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.-l7,1946.
2,412,605
G. F. DRAKE
SPEED ADJUSTING MECHANISM
Filed Feb. 5, 1943
3 Sheets-Sheet l
Eiyl,
INVENTOR
' George Forrest Drake
I %.M
ATTORNEYS
Dec. 17, 1946.
G, F, DRAKE
2,412,605
SPEED ADJUSTING MECHANISM
Filed Feb. 3, 1945
3 Sheets-Sheet 2
INVENTOR
George Forrest .Dra/(e
BY
-
-
I
ATTORNEYS
Dec. w, 194%
G. F?. DRAKE
2,412,605
SPEED ADJUSTING MECHANISM
Filed Feb. 3, 1943
3 Sheets-Sheet 5
"/04
\N G
m
740
INVENTOR
George Forrest Dre/(e
BYE-44.,
Kym/21a?:
ATTORNEYS
Patented Dec. 17, 1946
2,412,605 '
UNITED STATES PATENT OFFICE.
2,412,605
_
SPEED ADJUSTING MECHANISM
George Forrest Drake, Rockford, Ill., assignor to
Woodward Governor Company, Rockford, 111.,
a corporation of Illinois
Application February 3, 1943, Serial No. 474,549 .
11 Claims. (CI. 60-97)
2
This invention relates generally to mechanisms
for adjusting the speed setting of a governor or
other regulating device from a remote point of
control, and in certain of its aspects relates to
improvements in a synchronizing mechanism of
the general character disclosed in my copending
l2 rotatable with the propeller and operating on
the follower l3 of a cam ill which, through bevel
gear connections, turns the propeller blades on
their longitudinal axes.
The governor includes a rotary head l5 piv
application Serial No. 525,913, ?led March 10,
1944, to which this application is subordinate,
otally supporting fiyballs l6 having arms I?! bear
ing upwardly against the head l8 of a valve rod
l9 which is urged downwardly by an adjustable
said application Serial No. 525,913 being a con
speeder spring 28. The head I5 is on the upper
tinuation-in-part of application Serial No. 10 end of a sleeve 2i journaled inthe governor
casing and driven from its lower end through a
426,362, ?led January 10, 1942, the latter now
gear connection with the engine crankshaft 23.
'
The valve rod [9 has spaced lands 24 and 25
One object is to combine a speed adjusting
thereon coacting with ports in the sleeve 2| and
mechanism'for a plurality of prime movers with
a novel means for effecting automatic synchro 15 shiftable upwardly? by the ilyballs in response
to a speed increase above the prevailing speed
nization of the prime movers.
setting to admit pressure fluid from a supply,
A further object is to incorporate in such a
line 28 to a conduit 29 leading to the rod end
combined adjusting and synchronizing control a
of the servo motor cylinder. The servo piston
novel means for rendering the synchronizing con
trol operative and inoperative automatically as 20 moves to increase the propeller pitch until the
valve is again closed as shown in Fig. 2. In re
an incident to starting and stopping of the man
ually operable adjusting mechanism.
sponse to a speed decrease, the valve rod is low
ered permitting the flow of fluid out of the servo
Other objects and advantages of the invention
through the conduit 29 past the land 25 to the
will become apparent from the following detailed
description taken in connection with the accom 25 sump. The propeller pitch is thus decreased
panying drawings, in which
until the speed reduction has been corrected for.
Oil under the proper pressure is supplied to the .
Figure 1 is a schematic view and wiring dia
line-28 by a, booster pump 30 driven from the
gram of the improved speed adjusting control.
rotating sleeve 2i and supplied with oil by the
Fig. 2 is a schematic view of the speed adjuster
30 engine lubricating pump 3i.
for one power unit.
'
From the foregoing, it will be apparent that the
Fig. 3 is a vertical sectional view of the speed
abandoned.
governor operates automatically through the
pitch-changing mechanism to maintain the speed
selecting mechanism.
Fig. 4 is a section taken along the line 4-4
of Fig. 3.
