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Патент USA US2123962

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July 19, 1938.
G. R. PFLASTÉRER
2,123,962
RAILWAY SIGNALING
Filed March 12, 1936
8 Sheets-Sheet l
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July 19, 1938.
G. R. PFLAsTr-:RER
2,123,962;
RAILWAY SIGNALING
Filed March l2, 1936
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July 19, 1938.
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Patented July 19, 1938
UNITED STATES farisei“ orme-.E
2,123,962
RAILWAY SIGNALING
George R.. Pflaster-er, Swissvale, Pa.,rassignor to
The Union Switch & Signal Company, Swiss
vale, Pa., a corporation‘of Pennsylvania
Application March 12, 1936, Serial No. 68,497
15 Claims.
My invention relates to railway signaling, and
particularly to signaling involving wayside sig
nals located along a trackway for governing the
passage of trains.
A feature of my invention is the provision of
QI
novel and improved apparatus for establishing a
distinctive control for each of three sections in
therear of an occupied section. Each distinctive
control iseiîective to cause a corresponding aspect
10 of the wayside signals whereby there is produced
a three block, four indication system of signaling.
The apparatus provided by this invention is an
improvement on the systems shown in the appli
cation of Howard A.V Thompson, Serial No.
1
692,155, filed October 4, 1933, for Railway trañic
controlling apparatus, and in the application of
Henry S. Young, Serial No. 66,002, ñled February
27, 1936, for Railway signaling.
I will describe several forms of apparatus each
embodying my invention, and will then point out
the novel features thereof in claims.
In the accompanying drawings, Figs. 1A and 1B
are diagrammatic views which, when placed end
to end in the order named, illustrate one form of
25 apparatus embodying my invention. Figs. 2A
2
and 2B are diagrammatic views which, when
place-d end to end in the order named, illustrate
another form of apparatus embodying my inven
tion. Figs. 3A and 3B are diagrammatic views
'30 which, when placed end to end in the order
named, illustrate still another form of apparatus
embodylngmy invention. Fig. 4 is a diagram
matic view illustrating in detail a portion of the
(Cl. 246-50)
with a prefix the same .as the numerical prefix
inthe reference character for the associatedsub
section.
To Vgovern .the passage of trains through'the
stretch of railway,.gJ wayside signal, designated
by a suitable distinguishing reference character,
is located at the entrance to each track section.
Each ofy these signals comprises an upper unit U
and alower unit L. These units may take any
one of several forms of signal mechanism-such 10
as searchlight, semaphore, color light or position
light. As hereshown, each upperunit is a color
light signal comprising a green lamp `Gea yellow
lamp Y, and a redlamp R; and each lower unit is
a color light signal comprising a, green lamp G 15
and a red lamp R.
Each section isprovided with` apolarized- direct
current signal control relay designated by the
referencecharacter H vvitha.` preñx the same as
the reference character of the associated signal
and with an Aalternating currentsignal control
relay designated by the reference character J with
a -preñx the .same as the reference character of
the associatedsignal.
~
Each section is provided with aline circuit in 25
cludingapair Ofiline wires extending'to the sig
nal nextin advance ancleachfof which includes
a front` contact of each of the associated `track
relays.
f
-
Each relayH is connected directly to the asso
ciated-line wires and each relay J is also ~con
nected tothe associated line wires'through a, con
denser designatedby the reference ycharacter D
apparatus illustrated in the foregoing figures.
.with a prefix the same as the reference >character
35 Figs. 5A and 5B are diagrammatic views which,
of the associated signal.
The condensers D Vprevent the ñow'of direct
when placed end to end in the order named, il
lustrate still a diiîerent form of apparatus em
bodying my invention.
Similar reference characters refer to similar
40 parts in each of the several Views.
rlf'teferring ñrst to Figs. lA and 1B, the reference
characters 8 and 9 designate the rails of a stretch
of railway track along which trañic normally
moves in the direction indicated by the arrows.
These lrails are divided by insulated joints I4 into
a plurality oi track sections or blocks W-X,
X-Y, and Y-Z.
Each track section is divided by insulated joints
I4 into at least two subsections iT, 2T, 3T, 4T,
etc. Each subsection is provided with a track
circuit which includes a track battery l5 con
nected across the rails at one end of the sub
section and a track relay connected across the
other end of the subsection. The track relays
are designated .by the reference character TR
'20
current in the alternating current-relays J and
the high impedance of the direct current relays I-I
prevents the flow of alternating current in these
relays.
40
Each section is provided with a suitablesource
of direct current, the terminals of which are‘des
ignated by the reference characters B and C.
Each section is also provided with a device for 45
converting the direct current into alternating
current and designated by the reference character
A with a preñx the same as the reference char
acter of the associated signal. As here shown, the
devices A are the well known tuned reed alter 50
nators.
Associated with each alternator A is a trans
former N, the primary winding of which is con
nected to the associated alternator and the sec
ondary'winding of which is at times eiïective to 55
2
2,123,962
supply alternating current to the line circuit for
the section next in rear.
,
As will be explained more in detail hereinafter,
the relays H and J control the line circuit for
the section next in rear in such manner that this
line circuit is supplied with direct current of one
polarity or with direct current of the other po
front contact ¿i2 of relay ETR, front contact 43 of ew
relay GTR, back point of contact 44 of relay I3H,
larity or with alternating current.
to the other terminal of primary winding 36.
Each of the color light signals is controlled by
When relay I2J is energized and relay I2H is de
energized, relay II H is energized by direct cur
manner: When both relays are deenergized (see
rent in the reverse direction‘over a circuit which
signal I3) the red lamp R of the upper unit U of
that signal is lighted by a circuit which passes
from terminal B through back point of contact
IG of relay ISH, back point of contact I1 of relay
l3J, and lamp R to terminal C; and the red lamp
passes from terminal B, at signal I2, through
front point of contact 4l of relay IZJ, back point
of contact 43 of relay IZH, front contact 49 of
relay ¿ITR, front contact 56 of relay STR, relay
I IH, front contact 5l of relay 3TR, front contact
52 of relay @.TR, back point of contact 53 of relay
I2H, and front point of contact 54 of relay IZJ to
terminal C. When relay IIH is energized, relay
a circuit which passes from terminal B through
25
30
35
40
back point of contact I8 of relay I3H and lamp R
to terminal C. Signal I3, therefore, displays a
red light above a red light to indicate “stop”.
When relay H is deenergized and relay J is ener
gized (see signal I2) the yellow lamp Y of the
upper unit U of that signal is lighted' by a circuit
which passes from terminal B through back point
oi Contact I9 of relay I2H, front point of contact
20 of relay I2J, and lamp Y to terminal C; and the
red lamp R of the lower unit L of that signal is
lighted by a circuit which passes from terminal
B through back point of contact 2I of relay IZH
and lamp R to terminal C. Signal I2, therefore,
displays a yellow light above a red light to indi
cate “prepare to stop at next signal”. When relay
H is energized in the reverse direction (see signal
I I) the yellow lamp Y ofthe upper unit U of
that signal is lighted by a circuit which passes
from terminal B through front point of contact
22 of relay IIH, reverse polar contact 23-24 of
relay I IH, and lamp Y to terminal C; and the
green lamp G of the lower unit L of that signal
is lighted by a circuit which passes from terminal
B through front point of contact 25 of relay I IH,
reverse polar contact 26-21 of relay IIH, and
lamp G to terminal C. Signal II, therefore, dis
45 plays a yellow light above a green light to indi
cate “approach next signal at medium speed”.
When relay H is energized in the normal direc
tion (see signal I0) the green lamp G of the upper
unit U of that signal is lighted by a circuit which
50 passes from terminal B through front point of
contact 28 of relay I 0H, normal polar contact
23-29 of relay IDH, and lamp G to terminal C;
and the red lamp R of the lower unit L of that
signal is lighted by a circuit which passes from
55 terminal B through front point of contact 3l! of
relay IOH, normal polar contact 2li-3| of relay
IDH, and lamp R to terminal C. Signal I I), there
fore, displays a green light above a red light to
60
back point of contact 45 of relay ISJ and wire 46
the associated relays H and J in the following
R of the lower unit L of that signal is lighted by
20
ISN through wire 31, back point of contact 38 of
relay I 3J, back point of contact 39 of relay I 3H,
front contact 40 of track relay GTR, front contact
4I of track relay STR, relay I 2J, condenser I2D,
indicate “proceed at normal speed”.
