FORM 2
THE PATENTS ACT, 1970 (39 of 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF INVENTION
A lighting fixture
APPLICANTS
Name : CROMPTON GREAVES LIMITED
Nationality: Indian Company
Address : CG House, Dr Annie Besant Road, Worli, Mumbai 400030, Maharashtra, India
INVENTORS:
Sathe Mahesh Kashinath and Guruprasad Kuppu Rao, both of Crompton Greaves Ltd , Industrial Design Centre, CG Global R&D Centre, Kanjur (E), Mumbai 400042, Maharashtra, India and Kizhakkekuttu Parameswaran Chandran, 503, III Cross, Muthyala Nagar, MES Road, Bangalore - 560 054, Karnataka, India, all Indian Nationals
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

FIELD OF INVENTION
This invention relates to a lighting fixture.
PRIOR ART DESCRIPTION
A lighting fixture generally used for lighting open places like streets or gardens comprises
an elongate enclosure provided with a mounting flange at the lower end thereof. The elongate enclosure is mounted on a mounting surface, usually a steel plate embedded in a precast cement concrete block, using fixing screws engaged in the screw holes provided in the mounting flange at the lower end of the enclosure. A lamp is fitted in a lamp holder located within the elongate enclosure towards the upper end thereof. A translucent cover is located on the lamp holder around the lamp. The upper end of the elongate enclosure is covered with a top cover. In such a construction of the lighting fixture, the screw holes in the mounting flange at the lower end of the elongate enclosure and also the fixing screws are exposed. Therefore, chances of rusting and damage to the screws over a period of time are increased. Water can also easily seep into the enclosure from the lower end thereof. This not only reduces the life of the lighting fixture but also reduces or spoils the aesthetic look of the lighting fixture. Due to the enclosure being elongate and supported only at the lower end thereof, it is like a cantilever. As a result of wind loading and forces acting on the elongate enclosure continuously, there are strong possibilities of the elongate enclosure tilting and getting damaged over a long period of time. Tilting of the elongate enclosure also spoils the aesthetic look of the lighting fixture. Damage to the fixing screws also will loosen the elongate enclosure on the steel plate and tilt the enclosure. The adverse effects of wind loading and forces may be minimized by having the elongate enclosure made of a mechanically strong material and/or increasing the material thickness of the elongate enclosure. This increases the material cost of the elongate enclosure. If there is a level difference in the steel plate, the elongate enclosure
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mounted on the steel plate also will have corresponding level difference. As a result, the perpendicularity of the elongate enclosure and the lamp in the enclosure is not maintained.
OBJECTS OF INVENTION
An object of the invention is to provide a lighting fixture having increased life and good aesthetic look.
Another object of the invention is to provide a lighting fixture which minimizes the cantilever effect.
Another object of the invention is to provide a lighting fixture which reduces the material cost.
Another object of the invention is to provide a lighting fixture which can be height adjusted to maintain the perpendicularity thereof.
Another object of the invention is to provide a lighting fixture which prevents seepage of water thereinto.
DETAILED DESCRIPTION OF INVENTION
According to the invention there is provided a lighting fixture comprising a non cantilever support structure comprising a flat base and a vertical oblong member height adjustably and detachably fitted at the center of the flat base, the flat base comprising centering pins projecting upwardly from the top surface thereof and mounting holes, the flat base being
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mounted on a mounting surface using fixing screws engaged in the mounting holes therein, an elongate enclosure having an upper portion which allows light to pass therethrough, the elongate enclosure further having engaging holes internally at the lower end thereof as equally spaced as the centering pins on the base plate and being located over the vertical oblong member with the centering pins on the flat base engaged in the engaging holes at the lower end of the elongate enclosure and with the lower end of the elongate enclosure overlying the mounting surface and resting against a skirting of the mounting surface, the mounting holes in the base plate and the fixing screws engaged therein lying concealed within the lower end of the elongate enclosure, the vertical oblong member being fixed to the elongate enclosure, the elongate enclosure further comprising a lamp holder fitted in the upper portion thereof, a translucent cover located in the upper portion of the elongate enclosure around a lamp to be fitted in the lamp holder and a top cover fitted at the upper end of the elongate enclosure.
