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Патент USA US2405678

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A. 13, 14s.
2,4055%
E’. c. WAHLBERG
REMOTE C_ONTROL SYSTEM
Filed Aug. 6, 1943
3 Sheets-Sheet l
l0 7
.
I10
I09
ATTORNEY
Aug. 13v, 1946.
E. CfWAHLBERG
' 2,405,678!
REMOTE CONTROL SYSTEM
Filed Aug. 6, 1943
' 3 Sheets-Sheet 3
ril ,
\WilL':
ATTORNEY
Patented Aug. 13, 1946
UNITED STATES PATENT OFFICE
2,405,678
REMOTE CONTROL SYSTEM
Eric Clifton Wahlberg, Stamford, Conn, assignor
to Electrolux Corporation, Old Greenwich,
Conn., a corporation of Delaware
Application August 6, 1943, Serial No. 497,600
5 Claims. (Cl. 172-239)
1
This invention, relates to a system of remote
control and more particularly to such a system
_
2
.
control levers. In a speed control system there
must, of course, be an additional follow-up sys
tem for repeating the position of the gun at the
gun director station. With a space control system
produced a number of new problems because of 01 the position of the sight itself serves as an indi
cation of the position of the gun.
the fact that such aircraft are required to ?y at
In most of the prior art remote control sys
very high altitudes. When ?ying at high alti~
tems of either of the above mentioned types there
tudes, it is necessary that the occupants of the
has been a considerable lag in the system so
plane be supplied with oxygen in addition to that
that as long as the gun'was in motion the indi
present in the rari?ed atmosphere. If this is
cated position thereof at the gun director sta
done by the use of an oxygen mask, it'is found
tion was slightly in error. In the case of known
that the occupants of the plane are somewhat
space controls the sight must ?rst be moved
handicapped by the necessity of having to wear
through a certain angle before the gun starts
the mask and furthermore their bodily efiiciency
to follow the motion, and in known speed con
is reduced because of the high percentage of oxy
trols the’gun must move through a certain angle
gen in the mixture which they breathe and be
before the repeater at the gun director station
cause of the low pressure around their bodies.
for use in aircraft, especially military aircraft.
The design of modern military aircraft has
It has been proposed to solve this problem by
providing the occupants with space suits but al
begins to move.
pheric conditions.
markedly.
Such error can be reduced to a
sufficiently small value so that such remote con
though such suits overcome some of the above 20 trol systems are satisfactory for naval ?re con
trol systems and land batteries when the target
mentioned problems, they are even more cum
is relatively ?xed. However, for antiaircraft
bersome than the oxygen masks. The only really
guns and for armament on ?ghting planes them
satisfactory solution is to seal the cabin occupied
selves any time lag or mechanical lag whatsoever
by the aircraft personnel and supercharge it so
reduces the e?iciency of the ?ring system very
as to maintain within the cabin normal atmos
If a sealed cabin is used, there is a difficult
This is due to the extremely high
speeds and close ranges involved. For such ap
plications it is imperative that the lag approx
imate zero as closely as possible.
problem presented in connection with the oper
ation of the gun turret. A revolving turret with
It is the principal object of applicant’s inven
apertures through which moving guns project is 30
tion to provide a remote control system embody
a rather di?icult construction to seal e?ectively.
ing both space control and speed control in which
The gun, however, must have an operator and
the lag has been reduced to a minimum. This is
the operator must be supplied with oxygen, the
accomplished in part by the use of a novel con
same as the rest of the occupants of the plane.
As a solution of this problem, applicant proposes 35 trol system in which the gun turret and sight
ing device are driven by synchronous motors op
to locate the gun turret in a part of the aircraft
erated in parallel from the same source of power
separate from the sealed cabin and operate the
so that there is no lag introduced in the system.
turret by remote control. Electrical remote con
It is necessary that these motors operate in ex
trol rather than mechanical is desirable because
.there need be no packed sliding joints where the 40 act synchronism throughout repeated starting
and stopping operations and further that the
electrical control wires pass through the wall of
motors stop quickly when deenergized. This is
‘the sealed cabin. With such an arrangement a
gun director may have an observation window
forming one wall of the sealed cabin and may op
accomplished by an adaptation of applicant’s
fled in two groups called respectively space con—
ary 15, 1943.
trol and speed control systems. By space control
it is meant that the gunner controls the position
of the remote guns merely by pointing his sight~
ing device at the target. As the sighting device
Another main object of applicant’s invention
is to provide an improved space control system.
system of synchronized motors disclosed in
45 greater detail in his copending United States
erate the gun turret by remote control.
