Abstract:
An extra high light density fluorescent luminaire having an upper portion and a lower portion one of, said portions having at least one advertising sign thereon.

Description:
RELATED APPLICATION 
   This application claims priority to Canadian Patent Application No. 2,419,484, filed on Feb. 21, 2003. 
   FIELD OF THE INVENTION 
   This invention relates to fluorescent lighting fixtures. In particular, this invention relates to extra high light density fluorescent luminaires. 
   BACKGROUND OF THE INVENTION 
   It is common practice to use Lighting fixtures employing fluorescent lamps, to provide the main lighting of large and small spaces, replacing or complementing incandescent lights in the majority of commercial and industrial applications. 
   Fluorescent lighting fixtures are commonly made to direct the lamp light downward towards the floor or upwards towards the ceiling or in a combination of both to meet the particular user needs in offices, stores, mass merchandizing areas or factories, wherever fluorescent lights are used 
   It is also common to use reflectors behind the lamps and diffusers in front of the lamps to control where the emitted light is being directed and to place the electrical components in special sides of the fixtures. 
   It is common also to install fluorescent luminaries in long linear lines due to the limited number of lamps, usually 4 to 6 that the lighting fixture can accommodate side by side in the standard 2 foot wide fixture size used by the industry. 
   The disadvantages of the present practice are that a larger number of fixtures are required per installation due to the fewer lamps each fixture can accommodate. The limited possibilities of installing the fixtures over the space to be lighted except in end to end in long rows and the limitation of the fluorescent fixture applications to low and medium height ceilings of about 15 to 20 ft due to the small number of lamps per fixture, and the time and cost of individually mounting or changing the electrical components inside the fixture. 
   It is also common practice at present, to use two types of fluorescent fixtures in the same commercial space, one to provide the general space lighting and another lighting fixture to display commercial messages or directional signs on the sides of that fixture. 
   The disadvantage of these special illuminated display fixtures is that they are expensive, require special independent installation and they add to the cost of the lighting installation and are only visible in the direct areas where they are installed. 
   Examples of the prior art are U.S. Pat. No. 6,024,468 (issued Feb. 15, 2000, Kassay et al) and U.S. Pat. No. 6,428,183 B1 (Aug. 6, 2002, McAlpin). 
   Improvements are continuously sought to improve optical efficiency and to reduce cost of luminaries. 
   SUMMARY OF THE INVENTION 
   According to the present invention there is provided a luminaire comprising a lower portion, an upper portion, said lower portion having at least one lamp to illuminate the space therebeneath, said upper portion having at least one lamp to illuminate each advertising sign thereon, one or more side panels on one of said portions for supporting at least one advertising sign and said upper portion having at least one lamp to, in use, illuminate each advertising sign thereon. 
   As used herein, the term “dome-shaped” means having a circular, elliptical, rectangular or square-shaped base and having one or more sides upstanding therefrom and curving towards a peak. 

