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Патент USA US2108060

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Feb. 15, 1938.
'5, @_ GREEN
Filed DeC. 9, .1936
E E( _` E
Samuel E_Er‘ean
refeptedreb. is, 193e' '
_ „2,108,060
' _
¿ A
Samuel G. Green, Gray, Ga..
Application December-9,1936, serial Np. 114,972
s Claims.-
(Granted under the _per of March s, 1883, as
amended April 3o, 192s; 33o o. 6.157);
bar is‘fspaced from the. lower end 'of the _back
'I'he invention described herein may be manu
factured and used by or for the Government for
plate ~which has 'a centrally positioned slot 20
_ « governmental purposes, without >the payment to
- for receiving and pivotally mounting the foot of
_ me of any royalty thereon. '
' a late_h 2 I. A nose 22 on the latch is adapted to
This invention relates to. a back plate latch
for machine guns.
engage» under the rear end _of the bottom Aplate
and-the latch is normally'held in latching posi
'I'he purpose of this invention is to provide a
back plate for the receiver of a machine gun
in which a latch -is conveniently mounted in the
lower end of -the plate and in order-_that the
tion by a. helical spring 23 which is seated‘in a
recess in the under side of the bar I 6 and in a well
24 formed in the body of the'latch. A toe 25
on the foot of the latch is adapted to engage the
latch may not be accidentally disengaged from ' `back plate and limit movement of the latch
_the receiver a locking member is mounted onv the under influence of the spring when the back plate`
back plate and is arranged to normally hold th
is out of -i_ts ;ñna1 assembled'position or is de-' latch in latching position.
vtached from the gun.
-To these and other ends, theinvention consists
in the construction,-arrangement and combina
The latch is held in engagement with the' bot 15
tom plate of the receiver by means of a locking
tion of elements described hereinafter and point- f.. member 26 which is -arranged to move in a plane
ed out in the claims forming a part of this speci
transversely- of the plane of movement _of the
latch.. Thev locking member is channeled to ,em-`
„Q_ A practical embodiment ofthe invention is il'-_ brace the bar I6 and it is mounted at its right
lustrated inthe accompanying drawing, wherein: end on a .pivot pin 21 passing through vthe bai’
Fig. 1 is a plan view of ‘the breech end of I6. A spring 28 bearing on the bar and anchored
in the locking member normally holds said mem
b'er against the bar in which position its lower'.
a machine gun.
Fig.- 2 is a view in lrear elevation.
Fig. 3 is a sectional view on theline 3-3 of
Fig. 2.
side engages the shoulder_29 of the latch. 'I'he
lower- _side of the locking member is formed with
._ Fig. 4 is a sectional view- on the line 3-3 _of _ a cut-away portion 30 to avoid interference with
Fig. 3?
the'helical spring 23.
In operation the locking member must iìrstbe. moved out _of engagement with the latch before Ú
' Fig. 5.
the latch can be movedout of engagement with
Fig. '7 is a view in rear elevation and partly in the bottom plate. As clearly shown in Fig. 2 both
section showing the application of the latch to the latch and locking member may be conveni
Fig. 5 isa plan view of the locking member. Fig. 6 is a sectional view-on the line 6_-6 of
another type of back plate.
Fig. 8 is a sectional view on the line 8-8 oi l
ently grasped by the thumb and foreñnger.
Fig. 7.
Referring to -Figs. 1 to 6 there is ‘shown a ma-.
chine gun ofthe Browning type comprising a
back plate 3| is of a type particularly designed
. In the modification shown in Figs. 'l' and 8 the
for a. iixed gun and is not provided with a trigger
and handle grips while 'the buiïer 32 is arranged
vertically in the back plate. 'I‘he latch 33 is sub
receiver formed of side plates 5 and 6, a bottom
40 plate 1 and' a top plate 8. The innerwalls of the
side plates 5 andy 6 are formed' adjacent their
rear ends with vertically disposed grooves, respec
stantially identical with the latch 2I and is ar- '
ranged in a similar manner. lvA locking member
34, vertically disposed in a slot 35 _in the backv
plate, is pivotally mounted` to move transversely
tively 9 and I0, for >receiving opposite tongues
II-'II on _a back plate I2 which is assembled-by
of the back plate and in a plane transversely oi'
the plane of .movement of the latch. A toe 36
45 a downward movement vand supported by_ the
bottom plate 1. The back plate carries a trig
ger I3 and a buiïer lI4 which is disposed longi
tudinally of the gun and serves in a Well known
on the lower end of the locking member is nor
mally in engagement with the latch 33 to hold _
the latter in latching position and the locking
manner to limit recoil movement of the breech , member is maintained in this position by a spring
50 bolt (not shown). _' An upper bar 'I5 and a lower
bar I6 on the back plate carry a pair of hand grips
cSo long as the latch is engaged by Ithe locking
’ member the 'latch cannot be accidentally dis
'I'he >lower bar I B is‘mounted in .two laterally "engaged as might occur when the breech end of
spaced sets of vertically spaced ears I8-I8 and the gun-is depressed and an obstruction such as _
55 secured thereto by bolts or rivets I9. The lower the knee of the gunner is struck b_y the latch,
' 2
I claim:
1. In a machine gun, a receiver, a back plate
slidably mounted in- the receiver by a lowering
' movement, a bar onf the lower part of the back
receiver to hold the‘back plate in place, a spring
between _the bar and latch, a locking member
pivotally mounted on the bar and movable in a
plane transversely of the piane of movement of
the latch, and a. spring normally holding the
plate, a latch pivottally carried by _the back plate
underneath the bar and arranged to engage the locking member in engagement with the latch.
receiver to hold the back plate in place, a spring.
3. In a machine gun, ia receiver,` a back-I plate
between the bar and latch, a channeled locking slidably mounted in the receiver by a lowering
'member pivotallyf mounted on the b'ar and mov
movement, a latch carried in the lower part of
the back plate and arranged to engage the re 10
10 a‘ble in a plane transversely of the plane of move
ment of the latch,'and a spring normally holding ceiver to hold the back plate in place, and a lock
the locking membler in embracing relation with ing member carried by the back plate and mov
the bar and in engagement with the latch.
able in a .plane transversely of the plane of
2. In a machine gun, a receiver, a back plate movement of the latch to engage the latch, said
15 slidably mounted yin the receiver by’a lowering
latch and locking member mounted for move 15
movement, a bar on the lower part of the back ment towards each other on being disengaged.
plate, a latch pivotally carried by the back plate
~underneath the bar and arranged to engage the i
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