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Патент USA US2124911

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July 26, 1938.
R. DARNE
2,124,911
AUTOMATIC FIREARM
Filed June 19, 1935
2 Sheets-Sheet 1
Patented July 26, 193g
2,124,911
\
circo «STATES ïPATÈENT OFFICE
‘ 2,124,911
AUToMATIo FIREARM
Regis Dai-ne, >`St. Etienne, France
Application June 19, 1935,-.Serìal No. 27,435
In France June 29, 1934
5 Claims.
_ _
The a; present invention relates to automatic
firearms- and its object is to provide a firearm of
this kind which is safer to operate, easier to take
Preferred embodiments of the present inven
tion will be hereinafter described with reference
to pieces, and of higher precisionthan firearms
by`wayof example, and in which:
5 of the same kind made up to this time.
A first feature of the present invention con--
_sists in arranging the parts of the cartridge lift
in_g conveyer in such manner that the cartridges
cannot escape accidentally from said conveyer
10 under the effect of the vibrations due to the
shock of the action carrier against the rear Vplate
of the breech receiver. Furthermore, accord
ing to the invention, this cartridge lifting con
veyer is so arranged‘that, when it reaches its
15 higher position it can move down only when the
cartridge is nearly wholly engaged into the cham
benthus preventing any possible distortion of the
cartridge when the latter is fed to the barrel.
a
a According to another‘feature of the present
2ï) invention, the member intended to limit the, dis
placement of the action carrier toward the front
is devised in such manner `as to further act as
locking> means for the cartridge lifting conveyer
and -also to be able to guide the movable breech
125 in perfectly axial relation with‘the barrel.
Still another vfeature of the present invention
consists in special means‘for fixing the feed
cam on the action carrier andin the> provision
of a servo-pawl device intended to render im
"gjö possible the incident knownunder the name of
“double feed”, this incident _consisting in a jam
ming of the cartridges in the feed passage as a
result either of a blunder of the person who uses
_ _ the firearm or of an insufficiently long Astroke of
the mechanism'when the firearm is in action. i
VStill another feature of the present"` invention
consists in the provision of a connecting rod
stopping device adapted to act both ways, this
_
(Cl. 89-2)
device being intended on the one hand to limit
a yielding manner the displacements of the
feed connecting rods which are always brought
at the optimum 'angle into contact with the feed
cam, andlon the other hand to permit the as
p sembling of the parts of the firearm whatever
be’tlie position of the 'pawl carrying slider.
` ing a strong locking of the barrel, permits it to ex
` pand withoutiimpairing the precision of the arm
_
¿il
or disturbing its working.
"
Finally, still another feature of the present
invention consists in the 4provision of a device
which serves to lock the guard in its slideway on
_
the breech receiver and „also to yieldingly main,
iîï? tain the safety member in either of its positions
“firing”, and “safety”.
Figs. 1 and 2 are' a'longitudinal sectional view
and a transverse sectional View, respectively, il
lustrating the structure and operation of the
cartridge lifting _ conveyer;
Fig. 3 is a.- longitudinal view, in section, of the
device for fixing the feed cam to the action car
rier;
,
Fig. 4 is `a transverse sectional View of the
firearm showing the servo-pawl in operation, be
fore the cartridge in position in the feed passage
has been withdrawn from the band of cartridges;
Fig. 5 is a longitudinal vertical sectional View
corresponding to Fig. 4;
5
,
_ _ Fig. 6,is a View similar to Fig. 4, showing the
parts in the position they occupy when the car
tridge `has been withdrawn from the band;
N.)
Eig. `'7 'is a general sectional View showing the
whole ofthe firearm.
The action carrier or frame I (Fig. l), which
carries _breech block 2, is violently thrown to
ward the rear by the gases. It ñrst strikes the
buffer 3a and then the closure plate 3. Due to
inertia, cartridge 4 has a tendency to slide in the
jawsv 5% of conveyer 5 and to escape upwardly
therefrom under the action of incline 6e which
cooperates in `,disengaging _the cartridge from n
saidV conveyer when said cartridge is engaged into 0
theuchamber ofthe barrel. Several devices were
suggested, prior tothe present invention, for
causing this part 6 to play the part of an ob
turator.
_
_
_
_
__
_
l _Breech receiver _1 is provided with .two projec- 35
tions l? and _11? andconveyer 5 is providedwith
a heelhorzprojection 5c arranged in such manner
that the rear end of the spring 8 of the conveyer
engages said heelwhen the conveyer is in its
upper position. _According1y,_conveyer 5 is pre- 40
vented from moving downwardly when the shock
ofÁ carrier II on closure‘plate 3 occurs. On the
other hand, the space _between projections 'la and
‘IP is suflicientfor permitting the jaws of the
i
Still another feature of the present invention
consists in ‘providing means which, while ensur»
v
to 'the accompanying drawings, given merely
conveyer, carrying a cartridge, to pass there- 45
betweenMbut the jaws cannot move apart from
each other, so that cartridge 4 can neither slide
toward `the rear `nor _escape upwardly, this being
due 'also 4to _the fact that the jaws 5a and 5b of
the conveyer ‘are engaged in the groove of the 50
cartridge Vand are of slightly enveloping shape.
