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Патент USA US2119049

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May 31, 1938.
L. B. GLA'FCKE
2,119,049
TRAFFIC SEMAPHORE
Filed Feb. 21, 19:55
-2 Sheets-Sheen'l ll
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May 31, 1933#
l.. B. GLAFCKÉ
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2,119,049
TRAFFIC SEMAPHORE
Filed Feb. 21, 1955
2 Sheets-SheeîI 2
_ ¿adm/ß. Gla/cke,
Patented May 31, 1938
2,119,049’
UNITED STATES PATENT OFFECE
2,119,049
TRAFFIC SEMAPHORE
Ludlow B. Glafcke, Salt Lake City, Utah
Application February 21, 1935, Serial No. 7,621
1 Claim.
This invention
relates
to
traflic
control
semaphores of the character of those used to con
trol traiiic on city streets yand other public high
ways.
The object of the invention is to provide an im
proved article of this nature by which traiiic
may be effectively lcontrolled with a minimum of
opportunity for mistakes upon the part of drivers.
To this end, a semaphore has‘been provided
which, in addition to ñashing the customary red,
green, and amber lights, is provided with a travel
ing indicator such as an arrow, for example,
movable in synchronism with the flashing of the
lights, in such fashion as to indicate to drivers
15 the length of time before the next succeeding
light change, so that the drivers may be prepared
for such changes, and will govern themselves ac
cordingly.
A further object of the invention is to provide
2 O a semaphore of the character indicated having
trañic control indicators visible to pedestrians
upon the sidewalk, and to cause pedestrian traffic
to move in properly timed relation to vehicular
tramo.
25
Further objects and advantages of the inven
tion will be set forth in the detailed description
which follows. In the accompanying drawings:
Fig. 1 is a front View of a traffic semaphore
constructed in accordance with the invention.
30
Fig. 2 is a horizontal sectional View there
through.
Fig. 3 is a fragmentary vertical section thereof.
Fig. 4 is a side view of a single unit having
pedestrian indicators incorporated therewith.
Fig 5 is a front view of the operating mecha
nism, hereinafter described, and
Fig 6 is a side view of the operating mechanism.
Like numerals indicate corresponding parts in
all of the ñgures of the drawings. In the form
40 of the invention illustrated in Figs. 1 and 2,
there is shown a four-sided casing having an in
dicator upon each of its faces. However, it is to
be understood that a single or double unit
semaphore may be employed by omitting certain
of the parts. Where the semaphore is to be
used, one upon each corner of the street, a single
unit semaphore will be employed (see Fig. 4),
while for center intersection use, the quadruple
unit illustrated in Fig. 1 may be suspended in a
50 known way at the center of the intersection.
Referring now to Fig. l, 5 designates a casing
having Stop and Go signs 5 and 6, upon each of
its four sides adapted to be illuminated inaknown
way by the red light 'I for Stop signs and the
' green light 8 for the Go signs.
Openings formed
(C1. 177-327)
in the four sides of the casing are covered by clear
convex glass lenses 9. Rotative opaque disks IIJ
are mounted inwardly of the lenses 9, and have
cut out or transparent sections II formed in
them. These sections may advantageously be of 5
arrow shape. A ring of flashed opal glass, in
dicated at I2,'lies outwardly of the opaque disk II
and is adapted to be illuminated at the time and
in the way hereinafter described.
A shaded pole synchronous motor of a conven 10
tional type, indicated at I3, drives through the
worm I4 to a worm wheel I5, this motor and the
associated parts upon the base Iâ being mounted
in the casing 5. Worm Wheel I5 is mounted on
a shaft I8', and this shaft carries a pinion I1 15
which drives the ñasher gear I8.
This flasher gear in turn operates the ñasher
segment I9, which, through the brushes 20, com
pletes the circuits to the various lights and
audible signal 30 as` hereinafter set forth.
In addition, the pinion I5 drives a crown gear
2i, which, through a readily detachable slip joint
connection 22, drives a vertical shaft 23.
This
shaft carries a crown gear 24 upon its upper end,
and this gear in turn imparts motion to the four
pinions 25, (Fig. 2), upon the shafts 26 of the
opaque disks I0.
A series of red lights R, one for each of the
disks Ill, are disposed to illuminate said disks,
and these lights 21 are energized simultaneously
with the energizing of the red lights 'I. In like
manner, a series of green lights G are arranged
to be energized simultaneously with the ener
gizing of the green light 8. An amber light 29
serves the usual function of a caution light.
When the semaphore is set for stop under the
action of the flasher, the corresponding red lights
'l illuminate the two opposed stop signs 5 from the
interior, while at the same time, the red lights R
illuminate the arrow II and ring I2.
40
Between the end of the stop period and the be
ginning of the go period, the amber or caution
light C alone may be used to illuminate the ring
I2, or this amber illumination of ring I2 may be
caused to take place at the end of the go period 45
and just prior to the beginning of the stop, thus
warning moving traflic that the change is about
to take place, so that late trai-lic will not enter
the intersection. Automobile drivers will be
taught by experience in the practical use of the 50
signal that a change will take place when the
arrow I I is in a vertical position and pointing
upwardly. If, then, the arrow travels clockwise
and the color changes from green to amber when
the arrow has traveled three-fourths of the way
2,119,049
2
around the circle, the driver will know that he
must wait until it travels the remaining one
fourth of the distance before the red will appear.
An audible signal such as an electrically operated
bell or whistle, indicated at 30, may be utilized as
an additional cautioning element.
An important feature of the invention is the
rotating arrow which indicates to the drivers the
completes a circuit 4|' through one set of the
red and green lights which illuminate the disks,
conductor 42, back to the positive side of the cir
cuit at 43. At the same time one set of the Stop
and Go lights for the signs 5 and 6 is energized
through conductor 44, back to the positive side
of the circuit, at 45. When a segment 46, at the
opposite end of the ñasher cylinder, contacts
approximate time yet available before the change brush 28o a circuit is completed through con
of the signal is to take place. Thus warned, 4ductor 4l, the other set of the red and green 10
lights which illuminate the rotative disks and
there is little excuse for a driver entering the
intersection late enough to be caught by the red back to the main positive lead at 48. Segment
light.
It will further be observed that the regulator
governing the lights, and the movable indicators
operate in synchronism without being intercon
nected other than for the fact that they are oper
ated from a common source of power.
The ar
rangement shown and described is of simple con
20 struction and will give long life with low main
tenance cost.
In the form of the invention illustrated in Fig.
1i, which illustrates a single unit semaphore
adapted to be used on street corners instead of
25 in the center of intersections, additional openings
3l and 32 are formed in an end wall of the casing
5a, so that the red and green lights 1 and 8 may
be visible therethrough for the purpose of indi
cating the condition of the semaphore to pedes
30 trians.
The ilasher may, of course, be arranged to con
trol the lights in any desired Way by varying the
position of the segments of. the flasher cylinder
in a way very common in the illuminated sign art.
35 However, one arrangement which may be re
sorted to is illustrated in Fig. 5, Where the cylin
der I9 of insulating material carries a grounding
ring lSa which through brush 20a and conductor
4l] constitutes the ground. A segment 4l extend
40 ing nearly half way around the cylinder makes
contact at the proper time with brush 2Gb. This
49 contacting with brushes 29e serves to complete
a circuit through conductor 50, an audible signal
36, back to the positive lead 48 and at the same 15
time completes a circuit through conductor 5l
and the caution light 52, back to the positive side
of the circuit at 45. The several segments 4I, 46
and 49 are suitably connected to the ground ring
20
IS as indicated by the dotted line X.
It is to be understood that the invention is not
limited to the precise construction set forth, but
that it includes within its purview whatever
changes fairly come within either the terms or
the spirit of the appended claim.
2.5
Having described my invention, what I claim is:
In a time lapse indicator for traiiic signals,
the combination with a casing having an opening
in a wall thereof, a lens covering said opening and
comprising a center clear glass section and a sur
30.
rounding annular translucent glass section, an
opaque disk located inwardly of and of a size to
substantially cover the clear glass section, means
for imparting rotation to said disk continuously
in one direction, said disk being provided with a 35
transparent indicator section through which light
may shine from the interior of said casing and
red, green and amber lights within said casing,
as and for the purposes set forth.
LUDLOW B. GLAFCKE.
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