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Патент USA US2403744

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July 9, 1946-
vF.
NICHOLSON
2,403,744
CODE DETECTING MEANS
'
Filed March 16, 1945
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ATTORNEY
1
Patented July 9, 1946
2,403,744
UNITED STATES PATENT OFFICE
2,403,744
4
CODE DETECTING MEANS
Frank H. Nicholson, Penn Township, Allegheny
County, Pa., assignor to The Union Switch &
Signal Company, _Swissvale, Pa., a corporation
of Pennsylvania
Application March 16, 1945, Serial No. 583,058
6 Claims.
(Cl. 246-34)
2
My invention relates to coded signaling appa
ratus and particularly to improved means for
detecting coding operation of a code following
relay.
An object of my invention is to provide code
detecting means which is immune to false re
sponse in the event the contacts of the code fol
lowing relay are defective or out of adjustment.
A further object of this invention is to provide
ation of one or the other of two code following
track relays is to be detected.
_
Similar reference'characters refer to similar
parts in each of the two views.
I
_
_ .
_
'
In most instances in the drawing relay con.
tacts are shown directly under the relay wind
ing, but in some cases in order to simplify the
drawing relay contacts are separated from the
all-relay code detecting means which is arranged 10 relay winding and where this is done the relay
with which the contact is associated is designat
so that fused or overlapping contacts on the code
ed by an appropriate reference character placed
following relay cannot result in improper ener
directly over the contact.
'
‘
gization of the associated code detecting relays.
Referring
to
Fig.
l
of
the
accompanying
draw
Other objects of the invention and features of
novelty will ‘be apparent from the following de— 15 ing, there is shown therein a section of railway
track having track rails I and 2 which are sepa
scription taken in connection with the accom
rated from the rails of adjacent sections by‘ in
panying drawing.
sulated
joints 3. Tra?ic in this section normally
I shall describe two forms of code detecting
moves in the direction indicated by the arrow,
means embodying my invention and shall then
that is, from left to right, and a wayside signal
point out the novel features thereof in claims.
20 S is located at the entrance end of the section
In practicing my invention, I provide the code
and governs traffic in the section. As shown, the
following relay with two movable contacts which
are operated between a ?rst and a second posi
tion substantially in synchronism. These mov
able contacts are connected by a supply conduc
tor and one contact connects the supply conduc
signal S is of the color light type and has a red
or stop lamp R and a green or clear lamp G.
,
A code following track relay TR is connected
25 across the section rails at the entrance endof
the section and is operated by master code en
tor to one or the other terminal of a source ac
ergy supplied over the section rails from the
cording as the contact is in its ?rst or its second
track battery TB at the exit end of the section.
position. The other movable contact when in
one position establishes connection from the sup 30 The supply of energy from the tracksbattery to
the section rails is controlled by a coding device
ply conductor through the winding of a ?rst aux
CT
which has a contact In which is operated be
iliary or code detecting relay to a terminal of
tween an open and a closed position at a selected
the source, and in its other position establishes
rate, such as 75 to 180 times a minute. ,
connection from said supply conductor through
The ‘track relay‘ TR governs the supply of en
the winding of a second auxiliary or code detect 85
ergy
to slow release auxiliary relays FSA and
ing' relay to a terminal of the source providing
BSA from a battery [2, while the relay BSA gov
the contacts of the ?rst auxiliary relay are
erns the supply of energy to the lamps of the sig
picked up. The circuits are arranged so that
overlapping of the contacts of one of the mov
able contacts on the code following relay results
in short-circuiting of the battery with resultant
deenergization of both auxiliary relays, while
overlapping of the contacts of the other movable
contact on the code following relay results in
short circuiting of one or the other of the auxil
iary relays.
In the drawing:
'
nal S.
.
When the track section is vacant, energy sup
40 plied from the battery TB during the closed
periods of contact ID of coding device CT feeds
over the section rails to the Winding of the track
relay TR and picks up the contacts of this re
lay, while during' the open periods of contact I!)
