CA2068183A1 - Blankout sign - Google Patents
Blankout signInfo
- Publication number
- CA2068183A1 CA2068183A1 CA 2068183 CA2068183A CA2068183A1 CA 2068183 A1 CA2068183 A1 CA 2068183A1 CA 2068183 CA2068183 CA 2068183 CA 2068183 A CA2068183 A CA 2068183A CA 2068183 A1 CA2068183 A1 CA 2068183A1
- Authority
- CA
- Canada
- Prior art keywords
- sign
- illuminated
- blankout
- enclosure
- front face
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 10
- 229920005372 Plexiglas® Polymers 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 2
- 229910052753 mercury Inorganic materials 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 2
- 229920002554 vinyl polymer Polymers 0.000 claims description 2
- 238000010926 purge Methods 0.000 claims 1
- 238000005286 illumination Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Landscapes
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
ABSTRACT
An illuminated blankout sign adapted to be exposed to ambient light, comprising an enclosure; light generating means within the enclosure; a front face for the enclosure adapted to change from a first colour when backlit via the light generating means to black when illuminated only by the ambient light; and indicia applied to the front face for conveying information, whereby the indicia are visible from outside of the enclosure with the first colour as background when the front face is backlit via the light generating means and the indicia are not visible from outside of the enclosure when the front face is illuminated only by the ambient light.
An illuminated blankout sign adapted to be exposed to ambient light, comprising an enclosure; light generating means within the enclosure; a front face for the enclosure adapted to change from a first colour when backlit via the light generating means to black when illuminated only by the ambient light; and indicia applied to the front face for conveying information, whereby the indicia are visible from outside of the enclosure with the first colour as background when the front face is backlit via the light generating means and the indicia are not visible from outside of the enclosure when the front face is illuminated only by the ambient light.
Description
2~6~8~
BI~NKOUT SIGN
Field o~_the Invention rrhis invention relates in general to illuminated signs, and more particularly to an illuminated blankout traffic sign.
Background of the Invention It is a common requirement of traffic signs that they must be visible in broad day light as well as in the darkness of night. A number of well known non-illuminated painted signs are available which are clearlyvisible by day. These signs typically incorporate a ra~lective surface coating adapted to enhance visibility at night in response to an automotive headlight beam impinging upon and reflecting off of the sign. However, these signs suffer from the shortcoming tha~ they are only visible when an extarnal light source is shined th~reon.
Another requirement for some traffic signs is that they be visible ~at day or night) only under certain conditions. Such signs are known as blankout signs. Fsr example, a blankout sign may be placed at a railway crossing to provide a no-left and no-right turn indication during a railway pre-emption call. Thus, the blankout sign must be completely visible in both daylight and night csnditions, but must also blankout completely in the absence of the pre-emption call.
A number of blankout signs are presently available.
However, none of the presently available signs provide the desired indication on a white or colored background, as is required under various legislated traffic acts (e.g Ontario Highway Traffic Act (OHTA), O. Reg.
667~78). For example, 3M Canada Inc. currently sells a blankout sign under the trade name Vari-Comm. This sign comprises a series of horizontal louvres that operats in thP manner of venetian blinds: when closed in one plane they form a blankout white colour and when rotated in the opposite direction they display the required no-left or no-right turn indication. The 3M Vari-Comm sign is illuminated by reflected light mounted in the sides of .
2 ~ 8 3 the sign so as to impinge upon the non translucent face material of the sign. This sign suffers from mechanical difficulties with the operation of the horizontal louvres, particularly in climates exhibiting very low winter temperatures.
A further prior art blankout sign is manufactured by Ferrenti-Packard Electronics and is illuminated in the same way as the Vari-Comm sign ~xcept that the non-translucent face consists of a matrix of tiny disks that are all of one colour, but when electromagnetically flipped they display the required symbol of no-left or no-right turn.
While both of the above-discussed known prior art blankout signs are capable of displaying an indication on a white or colored background, in accordance with the required legislative provisions, the signs are front illuminated and are of complex design and are prone to mechanical and electrical failure.
In addition, such prior art signs have encountered problems operating in daylight conditions. For example, the prior art illuminated signs have been known to succumb to a negative fade out condition when the sign is silhouetted against counter-vailing sunlight ~ince increased ambient light is provided in front of the sign.
