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Патент USA US2130449

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Sept 29, 1938»
H. A. THOMPSON
2,130,449
RAILWAY TRAFFIC CONTROLLING APPARATUS
Filed June 18, 1937
5 Sheets-Sheet 1
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HowardA
BY
INVENTOR
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HIS "'A' ORNEY
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Sept. 20, 1938, .
H. A. THOMPSON
2,130,449
RAILWAY TRAFFIC CONTROLLING APPARATUS
Filed June 18, 1937
5 Sheets-Sheet 2
HowapdA
INVENTOR
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BY ' »l
ATTORNEY
Sept. 26, 1938,
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|-|_ A, THOMPSON
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$130,449
RAILWAY TRAFFIC CONTROLLING APPARATUS
Filed June 18, 1937
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Sept, 20, 1938.
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H. A. THOMPSON
2,130,449
RAILWAY TRAFFIC CONTROLLING APPARATUS
~ Filed June 18,
'
1937 , I
5 Sheets-Sheet 4
'
INVENTOR
H0wa1’dA.T
pron
BY
HA5’
ATTORNEY
Sept. 20, 1938.
H. A. THOMPSON
2,130,449‘
RAILWAY TRAFFIC CONTROLLING APPARATUS
Filed June 18, 1957
5 Sheets-Sheet 5
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INVENTOR
HowaPdA .
1221011012 .
BY
HIS
ATTORNEY
2,130,449
Patented Sept. 20, 1938
UNHTED STATES PATENT OFFICE
2,130,449
RAILWAY TRAFFIC CONTROLLING
APPARATUS
Howard A. Thompson, Edgewood, Pa., assignor to
The Union Switch & Signal Company, Swiss
vale, Pa., a corporation of Pennsylvania
Application June 18, 1937, Serial No. 148,909
14 Claims. (Cl. 246-41)
My invention relates to railway traffic con
trolling apparatus, and particularly to apparatus
for controlling a plurality of signal indications at
a given point over a single pair of line wires, by
5 control apparatus at a second point.
This application is a continuation in part of
my copending application for Letters Patent of
the United States, Serial No. 692,155, ?led Octo
ber 4, 1933, for Railway traffic controlling appa
10 ratus. Figs. 1a, lb, 10 and 3 of the present ap
plication correspond to Figs. 3a, 3b, 3c and 5, re
spectively, of the earlier application.
My invention is particularly adapted for, al
though not limited to, the control of automatic
15 signals each of which indicates traffic conditions
three or more blocks in advance, and also the
control of indicators for showing a plurality of
tra?ic conditions at a remote point.
I shall describe three forms of apparatus em
20 bodying my invention, and shall then point out
the novel features thereof in claims.
In the accompanying drawings, Figs. 1a, lb
and 10, when placed end to end in the order
named, with Fig. let on the left, constitute a dia
25 grammatic view showing one form of apparatus
embodying my invention for the control of four
block automatic signals; Figs. 2a and 2b, when
placed end to end, with Fig. 2a on the left, con
stitute a diagrammatic view showing a modi?ca—
30 tion of the apparatus shown in Figs. la, 1b and
1c for controlling three-block automatic signals,
and also embodying my invention; and Fig. 3 is
a diagrammatic View showing a modi?cation of
the apparatus shown in Figs. 1a, 1b and 10 for
35 controlling a plurality of tra?ic indication de
vices.
Similar reference characters refer to similar
parts in each of the several views.
Referring ?rst to Figs. 1a., 1b and 10, reference
40 characters
I and la designate the rails of a
stretch of railway track over which tra?ic nor
mally moves in the direction indicated by the ar
rows, which I shall assume to be the eastbound
direction. Rails ! and Ia are divided by ‘insu
45 ulated joints 2 into blocks AA—BB, BB-CC,
CC—DD and DD—EE. Each of these blocks is
further divided by other insulated joints 2 into
two sections, block AA—BB, for example, being
divided into sections AA-aa and act-BB. Each
50 track section is provided with a track circuit com
prising a battery 3 connected across the rails ad
jacent one end of the section, and a relay desig
nated by the reference character T with a dis
tinguishing exponent connected across the rails
55 adjacent the opposite end of the section.
Adjacent the entrance end of each of the blocks
which are shown complete, and also adjacent the
entrance end of the block to the right of point
EE shown in part in Fig. lo, a signal is located
for governing eastbound traf?c movements.
Each of these signals is designated by the refer
ence character S with a distinguishing exponent
according to its location. It is here assumed that
each of the signals S is of the color light type,
comprising an upper group of lamps designated
by the reference character u and a lower group
of lamps designated by the reference character d.
Each of these groups comprises a green or pro
ceed lamp 9, a yellow or caution lamp 'J, and a
red or stop lamp T. It is to be understood, how
ever, that my invention is not limited to signals
of this particular type.