   
     DESCRIPTION OF THE DRAWINGS 
     Embodiments of the invention will now be described by way of example with reference to the accompanying drawings in which: 
       FIG. 1  shows a finished luminaire according to one embodiment; 
       FIG. 2  shows the luminaire of  FIG. 1  in exploded view to show the component parts; 
       FIGS. 3 through 29  show the construction of the finished luminaire of  FIG. 1  by showing all the individual components and the step by step sequence in which they fit together to provide the various aspects of the embodiment; 
       FIG. 3  shows the luminaire box or compartment; 
       FIG. 4  illustrates the back side or top of the luminaire box or compartment showing the corner slots; 
       FIG. 5  illustrates the luminaire box or compartment showing the perimeter rails attached and support tubes; 
       FIG. 6  illustrates the luminaire box or compartment showing the perimeter rails and support tubes attached and the wiring conduit; 
       FIG. 7  illustrates the top wiring/suspension box and outlet box assembled together; 
       FIG. 8  shows the top wiring/suspension box; 
       FIG. 9  illustrates the wiring connection box; 
       FIG. 10  illustrates the assembly attached to the support tubes; 
       FIG. 11  illustrates the opaque shielding panels placed in rail and bent to touch the support tubes; 
       FIG. 12  illustrates the shielding retainer item attached to retain shieldings; 
       FIG. 13  illustrates a lamp item used to light the dome; 
       FIG. 14  illustrates removable advertising panels to be inserted on top of the permanent shielding shown on the side; 
       FIG. 15  illustrates removable sign panel being inserted on top of the permanent panel; 
       FIG. 16  shows the translucent advertising panel fully inserted; 
       FIG. 17  shows the finished top dome with all the items installed; and from a different angle to that of  FIG. 1 ; 
       FIG. 18  illustrates the bottom of the luminaire box or compartment; 
       FIG. 19  illustrates the curved socket support brackets; 
       FIG. 20  illustrates the socket support bracket shown with 10 socket positions filled with sockets; 
       FIG. 21  illustrates reflectors attached to the socket support; 
       FIG. 22  illustrates another view of the socket support item with reflectors installed; 
       FIG. 23  illustrates the backside of socket support item and reflector assembly with brackets item added; 
       FIG. 24  illustrates the modular wiring arrangement showing socket support brackets, reflector, ballast plus sockets and all wiring on one assembly for quick insertion in box; 
       FIG. 25  illustrates the complete assembly of socket support modular assembly in the luminaire housing; 
       FIG. 26  illustrates the complete lower compartment of the housing showing 10 lamps installed; 
       FIG. 27  illustrates an alternate socket installation with ballasts installed in the box; 
       FIG. 28  illustrates the complete lower compartment with reflectors and socket supports, less lamps; and 
       FIG. 29  illustrates the complete lower compartment with lamps. 
   

   DETAILED DESCRIPTION 
   Referring to  FIG. 1  there is shown a completed luminaire and the component parts thereof are shown in  FIG. 2  to comprise box  1 , four perimeter angle rails  2 , four support tubes  3 , top wiring and suspension box  4 , wiring connection box  5 , socket support  6 , socket support bracket  6   a , two opaque shielding panels  7 , two shielding retainers  8 , opaque sign panels  9 , a number of reflectors  10 , a number of lamps  11 , and a ballast  12 . 
   Referring to the other figures,  FIG. 3  shows the box  1  with dimensions 24″×24″×4 ½″, but it may have different dimensions as required. 
     FIG. 4  shows the back side of the box  1  with corner slots  14 . 
   During construction of the luminaire, perimeter angle rails  2  and support tubes  3  are attached to the box  1  (as shown in  FIGS. 5 and 6 ). A wiring conduit  16  is added (as shown in  FIG. 6 ). 
     FIG. 7  shows the top wiring and suspension box  4  and wiring connection box  5  assembled together.  FIG. 8  shows the top wiring and suspension box  4  alone whist  FIG. 9  shows the wiring connection box  5  alone. 
   Referring to  FIG. 10  it will be seen that the top wiring and suspension box  4  and wiring connection box  5  are assembled with the four support tubes  3 . 
   Two opaque shielding panels  7  are then placed in the perimeter angle rails  2  and bent such that they touch the support tubes  3  as shown in  FIG. 11 . 
   Shield retainers  8  are attached to retain the opaque shielding panels  7  as shown in  FIG. 12 . 
   A lamp  13  is attached to illuminate the luminaire as shown in  FIG. 13 . 
   A typical removable opaque sign panel  9  is shown in  FIG. 14  and this is inserted on top of the permanent opaque shielding panel  7 .  FIG. 15  shows how the insertion takes place against perimeter rail  2  which holds it in position and  FIG. 16  shows an opaque sign panels  9  fully inserted. 