In such counter-vailing light situations, the blankout signs according to the prior art are difficult to see at normal sight distances. In addition, it has been found that the no-left and no-right turn indications can be qeen in conditions of strong direct vailing sunlight when the illumination is turned off (this is known as "ghosting"). In some versions of the prior art illuminated blankout signs, the ghosting effect was reduced by making the sign background black. However, as discussed above, a black background is not acceptable under most gov rnmental traffic legislation~
Summary of the Invent on .
2~8~ 8~
According to the present invantion, an internally backlit illuminated blankout sign is prov.ided which conforms to the regulatory section o~ the Manual of Uniform Traffic Control Devices (Province of Ontario) for turn indication on a white or colored background, yet includes no moving parts.
According to an aspect of the invention there is provided an internally backlit illuminated blankout sign adapted to be exposed to ambient light, comprising:
a~ an enclosure;
b) light generating means within said enclosure;
c) a front face for said enclosure adapted to change from a first colour when backlit via said light generating means to black when illuminated only by said ambient light; and d) indicia applied to said front face for conveying information, whereby said indicia are visible from outside of said enclosure with said first colour as background when said ~ront face is backlit via said light generating means and said indicia are not visible from outside of said enclosure when said front ~ace is illuminated only by said ambient light.
Brief Description of the Drawings A preferred embodiment of the invention will be described in greater detail below with reference to the ~ollowing drawings, in which:
Figure 1 is a perspective view of the blankout sign according to the present invention;
Figures 2A and 2B are front elevation views o~ the blankout sign in blankout condition and illuminated condition, respectively;
Figure 3 is a partially exploded view o~ the blankout sign o~ Figure 1 without hood;
Figure 4 is a cross-sectional view through IV-IV in Figure 3;
2~8183 Figure 5 is a perspective view of the internal structure of the blankout sign shown in Figure 3; and Figure 6 is a cross-sectional view through VI-VI in Figure 3.
Detailed Description of the Preferred Embodiment Turning to the Figures, the blankout sign of the present invention is shown comprising an enclosure 1 to which an aluminium hood 2 is connected. The hood is sloped downwardly for drainage and to eliminate accumulation of snow. The hood functions in the same fashion as a traffic light visor for shading the sign in th~ presence of strong overhead light. The hood 2 is preferably painted grey on the exterior with a matte black finish on the inside.
The enclosure 1 is preferably in the form of an aluminum box which houses illumination means which are discussed in greater detail below with reference to Figures 4-6. The enclosure 1 preferably includes upper and lower ventilation louvres 3 and 4 on both sides of the sign. A hinged frame (not shown) is provided by which the ~ront surface 5 may be opened to reveal the internal structure of ~igures 4-6.
The external surface or front face 5 of the sign incorporates indicia 5A thereon for conveying such as traffic signal information, etc. According to an important aspect of the present invention, the front face 5 of the sign is manufactured from a Casocryl~ plexiglass surface which changes from black (when front illuminated) to white or colored (when back lit). The use of CasocrylT~ plexiglass is known in commercial signs to provide colour changes. For example, a commercial sign using Casocryl~ plexiglass may appear as one colour with ~; front ambient illumination but may change to another colour when illuminated from behind the plexiglass ; 35 surface. However, the use of Casocryl~ plexiglass for the creation of blankout tra~fic signs which fade to black in blankout condition and which exhibit a white .
2~
background when illuminated, is not believed to be hitherto known. Alternatively, the plexiglass surface may exhibit a coloured background when illuminated (e.g.
this would be useful for a blank out "yield" sign with a blank indication on a yellow ba~kground).
The required no-turn indication is applied to the Casocryl~ plexiglass surface 5 by means of coloured vinyl strips 6 applied to the inside surface of plexiglass face 5~
Turning now to Figures 4-6, a raceway 6 is provided with sockets on both sides of the sign to which a plurality of fluorescent lamps are mounted via appropriate fixtures at each end. Preferably, each of the lamps 7 are wired independently in order that the sign may be dimmed at night by reducing the number of illuminate lamps.
A pair of fans 8 are shown on each side of the sign adjacent the top louvres 3 for forcing air through the louvres 3. In particular, as shown best with reference to the airflow arrows of Figure 5, air is circulated through the enclosure for maintaining reduced temperature by being drawn in through the louvres 4 and purged via the ~ans 8 through louvres 3.
An electrical connection 9 is provided for powering the lamps 7.
Although not shown, a pair of ballasts are located at the top of the sign for controlling operation of the lamps 7.