As shown in the drawings, the section immedi
ately to the right of point Z is occupied by a train
K, so that both relays ISH and I3J are deener~
gized. When relays I 3H and I3J are deenergized,
alternator I3A is supplied with direct current
65 energy over a circuit which passes from terminal
B through back contact 32 of relay I 3H, back con
tact 33 of relay I3J, wire 34, and alternator I3A
to terminal C, so that alternator I 3A supplies
alternating current to the primary winding 35 of
transformer I3N. When alternating current is
supplied to primary winding 35 and both relays
I3H and I3J are deenergized, alternating cur
rent relay I2J is energized by alternating cur
rent over a circuit which passes fromvone ter
75 Ininal of secondary winding 36 of transformer
50H is energized by direct current in the normal
direction over a circuit which passes from ter
minal B through front point of contact 55 of re
lay IIH, front contact 5E of relay ZTR, front
contact 5l or" relay ITR, relay ISH, front contact
58 of relay ITR, front Contact 59 of relay ZTR,
and front point of contact 68 of relay IIH to
terminal C. It will be readily apparent that
When relay HUH is energized the line circuit for
the section next in rear of section W-X is sup
plier over front contacts of relay ISH, with direct .
current energy in the normal direction so that
the signal (not shown) for such rear section is
displaying its normal proceed indication.
'I'o sum up thus far, each signal is controlled
by a direct current polarized signal control relay
and by an alternating current signal control relay
both receiving energy over a line circuit which is
controlled by the track relays of the section with
which the signal is associated- and by the signal
control relays of the signal next in advance.
When both signal control relays are deenergized
the associated signal indicates ‘ top” and the line
circuit to the rear is supplied with alternating
current energy only. When the alternating cur
rent relay alone is energized the associated signal »
indicates “prepare to stop at next signal” and
the line circuit to the rear is supplied only with
direct current of reverse polarity. When the
direct current relay is energized in the reverse
direction the associated signal indicates “ap
proach next signal at medium speed” and the
line circuit to the rear is supplied only with direct
current of normal polarity. When the direct cur
rent relay is energized in the normal direction the
associated signal indicates “proceed at normal
speed” and the line circuit to the rear is supplied
orLly with direct current of normal polarity so
that the signal controlled by such rear line cir
cuit will also display the normal proceed indica
tion.
It will be noted the alternator A at each signal
is caused to operate only when the associated sec
tion is occupied by a train. Since under ordinary
conditions the stretch of railway will be unoccu
pied the greater part of the time, the energy con
sumed by the alternators will be relatively small.
This feature, therefore, provides a simple and
economical method for providing alternating cur
rent at each signal which method is particularly
desirable when the direct current energy is sup
plied by primary batteries Which must be renewed
from time to time.
It will also be noted the polarized signal con
trol relays H are of the retained neutral type,
that is, the neutral armatures of these relays do
50
55
60
65
70
75
2,123,962
not release during changes of polarity. This
characteristic prevents momentary hashing of a
red lamp» of the associated signal and tumble
down of the signal control relays to the rear. For
example, when the train K vacates the section to
the right of location Z so that the line circuit for
the section X-Y is supplied with direct current
energy in the normal direction to cause signal
l! to display a green light above a red light in
10 stead of a yellow light above a green light, the
neutral contacts oi’ relay l IH will remain in their
energized position, as shown in Fig. 1A, during
the period of change in polarity. Since 'the back
points of the neutral contacts of relay HH do not
, become closed, the circuit for the red lamp R of
the upper unit U of signal Il cannot become
closed to cause a momentary flash of that lamp,
and since the front points of the neutral contacts
of relay l IH do not become opened, the line cir
cuit for the section W-X will remain closed so
that the energization of relay WH will not be dis
turbed.
Consequently, momentary hashing of
the red lamps and successive tumble-down of the
signal control relays to the rear are avoided.
25
Each of the retained neutral polarized signal
control relays H functions, during pole-changing
periods, in a manner similar to that described for
relay MH.
,
Referring next to Figs. 2A and 2B, the sys
^ tem illustrated herein functions in many respects
similar to that described for the system illus
trated in Figs. 1A and 1B. The principal diiîer
ence is in the type of Wayside signal utilized. As
here shown, each upper unit UA is a signal mech
~ In ~ anism of the searchlight type which may be sub
_o
.
stantially as described and claimed in United
States Letters Patent No. 1,864,224, issued June
21, 1932, to' VV'. B. Wells for Light signal; and
each lower unit LA is a lamp Y capable of dis
playing a yellow light. For the purpose of this
application it is deemed suñ-lcient to but brieiiy
describe these searchlight signals. Upper unit
UA of signal l0, for example, includes a pivotally
mounted rotor 62 controlled by a permanent
magnet (not shown) and by an operating wind
ing 63. Energization of operating Winding B3 by
current of one polarity causes rotor 62 to be
rotated in one direction, moving the signal to
the clear indication position; energization of
3
character of the associated signal and connected
in series With the line circuit for the section next
in rear only when that line circuit is supplied
with direct current energy.
‘ Each lamp E is controlled by a back contact
of the associated relay ER so that whenever the
approach lighting relay is deenergized the associ
ated lamp is lighted. For example, the lamp 13E
is controlled over an easily traced circuit which
includes back contact Sl of relay ISER.
Since 10
each of the other lamps E` is controlled in a sim
ilar manner by the associated relay ER, it Will be
obvious _that each lamp E' will be lighted When
ever the associated relay ER is deenergized; that
is, Whenever the line circuit controlling such re 15
lay is opened or is supplied with alternating cur
rent energy. In other Words, the relays ER will
become deenergized Whenever the associated sec
tion or the section next in rear becomes occu
20
pied by a train.
Each section is provided with the usual direct
current polarized relay signal control relay H of
the retained neutral type and with a direct cur
rent neutral signal control relay V.
Both signal control relays receive energy over 25
the usual line circuit extending to the signal next
in advance and controlled by the track relays of
the associated section and by the two signal con
trol relays of such advance signal. The polarized
relay H is connected directly to the associated
line circuit and the neutral relay V is connected
to the associated line circuit through a rectifier,
a transformer and a resistor designated bythe
reference characters Q, M, and E', respectively,
each with a prefix the same as the reference
character of the associated signal.
The resistors F will prevent the excessive flow
of direct current in the primary windings of the
transformers M, and the transformers M Will
prevent the flow oi any direct current in the re 40
lays V. The high impedance of >the direct cur
rent relays H will prevent the flow of alternating
current in these relays.
Associated with each section is the usual al
ternator A and transformer N both of which are
controlled by the associated relays H and V in a
manner similar to that described for the appa
ratus shown in Figs. 1A and 1B. That is, when
ever a section is occupied by a train, the alter
operating winding 53 b-y current of the other
nator A is connected to the source of direct cur
polarity causes rotor S2 to be rotated in the op
posite direction to move the signal to the caution
rent and the secondary winding 3S of the trans
indication position; while deenergization of oper
ating Winding @El permits rotor 62 to be released
by gravity to a center position, which is the stop
indication position. Associated with rotor G2 is
a signal lamp MBE. As pointed out in detail in
the aforementioned patent, when rotor 62 is ro
tated to the clear position, a green colored fil
GO ter G is moved in front of lamp IDE', so that a
green signal light is displayed when lamp lllE is
lighted. When rotor S2 is rotated to the caution
indication position, a yellow colored filter Y is
moved in front of lamp IDE so that a yellow
“ signal light is displayed When lamp HlE is lighted.
In like manner, the positioning of rotor 62 in the
center position moves a red colored filter R in
front of lamp IDE so that a red signal light is dis
played When lamp IQE is lighted.
Each of the other searchlight signals functions
in a manner similar to- that described for signal
IB.
