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Патент USA US2406855

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Supt. 3, 1946.
>_|-|. A. SATTERLE'E‘
2,406,855
APPARATUS FOR CONTROLLING ROTATION ‘
Filed March 2, 1936
15'
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3 Sheets-Sheet 1
19
INVENTOR.
BY
FIG. '3
'
‘
.
HOWARD A; SATTERLEE
, Sept. 3, 1946- .
H. A. SATTERLEE’
‘
'
2,406,355.
APPARATUS FOR CONTROLLING ROTATION
Filed March 2, 1936
.
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$2 49
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INVENTOR.
_
HQWARD'ASAT'FERLEE
_
BY
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Wick”?
SePt- 3, 1946‘
'
H.‘A..SATTERLEE
'_ ‘
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2,4065855
APPARATUS FOR CONTROLLING ROTATION
Filed March 2, 1936
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'INVENTOR'.
HowARo A. SATTERLEE '
2,406,855
Patented Sept. 3, ‘1946
UNITED STATES PATENT OFFICE
2,406,855
APPARATUS FOR CONTROLLING
ROTATION
Howard A. Satterlee, Sharon, Mass, assignor, by
mesne assignments, to Submarine Signal Com
pany, Boston, Mass, a corporation of Delaware
Application March 2, 1936, Serial No. 66,634
6 Claims.
1
The present invention relates to an apparatus
for controlling rotation. More particularly the
(01. 181—0.5)
2
schematic wiring diagram of one modi?cation of
the invention; Fig. 5 shows certain voltage curves
illustrating the operation of the system shown in
Fig. 4; Fig. 6 shows a modi?cation of the inven~
tion; and Fig. 7 shows an elevation of an adjust
able resistance device employed in the modi?ca
The present invention is especially adaptable
tion shown in Fig. 6.
to the control of the rotation of a signaling
The signaling head is shown at | in Fig. 1
head on a ship. In signaling under water with
mounted at the end of the tube 2 projected
compressional Waves it is often desirable to pro
through the skin 3 of the ship. At the upper end
ject a signaling head through the skin of the
of the tube 2 is a shaft 4 to which are rigidly
ship into the water beneath. The signaling head
secured the gears 5 and B. The actual work of
is a device for sending or receiving compressional
rotating the head I is accomplished by the motor
waves. In many cases it is necessary to be able
‘I to which further reference 'will be made later.
to rotate the signaling head into various positions.
This is particularly necessary when the signaling 15 At some convenient place in the Vessel, for exam
pic, on the bridge or in the radio room, there is
device has a strong directional characteristic such
present invention relates to an apparatus for ro
tating a heavy device into a desired position from
a remote point.
as‘is the case with a compressional wave trans
mounted a handwheel 8 at the end of a shaft 9.
A gear I0 is ?xed to the shaft 9 and meshes with
mitter or receiver whose diaphragm is large in
a gear H ?xed to the shaft l2. Also ?xed to the
comparison with the wave length employed. For
this purpose it is necessary to be able to rotate 20 shaft I2 is a dial E3 the front view of which is
shown in Fig. 3. Also ?xed to the shaft 9 is a
the signaling head into any desired position with
gear [4 which meshes with gear I5 ?xed to shaft
considerable accuracy.
.
l6 which carries an inertia mass I‘! to prevent too
Heretofore the most accurate way of accom~
rapid a turning of the handwheel B. At the end
plishing this has been by means of a hydraulic
of shaft 9 there is ?xed a gear l8 forming part
control arrangement. However, hydraulic de
of a di?erential system which includes also the
vices are extremely expensive and a cheaper con
idler gear I9 and the gear 29. The idler gear
trol system is very much desired. Electric motor
carrier I9’ is ?xed to the end of shaft 2| 'while the
driven arrangements have also been used, ‘but
these have been open to a number of objections. . gears 2i! and 39 are fastened to each other, but
They have not permitted a sumciently accurate 30 free to revolve on the shaft 2|. At the opposite
end of shaft 2! there is mounted a cam 22 carry
and close setting of the signaling device and have
ing the arms 23, 24, whose ends are provided with
been rather erratic in behavior in that it has not
rollers 25 and 26, respectively, adapted to make
been possible to obtain a smooth flow of power
to rotate the signaling device. Furthermore, it . contact with resistance windings 21 and 23
has not been possible at a reasonable cost toob 35 wound around an insulating ring 29 ?xed to the
support 29a.
