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
An improved 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 luminaire, along with IP rating increment and a maintenance friendly lighting luminaire.
More particularly, this invention relates to an improved 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 control gear box, 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.

There are disadvantages of the high-bay luminaires of the prior art, the disadvantages being:
1) Ingres Protection (IP) Problem.
2) Thermal Problem.
3) Not much maintenance friendly at the time of taking out gear tray.
There is a need for an improved high-bay luminaire which obviates the limitations of the prior art.
Objects of the Invention:
An object of the invention is to provide an improved luminaire with an improved heat dissipating control gear.
Another object of the invention is to provide thermal heat reduction in luminaires, particularly, in high-bay luminaires with ballast.
Yet another object of the invention is to provide relatively better IP (Ingress Protection) rating for more protection against water and dust, in high-bay luminaires.
Still another object of the invention is to provide a maintenance friendly high-bay luminaire.
Summary of the Invention:
According to this invention, there is provided an improved high-bay luminaire which comprises:
a) luminaire body (reflector) which houses a bulb from where illumination occurs; and
b) luminaire head (control gear housing) including electrical ballast, said ballast being fixed on a gear tray;

characterised in that, there are provided a plurality of equi-angularly located, radially dispersed, toggles about said luminaire head in order to latch said luminaire head over said luminaire body wherein said equi-angularly dispersed toggles provide uniform latching and pressure onto said luminaire body, thereby providing relatively higher IP rating.
Typically, said luminaire comprises a plurality of radially dispersed, equi-angularly located bosses in the casting of said luminaire head for fixing said toggles.
Typically, said luminaire comprises bosses for fixing a toggle clamp to said luminaire head, thus avoiding any through hole in casting and ultimately avoiding any water or dust entry chance, thereby providing high ingress protection (IP protection).
Typically, said luminaire is provided with an enclosed operative top portion of said luminaire head, in that, the eyebolt through hole (for fixing the luminaire) is removed and converted to a blind hole. Thus failure chance of IP from the through hole becomes zero. Further there is provided a tightening screw for safety of eyebolt.
Typically, said luminaire control gear bottom part includes a grooved rim about said luminaire head, said grooved rim being adapted for fixing a tubular gasket.
Typically, said luminaire control gear upper part includes a slight and roughly triangular shaped projection for tightly pressing a gasket for complete sealing.
Typically, said luminaire head includes a hinging pin and hinging boss with so that the hinge may not hinder the pressure of said toggles, thereby maintaining uniform distribution of pressure.
Typically, said luminaire head includes a circumferential rim projection operatively downwards from said luminaire (control gear) and adapted to circumferentially envelope mating portion of said luminaire head (control gear) with said luminaire body (reflector).

Typically, said luminaire head includes a plurality of radially extending fins on the exterior operative top portion of said luminaire head, thereby providing a relatively larger surface area for heat dissipation.
Typically, said luminaire head is a flat top surfaced luminaire head, in that, the operative
top surface is flattened so as to allow maximum contact of its inner underside with said
ballast provided in said luminaire head for relatively higher heat dissipation.
Typically, said luminaire head includes control gear tray fixing bosses that are shifted
slightly to the centre to accommodate the eyeslot shifting of gear tray.
Typically, said luminaire head includes eyeslots provided in said gear tray for ease of
removal.
Brief Description of the Accompanying Drawings:
Figure 1 illustrates a typical schematic drawing of a high-bay luminaire of the prior art.
The invention will now be described in relation to the accompanying drawings, in which:
Figure 2 illustrates a front view schematic of an improved high-bay luminaire;
Figure 3 illustrates a top view of the improved high-bay luminaire;
Figure 4 illustrates a close view showing the bosses for fixing toggles in casting of Control Gear of the improved highbay luminaire;
Figure 5 illustrates a schematic cross section of the luminaire head of the improved high-bay luminaire;
Figure 6 illustrates an inside view of the luminaire head of the improved high-bay luminaire;

