prior art. The increased speed
A smooth operating low speed gun is made possible
of operation virtually eliminates the knee which
since the belt retardation on the bolt is overcome.
customarily appears in the counterrecoil portion
The velocity of recoil of the barrel can be reduced
of a bolt displacement-time curve.
When a barrel accelerator 9 (shown diagram
matically in Fig. 16) is employed on the muzzle
end of the barrel Iêl of a Browning machine gun
which is provided with the instant dual feed mech
anism, a bolt displacement-time curve similar to
curve D is obtained.
The accelerator or muzzle
booster imparts added momentum to- the recoil
ing barrel by increasing the velocity of recoil.
This added energy can be used to move a greater
by adding barrel weight and also by the omission~
60 of a recoll booster thereby creating a low speed
gun.
Referring to Fig. 5, there is represented a trans
verse section through an automatic gun which is
provided with a barrel I9 arranged to reciprocate
w1thin certain limits in a trunnion block I I. This
barrel constitutes the main power source or the
p_rlmary dl’lVlIlg member of the gun. A pair 0f
side plates I2 are fastened to the trunnion moet(
belt load but is far more useful in smoothing
by suitable means such as rivets (not shownl.
out the knee in the recoil half of the curve and 70 Positioned above the barrel are the conventional
in reducing materially the recoil period.
The
action of the buffer mechanism on the faster re
çal’tfldge feed passage I3, the belt feed slide Il!
its associated belt feed pawl I 5, and the belt hold.y
coiling interlock barrel, barrel extension and bolt
mg pawl I 6. Resting against the right-hand Side
issuch that less relative velocity is imparted to the 75 plate I2 of the gun is a substantially flat base plate
bolt through the accelerator after the interlocked
I'I which is secured to the gun by a bolt and nut
2,405,207
arrangement I8----I8'; see also Figs. 4 and 6.' Bolt
I8 passes through aligned holes I9-I 9 in the side
plates and the depending legs 20 of thetrunnion
the right hand side plate I2 of the gun and the
pin reciprocates therein concurrently with the
block II so that the reciprocating of the gun
and counterrecoil. Pin 53 is press fitted in a bore‘
barrel will not be impeded. The head'of the bolt
I8 is arranged to rest in a countersunk or recessed
seat 2I in the body plate I1. As shown in Fig. 4
rel extension. A second slot 54’ appears in the
left-hand side plate I2 so as to permit the pin
a pair of bores 22 are provided in the upper and
53 and connecting rod 49 to be mounted on the
opposite side of the gun in an instance which will
lower edges adjacent the left end of the base plate
movements of the barrel extension 52 in recoil
55 which extends transversely through the bar
pin 23 which is carried by the usual belt holding
be subsequently mentioned. An outwardly bowed
bracket 56 is secured to the side plate of the
pawl pin 24 on the gun. A hole 25 is provided in
/gun `by a pair of set screws 51 which are fastened
I1. One of these is arranged to receive a dowel
in threaded recesses 58. Similarly positioned re
the dowel through which the pin 24 is thrust.
cesses appear in the opposite side of the gun.
This pin and bore arrangement promotes a quick
alignment of the base plate on the side of the 15 Bracket 56 functions as a guide for one end of'
the connecting rod.
gun during the assembling operation.
Y
1
Cartridge guide 42, which comprises a sub
The front face of the base plate l1 is provided
stantially U-shaped member (Fig. 9), is provided
With a recessed guideway 26 which receives a
with a lug 59 that is centrally disposed on one
reciprocating power feed slide 21. The guideway
26 is undercut on the side portions 2S (Fig. 8) to 20 end and has a bore 69 adapted to receive pin 4I
thereby permitting pivotal mounting of the guide
produce a pair of vertical flanges 29 which con
on the base plate I1. The opposite end carries
fine the power feed slide 21 in the channel dur
a pair of attaching lugs 6I which are arranged
ing its reciprocatory movement. Intermediate
to span lug 43, on the base plate I1. These lugs
the top and botto-m edges of the base plate and
adjacent the left end thereof is a bore 30 having 25 have aligned, pin receiving bores 62. When the
guide plate 42 is swung closed as shown in Figs.
a recessed seat 3l that is adapted to receivea set
l and 2, an expanding pin 63 can be inserted
screw 32 which acts as a pivot for a bell crank
so as to lock the members together. In this posi
lever 33. The threaded end 34 of the set screw
tion the guide 42 and the base plate I1 denne a
is retained in a complementary threaded bore
(not shown) in the side plate l2 of the gun. The 30 passageway substantially conforming to the
shape of a cartridge as shown in Fig. 3. A pair
other side plate o-f the automatic weapon car
of vertically extending ribs 64 and 65 on the base
ries a similarly disposed bore for a purpose which
plate and the cartridge guide respectively serve
will be explained hereinafter. The back face of
as aligning means for the neck end of cartridges.
the base plate I1 is conditioned with a generally
triangular shaped recess or cut-out portion 35 35 The cartridge guide is preferably flared at its top
and bottom to facilitate ingress and egress of a
which permits anl arm 36 of the bell crank 33
that is coupled to the power feed slide 21 to oscil
late therein; see Figs. 4, 5 and 8. Arm 36 has
an elongated aperture 31 which receives a cylin
rapidly moving cartridge belt. Midway between
the top and bottom edges of the cartridge guide
feed slide 21 to effect a pivotal coupling between
those two members. Aperture 31 is oval in shape
with the major axis disposed substantially hori
zontally to compensate for the arcuate movement
pair of spaced'brackets 68 are mounted adjacent
the web portion and journal a pin 69 which car
ries a spring pressed holding pawl 10. Coil spring
1I is arranged to urge the cartridge engaging end
12 through the upper of the pair of holes 66--66.
