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Jan. 7, 1947.
T. R. WHITE
2,414,079
RAILROAD TRACK SWITCH POSITION INDICATOR SYS TEM AND’ CAR ACTUATED
>
-
CIRCUIT
CONTROLLER THEREFOR
Filed Aug. 18, ‘1944
2 Sheets-Sheet 1
INVENTOR.
- THEM/ff ?. Wf/l/"f
' Jan. 7, 1947.‘
T_ R wH|TE
2,414,079
RAILROAD TRACK SWITCH POSITION INDICATOR SYSTEM AND CAR ACTUATED
'
CIRCUIT
CONTROLLER THEREFOR
Filed Aug. 18, 1944
'
2 Sheets-Sheet 2
77/f000/FE R. W/f/TE
BY
ATTURNEY
2,414,079
Patented Jan. 7, 1947
UNITED STATES PATENT OFFICE
2,414,079
RAILROAD TRACK SWITCH POSITION INDI
CATOR SYSTEM AND CAR ACTUATED CIR
CUIT CONTROLLER THEREFOR
Theodore R. White, Brooklyn, N. Y.
Application August 18, 1944, Serial No. 549,991
3 Claims. (Cl. 246-219)
2
The present invention relates to signal sys
tems for use on railroad lines to warn the en
gineers or motormen of oncoming trains of dan
gerous conditions on the tracks ahead of them.
More particularly it relates to a signal system in
connection with a switch operating to open a
siding from the main track wherey the engineer
of the oncoming train is warned su?iciently in
advance by a system of signal lights that the_
switch is open.
It is frequently the case that when a switch
is thrown so as to open a siding from the main
up into such a position that it will contact the
wheels of any car passing over the rail.
Simul
taneously, signal lights also included in the cir
cuit show at a plurality of positions between
the magnetic coils and the siding. So long as no
train is in the block between the magnetic coils
and the siding, the lights burn continuously.
But when a train of cars passes over the magnetic
coils, the switch having been thrown and the
coils energized, the wheels of the cars strike the
raised arm, driving it and its coil forward to a
distance su?icient to break the circuit. However,
line, even though a warning signal is displayed,
as each wheel passes the arm, the latter immedi
it is either so indistinct or so close to the open
ately is raised to meet the next wheel by the pull
switch that the engineer of the oncoming train 15 of the energized coils. There is, thus, a con
tinual, rapid making and breaking of the circuit
is unable to observe it in time to stop his train
and a resulting rapid flashing on and off of the
before running into the open siding. In this
signal lights ahead of the engine, giving warn
manner accidents are caused with great fre
ing to the engineer to bring his train to a stop.
quency and with considerable loss of life and
The invention will be more clearly understood
property.
from the drawings in which Fig. 1 represents di
It is an object of the present invention to
agrammatically a section of track including a
provide a system which will show warning sig
main line and a siding with appropriate switch
nals at various distances in advance of the open
ing means and the signal circuit of the inven
switch, and if the engineer runs past the ?rst of
the warning lights, the next succeeding light at 25 tion; Fig. 2 illustrates diagrammatically a switch
box in connection with the rod of the rail switch
a considerable distance from the open switch will
at the siding shown at 4 in Fig. 1; Fig. 3 shows a
be caused to ?ash on and off rapidly by contact
side elevation of the magnetic coil system indi
arms disposed at the side of the rail. A light
cated at 1 in Fig. 1; Fig. 4 is an end View in ele
showing a constant lbeam may often be unob
vation of the magnetic coil system of Fig. 3 taken
served by the engineer, whereas a light rapidly
on the line 4-—4; and Fig. 5 is a circuit diagram
?ashing on and off will more surely attract his
of the signal system of the invention.
attention and warn him to throttle down and
Referring to Fig. 1, a main line of tracks l is
stop his train.
represented in which a switch 2 opens or closes
Brie?y described, the invention includes an
a siding 3 o? the main line I. The switch 2 also
electric switch box comprising a ?xed and a
operates a main signal circuit which extends from
movable contact device in alignment with each
one side of the source of current through the
other. Assuming the rail switch to be an ordi
nary hand switch, the contact devices may con
sist of two contact points, one fixed on the rod of
switch box 4, conductor 5, continuously burning
red signal light 6, magnetic coils of switch means
the rail switch and moving therewith, and the 40 ‘I and conductor 8 which leads back to the source
of electric current. Another and secondary cir
other being mounted ?xedly on the inside of the
cuit extends from conductor 5 through signal
electric switch box. Thus, when the rail switch
lights l2 and I3 in parallel, conductor l0, con
is thrown so as to give free passage on the main
tact points of switch means 1 and conductor 8
line, the two contact points are separated and
back to the source of electric current.
no current passes through the circuit. When,
As will be seen from Fig. 2, the switch box 4
however, the rail switch is thrown so as to open
encloses a spring contact arm M on which is
the siding, the switch rod carries the movable
mounted a contact point 15. The contact arm
contact point into contact with the ?xed con
I4 is ?xedly mounted on the switch rod It and
tact point and closes the circuit. Included in the
moves with it when the switch is thrown. An
circuit, at a predetermined position in advance
other contact point I‘! is mounted on the inside
of the switch, magnetic coils are set beside the
of the housing of the switch box 4. Thus, when
rail. On throwing the switch to open the siding
the switch is thrown so as to open the siding 3,
and thus closing the electric circuit, the magnetic
the contact point I5 is brought into contact with
coils at the advanced position become energized
the contact point I‘! and the circuit is closed.
and an arm attached to one of the coils is thrown
3
2,414,079
The switch means ‘I is diagrammatically shown
in Figs. 3 and 4. It comprises the magnetic coils
i 8 and I9 which are oppositely wound. Coil I8
is ?xed to the housing 20 of the system, while
coil 19 is slidably connected with the link 2|
pivoted at 24 on rocker arm 28 and the helical
spring 22. The breaker arm 9 turns on the shaft
23 which also carries rocker arm 28, the breaker
arm 9 and rocker arm '29 turning with the shaft
23. It will, therefore, be evident that when the
main track I is open and the siding 3 isclosed,
the coils l8 and [9 are de-energized and the
helical spring 22 pulls coil l9 apart from coil l8,
thus breaking the secondary circuit. ‘By this
same pull of spring 22 the breaker arm 9 is low
ered below the level of the rail 25.. When, how
ever, the switch 2 is thrown so as to open the sid-_
4
tioned signal lights to burn intermittently when
a train enters a section of track controlled by
said circuits; said means comprising a pair of
cooperating contact points in said secondary cir
cuit, a breaker arm, means normally maintain
ing said contact points open and said breaker
arm out of the path of wheels of said train, and
magnetic ‘coils adapted and arranged to close
said contact points and ‘move said breaker arm
into the path of wheels of said train when said
main circuit is closed whereby said breaker arm
will open said secondary circuit when contacted
by a, wheel of said train.
2. ‘In an electric railroad signalling'system, the
combination with a rail switch of a main electric
circuit that includes an electric switch that is
opened by closing said rail switch and closed by
ing 3 and to close the electric circuit through the
opening said rail switch, and a signal light that
contact points 15 and I7 in the switch box 4, the
burns continuously when said main circuit is
coils l8 and i9 are energized. Coil I9 is pulled 20 closed, and magnetic coils of switch means; a
into contact with coil 18 and breaker arm 9 is
secondary circuit including a plurality of signal
raised so as to be contacted ‘by the wheels ‘of any
lights spaced‘at intervals along a section of track
engine or car passing over s-rail 25. Simultane
controlled ‘by said circuits, and means to cause
ously, a pair of contact points, one of which 26
said lights to burn intermittently when a train
is ?xed and the other 27 is carried by the rocker 25 enters said track section; said means comprising
arm 28, are brought into contact with each other
a pair .of cooperating contact points in said sec
by the raising of the rocker arm 28.and the in
ondary circuit, associated with said magnetic
termittent signal lights I2 and ‘.13 are thus lighted
coils
said main. circuit, .a breaker arm nor
and continue to burn so ‘long as points 26 and 21
mally maintained
a position out of the path
remain in contact.
30 of wheels of said train but adapted and ar
Where, however, a train passes over rail 25,
ranged ito mcve into the path of wheels of said
each wheel in passing strikes breaker arm 9 and
train :and to close said secondary circuit when
forces it downward, turning shaft 23 which car
said magnetic coils are energized by the closing
ries with it rocker arm 28, thus forcing coils l8
of said main circuit vwhereby said breaker arm
and t9 apart and moving contact points 26 and 35 will open said secondary circuit under impact
27 out of contact. The secondary circuit being
of a train wheel and ‘be drawn into closed posi
thus broken, the lights I2 and [3 go out. They
tion again when said train wheel has passed.
immediately relight, however, when the car wheel
3. In association with the tracks of a railroad,
has passed and remain alight until the next wheel
an electric railroad signalling system comprising
strikes breaker arm 9. The effect is to cause 40 a main electric circuit including signal lights
lights l2 and 13 to blink as long as the train
adapted and. arranged .to .burn continuously, and
continues to pass over ‘breaker arm 9 into the
a secondary electric circuit including signal lights
danger zone.
adapted and arranged to burn intermittently;
As will be seen from the circuit diagram Fig. 5,
magnetic coils insaid main circuit and cooperat
the intermittent lights l'2'and l3 are connected in
ing contact points in said secondary circuit as
multiple series in the subordinate or secondary
sociated with said magnetic coils;~ a breaker arm
circuit that is closed by the raising of the breaker
adapted andarranged normally to maintain said
arm 9 and rocker ‘arm 28 which brings the con
tact points 25 and 21 ‘into contact when the coils
i8 and it are energized.
-
Having thus described my invention, what I
claim is:
1. 'In an electric signalling system, vthe ‘con bination with ‘a rail switch of a main electric
circuit including signal ‘lights adapted and ar~
ranged to burn continuously when said circuit
is closed and -a secondary circuit including sig
nal lights and means to cause said last men"
contact points open and to assume a position
out of the ‘path of wheels of a train passing on
saidrrailroad track :and to move into the path of
Itrain wheels and close said contacts when
said magnetic coils are energized by the closing
of the main circuit, whereby said breaker arm
will open- said secondary circuit and cause said
lights in that circuit to burn intermittently when
said arm ‘is impacted by said train wheel.
THEODORE R. WHITE.
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