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Dec. ' 3, 1946.
J, c, TROTTER
2,412,109
GUN AND SIGHT MOUNTING
Filed Dec. 5, 1945
3 Sheets-Sheet. 1
INVENTOR
‘
,
John
TroH'er
ATTO R N EYS
‘
'
Dec. 3, 1946.
-
' J, C TROT‘T‘ER'
-
, 2,412,109
GUN AND SIGHT MOUNTING
Filed Deb. 5, 1943
‘
‘
3 Sheets-Sheet
Fig. Z.v
55
'
I20
62
59
42
62
lNVéNTOR
15x2
John B9. TroHer ‘Y _
ATTO RN EY$
2Al2,109
Patented Dec. 3, 1946
ATENT
* * UNITED‘ STATES
OFFICE: ._ -.
2,412,109
GUN AND SIGHT MOUNTING
John C. Trotter, Burlington, Vt, assignor to Bell
Aircraft Corporation, Buifalo, N. Y.
Application December 3, 1943, Serial No. 512,754
4 Claims.
1 .
‘ VThis invention relates to ordnance, and more -
particularly to gun mounts and associated ammu
nition feed arrangements.
‘
-
One of the objects of the invention is to pro
vide a new and improved plural gun mount ar
rangement permitting relatively wide range ad
justments of the gun battery aim both in eleva
tion and in azimuth. Another object of the
(Cl. 89-375)
2
-'
whereby the bracket l4 projects therefrom to
support the gun battery as an independent unit
exteriorly of the mounting vehicle and in closely
connected and generally streamlined relation
therewith. An upper bracket l6 (Fig. 1) is also
provided to be ?rmly attached to a. correspond
ingly positioned framing portion I8 of the mount
ing vehicle structure.
‘
A central post‘ 20 extending between the lower
invention is to provide agun'mount arrangement
of the character described ‘which is of improved 10 and upper brackets l4—l6 is mounted thereon
compactness and structural ruggedness, and so
constructed as to be adapted to maintain the
by means of bearing connections at 22-24,
whereby the post 20 is supported upon‘tne mount
ing vehicle in a vertical attitude and centrally
guns in “steady” supported relation despite the
of the gun battery position andso as to be freely
relatively wide angles of permissible gun aim
adjustment range. Another object of the inven 15 rotatable about the vertically aligned axes of the
bearings 22—24, Intermediately of its length the
tion is to provide a gun mount device of the char
post 20 is laterally enlarged as indicated at 26
acter described which is adapted to be assembled
and transversely flattened to provide a rigid gun
as a single compact unit which is suitable to be
mount post 'of minimum thickness transversely
attached to a carrying vehicle or the like and
detached therefrom for servicing purposes with 20 of the gun direction. The post 20 is recessed as
indicated at 28 to accommodate in nested relation
improved facility. Another object of the inven
therein the outer case of a vane piston type hy
tion is to provide an improved gun battery ar
draulic motor as indicated at 30; the motor case
rangement of the character described which also
30 being of a thickness dimension generally’equal
embodies improved ammunition storage and feed
ing means, whereby a relatively large supply of 25 to that of the post 20 and being segmentally
shaped in side view with the apex portion thereof
‘ammunition may be stored in conjunction with
occupying the region of the center of rotation of
the guns of ‘the battery and feed thereto without
the gun battery for elevational aim adjustment
assistance from an ammunition feed booster
purposes.
'
‘device or the like. Other objects and advantages
of the invention, will appear in the speci?cation 30 The piston of the motor case 30 is keyed to a
cross shaft 32 (Figs. 1 and 2) which extends at
its opposite ends exteriorly of the motor case and
In the'drawings:
thence downwardly to form in effect a pair of
Fig. 1 is a side elevation of a gun mount and
opposite stirrup arms 34-34 which ?xedly jen
ammunition magazine arrangement of the inven
tion, shown in conjunction with a “twin” ar 35 gage upon corresponding inner rod members
rangement of machinevguns and carried at the
'36—-36 of a gun mount frame which is designated
generally at 40. The gun mount frame 40 com
nose or tail portion of an aircraft or other vehicle
prises a group of four rods arranged in parallel
or the like;
'
relation ‘and comprising a pair of outer rods
' Fig. 2 is a top plan of the gun mount and mag
42—42 in addition to the inner rods 38-46. The
azine arrangement of Fig. 1; '
hereinafter.
