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Патент USA US3021771

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Feb. 20, 1962
Filed Jan. 20, 1960
2 Sheets-Sheet 1
Feb. 20, 1962
3,021,761 .
Filed Jan. 20, 1960
2 Sheets-Sheet 2
A Tron/vers
Patented Feb. 20, 1362
shown in FIG. 1, with the elevating mass of the gun
in one elevational position;
Follie Gustav Tillander, Before, Sweden, assigner to
Aktieboiaget Bofors, Bofors, Sweden, a corporation of
Filed Jan. 20, 1960, Ser. No. 3,606
Claims priority, application Sweden Ian. 31, 1959
5 Claims. (Cl. 89-33)
This invention relates to an ammunition guide for belt
fed elevating guns in which the rounds are fed from a
stationary magazine part vthrough a channel in a trunnion
carried upon an elevating part of the gun. The gun it
self should be visualized as being of conventional design
having a gun barrel which can bef'elevated or depressed
by means of trunnions journalled in a gun mountl and
is fed from a magazine.
During the firing of such elevating type gun, the am
munition belt tends to twist according to thepivotal
FIG. 3 is a view similar to FIG. 2, with the elevat
ing mass of the gun in another elevational position; and
FIG. 4 is a perspective view, partially cut away, to
show ammunition fed from a magazine to the trunnion
shown in FIG. l.
Referring now to the drawing, an elevating gun em
bodying an ammunition guide made in accordance with
the present invention is shown to include a breech cas
ing 1 having a trunnion 2 rotatably supported upon a
stationary mount 3 which also supports an ammunition
magazine (not shown) thereupon. Thus, the breech cas
ing 1 forms part of the elevating mass'of the gun and
is rotatable about a substantially horizontal axis with
respect to the stationary mount 3, from which ammu
nition fromV the magazine is fed to the breech casing.
l lThe trunnion 2 has one end adjacent to the elevating
mass of the firearm and an opposite end adjacent to the
movements of'ithe elevating mass in reference to the sta 20 stationary mount. The trunnion is formed with a pas
sageway extending longitudinally through the opposite
tionary parts of the gun, thus making it necessary to
ends thereof. This passageway, at its end close to the
guide the belt for proper feeding into the breech of the
trunnion defines an oblong opening 4 which has a longi
gun barrel. Various devices have been'proposed for
tudinal axis extending parallel to Vthe ramming direction
this purpose, such as employing a plurality of pins ar
ranged in parallel with each other in two rows spaced 25 of the gun barrel, vsuch opening restricting the passage
of ammunition therethrough to belts of rounds, the longi
apart a distance corresponding to the diameter of the
tudinal axes of which are substantially parallel to the
rounds. In such an arrangement, the pins have been ro
ramming direction for the gun barrel. kThe passageway
tatably fastened by their ends to the elevating mass of
through the trunnion widens from the oblong opening 4
the gun, as well as to the magazine, thus resulting in a
number of moving parts of complicated design. It is,
therefore, an object of the present invention to provide
an ammunition guide for elevating type guns which is
extremely simple in construction, efficient in operation,
and which will overcome the aforementioned didicuties.
Another object of the present invention is to provide
an ammunition guide for elevating guns of the type de
scribed in which a trunnion integral with the elevated
mass of the gun is provided with a passageway through
which an ammunition belt is fed and which orientates
the ammunition carried thereby into the direction for
ramming into the breech of the gun in any position of
adjacent to the one end of the trunnion toward the op
posite end thereof into a recess forming two diametrically
oppositely disposed ninety degree arc segments. These
segmental openings are defined by the adjacent sides 5,
6. 7, S, respectively, of a pair of diametrically oppositely
disposed blocks 9, 10.
It will be noted that the angles between the respective
sides 5, 7; 6, S of the blocks 9, 10 increase gradually
from approximately ninety degree at the magazine end
of the trunnion to 180° adjacent to the breech end of
the trunnion, at which point they define the parallel sides
of the oblong opening 4. Thus, regardless of the ini
the elevational mass of the gun relative to the stationary
tial position of the ammunition as it is drawn into the
magazine thereof.