tain a variable operating speed with full torque
An elevation of this variable resistance device is
at low starting speed or variable speed with full
shown in Fig. 2 from which it will be noted that
torque.
each of the resistances 21 and 28 are circular in
According to the present invention there is pro
vided an improved electrical system for control 40 shape and extend over approximately ninety de
grees of arc. Furthermore, it will be noted that
ling the rotation and position of a signaling head;
they are so arranged that the roller 25 can make
and for controlling the motion and position of
contact only with the resistance 2'! and that roller
any massive device. such as, for instance, a gun
26 can make contact only with resistance 28. stops
or a bridge or the like. Furthermore, the present
invention provides a variable speed device with 45 30, 3! and 32 being provided on the support 29c
and on the arms 23 and 24 to limit the rotation of
full torque available at all speeds.
these arms. It will also be noted that the re
The present invention will best be understood
sistances are arranged so that only one of the
from the following description with. reference to
rollers is in contact with its resistance at a time.
the accompanying drawings in which Fig. l is a
schematic representation of the mechanical ele 50 Thus, as shown in Fig. 2, while the roller 25 is in
contact with the resistance 21, the roller 26 is
ments of the system; Fig. 2 is an elevation of an
bearing against the insulating ring 29. This var
adjustable resistance device which is shown part~
iable resistance serves to control the operation of
ly in section in Fig. 1 and is employed in the
the gaseous electron tubes 33, 3t, shown in Fig. 1i,
modi?cation shown in Fig. 4; Fig. 3 is an eleva
tion of the control Wheel and scale; Fig. 4 is a 55 as will be described later.
3
2,406,865
As mentioned above, a gear 5 is rigidly ?xed to
the signaling head shaft 2 and rotates with it.
Meshing with the gear 5 is a gear 35 which is
?xed to the shaft of a self-synchronous gener
ator 35. The ratio of gear 5 to gear 35 is the
same as that between gears H and Ill, respec
tively. The self-synchronous generator 36 drives
the selfmsynchronous motor 31 which, through
ode circuit of the tube 33 also contains a current
limiting resistor 57 and a choke 58 in series with
the secondary 55.
Likewise, the grid cathode
circuit of the tube 34 contains the current~lim~
iting resistor 59 and the choke 60 in series with
the secondary winding 56. These elements t0~
gether with the resistances 21 and 28, which are
introduced into the circuit by the operation of the
gears 33 and 39 of a one to one ratio, rotates the
arms 23 and 24, form phase~shifting networks
arms 23 and 24.
10 for varying the phase of the grid-~cathode volt“
The operation of the mechanical parts of the
age with respect to the anode-cathode voltage of
system just described is brie?y as follows: When
each of the two tubes 33 and 34. As is known,
the handwheel 8 is turned to set the dial l3 to
by varying the relative phase between the grid
the desired bearing of the signaling head, the
and anode voltages, it is possible to vary the
arms 23 and 24 are rotated to cause one of the 15 length of time in each cycle during which the
rollers to make contact with its resistance, there
discharge tube is conductive whereby the average
by operating one of the gaseous electron tubes 33
anode current is varied.
or 34 and causing the motor ‘I to rotate in the
It has been customary, however, to bring about
proper direction. The rotation of the signaling
the phase shift of grid voltage progressively in
head by the motor also rotates the self~synchro~
the opposite direction from that of the passage
nous generator 36 which reacts upon the motor
of time as determined by the anode potential,
3'! which, in turn, tends to turn the arms 23 and
whereas in the present invention the progressive
24 back to their original position which will. be
phase shift occurs in the same direction as the
reached when the signaling head I faces in the
passage of time. Also, in the present arrange
direction indicated by the setting of the dial [3. 25 ment the anode circuits contain the armature of
The operation of the motor 1 and its control
the shunt motor ‘I. When the armature revolves,
will be evident from a consideration of Fig. 4.