,
Each section is provided with an approach
lighting relay designated by the reference char
v acter ER with a prefix the s_ame as the reference
50
former N is connected to the line circuit for the
section next in rear to supply that line circuit
with alternating current energy.
The relays H and V control the associated sig 55
nals in the following manner: When both relays
H and V are deenergized (see signal I3) both
operating windings 63 of the upper unit UA and
lamp Y of the lower unit LA of that signal are
deenergized so that, With lamp l3E lighted, the 60
signal displays a single red light to indicate
“stop”. When the neutral relay N is energized
and the polarized relay is deenergized (see sig
nal l2) operating Winding 625 of the upper unit
UA of that signal is energized in the reverse 65
direction by a circuit which passes from ter
minal B through front contact 64 of relay l2V,
back point of contact 65 of relay EZH, operating
winding §53, back point of contact 66 of relay
IQH, and iront contact 61 of relay 82V to ter 70
minal C so that, when lamp lEE is lighted, sig
nal l2 is in condition to display a single yellow
light to indicate “approach next signal prepared
to stop”. When relay H is energized in the re
verse ydirection (see signal il) operating Wind
4
2,123,962
ing 63 of upper unit UA of that signal is ener
gized inthe reverse direction by a circuit which
passes from terminal B through reverse polar
contact 68-69 of relay IIH, front point of con
tact ‘I0 of relay IIH, winding 63, front point of
contact 1I of relay I IH, and reverse polar con
tact 12-13 of relay IIH to terminal C; and the
lower unit LA of that signal is energized by a
circuit which passes from terminal B through
reverse polar contact 'I4-‘I5 of relay IIH, front
contact ‘I6 of relay HH and lamp Y to terminal
C. Signal I I, therefore, when lamp I IE is lighted
is in condition to display a yellow lampI above a
4yellow lamp to indicate “approach next signal
at medium speed”. When relay H is energized
in the normal direction (see signal I0) operating
winding 63 of upper unit UA of that signal is
energized by a circuit which passes from termi
nal B through normal polar contact 'I1-'I2 of
relay IDH, front point of contact 'I8 of relay IDH,
operating winding 63, front point of contact 19
of relay I 0H, and normal polar contact 69-80
of relay IDH to terminal C, so that, when lamp
IDE is energized, signal IU is in condition to dis
xo Cl play a single green light to indicate “proceed at
normal speed”.
Since the relays H and V control the line cir
cuits for the section next in rear in exactly the
same manner as described for the relays H and
30
J, shown in Figs. 1A and 1B, it is thought that
a detailed explanation is not required for the
apparatus shown in Figs. 2A and 2B. It will be
considered suiiicient to state that when both re
lays H and V are deenergized, the line circuit
to the rear will be supplied with alternating cur
rent energy only, when relay V only is energized,
the line circuit to the rear will be supplied in the
reverse direction with direct current only, and
when the relay H is energized in either direction,
40 its line circuit to the rear will be supplied in the
normal direction with direct current only.
Summing up for the system illustrated in Figs.
2A and 2B, it will be seen that when a section
is occupied by a train, the signal for that section
will display a stop indication comprising a single
red light; and the signals for the first, second,
and third sections in rear of such occupied sec
tion Will display, respectively, an approach indi
cation comprising a single yellow light, an ap
proach medium indication comprising two yellow
lights and a proceed indication comprising a
single green light provided that another train
is occupying the section immediately in rear of
such signals so that the associated approach
lighting relay ER is deenergized.
It will be readily apparent that the retained
neutral feature of the relays H will prevent suc
cessive tumble-down of the signal control relays
to the rear as previously explained for the relays
H shown in Figs. 1A and 1B.
Referring now to Figs. 3A and 3B, the system
illustrated herein is similar in many respects to
the systems illustrated in the previous figures.
The principal difference lies in the fact that al
ternating current is supplied to the line circuit
for the control of the second proceed indication
in rear of an occupied section whereas in the sys
tems illustrated in Fig. 1A and 1B and in Figs.
2A and 2B, alternating current is supplied to the
line circuit for the control of the first proceed
indication in rear of an occupied section.
,
Each section is provided with a signal having
an upper unit U comprising a red, a yellow,
and a green lamp and a lower unit L comprising
a red and a green lamp.
Each section is provided with a polarized direct
current signal control relay HA and with the
usual neutral direct current signal control re
lay V.
Each polarized relay HA is connected directly
to the associated line circuit and each neutral
relay V is connected to such associated line cir
cuit through a rectifier Q, a transformer M, and
a condenser D.
The high impedance of the direct current re 10
lays HA will prevent its flow of alternating cur~
rent in these relays and with the condensers D
and transformers M will prevent the iiow of di
rect current in the relays V.
Each section is provided also with the usual 15
alternator A for supplying alternating current
to the line circuit for the section next in rear.
Associated with each section is a pole-chang
ing relay designated by the reference character
HP with a prefix the same as the reference char
acter of the associated signal.
The relays HP
have a slow releasing characteristic and are
utilized to control jointly with the associated re
lays HA and V, the line circuit for the section
next in rear.
25
The relays HA and V control the associated
signals in the following manner: When both re
lays HA and V are deenergized (see signal I3)
the red lamp R. of the upper unit U of that signal
is lighted by a circuit which passes from ter
minal B through back point of Contact 8I of re
lay I 3HA, back point of contact 82 of relay I3V
and lamp R to terminal C; and the red lamp R
of the lower unit 6 of that signal is lighted by a
circuit which passes from terminal B through 35
back point of contact 83 of relay I 3V and lamp.
R to terminal C. Signal I3, therefore, is display
ing a red light above a red light to indicate
“stop”. When relay HA is energized in the re
verse direction and relay V is deenergized (see sig
nal I2) the yellow lamp Y of the upper unit U 40
of that signal is lighted by a circuit which passes
from terminal B through front point of contact
84 of relay IZHA, reverse polar contact 85-86
of relay IZHA and lamp Y to terminal C; and
the red lamp R of the lower unit L of that signal
is lighted by a circuit which passes from terminal
BA through back point of contact 8l of relay I2V
and lamp R to terminal C. Signal I2, therefore,
is displaying a yellow light above a red light to
indicate “prepare to stop at next signal”. When 50
relay HA is deenergized and relay V is energized
(see signal II) the yellow lamp Y of the upper
unit U of that signal is lighted by a circuit which
passes from terminal B through back point of
contact 88 of relay III-IA, front point of contact 55
89 of relay IIV, and lamp Y to terminal C; and
the green lampl G of the lower unit L of that
signal is lighted by a circuit which passes from
terminal B through front point of contact 90 of
relay I IV, and lamp G to terminal C‘.
Signal Il, 60
therefore, is displaying a yellow light above a
green light to indicate “approach next signal at
medium speed.”
When relay V is deenergized
and relay HA is energized in the normal direction
(see signal I Il) the green lamp G of the upper
unit U of that signal is lighted by a circuit which
passes from terminal B- through front point of
contact SI of relay IUI-IA, normal polar contact
85-92 of relay IUHA, and lamp G to terminal 70
C; and the red lampR of the lower unit U of that
signal is lighted by a circuit which passes from
terminal B through back point of contact 93 of
relay IOV, and lamp R to terminal C'. Signal
IU, therefore, is displaying a green light above 75
5
2,123,962
a red light to indicate “proceed at normal speed”.
