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Патент USA US3058408

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Oct. 16, 1962
I. R. BARR
AUTOMATIC MACHINE GUN WITH RECOILING
3,058,398
BARREL AND HYDRAULIC ACCELERATOR
‘Filed Dec. 25, 1959
2 Sheets-Sheet 1
“I
INVENTOR.
[PW/IV A? BABE
BY
z a“
United States Patent 0 '
3,058,398
Patented Oct. 16, 1962
2
1
of rod 18 is such that ?ring pin 37 at the forward end
3,058,398
thereof engages the head of bullet 40 and thereby causes
AUTOMATIC MACHINE GUN WITH RECOILIN
it to ?re when movable member 26 is moved rearwardly
BARREL AND HYDRAULIC ACCELERATOR
relative to base member 25 for locking the breechblock.
Irwin R. Barr, Baltimore County, Md., assignor to Air
craft Armaments, Inc., Baltimore, Md., a corporation GI This action occurs by pushing the base member 25 for
wardly after the movable member 26 butts against the
of Ohio
Substituted for abandoned application Ser. No. 354,975,
forward end of barrel extension 6.
May 14, 1953. This application Dec. 23, 1959, Ser.
A ?uid-?lled hydraulic cylinder 10 formed rigid with
No. 861,714
housing 2 is adapted to slidably receive a driving piston
8 Claims. (Cl. 89-169)
10 11 adjacent its forward open end 12. In the opposite
end of hydraulic cylinder 10 a shock absorbing bu?er
This invention relates in general to ?rearms and more
piston 13 is arranged to move axially of the housing against
particularly to an automatic machine gun having a varia
ble rate of ?re.
An object of this invention is to provide an automatic
machine gun having a hydraulic accelerator for actuating
the breechblock and allowing the ?ring rate of the gun to
be controllably varied over a wide range.
Another object of this invention is to provide a machine
gun of simple and rugged construction and which is de
pendable in operation.
Still another object of this invention is to provide a
machine gun which is smoother in operation than machine
guns of conventional construction.
Further and other objects will become apparent from
a reading of the following detailed description taken in con
junction with the accompanying drawing wherein like
numbers refer to like parts.
.
In the drawing:
the action of a spring 14.
As shown in FIGURE 1 the
pressure exerted by spring 14 against buffer piston 13
may be varied by the adjusting plug 15.
A piston chamber 16 formed as a part of housing 2
and generally co-axially aligned with barrel 4 is provided
with an opening 17 at its forward end for receiving ac"
celerator rod 18. A driven piston 20 slidably carried
within chamber 16 is provided with an axial bore ar
ranged to slidably receive the rearward end 21 of rod 18
extending within the chamber. A head 22 formed on the
extreme rearward end 21 of ‘rod 18 projecting beyond
piston 20 butts thereagainst to limit the relative movement
between the piston and the rod so that as piston 20 is
caused to move rearwardly the breechblock is caused to
move with it. A port 23 connects cylinder 10 with cham
ber 16 so that ?uid within chamber 10, when pressurized
through the action of driving piston 11, will exert a force
FIGURE 1 is a fragmentary sectional side view of the
30 on driven piston 20 in chamber 16. A radial cut-out 24
machine gun of this invention.
in the outer periphery of the driven piston at the forward
FIGURE 2 is a section taken on line 2—2 of FIG
end thereof allows the ?uid pressure to exert a force urg
URE 1.
ing the piston rearwardly within chamber 16 even when the
FIGURE 3 is a section taken on line 3-3 of FIG—
URE 1.
_
The machine gun as shown in FIGURE 1 includes a
housing 2 having a generally cylindrically shaped opening
3 formed at its forward end for receiving a gun barrel 4.
Suitable bearing means 5 are provided in cylindrical
piston is in the extreme forward position butting against
the forward wall of chamber 16.
'
A breechblock buffer cylinder 41 is arranged rearwardly
of chamber 16 and forms a part of housing 2.