The motor 7 is of the type generally used as a
direct current shunt motor. It has an armature
a back E. M. F. will be developed in its windings
which will oppose the applied alternating volt~
age during one-half of the cycle and will aid it
40 and a ?eld winding 4| which, however, is sep 30 during the other half of the cycle. Furthermore,
arately excited from a source of direct current.
the back E. M. F. will oppose the alternating
Its armature 40 is in series with a source of alter
voltage during that portion of the cycle in which
nating current and with the anode~cathode cir~
one of the discharge tubes is conductive and dur~
cuit of either of the electron tubes 33 or 34 de
ing which current ?ows through the armature.
pending upon the position of the relay 42. The
This has the effect of limitingr the maximum
tubes 33 and 34 are three-electrode electron tubes
speed at which the motor 4|] will run with any
of the gaseous type.
given setting of the variable resistance device.
When the moving arm 43 of the relay connects
with contact 44 as shown in Figure 4, the arma
ture 40 is in series with the anode of the tube
33, while when the relay coil 42 is deenergized,
its moving arm 43 will be in connection with con~
All this will better be understood by a con»
sideration of Fig. 5 in which various voltages are
plotted as ordinates against time as abscissae.
If we assume that the arms 23 and 24 of the
variable resistance are in such a position that
tact 45, thereby placing the armature 40 in series
they both contact only the insulating ring 2?},
with the anode of tube 34. It will be noted that
which would be in a vertical position in Fig. 4,
when 43 contacts 44, current impulses will flow 45 the alternating potential applied tothe grid of
through the armature 40 in one direction while
when 43 contacts 45, current impulses will ?ow
through the armature in the opposite direction.
The coil 42 of the relay is energized when the
contacts 46, 41 are closed by the cam 22.
each tube will be 180 degrees out of phase with
the anode potential of that tube as indicated by
the curve E91. The anode voltage is illustrated
by the curve E19. Since in order for either tube
This 50 to discharge, it is necessary that the grid voltage
occurs when the arm 23 makes contact with re~
sistance 2‘! whereas the contacts 46, 51 are open
when the arm 24 makes contact with the resist‘
ance 23.
be above a certain minimum, which we may as»
sume for the purpose of this discussion to be
zero volts, it will be evident that neither tube
can discharge under these conditions, and conse
The cathodes of the tubes 33 and 34 are sup 55 quently the motor ‘I will remain at rest.
plied with energy from the alternating current
If, now, the handwheel be turned so that one
source through a transformer having a primary
of the arms makes contact with its resistance,
winding 48 and two secondary windings 49 and 50,
say, as shown in Fig. 4, so that the arm 23 makes
the cathode of tube 33 being supplied from the
contact with resistance 21, the contacts 46 and
secondary winding 49 while the cathode of tube 60 47 will be closed by the cam 22 and consequently
34 is supplied from the secondary winding 50.
the relay coil 42 will be energized closing conThe anode circuit of tube 33 is returned to its
tacts 43 and 44 and opening the anode circuit to
cathode by means of the conductor 5| which is
the tube 34. Under suitable conditions, tube 33
connected to a center tap on the secondary
can then operate, while tube 34 is isolated from
winding 49. Likewise the anode circuit of the 65 the circuit. The alternating potential which is
tube 34 is returned to its cathode by means of
now applied to the grid of tube 33 is less than
the conductor 52 which is connected to a center
180 degrees out of phase with the anode poten
tap on the secondary winding 50.