A cotter pin 13 prevents the pawl pin 69 from
working out of its bracket supports. The pur
pose of the lower hole 66 will be subsequently
elucidated.
are a pair of rectangular holes 66-66 (Figs. 2 and
drical stud 38 threaded into the rear of the power 40 5) which are separated by a web portion 61. A
of the arm 36 when the power feed'slide 21 is
reciprocated vertically. The right-hand end of
the base plate is provided with a pair of spaced
lugs 39 which have aligned bores 45. These act
as hinge elements and receive a pin 4I which is
When it is desired to convert the gun to a left
arranged to secure a cartridge guide 42 thereto 50
hand feed, the pin 53 is driven out of its bores
in the manner illustrated in Figs. 2 and 3. The
in the barrel extension 52. Bowed bracket 56
left end of the base plate I1 has a single lug 43
is removed .by backing off screws 51. By swing
with a vertically disposed hole 44 and constitutes
ing open the cartridge guide 42 on its hinges, the
one of the lock elements for the cartridge guide
bolt and nut fastener Iii-I8’ and the set screw
42 as will be explained in more detail later.
32 may be removed, thereby permitting the base
Power feed slide 21 is a. substantially U-shaped
plate I1 to be detached from the side of the gun
member as represented in Figs. 4 and 8 and is
and from engagement with dowel pin 23.
adapted to reciprocate in its guide channel 26.
The feed mechanism on the gun is then con
Parallel side walls 45 journal a pawl pin 46 which
carries a power feedpawl 41 in pivotal engage 60 verted to a left-hand feed as follows. Dowel pin
23 is slipped over the belt holding pawl pin 24 on
ment thereon- A spring 43 is coiled about a por
the left side of the gun. Base plate I1 is then se
tion of the shaft to yieldingly urge the pawl out
cured to the gun by inverting it and slipping bolt
wardlyV in a cartridge engaging relationship as
I8 through from left to right and tightening nut
is shown more clearly in Fig. 5. The upper arm of the bell crank lever 33 is con 65 I8’. This is possible since the plate is symmetrical
about a horizontal line through the bore for bolt
ditioned with a countersunk aperture 33’ and is
I8 and also because of the second bore 22 in one
secured to a connecting rod 49 by a <flat headed
edge of the plate. Pin 50 is removed thereby dis
pivot pin 59 which passes through'the aperture
connecting the connecting rod 49 from bell crank
and is retained in position by suitable means such
lever 33. The connecting rod is turned over and
as a cotter pin 5I; see Figs. 3, 4 and 11. The
coupled to the bell crank by pin 50. The opposite
connecting rod extends alongside the side plate
end of the connecting rod is then secured to the
I2 of the gun and is coupled at its lower end
left side of the barrel by driving pin 53 into bore
to the barrel extensionA 52 of the gun by a pin
55. Bracket 56 is attached to the left side plate
53; (see Figs. 2, 3 and 11). The headed end of
of- the gun by tighteningscrews 51 into the re-A
the pin extends through an elongated slot 54 in
2,405,207
9
10
cesses provided therein. The bell crank is then
I5 of the gun move to the left (Fig. 5) and ad
vance a small section of the belt to present a new
cartridge to the receiver. The load on the con
ventional feed slide is almost a negligible one
secured to the base plate by pivot pin 32 and the
power feed slide 2'I is inverted in its guideway
and coupled to the bell crank. Since the holding
pawl 'IU on the cartridge guide is up-side-down, it 5 since it comprises the belt section between the
must be inverted so as to project through the
feed pawl I5 of the gun and the holding pawl 'I5
other of the two holes
This is accomplished.
of the auxiliary feed mechanism. The presence
by removing pin 65 from the brackets 53 and re
of the bight A above the holding pawl '5% of the
versing the pawl. Pins 53 and 4I are prefer
power feed mechanism eliminates any tension in
ably inverted in the ends of the cartridge guide II) the belt in the immediate vicinity of the cartridge
although this is not absolutely necessary. The
feed passage of the gun and insures a free and
gun is now conditioned for a left-hand feed. It
easy delivery of ammunition to the gun. This
will be observed that this transposition is effected
permits the conventional timed feed mechanism
by the use of but a few simple tools.
of the gun to function at all times at a high and
The operation of the power feed mechanism
uniform rate of speed. The length and weight
(set for right hand feed) in conjunction with the
of the entire belt is no longer a factor affecting
the speed of operation. As shown in Fig. 5 the
threaded
gun is asthrough
follows.
the power
First feed
a cartridge
mechanism
beltinto
load consists of five cartridges. The feed stroke
the standard feed mechanism and in the general
of the slide I4 takes the slack or bight out of
manner shown in Fig. 5. When the gun is fired 20 the belt section above the holding pawl 7D. When
the barrel I0 and the barrel extension 52 recoil
the gun is fired again, recoil introduces a bight
in the fixed trunnion block II. This backward
A in the belt in the manner previously mentioned
movement (to the left in Figs. 2-4) of the bar
and counterrecoíl feeds a cartridge to the re
rel extension pulls pin 53 toward the rear of slot
ceiver and removes the slack above the holding
54 and acting through the connecting rod @i3
rocks the bell crank 33 about its pivot pin 32.
pawl 1D.
`
It is often desirable to feed a cartridge belt
from a location substantially on the same level
as the conventional feed mechanism of the
This lifts arm 36 of the bell crank and elevates
the power feed slide 27 and its associated feed
pawl 4l in the guide channel 26. Power feed pawl
Browning automatic rifle. Figs. 12-14 illustrate
¿il engages behind a cartridge in the cartridge ‘
a power feed mechanism which is adapted to
guide and carries the belt upwardly. Holding
pawl 'Ie'l ratchets over the oncoming cartridge.
