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Патент USA US3078450

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Feb. 19,- 1963
w. “.JEFFERS
I
3,078,442>
TRAFFIC CONTROL SYSTEM
32
Filed March 2s, 1960
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INVENTORI
’_ 24
WALTER M. JEFFERS,
BY ÈMMW
HIS ATTORNEY.
United States Patent YClitice
l
srwsasz
TRAFFIC Contact. SYSTEM
Walter M. Jeifers, Syracuse, NX., assignor to Crouse
Hinds Company, Syracuse, NX., a corporation of New
York
3,078,442
Patented Feb. 19, '1.963y
2
traffic control system wherein the master controller may
be connected to the secondary controllers to permit the
actuation of a plurality of trañic controlled functions by
a single wire.
The invention consists in the novel features and in the
combinations and constructions hereinafter set forth and
Filed Mar. 28, 1960, Ser. No. 18,027
3 Ciairns. (Cl. S40-»40)
claimed.
In describing this invention, reference is had to the ac
companying drawings in which like characters designate
This inventori relates to and has as an object a new
corresponding parts in all the views.
and improved traffic control system of the intercon 10
In the drawings:
,
nected type.
FIGURE 1 is a schematic illustration of a traffic con
Certain of such interconnected trañic control systems
trol system embodying this invention.
utilize a master supervisory controller and a plurality
of secondary controllers located at the intersections along
the street or path of movement of the vehicular traffic.
Each of the secondary controllers is normally connected
FIGURE 2 is a circuit diagram of a portion of the
master controller shown to the -left of the figure which
is interconnected with one of the plurality of secondary
controllers, a portion of the circuit diagram of which is
lshown to the right of the ligure, the complete circuit dia
-to the master controller which is remotely located from
the secondary controllers so as to permit changes to be
gram illustrating the preferred embodiment of the inven
effected at the secondary controllers by various opera
20 tion.
'
tions at the master controller.
In FIGURE 1, the master controller indicated by the
Certain secondary controllers of such interconnected
traffic control systems utilize three timer dials, each giv
ing different periods of time for the right-of-Way to the
box 10 is remotely located from the intersections 12, 14,
16 and 18 of a plurality of cross streets with the main
street or highway 20. A plurality of secondary control
main and cross-streets of the intersection at which the sec
1ers indicated by the boxes 22, 24, 26 and 28 are located
25
ondary controller is located. The means for energizing
at the intersections 12 to 18 inclusive for controlling the
one of said dials and de-energizing the other of said
dials is located within the secondary controller and is
actuated from the master controller. In addition, the sys
traflic movement at the intersections, and each of the
secondary controllers is connected to the master control
ler by the wires 30 and 32. The illustration of FIGURE
tem may be arranged so as to permit what is known in
l is shown by way of example only and is not intended to
the art as a progressive movement of the trañic along 30 be limiting in any manner since this invention can be
the highway or path of vehicular movement controlled by
utilized with any number of secondary conrtollers lo
the complete system. Such a progression is effected by
cated in any pattern or arrangement of intersections.
maintaining a predetermined “offset” or out-of-phase rela
In FIGURE 2, the master controller 1t), generally in
tion between each of the timer dials in .the secondary con
dicated by the dash lines to the left of the figure, is shown
trollers and a master supervisory timer dial in the master 35 as `being connected by the wires Si) and 32 to one of the
controller. In traffic control systems heretofore the con
secondary controllers indicated by the dash lines 28 to
the right of the figure.
sets is contained within each of the secondary controllers
In the master controller 10, the lines 34 and 56> are
and the selection of the particular control means is actu 40 connected at one end to operative means (not shown)
ated frorn the master controller.
for effecting a transfer from dial one of the secondary
trol means for maintaining one of a plurality of such off
.
Systems have heretofore been disclosed in which the
selection of the traffic control functions at the master oon
troller are effected at the secondary controllers by means
controllers to either of dials two or three, as the case
may be. This operative means may comprise a program
S'device or the like. As seen in FIGURE 2, the lines 34
of audio tones, pulsing devices, or the like. One problem 45 »and 36 are connected to the coils 38 and 4t), respectively,
in connection with such systems is the fact that in order
'of relays 42 and 44. The opposite side of the coils 3S
to effect the various traffic control functions at the sec
and 40 of the relays are connected to ground potential,
ondary controllers from the master controller it was nec
whereby when the lines 34 and 36 are connected through
essary to provide a single wire for each of such functions
,the programming device, or the like, to a hot feed, the
interconnected from the master controller to each of the 50 coils will be energized to actuate the relays 42 and 44.