Patent applications Serial No. 428,018, ?led J an
Electric remote control of guns is Well known
uary 24, 1942, and. Serial No. 472,464 ?led Janu
in the art. Such control systems may be classi
is moved to follow the target, the guns move in
a like direction. By speed control is meant the
control of the position of the remote guns in azi
muth and altitude by movement of azimuth and
altitude control levers at the gun director sta
tion in which the speed of movement of the gun
in either azimuth or altitude is dependent upon
the degree of displacement of the corresponding
>
>
According to this invention the space control not
only operates to drive the sight at the gun di
rector station but also drives a seat or platform
upon which the gun director is seated thereby fa
cilitating his operation of the space control.
Further to the accomplishment of both of the
above stated objects it is another object of this
invention to provide a space control in which
initiation of motion is accomplished without mov
ing the sighting device itself. To accomplish this,
2,405,678
3
4
applicant moves a member that is concentric with
the sight. This system eliminates the lag between
mounted on the gear 28 and drives gear 3|
through worm 34. worm wheel 35, and bevel gear
the position of the sight and the gun that is in
.36..
.
herent'in space controls dependent on displace
ri‘he gear 3'! carries standards 3-‘! and 38 at the
ment of the sight for initiation of motion. It CH upper ends of which are bearings 39 and 49.
also makes possible a more sensitive control,
Shaft 4| carrying a telescope or other sighting
While this invention will be described in its
device 42 is rotatably mounted in the bearings
application to remote control of guns in military
39 and 48.. Standard 33 supports an L shaped
aircraft, it should be understood that italso has
standard 43 having a bearing 46a at its upper
numerous non-military uses. As one example of
such use might be mentioned the control of a'
end. Standard 43 also carries an electric motor
'44 which drives .a gear 45 through a bevel gear
45. Supported on the gear 45 is an electric motor
steam shovel, crane, orother lifting device by an
operator located in a control cabin some distance
away from the shovel itself,
4:’! which drives the shaft ‘4| through worm 43
and Worm Wheel 49. At the other end of the
shaft 4! from the worm wheel 49 there is sup
ported on a standard 3'! a potentiometer 5D, the
moving contact '5! of which is mounted on the’
The cabin might
either be mounted on the body of the machine
together with the driving apparatus or it might
‘be located entirely separate from the apparatus
in a stationary or ‘moving control station. Since
end of the shaft M. A similar potentiometer '52
the claimed features of 'the invention are fully
disclosed ‘by the description of its application in
is carried on a stationary part 520. of the fuselage. '
Its moving contact 53 is driven by the shaft 30
through ‘bevel gears 93 and 99.
It will be apparent that as long as electric
motor 33 is at rest ‘the electric ‘motor ‘21 will drive
a military'?re control system, it has been thought
unnecessary to describe it in other applications.
Further objects and advantages of the invention
will appear ‘from the description set ‘forth ~vbelow.
Referring to the drawings, Fig. 1 is a perspec
tive view of a military airplane embodying my in
vention. Figs. 2 and 3 are elevations, largely
shaft 39 at the same speed it drives shaft '24.
Likewise, as long as motor 41 is at rest, the motor
44 will drive shaft 4| at the same speed it drives
gear 4-5. The motors 2‘! and 44 thus serve to
schematic, of the gun director and gun turret
drive the telescopic sight 42 in azimuth and alti
respectively. Figs. 2A and 3A are views similar
tude respectively, ‘The motors 33 and. 41 are pro
to Figs. 2 and 3 showing the correction ‘motors 30 vided merely to introduce any necessary correc
associated with the gun turret; Figs. 4 and '5
tive displacement between shafts 24 and 30 and
are wiring diagrams showing the electric circuits
between gear 45 and shaft M. The purpose and
used in the invention, Fig. 6 is a perspective
operation of the corrector motors 33 and M will
view and Fig. 8 a section showing certain details
of the combined speed and space control appa
be described later.