A bu?fer
piston 42, slidably received within cylinder 41, is urged in
opening 3 for supporting barrel 4 and allowing only axial 40 an extreme forward position, a shown in FIGURES l
and 2, by means of a spring 43 acting between piston 42
and an adjusting plug 44. An aperture 45 formed in pisa
sion 6 forming a breech is rigidly connected to the inner
movement thereof relative to the housing. A barrel exten
end 7 of barrel 4 so as to represent an integral part thereof.
As best shown in FIGURE 3 barrel extension 6 is sup
ported within housing 2 by projections 8 formed on the
inner wall of the housing so that it may move freely with
the barrel.
A breechblock 9 slidably carried by barrel extension 6
provides the means for loading, ?ring and unloading the
gun in response to axial recoil movement of the barrel. .
Breechblock 9 includes a base member or bolt slide 25
and a movable member or bolt block 26 slideably carried
by the base member. A pair of door-like locking mem
bers or cam means 27 and 28 are swingably carried by
movable member 26 through pins 29 and 30. Pins 31
and 32 provided on members 27 and 28 engage cam~like
slots 33 and 34 formed on base member 25. The shape
of slots 33 and 34 and such that when movable member
26 is moved rearwardly relative to the base member, the
ton 42 and in the rearward end of chamber 16 permits
rod 18 carried by the breechblock to extend into buffer
cylinder 41 as required to allow the necessary movement
of the breechblock for the loading and unloading opera;
tions of the gun. A breechblock return spring 46 acting
between piston 42 and base member 25 of the breech;
block urges the latter into the forwardmost locked position
shown in FIGURES 1 and 2. A guide pin 47 secured to
piston 42 and extending into an opening 48 formed in
breechblock 9 provides a suitable guide for spring 46.
A normally projecting extension 49 on barrel extension
6 carries a hammer 50 threadedly engaging extension 49
and co-axially aligned with opening 12 in the forward end
of chamber 10. Thus as barrel 4 is moved rearwardly
hammer 50 is caused to engage driving piston 11 in cham
ber 10 and compress the ?uid stored therein whereby to
exert a force on driven piston 20 for causing it to unlock
door-like locking members 27 and 28 are caused to move 60 and accelerate breechblock 9 rearwardly relative to the
barrel and barrel extension. Hammer 50 is spaced a pre
outwardly and engage notches 35 and 36 formed in barrel
determined distance from piston 11 to permit barrel 4 and
extension 6 and thereby lock the breechblock relative to
breechblock 9 to move rearwardly together a short dis
the barrel extension. Thus, locking members 27 and 28
tance while the gasses within the barrel produced by ?ring
are similar to latches, and notches 35 and 36 are similar
to keepers. An accelerator rod 18, generally co-axially 65 a round of ammunition are allowed to subside so as to
avoid “blowback” and to permit unlocking of the breech;
aligned with barrel 4, is ?xedly secured to base member 25
block. By varying the distance of hammer 50 from piston
of breechblock 9 by means of pin 19. The forward end of
rod 18 is formed as a ?ring pin 37 which is adapted to
11, the ?ring rate of the gun may be varied since this ad
justment controls the amount of energy which will be im-i
The forward end of movable member 26 is formed with 70 parted to driving piston 11.
project through an opening 38 in movable member 26.
a T-slot 39 for supportingly engaging the head of an am
munition round as best shown in FIGURE 2. The length
Additional control over the ?ring rate of the gun may
be provided as shown in FIGURE 1 wherein piston 51
3,058,398
3
4
carried by extension 49 is arranged'to engage a spring 52
into the forward most position for transmitting the reac
tion forces produced by ?ring the round to the barrel and
within a housing 53 so that the rearward movement of the
barrel and its extension may be opposed by the spring for
absorbing a part of the energy of the moving barrel. Ad
justing means 54 may be provided for varying the amount
of ‘force exerted on piston 51 by spring 52.
