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Патент USA US3039371

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June 19, 1962
l. R. BARR
3,039,364
BARREL-FEED MECHANISM
Filed May 3, 1960
2 Sheets-Sheet 1
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IRWIN R BARR
HSFIG. 4
BY mSJ-W
ATTORNEY
June 19, 1962
|. R. BARR
3,039,364
BARREL-FEED MECHANISM
Filed May 3. 1960
2 Sheets-Sheet 2
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INVENTOR.
IRWIN R. BARR
BY
0444a,»
ATTORNEY
United States Patent Office
1
3,39,354
Patented June 19, 1962
2
ment ?ips the extracted cartridge out of the receiver. Only
3,039,364
_
BARREL-FEED NECHANISM
Irwin R. Barr, Baltimore County, Md, assignor to Air
craft Armaments, lnc., Cockeysville, Md., a corporation
of Maryland
Filed May 3, 1960, Ser. No. 26,568
5 Claims. (Cl. 89—33)
a small amount of enery is extracted from the recoiling
bolt in this ‘manner so that there is no signi?cant decrease
in the ?ring rate of the gun.
The more important features of this invention have thus
been outlined rather broadly in order that the detailed de
scription thereof that follows may be better understood,
and in order that the contribution to the art may be better
This invention relates to machine ‘guns of the type ?ring
appreciated. There are, of course, additional features of
cartridges that are linked together in belt form, and more IO the invention that will be vdescribed hereinafter and which
will also form the subject of the claims appended hereto.
particularly, to a feed mechanism for indexing cartridges
into a position where they can be stripped from the belt
Those skilled in the art will appreciate that the concep
and inserted in the gun chamber and ?red, and an ejector
tion upon which this disclosure is based may readily be
mechanism for ejecting cartridges from the gun after they
utilized as a basis ‘for designing other structures for carry
15 ing out the several purposes of this invention. It is im
are extracted from the chamber.
Ammunition for guns of the class described is in the
portant, therefore, that the claims to be granted herein
form of long belts of cartridges linked together. In oper
ating such guns, it is necessary to index the belt each time
the gun is ?red so as to place a new cartridge in a position
shall be of su?icient breadth to prevent the appropriation
of this invention by those skilled in the art.
.
In the drawing:
FIGURE 1 is a sectional view of a machine gun into
where it can be stripped from the belt and inserted into
which the invention has been incorporated.
the gun chamber. In guns of the class described, recoil
FIGURE 2 is a top view of the gun shown in FIGURE
movement of the bolt is usually employed to operate a
1 with the top part of the receiver removed to facilitate
‘feed mechanism which indexes the belt each time the gun
showing the invention.
is ?red. The necessity for utilizing the energy of the re
coiling bolt to move a long, heavy, belt of ‘ammunition 25 FIGURE 3 is ‘similar to FIGURE 2 but shows the vari
ous positions of the gun elements after the bolt has re
creates a problem when it is desired to obtain a very rapid
coiled and the barrel extension is returning to battery posi
rate of ?re from the gun. Because the rate at which the
tion.
bolt recoils determines the time interval between ?rings,
FIGURE -4 is a sectional view taken ‘along the line
it is obvious that any factor which causes a large portion
30
4-44 of FIGURE 2.
of the recoiling energy of the bolt to be used for a purpose
FIGURE 5 is a side view of the feeder-ejector mecha
other than'accelerating the recoil of the bolt will decrease
nism which ‘forms the basis of this invention.
'
the rate of ?re. In other words, with high belt loads aris
FIGURE 6 is a top view of the mechanism shown in
ing from long belts that are twisted, the bolts of guns of
FIGURE 5 with various parts removed to facilitate an
the class described are slowed considerably during recoil
'
thereby seriously affecting the rate of ?re of such guns. 35 understanding of the construction.
FIGURE 7 is a sectional lview of the mechanism.