Referring to Fig. 3, there is shown the gun
turret I8 which is mounted on gear 9%. Gear Bil
ratus according to my invention and Fig. 7 is an ‘
exploded view of a switch suitable for use in con
is rotatably supported on the ‘frame 9I of the
fuselage by means of an annular ?ange 92 coop
erating with an annular groove 93 formed vin the
designated generally by the reference character 40 frame 9| near the outer surface of the fuselage.
It. The ‘airplane comprises a fuselage H having
An electric motor 95 supported on the frame 9|
Wings I2. The fuselage comprises a forward
drives the gear 90 through a bevel gear 91. Sup
sealed cabin I3 and an after part I4. The cabin
ported on ‘the gear 9!} are standards 94 and 95
I3 is ‘provided with observation windows I5, I6,
carrying a shaft I 96 in bearings at the upper end
nection therewith.
Referring to Fig. 1, there is shown an ‘airplane ,
and IT for the pilot,‘bombardier, and gun director
respectively. A revolving gun turret I8 is shown
in the after part I 4 of the fuselage. If desired,
additional turrets similar to I8 could ‘be provided
beneath the fuselage and also on the wing sur
‘faces. ‘Motors I 9 having propellers 20 are mount
ed ‘in the wings. The airplane 'is vprovided with
ailerons 2|, rudders 22,, and elevators 23. Ac
cording to this invention the ailerons, rudders,
and elevators should 'be ‘operated by electric re
thereof. An electric motor I03 is supported on
‘the gear 98 and drives shaft I95 through ‘bevel
gears £84 and ms. Guns I02 are mounted at
either end of the shaft I06. The ends I!" of the
guns project ‘through slots I08 in the armored
turret I8, The slots I58 are ‘long enough to per
mit the guns‘ I62 to move as much as needed vin
the vertical plane. .If desired, these slots I08 may
be continuous from .one .side of the turret to the
other, providing .for movement .of the guns
mote control means of any known type from ‘
through an arc of ‘130° or more. A potentiometer
I439 is supported inside the turret l3. Its moving
within the sealed cabin I'3. Likewise, the pro~
peller pitch ‘changing mechanism and the engine
contact I H) is carried by the end of the shaft I 0.6,
throttles should be operated by similar remote
A similar potentiometer I00 is mounted on the
‘control means from within the sealed cabin, Re
frame 9|. The moving contact I EH is driven by
mote control means for operating the gun turret .60 the electric motor 95. 'It will be seen that the
‘I8 from within the cabin is the principal subject
apparatus just described provides for movement
of this invention and will be described with ref
of the guns I82 in both azimuth and altitude.
The guns are driven in azimuth by motor 96 an
erence ‘to the ‘remaining ?gures of ‘the drawings.
Referring to Fig. 2, there is shown the gun
in altitude by motor'I U3.
directing apparatus that is moun‘tedimmediately
below the "observation ‘window IT. A shaft 24 "is
mounted in end bearing ‘25 supported on ‘the
frame 26 ‘of ‘the fuselage. An electric motor '21
2 and '3 should 'be such that when motors 21 and
96 are driven in synchronism, the sight 42 and
the guns I82 will ‘be moved in azimuth through
the same angle and at the same speed. Likewise,
also mounted on the 'frame 25 drives a gear 28
through bevel gear 29. Gear 28 ‘is supported on
the shaft :24. In axial alignment with shaft '24
"there is a second shaft 33 supported on gear .23
by a bearing em. ‘Shaft 36 has attached thereto
‘
The gear ratios of the apparatus shown in Figs.
a gear 3| and on the upper ‘end of the shaft there
the gear ratios should be such that motors .44
and I03, when operated synchronously, will drive
the sight 42 and the guns I02 synchronously in
altitude.
Should the main motors get out of syn
chronism, corrector motors 33 and 41 are auto
‘is affixed a seat '32.
matically operated to restore synchronism be
An electric motor '33 is
'
2,405,678
5
tween the sight 42 and the guns I02. These cor
rector motors are controlled by balanced bridge
circuits comprising the potentiometers 50, I09, 52,
and IE0. The gear ratios of the apparatus should
be such that moving contact 5| and moving con
tact Ill} operate synchronously as long as the
sight 42 and guns I92 move synchronously in
altitude. Likewise, the gear ratios should be such
that moving contact 53 and moving contact Illl
operate at the same speed as long as the sight 42
and guns H52 move synchronously in azimuth.