Suitable means for urging barrel 4 into its forwardmost
barrel extension. Thus as the shell is ?red, the reaction
forces cause the barrel and its extension to move rear
wardly against the action of barrel return springs 57 and
58. Breechblock 9 remains locked to the barrel extension
6 for a short distance of rearward recoil movement of the
barrel to permit the gases produced vby ?ring to subside.
position is shown in FIGURE 2 wherein a pair of pistons
After the barrel is moved rearwardly a short distance,
55 and 56 carried by barrel extension 6 engage springs 57
and 58 carried by housing 2.
10 hammer 50 carried by extension 49 engages driving piston
11 and compresses the ?uid within chamber 10. Rear
Trigger means for controlling the operation of the gun
ward movement of barrel 4 is limited by extension 49 en
is shown in ‘FIGURE 1 wherein a latch 59 is pivotally
gaging the forward end 12 of the cylinder. The shock
carried by a piston 60 slidably supported for limited axial
load applied to driving piston 11 is cushioned by bulfer
movement within bracket 61. A spring 62 within bracket
61 contacts piston 60 for absorbing shock loads applied to 15 piston 13 in cooperation with spring 14. The pressurized
?uid reacts against driven piston 20 causing it to be driven
latch 59. A spring urged plunger 63 is carried by latch 59
rearwardly within its chamber 16. As piston 20 is driven
so as to engage the wall of housing 2 and urge the latch
rearwardly, rod 18 is also pulled rearwardly relative to
into a downward position for engaging a notch 64 formed
member 26 causing door-like locks 27 and 28 to be swung
in breechblock 9. When the breechblock is moved to its
rearwardmost position, so as to be engaged by latch 59, it 20 inwardly as guided by cams 33 and 34 and unlock breech
block 9 from the barrel extension. Further movement of ,
is prevented from moving forward until the latch is disen
piston 20 causes the breechblock to be accelerated rear
gaged. An actuating lever 65 pivotally carried by housing
wardly with considerable force whereby the breechblock
2 through pin 66 engages a projection 67 on latch 59 so
engages buffer piston 42 whence it is decelerated and
that by rotating lever 65 the breechblock may be unlocked
and the gun allowed to operate.
25 started on its forward stroke. As the breechblock is
A door 68 forming ‘a part of housing 2 is hinged at 69
to provide access to the breechblock and other gun mecha
moved rearwardly the loading mechanism, actuated by
lever 73, positions a second round of ammunition ahead
of the breechblock and in line with T-slot 39. While the
nism. Lock means 70.is provided for releasably securing
breechblock is still moving rearwardly, the barrel and bar
door 68 in its closed position shown in FIGURE 1.
As best shown in FIGURE 3, openings 71 are provided 30 rel extension is returned to the most forward position by
the action of springs 57 and 58. The forward motion of
on either side of housing 2 through which ammunition
breechblock 9, as effected by return spring 46, *actuates
rounds may be fed to the gun. An opening 72, provided
suitable mechanism (not shown) for ejecting the empty
in the under side of barrel extension 6 and housing 2 pro
shell and for replacing it with the second round of am
vide a path for ejecting the empty cartridges from the gun
breech after ?ring.
35 munition in coaxial alignment with barrel 4. As the
breechblock continues to move forwardly, the new round
The details of the gun mechanism for feeding the am
munition into the gun breech and for ejecting the shells is
is pushed into ?ring position, the breechblock is locked
not shown since this mechanism does not form a part of
relative to barrel extension 6, the ?ring pin moves for
wardly relative to breechblock movable member 26 and is
this invention. Any conventional arrangement for per
forming this function may be employed. As shown in 40 ?red. The ?ring of the second round causes the barrel and
its extension member to move rearwardly as previously
FIGURE 1, a lever 73 is pivotally carried by door 68
described to actuate the breechblock accelerator and pull
through pin 74 so that one end thereof will engage a
groove 75 formed in the upper surface of breechblock 9
another round of ammunition into the gun to start an
as best shown in FIGURE 3. Groove 75 serves as a cam
other ?ring cycle. The gun will continue to ?re in this
whereby movement of the breechblock will produce con 45 manner so long as trigger member 65 is pulled to prevent
latch 59 from engaging notch 64 on the breechblock. By
trolled rotation of lever 73. The free end of lever 73 is
releasing member 65, latch 59 is allowed to engage the
provided with a pawl arrangement (not shown) for en
breechblock notch and prevent continued operation.