One solution to this problem is to employ auxiliary am
Referring now to FIGURE 1, reference numeral 10
munition “boosters” which are electric motors that feed
designates generally a machine gun having a hollow re
the belted ammunition into the gun thereby reducing the
ceiver 11 with ‘a forward portion 12, an intermediate por
belt loads required to be handled by the recoiling bolt.
tion 13, and a rearward portion 14. Portion 12 has cylin
The de?ciency of this approach is in the complexity of
equipment ancillary to the gun itself and the power re- \
quired to run such equipment.
.
,It is therefore a primary object of this invention to pro
vide, for a machine gun of the class described, a feed mech
drical bearing ring 15 into which the bearing '16 of barrel
17 is slideably mounted to effect barrel movement between
battery and recoil positions. Each side of portion 13 of
receiver 11 is provided with longitudinally extending guide
anism which achieves positive belt indexing without using 45 rails 18 which support barrel extension 19 ‘and permit the
same to reciprocate in the receiver. Barrel extension '19
any of the recoil energy of the bolt and without requiring ‘
has a forward end which interlocks with the'breech por
_
tion of barrel 17 adjacent chamber 20 to de?ne a barrel as‘
As a feature of this invention whereby the primary ob
sembly. Barrel extension ‘15! also has rearwardly extend
ject is achieved, energy to pivot a feed arm connecting
ing legs 21 which have longitudinal grooves therein riding
with an indexing mechanism is extracted from the recoil
50
ing barrel. Werethe recoiling barrel to operate directly ‘on rails 18. ‘In this manner, the barrel assembly compris
upon the feed arm, the sudden impulse applied thereto i '1 ing barrel 17 and barrel extension 19 moves in receiver 11
‘as a unit supported by rails ‘18 and bearing ring 15.
.would be’ transmitted to the belt in such a manner that‘ the
The rearmost portion of each leg 21 is axially bored as
inertia of the latter would cause the links of the belt to
auxiliary ammunition boosters.
fail. This is prevented by interposing resilient means be 55 shown in FIGURE 4 for the reception of barrel extension
buffer 2.2 containing a compression spring. Buffer 22
abuts end plate 23 on portion '14 of the receiver such that
initial shock of the recoiling barrel is absorbed ‘and applied
the barrel assembly is constantly urged toward battery
more gradually to the feed ‘arm. To facilitate hand charg
tween the recoiling barrel and the feed arm such that the
position as shown in FIGURE 1.
ingyof .the, gun, the feed arm is mounted on the receiver
so that to index the belt, the arm is pivoted _from_a posi 60 Accelerator 24 is U-shaped. The legs are pivotally
tion in the path traversed by the bolt during its recoil to a
mounted on the receiver and straddle barrel '17. Connec
tor portion 25 is beneath the barrel and is urged into en
position outof such path. The geometry of therconstruc
gagement with the rear-face of bearing 16 by_ a spring
tion provides for barrel recoil to pivot the feed armrout
.of the path ‘of the recoiling bolt before its contact there
(not shown).
7
V
'
with.. However, with this construction, the bolt can be 65 Slideably mounted on barrel extension "19 is bolt as
manually ‘moved to recoil positionwithout ‘disturbing the
sembly ‘26 whichvincludesbolt block 27 and bolt slide 28.
barrel when the latter is in battery position, and the bolt
Bolt slide 28 has a plate-like portion 29 which is slideably
engaged in {grooves 35} formed in the inner faces v3‘1 of
legs 21. Integrally beneath the portion 219 is buffer cylin
movement can then actuate the feed arm to, indexv the am
munition belt. preparatory to ?ring the gun. Ejection of
der 32 having a bore 33 which is engageable over buffer
a cartridge extracted by the bolt from the chamber is ac
complished by using the recoiling bolt to pivot a lever into 70 spring 34 which itself is mounted at the rear of receiver 1.
Cylinder 32 has an aperture in the center thereof through
engagement with the extracted cartridge. Such engage
3,039,364
3
which shaft 35 passes.