tial of that tube as indicated, for example, by
The grid cathode circuits of the tubes 33 and
the dotted curve Egg. Let us assume that the
34 are energized through the transformer 53 70 minimum anode potential required to effect a
which is supplied from the same source of alter
discharge of the tube is the value a, as indi
nating current as the anode circuits. The trans
cated by the line Ep(minimum). It will now be seen
former 53 has a primary winding 54 and two
that in a positive half cycle of anode voltage, as
secondary windings 55 and 56, each of the latter
indicated by the curve Ep, when the anode Volt
being provided with a center tap. The grid cath
age reaches the value a, the grid voltage Egg is
2,406,855
6
5
still positive. At this point, therefore, the dis
charge will take place and anode current will
flow through the armature 40 to the end of the
positive half cycle when the anode voltage again
becomes negative. In the latter condition the
tube cannot, of course, conduct current since it
is a uni-directional device, but in the succeeding
positive half cycle, the same effect will again 00our. The armature 40 will, therefore, be ener
gized with uni-directional current impulses caus
ing it to rotate.
As the armature gains in speed, a back E. M. F.
will be generated. Now. it will be noted from
Fig. 5 that at the instant the anode voltage
is again moved back to its original position, mak~
ing contact with the insulating ring 29, at which
time the grid voltage of tube 33 will again be
exactly 180 degrees out of phase with its anode
voltage so that current can no longer flow,
through the motor armature which consequently
will cease turning.
Should the inertia of the parts be such that
the motor revolves the signaling head 1 beyond
the desired position, the self-synchronous motor
31 will likewise rotate the arms
24 beyond the
insulating segment 29 so that the arm 24 makes
contact with the resistance 7.8 and also causing
the contacts 46, 4'! to open and thereby to de
reaches the value b, the grid voltage Egz has
energize the relay 42 which permits contacts
reached zero.
43, 45 to close. The tube 34 is, therefore, ener
gized to rotate the motor in the reverse direc
tion to bring the signaling head back into the
Therefore, the back E. M. F. can
increase until it has the Value —(b-a), for if
it becomes greater than this, no further current
impulses will be supplied to the motor armature,
wherefor its speed will decrease. This is because
desired position.
a back E. M. F. of the value —(b—a) is su?i~
cient to reduce the anode voltage to its minimum
at the very ?rst turning of the handwheel from
permissible value at the instant the grid voltage
It should be noted that the resistance 21 (or
28) is varied from an in?nite to a ?nite value
its position of rest. Upon continued turning of
the handwheel, the resistance is ?nally gradually
reaches its minimum value so that no discharge
of the tube occurs. If, now, the arm 23 were 25 reduced to zero. Now, since maximum torque is
turned still further in a clockwise direction, the
grid voltage curve Egz would be displaced still
more to the right in
5 and consequently the
back E. M. F, and therefore also the speed of
the motor could build up to a higher value than 30
previously.
'
It should be noted that the progressive phase
shift of grid voltage with respect to anode voltage
developed by the motor while the resistance is
near its maximum ?nite value, as explained
above, it is highly desirable to place a limitation
upon the speed with which the handwheel is
turned so as to give the motor time to set the
signaling head into rotation while maximum
torque is still available. This is the function of
the inertia weight I1, shown in Figure 1, although
any other suitable device may be substituted for
in starting the motor is in the same direction as
the passage of time as determined by the anode 35 limiting the speed at which the handwheel 8 can
voltage, as shown in Fig. 5. This is made pos
sible by choosing the correct polarity for the
primary of transformer 53, and results in the ap—
plication to the motor of maximum power. The
motor consequently develops maximum torque on 40
starting.
be turned, particularly at starting.
On the other hand, the resistances can be tam‘
pered or arranged in steps of any desired mag
nitude in order to obtain any desired speed at
the various settings of the resistance control arm.
It may, for example, be desired to have the motor
rotate extremely slowly near the position of bal
From the above it will be evident that the tube
ance and when the handwheel is only very
33 with the phase shift control of its grid voltage
slightly displaced while much faster rotation is
in combination with the shunt motor 1 offers an
to occur when the handwheel is displaced a
arrangement for obtaining a variable motor
greater amount. For this purpose the resistance
speed with full torque at starting which obvi
variation is made small near the position of bal
ously may be useful in a number of instances
ance and is made to reduce rapidly for greater
other than the example herein given. It is par
displacements of the resistance arm.
ticularly useful where the inertia of a heavy mass
The handwheel 8 need, of course, not be man
50
must be overcome in order to set it in motion.
ually operated, but it can be controlled by an
Referring again to Fig. 4 it will be evident that
automatic device, such as, for example, a gyrowhen the arm 24 makes contact with the resist
compass in order to keep the device I facing in
ance 28, the contacts 46, 41 will be opened and
a desired direction.
contacts 43, 45 closed, whereby the tube 34 be
The system shown in Figs. 6 and '7 is in many
comes active to rotate the armature Ml in the
ways superior to the arrangement shown in Fig.
reverse direction from before. The control of
4. The modified arrangement is considerably
the potential of the grid of tube 34 is similar
simpler in as much as one of the transformers
to that described with reference to tube 33 and
and the chokes are eliminated. Furthermore, a
the back E. M, F. generated in the armature of
very smooth control of the'signaling head or of
the motor ‘I likewise brings about an automatic
speed variation can be obtained.
limitation of the motor speed. The system as de'
In Fig. 6 the motor 1 is likewise of the direct—
scribed, therefore, not only provides a 'motor
current shunt motor type having its ?eld wind
speed control, but also provides this control for
ing 52 separately excited from a direct-current
both directions of rotation.
source. The gaseous electron tube 63 has its
In the system as applied to the rotation of the
anode-cathode circuit supplied with alternating
signaling head shown in Fig. 1, it will now be
current and contains the armature 6! of the mo
understood that when the handwheel has been
tor ‘l in series with it. A relay 65 is provided
rotated to set the dial 13 in a given position which
which is a double-pole, double-throw relay and
may result, for example, in setting the arm 23
on the resistance 21, as shown in Fig. ‘l, the 70 serves to reverse the connections of the armaa
ture SI of the motor ‘I. The potential applied
motor 1 will operate to rotate the signaling head
to the grid of the tube 63 is obtained from the
I into the desired direction. At the same time,
- however, the self-synchronous generator 36 is
being rotated and is effecting a rotation of the
direct current source through the current~limit
ing resistor 64 and the variable potentiometer
self-synchronous motor 31, whereby the arm 23 75 resistance 66. This resistance may be uniform or
7
2,406,855
tapered or stepped as mentioned above with re
spect to the resistances ‘.27 and 28 of Fig. 1i.
A. convenient mechanical form of the latter is
shown in Figure 7. This variable resistance is
mounted on the shaft 2! in Figure 1 in place of
the device there shown and described in connec
tion with Figure 4. The contact arm 61 normally
makes contact with a conducting segment 68
mounted upon a suitable disc of insulating ma
terial 59. On either side of the segment 68 are
the resistances "ill and "H with which the arm 6'!
makes contact when it is moved to one side or the
other of segment
A cam 72 is also provided
?xed to the shaft 2! so that it rotates with the
arm 67. The cam ‘i3. is arranged so that the con
tacts l3, W1 are open when the arm til engages
the segment 63 as well as while it engages the re
sistance ll. On the other hand, the contacts 73,
M are closed while the arm 6'! engages the resist
8
below the critical potential and consequently to
_cut off conduction through the tube. Thereupon
the armature ill, no longer being supplied with
current impulses, tends to slow down and the
back E. M. F. consequently decreases to a point
where it is no longer sufficient to neutralize the
applied positive grid potential whereupon the
tube again becomes conductive. This phenome
non is repeated and results in the armature at
taining a constant speed determined by the set
ting of the arm ll'l along the resistance ‘Ill or ‘II.
It will be evident that not only at starting but
also at all speeds full torque is available, the ar~
mature being supplied with current impulses just
sufficient in number to keep its speed at the value
determined by the setting of the resistance 66
and the back E‘. M. F. developed by the armature.
As applied to the rotation of the signaling
head, it has already been mentioned that the
arm 61 is to be ?xed to the shaft 2| of Figure 1.