_
The lighting of the lamps of each signal S is
controlled by two line relays, designated by the
reference characters V and X with the exponent 20
of the associated signal, which do not need to be
of the code following type, and by a slow release
relay, designated by the reference character '01
with the exponent of the associated signal, which
is controlled by a front contact of the associated
relay V. Each relay X is energized by current
from a recti?er, designated by the reference char
acter D with a corresponding exponent, which in
turn receives energy from the secondary winding
I87 of an associated transformer designated by
the reference character N with an exponent cor
responding to that of the associated signal. The
primary winding I86 of each transformer N is
connected in series with the associated relay V
in a line circuit controlled by the track relays for
the ?rst block ahead of the associated signal, and
by the relays V, X and 'u for the next signal in
advance, as well as by a coder designated by the
reference character C with a distinguishing ex
ponent for the next signal in advance.
40
Each of the coding devices C may be of an os
cillatory type operating at a low frequency of the '
order of 80 cycles per minute, and provided with
a self-control contact H, as well as with a con
tact I80 for periodically varying the current sup
plied to two line wires extending between signal
locations. The contacts of each coder C are
biased by a coil spring H] to the position shown
in the drawings, when the coder is deenergized.
In the arrangement here shown, contact I 80 of
each coder C is connected in multiple with a re
sistor unit l8l. The opening of contact I80 of
each coder C does not, therefore, open the asso
ciated line circuit, but merely reduces the current
?owing in the line circuit by introducing the re
2
2,130,449
sistance I8I in series with the battery Q which
supplies current to the line circuit.
As shown in Fig. 1c, the track section immedi
ately in advance of signal SE is occupied by a
train W. The indication displayed by each of the
signals S under this condition, and the meanings
of these indications, are given in the following
relay XD, back to battery QDI. Transformer NC
does not respond to the constant unidirectional
current ?owing in this circuit, and hence relay
XC remains deenergized. Relay VC is energized
in the reverse direction, and hence its polar con
tacts I9I and I96 are closed in their right-hand
positions. With front contact I91 of relay VC
energized, relay v0 is energized similarly to relay
'01), previously described.
table.
10
Indication displayed
1, _ ,
Signal
15
Meaning of indication
Group it
Group d
SE____ -_
Red _____ __
Red _____ _,
SD ____ _.
Yellow _____ __do ____ __
SC.... __ ___do ____ __
Yellow__._
First block ahead is occupied.
First block clear, second block is
occupied.
First
two
blocks
ahead clear,
third block occupied.
SB __._
Green ______ __do ____ __
First three blocks clear, fourth
block occupied.
SA.... _. ___do ____ __
Green_.___
First four blocks clear.
_
With relay VC energized in the reverse direc
tion, and with relay vc energized, lamp 3/ of
10
group 11. of signal S0 is energized by a circuit
which is similar to the circuit traced for lamp y
of group it of signal SD. Lamp y of group dof
signal SC is lighted by a circuit passing from 15
terminal B, through the front point of contact
I94 of relay 11°, contact I96 of relay VG in its
right-hand position, and lamp y to terminal 0.
Relay V13 and primary winding I86 of trans
20
I shall now describe the manner in which
these indications are displayed when train W
is in the section immediately ahead of signal SE.
Under these conditions, relay TEl is deenergized,
and hence the line circuit for relay VE and
transformer NE is open at contact I85 of relay
TEI. Relays VB, ‘013 and XE are therefore deen
ergized.
Lamp 1‘ of group u of signal SE is lighted by
a circuit passing from terminal B of a suitable
source of current which may be battery QEl,
through the back point of contact I92 of relay
0E, and lamp 1" to terminal 0 of the same source
of current. Lamp 1' of the lower group 42 is
lighted by a circuit passing from terminal B,
35 through the back point of contact I94 of relay
0E, and lamp r to terminal 0.
Relay VD is energized by constant current of
positive polarity in a circuit passing from bat
tery QEI, through a resistance unit I90, back
40 point of contact I83 of relay 1213, contact I84 of
relay T132, contact ~i85 of relay T131, winding of
relay VD, primary winding I86 of transformer
ND, and back point of contact I88 of relay 11E,
back to battery QEl. Transformer ND does not
45 respond to the constant unidirectional current
?owing in this circuit, and hence relay XD re
mains deenergized. With relay VD energized in
the normal direction, its front contact I9‘! is
closed, and its polar contacts I9I and I96 are
50 ‘closed in the left-hand position. With the front
contact of relay VD closed, relay 0D is energized
'by a circuit passing from terminal B, through
contact I9'I of relay VD, and the winding of relay
12D to terminal 0.