, However, Ait is necessary that the conveyer
should be able to move downwardly _in the course
of its forward movement, so as to be able to
catch another cartridge in the feed passage. 55
2
2,124,911
For this purpose, when bent member 9, which
serves chieñy to guide the front part of the car
tridge toward the chamber, cornes into- contact
with the lowering pin I0, this lever is compelled
to pivot about its axis 921. The heel 9b of this
member 9 then compresses spring 8 downwardly
and disengages it from heel 5C, thus releasing
conveyer 5, which can then move downwardly.
This arrangement prevents any possibility of the
cartridges being distorted when they enter the
chamber, since the respective positions of mem
bers 5 and I@ are so determined that the disen
gagement of the cartridge from the conveyer and
its insertion into the chamber take place before
the conveyer can move down.
Piece II, when it strikes the lowering pin III,
serves to limit the stroke of the action carrier
toward the front. This piece is connected to
tongue I2 through a stirrup I3, and this arrange
20 ment enables it to undergo without damage the
vibrations and shocks to which it is subjected
for each stroke of the action carrier. VAs a mat
ter of fact, piece II bears constantly against the
action carrier, at IIa and IIb, without spindle I2
25 undergoing any stress, owing to the fact that
stirrup I3 permits it to slide with respect thereto
until it reaches its optimum position. Further
more, the movable breech block, which bears
against the action carrier, at la, in the rearward
30 direction, and against piece II, in the frontward
direction, is consequently guided in a satisfac
tory manner in the axial direction with respect
to the barrel. Finally, when bolt 2 is removed,
it suffices to pivot the whole of the system II»
35 IZ-Iä about spindle I2@ into a position at right
angles to the axis of the action carrier in order
to easily remove conveyer 5, and also pieces 24
and 5, which are normally attached thereto.
Feed cam i5 (Fig. 3) is ñxed on the action
40 carrier I by means of two pins I'b and Id which
limit its position toward the rear, toward the top
and toward the bottom. A stop piece I5, pivoted
at IC, prevents the cam from moving toward the
front when the nose I5à of said piece I5 is en
45 gaged in a notch I@a of piece I4. This piece I5
is provided with a notch I5b in which is engaged
the nose 8a of the spring 8 of the conveyer.
When, by means of any tool, introduced through
a slot provided in piece I5, the nose I5a of piece
50 I5 is depressed out from notch Ma, cam I4 is free
to move toward the front and can thus easily be
removed. After the removal of piece I4, piece I5,
under the action of spring 8, pivots upwardly
about axis IC until its heel I5c comes into contact
55 with pin Id. Spring 3 then escapes from notch
I5b. The remounting is effected in the reverse
order. It suffices to insert the end 8a of spring
8 into notch I5lo and then to compress said spring
through piece I5, which is depressed by cam I4,
60 the latter being caused to slide toward the rear
until the nose i5a ofzstop piece I5 engaged notch
Iëla. A bent pin, introduced into holes Ie and If
acts as a’ safety member which can be placed in
position only when cam I ll is well fitted in posi
65 tion. One of the branches of this pin further
prevents piston i5 from turning about itself. A
hole, provided at Ig, makes it possible to verify
that spring 8 is properly engaged in notch I5b.
As shown in Figs. 4, 5 and 6, cartridges 50, 50a,
70 55h, etc., mounted in links 5I, Sla, 5Ib, etc., are
fed successively into position in line with the axis
of the machine gun, so as to be ready to be
caught by the conveyer, the feed movement being
imparted to the band of cartridges by pawl 55,
75 pivotally mounted on slider 56, itself controlled
by connecting rods interconnected with the ac
tion carrier. It will be readily understood that,
if, for some reason, and especially due to an in
suñiciency of the stroke, the conveyer does not
catch the cartridge, it would be impossible to
rearm the machine gun if pawl 55 were capable
of bringing cartridge 5I)a into the position occu
pied by cartridge 50 while the latter has not yet
been extracted from the band by the conveyer.
In order to avoid this incident, commonly 10
called “double feed”, the action of the pawl is
controlled by a member 5T or “servo-pawl”. As
long as cartridge 55 has not been removed from
the band of cartridges, and from the feed pas
sage, by the conveyer, it keeps servo-pawl 5l, 15
pivoted at 51a to slider 56 in lowered position.
The nose 5'!b of said pawl 51 acts on pawl 55,
itself pivoted at 55a and keeps it in inoperative
position.
It should be noted that, in Fig. 5, cartridge 5I!
is suspended in the feed passage between the
upper stop member 52 and the lower stop mem
ber 53, on the one hand, and fork 54, on the other
hand.
Cartridge 5B depresses servo-pawl 5l
through link 5I .
