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Патент USA US2125892

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Aug. 9, 1938.
A. DABRASKY
2,125,892
GUN
Filed Feb. 4, 2.955
2 Sheets-Sheet 1
Aug. 9, 1938.
A. DABRASKY
2,125,892 Y
GUN
Filed Feb. 4, 1933
2 Sheets-Sheet` 2
Inventur
Aucfustllahrasky
Attm-ney
Patented Aug. 9, 1938
UNITED STATES
rarest orties
2,125,892
‘
n
‘
GUN
August Dabrasky, Washington, D. C., assigner to
the Government of the United States of Amer
ica, as represented by the Secretary of War
Application February 4, 1938, Serial No. 188,683
"
'
6
(jaime.V
(c1.
ssi-_37)
'
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 370 0. G. 757)
The invention described herein may be manu
factured and used by or for the Government for
governmental purposes, without the payment to
me of any royalty thereon.
5This invention relates to a gun.
Because high speed aircraft is within the range
of an antiaircraft gun for only a short period of
time it is necessary to develop a high rate of ñre
to increase the probability of hitting the target.
10 With a modern 3 inch antiaircraft gun it is
possible to load and fire at the rate of forty
rounds per minute but the gun barrel becomes
overheated and due to expansion of the metal
its movement in the cradle during recoil and
15 counterrecoil is interfered with and frequently
prevented.
The purpose of this invention is to provide a
gun barrel mounting which will allow for radial
and longitudinal expansion of the barrel and
20 which will enable the barrel to be cooled sui
ñciently to insure its reciprocation in the cradle
while maintaining a maximum rate of fire.
A further object is to provide a mounting which
will facilitate the rapid and convenient removal
25 and replacement of the gun barrel.
To these and other ends, the invention con
sists in the construction, arrangement and com
bination of elements described hereinafter and
pointed out in the claims forming a part of this
30 speciñcation.
A practical embodiment of the invention is il
lustrated in the accompanying drawings, wherein:
Fig. 1 is a plan View, partly in section, of a gun
constructed in accordance with the invention.
35
Fig. 2 is a view in side elevation with the cradle
in section.
Figs. 3 and 4 are views, respectively in side ele
vation and in plan of one of the rails.
Fig. 5 is a sectional view on the line 5--5 of
40 Fig. 1.
Fig. 6 is a sectional view on the line 6_6 of
Fig. 5.
Figs. 7 and 8 are sectional views on the cor
45
responding lines of Fig. 3.
Referring to the drawings by characters of ref
erence there is shown a cradle 5 which is pro
vided with trunnions 6 whereby it is mounted in
a carriage (not shown) for movement in eleva
tion. The lower portion of the cradle which car
50 ries the recoil and counterrecoil mechanism has
been omitted. The cradle includes a pair of
spaced, forwardly extending arms 'I--'I whose low
er sides are connected by a thin ribbed plate 8
to afford rigidity. The forward portion of the
55 plate is formed with a plurality of openings 9
which in addition to reducing the weight serves
to permit free circulation of air. The front ex
tremities of the arms are further strengthened
by an’overhead arcuate plate I0. The inner sides
of the arms are each provided with a groove I I.
The gun which is to be mounted on the cradle
comprises a breech ring I2 and a barrel i3 whose
rear end has an interrupted thread connection I4
with the breech ring. A pair of similar rails
iti-«55, each including wearing strips I6, are se
cured to the opposite sides of the breech ring by
means of screws I'I and each rail has a lug I8
engageable in a recess in the breech ring. The
rails are slidably mounted in the grooves Il of
the cradle arm ‘I and extend some distance in 15
front of the arms to allow for movement of the
gun in recoil.
A supporting ring I9 disposed between the
rails near their front ends and forwardly of the
cradle arms 'I is formed with a pair of aligned
lugs Ztl-20 each of which is received in a recess
2| in the corresponding rail and secured by screws
22. The internal surface 23 of the ring I9 is rear
wardly tapered (Fig. 6) and supports an expan
sion ring 24 having a correspondingly tapered eX~ 25
ternal surface 25. The rear portion of the eX
pansion ring is formed with internal threads 25
which engage threads 21 on the gun barrel and
it is held in place by a set screw 28. A plurality
of arcuate grooves 29-29 are cut in the front 30
and rear faces of the expansion ring.
By reference to Fig. 1 it will be noted that the
internal diameter of the supporting ring I9 is
greater than the external diameter of all portions
of the barrel in rear thereof so that it is possible
to move the barrel through the supporting ring.
This construction facilitates the removal and re
placement of barrels without disturbing the breech
ring I2 and the rails I5 and the connections of
the breech ring to the recoil and counterrecoil 40
mechanisms (not shown).
Since the rails I5 and the cradle arms ‘I are
spaced an appreciable distance from the gun
barrel I3 they do not become overheated during
ñring and prevent movement of the gun. The 45
front support of the gun barrel is at about its
center, well forwardly of the cradle arms, and the
expansion ring is specially designed to minimize
heat conduction.
Radial and longitudinal expansion of the gun
barrel will be taken care of by the expansion ring
2'4 and its mounting in the supporting ring.
I claim:
1. In a gun, a cradle including a pair of arms
each having a groove on its inner side, a breech 55
2
2,125,892
ring within the cradle, a pair of rails on the
breech ring slidably mounted in the grooves of
the cradle arms and extend-ing forwardly of said
arms, a gun barrel detachably connected to the
10
by the rails forwardly of the cradle and having
a rearwardly tapered internal surface, and- an ex
pansion ring carried by the gun barrel and hav
ing a rearwardly tapered external surface fitting
breech ring and. spaced from the rails, a sup«
porting ring carried by the rails and disposed for
in the supporting ring.
wardly of the cradle arms, said ring having a
rearwardly tapered internal surface, and an ex
pair` of rails slidably mounted in the cradle, a
gun barrel connected to the breech ring and
spaced from the rails, a supporting ring carried
by the rails forwardly of the cradle and an ex 10
pansion ring carried by the gun barrel and fitting
pansion ring carried by the gun barrel and having»,
a rearwardly tapered external surface fitting in
the supporting ring, the front and rear faces of-LÍÍ
the expansion ring provided with arcuate grooves.
2. In a gun, a cradle including» a pair ofi arms
each having a groove on its inner side, abreech
15 ring within the cradle, a pair of rails on the
breech ring slidably mounted. in the grooves> of'
the cradle arms and extending forwardly of: said.
arms, a gun barrel connected to the breech ring
and spaced from the rails, a supportingringïcar
20 ried by the rails and disposed forwardly of-- the>
cradle arms, said ring having aA rearwardly ta
pered internal surface, and- _an-> expansion. ring
carriedk by the gun barrel and having a rear
wardly tapered external surface iìttingk in the
supporting ring.
3. In a gun, a cradle,` a breech-ring> having a
pair of rails slidably mountedA in the cradle, a
gun barrel connected to the: breech ring and
spaced from the rails, a supporting ring carried
4. In a gun, a cradle, a breech ring having a
in thesupporting ring.
5. Ina gun, a cradle, a breech ring having a
pair of rails slidably mounted in the cradle, a
gun barrel connected to the breech ring and 15
spaced from the-rails; a supporting ring carried
the Yrails and an expansion ring carried by the
gun barrel and fitting in the supporting ring.
6I In a'gun, a cradle, a breech ring having a
pair of rails slidably mounted in the cradle, a 20
gun barrel detachably connected to the breech
ring, a supporting ring carried by the rails and
having an internal diameter greater than the ex
ternal diameter of the gun barrell whereby the
barrel is movable through said ring, and a` ring 25
carried» by the barrel and disposed in the sup
porting ring.
AUGUST DABRASKY.
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