With relay 013 energized, and with relay VD
energized by current of positive polarity, lamp
y of group u of signal SD is lighted by a circuit
passing from terminal B, through front point of
contact I92 of relay 0D, back point of contact
I93 of relay XD, and lamp 1/ to terminal 0.
Lamp r of group d of signal SD is lighted by a
second circuit passing from terminal B, through
the front point of contact I94 of relay 12D, con
tact I96 of relay VD closed in the left-hand
65 position, back point of contact I95 of relay XD,
and lamp 1' to terminal 0.
Relay V0 is energized by constant current of
negative polarity passing from battery Qm,
through a resistor I90, contact I 9| of relay VD
70 in its left-hand position, back point of contact
I89 of relay XD, front point of contact I 88 of re
lay 1113, primary winding I86 of transformer NC,
winding of relay VG, contact I85 of relay T01,
contact I84 of relay T02, front point of contact
7-76 I83 of relay '01), and back point of contact I82 of
former N13 are energized by current of negative 20
polarity, periodically varied by coder CC, over a
circuit passing from battery Q91, through contact
I80 of coder C0 in multiple with a resistor I8I,
contact I9I of relay V0 in its right-hand posi
tion, back point of contact I89 of relay X0, front 25
point of contact I88 of relay '00, primary wind
ing ‘I86 of transformer NB, winding of relay VB,
contact I85 of relay T31, contact I84 of relay
T132, front point of contact I83 of relay v0, and
back point of contact I82 of relay XC, back to 30
battery Q01. Transformer NB and relay XB are
so proportioned that the periodically varied cur
rent supplied to primary winding I86 of trans
former NB will operate relay XB through recti
?er DB. The coded current of negative polarity 35
causes polar contacts I9I and I96 of relay VB
to be closed in their right-hand positions.
Each of the relays V is so constructed that its
polar contacts, after being closed in either posi
tion in response to energization of its control 40
winding by current of a corresponding polarity,
will remain closed in a corresponding position
until the control winding becomes energized by
current of the opposite polarity. Polar contacts
I9I and I96 of relay VB, after becoming closed
in their right-hand positions because of ener
gization of relay VB by coded current of nega
tive polarity, will therefore remain thus closed
until relay VB becomes energized by current of
the opposite polarity.
Lamp g of group a of signal SB is lighted by
a circuit passing from terminal B, through the
front point of contact I92 of relay 03, front
point of contact I93 of relay X3, and lamp g,
to terminal 0. Lamp y of group d‘ of signal
SB is lighted by a circuit which is similar to the
circuit traced for the corresponding lamp of
signal SC.
Relay VA and primary winding I86 of trans
former NA are energized by current of positive (-50
polarity, periodically varied by coder CB, over a
circuit passing from battery QBI, through con
tact I80 of coder CE in multiple with a resistor
I8I, front point of contact I82 of relay XB, front
point of contact I83 of relay 1213, contact I84 of _
relay TM, contact I85 of relay TAl, winding of
relay VA,v primary winding I86 of transformer
NA, front point of contact I88 of relay 11B, and
front point of contact I89 of relay XB, back to
battery Q31. Contacts I9I and I96 of relay VA 70
are therefore closed in the left-hand position,
and relay XA is energized.
Lamp 9' of group u of signal SA is therefore
lighted by a circuit which is similar to the circuit
traced for the corresponding lamp of signal SB.
2,130,449
periodically interrupted by the coder C in the
corresponding control circuits. Each relay V is
made slightly slow releasing in order to avoid
signal ?ashes when the current supplied to its
line circuit changes to coded current after being
energized by constant current of positive polarity.
Lamp 9 of group d of signal SA is lighted by a
circuit passing from terminal B, through the
front point of contact I94 of relay 11A, contact
I96 of relay VA closed in its left-hand position,
front point of contact I95 of relay XA, and lamp
9, to terminal 0.
Referring now to Figs. 2a and 2b, the stretch
The approach lighting relays ER are made slow
releasing so that their back contacts will remain
open while the associated circuit is being ener
of track shown here is the same as that shown in
Figs. 1a. and 1b» between points AA and DD.
gized by coded current.
10 Whereas in Figs. 1a, 1b‘ and 10, four complete
10
The coders C are similar to the coders 0 used
in the apparatus shown in Figs. 1a, 1b and -1c,
and operate also at a low frequency of the order
railway blocks are shown, only three such blocks
are shown in Figs. 2a and 2b.
The signals S shown in Figs. 2a and 2b are of
of 80 cycles per minute.