'
of the engine constant and at a value determined
-
Figs. 5 and 6 are similar views showing differ
35 by the load imposed on the flyballs by the speeder
ent positions.
?The invention has been shownv in the drawings
spring 20. This load may be adjusted by turn
ing a pinion 32 meshing with rack teeth on a plug
33 which is mounted in the governor for move
and will be described herein as applied to the
ment axially of the spring.
speed control of a plurality of internal combus
tion engines M and S. It is to be understood, 40 In accordance with the present invention, the
pinion shaft 34 of the governor of the engine M
however, that I do not intend to limit the inven
is ?adapted to be turned by an electric motor 35
tion by such disclosure nor to the particular
mounted on the governor casing and acting
illustrated constructions of the various switch, I
through reduction gearing 36. This motor is on
governor, motor units and electrical transmitters, I
but aim to cover all modi?cations, alternative 45 the receiving end of an electrical transmitting
system controllable from a transmitter located at
constructions, and uses falling within the scope
a, point of manual control remote from the en
of the invention as expressed in the appended
gine. Herein, the motor is of the step type hav
claims.
ing a permanently magnetized rotor 31 adapted
The speeds of the engines M and S may be
controlled by individual governors ll arranged 50 to occupy any one of twelve well-de?ned angu
lar positions according to the combination of
to actuate the engine throttles or, as shown, to
effect the speed regulation byadjusting the pitch
of propellers l0 driven by the engines. This may
be accomplished by applying hydraulic pressure
controlled by the governor II to a servo motor 65
direct current potentials applied to three sets of
distributed windings 38 on its stator 39. When
the windings are deenergized, the rotor will come
to an abrupt stop.
3
Operation of the step motor in one direction
or the other is effected by turning the shaft 458 of -
of the commutator switch 58 and the step motor
52, beenbrought into synchronism with the mas
the transmitter which is a commutator switch it!
ter M.
having angularly spaced segments 62, �, and @113
To enable the di?erential motor 58 to be dis
abled at certain times as during the adjustment
engaged as shown in Fig. 2 by contacts 55, 56, �,
and 88.
These are arranged in pairs respectively
connected to the di?erent polar terminals ofha
_
~of the engine speeds under manual control, the '
switches 66 and 67 are connected to the arma
-battery d8 through conductors 58' and 5t. T e
ture of a magnetic relay 68 interposed in a cir
segments are connected directly to the windings
cuit extending from one power lead 58 through
of the step motor 35'through suitable brushes 10 one or more normally closed manually operable
and conductors 563. The construction of the step
switches 69, a conductor '58, the relay'coil 58,
motor is such that as the switch shaft ?38 turns
one or more normally open switches it ?connected
in one direction, the windings of the ?step motor
in parallel, and a conductor ?l3 connected to
will be energized in successive combinations caus
the other power lead 5|. When the relay coil
ing the rotor 67 to follow the movements of the 15 is energized by closure of one of the switches
switch shaft. Reverse operation of the motor
?ll, the switches 66 and 67 will be closed and the
takes place when the commutator switch is
differential motor 68 will be rendered operative.
turned in the opposite direction. ,
Such operation of the relay also results in clo
The governor of the engine S is similarly
sure of a- switch ?12 which completes a holding
adapted for adjustment of its speeder spring by 20 circuit through the relay coil and the switches
a step motor 52 of the same construction as the
69. Thus energization of the relay 68 is main
motor 35. This motor is, in accordance with one
tained
until one of the switches 68 is opened
aspect of the present invention, adapted to be ' whereupon
the switches 66 and 67 are opened
energized alternatively either under the control
and the diiferential motor is disabled.