Figure 7 illustrates a schematic cut view of an inverted luminaire head;
Figure 8 illustrates hinging boss of luminaire head;
Figures 9 and 10 illustrate a mating portion of the luminaire Control Gear with the
luminaire reflector;
Figure 11 illustrates an underside view of the luminaire Control Gear Casting top part -showing the rib of roughly triangular cross-section (this rib is for pressing the mating gasket of lower part of Control Gear);
Figure 12 illustrates a top view of the luminaire head (Flat top surface of Control Gear Casting, with fins is visible);
Figure 13 illustrates a cross-sectional view showing ballast top surface in contact with flat top surface of luminaire head;
Figures 14 illustrate an internal view showing flat top surface of luminaire head;
Figures 15 illustrate the new position of bosses for mounting the Control Gear Tray; and
Figure 16 illustrates an internal view of the luminaire head with gear tray fitted in it.
Detailed Description of the Accompanying Drawings:
Figure 1 illustrates a typical schematic drawing of a high-bay luminaire of the prior art.
Reference numeral 200 refers to the luminaire body (also called the reflector) which houses the bulb and from where illumination occurs. Reference numeral 100 refers to the luminaire head (also called the control gear housing) and electrical ballast (12) of the high-bay luminaire. Ballast was fixed on gear tray, which was fixed on the bosses on control gear cover. The ballast was a major source of heat generation in this control gear

housing. Ballast top surface (14) was not having any contact with any surface due to hemispherical shape of the operative top portion of the luminaire head. There was no mechanism for heat dissipation that occurs at the ballast. The heat generated in ballast was not dissipated efficiently. This may affect associated circuitry and components of the luminaire. So mainly in MH ballasts, failure complaints from customers are reported.
Furthermore, there was provided a pin fix hinging arrangement. Only one toggle was provided to latch the luminaire body (200) with the luminaire head (100). Hinging was through a fixed pin between the casting housing and cover part, thereby providing no play. There was a flat gasket which was fixed to the bottom part of luminaire control gear (100) (at the mating portion of luminaire control gear and luminaire reflector).
According to this invention, there is provided an improved high-bay luminaire (200, 300).
Figure 2 illustrates a schematic front view of the improved high bay luminaire.
In accordance with an embodiment of this invention, there is provided an improved luminaire head (also called the control gear housing) as referenced by numeral 300 in the accompanying drawings. The luminaire body (also called the reflector) as reference by numeral 200 is similar to the luminaire body of the prior art.
Figure 3 illustrates a top view of the improved high-bay luminaire (showing fins provided for better heat dissipation).
In accordance with another embodiment of this invention, there are provided a plurality of equi-angularly located, radially dispersed, toggles (22) about said luminaire head in order to latch the luminaire head over the luminaire body. These equi-angularly dispersed toggles provide uniform latching and pressure onto the luminaire body, thereby providing relatively higher IP rating.
In the prior art, toggle clamps were fitted to lower part of control housing by riveting.

In the improved high-bay luminaire, there are provided a plurality of radially dispersed, equi-angularly located bosses (24) in the casting of the luminaire head for fixing the toggles. Figure 4 illustrates a close view showing the bosses for fixing toggles in casting of Control Gear of the improved highbay luminaire. These bosses are proposed for fixing the toggle clamp to the control gear, thus avoiding any through hole in casting and ultimately avoiding any water or dust entry chance, thereby providing high ingress protection (IP protection).
Figure 5 illustrates a schematic cross section of the luminaire head of the improved high-bay luminaire (showing the upper flat surface for direct contact with the upper ballast surface for faster heat dissipation from ballast. It also shows blind hole for eyebolt with safety screw for eyebolt) and Figure 6 illustrates an inside view of the luminaire head of the improved high-bay luminaire (showing top flat surface - inside view, of control gear top cover).
In accordance with yet another embodiment of this invention, there is provided an enclosed operative top portion of the luminaire head, in that, the eyebolt through hole (for fixing the luminaire) is removed and converted to a blind hole (26). There is a tightening screw for safety of eyebolt so that it does not get loosened.
Figure 7 illustrates a schematic cut view of an inverted luminaire head (showing the gasket fixing groove in the Control Gear Housing - bottom part).
In accordance with still another embodiment of this invention, there is provided a grooved rim (26) about the luminaire head. This grooved rim in the control gear lower housing is for fixing a tubular EPDM gasket. While in the above matching part of control gear cover, a slight and roughly triangular shaped projection is given for tightly pressing the gasket.
Figure 8 illustrates hinging boss of luminaire head. The possible play in the hinge can be easily visualized because of slightly more length of slot in the hinging boss.