45 of the coding device CT the supply of energy
from battery TB to relay TR is interrupted and
the contacts of the relay TR release.
The track relay TR is equipped with a ?rst
Fig. 1 is a diagramof a section of railway track
movable contact l4 and a second movable con
equipped with coded track circuit apparatus and
provided with means embodying my invention for 50 tact I6 which are connected by a‘supply conductor
IS. The track relay contacts are biased to a re
‘detecting code following operation of the track
leased or ?rst position and are movable there
relay, and
from to a picked-up or second position.
Fig. 2is a diagram showing a, modi?ed arrange
ment adapted for use where code following oper 55 When the track relay contacts are in their
picked-up or second position, energy is supplied
2,403,744.
3
4
Similarly, if the movable contact I6 of relay
from the second or positive terminal of the bat
TR simultaneously engages its front and back
tery I! over front contact I4 of relay TR, supply
points of contact and contact l4 engages its back
conductor l5, front contact l6 of relay TR and
contact, the relay FSA will be shunted over the
winding of relay FSA to the first or negative ter
circuit which is traced from the left-hand termi
Ca
minal of the battery l2. The energy supplied to
nal of the relay winding over front contact l6
relay FSA picks up the relay contact with the
of relay TR, wire l5, and back contact IA of
result, that during the released periods of the
relay TR to the right-hand terminal of the wind
track relay TR energy is supplied from, the second
ing of relay FSA. As the winding of relay FSA
or positive terminal of the battery through the
is short circuited, the relay contact I‘! will be
winding of relay BSA, front contact ll’ of relay 10 released and will interrupt the circuit of relay
FSA, back contact "5 of relay TR, wire l5, and
BSA and thus insure that contact l8 of relay
back contact H of relay TR to the negative or
BSA is released and causes signal S to display
?rst terminal of the battery l2. Accordingly,
its stop indication.
contact l8 of relay BSA is picked up and estab—
‘In addition, under these conditions, a circuit
lishes the circuit of the green lamp G of the sig
is not established for supplying energy from the
nal S. The relays FSA and BSA are of a type
battery l2 to the relay FSA and its contact I1
the contacts of which are slow to release and the
is certain to remain released.
contacts of these relays remain picked up during
front contact 16 of relay TR fuses and re
the intervals in which the supply of energy to
mains closed, and if at the same time back con
20
the relay winding is interrupted.
tact I4 of relay TR fuses, the relay FSA will be
When a train enters the section, the contacts
short circuited over an obvious circuit and will
of relay TR remain released and do not estab
remain released.
lish the circuit of relay FSA and, after a short
Likewise, if back contact is and front contact
time interval, contact 11 of relay FSA releases
ll of relay TR fuse and remain closed, the relay
and interrupts the circuit of relay BSA and its
BSA will be short circuited over the circuit con
contact l8 releases to interrupt the circuit of the
trolled by front contact ll of relay F‘SA if relay
green lamp G and establish the circuit of the
FSA is picked up, but under these circumstances
red lamp R. When the section is vacated, the
relay FSA will ordinarily be released because of
track relay again responds to coded energy and
the open front contact I6 of track relay TR. In
energy is supplied to relay FSA during the picked
any case relay BSA will be released and main
up periods of the track relay contacts and is sup
tain the display of the stop indication by signal S.
plied to the relay BSA during the released periods
Since bridging or overlapping contacts on the
of the track relay contacts so that the circuit of
‘track relay TR cannot result in improper ener
the green lamp of signal S is established.
gization of the relay BSA, there is no possibility
The circuits of the relays FSA and BSA are
that the relay BSA will be picked up unless the
arranged so that fusing or overlapping of the
relay TR is responding to coded energy. Accord
front and back points of contacts l4 and it of
ingly, at times when the relay TR is not respond
the track relay TR cannot result in improper
ing to coded energy, as for example, when the
energization of relay BSA with consequent dis
section is occupied or the supply of coded energy
play by the signal S of a green instead of a red 40 over the section rails is cut off for any other
indication.