a, of the commutator switch M or of a commutator
To adjust the speed settings of the governors
switch 53 of the same construction also located
ll under manual control from a remote point,
at the remote point of control and having its parts
the shaft 48 of the transmitter or commutator
indicated by corresponding primed reference
switch
iii is connected to the shaft of a rever
numbers. The motor 52 may be connected to the
segments of the switch 58 through conductors 55 30 sible motor l3? preferably of the type having a
permanent magnet stator ?M and a wound rotor
including switches 56 or it may be energized from
75. The direction of operation of such a motor
the commutator switch 85 through conductors
may be reversed by reversing the current ?ow
57 and 57', the latter having switches 58 inter
through the rotor winding. Herein, this winding
posed therein. The movable contacts of the
is
energized selectively or deenergized by a mag
switches 56?and 59 are connected to the armature 35
of a magnetic relay 58 in a manner such that the
switches 56 are closed and the switches 58 are
open when the relay coil is deenergized, the con
netic reversing switch ?I6 operated differentially
- by the energization of coils 11 and '88. As shown,
_ the switch comprises a frame 19 pivoted inter
mediate its ends at 88 and adapted to be actu
dition being reversed when the coil is energized.
The battery leads 50 and 5| are extended to the 40 ated from opposite ends by the armatures of
stationary contacts of the switch 53.
.
In accordance with one aspect of the present
invention, one of the engines, in this instance M,
is selected as the master, and the speed of the
the magnets 71 and T8.
*
Projecting from the frame are spring arms 8!
which cooperate with stationaryv contacts to form
switches 82 and 83 which are both closed when
other or slave engine S is matched accurately by 45 both of the coils T! and 18 are deenergized. Arms
84 on the frame cooperate with stationary con
operation of the commutator switch 53 in direc
tacts to'form switches 85 and 86 which are both'
tions and amounts such as to correct for any
open when the coils 11 and 18 are deenergized.
departure of the slaveengine speed from that of
the master. The speed matching is effected by
a differential three phase motor or so-called dif
ferential Selsyn 68 comprising a thred'phase two
pole stator and a three phase two pole rotor hav
- ing windings 6i and 6|?, the rotor being fast on
The stationary contacts of the switches 82 and
50? 85 are connected by a conductor 81 to one ter-.
minal of the rotor winding while the contacts of 4
the switches 83 and 86 are connected to the
other terminal by a conductor 88. A conductor
the commutator switch shaft 48'. These wind
89 extendsfroni the arms 84 to one battery lead
ings are energized respectively by small perma 55 58 while a conductor 90 connects the other arms
nent magnet generators 62 and 63 respectively
8| to the other battery lead 5|.
mounted on the engines Mv and S and driven
The coils ?I1 and 18 are connected together
at one end and their insulated terminals are
thereby. Generators of the type suitable for this
joined by conductors 9| and 82 to contacts 93
purpose are disclosed in Patent No. 2,071,536.
The generator 63 is connected to the rotor wind 60 and 84 of two control switches 95 and 96 (Fig. 4)
. ing 6|? by conductors 65 including switches 66
having a common intermediate contact 91 con
while vswitches 61 are included in conductors 68
nected by a conductor 98 to the battery lead 50.
leading from the generator 62 to the stator wind
It will be apparent that when the coil 11 is .en
ing 6|.
'
ergized, the frame 18 will .be pushed downwardly
With both windings energized and the engines 65 and tilted counterclockwise about the center 80
M and S running at the same speed, the fre-'
opening the switch 82 and closing the switch 85
quencies of the two currentlsources will be iden
so that current ?ows through the motor? 13? from
tical so that the rotor shaft 48' will not turn.
the lead 58, conductor 89, switch 85, conductor
When thespeeds of the master ?and slave en
81, rotor 15, conductor 88, and switch 83 to the
gines are di?erent, the frequencies of the cur 70 lead 5!. Current ?ows in the reverse direction
rents supplied by the respective generators will
through the switches 82 and 86 when the coil
di?er proportionately, and the di?erential rotor
18 is energized tilting the frame 79 clockwise.
shaft will turn in ?a direction? determined by
When both coils TI and 18 become deenergized,
which frequency is higher. Such operation will
the switches 82 and 83 both close thereby short
continue until the slave engine has, by operation 75 circuiting the rotor 15 to produce abrupt stop
2,412,605
5
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6
ping of the commutator'switch 4| and therefore
gine speed any desired number of revolutions sim
of the step motors controlled thereby.
ply by changing the position of the lever the same
I
In. accordance with the present invention, the
motor is started in one direction or the other by
movement of a manually operable member I00
to a position corresponding to a newly selected
speed setting where the member is retained, fric
tionally in this instance, and operation of the
motor continues until the governors II have
reached the selected speed setting whereupon the
motor will be stopped automatically. While the
manually operable. member may take various
forms, it is shown herein
lever fast on a shaft IOI
and projecting from one
which houses the motors
number of revolutions as read on the scale I00.