Drain holes 11 (not shown) are preferably provided at the bottom of the sign to allow for the release of condensation from within the sign, etc. Mounting hardware (not shown) is also provided in a well known manner for securing the raceway 6 and fluorescent lamp sockets to the sign box.
A plurality of reflectors 10 are provided, one reflector hehind each lamp 7, and successive reflectors maeting intermediate each pair of fluorescent lamps 7.
2 ~ 8 3 The reflectors are V-shaped and are used to amplify the light created by the fluorescent lamps 7 in order to minimize the number of lamps required and therefore minimize heat generation within the sign which otherwise can result in overheating of the ballasts. Preferably, the reflectors 10 are fabricated from Silverlux reflective material.
Other modifications and variations of the invention are possible. For example, whereas fluorescent lamps were chosen for the successful prototype, it may be possible to use mercury vapour or other lamps. However, fluorescent lamps are thought to be preferable due to the immediate start up phase, long lamp life and absence of after image when the illumination is turned off.
Furthermore, although the preferred embodiment relates to a blankout sign for conveying a traffic signal, it is contemplated that the principles of the present invention may be applied to the creation of commercial, advertising, or other types of blanXout signs where indicia are provided on a neutral coloured background when the sign is backlit and wherein the sign fades when not backlit. All such modifications and variations are believed to be possible within the scope of the invention as defined by the claims appended hereto.
BI~NKOUT SIGN
Field o~_the Invention rrhis invention relates in general to illuminated signs, and more particularly to an illuminated blankout traffic sign.
Background of the Invention It is a common requirement of traffic signs that they must be visible in broad day light as well as in the darkness of night. A number of well known non-illuminated painted signs are available which are clearlyvisible by day. These signs typically incorporate a ra~lective surface coating adapted to enhance visibility at night in response to an automotive headlight beam impinging upon and reflecting off of the sign. However, these signs suffer from the shortcoming tha~ they are only visible when an extarnal light source is shined th~reon.
Another requirement for some traffic signs is that they be visible ~at day or night) only under certain conditions. Such signs are known as blankout signs. Fsr example, a blankout sign may be placed at a railway crossing to provide a no-left and no-right turn indication during a railway pre-emption call. Thus, the blankout sign must be completely visible in both daylight and night csnditions, but must also blankout completely in the absence of the pre-emption call.
A number of blankout signs are presently available.
However, none of the presently available signs provide the desired indication on a white or colored background, as is required under various legislated traffic acts (e.g Ontario Highway Traffic Act (OHTA), O. Reg.
667~78). For example, 3M Canada Inc. currently sells a blankout sign under the trade name Vari-Comm. This sign comprises a series of horizontal louvres that operats in thP manner of venetian blinds: when closed in one plane they form a blankout white colour and when rotated in the opposite direction they display the required no-left or no-right turn indication. The 3M Vari-Comm sign is illuminated by reflected light mounted in the sides of .
2 ~ 8 3 the sign so as to impinge upon the non translucent face material of the sign. This sign suffers from mechanical difficulties with the operation of the horizontal louvres, particularly in climates exhibiting very low winter temperatures.
A further prior art blankout sign is manufactured by Ferrenti-Packard Electronics and is illuminated in the same way as the Vari-Comm sign ~xcept that the non-translucent face consists of a matrix of tiny disks that are all of one colour, but when electromagnetically flipped they display the required symbol of no-left or no-right turn.
While both of the above-discussed known prior art blankout signs are capable of displaying an indication on a white or colored background, in accordance with the required legislative provisions, the signs are front illuminated and are of complex design and are prone to mechanical and electrical failure.
In addition, such prior art signs have encountered problems operating in daylight conditions. For example, the prior art illuminated signs have been known to succumb to a negative fade out condition when the sign is silhouetted against counter-vailing sunlight ~ince increased ambient light is provided in front of the sign.
In such counter-vailing light situations, the blankout signs according to the prior art are difficult to see at normal sight distances. In addition, it has been found that the no-left and no-right turn indications can be qeen in conditions of strong direct vailing sunlight when the illumination is turned off (this is known as "ghosting"). In some versions of the prior art illuminated blankout signs, the ghosting effect was reduced by making the sign background black. However, as discussed above, a black background is not acceptable under most gov rnmental traffic legislation~
Summary of the Invent on .
2~8~ 8~
According to the present invantion, an internally backlit illuminated blankout sign is prov.ided which conforms to the regulatory section o~ the Manual of Uniform Traffic Control Devices (Province of Ontario) for turn indication on a white or colored background, yet includes no moving parts.