25
In normal operation of the machine gun, car
tridge 50 is withdrawn from the band. Conse
quently, the link 5I in which said cartridge was
carried can now move upwardly (Fig. 6) and
ceases to depress servo-pawl 5l, which releases 30
pawl 55. The latter is thus in a position to
bring a new cartridge 5E)ad into the place of the
cartridge 50 removed from the conveyor.
The gun shown is of the type actuated by gas.
The bolting of the movable breech 2 between the 35
back of the gun and the breech receiver 'I in
the specification 'Ia provided for that purpose as
well as the unlocking of the breech 2 are pro
duced by the movements of the carrier mecha
nism I. The carrier mechanism is actuated in 40
the usual manner by admitting a portion of the
combustion gases so as to act upon the piston I6
located in advance of the carrier mechanism and
on the other hand by the reaction action of the
spring a. The admission of a portion of the
combustion gases is secured through the gas
chamber ‘I6 which is in communication with the
barrel 'I5 of the gun and with the tube 'I8 lo
cated in front of the piston I5.
When a shot is ñred the entire assembly of
the carrier mechanism and the breech block is
moved towards the rear under the action of the
gas upon the piston I6. At the extreme end the
carrier mechanism comes into contact with the
element 3fL which is under the action of a spring.
The spring a then acts to drive back the assem
bly towards the front part while raising the car
tridge G and introducing the- same into the cham
ber of the barrel while at the same time closing
the breech. The carrier mechanism I comprises
a heavy portion b` which has the inclined sur
faces c and c1 acting upon correspondingly in
clined surfaces upon the breech block in order
to cause a bolting thereof during its forward
movement and an unlocking upon its rearward
movement.
While I have, in the above description, dis
closed what I deem to be practical and efficient
embodiments of the present invention, it should
be well understood that I do not Wish to be limit
ed thereto as there might be changes made in
the arrangement, disposition and form of the
45
50
55
60
65
70
parts without departing from the principle of
the present invention as comprehended within
the scope of the appended claims.
75
2,124,911
What I claim is:
1. An automatic firearm comprising a breech
block receiver, an action carrier movable in said
breech receiver, a barrel fixed to said breech
receiver, a barrel chamber for the cartridges,
a feed passage, a device for conveying the car
tridges from said passage to said chamber, said
device comprising a cartridge lifting carrier hav
ing pivoted thereto grippers and a cartridge sup
10 porting lever, said grippers having external
plane surfaces and internal bosses on said re
ceiver cooperating with said plane surfaces pre
venting spreading of said grippers on the for
ward stroke of said action carrier.
15
2. An automatic firearm comprising a breech
- -block receiver, an action carrier movable in said
breech receiver, a barrel fixed to said breech re
ceiver, a barrel chamber for the cartridges, a
feed passage, a device for conveying the car
tridges from said passage to said chamber, said
device comprising a cartridge lifting carrier hav
ing pivoted thereto grippers and a cartridge sup
porting lever, said cartridge lifting carrier hav
ing a shoulder, a spring engaging said shoulder
25 preventing downward movement of said lifting
carrier and means operative by said supporting
lever disengaging said spring and permitting
downward movement of said lifting carrier.
3. An automatic firearm comprising a breech
30 block receiver, an action carrier movable in said
breech receiver, a barrel fixed to said breech
receiver, a barrel chamber for the cartridges, a
feed passage, a device for conveying the car
tridges from said passage to said chamber, said
35 device comprising a cartridge lifting carrier hav
3
ing pivoted thereto grippers and a cartridge sup
porting lever, said cartridge lifting carrier hav
ing a shoulder, a spring engaging said shoulder
preventing downward movement of said lifting
carrier, a fixed abutment, a cam surface on said
lever cooperating with said spring to dísengage
the same from said shoulder upon contact of
said lever with said abutment, whereby said lift
ing carrier is disengaged from a cartridge and is
10
ready for a succeeding cartridge.
4. An automatic firearm comprising a breech
block receiver, an action carrier movable in said
breech receiver, a barrel fixed to said breech
receiver, a barrel chamber for the cartridges, a
feed passage, a device for conveying the car
tridges fromV said Ypassage to said chamber, said ,Y
device comprising a cartridge lifting carrier hav
ing pivoted thereto grippers and a cartridge sup
porting lever and a member pivoted to said lift
ing carrier serving to take the forward shocks to 20
said action carrier and also to lock said lifting
carrier in said breech receiver.
5. An automatic firearm comprising a breech
block receiver, an action carrier movable in said
breech receiver, a barrel ñxed to said breech re 25
ceiver, a barrel chamber for the cartridges, a
feed passage, a device for conveying the cartridges
from said passage to said chamber, said device
comprising a cartridge lifting carrier having piv
oted thereto grippers and a cartridge supporting 30
lever and a member pivoted and longitudinally
slidable to said lifting carrier serving to take the
forward shocks to said action carrier and also to
lock said lifting carrier in said breech receiver.
35
REGIS DARNE.
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