_With the switches 95 and 96 thus arranged, the
motor ?I3? will be idle when the cam notch II?!
is positioned opposite the roller II3 as shown in
Fig. 1, both switches?then being open. Now, if
the lever I00 is turned clockwise as shown in Fig.
5 to select a new speed setting, the arm I01 and
the contact 9?! thereon will engage the contact
94 and carry the latter and the arm I09 along
with the lever, the roller II3 riding up the in
cline II5 after the contact engagement occurs.
as comprising a hand
which is journaled in
The relay coil ?I8 and the relay 58 are thus en- '
wall of a casing I02 15 ergized to start the motor and also connect the
00 and ?I3?, the com
step motor 52 tothe commutator switch 4|. The
mutator switches AI and 53, and the-relays 58,
motor runs the switch shaft 40 in a direction to
68, and ?I6.v This lever may be mounted in any
convenient location within the reach of the op
erator or pilot.
Rotatable with the shaft IOI is a disk I03
which is urged by a, compression spring I03?
against a stationary'plate I04 to create the fric
tion necessary to hold the lever I00 in?any-se
lected position while permitting the lever to be
swung manually in either direction. A pointer
I05 on the lever coacts with a scale 606 to in
dicate the speed setting'in revolutions per minute
change the speed settings of both governors II
to correspond to the newly selected speed and at
20 the same time .to turn the cam H4 in a direction
to follow up the movement of the arm I0?_I and
advance the notch II'I toward the roller II3.
In .this operation, the selected position of the
lever I00 and the contact 94 are maintained by
the friction created between the disk I03 and the
plate I04, and the incline II5 acts on the bell
crank H2 to prevent opening of the switch 99
until the cam H0 has been turned sufficiently
or other units Mounted on an arm I01 project
to present the notch iI?I opposite the roller II3.
ing upwardly from the disk I03 are the common 30 As the latter becomes centered in the notch as
contacts 9?! which are disposed between spaced
lugs I08 carrying the contacts 93 and 94 and pro�
jecting rearwardly from an upwardly projecting .
arm I09. The latter is on a loose bushing IIO
shown in Fig. 6 with the lever in its new position,
the arm I09 is moved by the spring II 9 to cause
the contact 94 to disengage the lever contact 91
thereby opening the switch 9E5v and stopping the
on the shaft WI and carries the pivot III of a 35 motor ?I3?.
, bell crank II2.
A roller II3 on one arm of the
bell crank constitutes the follower of a heart
shaped cam II4 having gradual rises H5 and
H6 on opposite sides of a notch II?!. A spring
II9 acting between the bell crank and the arm
I09 holds the roller in contact with the cam sur
Thus, the extent of motor operation
is determined by the selected position of the lever
I00 and this without the necessity of the pilot
holding the lever to retain the selection.
The same operation? takes place when a reverse
speed setting is selected by moving the lever I00
in the opposite direction. In that case, the
switch 95 is closed and the relay coil 11 is ener
gized along with the relay 58 so that the motor
are disposed out of engagement with the con
13' and the step motors 35 and 52 run reversely
tacts 93 and 94 as shown in Figs, 4 and 6. ' When 45 changing the speed settings of the governors cor
the roller is engaging either incline, the contacts
respondingly until the incline I It has moved past
93 and 94 are shifted relative to the arm I01? and
the roller I I3 and the latter has become centered
one or the other is pressed against one contact
in the notch II?I. At this time, the switch 95
91. The cam H4 is fast on a sleeve H9? which
opens, stopping the motor ?I3? and simultaneously
carries a gear I I9 driven through reduction gears
disconnecting the step motor 52 from the com
I20 to I21 from a pinion I20 on the shaft I40 of
mutator switch GI while connecting it to the
the motor ?I3?. The direction of this drive is al
commutator switch 53. By actuating the relay
ways such as to move the notch II?! of the cam
switches 56 and 59 automatically as above de
back toward the follower roller~I I3.