secondary controllers, thereby necessitating the installa
Relay 42 is provided with a set of contacts, 46 and 43,
tion of a large wiring cable in conjunction with the instal
and relay 44 is also provided with a set of contacts, 59
lation of such systems.
and 52. Each of the contact sets 46 to 52 comprises a
The invention hereinafter disclosed is much simpler and
front and back fixed contact and a central movable con
more reliable by the selection of component parts having 55
tact,
as is conventional.
long useful life. The arrangement is such to insure proper
Through the circuitry comprising the preferred em
response at the secondary controller when a specific traf
bodiment of this invention energization of the relay 42
ñc control function is selected at the master controller.
will effect transfer in each of the secondary controllers
Power failure anywhere at any time in the system will
from timer dial one to timer dial three, or from dial two
not cause improper response when power is restored. This 60 to dial three, while energization of the relay 44 will effect
is true when even if the power is otf when a change is se
lected at the m-aster controller. Further, the system com
prising this invention eliminates the need for amplifiers
transfer from time .dial one to timer dial two. When
netiher of the relays 42 or 44 is actuated, timer dial one,
through circuitry comprising no part of this invention, will
and the like at the secondary controllers.
be maintained in an operative state.
Accordingly, it is an object of this invention to pro 65
Shown in the upper left-hand corner of the master
vide a traiiic control system comprising a master con
controller 10 in FIGURE 2 are three lines, 60, 62 and
troller and a plurality o-f secondary intersection control
64, which are connected to operative means (not shown)
lers, each of the secondary controllers having a plurality
in the master controller for selecting one of three offsets
of traflic control functions which are actuated from the
for each of the timer dial units in the secondary con
master controller, wherein the master controller is inter
trollers.
connected with each of the secondary controllers by not
Line 60 is connected at one side to the coil 66 of relay
more than two wires.
It is a further object of this invention to provide a
68 and at its opposite side to ground potential. Line 62
aerea/r2
3
is connected at one side to the coil 7i) of relay 72 and
its opposite side to ground potential, and in like manner
line ad is connected to one side of the coil 7d» of relay
'76, and at the opposite side to a ground potential. Re
secondary controller regulates. When it is desired to
switch from dial one at the secondary controller to dial
two in each of the `secondary controllers suitable opera
tive means in the master controller, such as a selectively
lays 68, 72 and 76 are each provided with a set of con
tacts 78, Si?, 82, 34, 86 and 88, and each of these Contact
operative switch or programming device, is actuated to
sets comprise front and back fixed contacts and a central
through the coil «itl of relay ¿ifi to ground potential.
This circuit thus energizes the relay d@ and moves the
movable Contact.
_
Through circuitry comprising no part of this invention,
each of the timer dials in the secondary controllers is
provided with means for establishing and maintaining one
of a plurality of predetermined> offset relationships be
connect line 3o to a hot feed thereby completing a circuit
middle contact of contact set 5'@ and 52 from the lower
contact, as shown in FIGURE 2, to the upper contacts.
This energization of relay ftd completes a circuit from
the secondary of a transformer 13d having its primary
connected across the power supply line 9d and 92. This
circuit comprises line 132 connected to the secondary of
tween each of the dials in the secondary controllers and
a master supervisory dial in the master controller. As
will be hereinafter described, any one of these offset rela
transformer 13th whichV is selected so as to provide an
tionships may be established on the dials of the second
output voltage on the line 132 of some value less than
ary controllers by selection from the master controller
the line voltage. In the embodiment shown and dc
and the thus selected offset relationship will also be auto
scribed, the transformer 13@ has been selected so as to
matically maintained from the master controller.
provi-de a voltage from the secondary through line 132
Each of the wires 6l) and 62 is connected to a program 20 of approximately 40 volts. The completed circuit com
device, for example, for switching from offsets two or
prises line 132, resistor 134 which serves to prevent a
three. As will be understood the wires 69 and 62 may
short circuit which would otherwise exist across the upper
also be connected through selectively operated switches
part of the transformer on positive voltage half cycles
so as to permit the energization of the coils of relay 68
when both relays 441 and 76 are energized. Line 132
and '72 to permit the transfer from offset one to either
of offsets two or three.