Should the main drive motors get out of synchro
nism, the sight and guns would also get out of
synchronism and likewise the positions of the
moving contacts of the potentiometers. This
would upset the balance of the bridge circuits and
operate the corrector motors to drive the sight
back into synchronisrn with the guns. The de
tails of an electric circuit for carrying out this
operation will be described later.
It is obvious that collector motors 33 and 41
may be incorporated in the apparatus for driving
the gun turret instead of that for driving the
sight. Figs. 2A and 3A illustrate the arrange
ment of the sight and turret, respectively, when
the correction motors are so arranged, in which
inder 54 with respect to sight 42. A collar 65
formed on sight 42 provides a sliding seal for the
opening 64. Either the collar is resilient or there
is enough play provided to permit relative motion
at this point.
In Fig. 6, there is shown the construction of
the operating levers connected to the cylinder 54
for rocking it with respect to sight 42. Control
lever 56 is rigidly affixed at one end to the cylin~
10 der 54 and is pivotally connected at its opposite
end to handle bar 12.
It will be apparent that
if an operator seated on seat 32 (Fig. 3) moves
both the handles 16 and ‘I? on the ends of the
handle bar '52 in the same direction either towards
15 or away from himself, a motion will be imparted
to the cylinder 54 rocking it with respect to sight
42 in a plane perpendicular to the shaft 4|. On
the other hand, if the operator moves one of the
handles towards himself and the other handle
20 away from himself, the cylinder 54 will be rocked
with respect to sight 42 in the plane containing
the sight 42 and the shaft 4|. In this arrange
ment the end 292 of the sight 42 is located close
to the axis of the shaft 4! so that change in the
25 altitude of the sight 42 will not produce any great
change in the position of the eye piece thereof.
This is desirable so that the gun director will not
case the correction motors drive the guns back
have to move his head appreciably in following
into synchronism with the sight, thus making it
unnecessary to re-sight the latter after a correc
a target. The handles 15 and TI, however, are
tion has taken place.
located a considerable distance below the shaft
4! in order to be near the operator’s hands. This
Referring again to Fig. 2, there is shown a
provides a certain leverage between the handle
control cylinder 54 mounted concentrically with
bars '55 and T! and the cylinder 54 whereby a
the telescope 42. This control cylinder may be
slight pressure on the handle bars will produce
rocked slightly with respect to the telescope by
movement of the handles 16 and ‘I’! on the ends 35 suihcient motion of the cylinder 54 to actuate one
of the switches 58 and a slight additional pressure
of the handle bar 1'2. The details of construction
without appreciable movement will operate one of
of this combined speed and space control are
the switches 59. Switches 59 operate to drive the
shown in Figs. 6 and 8. As shown in Figs. 6 and
sight and gun at one speed and switches 58 operate
8, the sight 42 is carried by shaft 4| in a support
ing ring 55. The supporting ring 55 is formed 40 to drive them at a higher speed.
Referring to Fig. 7, there is shown the internal
exteriorly with a spherical surface cooperating
construction of a snap action switch suitable for
with spherical surface 55 on the interior of cyl
use in this invention. The switch comprises a
inder 54 to form ball and socket support for the
casing 18 supporting conducting plates l8 and 8B.
cylinder 54. The cylinder 54 is cut away as at
A connection strap 8! is electrically connected to
20! to permit rocking thereof with respect to the
plate 79 and a similar strap (not shown) is con.
sight 42 without being hampered by the shaft 4!.
nected to plate 83. Plate 80 carries a contact arm
A?ixed to the interior of the cylinder 54 are four
82 which is bolted thereto at 83. Contact arm 32
stationary switches 58 mounted above and below
carries a silver contact 84 which cooperates with
and at either side of the sight 42. These switches
a similar silver contact 203 on plate 19 to open
are of the snap action type and are operated by
and close the circuit. Two leaf springs 35 are
push buttons 6!). Four more snap action switches
formed on the end of the contact arm 82 and
59 are mounted within the cylinder 54 and simi
their free ends 204 are supported in grooves 86
larly disposed with respect to the sight 42. The
in the end of plate 80. These springs are always
switches 59 are supported within the cylinder 54
slightly in compression, and together with contact
by means of springs 6!. There are studs 13 car
arm 82, form a compression toggle. A very slight
ried by the switches 59. These studs project
movement of contact arm 82 will cause the toggle
through apertures 14 in the cylinder 54. Buttons
to pass over center and snap into closed circuit
15 on the ends of studs 13 limit inward motion
position. When the contact arm 82 is allowed to
of the switches 59. When the sight 42 is centered
move back to its original position, the toggle will
within cylinder 54, the push buttons 62 of the
again pass over center and snap to open position.