The movement of the power feed slide is sufficient
to lift a new cartridge above the holding pawl
and to provide a loop or bight in the cartridge belt L
as shown in phantom and designated as A in Fig.
5. The creation of this bight constitutes an im
portant feature of the invention as will be men:
tioned shortly. Slide 21 is provided with a little
overthrow so that it actually feeds a distance
slightly greater than the normal pitch distance
between a pair
to compensate
in the clips or
stretch which
length. When
of cartridges in the links. This is
for any dimensional irregularities
advance a belt from such a location to the stand
ard gun feed mechanism. The device includes
a substantially right-angular bracket structure
'I4 which has one of its ñanges 'I5 secured to
the side plate I2 of the gun by four set screws
76. The outer end of the bracket has a hori
zontal sleeve -I‘I which provides a feed passage 'I8
which is aligned with the feed passage i3 in the
gun. The top face of the sleeve 'I'I has pivotally
mounted thereon and partially projecting
through an aperture therein a holding pawl 'I9
which is normally sustained in a cartridge enga-g
ing position by a spring 8D. The lower inner
belt sections and to allow for the
occurs in a belt of considerable
the slide is lowered (as will be dew
1.1 slidably retains a power feed slide 82 which is
scribed subsequently) the belt drops back slightly
and is held against retrograde movement by the
slide carries a spring pressed, pivotally mounted
holding pawl 'lf2 which engages behind a previously
advanced cartridge. The flared exit in the car«
tridge guide enables its adjacent cartridge belt
section to assume the shape of a loose, unten
sioned bight. It will be observed that the angular
disposition of the power feed slide with respect to
the conventional feed slide on the gun promotes
the formation of a bight in the ñexible cartridge
belt.
While Fig. 5 illustrates a comparatively small
bight or loop, the cartridge belt may be threaded
surface 8| of the sleeve -I‘I acts as a shelf and
adapted to reciprocate thereon.
The power feed
power feed pawl 83 which projects through a
narrow elongated hole 84 in bracket ‘I4 and ad
vances the cartridge belt when the slide is re
ciprocated. The inner end of this slide is pro
vided with a sleeve 85 with a bearing surface
having the general shape of an elliptical cylin
der. This journal is adapted to receive the cylin
drîcal end 86 of a bell crank lever 8T. This lever
is provided with a hollow hub 88 which is pivot
ally mounted on a vertically disposed pin 89 which
is journalled in the bracket structure ‘I4 at one
side thereof. An enlarged head Si) retains the
to the gun so that a slightly larger loop of car (Si) upper end of the pin in the bracket while the
-rídges is available above the power feed holding
lower end carries an expanding pin 9| in a suit
pawl 7S.
able transverse bore thereby locking this assem
During recoil of the gun, the conventional feed,
in position. The other arm 92 of the bell
slide I4 of the gun is advancing to the right (Fig.
crank 81 extends toward the side of the gun and
5) preparatory to picking up a‘ new cartridge.
has a rounded end 93 which is arranged to fit
Holding pawl I5 functions in its customary man
in a notch or recess 94 in the barrel extension 52
ner. On counterrecoil the barrel if! and barrel
of the gun.
extension come back in battery and the conThe sleeve ‘I'I is flared at its ends 95 and 95
necting rod 4S and bell crank
are returned to
to promote the ingress and egress of the car
the positions illustrated in Figs. 2~ and 4. The
tridge belt. The bracket ‘I4 is provided with an
power feed slide and pawl assume the position
arcuate hump or deñector 97 adjacent the fiared
shown in Fig. 4.
~
mouth 95 of the sleeve for a purpose which will
be subsequently mentioned. The hump is dis
During counterrecoil of the gun, the standard
feed mechanism operates to feed a new cartridge
posed transversely of the bracket and substan
tially parallel to the axis of an approaching car
to the receiver. Fee’d slide i5 and the feed pawl
2,405,207:
12
11l
tridge. Secured to the bracket 14 is an upwardly
bent leaf spring 98 which lies substantially in
the path of a cartridge belt which is to be fed
into the conventional feed passage I3 of the gun.
This power feed mechanism requires but a few
I0 and barrel extension 52 into battery rocks the
bell crank lever 91 so that the power feed pawl '
83 is ratcheted back to the position illustrated in
Fig 14. During counterrecoil the conventional
feed mechanism on the gun pulls the belt toward
the receiver to present a new cartridge thereat.
simple modifications in a standard machine gun
This movement ñattens the uplifted bight with
to permit its attachment thereto. Fig. 15 illus
such rapidity that this section of the belt would
trates the portion of the gun that the power feed
ordinarily slap against the bracket 14 with con
mechanism is secured to. Four holes 99V are
drilled and threaded in the side plate` I2 of the 10 siderable momentum. The upwardly bent leaf
spring Sßis interposed between 'the belt section
gunto receive the four set screws 16 which hold
and the upper face of the bracket 1li to absorb
the bracket 14 on the gun. An elongated slot
the shock load. This reduces vibration and
|00 is cut in the side plate, and in back of the
steadies the gun. When the gun returns 'to bat
slot the recess 94 is cut in the Ybarrel extension
52 to receive the rounded end 93 of the arm 92 15. tery it is fired again and the previously described
of the bell crank. These five comparatively
simple machining operations are all that are
cycle of operati-ons is repeated. The bight illus
trated in Fig. 14 is merely representative and may
be slightly larger if desired.
