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Патент USA US2411247

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Nov. 19, 1946.
'r. A. COHEN. Y
2,411,247
ELECTRIC OSCILLATOR AND OSCILLATOR CONTROLLHD'RELAY- CIRCUIT
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‘Filed Jan. '7, 1942
4 Sheets-Sheet l
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776%‘01:
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(Bic/1 INVENTOR.
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N”. 19, 1946.
11cm,“
2,411,247
ELECTRIC OSCILLATOR‘ AND OSCILLATOR CONTROLLED RELAY CIRCUIT
Filed Jan. '7, 1942
‘
4 Sheets-Sheet 2
5%- 5 ‘
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7517416” I? [Me/1 mvmm
PM
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' A7702” Y
Nbv. 19, 1946.
T. A. COHEN
2,411,247
ELECTRIC OSCILLATOR AND OSCILLATOR CONTROLLED RELAY CIRCUIT
Filed Jan. 7, "1942
4 Sheets-Sheet 3
?j?zém i 616/? INVENTOR.
BYJ4Arne/var
4:,
NOV. 19, 1946.
T_ A_ COHEN
2,411,247
ELECTRIC OSCILLATOR AND OSCILLATOR CONTROLLED RELAY CIRCUIT
Filed Jan. '7, 1942
$1’6
4 Sheets-Sheet 4
6i!” INVENTOR.
TOR/V5)’
Patented Nov. 19, 1946 I
2,411,247 '
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UNITED STATES PATENTOFFICE
2,411,247
ELECTRIC CSCILLATOR AND OSCILLATOR
'
CONTROLLED RELAY CIRCUIT
Theodore A. Cohen, Chicago, Ill., assignor, by
memo as: ignments, to Wheelco Instruments
Company, Chicago, 111., a corporation of Illi
nois
Application January 7, 1942, Serial No. 425,906
1
26 Claims. , (Cl. 175-320)
This invention relates to'Electrical control‘ 9.9- '
paratus and its subject matter was originally in
cluded in but subsequently divided from the ap
plication which latter matured into United States
Letters Patent 2,228,163, issued January 7, 1941,
to Theodore A. Cohen, for improvements in Elec
trical control apparatus.
One of the objects of this invention is to pro
' vide a rugged apparatus in which the contacts of
2
ple form as at 5. This may be the pivot and Jewel
structure as commonly used. A pair of induct
ances 1—8 are mounted in spaced relationship to
allow passage of the ?ag 2, therebetween, as the
Pointer 4 moves around axis. The coils 1—8 form
a portion of the resonant circuit of an electronic
oscillator I, in whose output circuit is connected
a relay 3, having contacts ll, l2, l0_ With the
?ag 2 withdrawn from the coil system 7-—8 the
a rugged relay, may be controlled by the motion 10 oscillator is tuned to maintain the relay 3 in con
of the pointer, of a sensitive measuring instru
tact position as shown, with contacts Ill-ll
ment, for example a sensitive .millivoltmeter
closed and I ll—l2 open. Upon the ?ag 2 passing
without disturbing the measuring accuracy of the
within
the coil system ‘l---8 the oscillator is de
measuring instrument.
tuned due to the change in inductance of coils
A further object of this invention is to provide 15 'I--8, deresonating the oscillator I. This causes
an apparatus in which microscopic motion of the
the steady current through relay 3 to change to
pointer or moving part oi a measuring element
cause relay function and thus close relay contacts
may eii‘ect dependable relay action.
Ill-42 and open relay contacts ill-l l. The use
A further object of the invention is to provide
a split inductance such as 'l——8 is of especial
operation of such relay .apparatus without dis 20 of
advantage as will be pointed out more speci?cally
turbing the measuring accuracy of the instru
hereinafter.
ment.
vThe apparatus as shown is capable of operating
Other and further objects of this invention will
a rugged relay such as is adapted for use in fur
nace control and the like: with a motion of the
becomes better understood from an examination 25 ?ag 2 as small as .002".