gaging a round of ammunition so as to pull it into posi
It should be noted that the pin-and-slot connection 31,
tion forwardly of the breechblock so that the head of the
32, 33, 34 between members 25 and 26 serves to couple
cartridge will engage T-slot 39 and thereby enable the
the latter in a particular manner. When member 26 abuts
breechblock to push it into ?ring position as shown in
the barrel adjacent the chamber, and spring 46 moves
FIGURES 1 and 2.
member 25 forwardly relative to member 26, the pin-and
The operation of the gun can best be described by as
slot connection causes locking members 27, 28 to pivot
suming that the ?ring cycle begins with breechblock 9
being held in its rearwardmost loading position by latch 59 55 outwardly into notches 35, 36 as the ?ring pin 37 slides in
of the trigger mechanism. At that time an ammunition
cartridge is positioned between the breechblock and the
barrel in line with T-slot 39. As the trigger is pulled, ro
tating lever 65, latch 59 is caused to pivot so as to release
opening 38 in member 26 to ?re cartridge 40. When the
hydraulic accelerator causes member 25 to move rear
wardly relative to member 26 during recoil movement of
the barrel, the pin-and-slot connection causes locking
members 27, 28 to pivot inwardly out of notches 35, 36.
the breechblock whereby return spring 46 forces the
breechblock forwardly to the position shown in FIGURES
When member 25 moves further rearwardly relative to
1 and 2. As the breechblock is moved forwardly, the
the chamber, the pin-and-slot connection couples mem
loading mechanism (not shown) forces the round into
ber 26 to member 25 and causes such further rearward
coaxial alignment with barrel 4 and into engagement with
movement to slide member 26 to its unloading position.
T-slot 39 whereby when the breechblock reaches the for 65 When return spring 46 moves member 25 forwardly on its
wardmost position shell 40 is secured within barrel 4.
counter-recoil stroke, a side of the barrel extension upon
Further forward movement of breechblock base member
which the breechblock is slideably mounted prevents the
25 relative to movable member 26, which occurs after
locking members from rotating to their outward positions
movable member 26 engages the forward wall of barrel
so that the pin-and-slot connection couples member 26 to
extension 6, causes ?ring pin 37 to project through aper_ 70 member 25 and causes the former to move forwardly
ture 38 and engage the head of shell 40 causing it to ?re.
into abutting relation with the barrel adjacent the cham
The forward movement of base member 25 relative to
ber.
movable member 26 also causes door-like locks 27 and 28
‘By moving hammer 50 a greater distance from driving
to swing outwardly so as to engage notches 35 and 36
piston 11 than is required to prevent “blowback,” the
formed in barrel extension 6 and lock the breechblock 75 ?ring rate of the gun may be decreased in accordance with
3,058,398
the change in stroke of piston 11. Additional control
taching said movable member from said barrel extension
over the ?ring rate may be had by regulating the force
exerted by spring 52 as shown in FIGURE 1 whereby to
and then causing said connection means to couple said
movable member to said base member for moving said
movable member to its recoil position, an hydraulic cyl
oppose the recoil movement of barrel 4.
inder containing ?uid, a driving piston for pressurizing
The use of the buffer piston 13 for absorbing shock
'
said ?uid upon actuation thereof, a driven piston con
loads and preventing the occurrence of sudden pressure
nected to said base member, said driven piston being re
changes in the ?uid also functions to accelerate the breech
sponsive to pressurization of said ?uid for moving said
block after the barrel and barrel extension have com
base member rearward of its foremost position, and ham
pleted their rearward movement because of the energy
stored in the buffer piston spring 14. This is most desir 10 mer means on said barrel extension engageable with said
driving piston during recoil movement of the barrel to
able since it allows the force applied to accelerate the
ward recoil position for actuating said driving piston.