As shown in Fig. 2b, the track section imme 15
diately in advance of signal SDS is occupied by a
train W. The indication displayed to an ap
proaching train by each of the signals S under
this condition, and the meanings of these indi
the well-known upper right-hand quadrant sem
15 aphore type, each having a semaphore arm k op
erable to a horizontal position, to- a 45° position,
and to a vertical position. Each signal S has a
lamp 2', which, in conjunction with the signal
spectacle, displays a~red light corresponding to
cations, are given in the following table.
20 the horizontal position of the semaphore arm, a
20
yellow light corresponding to the 45° position of
Indication displayed
the semaphore arm, and a green light corree
sponding to the vertical position of the sema
phore arm. Each signal S has an auxiliary yel
25 low lamp Y which is at times lighted in conjunc
tion with the operation of the semaphore arm.
Signal
arm
-
Lights
pie
.
Scan". 45° ________ __ 1 yellow light___ First block clear, second
_
operated by each signal S. Each pole changer h
30 occupies one of its positions when the semaphore
arm of its signal is in the horizontal or stop posi
tion, and each pole changer it occupies its other
position when the arm of its signal occupies the
45° and vertical positions. Each signal S is con
35 trolled by tra?ic conditions three blocks in ad
SBS_____ 45° ________ ._ Zyellow lights.-.
block occupied.
First
2
blocks
ahead
clear, third block occu
_
30
pied.
8A5“..- V6IIZlC8.1-____ 1 green light___._ First 3 blocks clear. ’
I shall now describe the manner in which these
indications are displayed when train W is in the 35
section immediately ahead of signal SDS. Under
these conditions, relay TD1 is deenergized, and
vance.
The lighting of the auxiliary yellow lamp Y,
hence the line circuit for relay VDs and trans
former ND is open at contact I85 of relay Tm.
and the operation of the semaphore arm of each
signal S, are controlled by two line control relays
Relays VDs and XD are therefore deenergized.
40
With relays VDS and XD deenergized, the arm
of signal SDS occupies the horizontal ‘position.
With the arm of signal SDS inthe horizontal po
sition, light from lamp 2' of this signal will shine
40 V and X which are similar to line control relays
V and X shown in Figs. 1a, 1b and 10, except that
in Figs. 2a and 2b relays V are of the slow re
leasing type. Each relay X is energized by cur
rent from a recti?er D which in turn receives
45 energy from a transformer N, as in Figs. 1a, 1b
through the red portion of the spectacle of’ sig
nal S135, causing a red light to be displayed if
approach lighting relay ERD is deenergized due
and 1c.
The primary winding I86 of each transformer
45
to a second train entering block CC'—DD.
N is at times connected in series with the associ
ated relay V through a back contact of the as
sociated relay X, and a line circuit controlled
50
by the track relays for the ?rst block in advance
of the associated signal, and by the relays V and
X for the next signal in advance, as well as by
Relay VCs is energized by constant current of
negative polarity in a circuit passing from the 50
positive terminal of battery Q91, through a re
sistor 3021), contact 309 of pole changer hD op
erated by signal SDS, back point of contact 308
of relay X0, winding of relay VCS, primary wind
the pole changer h operated by the next signal
ing I86 of transformer No, contact I85 of relay 55
T01, contact I84 of relay T02, contact 306 of pole
changer M3, and the winding of approach light
ing relay ERD, back to the negative terminal of
55 in advance, and either by a coder C for the next
signal in advance, or independently of the coder
C for the signal in advance. At other times, pri
mary winding 586 of each transformer N is con
nected in series with a resistor 30'! through a
front contact of the associated relay X, in a line
circuit which is similar to the line circuit just re
ferred to, which is controlled by coder C for the
next signal in advance. Each of the circuits
which includes winding I86 of a transformer N,
battery Qm.
With relay VCS energized by current of nega 60
tive polarity, the arm of signal SCS is operated
to the 45° position by a circuit passing from ter
minal B of a suitable source of current, which
may be battery Q01, through the back point of
contact 3M of relay X0, contact 3 I5 of relay V“, 65
and the mechanism of signal SCS, to terminal 0‘
includes also an approach lighting relay desig
nated by the reference character ER, with a
of the same source of current.
distinguishing exponent, for the next signal in
70
Meaning of indication
ore
SD5_____ HorizontaL- lred light _____ __ First block ahead is occu
character it with a distinguishing exponent, is
advance.
ph
ema
A pole changer, designated by the reference
65
S
,
Each relay V, on account of being controlled
by a back contact of the associated relay X, will
become deenergized when the associated relay X
is energized because of periodically interrupted
current being supplied to its control circuit at
the next signal in advance. Relays V will, there
fore, not be operated by the current which is
With the arm of
signal SOS occupying the 45° position, light from
lamp 2' will shine through the yellow portion of
the spectacle of signal SOS, causing a yellow 70
light to be displayed if approach lighting relay
ERG is deenergized due to a train entering block
BB—CC. The circuit for lighting lamp 2' passes
from terminal B, through contact 3“) of relay
ER", and lamp i to terminal 0.,
75
4
2,130,449
With constant current flowing through pri
mary winding I86 of transformer NC, relay X0
will remain deenergized.
