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Патент USA US2121030

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June 21; 1938.
Filed Dec. 18, 1956
7 /0///2
Invent or‘
E-amual 13-511211
Patented June 21, 1938
Samuel G. Green, Gray, Ga.
Application December 18, 1936, Serial No. 116,551
1 Claim.
(Cl. 89-44)
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 370 0. G. 757)
II. A packing I2 is held against the ring II by
The invention described herein may be manu
factured and used by or for the Government for an elongated gland l3 which is inserted into the
governmental purposes, without the payment to passage from the front end of the trunnion block
and is threaded to a tubular extension M of the
me of any royalty thereon.
This invention relates to a gland adjusting block. When the gun is completely assembled the
front end of the gland is disposed within a
jacket l5 which is threaded on the extension. l4
In a water cooled machine gun having a recoil
ing barrel it is necessary to provide packing for and contains a ?uid for cooling the gun barrel.
An annular row of teeth I6 is formed on the
the movable joints in order to prevent leakage of
10 the cooling medium which is contained in a outer surface of the gland adjacent its rear end 10
jacket surrounding the barrel. In the Browning and when the gland is threaded in the block to
type of machine gun the packing for the breech con?ne the packing I2, the teeth are generally
end of the barrel is held in place by a gland that in line with an aperture l‘! in the under side of
can only be adjusted after removing the water the block. This aperture leads into a longi
tudinally extending slot l8 in the under side of
15 jacket.
The purpose of this invention is to arrange the the block. A spring detent 19 carried by the block
extends through the aperture l1 and engages the
barrel mounting so that the gland which is posi
teeth on the gland to lock the gland in position
tioned internally of the assembly may be ad
of adjustment.
justed from an external position.
When it is desired to rotate the gland to vary
A further object is to provide a simple and em
cient means for locking the gland in adjusted the compression of the packing the detent I9 is
moved out of locking engagement with the teeth,
To these and other ends, the invention consists and a tool, such as a screw driver, is inserted
through the aperture, brought into engagement
in the construction, arrangement and combina
25 tion of elements described hereinafter and pointed with the teeth, and then moved tangentially of
the gland to impart rotational movement to the
out in the claimv forming a part of this speci?ca
gland and regulate the compression of the pack
ing l2.
A' practical embodiment of the invention is il
lustrated in the accompanying drawing, wherein: _ In the modi?cation shown in Fig. 4 the gear
teeth 20 on the gland 2| are engaged by a pinion 0
Fig. l is a longitudinal sectional View of a por
tion of a machine gun showing the gland and 22 which is mounted on a shaft or pin 23 carried
gland locking means.
by the trunnion block 24. The pinion is held
Fig. 2 is a view in elevation and partly in sec
against rotation by a spring detent 25 similar to
tion of the gland.
that shown in Fig.1.
Fig. 3 is a sectional view on the line 3—3 of
I claim:
Fig. 1.
Fig. 4 is a longitudial sectional view of a modi
?ed form of the invention; and
Fig. 5 is a sectional view on the line 5—5 of
49 Fig. 4.
The machine gun illustrated in the drawing is
of the Browning type and comprises a receiver 5
having in its front end a trunnion block 6 formed
with a passage 1 for receiving a gun barrel whose
45 breech end is slidably supported in the bearing
portion 9 of the block. This arrangement is simi
lar to a cylinder and piston construction.
The passage forwardly of the bearing portion
9 is enlarged and spaced from the barrel and
50 forms an annular shoulder 10 for seating a ring
In a gun, a receiver having a bearing, a jacket
for a cooling liquid on the front of the receiver, a
gun barrel slidably supported in the bearing of
the receiver and extending forwardly through the
jacket, a packing between the barrel and receiver as
and positioned forwardly of the bearing to estab
lish a liquid seal, a gland threaded in the receiver
to establish a liquid seal and extending rearwardly
to con?ne the packing, teeth on the outer side
of the gland adjacent its rear end, and said re as
ceiver formed with an aperture giving access to
the teeth of the gland from the exterior of the
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