-
'
Fig.‘ 3 is an end view thereof; and
P
Fig. 4 is‘an enlarged vertical section of the
'aim sight ‘mechanism.
'
’ rods 36-4Z are interconnected at their front
and rear ends respectively by‘ cross brackets
44-46, to provide an integral frame-like struc
ture. The guns Hl—'-l0 are carried by the gun
In the drawings the invention is illustrated
in the form of a gun mount and ammunition 45 mount frame structure 40 by ‘means of separate
magazine arrangement in conjunction with a pair E slide ‘brackets 48-49 extending from rear and
front end portions of the guns; the brackets
of "twin” guns of the conventional machine gun
48-49 being slidably mounted upon correspond
type as ‘are illustrated at ‘l0—l0; the gun battery
ing pairs of thelrods 36—42. Hence, the guns
being shown mounted uponthe nose 'or tail end
portion of an aircraft or other vehicle body as 50 are independently reciprocable relative to the
indicated at H. ‘The gun mount structure is ' frame M in directions longitudinally of the guns
for recoil shock absorbing purposes. Hydraulic
shown ‘as'comprising a lower bracket l4 arranged
pneumatic shock absorber devices, as indicated
tobe 'deta'chablyconnected to and toy extend rig
at 50, are connected between movable bracket
idly from anyrsuitable', framing structure of the
vehicle, such as is‘indicated at l5 of Fig. 1, 55 and ?xed bracket portions of each gun mount
ll)
#112,109
4
arrangement to cushion the shocks of the gun
recoil forces and to provide counter-recoil move
ments of the guns.
frame 40 and the center post 20 to control, re-'
Thus, it will be understood that the guns
a suitable motor driven hydraulic pump device
may ‘be mounted upon the vehicle I2 and ar
ranged to be controlled by a valve mechanism
‘I6 which is manually operable by a control
spectively, the elevational and azimuth aim posi
tions of the gun battery. As indicated at ‘I5,
l0—I0 are carried upon the frame M] in such
manner as to be individually reciprocable rel
ative to the frame in connection with their re~
spective recoil and counter-recoil movements,
whereby the frame will [be relieved of Violent
handle TI arranged within convenient reach of
the gun operator. The pump device ‘I5 will be
recoil forces such as are usually imposed upon 10 connected to the motor devices 30-40 by suit
a gun carriage. The frame is rotatably mounted
able hydraulic conduits, as is well known in the
by means of the cross shaft 32 upon the motor
hydraulic motor art; and thus it Will be ap
case 30 which is ?xed to the center post 20,
preciated that through manipulations of the
whereby the gun battery is freely rotatable about
control handle T1 the gunner will have full
the horizontal axis of the shaft 32 for gun ‘eleva 15 selective control of the motors 30—‘I0 so as to
tional aiming purposes, while the center post 20
operate the latter to selectively adjust the gun
is freely rotatable about its vertical a‘xisfor azi;
battery aim' both in elevation and in azimuth
muth adjustments of the gun battery aim.
at will.
Disposed at each side of the gun battery, and
A gun sight device as indicated at 80 may
aligned generally parallel to a respective one
be conveniently arranged in conjunction with
oftheguns 10+“) is mounted an ammunition
the gun battery and may be mounted by means
magazine 55. The magazines 55-7-55 are alike
of a bracket 8I carried by a shaft 82 extending
and are of drum-like formation and are mounted
transversely of the upper end of a gun sight
to'rrermainatrall times parallel to the'guns and
frame 83 which pivots at its lower end upon a
to ‘rotate therewith in connection with both azi 25 cross shaft 84. The shaft84 is carried by a yoke
muth‘ and elevational, aim adjustments of the
85 which is in turn pivotally mounted in a ver
guns. To this end a frame comprismg alovver
tical bearing ‘86 supported by the stationary
cross bar 56; an upper cross bar 58; side mem
structure I8 of the mounting vehicle. Thus, the
bers 59 and interior vertical members 60'—'6'0 are
entire sight mount is rotatable about the axis
provided to carryv bearing devices at B2 to sup 30 of the bearing 86 forazimuth aim adjustments,
port stub shaft members extending from op
and the upper portion of said gun sight frame
posite sides ‘of the magazine drums 55—55.