With relay Vcs energized and relay XC deen
ergized, relay V38 will be energized by constant
current of positive polarity in a circuit passing
from the positive terminal of battery Q01,
through resistor 3020., polar contact 303 of relay
VCs in its right-hand position, front point of con
10 tact 304 of relay VCS, back point of contact 305
of relay Xc, contact 306 of pole changer hC op
erated by signal S“, contact I84 of relay TBZ,
contact I85 of relay TBI, primary winding I86 of
transformer NB, winding of relay VBS, back point
15 of contact 308 of relay XB, contact 309 of pole
changer he, and the winding of approach lighting
relay ERG, back to the negative terminal of bat
tery Qcl.
With relay VBS energized by current of posi
20 tive polarity while relay X3 is deenergized, the
arm of signal S38 Will be operated to the 45° po
sition by a circuit similar to the circuit previous
ly traced for signal SOS, and which passes from
terminal B, through the back point of contact
3I4 of relay XB, contact 3| 5 of relay V135, and the
mechanism of signal SE5, to terminal 0. With
the arm of signal SBS in the 45” position, light
from lamp z'of signal SBs will shine through the
yellow portion of the spectacle of signal SE5,
causing a yellow light to be displayed if approach
lighting relay ERB is deenergized due to a train
occupying block AA-BB. With relay VBS ener
gized by current of positive polarity, a circuit
will be completed for ‘lighting the auxiliary yel
low lamp Y of signal S35 when relay ERB is de
energized, this current passing from terminal B,
through contact 3I0 of relay ERB, contacts 3“
and '3I2 of relay VHS, and lamp Y, to terminal 0.
It follows that signal SBS will at this time be
displaying an auxiliary yellow light below the
usual yellow light associated with the arm of
signal SBS.
With relay VBS energized by current of positive
polarity while relay XB is deenergized, a circuit
will be completed for energizing relay VAS, pass
ing from the positive terminal of battery QB1,
through contact 30I of coder CB which is con
tinually closing and opening its contact 30I at a
frequency of 80 per ‘minute, contact 303 of relay
V35 in its left-hand position, the front point of
contact 304 of ‘relay VBS, back point of contact
305 ‘of relay XB, contact 306 of pole changer hB
operated by signal SE5, contact I84 of relay TAZ,
contact I85 of relay TAI, primary winding I86
of transformer NA, winding of relay VAS, back
point of contact 308 of relay XA, contact 309 of
pole changer hB, and the winding of approach
lighting relay ERB, back to the negative terminal
of battery Q31. Since this circuit passes through
60 contact 30I of coder CB, the circuit for relay VAs
and primary winding I86 of transformer 'NAis en
ergized by periodically varied' current of posi
tive polarity. With periodically varied current
thus supplied to winding I86 of transformer NA,
65 relay XA will be energized by current generated
in the secondary winding I81 of transformer NA
and passing through recti?er DA to the winding
of relay XA. Relay XA will, therefore, close its
contact ‘308 at the front point, causing the .cir
70 cuit for winding I86 of transformer NA to now
pass through a resistor 30‘!A and the front point
of contact 308 of relay XA, instead of through
the winding of relay VAs and the back point of
contact 308 of relay X“. With the circuit for re
3175 lay VAS thus opened at the back point of con
tact' 308 ‘of relay X4, relay VAS will be deen
ergized.
With relay XA now'energized, a circuit will be
completed for operating the arm of signal SAs
to the 45° position, this circuit passing from ter
minal B, through the front point of contact 3I4
of relay X“, and the mechanism of signal SAS, to
terminal 0. A circuit will also be completed for
operating the arm of signal SAS from the 45°
position to the vertical position, this circuit pass 10
ing from terminal B, through contact 313 of re
lay XA, and the mechanism of signal S“, to
terminal 0. The,arm of signal SAS will therefore
be operated to the vertical position, and light
from lamp i of signal SAs will shine through the
green portion of the spectacle of signal S“, caus
ing a green light to be displayed when approach
lighting relay ERA is deenergized due to a train
occupying the block in the rear of signal 8“.
With relay VAs deenergized, and with relay XA
energized, a circuit will be completed for en
ergizing the relay V and the primary winding I86
of the transformer N for the next signal in the
rear of signal SAS, by current of positive polarity
passing from the positive terminal of battery QM,
through contact 30I of coder CA, front point of
contact 305 of relay XA, and thence by a path
which is similar to that previously traced for
relay VAS and transformer NA, back to the nega
tive terminal of battery QM.