Thus, when the handwheel 8 is displaced in order
to change the position of the signaling device
ance ‘Hi. When the contacts 13, ‘M are closed,
the coil "E5 of the relay
is energized from the
direct current supply, thereby connecting the ar
mature ii! in the anode-cathode circuit of the
I, the arms 5'! will be moved onto one or the
tube in one direction; but when contacts ‘l3, ‘l4
of the resistances ‘Ill, ‘H and will be moved
open, the relay coil is doenergized and the 25 other
along the resistance by an amount depending
armature is connected in the anode circuit in the
upon the amount of change of position which
reverse direction. Since current always ?ows
is desired as indicated on the dial coupled to the
through the anode circuit in the same direction,
handwheel 8. The subsequent rotation of the
the motor armature will rotate in one direction
motor ‘l in turning the signaling device into the
0 the other, depending upon whether the arm
desired position also brings about the rotation
s
contact with the resistance “Hi Or with the
of the se1f~synchronous generator 35 and the
s'istancc ‘H.
self-synchronous motor 31, \ ch through gears
The outer ends of the resistances Hi and ‘H are
38 and 39 operates to return the arm. E57! toward
connected to the source of direct current while
the segment 68 which will be reached when the
the inner ends, nav ely those adjacent to the
signaling device has been rotated into the proper
segment 68, are connected together and through
position. When this position is reached, the
a high resistance to the segment lit and thence
motor stops.
through. the resistance l'li to the cathode of tube
Since the motor speed is dependent upon the
The gr'l cathode circuit of the tube thus
position of the arm 67 on the resistance ‘It! or "H
traced from the id of the tube through V as explained above, it will be understood that
' ...- resistance 534 to the
in Ell. Then when the
as the signaling device approaches the desired
arm
in contact with segment
the circuit
continues through resistances "ll and iii to the
cathode, and when the
is in contact with the
position and consequently as the arm ?ll ap
proaches the segment 58, the motor speed gradw
ually reduces, so that the signaling device comes
resistances ‘is or ll, the circuit continues through 45 to a smooth stop. There is substantially no teud~
a portion of the respective resistance to the re
ency for it to overshoot the desired position,
sistance Ill and the cathode of the tube. It will
be noted that the resistances "ill and ‘H are each
potentiometers connected across a source of (ii
although if it should do so, the motor will re~
verse at slow speed to return to the correct posi-~
tion. Extremely accurate settings can be made
reel: current, their outer terminals being positive 50 with the added advantages of high speed for
and their inner terminals negative. Thus, as the
large position changes, low speed for small
i G? is moved outward, away from the segment
changes, full torque at all speeds; and at the
along either of the resistances N or ‘H, the
sulting
same time
in low
the manufacturing
apparatus required
and ismaintenance
simple,
d of tube E3 becomes more and more positive
with respect to the cathode.
costs.
[is soon as the grid of tube 63 becomes positive,
The arrangement shown in Figure 4 employs
the tube will become conductive and uni-direc
be
twodispensed
tubes, butwith
it is by
evident
replacing
that the
one relay
of these
$2 with
tic-pal, current impulses will flow in the anode
circuit through the armature 6| causing it to lo
a double-pole, double~throw relay arranged in
tate. The rotation of the armature in the direct 60 a manner similar to that shown in Figure 6.
current ?eld produced by the winding 62 causes
While my invention has been described chie?y
a back E. M. F. to be induced in the armature
as
desired
applied
position,
to a system
it has for
been
moving
mentioned
a body
that
intomy
winding. The armature, it will be noted, is con
nected through the conductors l8 and Til across
invention also provides a variable speed d ' '
the terminals of the resistance ‘l6 which is in the
system. As such, it can readily be app]
to
grid cathode circuit as above described. The
the operation of machines at desired variable
back E. M. F. is thus impressed across this resist»
speeds. In this case it will be understood. of
ance and is in the opposite direction to the grid
course, that the coupling between the moved de
cathode potential supplied through the resist
vice and the resistance device represented in
ance ‘ill or ‘H. As the armature El speeds up un»
der the influence of the anode current, the back
M. F. builds up to a greater and greater value
until it is su?‘iciently high to neutralize the grid
potential supplied through the resistances l0 and
"H and thereby cause the grid potential to fall
Figure
and
ill’ and
1 by the
theattendant
self-synchronous
gearing can
machines
be ornit
ted.
