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Nov. 12, 1946.
Filed oct. l5, 1941
4 Sheets-Shee’r. l
Nov. 12, 1946.
E. A. B. RICE ET A1.
Filed Oct. 15, 1941
4 Sheets-Sheet 2
Nov. 12, 1946.
E. A. B. RICE ET A1;
Filed Oct. l5, 1941
4 Sheets-Sheet 3
Nov. 12, 1946.
2,431,114 ‘
Filed ost. _15, >1941
4 Sheets-Sheet 4
47 4e 48
Patented Nov. l2, 1945
v 2,411,114
Edward Arthur Beckton Rice, Newton Abbot, and
' Alfred German Rose and Sidney Curtis, Gains
borough, England; said Rose and said Curtis
assignors to Rose Brothers (Gainsborough)
Limited, Gainsborough, England, a company of
Great Britain l
Application October 15, 1941, Serial No. 415,028
In Great Britain October 24, 1940
7 Claims.
(Cl. Sil-37.5)
This invention relates to gun mountings of
cording to the invention, shown in position in
the type in which the gun or gun assembly is
mounted on a carriage arranged for movement
along a track.
It is an object of the present invention to pro
vide a gun mounting of this type in which the
»gun carriage can be quickly moved from one
the fuselage of an aeroplane,
Figure 2 is a part sectional end elevation of
the mounting, drawn to a larger scale than Fig
ure 1, as viewed from the right of Figure 1, the
carriage being deemed to fbe in a central posi
tion on the track,
Figure 3 is a plan view of the carriage, drawn
to a larger scale than Figures 1 and 2, with the
position to another along the track Without dis
tracting the attention of the operator from the
target and without the need for much exertion l0
on the part of the operator.
upper structure removed,
Figure 4 is a part sectional elevation taken on
the line 4-4 in Figure 3, with a portion of the
According to the present invention, there is
upper structure removed, and»
provided a gun mounting of the type described
Fig. 5 is a diagram illustrating the construction
wherein the carriage is arranged to be driven
along the track by a, rotatable driving member 15 of the track.
Referring to the drawings, a track generally
mounted in the carriage and engaging the track,
indicated by reference numeral II is mounted in
driving means being provided on the carriage for
the fuselage l2 of an aeroplane by means of sup
bringing labout rotation of the driving member,
porting brackets I3, attached to a platform IllV in
and wherein the starting and >stopping of the
driving means is controlled by a pair of control 20 the fuselage, and a bracket I6 attached to a
ling members one of which is adapted upon oper
ation to cause the driving means to rotate in one
direction and the other to cause the driving
shield I'I which is itself mounted on the platform
I4 by means of a bracket I8. The track II con
sists of a straight portion a, extending trans
gun assembly.
to the invention enables a gun or guns to be
The track II has a cross-section of channel shape
and is disposed with the flanges I9 of the section
horizontal and the Web-2| of the section on the
manual operation of control means on the gun
Supported on rollers 22 arranged to run on
versely of the fuselage I2, and two arcuate por
means to rotate in the opposite direction. Con
veniently, the controlling members are adapted 25 tions b merging into the straight portion a and
extending towards the front of the aeroplane.
for attachment to the hand grip of the gun or
More speciñcally, the gun mounting according
swung in azimuth in opposite directions by the 30 insid_e of the track.
the faces of the ñanges I9 is a gun carriage 23
attached to the top of which is a gun supporting
Conveniently, the motor is mounted on the
pillar 24 which is formed at its upper extremity
carriage in such a manner that, in the' event of
failure of the motor to drive the pinion for any 35 with a split bearing 26, 21 adapted to carry a
gun assembly consisting of a pair of machine
reason, e. g. a discharged battery, the motor can
guns 28. The portion 26 of the bearing 26, 21
be quickly disconnected from the pinion, leaving
is hinged on the pillar 24 at 29 for easy re
the carriage free to be moved along the track
moval of the gun assembly, a quick-release pin
by hand. Thus, the motor may be carried on 40 3l being provided for locking the two parts of
a bracket pivoted on the carriage and provided
the bearing together.