‘become more apparent hereinafter as the same
of the speci?cation and claims, in conjunction
with the accompanying drawings, wherein:
Fig. 1 is simpli?ed schematic drawing of the
control apparatus.
‘
To prevent the possibility of charges collecting
upon the ?ag which might cause disturbance of
the accuracy of measurement of a sensitive in
strument of which the pointer 4 is a part (by at
Fig. 2 is a. modi?ed form oi.‘ the apparatus.
30 traction or repulsion thereof), a resistor 9 is in
Fig. 3 is a detailed view, of a. portion of the
corporated which permits grounding of the point
apparatus in Fig. 1.v
er 4 and at the same time, permits the placing
Fig. 4 is a modi?cation.
of the flag 2 and the coil system 1—-8 at the same
Fig. 5 is a modi?cation.
potential.
This eifectively prevents disturbance
Fig. 6 is a modification.
-35 of the measuring function. Another method of
Fig. 7 is a modi?cation.
preventing possible disturbing e?ects can be ac
Fig. 8 is a modi?cation.
complished by the inclusion of a resistor 9a. ,
I
Fig. 9 is a modi?ed circuit form.
Referring
to
Fig.
2
there
is
shown
another
form
Fig. 10 is a form of the apparatus assembled in
pictorial and schematic form to illustrate an 40 of the apparatus and circuit wherein the pointer
arm 4; ?ag 6, scale l3 and coils l-B are substan
actual industrial assembly.
_
tially as shown in‘ Fig. 1. 'In this apparatus the
Referring to the drawings more particularly, as
coils l-'-8 are part of a resonant circuit includ
shown in Figure 1, reference character 4 desig
nates the pointer of a measuring instrument, ' ing in addition the coil 14, condenser l5, and
e. g., a pyrometer, voltmeter, thermometen'or the 46 resistor l-Sa, which is used to control the damping
and therefore broadenthe tuning as desired of
_ like, actuated by the moving portion of the in
the circuit or which it is a part. This resonant
strument, not shown for simplicity, for indicat
circuit is coupled inductively to coil IS in the
ing upon a scale l3, the measured quantity.
Such sensitive measuring instruments, particu
control circuit of the oscillator I‘l. The resonant
larly of the millivoltmeter variety, have operat 50 circuit is adjustable to resonate with the oscilla
ing torques of not more than 1.0 millimeter gram
tor. The moving of the flag 6 within the coils
per 90 degrees of rotation and usually are about
'|-8 causes a change in tuning of the resonant
0.2 millimeter gram per 90 degrees of rotation.
circuit and a change in the absorption of the cir
The pointer 4 has attached thereto a light me
cult, of coil l6, with a consequent change in the
tallic ?ag 2, which may be of aluminum foil or 55 current passing through the relay 3 and a re
the like. The pointer 4 is shown pivoted in sim
sultant contact operation. A disturbance pre
-'
earner:
vention means is shown at lBb and functions sub
stantially as in Fig. 1.
-
Referring to Fig. 3 the apparatus and circuit
there shown comprises the vacuum “tube I8a
shown as a triode whose grid I9 is connected with
a grid condenser 20, and grid leak 2! the opposite
ends of which are connected to the upper end of
the coil 08, the other end of the coil being con
nected with the ?lament 22. In the plate circuit
a conductor 23 leads to a resonant circuit includ
ing the coil 24 and condenser 25 .and from this
resonant circuit a conductor 26 leads to the by
pass condenser 21 and'thence to the ?lament 22.
From the conductor 28 the circuit leads through
the choke coil 28 and relay 29 to the positive side
of the battery 30'. The negative side of the bat
tery leads to the ?lament 22. This type of os
cillator circuit is typical of the form known as
I tuned plate-tuned grid oscillator in which the
coupling means for the feed back of energy from _
' the plate circuit to the grid circuit takes the
form of a coupling condenser 21. A portion of
recti?ed manner as is disclosed in the aforemen
tioned parent Patent #2,228,163.