reason, or if steady energy is supplied to the track
As explained above, when the section is occu
relay, the relay BSA is. certain to remain released
pied, the contacts of relay TR are released and
and maintain the display of the stop indication
should interrupt the circuit of relay FSA so that
by signal S, and there is no possibility that the
its contact ll interrupts the circuit of relay BSA
relay BSA will be improperly picked up to cause
and thus causes contact l3 of relay BSA to be
signal S to display its green indication.
released and maintain the circuit of the red lamp
The principle embodied in the equipment shown
of the signal S.
in Fig. 1 is also applicable to situations where
If, for any reason, the movable contact It of
two track relays are employed and there is decod
the 'track relay TR simultaneously engages its
ing means governed jointly by these relays. One
front and back points of contact, a connection
example of such a situation is at an intermediate
will be established between the two terminals of
signal location in single track stretches where
the battery l2 and the battery will be short cir
traffic is operated in one direction at times and
cuited but energy will not be improperly supplied
in the other direction at other times.
to relays FSA and BSA and they will remain re
In Fig. 2 of the drawing there is shown a por
leased and maintain the circuit of the red lamp
tion of the equipment at an intermediate signal
R of signal S.
location. In order to simplify the disclosure,
If the movable contact it of relay TR simul
only the equipment essential to the understand
taneously engages its front and back points of
ing of this invention has been illustrated and the
contact, and the contact M of relay TR engages
remainder of the equipment may be arranged in
its front contact, the relay FSA will be energized,
any appropriate manner, as, for example, as
but the relay BSA will be shunted over the cir
shown
in’ Fig. 10 or 1d of Letters Patent of
cuit which is traced from the left-hand terminal
the United States No. 2,344,573 issued March 21,
of the relay winding over front contact ll of
1944, to J. J. Van Horn, or in Fig. 1c of Letters
relay FSA, back contact l6 of relay TR, wire l5,
Patent of the United States No. 2,344,333 issued
and front contact l4 of relay TR to the right
March 14, 1944, to J. J. Van Horn.
hand terminal of the winding of relay BSA. As
As explained in the above-identi?ed Van Horn
the winding of relay BSA is shunted the relay
patents, the equipment for the track stretch is
contact I8 is released and maintains the circuit
controlled so that when. the stretch is prepared
of the red lamp of the signal S.
for westbound trailic, that is, from right to left,
‘Furthermore, under the conditions stated
coded energy is supplied to the left-hand end of
above, the relay BSA not only is shunted, but no
section 5T, and when the stretch is prepared for
circuit is established to supply energy to the relay
eastbound traffic, that is, from left to right, coded
winding and the relay contact is certain to re
energy is supplied to the right-hand end of sec
main released.
2,403,744
5
.
tion '6T.'- The coded energy supplied to'the rails
of sections 5T~and15T is of 75, or 180 code fre
quency. according as the section in advance. is
occupied. or unoccupied.
The equipment, at the '
.signal location includes means, not shown,. effec
tive when tra?ic is established in one direction
»or>the other to supply energy of 75 or 180 code
‘frequency toone orthe other of the coding relays
SECTM or. GWCTM and thus cause coded energy
to besupplied to ‘the rails of one or the other of
the sections 5T ‘or 6T.
-
.Theequipment is shown in thecondition which
:it assumes when tra?ic-is notestab-lished in either
were supplied to relay TM, it would hasten re
lease .of the relay. contact and might objection
ably reduce the length of the picked-up periods
of this contact.
v
.