The following is a detailed description of the invention with reference to the accompanying schematic drawings, in which
Fig 1 is a sectional isometric view of the lighting fixture according to an embodiment of the invention mounted on a mounting surface; and
Fig 2 is an exploded view of the lighting fixture of Fig 1.
The lighting fixture 1 as illustrated in Figs 1 and 2 of the accompanying drawings comprises a base plate 2, preferably made of stainless steel. The base plate is circular in shape and is provided with a tubular vertical projection 3 at the center thereof. The tubular vertical projection is externally threaded. The base plate is also provided with
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centering pins 4 projecting upwardly from the top surface thereof and mounting holes 5. 6 is a pipe, preferably made of galvanized iron. The lower end of the pipe is internally threaded and is removably fitted onto the tubular vertical projection in thread engagement therewith. The upper end of the pipe is provided with a mounting flange 7 having mounting holes 8 therein. 9 is an elongate enclosure flared at both ends and comprising an upper portion of ribbed structure comprising a plurality of spaced ribs 10. The ribbed upper portion of the elongate enclosure allows light to pass therethrough. The elongate enclosure is provided with engaging holes 11 internally at the lower end thereof as equally spaced as the centering pins on the base plate. The elongate enclosure 9 is located over the pipe 6 with the centering pins 4 on the base plate 2 engaged in the engaging holes 11 at the lower end of the enclosure and with the lower end of the enclosure overlying a mounting surface 12 and resting against a skirting 13 of the mounting surface. The mounting surface and its skirting may be made of cement concrete or reinforced cement concrete. The base plate 2 is fixed onto the mounting surface by screws (not shown) tightened in mounting holes 5 therein and matching holes 5a in the mounting surface. The mounting holes in the base plate and the fixing screws lie concealed within the lower end of the enclosure. 14 is a lamp holder with a flat bottom 15. Mounting holes provided in the flat bottom of the lamp holder are marked 16. Lugs provided in the upper portion of the enclosure are marked 17. Through holes in the lugs are marked 18. The flat bottom 15 of the lamp holder 14 and the mounting flange 7 at the upper end of pipe 6 are located against the upper end and lower end respectively of the lugs 17 and are fitted onto the lugs by fixing screws (not shown) passing through the mounting holes 8 in the mounting flange 7 at the upper end of the pipe 6 and through holes 18 in the lugs and mounting holes 16 in the flat bottom of the lamp holder. A lamp marked 19 is held in the lamp holder. 20 is a translucent lamp cover located around the lamp against the flat
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bottom of the lamp holder. 21 is a convex shaped top cover provided with screw holes
22 at the edge thereof. The elongate enclosure is provided with screw holes 23 at the upper end thereof matching with screw holes 22 in the top cover edge. The top cover is fitted at the top of the elongate enclosure by alien screws 24 tightened in the screw holes
23 and 22 at the upper end of the enclosure and in the top cover edge from below the upper end of the enclosure such that the alien screws lie concealed within the screw holes 23 at the upper end of the enclosure.
