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J NOV- 5, 1946.
J_ c, TROTTER
2,410,614
GUN MOUNT
Filed June 28, 1944
L46 .
W
3A
IN VEN TOR.
JOHN C. TROTTER
BY
when
Patented Nov. 5, 1946
l.~~=umrsn stares Parent OFFECE
GUN MOUNT
‘ John C. TrottenB‘urlington, Vt,, assignor to Bell
'
1
Aircraft Corporation ‘
Application June 28, 1944; Serial No. 542,499
3 Claims.
(Cl. 89—-37.5)
2
, adapted to be accurately adjusted with improved
This-invention relates to gun mounts, and more
particularly to ?xed-aim type mountings for
facility without the use of wrenches or other tools
aerial machine guns and cannon or the like.
orthelike. Another object of the invention is
Such gun mount devices customarily embody a
pair of gun connection units extending from the
airplane fuselageor wing or other frame struc
tureupon which the gun is to be mounted; said
to: provide a device of the character aforesaid
which is adapted to: bemanuallymanipulated by
gunserVice personnel with improved ease and
facility to provide micrometer-?ne vadjustments
of the mounted gun aim. Another object of the
connection units being relatively spaced in the
direction. of the longitudinal extent of the gun
invention is to provide a gun mount. device hav
and generally referred to asi-the front trunnion 10 ing the features hereinabove ‘recited and which
is self-locking atv all positions of adjustment
and. rear-trurmion, respectively.’ The front trun
thereof and requires no accessory locking means.
nion-‘unit is customarily provided in ‘the form of
ther objects and advantages .of the invention
aiswivel connection device whereby the gun- may
be rocked thereon about transverse axes for regu
latingv the aim of the gun relative to the support
will app?ar I in the (specification hereinafter.
15
ing frame. The rear trunnion unit customarily
comprises’ a laterally and vertically adjustable
linkage between the mounting-frame and the gun,
whereby to providefor pivoting of the gun upon
the ‘front ..mount device for aim adjustment 20
purposes.
>
.
In the drawing": ‘
_
I
I
Fig. 1 is an elevation of a gun mount'device of
the invention, with portionsshown'in/section; and
Fig‘. 215 a section taken along line II-II of
Fig.
1.
'
‘
.
.
Fig. ,3 is airagmenta'ry sectional view. of the
device taken along line IIL-III of Fig. 2. ‘_
1 For example, manufacturing tolerances which
aregnecessary in connection with large airplane
A gun mountdevice of. the invention i'SillllS".
trated 'infthe. drawing-in connection with the
productionprograms and varying tactical require
mounting-eta machine gun or cannon as indi
ments calling for different rates of plural gun ?re 25 cated at H] upon a frameelem'entvindicated 12.
convergences require that for such purposes must
It will .be understood that the frame member I2
embody. aim adjustment means for the guns rela
may beanyportion. of a framing structure, such
as interiorly of the fuselage or wing of'an air
tive to the airplane fuselage or wing structures,
as explained hereinabove. Prior art' arrange
plane, and it will also beunderstood that the gun
ments' for. providing the adjustability features. re
lil~~will be preferably arranged to be carriedat
ferred to hereinabove usually employ paired screw
thread ‘connection devices having transverse axes
forconnecting the ‘gun and support frame ele
ments, whereby screw adjustments thereof obtain
corresponding lateral and vertical adjustments
of vthe rear end portion of the gun relative. to the
supporting frame, whereby the gun aim is shifted
about the front trunnion, while keeping the gun
positions spaced longitudinally of the gun-by
means of a pair of mount connectiondevices,
whereby to rigidlymount the gun It upon the
frame. l2. At the relatively forward position the
connection device may comprise any suitable form
of swivelable mount; that is, a connection device
permittingthe. gun tobe rotated thereon about
substantially transverse horizontal and vertical
locked inmounted position. 'Such adjustments
axes for adjusting the gun aim‘ in azimuth and
of the screw threadconnection devices are, how 40 elevation relativeito the frame l2. Although the
present invention may be applied either- to the
eifenaccoinbli'shed through use of wrenches or
other tools thereon as in l5atent No. 2,076,256, for
front or the rear gun mount connection, it is
example, and it is usually extremely difficult to
shown in the. drawing herein to relate only to the
design the gun mount and airplane frame struc
rear gun mount connection; and in the interests
tures so as to inake adequate provision for room
of‘simplification of the specification onlyv the rear
sufficient-to allow quick and effective handling
gun mount'connection form of the inventionis
of wrenches or. the like in the regions of the screw
described in detail hereinafter.