According to an aspect of the invention there is provided an internally backlit illuminated blankout sign adapted to be exposed to ambient light, comprising:
a~ an enclosure;
b) light generating means within said enclosure;
c) a front face for said enclosure adapted to change from a first colour when backlit via said light generating means to black when illuminated only by said ambient light; and d) indicia applied to said front face for conveying information, whereby said indicia are visible from outside of said enclosure with said first colour as background when said ~ront face is backlit via said light generating means and said indicia are not visible from outside of said enclosure when said front ~ace is illuminated only by said ambient light.
Brief Description of the Drawings A preferred embodiment of the invention will be described in greater detail below with reference to the ~ollowing drawings, in which:
Figure 1 is a perspective view of the blankout sign according to the present invention;
Figures 2A and 2B are front elevation views o~ the blankout sign in blankout condition and illuminated condition, respectively;
Figure 3 is a partially exploded view o~ the blankout sign o~ Figure 1 without hood;
Figure 4 is a cross-sectional view through IV-IV in Figure 3;
2~8183 Figure 5 is a perspective view of the internal structure of the blankout sign shown in Figure 3; and Figure 6 is a cross-sectional view through VI-VI in Figure 3.
Detailed Description of the Preferred Embodiment Turning to the Figures, the blankout sign of the present invention is shown comprising an enclosure 1 to which an aluminium hood 2 is connected. The hood is sloped downwardly for drainage and to eliminate accumulation of snow. The hood functions in the same fashion as a traffic light visor for shading the sign in th~ presence of strong overhead light. The hood 2 is preferably painted grey on the exterior with a matte black finish on the inside.
The enclosure 1 is preferably in the form of an aluminum box which houses illumination means which are discussed in greater detail below with reference to Figures 4-6. The enclosure 1 preferably includes upper and lower ventilation louvres 3 and 4 on both sides of the sign. A hinged frame (not shown) is provided by which the ~ront surface 5 may be opened to reveal the internal structure of ~igures 4-6.
The external surface or front face 5 of the sign incorporates indicia 5A thereon for conveying such as traffic signal information, etc. According to an important aspect of the present invention, the front face 5 of the sign is manufactured from a Casocryl~ plexiglass surface which changes from black (when front illuminated) to white or colored (when back lit). The use of CasocrylT~ plexiglass is known in commercial signs to provide colour changes. For example, a commercial sign using Casocryl~ plexiglass may appear as one colour with ~; front ambient illumination but may change to another colour when illuminated from behind the plexiglass ; 35 surface. However, the use of Casocryl~ plexiglass for the creation of blankout tra~fic signs which fade to black in blankout condition and which exhibit a white .
2~
background when illuminated, is not believed to be hitherto known. Alternatively, the plexiglass surface may exhibit a coloured background when illuminated (e.g.
this would be useful for a blank out "yield" sign with a blank indication on a yellow ba~kground).
The required no-turn indication is applied to the Casocryl~ plexiglass surface 5 by means of coloured vinyl strips 6 applied to the inside surface of plexiglass face 5~
Turning now to Figures 4-6, a raceway 6 is provided with sockets on both sides of the sign to which a plurality of fluorescent lamps are mounted via appropriate fixtures at each end. Preferably, each of the lamps 7 are wired independently in order that the sign may be dimmed at night by reducing the number of illuminate lamps.
A pair of fans 8 are shown on each side of the sign adjacent the top louvres 3 for forcing air through the louvres 3. In particular, as shown best with reference to the airflow arrows of Figure 5, air is circulated through the enclosure for maintaining reduced temperature by being drawn in through the louvres 4 and purged via the ~ans 8 through louvres 3.
An electrical connection 9 is provided for powering the lamps 7.
Although not shown, a pair of ballasts are located at the top of the sign for controlling operation of the lamps 7.
Drain holes 11 (not shown) are preferably provided at the bottom of the sign to allow for the release of condensation from within the sign, etc. Mounting hardware (not shown) is also provided in a well known manner for securing the raceway 6 and fluorescent lamp sockets to the sign box.
A plurality of reflectors 10 are provided, one reflector hehind each lamp 7, and successive reflectors maeting intermediate each pair of fluorescent lamps 7.
2 ~ 8 3 The reflectors are V-shaped and are used to amplify the light created by the fluorescent lamps 7 in order to minimize the number of lamps required and therefore minimize heat generation within the sign which otherwise can result in overheating of the ballasts. Preferably, the reflectors 10 are fabricated from Silverlux reflective material.