'
.30
In Fig. 3, line control relays V and X are oper
ated by periodically varied current of positive or
negative polarity, and relay V is also operated by
constant current of positive or negative polarity
similarly to the manner in which relays V and X :
of Figs. la, lb'and 1c are operated.
In Fig. 3, the
various control currents are selected by track re
lays 'I‘1 and T2, instead of by line relays as in
Figs. 1a, 1b and 10. Instead of controlling a
signal S, relays V and X, in Fig. 3, control two in 40
dicator lamps designated by the reference char
acters e51 and e52.
As shown in the drawings, both relays T1 and
T2 are energized. Constant current of positive
polarity is therefore supplied for energizing relay
V by a circuit passing from portion :12 of battery
Q, through the front point of contact 222 of re
lay T1, front point of contact 223 of relay T2,
winding of relay V, and the primary winding 224
of transformer N, back to battery Q. Trans
former N does not respond to this constant cur
rent, and hence relay X remains deenergized.
Since relay V is energized by current of positive
polarity, its polar contact 229 is open. Both
lamps e51 and e52 are therefore deenergized.
I shall now assume that a train enters the
track section with which relay T1 is connected,
causing relay T1 to become deenergized. Relay
T1, upon becoming deenergized, causes a coder 0
to become energized by a circuit passing from ter 60
minal B, through contact 2280f relay T1, con
tact II of coder '0, and winding of coder 0, to
terminal 0. Current of positive polarity periodi
cally interrupted by coder C at a frequency of
the order of 80 times per minute, will therefore 65
be supplied by portion Q2 of battery Q, through
contact 22I of coder C, back point of contact 222
of relay T1, and thence over the circuit previously
traced, back to battery Q. Since the polarity of
the current by which relay V is energized is still 70
positive, contact 229 of relay V will remain open.
Transformer N and relay X are so proportioned
that the coded current now supplied to trans
former N will cause relay X to become energized.
With relay X energized, lamp e51 will be lighted 75
5
2,130,449
by its circuit passing from terminal B, through
contact 230 of relay X, and lamp e51, to ter
minal 0.
If now the train proceeds into the section with
which relay T2 is connected, coded current of
connected in series with said relay, a control de
vice controlled by said transformer responsive to
energization of said transformer by said periodi
cally varied currents carried by said conductors
but not responsive to energization of said trans—
negative polarity will be supplied by portion (11 of
former by said continuous currents, railway
battery Q to relay V and transformer N, by a
traffic indication means, and means controlled
circuit passing from portion q1 of battery Q,
through primary winding 22¢ of transformer N,
winding'of relay V, back point of contact 223 of
relay T2, back point of contact 226 of relay T1,
by said polarized relay and by said control device
for selectively controlling said traf?c indication
means according to the form of current supplied 10
to said conductors.
2. In combination, a pair of conductors, means
for supplying said conductors with continuous
current of positive polarity, means for supplying
said conductors with continuous current of nega 15
tive polarity, means for supplying said conductors
now be energized on account of transformer N with periodically varied current of a given po
being supplied with coded current of negative 'larity, a polarized relay connected across said
polarity. Both lamps e51 and e52 will therefore be conductors responsive to each of said continuous
20 lighted as long as the train occupies both the track currents carried by said conductors, a trans 20
former connected in series with said relay, a con
sections shown in the drawings.
trol device controlled by said transformer re
If now the train leaves the ?rst section, per
and contact 22'! of coder C, back to battery Q.
Since the polarity of the current is now negative,
contact 229 of relay V will become closed, and
hence lamp 652 Will be energized by its circuit
including contact 229 of relay V. Relay X will
mitting relay T1 to again become energized, but
continuing to deenergize relay T2, relay V will be
25 energized by constant current of negative polarity,
supplied by portion q1 of battery Q over the cir
cuit previously traced as far as the back point of
way trai?c indication means, and means con
contact 223 of relay T2, thence passing through
the front point of contact 226 of relay T1, back
to battery Q. With relay V thus energized by
current of negative polarity, lamp e52 will con
trolled by said polarized relay and by said con
trol device for selectively controlling said traffic
tinue lighted. Since the current now supplied to
transformer N is constant, relay X will become
deenergized, therefore opening the circuit for
lamp 651. Hence while relay T1 is energized and
relay 'I‘2 is deenergized, lamp e52 only will be
lighted.
‘
From the foregoing description and the accom
panying drawings, it will be understood that my
40 invention provides apparatus at a given control
point for selectively supplying, to a single pair
of conductors, constant unidirectional current
of normal and reverse polarities, and unidirec
tional current which is periodically varied at a
45 frequency of the order of 80 cycles per minute.
My invention also provides apparatus arranged
to selectively respond to each of these forms of
current carried by the pair of conductors.