'
'
required to condition the standard gun to receive
While a bell Ycrankv arrangement has been de
the side feeding power feed mechanism.
The operation of this auxiliary feed mechanism 20 scribed as the means for coupling the barrel eX
tension to the power feed slide for actuating the
is as follows: When the gun is fired the barrel
slide, other mechanical organizations are feasible
I0 and the barrel extension 52 recoil in the fixed
and will suggest themselves to one skilled in the
trunnion block. As shown in Fig. 12 the move
art. 1n Fig. 17 the lower part _of the barrel ex
ment of these members in recoil is to the right.
Bell crank 81 is effectively coupled to the barrel 25 tension 52 is conditioned to provide a rack 99
which engages a spur gear IUI! rotatably mounted
extension and moves therewith since its end 93 is
lodged in recess 94.
Hence recoil of the gun
barrel rocks the bell crank >thereby permitting the
arm coupled to the power feed slide 82 to move
the slide in its guideway in bracket 14 toward
the axis of the gun barrel. In so doing the power
about its axis` im in the frame of the gun. A
lever arm H32 is coupled to the gear and a feed
slide its whereby axial reciprocation of the barrel
extension will raise and lower the power'feed
slide.
‘
A similar arrangement is illustrated 'diagram
matically in Fig. 18 and is adapted for optional
tridge in the belt and advances Vthe entire belt a
right or left hand feed slide ID3 reciprocates in a
distance equal Vto the pitch distance between
links. The holding pawl 19 ratchets over a car 35 horizontal plane as in the device shown in Fig. 12.
The barrel extension 52 has a pair of racks 99
tridge which is being advanced and then drops
feed pawl 83 on the slide engages behind a car
1läehind it to prevent backward movement of the
elt.
’
in opposite vertical sides. A spur gear 10D is ar
ranged for mounting in the frame on either side
of the 'gun and imparts transverse motion to the
The operation of the power feed mechanism
in conjunction with the conventional feed 40 slide IBB through lever arm 102 when the barrel
extension reciprocates.
Y
mechanism of the gun may be best understood
rIt has been found that the time of the impulse
by referring to Fig. 14. As the power feed slide
of the auxiliary feed mechanism acting on the
moves toward the axis ofthe gun, the power
feed pawl V83 introduces a loop or‘bight shown
heavy belt is so short as to give rise to a very
generally at B in the cartridge belt. This bight
produces slack between the holding pawlY I6 on
the gun and region of _the deflector 91 and the
large reactive force which may damage the belt
linkage. According to a modiiied form of the in
holding pawl 19 on the power’feed mechanism.
Deiiector 91 performs a special mission at this
vention the time of the impulse is lengthened by
provision of a resilient coupling, the time, of
course, remaining less than the reciprocal of the
'
time. "I'he deflector directs the adjacent sec 50 frequency of feed.
The Figures 19 to 24 show a modified form of
tion of the belt upwardly thereby assisting in
an auxiliary feed mechanism substantially as dis
the creation of the bight B. Since the power
closed above except for theV resilient coupling in
feed slide in its feeding movement is capable of
the line of thrust to the feeding pawl.
exerting an exceptionally 'strong force, this
Referring to Figure 20, there is represented a
force should not be applied as al direct thrust 55
against the stop mechanism in the feed passage
transverse section through an automatic gun
of the gun. Such a force vcould be transmitted
through a substantially flat section of the car
which is provided with a barrel I9 arranged to
tridge belt. Damage would result which would
block I l.. This barrel constitutes the main power
seriouslyrimpair the operation of the gun or put
it out of service. 'I'he presence of the flexible
source or the primary driving member of the gun.
A pair of side plates i2 are fastened to the trun
nion block by suitable means such as rivets (not
bight in the cartridge belt prevents any in
jurious pressure on the stop elements in the feed
passage and avoids the above mentioned dangers.
If the gun should happen to be operated from an
inverted position, gravity acting on the belt and
the flared mouth 95 on the sleeve 11 will facili
tate the formation of the bight B. During the
recoil interval, the conventional feed slide on
the` gun is moved to the'right as viewed in Fig.
14 to permit the gun feed pawl I5 to engage
behinda new cartridge which is to be fed into the
receiver of the gun. Holding pawl I6 prevents
any retrograde movement of the belt.
reciprocate within certain limits in a trunnion
sho-wn) . Positioned above the barrel are the con
ventional cartridge feed passage I3, the belt feed
slide I4, its associated belt feed pawl I5, and the
belt holding pawl E6. Resting against the right
hand side plate I2 of the gun is a substantially flat
base plate l1 which is secured to the gun by a
bolt and nut arrangement I8-I8'; (see also Fig
ures 19 and 21) . Bolt I8 passes through aligned
holes in the side plates and the depending legs
2t of the trunnion block I I so that the'reciproca
tion of the gun barrel will not be impeded. The
head of the bolt I3 is arranged to rest in a coun
On counterrecoil, the movement of the barrel 75 tersunk or recessed seat 2| in the body plate I1.
2,405,207
13
14
As shown in Figure 19 a pair of bores 22 are pro
and is retained in position by suitable means such
as a Cotter pin 5|. The connecting rod extends
alongside the side plate I2 of the gun and is cou
pled at its lower end >to the barrel extension 52
of the gun by a pin.
vided in the upper and lower edges adjacent the
left end of the base plate Il. One of these is ar
ranged to receive a dowel pin 23 which is carried
by the usual belt holding pawl pin 24 on the gun.
A hole 25 is provided in the dowel through which
the pin 24 is thrust. This pin and bore arrange
ment promotes a quick alignment of the base
plate on the side of the gun during the assem
bling operation.