breechblock to be continued over a longer period of time
2. An automatic machine gun in accordance with claim
than with accelerators of conventional construction where
1 wherein said hammer means is spaced from said driv
by peak loads may be less and still impart the same
amount of energy to the breechblock as would be im 15 ing piston when the barrel is at battery position so that
the driving piston is actuated after limited recoil movement
parted by a larger accelerating force applied over a short
of the barrel whereby said base member is moved rear
Therefore, the breechblock and its associated
er time.
ward of its foremost position after such limited recoil
structure will not be stressed as heavily as those parts in
movement of the barrel.
conventional machine gun construction whereby the parts
3. An automatic machine gun in accordance with claim
may be made less rugged and consequently lighter in 20
1 including: a buffer piston, and spring means resiliently_
weight. A further important operational advantage is
urging said buffer piston in one direction, said buffer piston
obtained by reducing the peak accelerating loads, in that
being responsive to pressurization of said ?uid for mov
the gun will operate more smoothly.
ing said buffer piston in the opposite direction to com~
Though the machine gun has been shown and described
in considerable detail, it is to be understood that certain 25 press said spring means whereby said spring means ab
sorbs shock loads applied to said driving piston and
alterations, modi?cations and substitutions may be made
assists movement of said base member rearward of its
without departing from the spirit and scope of the inven
foremost position.
tion as de?ned by the appended claims.
4. An automatic machine gun comprising, a housing,
As used in this application, the barrel is considered to
be “in battery" when it is fully returned from recoil, and 30 a barrel extension, a barrel attached to said barrel ex
tension, said barrel extension and barrel being slideably
the barrel is considered to be “out of battery” when it is
ment” are used to mean the backward movement of the
mounted in said housing for recoil movement as a unit
from a battery to a recoil position, said barrel having a
barrel or part thereof on ?ring caused by the backward
pressure of the propellent gases, and the distance that the
barrel or part thereof travels in this backward movement.
chamber adjacent one end of the barrel extension for
holding a cartridge, a base member slideably mounted
on said barrel extension for reciprocation thereon be
The words “counterrecoil movement” are used to mean
the forward movement of the barrel or part thereof re
pin rigidly attached thereto, reciprocation of said base
turning to ?ring position (battery) after recoil.
This application is a substitution application for Serial
40 of the barrel extension causing said ?ring pin to contact
No. 354,975, ?led May 14, 1953, now abandoned.
What is claimed is:
1. An automatic machine gun comprising a housing, a
chambered gun barrel mounted in said housing for recoil
tension between operative and inoperative positions, the
operative position of said movable member being adjacent
not fully returned from recoil.
The words “recoil move
tween terminal positions, said base member having a ?ring
member to one terminal position adjacent said one end
and ?re a cartridge in the chamber, a movable member
mounted for reciprocatory movement on said barrel ex
said one end of the barrel extension for engaging the
movement‘ from a forward in-battery position to a rear
ward recoil position, a barrel extension attached to the 45 base of the cartridge to retain the same in the chamber,
the inoperative position of said movable member being
rear portion of said barrel adjacent the chamber, a mov
remote from said one end of the barrel extension for
able member slideably mounted on said barrel extension
etfecting removal of a cartridge from the chamber, a
and having a ?ring position adjacent the rear portion of
locking member movably mounted on said movable mem
the barrel and a recoil position remote from said rear por
tion, a locking member pivotally mounted on said mov 50 ber, notch means on said barrel extension adjacent said
one end, said locking member being engageable with said
able member, a base member slideably mounted on said
notch means when the movable member is in operative
barrel extension rearward of said movable member, con
position, said locking member when engaged with said
nection means between said base member and said lock
notch means being effective to cause the movable member
ing member, said base member having a ?ring pin rigid
to retain the cartridge in the chamber against the pressure
therewith for contacting a cartridge in the chamber to
of the propellent gases generated when the cartridge is
?re the same when the base member is at a foremost po
sition relative to the barrel extension, a driving spring for
moving said base member to said foremost position,
means for causing said connection means to couple said
'movable member to said base member when said driving 60
spring moves said base member toward said foremost po
sition until said movable member is at ?ring position,
movement of said base member to said foremost position
