U.S. patent number 3,867,718 [Application Number 05/257,797] was granted by the patent office on 1975-02-18 for portable traffic control system.
Invention is credited to Stephen S. Moe.
United States Patent |
3,867,718 |
Moe |
February 18, 1975 |
PORTABLE TRAFFIC CONTROL SYSTEM
Abstract
A portable traffic control system for use along a stretch of
road where normal traffic movement must be altered for one reason
or another. The system includes a pair of remotely and
independently radio-controlled lamp-containing signal-display units
which may be placed at opposite ends of the road stretch, and
controlled by an operator from a remote hand-held transmitter.
Optical systems are provided in these units which enable the
operator to monitor from the back sides of the units the lighted
conditions of the lamps therein.
Inventors: |
Moe; Stephen S. (Springfield,
OR) |
Family
ID: |
22977790 |
Appl.
No.: |
05/257,797 |
Filed: |
May 30, 1972 |
Current U.S.
Class: |
340/908 |
Current CPC
Class: |
G08G
1/0955 (20130101) |
Current International
Class: |
G08G
1/0955 (20060101); G08G 1/095 (20060101); G08g
001/07 () |
Field of
Search: |
;340/40,41,84,74,30,31,32,33,171R ;343/225,228 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Caldwell; John W.
Assistant Examiner: Wannisky; William M.
Attorney, Agent or Firm: Kolisch, Hartwell, Dickinson &
Stuart
Claims
1. A portable traffic control system comprising
a pair of portable signal-display units adapted to be placed for
use at spaced-apart points, each of said units including a
signal-display element observable from one side of the unit and
placeable selectively in signaling and nonsignaling states and
means enabling monitoring of the states of said element
simultaneously from the opposite side of the unit, and
signal-display actuating means including a portable remote control
device operatively coupled to each of said signal-display elements
of said units, said signal-display actuating means employing
radio-frequency communication and comprising a radio-frequency
receiver for each signal-display unit, said remote control device
comprising a radio-frequency transmitter including a pair of
independently actuatable means actuatable to effect communication
by said transmitter from a remote location selectively and
exclusively with a different one of said receivers independently of
communication with the other receiver, such independent
communication capability enabling the establishment from such a
remote location of a plurality of different selected traffic
movement
2. The system of claim 1, wherein each signal-display element
comprises a lamp, and the means enabling monitoring of the state
thereof comprises an optical system disposed adjacent said lamp for
directing light produced thereby outwardly away from said opposite
side of the signal-display unit
3. The traffic control system of claim 1 wherein the signal-display
element comprises a lamp, a signal-display unit includes a lens
through which said lamp is observable on said one side of the unit,
and the means enabling monitoring of the state of the
signal-display element comprises another lens on said opposite side
of the unit laaterally offset from said
4. A portable traffic control system for controlling traffic
movement in a zone comprising
a pair of portable signal-display units, each having a front and a
back side, and each including a signal-display element placeable
selectively in signaling and nonsignaling states, with the state of
such element at any given time being observable simultaneously from
both of said sides,
said units being adapted to be placed for use at spacedapart points
in said zone, with said front sides facing outwardly of the zone,
and said back sides facing into the zone, and
signal-display actuating means comprising a radio-frequency
receiver for each signal-display unit, and a remote control device
for the receivers of the two units comprising a radio-frequency
transmitter, said radio-frequency transmitter including a first
actuating means actuatable to place the transmitter in one
selectively controlled transmitting state for communicating
selectively and exclusively with one of said receivers
independently of the other, and a second actuating means actuatable
independently of said first actuating means to place the
transmitter in another selectively controlled transmitting state
for communicating with the other receiver independently of said one
receiver, such independent communication capability enabling the
establishment from the location of said transmitter of a plurality
of different selected traffic movement conditions in said zone.
Description
BACKGROUND AND SUMMAARY OF THE INVENTION
This invention pertains to a portable traffic control system. More
particularly, it pertains to such a system which may be used along
a stretch of road where, because of construction or some other
reason, normal traffic movement must temporarily be altered.
As is well known, there are many situations where normal traffic
flow must be modified somewhat along a stretch of road to
accommodate construction work, or something else, which extends
into the road. For example, there may be a stretch of road
extending along a construction work zone where slow moving
construction equipment may periodically enter for short periods of
time. In such a situation, it may be desired to allow normal
two-way traffic along the road stretch except at those times when
equipment must enter the road--at which times traffic in both
directions should temporarily be stopped. As another example, it is
often the case that one of the lanes in a two-lane road must be
blocked for an extended period of time, with alternate one-way
traffic permitted along the other lane.
The present invention contemplates a novel portable traffic control
system which may easily be set up for handling these and other
similar circumstances for satisfactorily controlling traffic
movement.
More specifically, the invention features a system comprising at
least a pair of lamp-containing signal-display units which may be
placed adjacent opposite ends of a road stretch where normal
traffic movement must be altered. Radio-frequency remote control is
employed in the system for controlling the lighted conditions of
lamps in these units, with selective and independent control
provided for the lamps in each of the units. With such selective
and independent control provided, it is a simple matter for an
operator of the system to adjust the lighted conditions of the
lamps as desired to handle the particular traffic situation. In
other words, the operator is provided a considerable amount of
flexibility by the proposed system.
Another important feature of the invention is that means are
provided in the signal-display units for indicating on the back
sides thereof (i.e., those sides which face into a work zone), the
particular lighted conditions then existing in the lamps in the
units. With such a feature, it is a simple matter for an operator
inside a work zone, i.e., between units, to know at all times
exactly what the signal conditions are in the units. Such a feature
is extremely important for reliable and safe control of traffic
movement.
DESCRIPTION OF THE DRAWINGS
These and other objects and advantages attained by the invention
will become more fully apparent as the description which follows is
read in conjunction with the accompanying drawings, wherein:
FIG. 1 is a simplified side elevation illustrating a system as
contemplated herein set up for controlling traffic movement along a
stretch of road;
FIG. 2 is an enlarged fragmentary cross-sectional view, taken
generally along the line 2--2 in FIG. 1, illustrating details of
construction in one of the signal-display units in the system of
FIG. 1; and
FIG. 3. is a diagram illustrating a circuit employed in the system
of FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
Turning now to the drawings, and referring first to FIG. 1,
indicated generally at 10 is an elongated stretch of read which
extends along a construction work zone 12, in which zone is
employed a portable traffic control system 14 constructed according
to the present invention. System 14 herein includes a pair of
signal-display units 16, 18, and a signal-display actuating means
including a pair of radio-frequency receivers 20, 22 and a
radiofrequency transmitter, or remote control device, 24. Receivers
20, 22 are associated with units 16, 18, respectively. Units 16, 18
are supported on stands 26, 28, respectively, along road 10
adjacent opposite ends of zone 12. Transmitter 24 is a hand-held
unit which, in FIG. 1 is held by an operator 30 located in zone 12
between the signal-display units.
Further describing the two signal-display units, which are
substantially identical in construction, and considering FIGS. 1
and 2 together, unit 16 includes a housing 32 inside of which are
suitably mounted three vertically spaced electrical lamps, or
signal-display elements, 34, 36, 38. Mounted on the front side of
housing 32 directly in front of lamps 34, 36, 38 are three front
lenses, or optical systems, 40, 42, 44, respectively. Lens 40 is
red, lens 42 amber, and lens 44 green. Suitably mounted inside
housing 32, for each of the three lamps therein, are reflecting
mirrors such as mirror 46 (see FIG. 2) provided for lamp 38. These
three mirrors reflect light from lamps 34, 36, 38, through rear
lenses 48, 50, 52, respectively, which are mounted on the back side
of housing 32. Lens 48 is red, lens 50 amber, and lens 52 green.
Each such associated mirror-lens pair is referred to herein also as
an optical system for its associated lamp. As can be seen clearly
in FIG. 2, lenses 44, 52, which are associated with lamp 38, are
constructed to project light therefrom outwardly in opposite
directions from housing 32 along offset, nointersecting,
substantially parallel and horizontal axes 55, 57, respectively.
The reason for such an arrangement will be more fully explained
later.
The optical systems just mentioned are also referred to herein as
monitoring enabling means; and these optical systems, together with
their associated lamps, constitute signal-display means.
As was mentioned earlier, unit 18 is substantially the same in
construction as unit 16. Thus, unit 18 includes lamps 54, 56, 58
corresponding to lamps 34, 36, 38, respectively; front lenses 60,
62, 64 corresponding to front lenses 40, 42, 44, respectively; and
reaar lenses 66, 68, 70 corresponding to rear lenses 48, 50, 52,
respectively. As can be seen in FIG. 1, the signal-display units
are positioned with their front lenses facing away from zone 12,
and their rear lenses facing into the zone.
Provided for powering receivers 20, 22, and also the lamps in units
16, 18, are batteries 72, 74, respectively. A cable 76 extends to
unit 16, and a similar cable 78 extends to unit 18.
The transmitter and receivers employed in system 14 are
conventional radio-control devices which communicate by way of an
amplitude-modulated radio-frequency wave. The particular
transmitter employed herein is provided with two signaling buttons
indicated at 24a, 24b. With the transmitter energized, on the
operator operating button 24a, the carrier frequency of the
transmitter is modulated at one preselected audio rate to which
receiver 20 is tuned. Thus, operation of transmitter button 24a
causes a control signal to be transmitted to receiver 20. Such a
control signal, however, is not responded to by receiver 22 which
is tuned to respond to another audio-modulating rate which results
with operation of transmitter button 24b. As a consequence of this
arrangement, it will be apparent that the radio-frequency
communication system provided enables selective and independent
transmission of control signals to the two receivers associated
with the two signal-display units.
But for the fact that receivers 20, 22 are tuned, as just
mentioned, to respond to different control signals coming from
transmitter 24, the receivers are otherwise substantially identical
in construction. In particular, and referring now to FIG. 3, each
receiver, such as receiver 20, includes an output terminal, such as
terminal 20a, on which a positive voltage pulse is produced on the
receiver receiving and responding to a control signal from
transmitter 24.
Explaining now further what is show in FIG. 3, indicated at 80, 82,
84 are three relays which are employed in conjunction with receiver
20 and control unit 16. Relay 80 is a conventional stepping relay
including a coil 80a, and three contacts 80b, 80c, 80d. Also
included in this stepping relay is a rotary wiper 80e. Relay 82 is
a conventional time-delay relay including a coil 82a, and a
normally open contact 82b. On coil 82a being energized herein, a
delay of about 6 seconds occurs before closure of contact 82b.
Relay 84 includes a coil 84a and a normally open contact 84b.
The positive output terminal of battery 72 is connected to a
conductor 86 which interconnects wiper 80e and the positive voltage
supply terminal of receiver 20. The negative terminal of the
battery is connected to a conductor 88 which extends both through
cable 76 to one set of sides of lamps 34, 36, 38, and also to the
negative supply terminal of receiver 20. Contacts 80b, 80c, 80d in
relay 80 are connected through conductors 90, 92, 94, respectively,
(which are contained in cable 76) to the other sides of lamps 34,
36, 38, respectively. One side of coil 80a in relay 80 is connected
through a conductor 96 to one side of relay contact 84b. The other
side of coil 80a is connected to a conductor 98 which interconnects
conductor 86 and one side of relay contact 82b.
The lower end of coil 82a in FIG. 3 is connected to conductor 88
through a conductor 100, and the upper end of this coil in the
Figure is connected through a conductor 102 to conductor 92.
The other side of relay contact 82b is connected through a
conductor 104 to a conductor 106 which interconnects the upper end
of relay coil 84a and output terminal 20a in receiver 20. A
conductor 108 connects the lower end of coil 84a and conductor 88.