In Figs. 1a, 1b1 and 1c and Figs. 2a and 22)‘, my
invention is applied to four-block and three
block automatic signal control systems, respec
tively. In Fig. 3, a modi?cation of the apparatus
is shown, by which a plurality of track circuit
indications may be controlled over a single pair
_ of line wires.
Although I have described only a few forms of
railway tramc controlling apparatus embodying
my invention, it is understood that various
changes and modi?cations may be made therein
within the scope of the appended claims without
departing from the spirit and scope of my in
vention.
Having thus described my invention, what I
claim is:
65
sponsive to energization of said transformer by
said periodically Varied current carried by said
conductors but not responsive to energization of 25'
said transformer by said continuous current, rail
1. In combination, a pair of conductors, means
for supplying said conductors with continuous
current of positive polarity, means for supplying
said conductors with continuous current of nega
tive polarity, means for supplying said conductors
70 with periodically varied current of positive
polarity, means for supplying said conductors
with periodically varied current of negative po
larity, a polarized relay connected across said
conductors responsive to each of said forms of
75 current carried ‘by said conductors, a transformer
indication means according to the form of cur
30
rent supplied to said conductors.
3. In combination, a pair of conductors, means
for supplying said conductors with continuous
current of positive polarity, means for supplying
said conductors with continuous current of nega 35
tive polarity, means for supplying said conductors
with periodically varied current of a given po
larity, a polarized relay and a transformer con
nected across said conductors selectively con
trolled by said forms of current carried by said 40
conductors, railway traffic indication means, and
means controlled by said polarized relay and by
said transformer for selectively controlling said
tra?ic indication means.
'
4. In combination, a pair of conductors, means 45
for supplying said conductors with constant cur
rent of positive polarity, means for supplying said
conductors with constant current of negative po
larity, means for supplying said conductors with
periodically varied current of a given polarity, a 50
polarized relay, a transformer, a resistor, a sec
ond relay, a circuit including the winding of said
polarized relay and a back contact of said second
relay as well as the primary winding of said
transformer for energizing said transformer by 55
periodically varied current carried by said con
ductors, a second circuit including said resistor
and a front contact of said second relay as well
as the primary winding of said transformer for
energizing said transformer by periodically varied
current carried by said conductors, means con
trolled by said transformer for energizing said
second relay when said transformer is energized
by periodically varied current, normal and re
verse circuits including the winding of said polar
ized relay and a back contact of said second relay
as well as the primary winding of said trans
former for energizing said polarized relay by
constant current carried by said conductors, rail
way tra?ic governing apparatus, and means con 70
trolled by said polarized relay and by said sec
ond relay for selectively controlling said traf?c
governing apparatus according to the form of
current carried by said conductors.
5. In combination, a stretch of railway track, 75
6
2,130,449
a pair of conductors, a polarized relay and a
transformer connected across said conductors,
means controlled by ?rst and second traffic con
ditions for said stretch for supplying constant
current of normal and reverse polarities respec
tively to said conductors, means controlled by
third and fourth tra?ic conditions for said stretch
for supplying periodically varied current of nor
mal and reverse polarities respectively to said
conductors, and indication means selectively con
trolled by said polarized relay and by said trans
former for displaying four different indications
one for each of said four traffic conditions.
6. In combination, a stretch of railway track
15 divided into a ?rst and a second section, a first
and a second track circuit including a track re
lay for each of said sections respectively, a pair
of conductors, a polarized relay and a trans
former connected across said conductors, means
20 controlled by a front contact of each ofsaid track
relays for supplying constant current of positive
polarity to said conductors, means controlled by
a front contact of the ?rst track relay and by a
back contact of the second track relay for sup
25 plying constant current of negative polarity to
said conductors, means controlled by a back con
tact of said ?rst track relay and by a front con
tact of said second track relay for supplying pe
riodically varied current of positive polarity to
30 said conductors, means controlled by a back con
tact of each of said track relays for supplying
9. In combination, a stretch of railway track
divided into a plurality of consecutive blocks, a
pair of conductors for each block, means for each
block for supplying the conductors for the block
next in the rear with constant current of a given 5
polarity or with constant current of the opposite
polarity or with periodically varied current, a
polarized relay and a transformer connected in
series across each of said pairs of conductors se
lectively controlled by said forms of current car 1O
ried by said conductors, and a signal for each
block capable of displaying several distinct clear
block indications selectively controlled by said
polarized relay and by said transformer.