scribed in response to energization of the motor
It will be observed that the two arms I01 and
?I3? for operation in either direction, the adjust
M9 are swingable about a common axis and are
ing step motors for both the master and ?slave gov
adapted for the limited degree of relative move
emors will be adjusted simultaneously and all of
ment required to actuate the switches. The cam
the associated engines will be brought rapidly to
H4 and its follower provide a connection between
the speed selected by positioning of the single
the arm I09 and the cam shaft which is adapted
lever I00. Thus, the lever, the step motors 35 and
to yield in either direction after closure of one
52, .the commutator switch 4 I, the motor ?I3?, and
switch and permit both arms to move in unison
the control for the latter may be utilized as a
face. The arrangement is such that when the
roller is disposed in the notch, the contacts 91
to the selected switch position. Thereafter, the
I cam operates to determine the extent of separa
remotely controlled mechanism for adjusting the '
speeds of all of the engines during take-off and
tion of the motors and therefore the amount of 65 landing, or to change the engine speeds to be
adjustment of the speed regulator or governor.
maintained during automatic synchronizing.
This action is obtained by correlating the gear
Such synchronizing may be effected in the
trains and other parts so that the range oi mo
present instance simply by the addition of the
tion of the hand lever corresponds to the range of
commutator switch 53, the differential motor 60
speed adjustment of the governor. That is to say, 70 and the generators 62 and 63. These become
a given change in the lever position will,- under
effective when the switches 66 and 61 are closed
the control of the switches and the transmitting
thereby completing the connections from the
system, produce a proportional change in the
movement of the governor adjusting plug. In this
way, the pilot may increase or decrease the en
generators to the differential motor 60 whereupon
the slave step motor 52 will be operated auto
matically to adjust the slave governor and match
2,412,605
~
3
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v
_
8
,
,
the speed of the slave engine against that of the
member, and means ?operable to shift the con
master.
mutator switch during operation of said driving
.
trol ofsaid slave step motor to said master com
a
The synchronizing mechanism is disabled au
tomatically while the engine speeds are being
adjusted manually. This is accomplished by dis
connection .of the step motor 52 from the com
mutator switch 4| automatically as an incident
to energization of the manually controlled ad
means in either direction and to said second com
mutator switch when said driving means is idle. -
3. A control for matching the speeds of slave
and master power units having, individual speed
regulators, said control comprising, in combina
tion, slave and master step motors each arranged
justing motor 16?. < The automatic control is re
? stored-automatically when the selected master 10 to actuate one of, said regulators, a master com
engine speed adjustment has been completed and
this, without further attention by the pilot.
To disable the automatic synchronizing mech
anism manually, it is only necessary to open one
of the switches 69 and thereby interrupt the hold
ing circuit for the relay 68. The resulting de
_mutator switch operable to control the master
step motor, a second. commutator switch, means
automatically responsive to di?erences in the
speeds of said master and slave units to actuate
15 said second commutatorswitch in a direction to
correct for such di?erences, motor driven means
for driving said master commutator switch,
?means operable selectively under manual control
energization of the latter disconnects the Selsyn
SE from the generators 62 and 63 until one of
to operate said driving means, and means oper
the switches ?H is again closed to reenergize the
relay 68 and reestablish automatic synchronizing. 20 able automatically to snift the control of- said
slave step moton to said master commutator?
switch during operation of said driving means
and to said second commutator switch when said
It will be observed that the number of slave
engines S to-be synchronized with the master
' M may be increased as desired simply by multi
plying the number of step motors, commutator
?switches, differential motors, generators, relays
53 and 68, these being connected in the control
circuits in the same ways as the corresponding
units shown.