portion 83 and thesight-carrying- bracket Bl are
Thus, theframe carries the drums to rotate with
both rotatable upon horizontal axes for eleva
' the gun battery in connection with azimuth ad
tional aim adjustments.
justments thereof, While at ‘thesame time the
The yoke 85 carries a sprocket 81 which is
drumsare free to rotate with the guns relative
geared by means of a suitable endless chain
to the frame work in connection With eleva
or the like to a corresponding sprocket 88 car- _
tional aim adjustments of the gun battery.
ried by the upper end of the post 20, whereby
rotation of the post ‘20 upon the bearings 22-24
will cause the sprocket 8'!- to turn the sight
carrying yoke 85 for adjustments of the sight aim
suitableelinks extending between the gun mount
frame 40 and the magazine dru'ms‘55-55 syn
chronize rotations thereof in connection with the
elevational aim adjustments of the gun battery.
in consonance with azimuth adjustments of the
aim of the gun battery. A vertical shaft 89
is carried within the upper portion of the post
20 and carries at its lower end a bevel gear 90
and at its upper end a sprocket 9|. The bevel
The magazines 55-55 are formed with am
munition belt outlet ports 654455 at the top por-v
tions of the magazines; and rollers Bt—66 are
carriedby each magazine adjacent the outlet port
thereof'to smoothly guide the training of belted
gear 90 is geared to a crank arm 92 which eX
ammunition therefrom into the ammunition
feedway portions of the associated guns. Thus,
tends from the gun mount frame 40 eccentrically
of the horizontal» axis of rotation thereof by
it will be understood that ammunition belts may _
means of a gear 93; a strut 94; and an arm 96.
be compactly nested interi'orly of the magazines
An endless chain or the like interconnects‘ the
sprocket 9i and a sprocket I00 (-Fig. 4) carried
through the outlet ports 56-56 into the closely
by a shaft I02 within the yoke 85 and con
positioned ammunition feedway mechanisms of
centrically of the bearing 80. The shaft I02
the associated guns. It will be appreciated that 55 carries a bevel gear I03 which meshes with a
so as to fill the latter and to train therefrom
due to the fact that the ammunition supply for
each gun is compactly nested in the region of
the horizontal axis of the gun battery and close
to gun ammunition feedways, the pull forces
required to feed the ammunition to the guns 60
are always at a minimum, and that the directions
of twisting of the ammunition belts ‘While feeding
the guns remain the same atlall times.
gear I04 whichis keyed to the sight frame 83
by bolts I05. A spur gear segment I06 is
mounted concentrically of the shaft 84 and is
keyed to the yoke 85 as at I01, and the gun sight
frame 83 carries a ‘train of meshed ‘gears I08
I08 upon bearings. I'M-I09 which interconnect
the gear I06 and an oppositely disposed gear
I I0 carried by the top shaft 82 and keyed thereto
as at I I I. Thesha-ft 82 is‘ in turn keyed to the
A motor device is carried by the support -»
bracket I6, as indicated at ‘I0 (Fig; 1) and may 65 sight bracket 81 by means of "pins II2'_-II2;
conveniently comprise a second hydraulic motor
whereby it will be understood that movements
of the vane piston type as employed at 30. Thus,
of the gun carriage crank 92 will cause the bevel
the 7 motor‘ 10 will comprise an outer casing
gear and sprocket mechanism to rotate the frame
which is ?xed by the bracket l6 to be stationary
03 about the shaft 84.‘ This motion in turn
relative to the frame of the mounting vehicle,
causes the gear train I 08—l_08 to tilt the ‘gun
and the piston element of the motor ‘I0 will be
sight frame and to drive the sight bracket 8|
76
keyed to the ‘upper vend of the center post 20.