As shown in the drawings, the section imme
diately to the right of location Z is occupied by
the train K so that both relays ISHA and I3V
are deenergized. When both relays IBI-IA and
I3V are deenergized, the relay IZHA is ener
gized by direct current in the reverse direction
over a circuit Which passes from terminal B, at
signal I3, through back point of contact 94 of
10 relay I3HA, back contact 95 of relay I3V, Wire
46, secondary winding 33 of transformer I3N,
wire 31„back point of contact 91 of relay I SHP,
front contact 98 of relay GTR, front contact S9
of relay 5TR, relay I2I-IA, front contact |00 of
relay ETR, front contact IUI of relay 6TR, and
back point of contact |02 of relay ISI-IE’ to
terminal C. When relay IZHA is energized in
the reverse direction and relay IZV is deen
ergized, alternator IZA is energized by direct cur
‘rent over a circuit which passes from termi
nal B through back contact |03 of relay I2V,
front Contact |04 of relay IZHA, reverse polar
contact IUE-|06 of relay IZHA, wire 34, and
alternator |2A to terminal C; and relay IIHA
' is energized by alternating current over a circuit
which passes from one terminal of secondary 3B
of transformer I2N through wire 3l, back point
of contact |01 of relay I2HP, front contact |08
of relay QTR, front contact I 09 of relay 3TR,
condenser IID, transformer IIM, rectifier IIQ,
relay HV, front contact IIE! of relay 3TR, front
contact III of relay ATR, back point of con
tact II2 of relay IZHP, front point of contact
||3 of relay IZHA, back contact IIA of relay
` IZV, and wire ¿33 to the other terminal of sec
ondary winding 30 of transformer |2N. When
relay IIV is energized and relay IIHA is deen
ergized, relay III-IP is energized by a circuit
which passes from terminal B through front
relay is energized and the polarized relay is de
energized, the associated signal indicates “ap
proach next signalat medium speed” and the
line circuit to the rear is supplied only with
direct current in the normal direction. When
the polarized relay is energized in the normal
direction and the neutral relay is deenergized,
the associated signal indicates “proceed at nor
mal speed” and the line circuit to the rear is>
supplied only with direct current energy in the 10
normal direction so that the signal (not shown)
controlled by that line circuit is also displaying
the normal proceed indication.
It will be noted that the pole changing relays
HP have a slow releasing characteristic.
This
feature prevents momentary opening of the line
circuit to the rear so that successive tumble
downy of the signal control relays to the rear is
avoided. For example', when the train K passes
out of the section to the right of signal I3 so> 20
that relay I IHA becomes energized in the normal
direction and relay IIV becomes deenergized to
causefsignal I I to display the normal indication,
energization of relay I IHP is> transferred from
the circuit which includes front point of contact
I I5 of relay I IV and back point of contact I|6 of
relay I IHA to a circuit which includes back point
of contact H5 of relay IIV, reverse polar con
tact I29-I25of relay III-IA, and front point of
contact IIG of relay IIHA. Relay IIHP, how 30
ever, does not open the front points of its con
tacts II'I and |22 during this transfer of control
so that energization of the line circuit for section
W-X and successive sections to the rear is not
disturbed.
Referring now to Fig. 4, which illustrates the
alternators A in detail, the reference character
|30 designates an elastic member which is caused
to vibrate between terminals |3I and |32 by a
control Winding |33. In the deenergized condi 40
tion, member |30 does not connect with either
point of contact IIE of relay IIV, back point of
contact IIB of relay III-IA and relay IIHP to
terminal C; and relay |0HA is energized by di
terminal |3| or |32 but does connect with a
rect current in the normal direction over a cir
terminal |34;
cuit Which passes from terminal B, at signal II,
through front point of contact II‘I of relay
III-IP, front contact IIB of relay ZTR, front
alternator A, winding |33 will attract member
|30 causing it to connect with terminal |32 and
contact IIO of relay ITR, relay IUHA, front
contact |20 of relay ITR, front contact I2I of
relay 21R, and front point of contact |22 of
relay III-IP to terminal C. When relay IUI-IA is
energized in the normal direction and relay |0V
is deenergized, relay IOHP is energized’ over a
circuit which passes from terminal B through
When energy is supplied to the
to move .away from terminal |34, causing wind-.
ing |33 to become deenergized. Upon the de
energization of winding |33, the resilience of
member |30 will cause it to move away from ter
minal I 32 and to connect with terminal I3| as 50
well as with terminal |34. The circuit for wind
ing |33 being then again completed through
terminal |34, winding |33 vwill again attract
back point of contact |23, normal polar' contact - member |30 causing the cycle of operation just
I 2li-|25 of relay IOHA, front point of contact described to be repeated. Winding |33 will then 55
I 20 of relay IIJHA, and relay IDHP to terminal be repeatedly energized and deenergized as long
C; and the line circuit for the section next in as energy is supplied to its control circuit.
When member |30 connects with terminal |32,
rear of section W-X is supplied With direct
current is supplied to the right-hand portion of
current energy in the normal direction over
front points of contact of relay I BHP so that the primary winding 35 of the transformer N;
the signal (not shown) controlled by that line and when member |30 ’connects with terminal
|3I, current is supplied in the opposite directio-n
circuit is also displaying its normal proceed
to the left-hand portion of primary winding 35.
indication.
In the signaling systems illustrated in Figs. Alternating current, therefore, will be induced in
r 3A; and 3B, therefore, the two signal control the secondary winding 36 of transformer N.
65
It will be readily apparent from the foregoing
relays function as follows: When both relays are
deenergized, the associated signal indicates description how the alternators A will supply
“stop” and the line circuit to the rear is sup
alternating current to the line circuit foi` the
plied only with direct current energy in the re
verse direction, When the polarized relay is
energized in the reverse direction and the neutral
section next in rear when that line circuit is
connected to wires 3l and 40 provided, of course, 70
that wire 34 is connected to terminal B and that
relay is deenergized, the associated signal indi
cates “prepare to stop at next signal” and the
yline circuit to the rear is supplied only with
winding I 33 is connected to terminal C.
- alternating'r current energy.
an upper unit UA and a lower unit LB both of 75
When the neutral
Referring now to Figs. 5A and 5B, each sec
tion is provided with a signal which comprises
6
2,123,962
which are similar in all respects to the search
light signal mechanisms UA of the signals shown
in Figs. 2A and 2B with the exception that the
lower units LB are capable of displaying a green
light or a red light but not a yellow light.
In addition to the usual source of direct cur
rent, the terminals of which are identiñed by
the reference characters B and C, each section
is provided also with a source of alternating cur
iûLP also receives energy from the line circuit
which supplies energy to the lower mechanism
venient commercial source or may be generated
LB.
with a lamp UE and each lower searchlight
mechanism is provided with a lamp LE.
Associated with each section for controlling
the associated lamps UE and LE is an approach
20 lighting relay designated by the reference char
acter ER with a preñx the same as the reference
character of the associated signal.
Each approach lighting relay ER is connected
in series with the line circuit for the section next
25 in rear and is provided with an asymmetric unit
l35 connected across its operating winding and
poled so as to force the direct current to flow
through the operating winding but to permit each
half-wave of the alternating current to by-pass
30 the operating winding. Each relay ER, there
fore, remains energized as long as the line circuit
with which it isk associated remains closed re
gardless of whether such line circuit is supplied
with direct current or with alternating current.
The lamps UE and LE are controlled by a back
contact of the associated relay ER sov that these
lamps become lighted only when such relay ER
is deenergized. For example, the lamps iBUE
and ISLE at signal I3 are both governed by back
Contact M4 of relay USER. Since relay I 3ER
40 will become deenergized so that its back contact
|44 will be closed only when section Y-Z is
occupied by a train, lamps iêìUE and I SLE will
be lighted only when section Y--~Z is occupied.
Each of the lamps UE and LE for the remain
back contacts of the associated relay LP. When
the relay LP is deenergized, that is, when the
associated line circuit is not being supplied with
alternating current energy, the upper mecha
nism is connected directly to the line circuit, 20
whereas when relay LP is energized, that is, when
the associated line circuit is supplied with alter
nating current energy, the upper mechanism is
connected to the line circuit through rectiiier Q,
25
transformer E, and condenser D.
In other words, the upper mechanism UA of
each signal is responsive to direct current only
but both mechanisms UA and LB are responsive
to alternating current. As will be explained more
in detail hereinafter, the relays LP are effective 30
also for connecting other relays to the associated
line circuit when the relays LP are energized.
Associated with each section is a pole changing
relay designated by the reference character PC
with a preñx the same as the reference char
as well as clear and stop contact I39-I4I of the
upper mechanism UA of signal I 0, or may be
energized by another circuit which includes cau
tion contact I39-I40 as well as caution and
stop contact ISS-|38 of such upper mechanism
indication position, and a contact
23e-_HH which becomes closed when the signal
is in either the clear or stop indication position.
Operably connected to each lower unit LB is a
contact |42-l133 which becomes closed only when
the signal is in the clear indication position.
Each section is provided with a line circuit
including a pair of line wires controlled by the
associated track relays and extending to the
signal for the section next in advance.
Each lower mechanism LB is connected to the
associated line circuit through a rectifier, a trans
former and a condenser designated by the refer
ence characters Q, M, and D, respectively, each
with a preñx the same as the reference char
acters of the associated signal. That is, each
mechanism LB responds only when its line circuit
is supplied with alternating current.
Associated with each section is a repeating
relay designated by the reference character LP
35
acter of the associated signal. Each relay PC
is governed by the upper signal mechanism UA
of the associated signal in such a manner that
each relay PC is energized only when the upper
mechanism UA of the associated signal is in
either its clear or caution indication position.
For example, relay IDPC may be energized by a
circuit which includes clear contact I3E-I3'I
ER in a manner similar to that just described
55 caution
76
,
Each upper mechanism UA is connected to the
associated line circuit through either iront or 15
ing signals is controlled by the associated relay
for signal I3.
Operably connected to each upper unit UA is
a Contact E3B-IST which becomes closed only
when the signal is in the clear indication posi
tion, a contact litt-|38 which becomes closed
when the signal is in either the caution or stop
indication position, a contact E39-|46 which
becomes closed only when the signal is in the
65
that when the mechanism is energized the relay
rent the terminals of which are designated by
the reference characters BX and CX. This
source of alternating current may be any con
locally at eachsignal by apparatus not shown.
Each upper searchlight mechanism is provided
15
45
with a preñx the same as the reference character
of the associated signal. Each relay LP is con
trolled by the lower mechanism LB of the asso
ciated signal and receives its energy over the
associated line circuit. That is, each LP relay
is energized only when the associated lower
mechanism is also energized. For example, the
relay IGLP is controlled over clear contact
Itî-IQS of lower mechanism LB of signal I0 so
UA. Each relay PC is effective for governing
the polarity of the direct current energy supplied 50
to the line circuit for the section next in rear.
Associated with each section is another re
peating relay designated by the reference char
acter UP with a preñx the same as the refer
ence character of the associated signal. Each
relay UP is governed by the upper signal mecha
nism UA of the associated signals. For example,
the relay IUUP is governed by clear contact
IBS-|37 of upper mechanism UA of signal Ill
so that relay IUUP is energized only when such
mechanism is in its clear indication position.
Also associated with each section is an alter
nating current power transfer relay designated
by the reference character PO with a prefix the
same as the reference character of the associated
signal. Each relay PO is governed by the asso
ciated source of alternating current and by the
associated relay UP. For example, the relay
íllPO is governed by front contact |45 of relay
IIlUP so that relay IUPO will be energized only
when relay IBUP is energized provided that the
alternating current is present at signal I0.
Each relay PO is effective to connect the line
circuit for the section next in rear with the asso
ciated source of alternating current or with the
7.5
2,123,962
associated source of direct current depending
upon whether such relay PO is energized or de
be supplied with alternatingl current energy/over.
energized, respectively.
signal I2, through front point of contact` |12 of
relay IIPO, relay IIER, front point of contact’
|13 of relay IIPC, front contact I14'of relay
ZTR, front contact |15 of relay ITR, condenser
IUD, primary winding |1| of transformer IIJM,
front contact |16 of relay ITR, front contact>
|11 of relay 2TR, front point of contact I18'of`
relay IIPC and front point of contact |19 of;
The operation of the signaling system illus
trated in Figs. 5A and 5B will probably be best
understood by tracing the circuits and explain
ing the operation simultaneously. As shown in
the drawings, a train K occupies the section im
mediately to the right of signal I 3 so that both
10 upper and lower mechanisms of that signal are
deenergized.
Signal I3, therefore, when lamps
I3UE and I3LE are lighted will display a red
light above a red light to indicate “stop”. When
signal I 3 is in this condition, relay I3PC is de
15 energized and relay I 3UP is also deenergized so
that relay I3PO likewise is deenergized.
Since both relays ISPC and I3PO are deen
ergized, operating winding 63 of upper mecha
nism UA of signal I2 is supplied with direct cur
20 rent energy in the reverse direction over a cir
cuit Which passes vfrom terminal B, at signal I3,
through back point of contact |45 of relay I3PO,
approach lighting relay I3ER, back point of con
tact I 41 of relay I3PC, front contact |48 of relay
25 GTR, front contact M9 of relay 5TR, back point
of contact |58 of relay I 2LP, operating Winding
53 of signal I2, back point of contact |5| of re
lay I's’LP, front contact |52 of relay 5TR, front
contact |53 of relay GTR, back point of contact
30 |513 of relay ISPC, and back point of contact
|55 of relay I3PO to terminal C. Signal I2,
therefore, when lamps |2UE and I 2LE are
lighted, will display a yellow light above a red
light to indicate “prepare to stop at next signal”.
35 When signal I2 is in this condition, relay |2PC is
energized by a circuit which passes from ter
minal B through back point of contact |56 of
relay IZLP, caution and stop contact I 36-I38 as
Well as caution contact ISS-I4!) of signal I2, re
lay IZPC, and back point of contact |51 of relay
l4.0 IZLP.
When relay |2PC is energized and relay I2PO
is deenergized, operating winding 63 of upper
mechanism UA of signal I I is supplied with di
rect current in the normal direction over a cir~
cuit which passes from terminal B through back
point of contacts |58 of relay |2PC, relay I2ER,
front point of contact |59 of relay |2PC, front
contact |66 of relay âTR, front contact I 6| of
relay ETR, back point of Contact |52 of relay
a circuit which passes from terminal BX, atv
relay IIPO to terminal CX.
'
When primary Winding |1| of transformer
IiìD is energized, current is induced in the sec
ondary Winding |84 of this transformer'so that
alternating current is supplied to the alternating:
current input terminals of the rectifier IUQ.
Consequently, operating winding 63 of the lower
mechanism LB of the signal I0, which mechaf
nism is connected to the direct current output
terminalr of the rectiñer I UQ, is supplied with; 20
direct current of normal polarity so that this
mechanism is caused to assume its- clear indica
tion position.
When the lower mechanism LB of signal I IJ
is in its clear indication p0sîtìon,_ relay IULP
is energized by a circuit which passes fromv one
direct current output terminal of rectifier IUQ
through clear contact |42-I43 of signal I0; and
relay LP to the other direct current output ter
minal of rectiñer I UQ.
When relay IIJLP is> energized, theoperating
winding 630i the upper mechanism UAof signal.
I0 is energized in the normal direction over a`
circuit which passes from one direct current out
put terminal of rectifier IUQ through‘front point
of contact |88 of relay IULP, o-perating'winding
63, and front point of contact I8I of relay IIlLP>
to the other output terminal of rectifier IIIQ.
Signal Ill,- therefore, when lamps IGUErand
I IILE are lighted, is in condition to display a»
.green light above a green light to indicate “pro-»
ceed at normal speed”,
When signal I0 4is in this condition, relay IDUP
is energized by a circuit which passes- from one
output terminal of rectiñer IIJQ throughfrontA
point of contact |82 of relay IDLP, cleai` con
tactv I36-I31of signal III, relay IIIUP, and front
point of contact |83 of relay IULP to; the oth-er
output terminal of rectiñer IUQ'; relay IUPC is.
energized by a circuit which passes from one
IILP, operating winding 53 of signal II, back
output terminal of rectiñer IIlQ4 through front.-
point of contact |83 of relay IILP, front contact
|84 of relay STR, front contact |65 of relay
tact ISS-|31 as. well as clear and stop contact
dTR, front point of contact |66 of relay |2PC,
and'back
point of contact |61 of relay |2PO to
55
terminal C. Signal II, therefore, when lamps
II UE and IILE are lighted, will display a green
light above a red light to indicate “approach
next signal at medium speed”. When signal II
is in this condition, relay IIUP is energized by
point of contact |82 of relay IIJLP, clear'ccn'
I39--|4I of signal Ill, relay IUPC, and'front
point of contact |83 of relay II'ILP to thefother>
output terminal of rectifier IIJQ; and‘relay IIJPO
is energized by a circuit which passes from ter
minal BX through front contact |45 of relay
IIJUP, and relay IIlPO` to terminal CX.