Barrel return spring 36 mounted
on shaft 35 has one end bearing on the rear of receiver 11
4
Recoil of the bolt assembly on the barrel extension is
halted by buffer spring 34 acting on cylinder 32. Just
prior to buffering, the cartridge extracted by extractors 52
and 54 is ejected from the receiver. After bu?ering,
and the other end bearing on cylinder 32 as shown in FIG
URE 1. The rear portion 37 of bolt slide 28 projects up
wardly between faces 31 and has ?ring pin 33 rigidly at
tached thereto facing toward the forward end of the re‘
barrel return spring 36 drives the bolt assembly forward
on its counter-recoil stroke. The sequence of stripping a
projects beyond face 50 contacting the primer in the
with the next link preparatory to moving the same over
cartridge from the belt, chambering the stripped cartridge,
ceiver. Through the center of portion 37 is axial slot 39.
?ring and extracting the cartridge is again repeated until
Bolt block 27 has a rearward guide portion 40 slideably
sear 55 is pivoted into engagement with rear portion 37
engaged in slot 39. To limit relative movement between
block 27 and slide 2%, portion 46‘ is slotted as at 41 and pin 10 of the bolt assembly. When this occurs upon the release
of trigger 56, the bolt assembly is prevented from ?nish
42 passing through slot 41 is rigidly connected to rear
ing its counter-recoil stroke.
portion 37 of slide ‘28. Block 27 has a forward face 54)
Apertured ears 57 project from each side of portion 13
which ?ts ?ush against a cartridge base. Aperture 43 in
of receiver 11 and surround ammunition slits 518. For
face 50 permits ?ring pin 38 to project beyond face 50
when the bolt ‘assembly is positioned on the barrel assem 15 right-handed feed, ammunition tray 47 is attached to the
pair of ears above slit 518 on the left side of the receiver.
bly at the forward most position of the bolt assembly
A feeder ejector mechanism 60 is attached to the four
adjacent chamber 20. Pivotally attached to bolt block 27
ears on the right side of the receiver. Above tray 47
are bolt locks 44 which are engageable with faces 31 of
is mounted ratchet feed mechanism 61, which includes
legs 21 when the bolt assembly is at any position on the
barrel assembly remote from the chamber (see FIGURE 20 slider 62 mounted in tracks 63 on receiver 11 so as to
be movable in a direction parallel to the direction in
3). As barrel return spring 36 drives bolt assembly 26
which the linked ammunition is fed into the receiver. Fac
from its position remote from chamber 20' toward the
ing links 48, slider 62 has lugs rigidly supporting pivot pin
chamber, pin 41 is at the rear of slot 41 and ?ring pin
64 upon which ratchet arm 65 is pivotal. Ratchet arm
38 is internal to aperture 43 and does not project beyond
face 50. Locks 44 bear against faces 31 and preclude 25 spring 66 resiliently urges the free end of arm 65 away
from the slider as shown in FIGURE 4. The free
relative movement between bolt slide 28 and bolt block
end of arm 65 has cam edge 67 which is engageable with
27 during travel of the bolt assembly toward the chamber.
links 48. Spring housing 68 is detachably connected to
Stripper 45 projects above block 27 and during such travel
tracks '63, and for right-handed feed is positioned at the
passes through slot 46 in ammunition tray 4-7 which is
extreme left of tracks 63. Housing 68 is centrally aper
above and behind chamber 20. Links 43‘ are slideable
tured at 69 to receive ratchet spring 701 having one end
on tray 47 in a direction normal to the direction of bolt
bearing on ‘housing 68 ?xed to the receiver and the other
travel. During the counter-recoil stroke of the bolt as
end bearing on slider 62 for constantly urging the slider
sembly, stripper 45 engages the base of a cartridge held
away from the housing. When slider 62 is furthest from
by link 48 and strips the cartridge from the link. Cham
bering ramp 49 cams the nose of the cartridge downwardly 35 housing 68, ratchet arm 65 is positioned so that cam
edge 67 is engaged with a link von the cartridge belt that
into chamber 20 as the bolt assembly moves toward the
is adjacent opening 46. Movement of slider 62 toward
chamber. Eventually surface 50 engages the base of the
housing 68 causes edge 67 to move the link into alignment
cartridge and rams the same into the chamber, where
with opening 46. Further movement of slider 62 away
upon movement of block 27' halts. However, movement
of slide 28 continues as rear portion 37 cams locks 44 40 from housing 68‘ results in the next link in the belt
camming arm 65 toward slider 62 ‘against the action of
into keepers 51 formed in the sides of barrel extension
spring 66 until the slider is furthest from the housing.
19. Simultaneously with pivotal movement of the locks
At this point, spring 66 moves edge 67 into engagement
into keepers 5'1, ?ring pin 38 slides in aperture 43 and
Thus, movement of the bolt as 45 slot 46. ‘In this manner, oscillatory movement of slider
62 causes indexing ‘of the belt.
sembly to its forwardmost position simultaneously locks
The actuation of slider 62 in a manner timed to ?ring
the bolt assembly to the barrel extension and fires the
of the gun is achieved by feeder-ejector mechanism 60,
cartridge in the chamber. FIGURE 1 shows the position
which includes barrel feed support 71, housing assembly
of the various parts at the instant the gun is ?red.
Upon ?ring of the cartridge, the barrel assembly and 50 72 slideably mounted on support 71, feed arm 73 and
ejector arm 74. Barrel feed support 71 has a body 71'
bolt assembly begin to recoil together. Recoil movement
that is generally square in cross-section and elongated.
of bearing 16 causes accelerator 24 to pivot, but the
Apertured connected ears 75 are provided at the remote
geometry of the accelerator is such that connector 25
ends of body 71' for mating with ears 57 on the receiver.
moves at the same linear velocity ‘as the bolt assem
Projections 76 extend away from body 71' and bear
bly during initial recoil movement. This permits the gas 55
against the sides of receiver 11 when removable connectors
pressure in the barrel to decrease before the bolt assem
78’ are inserted in the mating apertures of cars 57 and
bly is unlocked from the barrel extension. As the recoil
75. In this manner, support 71 is securely ?xed to the
movement of the barrel assembly continues, accelerator
receiver.
24 pivots further causing bolt slide 28 to move relative to
Body 71’ is provided with upper and lower longitudi
the barrel extension. Such relative movement causes 60
nally extending apertures 77 in which removable rod 78
pin 4-2 to slide in slot 41 and locks 44 are oammed out
can be inserted. A pair of transverse slots 79 are formed
of keepers 51. Further recoil of the barrel assembly
in the upper and lower surfaces of body 71'. A single
causes accelerator 24 to accelerate the bolt assembly
blind hole 80 is provided in body 71' opening into the
toward its position shown in FIGURE 3. Recoil of the
barrel assembly is halted by buffer 212 whose spring returns 65 upper slots 79 and a single blind hole 80' is provided in
body 71' opening into the lower slots 79. Holes 80 and
the barrel assembly to battery position while the bolt as
80' are adjacent. Link-engaging ?ngers 81 are pivotally
sembly is still recoiling on the barrel extension.
mounted in upper slots 79 on rod 78. The free end of
Bottom extractor 52 is pivotally mounted on bolt block
each ?nger is biased away from body 71' by a spring 82
27 and by means of cam groove 53 is caused to be en
gaged with the rim of a cartridge as the latter is cham 70 which is inserted in blind hole 80.