Wire 641s connected through a pair of contacts which
close once each time cycle by a master supervisory con
trol dial in order to maintain the desired offset relation
between the dials of the secondary controllers and the
master supervisory dial. When the master supervisory
dial (not shown) closes its contact a hot feed is connected
to the line 64 thereby completing a circuit through coil
74 of the relay 76 to the ground potential thus energizing
relay 76. Through appropriate circuitry (not shown) in
the secondary controllers, the closing of the supervisory
contacts in the master controls automatically checks and
is connected to the upper contact of contact set
and
52 of relay 44 and through the middle contact which is
now in the up position by virtue of the energization of
relay 44 to line 136, which is connected to the lower con*
tact of contact set 46» and ¿lâ of relay d2, the middle
contact of the contact set, line 133 through a negative
biased rectifier 140, and line 32 to line 141 connected
to a negatively biased rectifier 1li/l similar to rectifier 15rd,
line 14o through the coil 148 of a relay 15d to line 152,
which is connected to the contact 154 through armature
35 156 of a relay 15S having a coil 160 and front contact
162, to line 164 which is connected to the common return
line 112 in the secondary controller. The circuit just
described energizcs the relay 15o thus moving the arma
ondary controllers and the master dial so as to prevent the
secondary kdials from deviating from the preselected offset 40 ture 166 into engagement with the contact 168 thereby
completing a second traffic control circuit from the hot
relation.
side 114 of the secondary power supply through line 17d,
Accordingly, the middle contact of the contact set S6
armature 172 of a relay 174 having a coil 176, a front
and SS of relay 76 is normally in the upper position when
maintins the offset relation between the dials in the sec
the power is on thereby completing a circuit from the hot
side 941 of a 6G cycle, 120 volt A.C. power supply having
contact 17d and a back contact 180 to line 182, arma
ture 166, front contact 168 and line 18d which is con
a return or common line 92. This circuit comprises line 45 nected to the operative means (not shown), for effecting
9€), line 9d, the middle contact of contact set 88 and 86
and the upper contact of relay 76, line 96 through the
middle and lower contacts of Contact set 78 and Si) of
transfer in the secondary controllers from dial one t0
dial two.
Thus it will be seen that the operation of the first offset
means connected to line 122, and the transfer from dial
of contact set 82 and 84 of relay 72, line 98 to rectifier 50 one to dial two, are both effected through the line 32
relay 68, line §21?, through the middle and lower contacts
160, polarized positively similar to rectifier 102, line 104,
which connects the master controls to the secondary con
trollers. Similarly, the transfer from dial one to dial
current limiting resistor 1416, coil 108 of relay 110, to a
three is effected through the line 32 in a manner to be
common return, line 112 in the secondary intersection
next described.
controller as for example, secondary controller 28, as
When a hot feed is placed on line 34, by either a
shown in FIGURE 2. This circuit energizes the coil 55
selective or an automatically operated switch to energize
168 of relay 11i), thus completing a first traffic control
the coil 38 of relay 42, the middle contact or“ the contact
circuit from the hot side 114 of the power Supply at the
set 46 and 4S is moved from the position shown in PEG
secondary controller through line 116, armature 11S of
URE 2 to the upper position where it is in engagement
relay 119, first contact 12@ and line 122 which is con`
nected to the operative means (not shown), for checking 60 with the upper contact.
This completes a circuit from line 9€) which is con
the offset relation between the timer dial which is running
nected to the hot side of the power supply at the master
in the secondary controller and the master supervisory
dial. As previously described, the de-energizaton of the
controller to line 9d, line 190, the upper Contact and
coil '7d of relay 76 once during each complete revolution
middle contact of contact set ¿26 and d3, line 138, through
65
of the master supervisory dial effects the de-energization
negatively biased rectifier 149, line 32, line 141 through
of relay 76 thus breaking the circuit just described through
the negatively biased rectifier 144, line 146, line 192,
the middle contact or” contact set 8o and 38 of relay 76.
resistor 194, through a Zener diode 196 to line 198,
through the coil 160 fof relay 158 to line 2li@ which is
This momentary breaking of the circuit serves to check
and maintain the desired offset relationship and comprises
connected to the common return line 112 in the secondary
70 controller.
The Zener diode 196 is selected so as to only pass
The secondary controllers are lso wired that in normal
negative full line voltage pulses through the diode. and
operation dial one is energized to establish the time cycle
no part of the inventionA
length and splits the right-of-way signal display between
the
the relay 158 is selected so as to be energized only by
and cross streets at the intersection which the 75 such full line negative voltage pulses.
The energization of the relay 158’ completes a circuit
7
aovaaaa
tions may be actuated from the master controller, >these
functions being in the example shown and described, the
selection of the second and third olïsets. As will be ob
vious, this is accomplished by utilizing oppositely polar
ized voltage pulses over the same Wire.