I claim as my invention:
driving means is idle.
25
e. A control for matching the speeds of slave
and master power units having individual speed
regulators, said control comprising, in combina
tion, slave and master step motors each arranged
I to actuate one of said regulators, a master com
1. A control for matching the speeds of slave 30 mutator switch operable to control the master
step motor, a second commutator switch, means
and master power units each having an adjustautomatically responsive to differences in the
able speed regulator, said icontrol comprising, in
speeds
of said master and ?slave units to actuate
combination, slave and master step motors each
said second commutator switch in a direction to
arranged to actuate one of said regulators, a mas- '
correct for such di?erences, motor driving means
ter commutator switch operable to control the
for said master commutator switch, means op
master step motor and connectable selectively
erable selectively under, manual control to cause
to the slave step motor, a second commutator
operation of said driving means, and means op
switch connectable selectively to said slave step
erable automatically'to cause energization of said
motor, a differential motor'for driving said sec
ond commutator switch and operable selectively 40 slave step motor from said master commutator
switch alone during operation of said driving
in accordance with the differences in the speeds
means.
of said master and slave units, a reversible rotary
electric motor driving means for said master com
mutator switch, a? manually operable member
adapted to' remain in a manually selected posi
tion, switching means operable in response to a
' _
5. A control for matching the speeds of slave ,
and master power units each having an individual
45 speed regulator, said control comprising, in com
bination, remotely controlled means for adjust
ing the master speed regulator, means automat
change in the position? of said member to start
ically responsive to differences in the speeds of
said driving means and then continue the oper
said master and slave units to adjust the slave?
ation thereof until said master speed regulator
has been adjusted to a setting corresponding to 50 speed regulator and correct for such di?erences,
and means operable automatically during adjust
that selected by said member, and means oper
ment of said master speed regulator to-disable
able to effect energization of said slave step motor
said last mentioned means and cause adjust--v
from said master commutator switch during op
ment of the slave speed regulator in unison with
eration of said driving means in either direction
and from said second commutator switch when 55 the master regulator. 6. A control for matching the speeds of slave
said driving means is idle.
and master power units having individual speed
2; Av control for matching the speeds of slave
regulators, said control comprising, in combina
and master power units each having an adjust
tion, slave and master motors each arranged to
able speed regulator, said control comprising, in
combination, slave and master step motors each 60 actuate one of said regulators, synchronizing
means automatically responsive to di?erences in
arranged to actuate one of said regulators, a mas
the speeds of said master and slave? units to ac
ter commutator switch operable to control the
tuate the slave motor in a directionto correct for
master step motor, a second commutatorswitch,
such differences, motor driving means for con
a differential motor operable to drive said second
commutator switch in accordance with di??er 65 trolling the operation of said master adjusting .
motor in opposite directions, means operable se
ences in the speeds of said master and slave
lectively under manual control to operate said
units, reversible electric motor driving means for
driving means, and means operable automatically
said master commutator switch, a manually op
during operation of said driving means to cause
erable member movable independently of said
regulators, switching means operable in response 70 operation of the slave motor in a corresponding
direction independently of said synchronizing
to a change in the position of said member to start
means.
said driving means in a corresponding direction
'7. A control for matching the speeds of slave
and then continue the operation thereof until
and master power units having individual speed
' said master speed regulator has been adjusted
regulators, said control comprising, in combina
to a setting corresponding to that selected by said
2,412,005
10
tion, slave and master receiving motors arranged
means and cause operation of said receiving m0
to actuate the respective regulators,v a master
tors by said transmitter in a direction to move _
electrical transmitter operable to energize the
said regulators to settings corresponding to said
master receiving motor and cause rotation of
speeds, follow-up means actuated by said driv
ing means for continuing the operation thereof
the latter in unison with the transmitter, a sec
until the regulator setting selected by said mem
ond transmitter, means automatically responsive
ber has been attained, mechanism automatically
to di?erences in the speeds 0! said master and
responsive to a difference in the speeds of said
slave units to actuate said second transmitter in
master and slave power units to energize said
a direction to correct for such differences, motor
driving means for operating said master trans 10 slave speed regulator in a direction to correct for
such difference, and means operable automati
mitter and cause operation of said master motor
cally to maintain said mechanism disabled dur
selectively in one direction or the other, ?means
ing operation of said driving means and then to
operable selectively under manual control to cause
render said mechanism again operative.