Other modifications and variations of the invention are possible. For example, whereas fluorescent lamps were chosen for the successful prototype, it may be possible to use mercury vapour or other lamps. However, fluorescent lamps are thought to be preferable due to the immediate start up phase, long lamp life and absence of after image when the illumination is turned off.
Furthermore, although the preferred embodiment relates to a blankout sign for conveying a traffic signal, it is contemplated that the principles of the present invention may be applied to the creation of commercial, advertising, or other types of blanXout signs where indicia are provided on a neutral coloured background when the sign is backlit and wherein the sign fades when not backlit. All such modifications and variations are believed to be possible within the scope of the invention as defined by the claims appended hereto.
Claims (17)
1. An illuminated blankout sign adapted to be exposed to ambient light, comprising:
a) an enclosure;
b) light generating means within said enclosure;
c) a front face for said enclosure adapted to change from a first colour when backlit via said light generating means to black when illuminated only by said ambient light; and d) indicia applied to said front face for conveying information, whereby said indicia are visible from outside of said enclosure with said first colour as background when said front face is backlit via said light generating means and said indicia are not visible from outside of said enclosure when said front face is illuminated only by said ambient light.
a) an enclosure;
b) light generating means within said enclosure;
c) a front face for said enclosure adapted to change from a first colour when backlit via said light generating means to black when illuminated only by said ambient light; and d) indicia applied to said front face for conveying information, whereby said indicia are visible from outside of said enclosure with said first colour as background when said front face is backlit via said light generating means and said indicia are not visible from outside of said enclosure when said front face is illuminated only by said ambient light.
2. The illuminated blankout sign of claim 1 further comprising a hood for shading said front face in the presence of strong ambient light.
3. The illuminated blankout sign of claim 2 wherein said hood is provided with a neutral colour exterior finish and a matte black interior finish.
4. The illuminated blankout sign of claim 1 wherein said enclosure is provided with ventilation louvres for dissipating heat from within said enclosure.
5. The illuminated blankout sign of claim 4 further including at least one fan adjacent at least one of said louvres for purging said heat from said enclosure via said louvres.
6. The illuminated blankout sign of claim 1 wherein said front face is connected to said enclosure via a hinge.
7. The illuminated blankout sign of claim 1 wherein said front face is fabricated from Casocryl*
plexiglass.
plexiglass.
8. The illuminated blankout sign of claim 1 wherein said first colour is white and said indicia represent a no-turn traffic signal.
9. The illuminated blankout sign of claim 8 wherein said front face is fabricated from Casocryl*
Blank 'n' White* plexiglass.
Blank 'n' White* plexiglass.
10. The illuminated blankout sign of claim 1 wherein said indicia are fabricated from coloured vinyl strips applied to a surface of said front face which is internal to said enclosure.
11. The illuminated blankout sign of claim 10 wherein said indicia represent a no-turn traffic signal.
12. The illuminated blankout sign of claim 1 wherein said light generating means further comprises a plurality of lamps arranged so as to evenly illuminate said front face from within said enclosure.
13. The illuminated blankout sign of claim 12 further including a plurality of reflectors intermediate each pair of said plurality of lamps for amplifying the light generated by said lamps.
14. The illuminated blankout sign of claim 13 wherein said reflectors are generally V-shaped.
15. The illuminated blankout sign of claim 13 wherein said reflectors are fabricated from Silverlux*
material.
material.
16. The illuminated blankout sign of claim 14 wherein said reflectors are fabricated from Silverlux*
material.
material.
17. The illuminated blankout sign of claim 11 wherein said plurality of lamps are selected from the group consisting of fluorescent lamps or mercury vapour lamps.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB919109826A GB9109826D0 (en) | 1991-05-07 | 1991-05-07 | Blankout design |
| GB9109826.9 | 1991-05-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2068183A1 true CA2068183A1 (en) | 1992-11-08 |
Family
ID=10694554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2068183 Abandoned CA2068183A1 (en) | 1991-05-07 | 1992-05-07 | Blankout sign |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2068183A1 (en) |
| GB (1) | GB9109826D0 (en) |
-
1991
- 1991-05-07 GB GB919109826A patent/GB9109826D0/en active Pending
-
1992
- 1992-05-07 CA CA 2068183 patent/CA2068183A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| GB9109826D0 (en) | 1991-06-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |