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 THE INVENTION
A heat dissipating high-bay luminaire
APPLICANT (S)
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR (S)
Verma Vishal, of Crompton Greaves Ltd, Lighting R&D, Lighting Division, Crompton Greaves Ltd. Kanjurmarg(East), Mumbai - 400042, Maharashtra, India; An Indian National.
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 the Invention:
This invention relates to the field of lighting luminaires and thermal engineering.
Particularly, this invention relates to heat dissipation in lighting luminaires. More particularly, this invention relates to a heat dissipating high-bay luminaire.
Background of the Invention:
A light fixture, light fitting, or luminaire is an electrical device used to create artificial light and/or illumination, by use of an electric lamp. All light fixtures have a fixture body, a light socket to hold the lamp and allow for its replacement— which may also have a switch to operate the fixture, and also require an electrical connection to a power source, often by using electrical connectors. Light fixtures may also have other features, such as reflectors for directing the light, an aperture (with or without a lens), an outer shell or housing for lamp alignment and protection, and an electrical ballast and/or power supply.
Electrical ballast is a device intended to limit the amount of current in an electric circuit. Ballasts vary greatly in complexity. They can be as simple as a series resistor as commonly used with small neon lamps or light-emitting diodes (LEDs). For higher-power installations, too much energy would be wasted in a resistive ballast, so alternatives are used that depend upon the reactance of inductors, capacitors, or both. Finally, ballasts can be as complex as the computerized, remote-controlled electronic ballasts now often used with fluorescent lamps.
Common high-bay lighting structures of luminaires are typical in their design. This can be seen in Figure 1 of the accompanying drawings. In existing luminaires of

such kinds, ballast gets overheated as there is no special provision for heat dissipation. This leads to many customer complaints and high working failure rate.
Objects of the Invention:
An object of the invention is to provide an improved heat dissipating ballast.
Yet another object of the invention is to provide thermal heat reduction in luminaires, particularly, in high-bay luminaires with ballast.
Summary of the Invention:
According to this invention, there is provided a heat dissipating high-bay luminaire which comprises:
a. an annular disc plate adapted to co-operate with a top surface of a ballast
placed in the luminaire head section, said annular disc plate being of
designed dimensions such that there is maximum contact between said top
surface of said ballast and the underside of said plate for transference of heat
energy to said annular disc plate; and
b. securing means for securing the plate to a given eyebolt of the luminaire.
Typically, said annular disc plate is a metallic annular disc plate, suitably made of a metal selected for maximum heat absorption / transference.
Typically, said securing means is a metallic U-bracket.
Typically, said securing means includes, a nut fitted on the underside of said U-bracket, said nut adapted to receive and tighten grip on an inward extended portion (shaft) of an eyebolt projection out of the head section of said luminaire.

Brief Description of the Accompanying Drawings:
Figures 1 and 2 illustrate typical schematic drawings of a high-bay luminaire of the prior art; and
Figure 3 illustrates a mounting section of the high-bay luminaire of Figures 1 and 3.
The invention will now be described in relation to the accompanying drawings, in which:
Figure 4a illustrates a mechanical element insert adapted to be located in the luminaire for heat dissipation;
Figures 4b and 5 illustrate typical schematic drawings of a heat dissipating high-bay luminaire; and
Figure 6 illustrates a mounting section of the high-bay luminaire of Figures 4 and 5.
Detailed Description of the Accompanying Drawings:
Figures 1 and 2 illustrate typical schematic drawings of a high-bay luminaire of the prior art. Figure 3 illustrates a mounting section of the high-bay luminaire of Figures 1 and 3.
Reference numeral 200 refers to the luminaire body which houses the bulb and from where illumination occurs. Reference numeral 100 refers to the luminaire head and electrical ballast (12) of the high-bay luminaire. Ballast is fixed on gear

tray, which is fixed on the bosses on control gear cover. The ballast is a major source of heat generation in the control gear of this luminaire. Ballast top surface (14) is not having any contact with any surface. There is no mechanism for heat dissipation that occurs at the ballast. The heat generated in ballast is not dissipated efficiently. This may affect associated circuitry and components of the luminaire. So mainly in MH ballasts, failure complaints from customers are reported.
According to this invention, there is provided a heat dissipating high-bay luminaire (200, 300).
Figure 4a illustrates a mechanical element insert adapted to be located in the luminaire for heat dissipation.
Figures 4b and 5 illustrate typical schematic drawings of a heat dissipating high-bay luminaire.
In accordance with an embodiment of this invention, there is provided an annular disc plate (52) adapted to co-operate with the top surface (14) of the ballast (12) placed in the luminaire head section (300). The head section is also the mounting section. The annular disc plate (52) is of designed dimensions such that there is maximum contact between the top surface (14) of the ballast (12) and the underside of the plate (14) and that it is contained within the diameter of the head section at that position. The plate (14) is a metallic plate, suitable of a metal selected for maximum heat absorption / transference. This results in transfer of heat energy to the metal plate (14).
The head section (300) is the control gear cover for the luminaire.

In accordance with another embodiment of this invention, there is provided a securing means for securing the plate to a given eyebolt (16) of the luminaire. The securing means is a U-bracket (54) which is again metallic. Further, the U-bracket includes a nut (18) which receives an inward extended portion (shaft) (19) of the eyebolt (16). The nut provides support to the plate so that the plate is securely fixed in physical communication with the ballast. The nut can be operated between a tight and loose position in order to secure the disc.
When ballast of gear tray is fixed to control gear cover, then the ballast (12) top metal (14) portion presses the metallic circular disc (50). This improves heat dissipation of ballast surface and it highly reduces any chances of thermal failure.
While this detailed description has disclosed certain specific embodiments of the present invention for illustrative purposes, various modifications will be apparent to those skilled in the art which do not constitute departures from the spirit and scope of the invention as defined in the following claims, and it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

We claim,
1. A heat dissipating high-bay luminaire comprising:
a. an annular disc plate adapted to co-operate with a top surface of a ballast
placed in the luminaire head section, said annular disc plate being of
designed dimensions such that there is maximum contact between said top
surface of said ballast and the underside of said plate for transference of heat
energy to said annular disc plate; and
b. securing means for securing the plate to a given eyebolt of the luminaire.
2. A luminaire as claimed in claim 1 wherein, said annular disc plate is a metallic annular disc plate, suitably made of a metal selected for maximum heat absorption / transference.
3. A luminaire as claimed in claim 1 wherein, said securing means is a metallic U-bracket.
4. A luminaire as claimed in claim 1 wherein, said securing means includes , a nut fitted on the underside of said U-bracket, said nut adapted to receive and tighten grip on an inward extended portion (shaft) of an eyebolt projection out of the head section of said luminaire.