Hence, application of ?uid pressure forces at op
posite'sides of the pistons of the motors, 30-10
will procure corresponding oscillations of the gun
to- rotate relative ‘to the‘ frame 83, and the gear
and chain devices are so arranged as to provide
such total tilting’ movements of the sight 80
as to' maintain its line of sight at all times
2,412,109
parallel-to the vdirection of elevational aim of
thegl-m's? 1-
'
i "
-
means interconnecting said central post and said
frame for rotating the latter about its vertical
-In?_ this ‘manner it is arranged that the sight
tU‘will-shift' automatically both bodily and an
axis coincidentally with the rotations of said gun
mount carriage about the vertical axis of said
gularly relative to the position of the gunner’s
central post.~
head in connection with adjustments of the gun
‘
‘
‘
,
2. ‘In combination, a gun mount comprising a
gun carriage having dual guns mounted thereon
elevational aim whereby to require less strains.
in spaced parallel relation, a central post extend
and twistings of the gunner’s body and neck in
ing vertically between said guns and mounted
following the sight. Thus, it will be understood
that the'gun sight device 80 will rotate under all 10 upon a ?xed frame portion, said central post
supporting said carriage for rotation therewith
conditions of gun aim adjustment in synchronism
about a vertical axis for azimuthal aim adjust
with the gun battery movements, whereby the
ments of the gun carriage, a shaft mounting said
gunner may gain'from the sight 8%) an accurate
post to be rotatable about a horizontal axisifor
representation of the relation between the posi
elevational aim adjustments of the gun carriage,
tion of the target and the direction of gun battery
a gun sight unit comprising in combination a gun
ann.
sight, a ‘gun sight frame supporting said sight
It will be appreciated that the invention pro- 7
vides a gun mount device wherein the elevational
and'azimuth aim adjustment axes are disposed
whereby the latter is pivotable relative to said
frame about a'?rst-horizontal axis, a trunnion
at the outermost positions of the supporting 2.0 post mounted upon said frame portion at a'posi-_
tion substantially directly over the position of
said central post and to be rotatable about a ver
therefore maximum range of aim adjustments is
tical axis, said trunnion post pivotally engaging
available in all directions, while the gun mount
said frame whereby the latter is pivotable relative
supporting structure is of compact and struc
turally rugged form whereby to be adapted to .25 to said trunnion post about a second horizontal
axis offset from said ?rst horizontal axis, trans
maintain the mounted guns in “steady” sup
mission means interconnecting said trunnion post
ported relation. Hence, accuracy of gun ?re and
and said frame, second transmission means inter
ease of operation of the battery is assured. As
connecting said frame and said sight whereby
indicated at I28 a gun battery enclosure in the
form of a generally spherical wall structure may 30 pivotal movements of said frame relative to said
trunnion post operate said second means to drive
be conveniently carried by the magazine support
said sight to pivot relative to said frame, motion
ing frame work, and will thus cooperate with the
transmitting means connecting said gun carriage
adjacent wall structures of the mounting vehicle
bracket‘devices oflthekmounting vehicle, and that
to said frame for pivoting the latter about said
structure terminating in a hemispherical turret 35 second horizontal axis relative to said trunnion
to provide a smoothly faired or streamlined
portion protruding beyond the rearmost limit of
the mounting vehicle.
post coincidentally with the pivoting of said gun
Although only one form of the invention has
connecting said central post and said trunnion
carriage, and motion transmitting means inter
post for rotating the latter about its vertical axis
been shown and described in detail it will be ap
parent to those skilled in the art that the inven— 40 coincidentally with rotations of said gun carriage
about the vertical axis of said central post.
tion is not so limited but that various changes
3. In combination, a gun battery comprising a
may be made therein without departing from the
spirit of the invention or the scope of the ap
pended claims.
I claim:
gun mounted on a carriage, a central post mount
ed upon a ?xed frame portion, said central post
mounting said carriage and rotatable therewith
about a vertical axis for azimuthal aim adjust
ments of the gun carriage, a shaft mounting said
central post to be rotatable about a horizontal
?xed frame porition, said post mounting said car
axis for elevational aim adjustments of the gun
riage and rotatable therewith about a vertical
axis for azimuthal aim adjustments of the gun 50 mount, a gun sight unit comprising in combina
tion a bracket carrying a gun sight, a gun sight
carriage, a shaft mounted upon said post to be
frame supporting said bracket whereby the latter
rotatable about a horizontal axis for elevational
is pivotable relative to said frame about a ?rst
aim adjustments of the gun mount, a gun sight
horizontal axis, a trunnion post engaging said
unit comprising in combination, a bracket
1. In combination, a gun mount comprising a
gun carriage, a central post mounted upon a
adapted to carry a gun sight device, a gun sight ,
frame supporting said bracket whereby the latter
is pivotable relative to said frame about a ?rst
horizontal axis, a trunnion post mounted upon
frame whereby the latter is pivotable relative to
said trunnion post about a second horizontal axis
offset from said ?rst horizontal axis, gear means
interconnecting. said trunnion post and said
frame, second gear means interconnecting said
said frame portion to be rotatable about a vertical
axis and pivotally engaging said frame whereby 60 frame and said bracket whereby pivotal move
ments of said frame relative to said trunnion post
the latter is pivotable relative to said trunnion
operate said second gear means to drive said
post about a second horizontal axis o?set from
bracket to pivot relative to said frame, motion
said ?rst horizontal axis, gear means intercon
transmitting means connecting said gun carriage
necting said trunnion post and said frame, sec
ond gear means interconnecting said frame and 65 to said frame for pivoting the latter relative to
said trunnion post about said second horizontal
said bracket whereby pivotal movements of said
axis coincidentally with elevational pivoting of
frame relative to said trunnion post about said
said gun carriage, motion transmitting means in
second horizontal axis operate said second gear
terconnecting said central post and said trunnion
means to drive said bracket to pivot relative to
said frame about said ?rst horizontal axis, mo 70 post for rotating the latter about its vertical axis
coincidentally with rotations of said gun mount
tion transmitting means connecting said gun car
carriage about the vertical axis of said central
riage to said trunnion post for pivoting said
post, motor means for driving said carriage to
frame about said second horizontal axis coin
rotate relative to said central post and said cen
cidentally with the elevational aim adjustment of
said gun carriage, and motion transmitting 75 tral post to rotate relative to said frame portion,
7
2&1251109
'8
and control means for said motor means, carried
by said frame portion at position clear of the
Orbit of swing of Said gun battery and closely
adjacent thereto whereby an operator may peer
second horizontalaxis offset vfrornsaid ?rst heri
zontal axis, a trunnion post pivotally carried-bi!
said yoke and having its axis coincident with the
yoke axis, gear means interconnecting said trun
nion post and said frame, second gear means inj
terconnecting saidyoke and said bracket whereby
pivotal movements of said frame relative to said
trunnion post about said second horizontal axis
through said sight and manipulate said control
means while being positionedclear, of said battery.
4. In combination, a ‘gun mount comprising a
gun carriage, a central post mounted upon ‘a
?xed frame'portion, said post mounting said car
riage and rotatable therewith about a vertical
operate said second gear means to drive said
10
axis for azimuthal aim adjustments of the gun
carriage, a shaft mounted upon said post to' be
rotatable about a horizontal axis for elevational
aim adjustments of the gun mount‘, a ‘gun sight
unit comprising in combination, a bracket adapte
ed totcarry a gun sight device, a gun sight frame
supporting Said braqket whereby the latter is
pivotable relative to said vframeabout a ?rst‘hori
zontal axis, a yoke, carriedby said frame portion
and pivotable about a vertical axis, said frame
being, pivotally attached to said yoke about a
15
bracket to pivot relative to said frame about said
?rst horizontal axis, motion transmitting means
connecting said guncarriage to said trunnion
post for pivoting said frame about said second
horizontal axis coincidentally with the elevational
aim adjustment of said gun carriage, and motion
transmitting means interconnecting said central
post and said yoke ‘for rotating the latter about
its vertical axis coincidentally with the rotations
of said gun mount carriage about the vertical
20 axis of said central post.
' JOHN C. TROTTER.
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