When relay BSA picks up, its contact 3! estab
lishes the circuit governed by the contact of
relay TM for supplying energy from a source of
direct current, not shown, the terminals of which
are designated B and C in the drawing, to the
primary winding of the decoding transformer
DT, from the secondary winding of which en
ergy is supplied through a resonant recti?er unit
it’ODU to relay D to pick up the contacts of relay
D when and only when the relay TM is operated
by energy of 180 code frequency.
and BES arelighted.
.
. .
When relays BSA and GEFSA pick up‘, energy
The ?rst track relay GETR has a ?rst movable
is supplied to the yellow lamp Y or to the green
contact 2 I‘ and a second movable contact 22 which
lamp G of signal 'BES according as contact 32 of
‘are connected by, a ?rst supply conductor- I9.
relay
D is released or picked up. In addition,
The second track relay 5WTR has a ?rst movable v20
when relay BSA picks up, energy is supplied over
contact 25 and a second movable contact 24 which
its contact 34 and. back contact 35' of relay
;are connected by a second supply conductor 25.
'EVVF‘SA to the red lamp R of Signal 5WS.
'
The contacts of the track relays BETR and SWTR.
‘
During
occupancy
of
section
ET
the
relay
SETI‘R.
,are biased to a ?rst or released position and are
remains released and does not establish the cir
movable therefrom to a second or picked-up posi
cuit of relay SEFSA so that it remains released
...tion.
and does not establish the circuit of relay BSA.
_-When the stretch is prepared for eastbound
‘direction. . At such times the relaysare all re
leased and red lamps of the ‘wayside signals 5WS
Accordingly, relay BSA is released and interrupts
the supply of energy to the decoding transformer
coded energy sup-plied over the rails of section
GT, and the second relay 5WTR is deerengized so 30 DI‘ and to the lamps Y and G of the signal BES,
and establishes circuits to maintain the supply of
that its contacts remain released. When ,the
energy to the red lamps R of signals SES- and
contacts of relay EETR, pick up, energy is sup
5WS.
.
plied to the ?rst auxiliary relay BEF‘SA over the
When
section
ST
is
vacated,
the
relay?ETR is
circuit vwhich is traced from the second or posi
operated by coded energy and relays GEFSA and
_.tive.terminal of the battery 20 over front con~ 35 BSA
are again picked up.
,tact2l of relay GETR, the ?rst supply conductor
When
the stretch is prepared for westbound
l9, front contact 22 of relay BETR, Winding of
traffic, the relay SWTR is operated by coded en
‘relay GEFSA, back contact 23 of relay BWFSA,
ergy supplied over the rails of section 5T so that
.back contact 24 of relay SWTR, the second sup
during picked-up periods of the relay energy is
ply conductor 26, and back contact 25 of relay
supplied to relay 5WFSA over the circuit which
5WTR to the negative or second terminal of the
is traced from the positive terminal of battery
battery 20. The energy supplied to the winding
20 over front contact 25 of relay EWTR, wire 26,
of relay GE'FSA picks up the relay contacts with
front contact '24 of relay SWFSA, back contact
the result that during the released periods of the
27 of relay GEFSA, and back contacts 22 and 2!
contacts of relay?ETR energy is supplied to relay
of relay BETR to the negative terminal of bat
BSA over-the circuitwhich is traced from the
tery 2@. During the released periods of the relay
ypositive'terrninal of the vbattery 20 through the
SWTR energy is supplied to relay BSA over the
windingof relay BSA, front contact 21 of relay
circuit which is traced from the positive terminal
I BEFSA, back contact 22 of relay GETR, wire I9,
of battery 20- through the winding of relay BSA,
and back contact 2| of relay GETR to the nega
front contact 23 of relay 5WSA, and back con
tive terminal of the battery 20,. Accordingly, the
tacts 24 and 25 of relay SWTR. to- the negative
contacts of relay BSA pick up and its contact 30
terminal of the battery, Accordingly, contact 3B
connects the Winding of code following relay TM
of relay BSA is picked up to connect relay TM in
, in multiple with the winding of relay BSA so that,
multiple with relay BSA While other contacts of
J during the release periods of relay GETR, relay
relay BSA estabilsh the circuits of the decoding
TM is energized from battery 20 over the circuit
transformer and of the lamps Y and G of the
, lust traced for relay BSA and the contact of relay
signal 5WS, and signal 5WS displays a yellow
, TM picks up.
or a green indication depending on whether re
, During‘ subsequent picked-up periods‘ of the
lay D is released or picked up, while signal GE'S
vrelayl?ETR, energy is supplied to» relay BEFSA.
displays its red indication.
_ over the circuit traced above, and the supply
When section 5T is occupied, the relay SWTR'
, of energy to relays BSAand TM is interrupted
remains released so that relays 5WFSA and BSA
and relay TM releases. The relays GEFSA and
are released, and energy is supplied to the red
BSA areof a type the contacts of which are slow
‘ to release so that they remain picked up during ._ ' lamps of the signals GES and 5WS.
The equipment shown in Fig. 2 is arranged so
_ code following operation of the relays BETRYand
that overlapping of the contacts on either of the
TM and contact 30 of relay BSA maintains the
track relays BETH and 5W'I'R. will not result in
. circuit of relay TM.
'
improper display-of a permissive indication by
, l,An asymmetric unit or recti?er is connected
either of the signals.
in series with the winding of relay TM and is
If movable contact 2| of relay 6ETR simultane
‘ poled. to permit energy from the battery 20 to
ously engages its front and back points of con
energize the relay TM but to prevent the supply
tact, the battery 29 will be short circuited and
"to relay TM of the energy induced in the wind
energy will not be supplied therefrom to relay
ning of‘ relay BSA on interruption of the supply
GEFSA or to relay BSA and relay BSA is certain
traiiic, the ?rst track relay EETR is operated by
:cfenergy to the relay winding. If this energy. .75
to remain released. Similarly, if movable contact
2,403,744
‘7
25 of relay 5WTR simultaneously engages its
front and back points of contact, the battery 20
will be short circuits and relays 5WFSA, TM and
BSA will remain released and signals BES and
5W8 will both display their stop indications.
If movable contact 22 of relay GETR simul—
taneously engages its front and back points of
8
terminal of said source, circuit means including in
series a front contact of said first auxiliary relay
and said code following relay contacts for con
necting the other terminal of the winding of said
second auxiliary relay to the ?rst terminal of said
source when said code following relay contacts
are both in their ?rst position, and a control cir
cuit governed by a contact of said second auxiliary
contact, and if at the same time contact 2| en
relay.
gages its front point of contact, energy will be
2. In combination, a code following relay hav
supplied to relay SEFSA over the circuit which 10
ing a ?rst and a second movable contact which
is traced from the positive terminal of the battery
arelactuated between a ?rst and a second position
20 over contacts 2| and 22 of relay BETH, wind
substantially in synchronism, a source of current
ing of relay ‘SEFSA, back contact 23 of relay
having a ?rst and a second terminal, the ?rst
5WFSA, and back contacts 24 and 25 of relay
5WTR to the negative terminal of the battery. 15 contact of said code following relay being effec
tive according as it is in its ?rst or its second posi
The energy supplied to relay GEFSA picks up its
tion to connect a supply conductor to the ?rst
contacts so that its contact 21 interrupts the
or the second terminal of said source,'the second
circuit of relay SWFSA and insures that it re
contact of said code following relay being effec
mains released, while, when contact 21 of relay
tive when in its ?rst position provided the ?rst
GEFSA is picked up, the relay BSA is short cir
contact of said code following relay is also in its
cuited over the circuit which is traced from the
?rst position to establish a circuit including said
right-hand terminal of the relay winding over
supply conductor for supplying energy from said
front contact 2| of relay BETR, wire 19, back
source to a ?rst slow releasing auxiliary relay,
contact 22 of relay GETR, and front contact 21
of relay SEFSA to the left~hand terminal of the 25 said second contact of said code following relay
being effective when in its second position pro
winding of relay BSA. Accordingly, relay BSA
vided the ?rst contact of said code following
remains released to cause signals GES and 5W8
relay is also in its second position to establish a
to both display stop indications and does not
circuit including said supply conductor and a
establish circuits to permit signal BES or 5WS
30 front contact of said ?rst auxiliary relay for
to display a permissive indication.