with a spring tending to cause the bracket to
The gun carriage 23 embraces the track I I and
swing away from the carriage to disconnect the
is guided on the track by a pair of rollers 32
motor from the pinion, the bracket being nor
and tWo pairs of rollers 33. The rollers 32 are
mally locked in position against the action of the 45 arranged to bear against the face of the web 2|
spring by a spring-loaded locking pin passing
of the track II (see particularly Figure 4), one
through the bracket into the carriage and re-`
towards the top of the track and the other to
leased by pulling out the pin.
wards the bottom, and are freely mounted‘on a
The invention is particularly useful in its ap
vertical shaft 34 rotatably supported in bearings
plication to gun mountîngs for aircraft, armoured
36 housed in the upper and -loWer wallsofthe
cars and the like, and, by way of example, such
carriage. The rollers 33 are varranged to bear
an application of the invention will now be de
against the vertical faces of the flanges I9 of
scribed in greater detail, with reference to the
the track I I, the upper pair being freely mounted
accompanying drawings in which:
on studs 31 attached to the upper wall of the
Figure 1 is a plan view of a gun mounting lac 55 carriage 23 at positions one on each side of the
or guns.
axis of the rollers 32 (considered in the direction
of travel of the carriage), while the lower pair
carriage 23 is shown in this position by chain
dotted lines. The profile of the cam surface 39
is such that the rollers 33 and the roller 32 con
tinue simultaneously to bear on the track I I dur
ing the passage of -the carriage 23 from the
are freely mounted on studs 38 attached to the
lower wall of the carriage at positions coaxial
with the studs 31.
The face of the web 2l of the track II and
the vertical faces of the flanges I9 of the track
thus act as guiding surfaces for the carriage 23
and the width of the track Ii, i. e. the distance
between the face of the web 2i and the vertical
faces of the flanges i3, is such as -to provide just
sufficient clearance between Vthe ytrack II andthe
rollers 32 and 33 for easy running. ~It will be
understood that the width of the track ii is
greater on the arcuate portions b than on the
straight portion a to the arcuate portion b and
Vice versa.
With this construction, the rollers 33 and the
roller 32 are disposed so as to provide rigid sup
-port for the carriage at any position on the track
while, at -the same time, the carriage can be
freely moved along the track.
Secured to the central grooved portion of the
shaft 34 is a pinion 4I arranged to mesh with a
rack 42 secured to the central portion of the web
'2l of the `track II. The portions of the rack
straight portion a because of the ytriangular dis
position of the rollers 32 and 33 as viewed in
corresponding t0 the straight portion a and the
arcuate portions b of the track i I each have teeth
of a standard form except on the portions corre
sponding to the cam surfaces 39 where, it will be
At the junctions of the straight portion a and
»the arcuate portions b of 'the track II, the face
of the web 2| is provided> with a cam surface 39,
understood, `the teeth have to be slightly modi
fied in shape so as to allow smooth operation be
the purpose of which ’is -to ensure that Vthe `roll
ers v32 and 33 continue simultaneously to bear on
tween the rack 42 and the pinion 4i .during‘the
the >track II during the passage of the carriage
.23 from the straight >portion a to the arcuate
portions b and vice versa.
The construction of the track -II is shown in
Figure 5 and since the arcuate portions Vb merge
into the ends of the straight portion a in-an iden
tical manner, it will be sufficient -to 'describe >the 30
passage of the carriage from the arcuate por
tions b to the straight portion a and Vice Versa.
The shaft 34 protrudes through the bottom wall
of the carriage 23 and has secured to its protrud
ing grooved end a driving ñange 43 which is ar
ranged t0 be driven by an annular wormwheel 44
through a pair of flanged gripper members 45
in a manner which will'be described later. The
merging of one of 'the arcuate portions vbintlofthe
wormwheel 44 is arranged to'be driven by a'worm
straight portion a.
46 secured to a shaft 4-1 supported in bearings 43
The outer surface of the arcuate portion b of
„carried by a bracket 49 pivotally attached at _50
the track II, i. e., the path followed 'by the Ver
tical faces of the flanges I9, follows an ,arc struck 35 to a'bracket `5I secured to the carriage -23. >Stops
52, ‘having inclined abutment surfaces, are formed
from a'point o until itfmeets the-outer >surface
on Ythe bracket Y49 Vto -prevent excessive -pivotal
of the straight portion a at av point »in a line
>movement thereof, the vabutment surfaces nor
o_o, 'theline o_o being disposed-normal to the
mally being clear’of the carriage 23 byl an amount
straight portion a of the track and passing
through the'point o. lThe straightportion a'o'f the 40 sufficient to allow adequate pivotal movement of
the bracket ‘49. The worm 46 is driven from an
track thencontinues as a tangent to the -outer
electric motor 53, 'attached to >the bracket -4'9
surface of the arcuate portion b. vThe yinner sur
through gears 54, 55 and155,~t‘he~gear~54 being
face of the arcuate portion b of the track VII,
secured tothe armatureshaft '51 of the motor
i. e., the face of the web 2l, also follows an arc
struck from the point o luntil it meets >a radial 45 53,-the gear 55'being freely mounted on ay studi-58
carried by the «bracket‘49 and the gear «56 being
line o--c, and then continues as a compensat
secured to the worm shaft 41.
:ing cam surface `39 yuntil it meets the inner .sur
TheV annular wormwheel v44fis formed with an
face of the straight portion'a at a point "in a
Vinterna-1l surface »which tapers from v`a rmaximum
line d-d running parallel with the -line o_o.
The inner surface of the straight portionva then 50 diameter at "the outside‘edges of the‘annulus `to
a minimum diameter midway in the >`width'of'the
>continues on a path parallel to that followedfby
annulus (see Figure 4) , and is supported- on the
the outer face of the straight portion a.
flanged gripper members 45th@ `flanges of which
It will .thus be seen that the compensating cam
surface 39 extends on each side of the’line .o-o.
The length of the cam surface '39 and its disposi
are shaped'soas to mate with »the internal nsur
55 face of the wormwheel 44. The gripper Vmem
bers l45 Vare squeezed-towards each' other lto' grip
the internal surfaceof thewormwheel ï44 lby a
series ofsprings 59 supported on studs G-I `passing
freely through lthe gripper members 45 and the
moving from left to right, it will be seen from the
two positions of the carriage 23 shown in `Figure 60 drivingflange`43. The upper gripper member 45
‘is secured to the driving ñange ‘43 vby a series `of
5, that the cam surface 39 extends to the‘left of
driving bolts~62 >the heads of which pass through
line o-o‘by an amount such that when the centre
tion in relation to the line o-o depends :on the
relative dispositions of the roller 32 and the roll
ers 33. Thus, assuming'the carriagel 23 to be
the lower-gripper .member 45. The `pressure ex
of the forward roller 33 lies on the line o---o, and
lthe roller is thus at the junction of the straight
and arcuate portions of the track I'I, the centre
of the roller 32 lies on the line d-d and is thus
about to come under the influence of the cam
. surface 39; The carriage 23 is shown in this posi
tion by full lines. The full length‘of the »cam
'surface 39 is such that when the centre vof the
rearward roller 33 lies on the line-‘o-o, and the
carriage as a wholeis'thus about’tov move'on to
the arcuate portion'b of the track, the centre of
erted by the springs' 59 is adjustable by means of
nuts 63 for the purpose of varying vthe gripping
pressure between the gripper members -45 `and the
wormwheel 44.
With the above construction,it will beseen that
the wormwheel -44 andthe gripper members 45
constitute a slipping clutch mechanism which will
prevent damage to the apparatus in the - event
that the motor 53 iskept running longA enoughto
cause the carriage v23 to strike the Y supporting
`brackets I3 at the ends of thetrack I-I ,the worm
the-roller 32 >lies on the radial line o-c Vand 'is
thus about to leave the cam surface 39. The 75 Wheel 44, in such an event, merely slipping round
_the recess 1I in the carriage 23,'whereupon the
bracket '49,* together with the moto'rf53 and its
associated gearing," is caused to-«swing'outwardly
`the gripper members 45 against the action ofthe
springs 59.
A " Asmentioned above, therbracket '49 is pivoted
at 50 and carries the motor 53 withits -gear 54,
the intermediate gear 55, and the worni 46 with' its
gear .56. It will be seen, therefore, that when
the-bracket 48 is swung awayfroni the carriage 23
`the worm- 46 is caused to 'disengag'eßfrom the
wormwheel 44 and thusdisconnect the ~driveïfrorn
the motor-53 to the pinion 4I.~ A leaf spring 66«is
attached to the carriage 23 and is caused'to exert
aspring pressure against the bracket 49 when- it
is inthe operative position, as shown in Figure 4,
so lthatfthe bracket 49 is continuously urgedto
swing outwardly.
In order to'lock the bracket 49 in its operative
>position against the action of the spring 66,
there is provided a plunger 61 which ishoused in
a bearing 68 attached to a lug 69 extending from
the bracket 49 and lying adjacent an end >of the
vertical wall of the carriage.
The plungerv 61
un'derthe action of the spring‘- 66.' to-¿disconne'ct
the worm 46 from v'the'wormv'vheel~44. =The car
riage`23 is then free to b'e moved along the track
by» hand(r When the mounting is beingused- in
this manner, the carriage Y23 may be locked atany
given position along the track I I by pushing the
bracket 49 towards» the carriage untilthe plunger
61 snaps back into locking position when the
worm 46 byî its engagement with the lwormwheel
44 effectively locks the carriage against movement
along the track. A hand knob 83 is attached to
the armature'shaft 51 of the motor at the oppo
site end to the gearf54 for the purpose of turning
the armature shaft» slightly in case the worm 46
does not properly engage the wormwheel 44 when
the bracket 49 is sw- ng back into operative posi
1. A gun mounting comprising a- track,`a` gun
passes through the lug 46i into a recess 1I »in the
carriage movably supported on the track and _ar
carriage and the bearing 68 is formed with a
ranged to carry a pair of guns, vmeans von said
recess 12 for the accommodation of a spring 13
disposed around the shank 14 ofthe plunger 61 25 carriage for guiding it along the track, the track
being formed with _a rack extending along'v its
and bearing at one end against the >plunger G1
length, a rotatable pinion mounted in said-car
and at the other end against the base of thel re
riage and arranged to engage the rack, a revers
cess` 12. The shank 14 protrudes through the
ible electric >motor mounted on said -carriage in
bearing 68 and has secured to itsend by means
of a pin 16 a. knob 11 in_which isgsecured a pin 18 30 driving - connection” withfsaid pinion,` said vmctor
being> carried on a bracket pivoted’on said ca‘r
to facilitate handling.VA ' ~
riage, spring means tending >to cause said bracket
In order to counteract any twisting moment in
to swing away from said carriage so as to dis
the carriage 23 arising from the disposition of
connect said motor from said pinion, a, spring
the motor 53 and its associated gearing in rela
loaded locking pin arranged to pass through said
tion to the track I I, there is secured to the lower
bracket into said carriage so as to lock said
wall of the carriage 23 an arm 19, suitably re
bracket in its operative position against the action
cessed for the accommodation of the wormwheel
of said spring means, and a pair of switches ar
44 and its associated parts, provided at its ex
ranged to connect said motor with a source of
tremity remote from the carriage .23 with a roller
8l freely mounted on a stud 82 secure-d to the arm 40 electric power, e. g., a battery, in such a manner
that one switch is capable of bringing about ro
19, the roller BI being arranged to bear against
tation of said motor in one direction and the
an auxiliary track 83 secured to the platform I4
other is capable of bringing about rotation of said
by means of bolts 84.
motor in the opposite direction, said switches be
The motor 53 is of the reversible type and is
ing adapted for attachment one to the hand grip
connected to an electric battery (not shown)
of each of said guns.
through a pair of contactor starters (not shown)
2. A gun mounting comprising a, track of the
and a pair of thumb switches 86 and S1 attached
kind in which portions having different paths
one to the hand grip of each of the pair of ma
merge into each other, said track being formed
chine guns .28, the electrical connections being
such that the switch 85 causes the motor 53 to 50 with two opposing carriage-guiding surfaces, a
gun carriage movably supported on said track and
rotate in the direction necessary to drive the car
arranged to engage said guiding surfaces at at
riage 23 from right to left (as viewed in Figure
least three points simultaneously, at least two of
1) and the switch 81 causes the motor to rotate in
said points being on one of said surfaces and the
the opposite direction to drive the carriage from
remaining point or points being on the opposing
left to right.