The front face of the base plate il is provided
with a recessed guideway 26 which receives a re
ciprocating power feed slide 2?. The guideway 26
Cartridge guide 42, which comprises a substan
tially U-shaped member, is provided with a lug
that is centrally disposed on one end and has a
10
bore adapted to receive pin 4I thereby permit
ting pivotal mounting of the guide on the base
plate I1. The opposite end carries a pair of at
taching lugs which are arranged to span lug 43,
on the base plate l1. These lugs have aligned,
pin receiving bores. When the guide plate 42 is
is undercut on the side portions 28 (Fig. 21) to
produce a >pair of vertical flanges 2Q which con 15 swung closed as shown in Fig. 20 an expanding
" ñne the power feed slide 21 in the channel dur
pin 63 can be inserted in the bores so as to lock
ing its reciprocatory movement. Intermediate the
the members together. In this position the guide
top and bottom edges of the base plate and ad
42 and the base plate i7 define a passageway
jacent the left end thereof is a bore 3i! having a
substantially conforming to the shape of a car
recessed seat Si that is adapted to receive a, set 20 tridge. A pair of vertically extending ribs E4 and
screw 32 which acts as a pivot for a bell crank
55 on the base plate and the cartridge guide re
lever 33h. The threaded end 34 of the set screw
spectively serve as aligning means for the neck
is retained in a complementary threaded bore (not
end of cartridges. The cartridge guide is prefer
shown) inthe side plate I 2 of the gun. The other
ably flared at its top and bottom to facilitate in
gress and egress of a rapidly moving cartridge
side plate of the automatic weapon carries a, sim
ilarly disposed bore for a purpose which will be
belt. Midway between the top and bottom edges
of the cartridge guide are a pair of rectangular
explained hereinafter. The back face of the base
plate I1 is conditioned with a generally .triangular
holes {5S-56 Fig, 2o which are separated by a
shaped recess or cut-out portion 35 which per
web portion S1. A pair of spaced brackets 6B
mits an arm St of the bell crank 33 that is cou 30 are mounted adjacent the web portion and jour
nal a pin -69 which carries a spring pressed hold
pled to the power feed slide 21 to oscillate therein;
ing pawl "It, Coil spring '.'l is arranged to urge
(see Figs. 1i9, 20 and 21). Arm 3S has an elon
gated aperture 31 which receives a cylindrical
the cartridge engaging end 12 through the upper
of the pair of holes 6‘5-65. A cotter phi (not
stud 38 threaded into the rear of the power feed
slide 2l to effect a pivotal coupling between those 35 shown) prevents the pawl pin S9 from working
out of its bracket supports. The purpose of the
two members. Aperture 37 is oval in shape with
the major axis disposed substantially horizontally
lower hole et will be subsequently elucidated.
When it is desired to convert the gun to a left
to compensate for the arcuate movement of the
arm 3S when the power feed slide 2ï is recipro
hand feed, the pin G3 is driven out of its bore
cated vertically.
In this modified form a resilient coupling is
interposed between the bell crank lever 33 and
the power feed slide 2l to lessen the impact of
recoil transmitted to the feed slide during firing
of the gun. One form of resilient coupling is
shown in Figures 19 to 22 inclusive comprising a
40 in the lugs.
By swinging open the cartridge
guide d2 on its hinges, the bolt and nut fastener
ls--lä’ and the set screw 32 may be removed.
thereby permitting the base plate il to be de~tached from the side of the gun and from en
gagement with dowel pin 23.
The feed mechanism on the gun is then con
verted to a left-hand and dowel pin 23 is slipped
helical spring 38a mounted in a recess 37a formed
over the belt holding pawl pin 24 on the left side
in an angular extension 35o', of the bell crank lever
of the gun. Base plate Il is then secured to the
arm 35. A screw threaded plug 33h is inserted in
the outer end of the bore 31a to act as a seat for 50 gun by inverting it and slipping bolt I8 through
from left to right and tightening nut IB’. This is
spring 38a and to provide means for adjusting the
possible since the plate is symmetrical about a
tension of the spring 38a.
horizontal line through the bore for bolt I8 and
The right-hand end of the base plate is pro
also because of the second bore 22 in one edge of
vided with a pair of spaced lugs 39 which have
aligned bores ¿30. These act as hinge elements 55 the plate. Pin 52 is removed thereby disconnect
ing the connecting rod 49 from bell crank lever
and receive a pin 4I which is arranged to secure
33. The connecting rod is turned over and
a cartridge guide 42 thereto in the manner illus
coupled to the bell crank by pin 59. The op
trated in Fig. 20. ri‘he left end of the base plate
posite end of the connecting rod is then secured
I1 has a single lug 43 with a vertically disposed
hole 44 and constitutes one of the lock elements 60 to the left side of the barrel as disclosed herein
before. The bell crank is secured to the 'case
for the cartridge guide 42 as will be explained
plate by pivot pin 32 and the power feed slide
in more detail later.
21 is inverted in its guideway and coupled to the
Power feed slide 21 is a substantially U-shaped
member as represented in Figs. 2G and 21 and is
bell crank.
adapted to reciprocate in its guide channel 26.
Parallel side walls 45 journal a pawl pin 45 which
cartridge guide is up-side-down, it must be in
carries a power feed pawl 4l in pivotal engage
ment thereon. A spring ¿i8 is coiled about a
portion of the shaft to yieldingly urge the pawl
Since the holding pawl 'Nl on the
verted so as to project through the other oi' the
two holes S6. This is accomplished by removing
pin 5S from the brackets 65.! and rev- sing le
pawl. Pins E3 and al are preferably ini rted in
outwardly in a cartridge engaging relationship 70 the ends of the cartridge guide aîthough this is
as is shown more clearly in Fig. 20.