A conductor 110 connects conductor 108 to the other side of relay
contact 84b.
A circuit similar to that just described in FIG. 3 interconnects
unit 18, receiver 22 and battery 74.
Explaining now how the system described herein may be used, and
considering, for example, the controlling of signal displays
presented by unit 16, let us refer for this purpose to FIG. 3 in
the drawings. Under the circumstances illustrated in this figure,
the coils in relays 80, 82, 84 are deenergized, and lamp 34 is lit
(i.e., is in a signaling state). As a consequence, beams of red
light are projected from the lamp--forwardly through lens 40 and
rearwardly through lens 48. This, of course, signals traffic
approaching zone 12 from the left in FIG. 1 to stop.
When it is desired to change this condition to indicate that
traffic from this direction can move through the work zone, button
24a in transmitter 24 is operated to send a control signal to
receiver 20. On this occurring, the receiver produces a
shortduration positive voltage pulse on its output terminal 20a,
which pulse momentarily energizes coil 84a. With energizing of this
coil, contact 84b closes momentarily to energize coil 80a
whereupon, wiper 80e moves out of contact with contact 80b, and
into contact with contact 80d. On such a change occurring, lamp 34
turns off (i.e., is placed in a nonsignaling state), and lamp 38
turns on. With lighting of lamp 38, beams of green light are
projected therefrom--forwardly through lens 44 and rearwardly
through lens 52. This situation remains until further operation of
transmitter button 24a.
When it is desired to return to a condition with lamp 34 lit,
transmitter button 24a is again operated to send another control
signal to receiver 20. Receiver 20 then again supplies a momentary
positive voltage pulse to its output terminal which causes
momentary energizing of coil 84a and closing of contact 84b. Such
action again results in momentary energizing of relay coil 80a,
which energizing results in movement of wiper 80e into contact with
relay contact 80c. With closure of wiper 80e and contact 80c, lamp
36 lights, causing beams of amber light to be projected from the
lamp forwardly through lens 42 and rearwardly through lens 50.
In addition, relay coil 82a becomes energized, and about 6 seconds
later, as mentioned earlier, closes its associated contact 82b.
With closure of contact 82b, positive voltage from battery 72 is
supplied to energize coil 84a, whereupon contact 84b again closes.
And, such action results in relay coil 80a again energizing, with
the result that wiper 80e closes upon contact with 80b. Thus, lamp
36 turns off, and lamp 34 again lights up.
It will thus be apparent that successive operations of transmitter
button 24a result, in one instance, in unit 16 changing from a
condition displaying a red light to a condition displaying a green
light, and in the next instance from a condition displaying a green
light, through a condition temporarily displaying an amber light,
and finally to a condition again displaying a red light. Such
operation results without any change necessarily occurring in the
lighted conditions of lamps in display unit 18.
Similar operation is, of course, producible with respect to the
lamps in display unit 18 with successive operations of transmitter
button 24b.
It will be apparent, therefore, that only a single operator is
required to control the operations of the signal display units.
This operator may be one who is located in the work zone, and who
may perform therein tasks other than simply operating transmitter
24.
Because of the fact that the lighted conditions of the lamps inside
the display units are monitorable from the rear sides of the units,
i.e., within the work zone between them, an operator in the zone
will always be able to tell exactly what the lighted condition of
each display unit is.
With the lenses provided for each lamp in a display unit axially
offset, and constructed to project light beams along offset
nonintersecting axes, spurious light transmission directly from one
lens to another is not possible. Such transmission is, of course,
undesirable, since it might result in a confusing indication as to
the lighted condition in a display unit.
It should be noted that while a particular system has been
described herein as having a particular arrangement of lamps and
lenses, and as using only two signal-display units, modifications
are possible. For example, there might be applications where a
flashing amber light might be desired instead of a steady green
light. Also, there might be situations where more than two
independent signal-display units are wanted.
Thus, while an embodiment of the invention has been described
herein, it is appreciated that various modifications may be made
within the scope of the invention to take care of particular
situations.
* * * * *