As seen in connection with the description of FIGURE
2, since each of the secondary controllers is provided with
d
quent elimination ofthe cost and trañic interruptions in
herent in such multi-cable installations.
What l claim is:
1. In a trame control system including a master super
visory controller and a plurality of secondary intersection
controllers, thev improvement comprising means for ener
gizing a plurality of trai’ilc control circuits in said sec
a local power supply having a common return line 112,
ondary controllers from said master controller comprising
there is no necessity for providing a common return line
a single function control wire interconnecting said master
interconnected between the master controller and each l0 and secondary controllers, means in said master control
of the secondary controllers.
As shown in FiGURE 2, rectiñers have been con
nected in parallel across the coils of relay 158, 15u,
MG, 222 and 242i. These rectiliers are conventional
and are utilized to hold the current between the voltage
ler for transmitting over saidv single function control wire
to said secondary controllers voltage pulses of full line
value having a first polarity and negative voltage pulses
of full line value and at least two selected voltage pulses
ofthe opposite polarity, one of said selected pulses being
pulses and prevent chatter in the relays.
of full line value and the other of said selected pulses be
As also shown in FlGURE 2, relays' 42, 44, 68, ’72
ing substantially' less than full line value to eñect more
'76 may be load type relays for increased long life.
than’ two trañ‘ic control functions, means in each of said
it is to be understood, however, that any suitable relay
secondary’ controllers being responsive to- said positive
may be used Without departing from the scope of the 20 full line value voltage pulses and said negative full line
invention. Also in this connection, relays 116, 15G, 15S,
value and less than full line value voltage pulses to selec»
171i, 222 and 24@ are illustrated as being low current type
tively energize more than two of said traffic control cir~
operating relays and, as will be understood, any suitable
cuits.
relays may be utilized.
2. The trañic control system of claim 1, wherein said
Also it is to be understood that Various other protective
master and secondary controllers are interconnected by a
devices such as lightning arrestors, fuses, current limiting
second single function control wire and means are pro
resistors, and the like, may be utilized wherever desirable
vided in said master controller for transmitting over said
without departing from the scope of the invention as de
second Wire positive and negative voltage pulses and
iined by the appended claims.
means in each of said secondary controllers responsive
The Zener diode 196 is connected in the line 192 in 30 to said pulses to actuate additionalv trañic control circuits.
a blocking direction and consequently Will conduct no
3. A traffic control system comprising a master control
current. When the voltage pulses reach the peak value,
ler and a plurality of secondary controllers, not more
however, the diode will give reverse conduction and if
than two function control wires interconnecting said mas
there is suf?cient current available to maintain the voltage
ter and secondary controllers, means in said master con
above the breaking point, the voltage drop remains con 35 troller for selectively transmitting positive and negative
stant, consequently when the Zener diode 196 is con
voltage pulses of a ñrst predetermined value over a ñrst
nected in series with the coil lo@ of theA relay 158 there
function control wire interconnecting said controllers,
is no voltage across the coil until the break down voltage
means for transmitting a voltage pulse of a second and
of the diode is exceeded. Thereafter, any increase in
different predetermined value over said first function con
voltage appears across the coil of the relay and serves to 40 trol Wire, means for selectively transmitting voltage pulses
energize the relay since the voltage drop across the diode
of opposite polarity over a second function control wire
does not increase. The resistor 194» is connected in series
interconnecting said controllers, means in said secondary
with diode 196 to prevent any damage to the diode by
controllers responsive to said voltage pulses transmitted
excessive voltage.
over said ñrst function control wire to actuate first, sec
Consequently, it willV be seen that a plurality of traine 45 ond and third traflìc control circuits, and further means
control circuits (illustrated to be ñve in number), each
in said secondary controllers responsive to said voltage
effecting different trafñc control functions may be actu
pulses transmitted over said second function control Wire
ated from the master controller over either ia single Wire
to actuate fourth and iifth traiiic control circuits.
or a pair of Wires, as is desired, by utilizing the polarity
50
and strength of the power pulses over these wires.
References Cited in the ñle of this patent
This is a highly advantageous feature since it permits
UNITED STATES PATENTS
the installation of traíiic control systems which may be
interconnected by existing wires which already intercon
neet the intersections and the necessity for installing a
new multi-Wire control cable for interconnecting the mas- a
ter and secondary controls is eliminated With the conse
2,796,595
2,834,001
2,883,645r
2,932,003
Schulenburg _________ __ ïune 18,
Wilcox _______________ __ May 6,
Du Vivier ____________ __. Apr. 2l,
Barker _______________ __ Apr. 5,
i957
1958
1959
1960
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