outer end of the trunnion, the cooperating sides S, 6;
7, 8 of the blocks defining the passageway at the op
posite outer end of the trunnion, will orientate each
round of ammunition as it is moved toward the inner
one end of the trunnion and allowed to pass into the
In accordance with the present invention, a trunnion
carried by the elevating mass of the gun is provided
with a channel or passageway extending longitudinally
therethrough that is defined by walls formed by gen
eratrices having a direction approximately parallel with
breech casing 1 through the oblong opening 4 that is
the elevation axis, which generatrices on the side of the 50 in alignment with the ramming direction for the gun
trunnion directed toward the elevating mass of the gun
With reference now to FIGS. 2, 3 and 4 of the draw
follow an yoblong groove, which passageway allows the
vpassage of rounds therethrough only when the longitudinal
ing, it will be recognized that while the position of the
ammunition carried by the belt into the outer end of the
axes of such rounds are parallel with the ramming di
rection of the gun. The generatrices on the external 55 trunnion is substantially the same, whether the gun barrel
is in the horizontal firing position shown in FIG. 2 or
side of the trunnion adjacent to the stationary maga
in the vertical firing position shown in FIG. 3, or any
zine of the gun following a recess have the general form
position intermediate thereof, each such round of am
of two diametricallyY oppositely disposed ninety degree
munition 13 will be properly orientated into the ramming
arc segments which will accept rounds of ammunition
direction for the gun barrel as it is passed through the
therein in any angular direction with respect to the ram 60 oblong opening 4 adjacent to the inner one end of the
ming direction of the gun for guided movement toward
trunnion. In any firing position of the gun barrel be
the oblong opening adjacent to the breech of the firearm.
tween zero degree and forty-five degrees relative to the
All of the foregoing and still further objects and ad
horizontal, one par of surfaces 5, 8 will orientate the
vantages of this invention will become apparent from a
round 13 into the ramming direction of the ñrearm,
study of the' following specification, taken in connection 65 whereas in firing positions of the gun barrel between
with the accompanying drawings, wherein:
forty-five and ninety degrees with respect to the horizon
FIG. l is a perspective view, with parts broken away,
tal, the other guide surfaces 6, 7 will guide the ammuni
of a trunnion of an elevating type gun having an ammu
tion into the proper position, each such situation being il
nition guide made in accordance with the present inven 70 lustrated in FIGS. 2 and 3 of the drawing, respectively.
While this invention has been described with particu
FIG. 2 is a rightend elevational view of the trunnion
lar reference to the construction shown in the drawing,
and said outwardly iiared portion of said passageway isv
gradually conformed to the shape of said oblong opening
inwardly of said trunnion from said opposite end thereof,
whereby ammunition entering said flared portion of said
passageway out of parallelism with the ramrning direc
tion of the gun is gradually orientated> into parallelism
.with said" ramming direction vduringv movement throughk
it is to be understood that such is not to be construed
as imparting limitations upon theinvention, which is best
defined by the claims appended hereto.
Having thus described my invention,¿l claim as new
and desi‘re- toisecure by Letters Patent:
1. In a belt-fed elevating gun havingfa‘stationary maga-4
zineV and an elevating mass including a breech, an arn
rnunition guide comprisingV a trunnion secured to said.A
reech for rotation about a substantial` horizontal eleva
tional axis` relative to said stationary magazine, said
wherein the end of said trunnion adjacent the stationary
trunnion having one end adjacent to said breech.` and an~
magazine includes a pair of diametrically oppositely ar»
other` end adjacent toy said: stationary< magazine and in
ranged blocks each having a pair of angularly related
surfaces, adjacent surfaces of said vblocks deiiniug a pair
oi?` diametrically' disposed, oppositely extendingl grooves `
said passageway.
4. In a belt-fed elevating gun as set forth in claim l,
cluding a passageway extending longitudinally through
said trunnion adaptedf to receive ammunition fed from
sageway having a wide entry opening at the end` of the
through` said trunnion in alignment with the opposite ends
of said oblong opening», and the` angle defined by said
surfaces of each block increasing inwardly from said
trunnion adjacent the magazine and narrowing toward
f end‘to 180° to deñne each; of the` lateral'` sides of said
said magazine and means‘disposed: in said passageway and'
comprising lcooperating opposing surfaces defining» a pas
oblongV opening attsaid one end of said trunnion.
the end‘of‘the passagewayk at the breech side, said passageyway` being adaptedA to receive ammunition in various an
gular positionsçwith referencexto the' passageway entry
and to orient ammunition in the passageway in corre
5. In a belt-fed elevating gunl as set forth in claim 4,
wherein said sides of each said block and said endl of"
v said trunnion adjacentto the stationary magazine define
spondencewith the> ramming direction` of the breech.
2. In arbeit-fed elevating gun asset forth in claim 1,
an angle of substantially 90°,
References Cited inthe ‘die of this patent
wherein said passageway- at said one end of saidI trunnionv 25
adjacent to saidy breech defines an oblong opening haw
v ing a longitudinal axisr extending parallel to the ramming y
direction for said breech.
3. In a belt-fed, elevating gun asset forth in claim 2,
wherein said passageway at the end of saidtrunnion ad 30
jacent to said stationary magazine is flared outwardly,r
f 2,300,602
Trotter et ai. „; _______ __ Nov; 3, 1942
Vickers _____________ „_ May «17, 1960
France ______ _„„_„___,__ oct; 14, 1957
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