The inductance H3 (or 24) ‘is preferably of the
dual coil form such as described in Figures 1 and
4 to 10 hereinafter described because such split
coil form permits of a maximum change in in
ductance with a minimum linear movement of
the ?ag.
'
In an automatic control problem it is desirable
to sense an immediate departure from the preset
control level immediately so that compensation
for the departure may be provided as rapidly as
possible. Therefore relay action must be ob
tained with the smallest possible motion of the
flag upon the measuring instrument. At the
same time the relay in the oscillator apparatus
should be capable of operating its contacts with
the smallest possible current change. I there
fore provide a relay of small differential or high
throw out percentage. In this way with the
sensitivity of the oscillator to ?ag position change
together with the small differential relay micro
scopic motions of the ?ag are translated to imme
the coupling is also through the plate, grid, in
diate and dependable contact operations without
terelectrode capacity of the tube 98a. The choke
contact between the moving measur
coil prevents ?ow of oscillating energy through 25 mechanical
ing system such as ?ag 6 on pointer I! and the me
relay. For oscillation to take place it is necessary
chanical portion of the system of which coils
that the plate tank consisting of inductance 24
d'l-8 are a part.
and condenser 25 be resonated to the grid tank
In Fig. 4 is shown a form involving the use of
consisting of inductance l8 and the circuits’ own
an oscillating circuit commonly known. In this
capacity. Under the condition for maximum os
circuit, the coil 3| corresponds to the coil I8 of
cillation, a large bias is obtained across leak 2!
which makes grid is negative and thus a result
ant low plate current ?ows through relay 29.
Should either the plate tanker the grid tank be
detuned, oscillation decreases and plate current
Fig. 3. In this circuit the grid 32 of a vacuum
tube 33', shown as of the triode type, is connected
‘to the grid coil 3!, a circuit leading from this
coil 3i through the relay 34 and 'to the ?lament
rises through the relay 29. In this apparatus, one
form of detuning is shown, by means of the ?ag ’
H on pointer 66, which may be the pointer of a
measuring instrument as in Fig. 1. Upon the '
metal flag ll approaching or passing within the. 40
coil l8, detuning results due to the change in
inductance of i8 whereupon the plate current
sharply rises to close relay contacts 30. It is
obvious that the control inductance may be either
the grid coil or the plate coil 24 or thevflag ll
may control the amount of feed back between the
grid and plate circuit as will be explained herein
after in connection with Fig. 4. In the above de
cribed function the grid tank and plate tank have‘
been resonated to each other in order to produce a.
a low plate current to keep relay contacts 3!! open.
Upon either of the tanks being deresonated, the
plate current rises to close relay contacts. In
some forms of commercial apparatus, it is an "ad
vantage to have operation in the reverse manner, =
that is, it is desired to have the relay contacts
35. A circuit leads from the plate 36 through the
plate coil 31 to the condenser 38, the other side
of the condenser being connected with the con
ductor 40, this junction leading to the relay 34
and thence to the ?lament 35. This places the
relay in the grid circuit in position to be oper
ated by the: grid current. A circuit also leads
from the plate coil through the choke coil M to
the positive side of the plate supply battery 42.
Byplacing the relay in'the plate circuit as in Fig.
3 it may be operated by plate current change.
The negative side of the battery leads to the ?la
ment 35.
All the previous description of the oscillator.
circuit in Fig. 4 corresponds with the previously
described oscillator circuit with the exception ’
that the control ?ag 2 ?xed to indicating pointer
2! passes between the two inductances SLY-31
and thereby controls the feed back in the oscil
lator circuit. This type 'of oscillator circuit is
coupled to cause feed back by means of con
3‘ closed when ?ag is not at control point (plate
current high) and then to have said contacts
densor t8 and mutual inductance between coils
3i and 31. The feed back- between 3! and 31
'open when either tank is approached V-or a?ected ' is changed by'interposing control ?ag 20 to there-.
by the ?ag ll. .Such manner of operation is 60 by control the steady current ?ow through relay
easily obtained by deresonating plate tank ‘from
34. The coils 3ii—3'l are mounted so as to allow
grid tank some prechosen amount whereupon the'
'?ag 2a to pass between them such as ‘5-8 in Fig.
plate current remains at an original high value
l and may take the form of mutually facing coils
which maintains contact as closed. Upon the ap
such as in Fig. 8.
65
proach of ?ag ll within the inductance l8 (or
Referring to Fig. 5 there is shown diagram
24) the tank is retuned to resonance whereupon
matically a form oi apparatus for causing the
plate current drops to open relay contacts 3.
change in tuning of the oscillator circuit in which
' One advantage of such operation is in the case
the control ?ag H9 is mounted upon a secondary
where tube failure occurs relay contact 30 would
pointer 62!) attached to the coil v(not shown) or
70
open to deenergize the load circuit which maybe
movement system which operates the indicating
' a furnace or the like.
pointer s. Such an apparatus may be desirable
This oscillator, although shown energized from
where it is essential that the indicating system
batteries, obviously may be powered froma com
mercial alternating current source either-‘by
.not carry the control system. In this apparatus
the movement system i2! maybe’a D'Arsonval
means of the usual recti?er systemfor‘ in‘the self _ 75
_ 2,411,247
type meter, having the pointer 4 cooperating with
the scale I3 and having the other pointer I20
attached to the bottom of the coil, forming a part
of the movement system I 2I and carrying the
control ?ag II3.
Referring to Fig. 6, this ?gure shows still an
other form of pick-up construction in which a
small edgewise wound spiral I26 is placed in a
pick-up coil circuit such as shown in the pre
viously described oscillator circuits of Figures 1
to 4 inclusive and cooperates with the metal flag
I 21 on the pointer 4 which with its movement
will bring the metal ?ag I2'l close to and in a
coil 60 and condenser 6| is connected to the grid
leak ‘I0 and condenser ‘II and thence to grid 62
of the vacuum tube 63 which acts normally as a
detector, the lower side of the resonant circuit‘
being connected to the negative end of the battery
61, and the positive and of the battery being con
nected ‘to the plate of the tube 63 through a relay
66. The negative end of said battery is also con
nected to the ?lament of said tube.
10
The oscillator system including tube 43 func
tions as a tuned-plate-tuned grid oscillator as
already described above for Fig. 3. The link
circuit 66—6‘I-68-69—59a is adjusted to-reso
nate with tank II and 62 with the ?ag 6 with
plane substantially parallel to the plane of the
spiral coil I26.‘ The coil I26 may be the induct
drawn to a prechosen point from the cells 68
which correspond to the coils 1-8 in Fig. l or
Fig. 2. When the resonant circuit 6Il--6I is reso
ance I8 or 24 in Fig. 3 or the 'I—6 in Fig. 1.
Referring to Fig. 7 there is shown another form
of apparatus for controlling the tuning of the
oscillator circuit in which the ?ag is replaced by '
a coil I22 carried by the pointer and forming part, 20
of a resonant circuit including a condenser I23
nated with the link circuit 66-5'I—68—69——63a
such energy is detected by detector system 62
66—6‘I—‘I0—'II—6II—6I. Plate current through
relay 66 therefore drops to cause relay action.
When flag 6 is moved into coil system 63, link
circuit 66-69(1, inclusive, is deresonated where
also carried by the pointer. This coil I22 cooper
ates with pick-up coils I24 and I25 placed in the
oscillator circuit. The resonant circuit I22 and
upon energy to detector 62 ceases with consequent
I23 carried by the pointer 4 is normally resonant 25 change in plate current through relay 66 and
to the frequency of ‘the oscillator. Upon the
corresponding relay action results. Although a
, approachment of the coil system I22 to the pick
so-called grid bend detector is illustrated using
up coils I24 and I26, energy is absorbed from the
grid condenser 'II and grid leak ‘III a plate bend
oscillator circuit, causing a change in plate cur
detector may be used to give reverse operation
rent and a consequent operation of the relay con 30 or any variety of diode detector with appropriate
-.