10. In combination, a stretch of railway track 15
divided into a plurality of consecutive blocks, a
pair of conductors for each block, means for each
block for supplying the conductors for the block
next in the rear with constant current of a given
polarity or with constant current of the opposite 20
polarity or with periodically varied current, a
polarized relay for each block, a transformer for
each block, a second relay for each block con
trolled by the transformer for the same block, a
resistor for each block, a circuit for energizing 25
the polarized relay for each block by constant
current including the winding of the polarized
relay connected across the conductors for the
same block in series with the primary winding of
the transformer .and a back contact of the sec 30
ond relay for the same block, a second circuit in
periodically varied current of negative polarity
cluding the winding of the polarized relay for
to said conductors, and indication means selec
each block connected in series with the primary
winding of the transformer and a back contact
of the second relay for the same block for ener 35
tively controlled by said polarized relay and by
35 said transformer for displaying four distinct'in
dications corresponding to said four forms of cur
rent carried by said conductors. ‘
'7. In combination, a stretch of railway track
divided into a ?rst and a second section, a ?rst
40 and a second track circuit including a track re
lay for said ?rst and second sections respectively,
a pair of conductors, a polarized relay and a
transformer connected across said conductors,
means for supplying constant current of positive
45 or negative polarity as well as periodically varied
current of positive or negative polarity, a ?rst
‘circuit including a front contact of each of said
track relays and a second circuit including a back
contact of each of said track relays as well as a
50 third circuit including a front contact of a given
one of said track relays and a back contact of the
second of said track relays‘ and also a fourth cir
cuit including a back contact of said given track
relay and a front contact of said second track
55 relay and each of said circuits including said
conductors and energized by current of one of
said forms from said supply means, and indica
tion means selectively controlled by said polarized
relay and by said transformer for displaying four
60 different indications one for each of said four
forms of current carried by said conductors.
8. In combination, a stretch of railway track
divided into a plurality of consecutive blocks, a
pair of conductors for each block, means for each
.65 block for supplying the conductors for the block
next in the rear with constant current of a given
polarity or with constant current of the opposite
polarity or with periodically varied current, a
polarized relay and a transformer connected
70 across each of said pairs of conductors selec
tively controlled by said forms of current carried
by said conductors, and a signal for each block
capable of displaying several distinct clear block
indications selectively controlled by said polarized
75 relay and by said transformer.
gizing the transformer by periodically varied cur
rent, a third circuit for energizing the same
transformer including a front contact of the sec
ond relay and the resistor for the same block,
and a signal for each block capable of display 40
ing several distinct clear block indications selec
tively controlled by the polarized relay and by the
transformer for the same block.
11. In combination, a stretch of railway track
divided into a plurality of consecutive blocks, a
pair of conductors for each block, means for each
block for supplying the conductors for the block
next in the rear with constant current of a given
polarity or with constant current of the opposite
polarity or with periodically varied current, a
polarized relay and a transformer connected 60
across each of said pairs of conductors selective
ly controlled by said forms of current carried by
said conductors, means controlled by periodically
varied current carried by said conductors for dis
connecting one side of said relay from said con 55
ductors, and a signal for each block capable of
displaying several distinct clear block indications
selectively controlled by said polarized relay and
by said transformer.
12. In combination,
a pair of conductors,
60
means for supplying said conductors with con~
tinuous current of positive polarity, means for
supplying said conductors with continuous cur
rent of negative polarity, means for supplying
said conductors with periodically varied current 65
of a given polarity, a polarized relay and a trans¢
former connected across said conductors selec
tively controlled by said currents carried by said
conductors, means controlled by periodically 70
varied current carried by said conductors for
disconnecting one side of said relay from said
conductors, and a signal capable of displaying
several distinct indications selectively controlled
by said polarized relay and by said transformer.
7
2,130,449
13. In combination, a pair of conductors,
means for supplying said conductors with con
tinuous current of positive polarity, means for
supplying said conductors with continuous cur
rent of negative polarity, means for supplying
said conductors with periodically varied current
of a given polarity, a polarized relay and a trans
former connected across said conductors selec
tively controlled by said currents carried by said
10 conductors, means controlled by said transformer
for disconnecting one side of said relay from said
conductors when periodically varied current is
supplied to said conductors, and a signal capable
of displaying several distinct indications selec
tively controlled by said polarized relay and by
said transformer.
14. In combination, a pair‘ of conductors,
means for supplying said conductors with contin
uous current of positive polarity, means for sup
plying said conductors with continuous current
of negative polarity, means for supplying said
conductors with periodically varied current of
positive polarity, means for supplying said con
ductors with periodically varied current of nega
tive polarity, a polarized relay connected across
said conductors responsive to each of said forms
of current carried by said conductors, a trans
former connected in series with said relay and 10
responsive to said periodically varied currents but
not to said continuous currents, a plurality of
railway tra?ic governing devices, and. means con
trolled by said polarized relay and by said trans
former for selectively controlling said traf?c gov 15
erning devices.
'
HOWARD A. THOMPSON.
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