causing said connection means to move said locking mem—
ber into locking engagement with said barrel extension
for attaching said movable member to said barrel exten
sion as said ?ring pin contacts and ?res the cartridge in
the chamber, ?ring of the cartridge causing an initial re
coil movement of the barrel and barrel extension toward 70
recoil position with said movable member locked to said
?red, connection means interconnecting said base member
with said movable member so that reciprocation of said
base member to said one terminal position simultaneously
causes movement of said movable-member to its operative
position and engagement of said locking member with said
notch means as the ?ring pin contacts and ?res the car
tridge in the chamber whereby the barrel extension and
barrel is caused to move as a unit from battery to recoil
position, said connection means interconnecting said
base member with said movable member so that move
ment of said base member from said one terminal posi
tion to its other terminal position initially causes dis
engagement of said locking member from said notch
means and movement of said movable member to its in—
operative position, and means responsive to recoil of the
barrel from battery toward recoil position to move said
base member from said one terminal position on said
said base member rearward of its foremost position ?rst
barrel extension to said other terminal position while
causing said connection means to move said locking mem
ber out of engagement with said barrel extension for de 75 said barrel is recoiling for causing said connection means
barrel extension, movement on said barrel extension of
3,058,398
to effect ?rst disengagement of said locking member from
urging the latter forwardly toward ?ring position; an
said notch means and then movement of said movable
member from its operative position to its inoperative
accelerator on said housing engageable by said barrel
extension during recoil movement of said barrel for
position while said barrel is recoiling.
_
5. In an automatic machine gun having a housing, a
moving said base member from ?ring position to recoil
position against the action of said driving spring; a bolt
longitudinally movable barrel carried by said housing and
a movable member carried within said housing for guided
block having an aperture therethrough and mounted on
movement from a ?ring position adjacent said barrel to a
said barrel extension between said base member and said
chamber so that said aperture is coaxial with said cham
loading position spaced from said barrel, releasable lock~
ber, said ?ring .pin being slideably mounted in said aper
ing means on said movable member engageable with 10 ture and said bolt block being axially slideable on said
barrel extension for movement from a rearward recoil
said barrel for releasably locking said movable member
position remote from the chamber to a forward ?ring
to said barrel when said movable member is at ?ring
position abutting the chamber; a locking member hinged
position, a base member engaged with said locking means
to said bolt :block 'for rotation from an inward position
and said movable member and movable from one ter
substantially parallel to said axis to an outward position
minal position where it causes said locking means to
inclined relative to said axis; and a pin on one member
retain said movable member at ?ring position to another
engaged in a slot in the other member to de?ne a pin
terminal position where it retains said movable member
and-slot connection means that connects said base mem
at loading position, and a hydraulic accelerator compris
ber to said locking member; said connection means caus
ing, a ?uid-?lled chamber rigidly carried by said hous
ing, a piston slideably carried within said chamber ad 20 ing said locking member to rotate to its outward posi
tion when said base member moves ‘forwardly relative to _
jacent one end thereof for pressurizing the ?uid upon
actuation, p'iston actuating means rigidly carried by said
barrel for actuating said piston and pressurizing the
said bolt block su?iciently to project said tiring pin for
wardly of said bolt block, said connection means causing
said locking member to rotate to its inward position when
?uid within said chamber in response to rearward recoil
movement of said barrel, and actuating means connecting 25 said base member moves rearwardly away from said
bolt block sufficiently to withdraw said ?ring pin into
with said base member and responsive to the pressure
said bolt block, said connection means coupling said base
generated in said ?uid during said rearward recoil move
member to said bolt block when said locking member
ment for forcefully moving said base member from said
is in its inward position ‘for causing said bolt block to
one terminal position to the other terminal position while
said barrel is recoiling for ?rst causing the release of said 30 move with said base member when the latter moves rear
wardly; said barrel extension having a side engageable
locking means and then movement of said movable mem
with said locking member when said bolt block is between
ber from ?ring position toward loading position while
recoil and ?ring position ‘for preventing said locking mem
said barrel is recoiling.