The upper arm of the bell crank lever 33 is
conditioned with a countersunk aperture 33’ and
is secured to a connecting rod dil by a flat headed
not absolutely necessary. The gun is now condi
tioned for a left-hand feed. It will be observed
pivot pin 50 which passes through the aperture
The operation of the power feed mechanism
that this transposition is effected by the use of
but a few simple tools.
15
2,495,207
(set for right hand feed) in conjunction with
the gun is as follows.
First a cartridge belt is
16
is pivotally mounted on a vertically disposed pin
89 which is journalled in the bracket structure
14 at one side thereof. An enlarged head 99 re
threaded through the power feed mechanism into
tains the upper end of the pin in the bracket
the standard feed mechanism and in the general
manner shown in Fig. 20.` When the gun is fired Ul .while the lower end carries an expanding pin 9i
in a suitable transverse bore thereby locking this
the barrel I9 and the barrel Vextension 52 recoil
assembly in position. The other arm 92 of the
-in the fixed trunnion block H. This backward
bell crank 81 extends toward the side of the gun
movement (to the left in Fig. 19) of the barrel
and has a rounded end 93 which is arranged to
extension acting through the connecting rod 49
ñt in a notch or recess 94 in the barrel extension
rocks the bell crank 33 about its pivot pin 32.
52 of the gun.
This lifts arm 36 of the bell crank and elevates
The sleeve 11 is flared at its ends 95 and 96 to
the power feed slide 21 and its associated feed
promote the ingress and egress of the cartridge
pawl 41 in the guide channel 2B.
belt. The bracket 14 is provided with an arcuate
’ The end 39a, of the bell crank moves at the
hump or deflector 91 adjacent the flared mouth
same speed as the recoil of the barrel extension
95 of the sleeve for a purpose which will be sub
and associated parts and therefore the resilient
coupling, above described, is connected between
the bell crank and the power feed slide 21 to pre
vent damage to the belt linkage.
Power feed pawl 41 engages behind a cartridge
in the cartridge guide and carries the belt up
sequently mentioned.
The hump is disposed
transversely of the bracket and substantially
parallel to the axis of an approaching cartridge.
-Secured to the bracket 14 is an upwardly bent
leaf spring 99 which lies substantially in the path
of a cartridge belt which is to be fed into the con
wardly. Holding pawl 1E! ratchets over the on
ventional feed passage I3 of the gun.
coming cartridge. The movement of the power
This power feed mechanism requires but a few
feed slide is sufficient to lift a new cartridge above
simple modifications in a standard machine gun
the holding pawl and to provide a loop or bight in
to permit its attachment thereto. Four holes 99
the’ cartridge belt as shown in phantom and des
are drilled and threaded in the side plate I2 of
ignated as A in Fig. 20. The creation of this
the gun to receive the four set screws 16 which
bight constitutes an important feature of the in
hold the bracket 14 on the gun. An elongated
vention as has been fully described in the oper
ation of the ñrst form of this invention.
30 slot 199 is cut in the side plate I2, and in back
of the slot the recess 94 is cut in the barrel eX
It is often desirable to feed a cartridge belt
tension 52 to receive the rounded end 93 of the
from a location substantially on the same level as
arm 92 of the bell crank. These five compara
the conventional feed mechanism of the Brown
tively simplemachining operations are all that
ing automatic rifle. Figs. 23 and 24 illustrate a
power feed mechanism which is adapted to ad 35 are required -to condition the standard gun to re
ceive the side feeding power feed mechanism.
vance a belt from such a location to the standard
The operation of this auxiliary feed mechanism
gun feed mechanism. The device includes a sub
stantially right-angular bracket structure 14
. is as follows:
When the gun is ñred the barrel I9 and the
which has one of its flanges 15 secured to the
side plate l2 of the gun by four set screws 16, 40 barrel extension 52 recoil in the ñxed trunnion
block.Y Bell crank 81 is effectively coupled to the
The outer end of the bracket has a horizontal
barrel extension and moves therewith since its
sleeve 11 which provides a-feed passage 13 which
Vend 93 is lodged in recess 94. Hence recoil of the
is aligned with the feed passage IS‘in the gun.
gun barrel rocks the bell crank thereby permit
The top face of the sleeve 11 has pivotally mount
ed thereon and partially projecting through an 45 ting the arm coupled to the power feed slide 82
to move the slide in its guideway in bracket 14
aperture therein a holding pawl 19 which is nor
toward the axis of the gun barrel. In so doing
mally sustained in a cartridge engaging position
the power feed pawl 83 on the slide engages be
by a spring 89. The lower inner surface 8l of
hind a cartridge in the belt advances the entire
the sleeve 11 acts as a shelf and slidably retains a
belt a distance equal to the pitch distance be
power 'feed slide 82 which is adapted to recipro
tween links. The holding pawl 19 ratchets over a
cate thereon. The power feed slide carries a
cartridge which is being advanced and then drops
behind it to prevent backward movement of the
pawl 83 which projects through a narrow elon
belt.
gated hole 84 in bracket 14 and advances the
The operation ofthe power feed mechanism in
cartridge belt when the slide is reciprocated. The 55
conjunction with the conventional feed mecha
inner end of this slide is provided with a sleeve
nism of the gun may be best understood-by re
85 with a bearing surface having the general
ferring to Fig. 24. As the power feed slide moves
shape of an elliptical cylinder. This journal is
toward the axis of the gun, the power feed pawl
adapted to receive the cylindrical end 86 of a
bell crank lever 81.
60 83 introduces a loop or bight shown generally at
B in the cartridge belt. This bight produces
In this modified form of the invention cush
slack between the holding pawl I6 on the gun
ioned power feeding means between the recoil
and region of the defiector 91 and the holding
mechanism and the cartridge belt is built into
pawl 19 on the power feed mechanism. Deilector
the power feed slide 82. The slide 32 is formed
91 performs a special mission at this time. The
of two overlapping sections 82a and 82h having
deflector directs the adjacent section of the» belt
angular ends 82e and 82d respectively, bent in
upwardly thereby assisting in the creation of the
opposite directions so that the overlapped por
bight B. Since the power feed slide in its feed
tions provide a recess 82e for housing any num
ing movement is capable of exerting an excep
ber of helical springs 82]c required to provide the
tionally strong force, this force should not be
proper cushioning of the thrust of the bell crank
applied as a, direct thrust against the stop mech
lever while said thrust is being transmitted to
anism in the feed passage of the gun. Such a
the power feed pawl 83. On counterrecoil this
force could «be transmitted through a substan
structure does not interfere with the return of the
tially flat section of the cartridge belt. Damage
power feed pawl 83 to engage the next cartridge.
would result which would seriously impair the
A lever 81 is provided with a hollow hub 88 which
spring pressed, pivotally mounted power feed
2,405,207
operation of the gun or put it out of service. The
presence of the iiexible bight in the cartridge
'belt prevents any injurious pressure on the stop
elements in the feed passage and avoids the above
mentioned dangers. The presence of a resilient
18
iary belt feed comprising a member fixed with re
lation to the gun frame and having a guideway,
a feed slide reciprocable in the guideway, a car
tridge belt guide on said fixed member, a car
tridge feed pawl carried by the feed slide and
or cushioning element in power feed slide pre
extending into said cartridge belt guide, a second
vents a violent thrust on the feed pawl 83 and
cartridge belt holding pawl in said guide, a lever
consequently on the cartridge belt, or otherwise
pivoted to said fixed member and having an arm
stated, it lengthens the time of impact. If the
connected with the said slide, and resilient means
gun should happen to be operated from an in 10 interposed between said arm and feed slide to
verted position, gravity acting on the belt and
lessen the impact on said slide and said pawl
the flared mouth, 95 on the sleeve 1'! will facili
during the cartridge feeding operation, the lever
tate the formation of the bight B.
also having an arm attached to the gun barrel
.During the recoil interval, the conventional
extension and so constructed and arranged to
feed slide on the gun is moved to the right as 15 move the slide to feed the belt upon recoil of the
viewed in Fig. 24 to permit the gun feed pawl I5
gun barrel`
to engage behind a new cartridge which is to be
3. The invention of claim 1 characterized in
fed into the receiver of the gun. Holding pawl
that the lever is a bell crank having a hollow
I6 prevents any retrograde movement of the belt.
extension, an adjustable plug closing the end of
While a bell crank arrangement has been de 20 the extension, said connecting means comprising
scribed as the means for coupling the barrel ex
a pivot pin fixed to said slide and ex ending into
tension to the power feed slide for actuating the
said hollow extension, said resilient means com
slide, other mechanical organizations are feasible
prising a spring in the hollow extension extend
and will suggest themselves to one skilled in the
ing between the pivot pin and the plug, the plug
art.
25 providing means for varying the compression of
the spring.
While the invention has been represented and
described in connection with the recoiling barrel
4. In combination with a machine gun having
and barrel extension of a Browning machine gun,
a frame including a feed passage arranged trans
it is to be understood that it is capable of a simi
versely of the gun, a barrel, a barrel extension
lar association with the gas piston of a gas op 30 and a bolt reciprocable in the frame during gun
erated gun, The gas piston constitutes the direct
ñring, a main feeding device coupled to the bolt
power source and imparts ample force to the
and reciprocable in the top portion of the frame
power feed mechanism to lift the heavy belt to
transversely of the axis of the gun, said mein
the ñnal feeding stage for the conventional feed
feeding device arranged to feed the ñrst few
to engage it for operation under no burden.
35 cartridges in the leading end of a belt on counter
' I claim:
.
recoil, and a holding pawl on the frame for the
1. In combination with a machine gun having
leading end of the belt for preventing retrograde
a frame including a feed passage, a barrel, a bar
movement thereof; the improvement comprising
rel extension and a bolt reciprocable in the frame
a bracket secured to a side of the frame, a guide
during gun firing, a main belt feeding device cou 40 means on said bracket and forming a belt passage
pled to the bolt and reciprocable in the top por
aligned with the feed passage in the gun frame
tion of the frame transversely of the axis of the
and spaced therefrom, a second belt feeding de
gun, said main feeding device constructed and
vice reciprocably mounted in the guide means, a
arranged tc feed the first cartridges in the lead
bell crank pivotally mounted on the bracket and
ing end of a belt on counterrecoil, a holding pawl
coupled at one end to the barrel extension, a
in the frame for the leading end o-f the belt for
shock absorbing element coupling said bell crank
preventing retrograde movement thereof; the im
provement consisting of an auxiliary belt feed
to the second belt feeding device, said bell crank
constructed and arranged to operate said second
comprising a member fixed with relation to the
feeding device to advance the belt on recoil of
gun frame and having a guideway, a feed slide 50 the barrel extension, a second holding pawl on
reciprocable in the guideway, a cartridge belt
said guide means projecting into the belt pas
sage, a cartridge deflecting rib in said belt pas
guide on said fixed member, a cartridge belt feed
sage between said main feeding device and said
pawl carried by the feed slide and extending into
said cartridge belt guide, a seco-nd holding pawl
second feeding device for deflecting the cartridge
in said guide, a lever pivotally attached to a fixed 55 of the belt out of the line of belt feed, and a
leaf spring secured to said belt passage between
part of the gun frame, means pivotally connect
the deflecting rib and the main feeding device to
ing said lever to the said slide, operative connec
cushion the deflected cartridges during the feed
tions between said lever and said .barrel extension
ing of the belt by said main feeding device upon
constructed and arranged to operate the feed
slide upon the recoil of the barrel extension, and 60 counterrecoil.