The forward portion of body 71' contains centrally lo
bered. Side extractor 54- is also engaged with the rim
cated dovetail groove 81’ which extends longitudinally.
during chambering. In this manner, extractors 52 and 54
The rearward portion of body 71’ has a triangular recess
operate on the rim of a cartridge to extract the same. from
82 therein with an aperture 83 at an apex of recess 82.
the chamber during recoil movement of the bolt assem~
Projecting beyond body 71’ is apertured boss 84. The
bly on the barrel extension.
base of the cartridge.
3,039,364
6
rear end of body 71' is recessed at 85. With this con
pivotal movement of arm 74 causes web 104 to strike
struction, support 71 can be attached to either the right
side of the receiver for right-hand feed or to the left
side of the receiver for left-hand feed. Removal of rod
side extractor 54. The sharpness of this blow causes the
extracted cartridge to pivot about the side extractor.
78 from one aperture 77 and insertion into the other aper
The momentum of the extracted cartridge then causes the
the cartridge extracted by the bolt assembly forward of
ture 77 permits ?ngers 811 to properly engage the links in
same to be ?ipped through opening 57 in the receiver.
the cartridge belt when the latter is fed from either side
FIGURE 3 illustrates the relative positions or" the various
of the receiver. Thus, while a right-hand feed is shown
elements as the bolt assembly is buffered and just before
in the drawing, the disclosed construction permits the gun
the barrel assembly returns to battery position.
to be changed to left-hand feed merely by rotating body 10 As above described, the pivotal movement of feed arm
71' through 180° and attaching the same to the left side
73 causes slider 62 to index the belted ammunition and
place a new round above slot 46 in the ammunition tray.
of the receiver.
Housing assembly 72 includes elongated housing 86
FIGURE 4 shows the position of the slider corresponding
having rib 87 along one edge that is slideably engaged in
to the position of the feed arm shown in FIGURE 3. As
dovetail groove 81 on body 71’. Housing 86 has a cy 15 the bolt driving spring moves the bolt assembly through
lindrical bore 88 therein extending rearwardly from a
its counter-recoil stroke and stripper 45 strips a new
closed end adjacent the forward end of body 71’. Slide
round from the links held in the ammunition tray, spring
able in the open end of housing 86 is plunger 89. Pin
70 assisted by spring 97 returns arm 73 to its normal
90 is rigidly attached to plunger 89 and is slideable in
position in the path of the bolt assembly as ratchet 65 is
slots 91 formed in housing 86 to limit relative movement 20 returned to its position ready to again index the belt.
of plunger 89 in the housing. Plunger 89 is urged to
Spring 108 also returns ejector arm 74 to its normal po
ward the open end of housing 86 by spring 92 which
sition so that after the stripped round is ?red, the above
bears against the closed end of the housing and against
described sequence of events will again occur. ‘Spring 92.
a shoulder 93 on plunger 89. Plunger 89 also has head
also returns housing 86 to its normal position abutting
94 which projects beyond the open end of housing 86.
portion 110 on the barrel extension. Fingers 81 prevent
Feed arm 73 is a bell-crank having one end pivotally
mounted on pin 95 in recess 82. Cam face 96 is caused
overrunning of the belt during indexing.
to abut plunger head 94 by the action of spring 97. The
along the path traversed by the bolt assembly when the
The lower portion of receiver 11 is slotted as at 115
latter recoils. Such slots provide clearance for a pin
free end of arm 73 contains cam slot 98. Adjacent slot
93 'is cam portion 99. As shown in FIGURE 1, slot 93 30 that can be rigidly connected to either side of cylinder
32 of the bolt assembly. A plunger 116 is slideably
is engaged by the free end 100 of actuator crank 101.
mounted in a tube 117 laterally of slot 115. Plunger
Crank 101 is pivotally attached to the top of receiver 11
116 is urged to a position forward of the pin in cylinder
by pin 102. On the end of crank 101, opposite to end
32 so that there is no contact with plunger 116 while the
100, is a lever arm 103 engaged in notch 104 in slider 62.