   In  FIG. 17  the completed luminaire is illustrated and comprises a lower portion  20 , including the box  1  with its ten lamps  11  installed as shown in  FIG. 29 . The upper portion  22  comprises the support tubes  3 , suspension box  4 , panels  7  and  9 , the latter having an advertising sign  24  thereon. The upper portion  22  includes lamp  13  as seen in  FIG. 13 . In use the lamps  11  illuminate the space beneath whilst lamp  13  illuminates the top portion including advertising sign  24 . 
   In  FIG. 20 , the socket supports  6  have been fitted with sockets  26  to receive the reflectors  10  (as shown in  FIGS. 21 and 22 ). 
     FIG. 23  shows the back side of  FIG. 21  with socket support bracket  6   a  added. 
   The modular wiring arrangement is shown in  FIG. 24  with the socket supports  6 , reflectors  10 , ballast  12 , plus sockets  26  and all wiring on one assembly for quick insertion in the box  1 . 
     FIG. 25  shows the complete assembly of socket support modular assembly in the box  1 . 
     FIG. 26  shows the ten lamps  11  installed. 
   In  FIG. 27 , there is shown an alternate socket  6  installation with ballast  12  installed in box  1 . 
     FIG. 28  shows the complete lower compartment with reflectors and socket support, but without the lamps, while  FIG. 29  shows the lamps  11  installed. 
   The illustrated embodiments in the figures are for an improved fluorescent luminaire with a novel socket support plate design to make a 2 ft wide fluorescent luminaire accommodate up to 10 high output modern T-5 fluorescent lamps rather than 4 or 6 lamps of the present practice. The box  1  is shown as of square plan view but it will be understood that it may be rectangular, elliphiral, or circular. If circular, the support tubes  3  may not be required and the upper portion will effectively comprise a single side panel. 
   This increased lamp density per luminaire, reduces the number of luminaries per installation. It also provides installation flexibility in individual rather than in continuous linear row mounting and the high light density makes it possible to use fluorescent fixtures mounted at high elevations where ceiling heights may reach 30 or 35 ft which was not practical with conventional luminaries. 
   A modular type luminaire is illustrated where all the electrical components such as ballasts, lamps and sockets can all be pre-assembled as a modular unit that can, quickly and easily, be inserted or removed from the luminaire. This modularity appreciably reduces the cost of the fixture assembly and allows the use of many different ballast lamp combinations in the same housing in a quick and easy manner. 
   There is illustrated an improved fluorescent luminaire that provides both main lighting of space and at the same time provides the sign or advertising lighting from the same luminaire rather than from two independent luminaries as in the present practice by incorporating a specially designed top with 4 luminous sides on which logos, signs or advertising material posters can be placed and exchanged easily without affecting any of the luminaire functions or its safety features. 
   The general space lighting function of this improved fixture is provided through the lower section of the fixture while the commercial messages or directional signs are provided through the top section, thus combining two functions in one luminaire with big savings in installation and in operation cost. 
   Furthermore, the utility of a fluorescent luminaries commonly purchased for the sole purpose of lighting space in commercial or industrial applications is increased since it is converted into a revenue generating luminaire through the capability of the improved design to carry messages and product advertisements and the possibility of selling same for the same luminaire. 
   A further advantage of the described embodiment is that the signs displayed by this improved fixture are not restricted in viewing to the immediate vicinity of the luminaire but are visible from across a wide floor area due to the high installation location of the luminaire. 
   It will also be appreciated that the upper compartment can be alternately used to provide services such as emergency or night lighting without affecting the main lighting provided by the luminaire while maintaining its advertising capability. 
   There is described a flexible suspended mounting capability that allows multi-circuit entry connection in various forms and that provides an appealing visual appearance while providing increased installation security of a suspended fluorescent fixture due to the special design of its mounting attachment. 
   While the invention has been described with reference to specific embodiments, modifications and variations of the invention may be constructed without departing from the scope of the invention, which is defined in the following claims.