5. In combination with a machine gun having
resilient means interposed between said lever and
a frame including a feed passage arranged trans
the feed slide to lessen the impact of recoil on
said slide upon the firing of the gun.
versely of the gun, a barrel, a barrel extension
and a bolt reciprocable in the frame during gun
2. In combination with a machine gun having
a frame including a feed passage, a barrel, a bar 65 ñring, a Imain feeding device coupled to the bolt
and reciprocable in the top portion of the frame
rel extension and a bolt reciprocable in the frame
during gun firing, a main belt feeding device
transversely of the axis of the gun, said main
feeding device arranged to feed the first few
coupled to the bolt and reciprocable in the top
portion of the frame transversely of the axis of
cartridges in the leading end of a belt on coun
the gun, said main feeding device constructed 70 terrecoil, and a holding pawl on the frame for
and arranged to feed the first few cartridges in
the leading end of the belt for preventing retro
the leading end of a belt on counterrecoil, and a
grade movement thereof; the improvement com
holding pawl on the frame for the leading end
prising a bracket secured to a side of the frame,
of the belt for preventing retrograde movement
a guide means on said bracket and forming a
thereof; the improvement consisting of an auxil 75 belt passage aligned with the feed passage in the
22,405,207
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'i9
gun frame and spaced therefrom, aseccnd >belt
feeding device reciprccably> mountedin the‘guide
means, a bell crank vpivotally mounted ¿on vthe
_ bracket and coupled at _one end to the barrel
>thefeed slide‘to lift> the Weight-ofîthefbeltbelow
said feed pawl upon recoill of thevbarrel,` saidfeed
pawland holding pawl of the auxiliary feed be
ing so coordinated with the feeding pawl of the
‘main feeding device as'to occasion a slack inithe
extension, a shock absorbing element >coupling
»belt between the holding pawl of the auxiliary
said bell crank to the second belt feeding device,
feed and the feeding pawl of the» main feeding
a bell crank constructed and arrangedgto loperate
said second feeding device `to advance the belt
'7. In'combination with a; machinergunhaving
on recoil of the barrel extension, a second holding
pawl onsaid guide means projecting into the belt 10 a frame comprising two side-plates having a pair ~
of oppositely disposed elongated »guide ‘slots
passage, a cartridge deflecting rib-in said belt
~ therein and a main feed mechanism operable upon
passage between said main feeding 'device and
counterrecoil of ‘ the gun, --the >irnproven'ient com
said second feeding device and spaced from the
prising'an auxiliary feed comprising abase plate
holding pawl on the frame for de?lecting the
device.
‘
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'
cartridges of the belt out ofthe line of'beltgfeed,
rigidly disposedon one'of said side plates and
and a leaf spring secured to said belt passage
having a feed slider guîdeway therein, a pin
between the deñecting rib and the main“ feeding
device to cushion the deñected cartridges during
the feeding of the belt by said main feeding
rigidly -connecting said base plate to the ysaid
frame and passing through both of said side
plates, aj-feed slider reciprocable in saidguide
way and having a feed pawl Vpivoted thereto, a
device upon counterrecoil.
Y
6. In combination with a machine gun having
a frame including a feed passage, a lbarrel and
bell crank pivotally mounted on one of the side
'plates and coupled at one of its ends to the feed I , ‘
fsliden a connecting rod pivotally connected to
barrel extension and a bolt reciprocable Ain, the
lvthe-otherend of said lever, said rod having a- pin
frame during gun firing, Va main belt feeding
device coupled to the bolt and reciprocable in the 25 extending transversely of the gun frame and
attached to the barrel extension whereby the
top portion of the frame transversely >of ythe »axis
slider isoperated tovoperate the Yfeed slider upon
of the gun, said main feeding device constructed
the recoil of the barrel, theend portions of'said
and arranged to feed the ñrst ‘few cartridges in
pins being adaptedl to ride in the said slots in
the leading end of a belt ori-counterrecoil, and a
holding pawl on the frameforfthe leading end of 30 the side plates, a cartridge guide mounted on the
the belt for preventing retrograde moven'ient>
base platej, -said plate vand cartridge guide form#
thereof; the improvement consisting-of an auxm
iliary belt feed comprising a base plate secured
to the gun frame and provided with a feed slider
guideway, a feed slider -reciprooable in lsaid guide»
way, a -feed pawl _pivoted in ysaid slider,`- a 4belt
guide opposite the feed slider guide and Vhaving a
ing a belt-,confining passage therebetween, a belt
holding pawl pivoted therein above said feed pawl,
a two-arm lever pivotally mounted adjacent one
holding pawl on the cartridge >guide and extend
ing ínto-saidpassage and adapted tri-support the
weight’of the belt below saidlpawlysaidfeed and
holding pawls of the auxiliary feed beingso co- Y
ordinated with the feeding pawl of the main feed
mechanism as to occasion a »slack in the belt
between the holding pawl ofthe auxiliaryfmech
of the plates of thegun frame and having one 4,0 anisin and the -belt feeding device of the main
arm connected‘with the feed slide and the other
with‘the barrel for operating said lever to operate
feed mechanism.
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SAMUEL vCT. l GrRlîìEN`
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