supplying energy from said source to a second
If contact 22 of relay BETR simultaneously
auxiliary relay, and a control circuit governed by
engages its front and its back points of contact,
and if at the same time contact 2| engages its
back point of contact, the relay GEFSA will be
shunted over the circuit which is traced from the
left-hand terminal of the relay winding over back
contact 23 of relay 5WFSA, back contacts 24 and
25 of relay 5WTR, back contact 2| of relay SETH,
wire l9, and front contact 22 of relay GE'TR to
the right-hand terminal of the winding of relay 40
said second auxiliary relay.
3. In combination, a code following relay hav
ing a ?rst and a second movable contact which
are actuated between a ?rst and a second position
substantially in synchronism, a source of current
having a ?rst and a second terminal, the ?rst
contact of said code following relay being effec
tive according as it is in its ?rst or its second
position to connect a supply conductor to the ?rst
or the second terminal of said source, a ?rst slow
BEFSA. As the relay BEFSA is shunted, its con
tacts remain released and do not establish the
releasing auxiliary relay having one terminal of
circuit of relay BSA so that it remains released.
its Winding connected to the ?rst terminal of
Similarly, if movable contact 24 of relay BW'I‘R
said source, the second contact of said code fol
simultaneously engages its front and back points
lowing relay being effective when in its second
of contact, the relay BSA will be short circuited
position to connect said supply conductor to the
if contacts 25 engages its front point of contact,
other terminal of the winding of said ?rst
and relay SWFSA will be short circuited if con
auxiliary relar, said second contact of said code
tact 25 engages its back .point of contact. In
either case relay BSA remains released and main 50 following relay being effective when in its ?rst
position provided the contacts of said ?rst
tains the circuits for the red lamps of signals 5W8
auxiliary relay are picked up to connect said sup
and BES.
ply conductor to the second terminal of said
Although I have herein illustrated and de
source in series with the winding of a second
scribed only two forms of code detecting means
auxiliary relay, and a control circuit governed
embodying my invention, it is understood that
by a contact of said second auxiliary relay.
various changes and modifications may be made
4. In combination, a code following relay hav
therein within the scope of the appended claims
ing a ?rst and a second movable contact which
without departing from the spirit and scope of
are actuated between a ?rst and a second posi
my invention.
tion
substantially in synchronism, a source of cur
60
Having thus described my invention, what I
rent having a ?rst and a second terminal, the
claim is:
?rst contact of said code following relay being
1. In combination, a code following relay hav
eifective according as it is in its ?rst or its second
ing two movable contacts actuated between a
position to connect a supply conductor to the
first and a second position substantially in syn
chronism, a source of current having a ?rst and 65 ?rst or the second terminal of said source, the
second contact of said code following relay being
a second terminal, a ?rst slow releasing auxiliary
effective when in its second position to connect
relay having one terminal of its winding con
said supply conductor to the ?rst terminal of
nected to the first terminal of said source, a cir
said source in series with the winding of a ?rst
cuit including said code following relay contacts
slow releasing auxiliary relay, said second con
in series for connecting the other terminal of the
tact of said code following relay being effective
winding of said ?rst auxiliary relay to the second
when in its ?rst position provided the contacts
terminal of said source of current when said code
of said ?rst auxiliary relay are picked up to con
following relay contacts are both in their second
nect‘ said supply conductor to the second ter
position, a second auxiliary relay having one
minal of said source in series ‘with the winding
terminal of its winding connected to the second
2,403,744
10
of a second auxiliary relay, and a control circuit
governed by a contact of said second auxiliary
relays, and a circuit governed by said second and
third auxiliary relays.
relay.