surface, at least one of said surfaces being formed
It will be seen that, to move the carriage 23
on at least one merging portion of the track with
from one position to another on the track I I, it is
at least one compensating cam surface against
only necessary for the operator to depress one
which a surface-contacting point on said car
or the other of the switches 86 or 81, depending on
the 'direction in which it is desired to move the 60 riage bears, during passage of said carriage over
said merging portion of said track, to cause said
carriage, whereupon the motor 53 is caused to
carriage to continue to bear on said track at said
rotate in the appropriate direction and drives
the pinion 4I through the gears 54, 55 and 56, the
worm 46 and the wormwheel 44, the pinion 4I,
in turn, rolling along the rack 42 to drive the
carriage 23 along the'track Il.
The pivotal mounting of the bracket 49 allows
the drive to the pinion 4I to be disconnected at
3. A gun mounting comprising a track the path
of which comprises a straight portion and a
curved portion merging into each other, said track
being formed with opposing outer and inner
carriage-guiding surfaces, a gun carriage mov
ably supported on said track and arranged to
will so that, should the necessity arise, the car
riage 23 can be freed for movement along the 70 carry a pair of guns, guiding means on said car
riage arranged to engage said surfaces at three
track Il by hand operation. Thus, in the event
points simultaneously for guiding said carriage
of failure of the motor 53 to drive the pinion 4I
along said track, two of 'said points being on said
for any reason, it is only necessary for the oper
outer surface and the remaining point being on
ator to withdraw the knob 11 against the action
of the spring 13 until the plunger 61 is clear of 75 said inner surface, said inner surface being pro
“2,41 1, 1 114
,videdon the mergingportion .of _said track with
acompensating cam surface againstwhichfone Vof
the :carriage-,guiding ymeans is arranged to î'bear
during passage of said »carriage yover said Yper
»the'track-to cause the movement of said `.carriage
along the track.
6. A gun mounting comprising a track, a ygun
carriage movably supported Von the track,v means
on said carriage for guiding it along .the track, a
.tionof said track to cause said ¿carriage to'con
tinue lto bear at -said Vthree points, a rack ex
tending along the ¿length of _said "track, „and a
rotatable pinion Ymounted 'insaid carriage >and
rotatable driving member mounted in said car
riage and arranged .to engage the vtrack .so asto
`cause said carriage to move along'the track, driv
arranged »to engage said-rack.
ing means mountedon said carriage and arranged
.4. A gun mounting including -a ,-track, a gun 10 to »bring about rotation Aof said driving mem
carriage having _guidedymovement fon Said track,
`driven means on said vcarriage contacting _said
track to cause `the movement ,of Athe -.c„arriag_e, a
bracket -connected with said carri-age for move
ment to an active position or aninactiveposition,
and driving means on said ‘bracket which coop
erates with said driven means to drive the latter
to move vthe carriage when ¿thebracket is «in the
active position, said driving means being disen
gaged from said driven means when the bracket
is in its inactive position.
5. A gun mounting including a track, a gun
carriage constructed and arranged to move` along
said track, rollers on said .carriage rotatable on
vertical axes respectively invrolling contact Vwith
opposite sides respectively of said track, other
rollers >on said carriage >rotatable on horizontal
ber, said driving means beingcarried on a-bracket
-pivoted `on said carriage, :spring means tending
to cause said bracket to swing away fromïthecar
riage, so as to disconnect the driving .means »from
the driving member, means formaintaining said
bracket in the driving position, Vmeans for >releas
ing vsaid bracket so las Lto allow it to swing away
from the carriage under the inñuence .of `the
spring, and a pair of controlling members fin ycon
nection-with said driving means, one of the con
trolling members being arranged upon voperation
to cause the driving means to vrotate in one direc
tion andthe other-to cause the driving means »to
rotate in the opposition direction.
7. A gun mounting according to claim 6, in
cluding a ñxed stop arranged to limit the extent
of the pivotal movement of said bracket under the
Aaxes respectively in rolling contact with upper
inñuence of sai-d spring.
surfaces of said track respectively, a driven shaft
providing the axle for certainof said rollers, and 30
means on the shaft which coacts with means on
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