ber from rotating to its outward position, said connection
6. In a machine gun having a housing, a longitudinally
means coupling said bolt block to said base member when
movable barrel carried by said housing and a breech
said locking member is prevented from rotating to its
block carried within said housing for guided movement
outward position by said side ‘while said driving spring
from a ?ring position adjacent said barrel to a loading
moves said base member forwardly toward ?ring position
position spaced ‘from said barrel, a ?rst hydraulic- cylin
for causing said bolt block to move forwardly with said
der containing ?uid, a driving piston clideably mounted
in said ?rst cylinder adjacent one end thereof vfor pres 40 base member until said bolt block reaches ?ring posi
tion, said barrel extension having a notch which effects
surizing said ?uid upon displacement toward the other
rotation of said locking member to its outward position
end of said ?rst cylinder, a second hydraulic cylinder con
when said bolt block is at ?ring position, movement by
nected to said ?rst hydraulic cylinder, a driven piston
said driving spring of said base member to ?ring posi
slideably mounted in second cylinder for displacement
tion when said bolt block is in ?ring position causing
therein in response to pressurization of said ?uid, means
said connection means to rotate said locking member to
connecting said breechblock with said driven piston so
its outward position and into said notch and said ?ring
that displacement of the latter causes said breechblock
pin to slide forwardly in said aperture until it projects
to be moved from ?ring to loading position, and hammer
forwardly to said bolt block and ?res a cartridge in said
means rigidly carried by said barrel engageable with said
chamber, said locking member when in outward position
driving piston during recoil movement of said barrel
for displacing said driving piston toward said other 50 in said notch preventing rearward movement of said
bolt block toward its recoil position whereby said bolt
end of said ?rst cylinder and pressurizing said ?uid where
block is attached to said barrel extension when a car
by said driven piston is displaced and said breechblock
tridge is ?red, initial rearward movement of said base
is moved to loading position.
member by said accelerator from ?ring position toward
7. In the machine gun of claim 6, a buffer piston in
said ?rst cylinder, and a compressible buffer spring, pres 65 recoil position causing said ?ring pin to slide rearwardly
in said aperture until it is withdrawn into said bolt block
surization of said ?uid when said driving piston is dis
placed by said hammer means acting on said buffer pis
ton to displace the same and compress said bu?er spring
for absorbing shock loads applied to said driven piston
and ‘for pressurizing said ?uid after recoil movement of
the barrel is completed.
8. An automaic machine gun comprising: a housing,
a ‘gun barrel having an axial chamber in which a cartridge
is adapted to be ?red, said barrel being axially slideable
on said housing for recoil movement from a forward in
battery position to a rearward recoil position; a barrel
extension rigidly attached to said barrel adjacent the
chamber; a base member having a ?ring pin thereon
and mounted on said barrel extension so that said ?ring
and causing said connection means to rotate said locking
member out of said notch to its inward position whereby
said bolt block is detached from said barrel extension,
further rearward movement of said base member by ‘said
accelerator to recoil position causing said connection
means to couple said bolt block to said base member
whereby said bolt blmk is moved rearwardly to recoil
position by said base member.
References Cited in the ?le of this patent
UNITED STATES PATENTS
690,955
1,351,141
pin is coaxial with said chamber, said base member being 70 1,906,800
axially slideable on said barrel extension \for movement
from a rearward recoil position remote from the cham
ber to a forward ?ring position adjacent the chamber
where the ?ring pin is adapted to strike and ?re a car
tridge; a driving Spring acting on said base member for 75
Home ______________ -_ Ian. 14, 1902
Thompson ___________ __ Aug. 31, 1920
Marek ______________ .._ May 2, 1933
1,987,939
2,453,830
Chadwick et al. ___..,_____ Nov. 16, 1948
812,040
Great Britain _________ _- Apr. 15, 1959
Lahti ________________ __ Jan. 15, 1935
FOREIGN PATENTS
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