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Патент USA US2131818

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ct. 4, 1938.
Filed Feb. 19, 1936
2 Sheets-Sheet 1 -
J’Z 67%
BY myammlé
Oct. 4, 1938.
' s. c. ROTH
Filed Feb. 19, 19:56‘
2 Spe‘ets-Sheet 2 '
Patented Dot. 4-, 1938
‘Samuel C. Roth, Allentown, Pa., assignor to Au
tomatic Signal Corporation, East Norwalk,
Conn” a corporation of Delaware ‘
‘ Application February 19, 1936, Serial No. 64,771‘
1 Claim. 1 (01. 177-337)
This invention relates to electrically operated
traffic sgnal lights and has for an object to pro
' vide an automatic signal- device of the stop and go,
or stop, caution, and go type ‘capable of adjusting
55 itself to varying vconditions of tra?ic at all timesa
A further object is to provide a device of this
character adapted" to be installed at intersections
where traf?c is unequally divided and provide
positive safety to vehicles desiring to cross the
10' 1
main highway.
A further object is top-rovide a device of, this
character which willv so control traffic that the
traffic on the main highway will have uninter
rupted right of way as long as no vehicles appear
certain camsfon the program control rotor close
associated switch contacts.
Figure 5 is a ‘diagrammatic view showing how
another cam on the program control rotor closes
associated switch contacts.
Figure 6 is a diagrammatic view showing sug
gested arrangement of the ‘signal apparatus" at
an intersection of a main highway and a cross
Referring now to the drawings in which like 10
characters of reference designate similar parts
A further object is to provide magnetically op
erated switches, responsive to cams, or contacts
in the various views, 8 designates a trai?c signal
of the type adapted to indicate a go or green
signal ‘9 on the main highway simultaneously with
a stop or red signal It) on the intersecting‘ cross 115
road and vice versa. Vehicle operated switches
H are disposed. on the cross ‘road in the path of
on the program control rotor, and a switch op
vehicles approaching the intersection'from either
1, ' on the cross road to» contestright of way.
erated by Vehicles on the cross road, to‘operate
a" the trai?c signal ‘on the main highway as an
ordinary stop and go signal light as long as there
are vehicles on the cross road to cross the inter
section, and to maintain the tra?ic signal con
tinuous as a go signal for traf?c on the main
25 highway when no vehicles are on the cross road,
thus preventing the unnecessary interruption of
the main highway traffic by a stop signal when no
traf?c appears on the cross intersection.
With the above and other objects in View the
30 invention consists of certain novel details of con
struction and combinations of parts hereinafter
fully described and claimed, it being understood
direction and, these switches are shown as the type
adapted to be closed by contact with a vehicle 20
passing thereover although any preferred type of
vehicle operated switch may be employed.
Assembled with the tra?ic signal 8 are a pair
of opposed electro-magnets l2 and Hi and be
tween the poles of the magnets there is mounted 25
an armature M which is magnetically attracted
by one or the other of the magnets to open and
close a switch l5 which controls the motor- circuit
of the tra?ic signal. The switch l5 may be a
single throw switch of the snap type adapted to be 30 .
yieldably held at either limit of its movement,
at one limit of its movement engaging a switch
that various-modi?cations may be resorted to
contact [6 in the motor circuit, shown best in
within thel'scope of the appended claim without
35 departing from the spirit or sacri?cing any of the
advantages of the invention.
In the accompanying drawings forming part of
this speci?cation,
Figure 1 is a diagrammatic view of tra?ic signal
40 apparatus constructed in accordance with the in
vention and showing ‘the motor circuit open to
When the vehicle operated switch H is closed 35
by a vehicle passing thereov-er when approaching
the intersection, a circuit H is closed through the
magnet 53 which is thus energized to attract the
armature l4 and close the switch It in the circuit
position thus to operate the device as a continuous
E8 of the traffic signal motor IS. The‘motor ro- .40
tates the program rotor 20 through a worm 2i and
‘worm gear 22 to set in motion the program con
trol cams 23.
The program control cams operate in the usual
manner to close switch contacts 24 in the signal 45
light circuits in sequence to ?rst change the signal
to caution or amber for the main highway. Then
stop and g0 signal of the conventional type.
Figure 3 is a view similar to Figure 2 but'show
50 ing the upper switch of the pair of magnetically
go or green for the cross road and simultaneously
to stop or red for the main highway. After an- 50
maintain the green or go light continuously on'
the main highway.
Figure 2 is a view similar to Figure 1 but show
45 ing the motor circuit closed to turn the rotor and
the upper magnetically operated switch in open
operated switches in closed position to ' permit
stopping of the program control rotor by cam 25
when one revolution of the rotor has been com
Figure 4 is a diagrammatic view showing how
after an'interval the signal will be changedto
other interval the signal will change to caution for
the crossvroad and thereafter to stop- or red for
the-cross road and simultaneously to go or green
for the mainrhighway.
The latter or go signal for the main highway 55
will remain continuous as long as no other ve
hicles appear on the cross road at the intersection
and this is accomplished'by stopping the rotor at
the end of one revolution by means of a cam 25
on the program control rotor. The cam is dis
the intersection under the protection of the green
or go, light of the cross road.
When the cam 35 subsequently closes the con
tacts 34 the magnet 29 will be energized to close
the switch 3| which controls the circuit 21 so that 5
in the event of no more tra?ic appearing on the
posed to affect contact 26 preferably at the end
of the predetermined go period for the main high
cross road, when the cam 25 next moves around
way and closes switch contacts 26 in a circuit 21
into circuit closing position to close the circuit
which energizes the electro-magnet I2. When
10 the magnet is energized it attracts the armature
I4 to open the switch I5 which breaks the motor
circuit, as shown in Figure 1. Thus the rotor will
stop at a point which will give a cross lane ve
hicle a favorable light without delay.
It is essential that means be provided whereby
a late arriving vehicle on the cross road will not
be trapped at the intersection if the signal is
about to change against it.‘ For this purpose a
pair of opposed electro-magnets 28 and 29 are
assembled with the traf?c- signal and between
the poles of the magnets there is mounted an
armature 30 which is magnetically attracted by
one or the other of the magnets to open or close
a switch 3! in the circuit 27. The magnet 28
25 is connected in series with the vehicle operated
switch II and in parallel with the motor circuit
closing magnet I3, as shown at 32. The magnet
29 is connected in circuit 33 with a pair of switch
contacts 34 which latter are in the path of a cam
30 35 on the program control rotor 29. The cam 35
is disposed to affect contact 34 at or near the
end of the go period for the cross road, or at the
beginning of the caution period that follows, so
that a late arriving vehicle will command the right
of way regardless of its time of arrival, The
magnet 28 should be more powerful than the
magnet 29 in order to assure opening of the cir
cuit 21 in the event that both magnets 28 and 29
are energized simultaneously.
When a late arriving vehicle that is, one arriv
ing just as a change of signal is about to take
place, passes over the vehicle operated switch II
it will be seen that the circuit through the magnet
28 will be closed and the magnet thus energized
45 attracts the armature 30 to open the switch 3|
in the circuit 2‘! which controls the motor stop
ping electro-magnet I2. Consequently, when the
advancing cam 25 closes the circuit 21 at the
contacts 26 and magnet I2 cannot be energized
50 to open the switch I 5 and stop the motor since its
circuit 27 is open at the switch 3|, as shown in
Figure 2. Thus the program control rotor must
continue to another revolution during which time
the late arriving vehicle may proceed safely across
21 at the contacts 26 the magnet I2 will be ener
gized to open the switch I5 and break the motor
circuit to stop the motor.
From the above it will be apparent that a ve
hicle on a cross road approaching a main high
way intersection will always command a go signal
and yet grant the trai?c on the main highway a 15
su?icient go interval to avoid unnecessary delay
for trai?c on the main'highway.
From the above description it is thought that
the construction and. operation of the invention
will be fully understood without further explana 20
What is claimed is:
In a tra?ic control system of the class described,
a program control rotor, an electric motor for
driving the rotor. a motor circuit which when 25
closed energizesthe motor and when opened re
energizes the motor, a switch in the motor cir
cuit, opposed electro-magnets one of which closes
the switch and the other of which opens the
switch, a vehicle operated switch connected in 30
circuit with the switch closing electro-magnet,
switch means operated by the rotor and control
ling the electro-magnet which opens the motor
circuit switch to normally con?ne the rotor to a
single revolution; and means for permitting the 35
rotor to continue through more than one revolu
tion when the vehicle operated switch is actuated
just as a change of signal is about to take place
comprising a circuit, a switch in said circuit, op
posed electro-magnets one of which closes the 40
switch and the other of which opens the switch,
the electro-magnet which opens the switch being
connected in series with the vehicle operated
switch and being connected in parallel with the
electro-magnet which closes the motor circuit 45
switch, switch contacts in said circuit, the other
of the electromagnets being connected in series
with the switch contacts, and a cam on the rotor
for closing the switch contacts, coasting of the
motor permitting the rotor to move su?iciently 50
to disengage said cam from said switch contacts
to deenergize said electromagnet which opens said
Patent No. 2,151,818.
October h, 1958 .
It is hereby certified that error appears in the printed specification
of the above numbered patent requiring correction as follows: Page 1, first
column, line 2, for "sgnal" read signal; page 2, first column, line LL9,
for "and magnet" read the magnet; same page, second. column, line 26-27,
for "re-energizes" read de-energizes; and that the said Letters Patent
should- be read with this correction therein that the same may conform to
‘the record of the case in the Patent Office.
Signed- and sealed this‘ Zhth day of January, A, D.‘ 1959..
Henry Van Arsdale
Acting‘ Commissioner'of Patents.
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