a ‘
4
trolled thereby.
bias control. The contacts for the relay 66 are
Referring to Fig. 8 there is shown another form
not shown but may be as illustrated in previous
of pick-up coil construction involving the use of
?gures. With a resistor 59a withdrawn from the
2 spiral coils I28 and I29 lying in substantially
circuit sharpest tuning results (narrow resonance
parallel planes in which the flag I30 in its move 35 curve)
and relay 66 is operated with smallest
ment may pass between the spiral coils, the ?ag
motion of ?ag 1'6. As resistor 59a increases from
lying in a plane substantially parallel to the
zero resonant current reduces and tuning broad
planes of the spirals. These coils may replace
ens requiring a larger motion of the flag 6 to
1-8 in Fig. l or I3--24 in Fig. 3 or 3I-3‘I in
produce relay action. Thus the sensitivity of
Fig. 4.
40 control response may be adjusted. Such opera
As previously mentioned, an important func
tion is useful for throttling control wherein the
tion of an automatic control system is to produce
relay 66 may be, for instance, a variable reactor
dependable contacting with the smallest change
or a positioned fuel valve since the plate current
in measured quantity. It is desirable therefore
change can be. made proportional to the flag
to effect the greatest obtainable change in in 45 position 6 within the coils 68.
ductances with the smallest increment of ?ag
As shown in Fig. 10 one form of apparatus
travel since it is ?ag travel which eventually.
which may be used comprises a milli-voltmeter
results in operating the load contacts. By lump
having a movable coil 30 and a pointer 4 pivotally
ing the inductance so that all portions face the
mounted at 5 having an indicator ‘I5 cooperating
ilag surface the largest inductance change may 50 with an arcuate scale I3 and carrying the flag 6.
be obtained with minimum pointer travel. Such
The flag in its travel passes between the coils ‘I.
a coil structure is best exempli?ed by the spiral
and 8 to ail'ect the tuning of the oscillator circuit;
pancake coil in Figs. 6 and 8.
These coils 1 and 8 are mounted on a setting
Referring to Fig. 9 there is shown another form
lever ‘I6 which is pivotally mounted at 16c co
of apparatus and circuit including the oscillator 55 axially with the pointer 4. The setting lever may
tube 43, whose grid 44 is connected to the grid
also carry an index ?nger ‘I'I cooperating with
condenser-46 and grid leak 46, the circuit from
the arcuate scale I3. The setting lever ‘I6 may
the other side of the grid leak leading through
be set to any desired position by means of a suit
the coil 41 to the ?lament 48. From the plate
able adjusting mechanism 'I8. ' As indicated
43 a conductor- 56 leads to a resonant circuit, 60 above, when the ?ag 6 passes within the coils l
including the coil 5| and condenser 52, the other
side of the resonant circuit leading to the choke
- and 8., the oscillator apparatus ‘ID will be affected
causing the operation of relay ‘II. Such appa
ratus is essential in automatic control problems
and is shown in connection with furnace temper
to said ?lament 48. A by-pass condenser “is 65 ature, control in which case the energy for con
connected to the choke coil 53 and ?lament 48.
trolling the positlon of the milli-voltmeter pointer
This circuit functions as the oscillator described
4 is produced by thermo couple 5.
in Fig. 3. Coupled to‘ the plate coil 5| is a link
,The desired temperature is set upon scale I3
coil 63 and thence to the plate supply battery 54,
the other side of the plate supply battery leading
circuit including coils-66, 51' and 58, condenser
with pointer 11 and adjustment is. This posi
63, and resistor 53A whose function is similar to 70 tions the coils 1-8 at required point. When the
resistor lid of Fig. 2. Coupled to the coil 61 is
temperature is low in the furnace, insu?lcient
a resonant circuit comprising the coil 60 and con
energy is produced by the thermo couple 6 where
denser BI'. The controlling flag 6 on the pivoted '
arm 4 cooperates with the coils 68. The upper
upon the pointer 4 and indicator 16 are below the
control point 11. The ?ag 6 is not fully within
end of the resonant circuit, which-includes the 75 the coils 1-6 and relay 1| remains closed, con
/
' an 1,247
i
7
tacts ‘it closed, energizing furnace elements 13,
it electrically heated, or an electric valve if fuel
?red.