6. In a coded signaling system, in combination,
5. In a coded signaling system, in combination,
a ?rst and a second code following relay each of
which is provided with a ?rst and a second mov
a first and a second code following relay each
of which is provided with a ?rst and a second
movable contact which are biased to a ?rst po
sition, means for at times actuating the contacts
of said ?rst code following relay between their
?rst and a second position and for at other times
actuating the contacts of said second code fol
lowing relay between their ?rst and a second
position, the ?rst contact of the ?rst code follow
ing relay being effective according as it is in its
?rst or its second position to connect a ?rst
supply conductor to the ?rst or the second termi
nal of a source of current, the ?rst contact of
able contact, which are biased to a ?rst position,
means for at times actuating the contacts of said
?rst code following relay between their ?rst and
a second position and for at other times actuat
10 ing the contacts of said second code following
relay between their ?rst and a second position,
the ?rst contact of the ?rst code following relay
being effective according as it is in its ?rst or its
second position to connect a ?rst supply con
15 ductor to the ?rst or the second terminal of a
the second code followingr relay being eifective
source of current, the ?rst contact of the second
code following relay being effective according as
it is
its ?rst or its second position to connect
according as it is in its ?rst or its second position
a second supply conductor to the ?rst or the sec
to connect a second supply conductor to the ?rst
or the second terminal of said source of current, 20 ond terminal of said source of current, the second
contact of said ?rst code following relay being
the second contact of said ?rst code following
effective
when in its second position to connect
relay being effective when in its second position
said ?rst supply conductor to the ?rst terminal
to connect said ?rst supply conductor to the ?rst
of said source in series with the winding of a ?rst
terminal of said source in series with the winding
of a ?rst slow releasing auxiliary relay provided 25 slow releasing auxiliary relay provided the con
tacts of a second slow releasing auxiliary relay
the contacts of a second slow releasing auxiliary
are released, the second contact of said ?rst code
relay are released and the contacts of said sec
following relay being effective when in its ?rst
ond code following relay are in their ?rst posi
position to connect said ?rst supply conductor
tion, the second contact of said ?rst code follow
ing relay being effective when in its ?rst position 30 to the second terminal of said source in series
with the winding of a third auxiliary relay pro
to connect said ?rst supply conductor to the
vided
the contacts of said ?rst auxiliary relay
second terminal of said source in series with the
are picked up, the second contact of said second
winding of a third auxiliary relay provided the
code following relay being effective when in its
contacts of said ?rst auxiliary relay are picked
second
position to connect said second supply
35
up, the second contact of said second code fol
conductor to the ?rst terminal of said source in
lowing relay being effective when in its second
series with the winding of said second auxiliary
position to connect said second supply conductor
relay
provided the contacts of said ?rst auxiliary
to the ?rst terminal of said source in series with
relay are released, the second contact of said
the winding of said second auxiliary relay pro
vided the contacts of said ?rst auxiliary relay are 40 second code following relay being effective when
in its ?rst position to connect said second supply
released and contacts of said ?rst code following
conductor to the second terminal of said source
relay are in their ?rst position, the second con
tact of said second code following relay being
effective when in its ?rst position to connect said
second supply conductor to the second terminal
of said source in series with the winding of said
third auxiliary relay provided the contacts of
said second auxiliary relay are picked up, a cir
cuit governed by said ?rst and third auxiliary 50
in series with the winding of said third auxiliary
relay provided the contacts of said second aux
iliary relay are picked up, a circuit governed by
said ?rst and third auxiliary relays, and a cir
cuit governed by said second and third auxiliary
relays.
FRANK H. NICHOLSON.
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