devices referred to. Also, under such conditions
Thus, as illustrated, the gun mount of thein
it is extremely dii?cult to effect relatively minute
vention may comprise a mounting sleeve It which
and‘aocurateadjustments.of the screw devices. 50 is externally threaded to extend substantially
Itis a primary object of the present invention
to provide an improved aim~adjustable gun mount
device._.as an improvement over the Standard
Armyv Type A GunRear' 'I‘runnion, forexample,
vertically and in screw thread mounted relation
upon an internally threaded ferrule 16 carried
by the framegstructure I2. The upper. end of
the sleeve I4 is rotatably heldagainst a collar
andwhich-isjof rugged and compact formand its 18 by. means of a bolt 20, passing throughthe
2,410,614
3
4
sleeve I4 and provided with a head portion 22
I4 and is freely rotatable thereon and main-e
tained. against accidental displacement subse
which rests against the collar I8 so as to pull
downwardly thereon in reaction to the clamping
forces of a nut 24 which is screwed upon a stub
end portion 25 of the bolt 20 at the lower end
thereof. For convenience of manufacture the
quent to assembly of the device by means of a
spring washer 48. The ring 46 carries an up
standing shaft 50 which mounts in freely rotat
able relation a dual gear 52 having gear elements
in coaxial relation with each other and fastened
threaded stub end portion 26 may be separately
together 'for unison rotation.» The lower one of
fabricated and inserted within a suitably bored
the gear elements is of a slightly larger diam
portion of the bolt 20 and keyed thereto by means
eter than the upper gear element thereof. The
of a pin 28; and subsequent to ?nal assembly of
lower gear element meshes with a ring gear por
the sleeve and collar and bolt elements the nut
tion 55 of the sleeve l4, and the upper gear ele
24 may be locked upon the stub 26 by means of
ment meshes with a ring gear portion 56 of the
a cotter pin 29.
"
collar l8. Since the collar I8 is non-rotatably
A socket member 30 is arranged to embrace
the upper end of the bolt head 22, to be rotat 15 attached through the socket member 30 to the
trunnion bolt 34 whenever the connector device
able thereon,_ and the socket member 30 is formed
45 is in gun mounting condition, any manual ro
with an integral extending eye portion 3|; the
tation of the casing 44by gun servicing personnel
bore of the eye portion 3I being horizontally di
will cause the gear unit 52 to be rotated upon
rected transversely of the longitudinal axis of
the shaft 55 while being simultaneouslylcarried
the gun to be mounted. The eye portion 3| is
by the ring 48 to rotate with .a planetary motion
internally threaded to receive a trunnion unit in- ‘
about the vertical sleeve I 4. Such rotation of
eluding a bolt 34 which slip-?ts through paired
the gear unit about the shaft 53 causes the
lugs 35—35 extending downwardly from the gun
toothed portion 55 of the sleeve L4 to be simul-_
I!) and formed integral therewith to mount the
latter upon the upper end of the gun mount sleeve 25 taneously driven to rotate the sleeve about its
vertical axis, but the speed of rotation of the
I4. A key 36 is ?tted upon the bolt 34 between
sleeve I4 will be at greatly reduced rate com
the positions of the lugs 35-35 of the gun to key
pared to the speed of manual rotation of the
a sleeve 38 of externally threaded form to the
casing 44 because of the slight difference in di
bolt 34 subsequent to screwthreaded insertion
of the sleeve 38 within the eye portion 3|. Thus, 30 ameters of the upper and lower elements of the
gear unit 52. Thus, it will be appreciated that
it will be understood that the displacements in
the speed of rotation of the mounting sleeve I4
vertical directions of the post sleeve [4 relative
relative to the speed of manual rotation of the
to the mounting frame. I2 will either raise or
casing 44 will be governed by the difference be-v
lower the elevation of the trunnion bolt 34, and
tween the diameters of the elements of the gear
thus effect elevational adjustments of the gun
unit 52, and that this may be regulated to provide
aim relative to the frame I2.
any desired degree of rotational speed reduction.
The socket member 30 is arranged to be de
A pair of spring detents 60—60 are preferably
tachably connected to the bolt head 22 for quick
mounted to extend in cantilever fashion from
gun dismounting and remounting purposes and
to be held against axial movement therewith, 40 the base ring 46 to bear at their free ends against
the gear unit 52 to impose thereagainst rotation
when in gun mounting condition by any suitable
restraining in?uences, whereby to retard the
means. This may be accomplished through use
power supply unit against accidental rotation.
of a retaining ring 40 which encircles the socket
Thus, it will be understoodthat because of the
member and controls an interconnection device
speed reduction ratio which is provided by the
thereon. This feature of the mechanism is not
gear unit the casing 44 is adapted to be easily
a part of the present invention, however, as such
quick-disconnect devices are presently well known
rotated manually by only one hand of the oper
ator even though nearby portions of the gun
in the gun mount art, and may employ for exam
ple operative elements of the type shown and
and gun mount and frame support elements pro
vide only restricted room for insertion of the op
described in detail in Patent No. 1,939,699. The
erator’s hand into actuating position, and that
collar I8 is held against rotation relative to the
socket member 35 by means of a number of de
thereby the need for applying wrenches or other
tent lugs 32 carried by the collar and engaging
tools or the like to the control device is elimi
notches 33 formed in the lower edge of the socket
nated. Also, it will be appreciated that due to
member.