Ejector arm 74 is bifurcated and has forward web 104 35 gun is ?ring and the bolt assembly is moving. In the
and rearward web 105 interconnecting arms 106. Arm
event that a round fails to ?re, the gun can be hand
charged by manually pulling plunger 116 rearwardly.
74 is pivotally connected to body 71’ by pin 107 attached
Rearward movement of plunger 116 imparts rearward
movement to the bolt assembly through the pin in cylin
seen in FIGURE 6. In normal position, web 104 acting 40 der 32. Since the barrel assembly remains stationary
during hand charging, the bolt assembly contacts cam
on housing 86 retains arm 74 just out of the path of
portion 99 on arm 73 causing the latter to pivot and
movement of the bolt assembly when the latter recoils
index the belt. The bolt assembly also contacts projec
on the barrel extension. The rear portion of arms 106
tion 109 and causes arm 74 to pivot thereby ejecting the
project outwardly at 109 into the path of movement of
45 defective round. If trigger 56 is depressed, release of
the bolt assembly when arm 74 is in normal position.
plunger permits the bolt return spring to drive the bolt
Spring 70 is strong enough to urge slider 62 to the far
assembly forward stripping another round from the belt.
side of the receiver and position lever 103 such that end
Firing again commences.
100 of crank 101 retains feed arm 73 in the position
to boss ‘84. Spring 108 acting between body 71’ and
rear web 105 biases arm 74 in the clockwise direction as
shown in FIGURE 2. In such position, arm 73 extends
, Those skilled in the art can now appreciate that this
into the path traversed by bolt assembly 26 when the 50 invention permits the recoiling barrel to index the belt
without affecting the time required for the bolt assembly
latter recoils on the barrel assembly. FIGURES l and 2
to traverse its recoil and counter-recoil displacement.
show the relative positions of the barrel assembly, bolt
In addition, the shock of the recoiling barrel is absorbed
assembly and feed arm at the instant the gun is ?red.
prior to indexing the belt so that shock loading of the
The closed end of housing 86 abuts one edge 110 of
As above 55 belt does not occur. By the above-described novel ar
rangement, hand charging of the gun can also easily be
carried out utilizing the same components.
recoil as a unit. Such initial recoil imparts rearward
What is claimed is:
movement to housing 86 without causing plunger 89 to
1. In a machine gun for ?ring cartridges that are fed
move. After pivoting movement of accelerator 24 causes
the, bolt assembly to be unlocked from the barrel as 60 to the gun linked together, the combination of a receiver,
a barrel assembly slideably mounted in said receiver for
sembly, the bolt assembly begins its recoil movement on
reciprocation between battery and recoil positions, a
the barrel assembly and travels toward arm 73. Mean
barrel extension 19 when the gun is ?red.
described, the barrel assembly and bolt assembly initially
while, the recoil of the barrel assembly compresses spring
chamber in said barrel assembly for holding a cartridge,
92 to a solid condition. Spring 92 at this time has ab
a bolt assembly slideably mounted on said barrel assem
Head 94 acting on cam face 96 of arm 73 causes the
chamber is ?red and a second terminal position remote
sorbed the initial shock of the recoiling barrel assembly 65 bly for reciprocation thereon between a ?rst terminal
position adjacent said chamber where a cartridge in the
and begins to cause plunger 89 to move rearwardly.