-
-
As the temperature rises in the furnace the
couple 5 is heated and .the pointer 5 moves up
scale. The flag 6 enters further between coils
'I-'8 changing the tuning ‘of the oscillator and
the tuning of said oscillator circuit, and means
for maintaining said part and said inductive por
tion at approximately the same potential to there
by prevent disturbing electrical effects upon the
measuring ability of said instrument, said oscil
lator controlling the position of said part."
3. The combination with an instrument having I
a variable position part, whose position is con
thereby opening contacts 12. The furnace now
trolled by variation in conditions to which the
cools until flag 6 is again withdrawn below con
trol point to cause a reenergization of the furnace. 10 instrument is subjected, of an oscillator circuit
having an inductive portion for cooperating with
This action continues giving so-called off-on or
said part, said part being movable to a position
two position control of the furnace. Because of
in which it affects said portion to thereby affect
the extreme sensitivity of the relay systemrvery
close temperature control is obtainable. The . the tuning of said oscillator circuit, and means '
for preventing accumulation of electrical charges
system is easily set up to produce contact opera
upon said movable part to thereby prevent dis
tion of 12 with a motion of the ?ag 6 within the
turbing electrical effects upon the measuring
cells 1-4! of less than .002".
'
'
ability of said instrument, said oscillator control
It is important in a control mechanism of this
ling the position of said part.
'
character that the control flag 6 be incapable of
4. The combination with an instrument having
' passing beyond the control coils ‘l and 8 because 20
a variable position part, whose position is con
if that should take place the relay contacts 12
trolled by variation in conditions to which the
would then be permanently closed and the fur
instrument is subjected, of an oscillator circuit
nace element 13 would be permanently energized.
having an inductive portion for cooperating with
The indicating pointer 15 would be de?ected to
said
part, said part being movable to a position
the top end of the scale and all control would be 25 in which it affects said portion to thereby ailect
I‘ lost, with resultant possible damage to furnace.
the tuning of said oscillator circuit, and means
A pointer stop 19 is therefore provided ?xed to
for maintaining said part and said inductive por
the lever 16 at 19A and insulated from any por
tion at a predetermined potential relationship to
tion of the circuit to arrest the pointer 15 before
thereby prevent disturbing electrical effects upon
the flag 6 can travel beyond the coil system '|—B. 30 the measuring ability of said instrument, said
To prevent electrostatic charges collecting upon
oscillator controlling the position of said part.
the flag 6 and causing erroneous indications upon
5. The combination with a contact controlling
the scale 13 of the pointer 15, the pointer and flag
relay, of means for controlling the operation of
6 are metallically connected at 6A. Such con
said relay comprising a detector circuit, an oscil
nection is usually made at a control spring mount 35 lator circuit, a link circuit between said oscillator
or leadv shown in-simpli?ed form at 6B. A leak
circuit and detector circuit, and means for chang
age resistor 60 places the ?ag and pointer at the ing the tuning of the link circuit to vary the
same potential as the coil system ‘|—-8 at 1A. The
energy transferred to the detector circuit to con
line supply for the system is conventionally shown
trol the operation of the relay.
at Ill. The oscillator 10 shown in simpli?ed block
6. The combination with an oscillator circuit
form may be any of the previous oscillator sys
and a variable position control element movable
tems described or one of the oscillator mecha
with respect to said circuit to change the tuning
nisms disclosed in the aforementioned parent
thereof, of a relay controlled by said change in
Patent #2,228,163.