It will also be evident that any desired
sequence of fast or slow operation can readily
be obtained by suitably proportioning the steps
into which the resistance means are divided and
2,406,855
10
the manner in which the contacting arm is moved
over them.
Having now described my invention, I claim:
1. In a submarine signaling system having a
signaling head, means for controlling the posi
tion of said signaling head including in combi
nation with said signaling head, a shaft on which
said signaling head is mounted, an electric mo
tor for rotating said shaft and means for con
trolling the operation of said motor including
a differentially controlled rotary system having
means for controlling the speed and direction of
rotation of said motor, said means having a point
of stationary balance, means adapted to be rotate-d
in one direction to rotate said shaft and signaling
head clockwise and adapted to be rotated in a
reverse direction to rotate said shaft counter
clockwise, and a follow-up device operative
through said rotary system to bring said means
for controlling the speed and direction of rota
tion of said motor to said point of stationary bal
ance for each operation of positioning said signal
ing head.
2. In a submarine signaling system having a
signaling head, means for controlling the position
of said signaling head including in combination
with said signaling head, a shaft for turning the
same, an electric motor for rotating said shaft.
4. In a submarine signaling system having a
signaling head, means for controlling the position
of said signaling head including in combination
with said signaling head, a shaft for turning
the same, an electric motor for rotating said
shaft, a control switch means for starting and
stopping said motor and controlling the direc
tion of rotation thereof and a differential system
operating said control switch means, said sys
tem including means for manually turning said
control switch in either direction, means for
returning the control switch to its normal posi
tion, said means including means operatively
associated with the signaling head shaft, said con
trol switch including means for applying direct
current impulses to said motor, the direction of
said impulses controlling the direction of rota
tion of the motor.
5. In a submarine signaling system having a
20 signaling head, means for controlling the posi
tion of said signaling head including in combina
tion with said signaling head, a shaft for turn
ing the same, an electric motor for rotating said
shaft, 2. control switch means for starting and
stopping said motor and controlling the direc
tion of rotation thereof and a differential sys
tem operating said control switch means, said
system including means for manually turning said
means for controlling the operation of said mo
control switch in either direction, means for re
tor and the position of the signaling head includ
ing a control switch for starting and stopping said
motor and controlling the direction of rotation
thereof and differential rotary means for oper—
ating said control switch, said means having
means manually operative to turn the control
switch a desired amount in one direction and also
having means operating through the signaling
head shaft to return the control switch the de—
sired amount advanced.
3. In a submarine signaling system having a
signaling head, means for controlling the posi~
tion of said signaling head including in combi
nation With said signaling head, a shaft for turn~
ing the same, an electric motor for operating said
turning the control switch to its normal position,
said means including means operatively asso
ciated with the signaling head shaft, said control
switch including means for applying direct cur
rent impulses to said motor to rotate the motor
in the direction desired.
6. In a submarine signaling system having a
signaling head, means for controlling the posi
tion of said signaling head including in combi
nation with said signaling head a shaft on which
shaft, a control switch means for starting and.
said signaling head is mounted, an electric motor
for rotating said shaft, means for controlling the
operation of said motor including means having
a neutral position but adapted to be rotated in one
direction to operate said motor for rotation of
said signaling head clockwise and adapted to be
stopping said motor and controlling the direc
tion of rotation thereof and a differential system
operating said control switch means, said sys
rotated in a reverse direction to operate said
motor for rotation of said signaling head coun
ter-clockwise, said means including a follow-up
tem including meansfor manually turning said
device operatively associated with the rotation
of said signaling head to cause said rotatable
means to be returned to its normal neutral posi
tion.
HOWARD A. SATTERLEE.
control switch in either direction, and means
for returning the control switch to its normal
position, said last means including means oper
atively associated with the signaling head shaft.
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