from the chamber where a cartridge extracted from the
latter to pivot about pin 95 from its position in the path
chamber can be ejected from the receiver, actuatable
traversed by the bolt assembly (FIGURE 2) to its posi
tion out of the path of the bolt assembly (FIGURE 3). 70 ratchet feed means, actuation of said feed means indexing
linked cartridges into the receiver, a feed arm having one
The geometry is such that plunger 89 acts prior to the
end pivoted relative to the receiver, the other end of
time that the recoiling bolt assembly would contact cam
portion 99 on arm 73. As arm 73 pivots out of the path
said feed arm being engaged with said ratchet feed means,
of the bolt assembly, the latter strikes projection 109
spring means for releasably maintaining said feed arm
causing ejector arm 74 to pivot about pin 107. The 75 in the path traversed by the bolt assembly when the latter
3,039,364 I
moves from its ?rst to its second terminal position, said
feed arm being pivotal out of the path of said bolt as
sembly for actuating said ratchet feed means, ?ring of
a cartridge in the chamber causing said barrel assembly
to move from battery to recoil position, movement of
said barrel assembly toward recoil position causing said
the linked cartridges to be indexed into the receiver, a
feed arm having one end pivoted relative to the receiver,
the other end of said feed arm being engaged with ‘said
ratchet feed means, resilientmeans for releasably main
taining said feed arm in the path traversed by. the bolt
assembly when the latter moves from its ?rst to its second
terminal position, said feed arm being pivotal out of the
path of said bolt assembly for actuating said ratchet feed
minal position, and means repsonsive to movement of
means, ?ring of a cartridge in the chamber causing said
the barrel assembly toward recoil position for pivoting
said feed arm out of the path of said bolt assembly be 10 barrel assembly to move from battery to recoil position,
movement of said barrel assembly toward recoil position
fore the latter contacts the feed arm.
causing said bolt assembly to move from its, ?rst to its
2. In the machine gunof claim 1 wherein said bolt
second terminal position, a housing slideably mounted
assembly extracts a cartridge from the chamber when
on said receiver, said barrel assembly having a portion
said bolt assembly moves to its second terminal position,‘
an ejector arm pivotally mounted on said receiver, and 15 engageable with said housing when saidbarrel assembly
moves toward recoil position for moving said housing,
an ejector spring urging said ejector arm into the path
and resilient means interposed between said housing an:
traversed by the bolt assembly when the latter ‘moves
said feed arm, movement of said barrel assembly toward
from its ?rst to its second terminal position, :movement
recoil position causing said portion thereon to strike said
of said bolt assembly to its second terminal position caus
bolt assembly to move from its ?rst to its second ter
ing it to strike said ejector arm and cause the latter to 20 housing and move the same, said last named resilient
means absorbing the impact energy of ‘said portion on
pivot and engage the extracted cartridge whereby the
said housing,>the impact energy absorbed by said last
latter is ejected from the receiver.
named resilient means being effective to pivot said feed
3. The combination of claim 1 wherein said bolt as
arm out of the path of said bolt assernblytbefore the
sembly has means for manually moving the'same on the
.
barrel assembly from the ?rst terminal position of the 25 latter contacts the feed arm.
5. The combination of claim 4 wherein movement of
' bolt assembly to the second terminal position whereby the
said bolt assembly to its second terminal position extracts
feed arm is engaged and caused to pivot formanually
the ?red cartridge from the chamber, said machine gun
actuating the ratchet feed means independently of movehaving an ejector arm pivotally mounted on. said re
ment of the barrel assembly.
ceiver, and means for resiliently urging said, ejector arm
4. In a machine gun for ?ring cartridges that are feed
into the path traversed by the bolt assembly when the
to the gun linked together, the combination of a receiver,
latter moves from its ?rst to its second terminal position,
a barrel assembly slideably mounted in said receiver for
movement of said bolt assemblyto its second terminal
reciprocation between battery and recoil positions, a
position causing it to strike said ejector arm and cause
chamber in said barrel assembly for holding a cartridge,
the latter, to pivot and engage the ?red cartridge for
a bolt assembly slideably mounted on said barrel assem
ejecting the same from the receiver.
bly for reciprocation thereon between a ?rst terminal
position adjacent said chamber Where a cartridge in the
chamber is ?red to a second terminal position remote
from the chamber where a cartridge extracted from the
40
chamber can be ejected from the receiver, actuatable
ratchet feed means, actuation of said feed means causing
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,655,837
2,821,886
Johnson _____________ __. Oct. 20, 1953
Friend et al. __________ .._ Feb. 4, 1958
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