Since both relays IDPC and IUPO are ener
a circuit which passes from terminal B through
gized, it is readily apparent that the line` circuit>
back point of contact |58 of relay IILP, clear
contact ISE-|31 of signal II, relay IIUP, and
back point of contact |69 of relay IILPy to ter
minal C; relay IIPO is energized over front
contact |18 of relay IIUP; and relay IIPC is
for the section next in rear is supplied with
alternating current energy so that the signal
energized over a circuit Which passes from ter
minal B over the same path as just traced for
relay IIUP up to and including clear contact
~ „. I 36-I31 of signal II, and thence through clear
and stop contact ISS-MI of signal II, relay
IIPC and back point of Contact |69 of relay
IILP.
Since both relays I IPC and I IPO are energized,
«„, the primary Win-ding |1I of transformer IDM will
30 1
(not shown) controlled by that line circuit is
also in its normal proceed condition.
65
It will be noted> that both the relays PC
and UP have a slow release characteristic.
The
feature of relays UP prevents the momentary
release of the associated relaysr PO when the
control of the relays UP is being transferred'
from the back to the front points of the con
tacts of the associated relays LP, and this fea
ture of the relays PC prevents the momentary
release of the relays` PC when the control-ïforr
these relays isbeing- transferred‘from tlfie‘lcack#V
8
2,123,962
to the front points of the contacts of the asso
ciated relays LP as well as when the control for
these relays is being transferred from the cau
tion contacts to the clear contacts of the asso
ciated signal. Since the relays PC and PO do
not become released during such periods, the
energization of the line circuit for the section
next in rear is not disturbed and, consequently,
successive tumble-down of the signal control
circuits to the rear is avoided. For example,
when the train K moves out of the section to
the right of location Z so that the line circuit
for signal II is supplied with alternating cur
rent energy to cause signal II to assume the
normal proceed condition, the control circuit for
relay I IUP will be opened momentarily during
the time the control is being transferred from
the back points of contacts IBB and IBS of relay
IILP toI the front points of thes-e contacts. The
slow release characteristics of relay IIUP, how
ever, will maintain its front contact I l0 closed
during this period so that relay IIPO will not
become released. Or, for example, when the
train K vacates the section to the right of loca
tion Z so that signal I2 is caused to assume the
condition proper for displaying a green light
above a red light instead of a yellow light above
a red light, the control circuit for relay I2PC
will be opened momentarily during the time the
30 control for this relay is being transferred from
the caution contact ISS-MI) to the clear con
tact I36-I3'I of signal I2. Relay IZPC, however,
due to its slow release characteristic will main
tain its contacts in the energized condition dur
ing this period.
As hereinbefore pointed out, each section is
provided with a source of direct current and with
a Source of alternating current.
When a sec
tion is occupied by a train, the energy required
40 by the lamps for the associated signal as well
as the energy required for the line circuit for
the section next in rear will be supplied by the
source of direct current at such signal. For ex
ample, the line circuit for section Y-Z is sup
plied with energy from the source of direct cur
rent at signal I3 and the lamps I3UE and I3LE
would be also supplied with energy from this
source of direct current if relay ISER should
become deenergized by another train occupying
section Y-Z. The circuit for lamps ISUE and
I3LE may be traced from terminal B through
back point of contact |46 of relay I SPO, back
contact IM of relay I 3ER, lamps I3UE and ISLE
in multiple, and back point of contact |55 of
relay I3PO to terminal C.
At signal I2, the energy required by relay IZPC
and the energy required by the line circuit f_.or
section X~Y as well as the energy which may
be required to light the lamps IZUE and IQLE
GO is all supplied by the source of direct current at
that signal.
At signal II, the energy required by relays
IIPC and IIUP is supplied by the source of di
rect current at that signal but the energy re
quired by the line circuit for the section W-X
and the energy required by relay I IPO as well as
the energy which may be required for the lamps
IIUE an-d IILE is supplied by the source or"
70 alternating current at that signal.
At signal IU, the energy required for the relays
IULP, IOPC, IGPO, and IUUP and the energy re
quired for the line circuit for the section next
in rear as well as the energy which may be re
75 quired by the lamps IUUE and IDLE is supplied
entirely by the source of alternating current at
that signal.
In the event of failure of the source of alter
nating current, my system will function as a
two indication signaling system.
For example, 5
if the alternating current at signal II should
become absent, the relay IIPO would become
deenergized so that the back points of its con
tacts |12 and IIS would become closed to sup
ply direct current energy in the normal direction 10
to the line circuit for the control of signal IIJ
with the result that signal I0 would assume the
condition proper for displaying a green light
above a red light instead of the normal proceed
indication.
To sum up regarding the two sources of cur
rent, each signal is provided with an alternat
ing current source of energy which supplies the
entire load required by my system as long as
the signals display their normal proceed indi
cation, and each'signal is supplied with a direct
current source of energy which supplies either
a portion or all of the energy required when such
signals are displaying one or the other of the
more restrictive indications and which source ‘
of direct current energy serves also as a reserve
source of current in event of failure of the source
of alternating current.
It will be apparent that since the stretch of
railway track ordinarily will be unoccupied for 30
the greater portion of the time, the consumption
of direct current energy will be relatively small.
This feature provides for a material reduction
in the cost of maintenance particularly when the
direct current energy is supplied by primary
batteries.
From the foregoing description, it is apparent
that each of the modiiications embodying my in
vention provides a distinctive control for each
of three sections in the rear of an occupied sec
40
tion whereby a three block, four indication sys
tem of signaling is produced which systems each
require but two line control wires extending from
signal to signal.
Although I have herein shown and described
only four forms of apparatus embodying my in
vention, it is understood that various changes and
modifications may be made therein within the
scope of the appended claims without departing
from the spirit and scope of my invention.
Having thus described my invention, what I
claim is:
1. I_n combination, a plurality of successive sec
tions of railway track each having a track cir
cuit including a track relay, a line circuit for each
section governed by the associated track relay,
a polarized direct current relay and an alternat~
ing current relay for each section connected to
the associated line circuit, a source of direct cur
rent for each section, an alternator for each sec
60
tion for converting direct current to alternating
current, means including back contacts of both
said direct current and said alternating current
relay for connecting the associated alternator to
the associated direct current source and to the 65
line circuit next in rear of the associated sec
tion, means including front contacts of the alter
nating current relay and back contacts of the
direct current relay for supplying such rear line
circuit with direct current only of reverse po 70
larity, means including front contacts of said
direct current relay for supplying such rear line
circuit with direct current only of normal polarity
and a signal for each section governed by said
two associated relays.
75
2,123,962
2. A railway signal system comprising a iîrst
9
the adjacent block section to the rear, each sig
and a second as well as a third track section over
nal also having associated therewith a source
which traiiic normally progresses in the order
named, a track circuit including a track relay
for each section, a line- circuit for each section
of direct current, said iirst control device being
operative when energized to condition the signal
with which it is associated to display a restrictive
proceed indication, the second control device be
ing operative when energized while the ñrst con
trol device is deenergized to condition said signal
governed by the associated track relay and
including a pair of line wires, a polarized direct
current line relay for each section connected to
the associated line circuit, an auxiliary line relay
for each section also receiving energy from the
associated line circuit and responsive only when
said line circuit is supplied with alternating cur
rent, means including back contacts of both
line relays for the third section for supplying
alternating current to the line circuit for the sec
ond section when the third section is occupied,
means including front contacts of the auxiliary
relay for the second section and back contacts
of the polarized relay for that section for sup
plying the line circuit for the first section with
direct current of reverse polarity, a signal for said
first section, and means including reverse polar
contacts of the polarized relay for the ñrst sec
tion for causing said signal to indicate that the
25. third section is occupied.