In the lighting fixture of the invention as illustrated in Figs 1 and 2, the mounting holes in the base plate and fixing screws tightened in the mounting holes in the base plate lie within the lower end of the elongate enclosure. Therefore, the mounting holes in the base plate and the fixing screws engaged therein are fully covered by the elongate enclosure at all times and seepage of water into the enclosure is avoided and rusting and damage to the screws are prevented over a long period of time. As a result, the life of the lighting fixture is increased. Aesthetic look of the lighting fixture is also improved. Instead of being fixed only at the bottom as in the conventional lighting fixture, the elongate enclosure of the lighting fixture of the invention is well located on the mounting surface and supported on the skirting of the mounting surface with the centering pins on the base plate (fixed on the mounting surface) engaged in the engaging holes at the lower end of the enclosure. Further the enclosure is fixed to the pipe and is held onto the pipe reinforced against cantilever effect and wind loading and forces. Therefore, tilting and damage to the lighting fixture is prevented over a long period of time, life of the lighting fixture is increased and aesthetic look of the lighting fixture is maintained over a long period of time. Due to the elongate enclosure being reinforced by the pipe, the material thickness of the elongate enclosure can be reduced or alternatively the elongate enclosure
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can be made of lighter materials so as to save cost. Even if the mounting surface on which the base plate is fixed is not at level, slight level adjustments can be made by moving the pipe vertically up or down against the tubular vertical projection as they are in thread engagement. This will help to maintain perpendicularity of the lighting fixture. The alien screws whereby the top cover is fixed to the top of the elongate enclosure, are fully covered and concealed. The concealed fixing of the top cover from below coupled with its convex shape further improves the aesthetic look of the lighting fixture. The top cover provides a crevices free surface. Accumulation of water on the top cover and seepage into the elongate enclosure are prevented. Rusting and damage to the fixing alien screws are also prevented.
The base plate need not be circular and the top cover need not be convex shaped. The non cantilever support structure can be of a different construction. Instead of the lower end of the pipe being internally threaded and the outer surface of the vertical tubular projection being externally threaded, the tubular projection can be internally threaded and the pipe can be externally threaded. The upper end of the pipe can be fitted onto the elongate enclosure differently. The elongate enclosure need not be flared at the ends thereof. The top cover can be fixed at the upper end of the elongate enclosure differently. The upper portion of the elongate enclosure need not be a ribbed structure. It can be of any construction allowing light to pass therethrough. The ribbed construction also adds to the aesthetic look of the lighting fixture. Rubber gasket may be provided between the top cover and the upper end of the enclosure to ensure a leak tight joint therebetween. Such variations of the invention are obvious to those skilled in the art and should be construed and understood to be within the scope of the invention.
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We claim:
1. A lighting fixture comprising a non cantilever support structure comprising a flat base and a vertical oblong member height adjustably and detachably fitted at the center of the flat base, the flat base comprising centering pins projecting upwardly from the top surface thereof and mounting holes, the flat base being mounted on a mounting surface using fixing screws engaged in the mounting holes therein, an elongate enclosure having an upper portion which allows light to pass therethrough, the elongate enclosure further having engaging holes internally at the lower end thereof as equally spaced as the centering pins on the base plate and being located over the vertical oblong member with the centering pins on the flat base engaged in the engaging holes at the lower end of the elongate enclosure and with the lower end of the elongate enclosure overlying the mounting surface and resting against a skirting of the mounting surface, the mounting holes in the base plate and the fixing screws engaged therein lying concealed within the lower end of the elongate enclosure, the vertical oblong member being fixed to the elongate enclosure, the elongate enclosure further comprising a lamp holder fitted in the upper portion thereof, a translucent cover located in the upper portion of the elongate enclosure around a lamp to be fitted in the lamp holder and a top cover fitted at the upper end of the elongate enclosure.
2. A lighting fixture as claimed in claim 1, wherein the flat base is circular and is provided with an externally threaded tubular vertical projection at the center thereof, the vertical oblong member comprises a pipe having threads internally at the lower end thereof and a mounting flange with screw holes at the upper end thereof, the lower end of the pipe being fitted over the tubular vertical projection in thread engagement therewith, the upper portion of the elongate enclosure is a ribbed structure comprising a plurality of
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spaced ribs, the mounting flange at the upper end of the pipe being screw fitted to the upper portion of the elongate enclosure and the top cover is convex shaped and is fitted at the upper end of the enclosure with alien screws engaged from below the upper end of the enclosure in a concealed manner.
3. A lighting fixture as claimed in claim 2, wherein the base plate is made of stainless steel and the pipe is made of galvanized iron.
4. A lighting fixture as claimed in any one of claims 1 to 3, wherein the elongate enclosure is flared at both ends.
Dated this 4th day of July 2007.
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