the rotational speed reduction feature of the con
trol unit extremely ?ne adjustments of the gun
To eifect gun aim adjusting vertical displace
mount sleeve [4 relative to the frame I2 can be
ments of the sleeve l4 relative to the frame l2
effected without difficulty by the operator.
to rotate relative to the frame, whereby the screw
As illustrated generally at 65, Fig. 1, an azi
thread devices thereof will cause the sleeve to (if) muth adjustment control device will Preferably
correspondingly rise or lower. Whereas to apply
be employed in conjunction with the trunnion
manual rotating forces directly to the sleeve I4
bolt 34 and the gun lugs 35-35; and the ad
it is of course onlynecessary to cause the sleeve
would require the use of a wrench or the like
and would inevitably result in relatively coarse
adjustments of the sleeve I4, the present inven
tion employs a novel power supply mechanism
which is adapted to be manually actuated to
translate manual movements thereof into mi
(ln‘ometer-?ne rotational movements of the sleeve
For example, as shown in the drawing, the
power supply mechanism may conveniently com
prise a casing 44 keyed ‘to a base ring 46 (as by
screws 41 shown in Fig. 2) which encircles a
shouldered portion of the upper end of the sleeve
justment control device 65 may comprise a‘unit
which is substantially identical to the control
unit enclosed within the casing 44. That is, the
control unit 65 may comprisea manually rotat
able casing 66 which is dual-geared internally
thereof to both the trunnion bolt 34 and a sleeve.
68 carried by a locknut ‘H! which is in turn'keyed
to one of the gun lugs 35. Thus, it will be un
derstood that manual rotation of the casing“
about the axis of the trunnion bolt 34 will cause
the gear unit internally of the control device 65
to react against the fixed gun lug andto cause;
the trunnion bolt 34 to rotate within the gun
2,410,614
5
lugs 35--35 at a greatly reduced speed relative
to the speed of rotation of the casing 66. Such
rotation of the trunnion bolt 34 will drive the
threaded sleeve 38 to rotate within the eye por
tion 3| of the gun mount post device, whereby
a corresponding screw threading displacement of
the gun l0 laterally of the mounting sleeve M
will occur to provide a micrometer-?ne adjust
ment of the gun aim in azimuth about the verti
cal axis of rotation of the front gun mount de
vice.
It will be appreciated that the gun aim adjust
ment mechanisms of the invention are ‘freely re
versible in the sense that they are readily rotated
6
sized pinions rigidly interconnected and carried
by said ring in positionally ?xed relation thereon,
said pinions meshing with the bolt means and
sleeve gear means respectively.
2. A gun support comprising in combination,
bolt means formed at one end to be connected
to a gun for support thereof, a sleeve rotatably
mounted upon said bolt means and formed with
external screw threads for screw threaded en
10 gagement upon a positionally ?xed frame, means
for retaining said bolt means and said sleeve
against axial displacements relative to each other,
a ring rotatably mounted upon said sleeve in
axially non-displaceable relation thereon, di?'er
in either direction by the operator to procure 15 entially sized gear means carried upon said sleeve
corresponding reverse-direction adjustments of
and said bolt means respectively, and a pair of
the gun aim; but that under all conditions of
differentially sized pinions rigidly interconnected
adjustment the mechanisms are inoperable to
and carried by said ring in positionally ?xed rela
permit changes in the gun aim in response to
tion thereon, said pinions meshing with the bolt
forces from any source except when applied to 20 means and sleeve gear means respectively.
the control casings 44-66 of the mechanisms.
3. A gun support comprising in combination,
It will also be understood that although only one
a bolt formed to be connected to a gun for sup—
form of the invention‘ has been shown and de
port thereof, a sleeve rotatably mounted upon
scribed in detail it will be apparent to those
said bolt and formed with external screw threads
skilled in the art that the invention is not so 25 for screw threaded engagement upon a position
limited but that various changes may be made
ally ?xed frame, a collar mounted upon said bolt
therein without departing from the spirit of the
and ?xed against relative rotation with the gun,
invention or the scope of the appended claims.
means for retaining said bolt and said sleeve
I claim:
against axial displacements relative to each other,
1. A gun support comprising in combination, 30 a ring rotatably mounted upon said sleeve, gear
bolt means formed to be connected to a gun for
means formed upon said sleeve, relatively larger
support thereof, a sleeve rotatably mounted upon
gear means formed upon said collar, and a pair
said bolt means and formed with external screw
of axially aligned pinions rigidly interconnected
threads for screw threaded engagement upon a
and carried by said ring‘ in positionally ?xed rela
positionally ?xed frame, means for retaining said 35 tion thereon, said pinions meshing with the collar
bolt means and said sleeve against axial dis
and sleeve gear means respectively, whereby said
placements relative to each other, a ring rotatably
mounted upon said sleeve, differentially sized gear
ring may be manually rotated relative to said
collar to procure rotation of said sleeve at reduced
means carried upon said sleeve and said bolt
speed.
means respectively, and a pair of differentially 40
JOHN C. TRO-‘I‘TER.
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