45 tuning, said control element comprising a movable
It is obvious that the control apparatus may
metal plate, the circuit affected by said plate
be applied to any automatic control problem such
comprising a spiral coil with respect to which
as voltage frequency, etc., with an appropriate
said plate approaches and recedes in its move
measuring element and controlled compensator
ment, said plate and coil lying in substantially
for the departed quantity.
parallel planes when in proximity to each other.
I am aware that many changes may be made 50
7- The combination with a contact controlling
and details varied without departing from the
relay, of means for controlling the operation of
principles of my invention and I therefore do not
said relay comprising a detector circuit, an oscil
.wish to be limited to the details shown or de
lator circuit, a link circuit between said oscillator
scribed.
55 circuit and detector circuit, a portion of which
I claim:
_
consists of a pair of spaced inductances and means
1. The combination with an instrument having
for
controlling the link circuit to change its tun
a variable position part‘ carrying a control ele
ing to vary the energy transferred to the detector
ment and whose position is controlled by varia
circuit to control the operation of the relay, the
tions in conditions to which the instrument is
means for controlling the link circuit comprising
subjected, of a, resonant circuit, a vacuum tube 60 a control element carried by a measuring instru
oscillator for exciting said circuit, a second reso
_ ment and movable and in spaced relationship
nant circuit coupled to said ?rst resonant circuit,
'7 the control elementwhose position isrcontrolled
by said ‘variable position part, being movable to
with said inductances.
,
8. The combination with an oscillator circuit
a variable position control~ element movable
a position in which it a?ects the tuning of said. 65 and
with respect to said circuit to‘ change the tuning
second resonant circuit, and a relay controlled
thereof, of a relay controlled by said change in
by said oscillator, to in turn control said position
tuning, ‘said control element comprising a mov
of said variable position part.
able metal plate, the circuit affected by said plate
2. The combination with an instrument having
a variable position part, whose position is con. 70 comprising a pair of spaced spiral coil-s between
which said plate approaches and recedes in its
trolled by variation in conditions to which the,
movement, said plate and coils lying in substan
instrument is, subjected, of an oscillator circuit
tially spaced parallel planes when in proximity
having an inductive portion for cooperating with '
to each other. i
'
said part, said part being movable to a position
in which it a?ects said portion to thereby affect 75 9. The combination with an instrument having
9,411,947
a variable position part, whoseposition is con
trolled by variation in conditions to which the
instrument is subjected, or a resonant circuit
having an inductive portion for cooperating with
said part, said part being movable to a position
in which it affects said portion to thereby affect
the tuning of said resonant circuit and an oscil
lator circuit controlled in turn by changes in tun
ing of said resonant circuit, said resonant circuit
being provided with adjustable means for setting
a predesired damping to thereby control the sensi
tivity of response for a given motion of said mov
able part.
"
10. In an automatic control mechanism includ
ing an instrument responsive to changes in a
measured quantity, said instrument motivating
a movable part, a control circuit provided with
inductance for cooperating with said part in
10
rated a relay, adapted to iunction in one manner
at one energy level from said oscillator in accord
ance with one movable part position, and in an
other manner when said energy level is varied in
accordance with movement of said part a prede
termined distance, said resonant circuit being
provided with adjustable means for setting a pre
desired damping to thereby control the sensitivity
of response for a given motion of said movable
part.
14. In an automatic control system, a sensitive
measuring instrument having a variable position
part the position of which is controlled by varia
tions in conditions to which the instrument is
subjected, such variable position part cooperating
with an inductive portion of an oscillating circuit,
said inductive portion being adjustably movable
over a total range of the indicating portion of the
spaced relationship therewith, said inductance
variable position part, said oscillator in turn con
forming a portion of the grid tank of a vacuum
tube oscillator, in the plate circuit of which is
contained a tuned circuit adapted to be resonated 4
with said grid tank, ,in desired degree the plate
trolling a relay which is in one position when said
variable position part is below said inductive por
tion to control the control system in one manner
and in another position when said variable posi
tion part is in prechosen relationship with said
circuit also containing a relay adapted to be ener
gized by the non-pulsating component in said
plate circuit and thereby cause contact operation 25 inductive portion to control the controlled system
in a second manner, said inductive portion having
in another manner when said part is ‘actuated
mounted in mechanically spaced relation there
a predetermined distance to change the tuning
with a stop element to prevent the variable posi
of said grid tank.