3. In combination, a stretch of railway track
divided into a plurality of successive block sec
tions each having a pair of conductors governed
by traiiic conditions in said section, each of said
30 block sections having a signal capable of display
ing a normal proceed indication and a plurality
of restrictive proceed indications, each of said
to display its normal proceed indication, the first
and second control devices jointly controlling the l0
supply of direct current to the associated alter
nating current supply mechanism, one of said
control devices controlling the connection of the
source of direct current to the conductors of the
15
adjacent block section to the rear.
5. In combination, a stretch of railway track
divided into a plurality of successive block sec
tions each having a pair of conductors governed
by traiîic conditions in said section, each of said
block sections having a signal capable of display .20
ing a normal proceed indication and a plurality
of restrictive proceed indications, each of said
signals having associated therewith first and sec
ond control devices energized from the conductors
for the section with which the signal is associated, 25
the ñrst control device being responsive to alter
nating current supplied to said conductors, the
second control device being responsive to direct
current supplied to said conductors, each signal
having associated therewith an alternating cur
rent supply mechanism operative on the supply
of direct current thereto to supply alternating
current to a circuit from which alternating cur
signals having associated therewith iirst and sec
ond control devices energized from the conductors
35 for the section with which the signal is associated,
rent may be supplied to the conductors of the
adjacent block section to the rear, each signal
the first control device being responsive to alter
nating current supplied to said conductors, the
second control device being responsive to direct
current supplied to said conductors, each signal
rect current, said first control device being oper
ative when energized to condition the signal with
40 having associated therewith an alternating cur
rent supply mechanism operative on the supply
of direct current thereto to supply alternating
current to a circuit from which alternating cur
rent may be supplied to the conductors of the
adjacent block section to the rear, each signal
also having associated therewith a source of di
rect current, said first control device being oper
ative when energized to condition the signal with
which it is associated to display a restrictive
50 proceed indication, the second control device be
ing operative when energized while the first con
trol device is deenergized to Condition said signal
to display its normal proceed indication, the sec
ond device controlling the supply of direct cur
rent to the associated alternating current supply
mechanism.
4. In combination, a stretch of railway track
divided into a plurality of successive block sec
tions each having a pair of conductors governed
60 by traii‘ic conditions in said section, each of said
block sections having a signal Capable of display
ing a normal proceed indication and a plurality
of restrictive proceed indications, each of said
signals having associated therewith ñrst and sec
ond control devices energized from the conduc
tors for the section with which the signal is as
sociated, the ñrst control device being responsive
to alternating current supplied to said conductors,
the second control device being responsive to di
70 rect current supplied to said conductors, each
signal having associated therewith an alternat
ing current supply mechanism operative on the
supply of direct current thereto to supply alter
nating current to a circuit from which alternat
75 ing current may be supplied to the conductors of
30
also having associated therewith a source of di
which it is associated to display a restrictive pro
ceed indication, the second control device being
Operative when energized while the ñrst control
device is deenergized to condition said signal to
-display its normal proceed indication, said first
and second control devices jointly controlling
the supply of direct current to the associated al
ternating current supply mechanism, said first
control device also controlling the connection of
the source of direct current to the conductors of
the adjacent block section to the rear.
6. In combination, a stretch of railway track 50
divided into a plurality of successive block sec
tions each having a pair of conductors governed
by traiìc conditions in said section, each of said
block sections having a signal capable of dis
playing a normal proceed indication and a plu 55
rality of restrictive proceed indications, each of
said signals having associated therewith first and
second control devices energized from the con
ductors for the section with which the signal is
associated, the first control device being respon 60
sive to alternating current supplied to said con
ductors, the second control device being respon
sive to direct current supplied to said conductors,
each signal having associated therewith an alter
nating current supply mechanism operative on 65
the supply of direct current thereto to supply
alternating currentvto a circuit from which alter
nating current may be supplied to the conductors '
of the adjacent block section to the rear, each
signal also having associated therewith a source 70
of direct current, said first control device being
operative when energized to condition the signal
with which it is associated to display a restrictive
proceed indication, the second control device be
ing operative when energized while the ñrst con
1O
2,123,962
trol device is deenergized to condition said sig
nal to display its normal proceed indication, said
ñrst and second control devices jointly control
ling the supply of direct current to the associated
alternating current supply mechanism and the
nating current supply mechanism, said ñrst con
trol device controlling the connection of the
source of direct current to the conductors of the
adjacent block section to the rear.
9. In combination, a stretch of railway track
connection of the source of direct current to the
divided into a plurality of block sections each hav
conductors of the adjacent block section to the
ing a pair of conductors governed by traffic condi
tions in said section, each of said block sections
having a signal capable of displaying a normal
proceed indication and a plurality of restrictive
proceed indications, each of said signals having
rear.
'7. In combination, a stretch of railway track
divided into a plurality of successive block sec
tions each having a pair of conductors governed
by traffic conditions in said section, each of said
block sections having a signal capable of dis
playing a normal proceed indication and a plu
15 rality of restrictive proceed indications, each of
said signals having associated therewith first and
second control devices energized from the con
ductors for the section with which the signal is
associated, the first control device being respon
20 sive to alternating current supplied to said con
ductors, the second control device being respon
sive to direct current supplied to said conductors,
each signal having associated therewith an al
ternating current supply mechanism operative
25 on the supply of direct current thereto to supply
alternating current to a circuit from which alter
nating current may be supplied to the conductors
of the adjacent block section to the rear, each
signal also having associated therewith a source
30 of direct current, said iirst control device being
operative when energized to condition the signal
with which it is associated to display a restrictive
proceed indication, the second control device be
ing operative when energized while the ñrst con
35 trol device is deenergized to condition said signal
to display its normal proceed indication, said
second control device controlling the supply of
direct current to the associated alternating cur
rent supply mechanism, said iirst and second con
40 trol devices jointly controlling the connection
of the source of direct current to the conductors
of the adjacent block section to the rear.
8. In combination, a stretch of railway track
divided into a plurality of block sections each
45 having a pair of conductors governed by traffic
conditions in said section, each of said block sec
tions having a signal capable of displaying a nor
mal proceed indication and a plurality of re
strictive proceed indications, each of said signals
50 having associated therewith a first and a second
control device energized from the conductors for
the block section with which the said signal is
associated, the first control device being respon
sive to alternating current supplied to said con
55 ductors, the second control device being respon
sive to direct current supplied to said conductors,
said second control device being selectively re
sponsive to the polarity of direct current supplied
thereto, each of said signals having associated
60 therewith an alternating current supply mecha
nism operative on the supply of direct current
thereto to supply alternating current toa circuit
from which alternating current may be supplied
to the conductors of the adjacent block section
65 in the rear, each of said signals also having as
sociated therewith a source of direct current, the
first control device being operative when ener
gized to condition the signal to display a restric
tive proceed indication, the second control device
70 being operative when energized with direct cur
rent of a particular polarity at a time when the
iirst control device is deenergized to condition
the signal to display the normal proceed indica
tion, the second control device controlling ythe
75 supply of direct current to the associated alter
associated therewith a ñrst and a second control
device energized from the conductors for the block
section with which the saidv signal is associated,
the first control device being responsive to alter 15
nating current supplied to said conductors, the
second control device being responsive to direct
current supplied to said conductors, said second
control device being selectively responsive to the
polarity of direct current supplied thereto, each 20
of said signals having associated therewith an al
ternating current supply mechanism operative on
the supply of direct current thereto to supply al
ternating current to a circuit from which alternat
ing current may be supplied to the conductors of 25
the adjacent block section in the rear, each of
said signals also having associated therewith a
source of direct current, the ñrst control device
being operative when energized to condition the
signal to display a restrictive proceed indication, 30
the second control device being operative when
energized with direct current of a particular po
larity at a time when the iirst control device is
deenergized to condition the signal to display the
normal proceed indication, said ñrst and second 35
control devices jointly controlling the supply of
direct current to the associated alternating cur
rent supply mechanism, said first control device
controlling the connection of the source of direct
current to the conductors of the adjacent block 40
section to the rear.