switches 59 just make contact with the exterior
The contact arm 82 is moved by push button 50
of the sight 42. The springs 5| are suf?ciently
through insulation ‘block 81. A shim 89 having
strong to support the switches against movement
an opening 88 is supported on the plate 80 and
when the cylinder 54 is rocked with respect to
biases the button 53 outwardly. This shim also
sight 42 so as to permit actuation of the switches
serves to limit inward motion of button 65.} by
by push buttons 52. After a push button 52 has
rolling out ?at on the surface of plate 85. Such
been actuated, the corresponding springs 5! will
a‘ switch is quite useful in the present invention
be compressed, permitting actuation of the push
because of its characteristic of operating with a
button 60 of the adjoining switch 58 upon further
snap action from open to closed position upon
displacement of cylinder 54 in the same direction.
Very slight displacement of its push button.
Springs 5'! are provided for biasing the cylinder
54 into a position. of axial alignment with sight
In Fig. 4, there is shown a circuit diagram of
42. The end of the cylinder 54 is closed by means
the connections between the switches 58 and 59
of a cap 63 having an opening 54 centrally there
and the main drive motors. The switches 58 and
of of su?icient diameter to permit rocking of cyl 75 59 mounted in one plane at either side of the
2,405,678
night 42 control the operation of the motors‘ 21
and ;I‘I2 through armature resister I33.
and 955 fordriving the {sight and guns .in azimuth.
‘The switches 58 and 59 mounted in a perpen
.idicular plane above and below the sight 42 con
trol motors M and I53 for operating the sight
:and guns in altitude. Since the connections be
tween the switches in one Plane and their cor
responding drive motors are identical with the
connections between the switches in the other
motors vWill drive the sight ‘and guns in azimuth
These
until pressure on the .handle bars ‘I6 and ‘I1 is
released. If the operator wishes to move the gun
and sight more'rapidly, he mayincrease the pres
sure on the handle bars thereby further rocking
cylinder 54 to close switch 58a. This will energize
coil IL-III of relay I42 and its contactor 251 will
move to close a circuit between ?xed contacts
plane and their corresponding drive motors, only '10 I45 and M5 thereby short circuiting armature
resister I33 to speed up ‘the motors. If ‘the pres
sure on the handlebars is reduced, the switch
58a will again open and the short circuit around
Referring again to Fig. 4, there is shown the
resister I33 will also be opened. ‘This will cause
eight 42 ‘and the switches 58a and 59a on one side
thereof and the ‘switches 58b and 53bon the other 15 the motors to slow down. If the pressure on the
handle bars is completely removed, the cylinder
‘side thereof. The switches 59 are supported With
:54 will return to its position concentric with sight
in'the cylinder 54 on springs 5! and the switches
42 and the switch 53a will be opened. This ‘will
58 are i?xedly supported within the cylinder 54.
:permit the relay IAI to return to the normal po
In this ?gure the switches are ‘shown diagram~
matically. Also shown diagrammatically are 20 sition shown in Fig. 4. 'In this position of the
relay, direct current from power lines ‘III, H2
drive motors 2‘! and 95 and two relays designated
is supplied to the tie lines I25 vand I26 through
generally by reference characters MI and I42.
(contacts I32, I38 and I30, I27. At the same‘time
The system is energized from a source of direct
contact 235 closes a short circuitacross the arma
current connected to wires III and H2. The
tures of the motors through contacts I25, II 5. As
motors 21 and 96 are connected in parallel across
the connections between the azimuth drive mo
:tors and switches have been illustrated.
line ‘H3 and H4. Line I I3 is ‘connected to con
tacts I15, H5, and II’! of relay MI. Line H4 is
connected to contacts H8, H3, and I20 of the
described in applicant’s aforementioned copend
ing applications this brings the motors quickly to
rest by dynamic braking while maintaining them
‘same relay. Motors 2? and 95 are constructed
as single phase rotary converters and taps are
‘taken from ?xed points on their armatures to slip
in synchronism.
rings I21, I22, and I23, I25 respectively. These
slip rings are connected together by wires I25
similar to that described for movement closing
switches 58a and ‘59a and need not be described
in detail. The same is true of operation of the
system upon movement of cylinder '54 to close the
altitude control switches. It will also be ‘appar
and I26. . vWires I25 and I25 are also suitably
connected to contacts I21 and I28 of relay I4I.
Power line 'I I2 is connected to contacts I29, I 38
'
The operation of the system on movement of
the cylinder .53 to close switches '53?) and 59b is
and I3I and power line III is connected to con
ent that upon movement of the cylinder 54 in a
tact I32 of relay MI. Also connected to power
direction having components in both the azimuth
and altitude planes the corresponding switches
line I I I is a series armature resistor I33, the other
end of which is connected to contacts I34 an 40 will be closed to actuate the. azimuth and altitude
1350f relay MI.
'
Relay It! carries three moving contacts 254,
295, and 2%‘ and is operated by a solenoid I36.
The center of solenoid I36 is connected to a suit
able source of direct current such as battery I31,
the opposite side of which is connected by wire
I38 to one contact of each of the switches 59a
and 59b. The remaining contacts of these
switches are connected to the opposite ends of
the solenoid I36.
Battery I31 is also connected by wire I39 to
the actuating coil I48 of relay» I52. The opposite
end of coil I40 is connected to one contact of each
of the switches 58a and 55b. The remaining con
tacts of these switches are connected by wires .
drive motors simultaneously.
It might be that
the pressure on the handle bars ‘It and TI was
such as to operate one set of motors at high speed
while the other was operating at low speed.
‘Reference should now be made to Fig. 5 for a 7
description of the operation of the corrector sysé
tern. In Fig. 5, there is shown the circuit ‘for
operating azimuth corrector motor 33 upon rela
tive displacement of the contacts 53 and IE’II of
the potentiometers 52 and I55. The operation
of the altitude corrector motor 54. is identical
and hence the circuit diagram therefore has not
been shown. The ends of the potentiometers 52
and I35 are connected by leads I 53 and I55 to
form a Wheatstone bridge circuit. The bridge
is energizedby a suitable source of electric power,
I43 and I44 to the opposite pole of battery I31.
The relay I52 has moving contacts 251 which are V such as battery I55. The opposite poles of the
battery are connected to the moving contacts 53
normally in open circuit position. When relay
and Isl. As long as the sight and the guns are
‘I42 is energized, it connects contacts I45 and
I45 thereby closing a short circuit around'arma 60 in synchronism, the moving contacts 53 and IE!
will be in a position to cause balanced currents
ture resister I33.
to flow through the parallel arms of the bridge
Field windings I 41 and I 58 of the motors 2'!
circuit from the battery I55. Hence, no current
and 96 are connected in parallel across power
?ows through the coil I52 of the relay I5I, the
lines III and H2.
coil being connected across equi-potential points
The system operates as follows:
in the parallel arms of the bridge circuit. Should
When the operator, by pressure on the handle
the sight and the guns get out of step, however,
bars ‘I5 and ‘I1, rocks the cylinder 54 with respect
such as might occur through a failure of the ties
to sight 42 in a direction having a component in
between the main driving motors 2‘I and 95, the
the plane of the switches 58 and 59 controlling
moving contacts 53 and II}! will be'angularly dis
the azimuth drive motors 2'! and 96, one of the
placed from each other thereby unbalancing the
switches‘53, say 59a will bev closed. This will
bridge and actuating the relay I5I. The relay
energize solenoid I36 and cause the moving con
I5! constitutes a reversing switch for connecting
tacts of relay MI to move from their rest posi
tion to a position one step higher. "This will con
corrector motor 33 across power lines I59 and
nect motors 27 and 95 in parallel across lines I II
I512. The relay will connect the motor 33 in a
2,405,678
proper manner for actuating it to bring the sight
back into synchronism with the guns. If desired,
the power lines I49 and I58 may be connected
10
said member and having a zero position relative
to said member, electric motor means in driving
relationship with said member, electric motor
to the same source of power as the power lines
means in driving relationship with said body, each
I II and H2. The batteries I32 and I55 might also
be replaced by suitable connections to this same
of said electric motor means including an arma
ture winding and a ?eld winding, conductor
means providing a path for the flow of current
power supply.
between ?xed taps taken from said armature
From the foregoing description it will be ap
windings, means controlled by said device for
parent that I have provided a novel remote con
trol system and while certain features thereof 10 connecting said armatures to means supplying
electric power to drive said member and said body
are peculiarly adapted for use in the operation
with motions such that their positions always
of a ?re control system for military aircraft, there
bear a predetermined relationship to one another,
are many features which are of general applica
said device also controlling means for bringing
tion. Furthermore, it is apparent that many
modi?cations may be made in the preferred em 15 said member and said body quickly to rest while
maintaining the predetermined relationship, both
bodiment of the invention disclosed herein and
of said motorsbeing operated in response to the’
hit is intended to protect by these Letters Patent
displacement
of said device from its zero position
all forms of invention falling within the scope
relative to said member, the speed of operation
of the appended claims. Certain subject matter
disclosed but not claimed herein, is claimed in 20 of said motors being dependent upon the ampli
tude of the displacement of said device relative
my copending divisional application Serial No.
to said member.
652.322 ?led March 6, 1946.
4. In combination, a member, a body, a con
What I claim is:
trolling device mounted for movement relative to
1. In combination, a member, a body, a con
trolling device mounted for movement relative to 25 said member and having a zero position relative
to said member, electric motor means in driving
said member and having a zero position relative
relationship with said member, electric motor
to said member, electric motor means in driving
means
in driving relationship with said body, each
relationship with said member, electric motor
of
said
electric motor means including an arma
means in driving relationship with said body, each
ture winding and a ?eld winding, conductor
of said electric motor means including an arma 30
means providing a path for the flow of current
ture winding and a ?eld winding, conductor
between ?xed taps taken from said armature
means providing a path for the flow of current
windings, means controlled by said device for con
between ?xed taps taken from said armature
necting said armatures to means supplying elecwindings, means controlled by said device for
tric power to drive said member and said body
connecting said armatures to means supplying 35 with motions such that their positions always
electric power to drive said member and said body
bear a, predetermined relationship to one another,
with motions such that their positions always
said device also controlling means for bringing
bear a predetermined relationship to one another,
said member and said body quickly to rest while
said device also controlling means for bringing
maintaining the predetermined relationship, both
said member and said body quickly to rest while 40 of said motors being operated in response to the
maintaining the predetermined relationship, both
displacement of said device from its zero position
of said motors being operated in response to the
relative to said member, the speed and direction
displacement of said device from its zero position
of motion imparted to said member and body by
relative to said member.
45 said motors being responsive to the amplitude
2. In combination, a member, a body, a con
trolling device mounted for movement relative to
said member and having a zero position relative
to said member, electric motor means in driving
and direction of the displacement respectively of
said device from its zero position relative to said
member.
5. In combination, a member, a body, a con
relationship with said member, electric motor 50 trolling device, electric motor means in driving
means in driving relationship with said body, each
relationship with said member, electric motor
of said electric motor means including an arma
means in driving relationship with said body, each
ture winding and a ?eld winding, conductor
means providing a path for the ?ow of current
between ?xed taps taken from said armature
windings, means controlled by said device for
of said electric motor means including an arma
ture winding and a ?eld winding, conductor means
providing a path for the flow of current between
?xed taps taken from said armature windings,
means controlled by said device for completing
connecting said armatures to means supplying
electric power to drive said member and said body
a circuit from said armature and ?eld windings
with motions such that their positions always
to means for supplying operating electric power
bear a predetermined relationship to one another,
to drive said member and said body with motions
said device also controlling means for bringing 60 such that their positions always bear a predeter
said member and said body quickly to rest while
mined relationship to one another, said device
maintaining the predetermined relationship, both
also controlling means for short circuiting said
of said motors being operated in response to the
armature windings while maintaining the supply
displacement of said device from its zero position
of electric power to said ?eld windings for dy
relative to said member, the direction of motion
namically braking said motors to thereby bring
imparted to said member and body by said motors
said member and said body quickly to rest while
being the same as the direction of the displace
maintaining the predetermined relationship.
ment of said device relative to said member.
3. In combination, a member, a body, a con
trolling device mounted for movement relative to
ERIC CLIFTON WAHLBERG.
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