'
tion part from assuming a position with respect
11. The combination with an oscillator circuit
30
to
said inductive portion whereby the controlled
and a variable position control element motivated
system would become non-‘operative.
by a measuring instrument and movable with
15. A claim such as claim 6 with the spiral coil
respect to said circuit to change the tuning there
?at.
of, of a relay controlled by said change in tuning,
16. A claim such as claim 8-with the spiral coils
said control element comprising a resonant cir
'
35 ?at.
cuit including a condenser and coil, the circuit
1'7. The combination with an instrument hav
controlled by said control element including a
ing a variable position part whose position is con
coil with respect to which said resonant circuit
trolled by variation in conditions to which the
approaches and recedes in its movement to in
‘instrument is subjected, 01' an oscillator circuit
turn control the position of said variable position
40 having spaced inductances cooperating with said
control element.
part, said part in its motion a?ecting the induc
12’. In an automatic control apparatus, the
tive relationship of said inductances whereby said
. combination of a measuring instrument, having
oscillator in turn controls the position of said part
means for indicating or sensing departure from
a prechosen level, such means including a mov
able position part, cooperating in spaced relation
45
ship with an inductance forming a portion of a
resonant circuit, whereby motion of said part
affects the tuning of said circuit, said circuitact
ing as a transmission channel for energy pro
duced by a vacuum tube oscillator coupled there
with, such energy being transferred in greater or
less degree with motional effect or said first part
on said inductance, to a coupled circuit forming
a portion of a detector, in whose plate circuit is
incorporated a relay, adapted to function in one
and means for maintaining said part and said
inductances at a’ predetermined potential rela
tionship to thereby prevent disturbing electrical
eil'ects upon the measuring ability of said instru
ment.
.
'
18. A claim such as claim 1 with the instru
ment of the millivoltmeter variety with an oper
ating torque of not more than 1.0 millimeter
grams per 90 degrees of rotation.
19. A claim such' as claim 2 with the instru
ment of the millivoltmeter variety with an oper
ating torque » of not more than 1.0 millimeter
grams per 90 degrees of rotation.
v
20. A claim such as claim 3 with the instru
ment of the millivoltmeter variety with an oper
manner at one energy level from said oscillator
in accordance with one movable part position,
and in another manner when said energy level is
varied in accordance with movement of said part 00 ating torque of not more than 1.0 millimeter
grams per 90 degrees of rotation.
a predetermined distance.
21. A claim such as claim 4 with the instru
13. In an automatic /control apparatus, the
ment of the millivoltmeter variety with an oper
mbination of a measuring instrument, having
ating torque of not more than 1.0 millimeter
means for indicating or sensing departure from
grams per 90 degrees of rotation.
a prechosen level, such means including a movable
22. A claim such as claim 9 with the instru
position part, cooperating in spaced relationship
with an inductance forming a portion of a reso
ment of the millivoltmeter variety.
nant circuit, whereby motion 01' said part affects
the tuning of said circuit, said circuit acting as
ment of the millivoltmeter variety.
23. A claim such as claim 10 withv the instru
a transmission channel for energy produced by 70 24. A claim such as claim 12 with the instru
ment oi’ the millivoltmeter variety.
a vacuum tube oscillator coupled therewith, such
25. A claim such as claim 13 with the instru
energy being transferred in greater or less degree
ment of the millivoltmeter variety.
with motional eii‘ect or said ?rst part on said in
26. A claim such as claim 14 with the instru
ductance, to a coupled circuit forming a portion
ment of the millivoltmeter variety.
or a detector, in whose plate circuit is incorpo
76
'
THEODORE A. COHEN.
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