10. In combination, a stretch of railway track
divided into a plurality of block sections each hav
ing a pair of conductors governed by traiiic con
ditions in said section, each of said block sections 45
having a signal capable of displaying a normal
proceed indication and a plurality of restrictive
proceed indications, each of said signals having
associated therewith a i'lrst and a second control
device energized from the conductors for the 50
block section with which the said signal is asso
ciated, the first control device being responsive to
alternating current supplied to said conductors,
the second control device being responsive to
direct current supplied to said conductors, said
second control device being selectively responsive
to the polarity of direct current supplied thereto,
each of said signals having associated therewith
an alternating current supply mechanism opera
tive on the supply of direct current thereto to sup 60
ply alternating current to a circuit from which
alternating current may be supplied to the con
ductors of the adjacent block section in the rear,
each of said signals also having associated there
with a source of direct current, the first control
device being operative when energized to condi
tion the signal to display a restrictive proceed in
dication, the second control device being operative
when energized with direct current of a particular
polarity at a time when the first control device ls 70
deenergized to condition the signal to display the
normal proceed indication, said ñrst and second
control devices jointly controlling the supply of
direct current to the associated alternating cur
rent supply mechanism, said second control de
75
2,123,962
vice controlling the connection of the source of
direct current to the conductors of the adjacent
block section to the rear.
ll. In combination, a stretch of railway track
Ul divided into a plurality of block sections each hav
ing a pair of conductors governed by trafhc con
ditions in said section, each of said block sections
having a signal capable of displaying a normal
proceed indication and a plurality of restrictive
1.1
the source of direct current to the' conductors of
the adjacent block section to the rear.
13. In combination, a stretch of railway track
divided into a plurality of block sections each hav
ing a pair of conductors governed by trafñc con
ditions in said section, each of said block sections
having a signal capable of displaying a normal
proceed indication and a plurality of restrictive
proceed indications, each of said signals having
lO proceed indications, each of said signals having
associated therewith a first and a second control
associated therewith a iirst and a second control
device energized from the conductors for the block
device energized from the conductors for the
block section with which the said signal is associ
section with which the said signal is associated,
the iirst control device being responsive to al
ated, the iirst control device being responsive to
ternating current supplied to said conductors, the
second control device being responsive to direct 15
15 alternating current supplied to said conductors,
the second control device being responsive to di
rect current supplied to said conductors, said sec
ond control device being selectively responsive
to the polarity of direct current supplied thereto,
20 each of said signals having associated therewith
an alternating current supply mechanism opera
tive on the supply of direct current thereto to
supply alternating current to a circuit from which
alternating current may be supplied to the con
25 ductors of the adjacent block section in the rear,
each of said signals also having associated there
with a source of direct current, the iirst control
device being operative when energized to condi
tion the signal to display a restrictive proceed in
30 dication, the second control device being operative
when energized with direct current of a par
ticular polarity at a time when the iirst control
device is deenergized to condition the signal to
display the normal proceed indication, said ñrst
C13
and second control devices jointly controlling the
supply oi direct current to the associated. alter
nating current supply mechanism, and also joint
ly controlling the connection of the source of di
rect current to the conductors of the adjacent
4.0 block section to the rear.
l2. In combination, a stretch of railway track
divided into a plurality of block sections each
having a pair of conductors- governed by trañic
conditions in said section, each of said block sec
tions having a signal capable of displaying a nor
mal proceed indication and a plurality of restric
tive proceed indications, each of said signals hav
ing associated therewith a iirst and a second con
trol device energized from the conductors for the
50 block section with which the said signal is as
sociated, the iirst control device being responsive
to alternating current supplied to said conduc
tors, the second control device being responsive to
direct current supplied to said conductors, said
55 second control device being selectively respon
sive to the polarity of direct current supplied
thereto, each of said signals having associated
therewith an alternating current supply mech
anism operative on the supply of direct current
60 thereto to supply alternating Ícurrent to a circuit
from which alternating current may be supplied
to the conductors of the adjacent block section in
the rear, each of said signals also having associ
ated therewith a source of direct current, the iirst
current supplied to said conductors, said second
control device being selectively responsive to the
polarity of direct current supplied thereto, each
of said signals having associated therewith an al
ternating current supply mechanism operative on
the supply of direct current thereto to supply al
ternating current to a circuit from which alter
nating current may be supplied to the conductors
of the adjacent block section in the rear, each of
said signals also having associated therewith a 25
source of direct current, the iirst control device
being operative when energized to condition the
signal to display a restrictive proceed indication,
the second control device being operative when
energized with direct current of a particular po 30
larity at a time when the iirst control device is
deenergized to condition the signal to display the
normal proceed indication, said second control
device controlling the supply of direct current to
the associated alternating current supply mech 35
anism, said second control device being operative
when energized with direct current of said par
ticular polarity to interrupt the supply of direct
current to said mechanism.
14. In combination, a stretch of railway track 40
divided into a plurality of block sections each hav
ing a pair of conductors governed by traiiic con
ditions in said section, each of said block sections
having a signal capable of displaying a normal
proceed indication and a plurality of restrictive 45
proceed indications, each of said signals having
associated therewith a first and a second control
device energized from the conductors for the
block section with which the said signal is as
sociated, the iirst control device being responsive 50
to alternating current supplied to said conductors,
the second control device being responsive to di
rect current supplied to said conductors, said sec
ond control device being selectively responsive to
the polarity of direct current supplied thereto, 55
each of said signals having associated therewith
an alternating current supply mechanism opera
tive on the supply of direct current thereto to sup
ply alternating current to a circuit from which
alternating current may be supplied to the con 60
ductors of the adjacent block section in the rear,
each of said signals also having associated there
with a source of direct current, the first control
device being operative when energized to condi
control device being operative when energized to
condition the signal to display_a restrictive pro
tion the signal to display a restrictive proceed in
dication, the second control device being opera
ceed indication, the second control device being
operative when energized with direct current of
tive when energized with direct current of a par
ticular polarity at a time when the iirst control
device is deenergized to condition the signal to
display the normal proceed indication, said sec 70
ond control device controlling the supply of di
rect current to the associated alternating current
a particular polarity at a time when the first con
70 trol device is deenergized to condition the signal
to display the normal proceed indication, said
second control device controlling the supply of
direct current to the associated alternating cur
rent supply mechanism, said ñrst and second con
75 trol devices jointly controlling the connection of
65
supply mechanism, said second control device be
ing operative when energized with direct current
of said particular polarity to interrupt the supply 75
12
2,123,962
of direct current to vsaid mechanism, said i'lrst rent thereto to supply alternating current to a
control device controlling the connection of the p circuit from which alternating current may be
source of direct current to the conductors of the supplied to the conductors of the adjacent block
section in the rear, each of said signals also having
adjacent block section to the rear.
Ul
15. In combination, a stretch of railway track associated therewith a source of direct current,
divided into a plurality of block sections each hav- the. first control device being operative when en
ergized to condition the signal to display a restric
ing a pair of conductors governed by trai-lic con
tive proceed indication, the second control device
ditions in said section, each of said block sec
tions having a signal capable of displaying a being operative when energized with direct cur
10 normal proceed indication and a plurality of re
rent of a particular polarity at a time when the 10
ñrst control device is deenergized to condition the
strictive proceed indications, each of said sig
signal to display the normal proceed indication,
nals having associated therewith a ñrst and a
said second control device controlling the supply
second control device energized from the conduc
of direct current to the associated alternating cur
tors for the block section with which the said sig
nal is associated, the ñrst control device being rent supply mechanism, said second control de 15
responsive to alternating current supplied to said vice being operative when energized with direct
current of said particular polarity to interrupt
conductors, the second control device being re
the supply of direct current to said mechanism,
sponsive to direct current supplied to said conduc
tors, said second control device being selectively said first and second control devices jointly con
trolling the connection of the source of direct
responsive to the polarity of direct current sup
current to the conductors of the adjacent block
plied thereto, each of said signals having as
sociated therewith an alternating current supply section to the rear.
GEORGE R. PFLASTERER.
mechanism operative on the supply of direct cur
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