operation of said driving means, and means op
10. A control iorlmatching the speeds of slave
erable automatically to cause energization of said 15
and master power units each having an adjust
slave receiving motor from said master trans
mitter alone during operation of said driving
able speed regulator, - said control comprising
slave and master receiving electric actuators ar
ranged to actuate the respective regulators, an
8. A control for matching the speeds of slave
and master power units each having an adjust 20 electrical transmitter operable to energize said
receiving actuators and cause rotation of the lat
able speed regulator, said control comprising
ter to adjust said master and slave regulators in
slave and master receiving electric actuators ar
means.
.
ranged to actuate the'respective regulators, an '
unison, electric motor driving means, means in
cluding a manually operable member shiftable
receiving actuators and cause operation of the 26 selectively to different positions corresponding to
speeds of said power units and operable. when
latter to adjust said master and slave regulators
electrical transmitter operable to energize said
' in unison, an electric motor, switching means
controlling the operation thereof, means includ
ing a manually operable member shiftable selec
moved to a new position. to energize said driv
ing means and cause operation of said receiving
motors by said transmitter in a direction to move?
tively to di?erent positions corresponding to speeds 30 said regulators to settings corresponding to said
speeds, mechanism automatically responsive to a
of said power units and operable, when moved to
a new position, to actuate said switching means
diii?erence in the speeds-of said master and slave
power units to energize said slave speed regula
and energize said motor for operation of said re
tor in a. direction to correct -for such difference
ceiving motors by said transmitter in a direction
to move said regulators to settings corresponding 35 and maintain ?said units svnchronized. and elec
tric switching means actuated automatically as
to said speeds, follow up means actuated by said
motor and actuating said switching means to
an incident to movement of said member to select
continue the operation thereof until the regula
a new speed setting to disable said mechanism
until such speed setting of said regulators is at
tor setting selected by said member has been
attained, mechanism automatically responsive to 410 tained and then. to render said mechanism ?again
operative.
a difference in the speeds of said master and slave
ii. A control for matching the speeds of slave
power units to energize said slave smed regulator
and master power units each having an adjusts
in a direction to correctior such difference, a
relay energized and deenergized under the con�
able speed regulator. said control comprising
trol of said switching means during operation 45 slave and master receiving electric actuators ar=
ranged to actuate the respective regulators, an
thereof by said member and said follow up means,
and means actuated by said relay to disable said
electrical transmitter operable to energize said
mechanism until a new speed setting of said reg
receiving actuators and cause rotation of the lat
ulators selected by said member has been at
ter to adjust said master and slave regulators in
tained and then to render said mechanism again 50 unison, means manually operable to cause actua
operative.
tion of said transmitter and said receiving mo
9. A control for matching the speeds of slave
tors in a direction to move said regulators to a
and master power units each having an adjust
selected speed setting, mechanism automatically
able speed regulator, said control comprising
responsive to a difference in the speeds of said
slave and master receiving electric actuators ar 55 master and slave power units to energize said
ranged to actuate the respective regulators, an
slave speed regulator in a direction to correct?ior
electrical transmitter operable to energize said
such di?erence and maintain said units synchro
receiving actuators and cause operation of the
nized, and means actuated automatically as an
latter to adjust said master and slave regulators
incident to actuation of said manually operable
in unison, electric motor driving means, means 60 means to select a new speed setting to disable
including a manually operable member shiitable
said mechanism until such speed setting oi? said
selectively to different positions corresponding to
regulators is attained and then to render said
speeds of said power units and operable, when
mechanism again operative.
_ moved to a new position, to energize said driving K
'
GEORGE FORREST DRAKE.
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