In accordance with an additional embodiment of this invention, there is provided a hinging boss (28) and pin in order to provide play to the luminaire head so that the hinge may not hinder the pressure of toggles, thereby maintaining the uniform distribution of pressure.
Figures 9 and 10 illustrate a mating portion of the luminaire Control Gear with the luminaire reflector. It clearly shows that the top portion of reflector neck is covered for better IP protection.
In accordance with yet an additional embodiment of this invention, there is provided a circumferential rim (30) projection operatively downwards from said luminaire head and adapted to circumferentially envelope mating portion of luminaire head (control gear) with luminaire body (reflector). The circumferential rib is typically a circumferential strip projected from the luminaire head edge.
Figure 11 illustrates an underside view of the luminaire Control Gear Casting top part -showing the rib of roughly triangular cross-section (this rib is for pressing the mating gasket of lower part of Control Gear).
In accordance with still an additional embodiment of this invention, there is provided a circumferential rib (32) in the casting of control gear cover for pressing the tubular gasket for complete sealing.
Figure 12 illustrates a top view of the luminaire head.
In accordance with another additional embodiment of this invention, there are provided radially extending fins (34) on the exterior operative top portion of luminaire head. The radially extending fins provide a larger surface area for heat dissipation.
In accordance with yet another additional embodiment of this invention, there is provided a flat top surfaced (36) luminaire head, in that, the operative top surface is flattened so as

to allow maximum contact of its inner underside with a ballast (12) provided in the luminaire head. The ballast heats up and with maximum contact, heat transfer from the ballast to the luminaire body and subsequently to the fins occurs in an efficient manner. As a result, the ballast failure problem due to temperature rise decreases a lot. Figure 13 illustrates a cross-sectional view showing ballast top surface in contact with flat top surface of luminaire head. Figures 14 illustrate an internal view showing flat top surface of luminaire head.
Figure 15 illustrate the changed bosses position where the bosses are for fixing the control gear tray.
The bosses (36) are shifted slightly to the centre to accommodate the eyeslot shifting of gear tray (21). There are eyeslots (38) provided in gear tray (21) in order to make it maintenance friendly.
Figure 16 illustrates an internal view of the luminaire head with gear tray fitted in it.
This makes it possible to take out the gear tray (21) by just loosening the screws, then slightly moving the gear tray to take it out. There is no need to open the screws. This makes it maintenance friendly.
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. An improved high-bay luminaire comprising:
a) luminaire body (reflector) which houses a bulb from where illumination occurs; and
b) luminaire head (control gear housing) including electrical ballast, said ballast being fixed on a gear tray;
characterised in that, there are provided a plurality of equi-angularly located, radially dispersed, toggles about said luminaire head in order to latch said luminaire head over said luminaire body wherein said equi-angularly dispersed toggles provide uniform latching and pressure onto said luminaire body, thereby providing relatively higher IP rating.
2. An improved high-bay luminaire as claimed in claim 1 wherein, said luminaire comprises a plurality of radially dispersed, equi-angularly located bosses in the casting of said luminaire head for fixing said toggles.
3. An improved high-bay luminaire as claimed in claim 1 wherein, said luminaire comprises bosses for fixing a toggle clamp to said luminaire head, thus avoiding any through hole in casting and ultimately avoiding any water or dust entry chance, thereby providing high ingress protection (IP protection).
4. An improved high-bay luminaire as claimed in claim 1 wherein, said luminaire is provided with an enclosed operative top portion of said luminaire head, in that, the eyebolt through hole (for fixing the luminaire) is removed and converted to a blind hole and further provided with a tightening screw for safety of eyebolt.
5. An improved high-bay luminaire as claimed in claim 1 wherein, said luminaire control gear bottom part includes a grooved rim about said luminaire head, said grooved rim being adapted for fixing a tubular gasket.

6. An improved high-bay luminaire as claimed in claim 1 wherein, said luminaire control gear upper part includes a slight and roughly triangular shaped projection for tightly pressing a gasket.
7. An improved high-bay luminaire as claimed in claim 1 wherein, said luminaire head includes a hinging boss and hinging pin in order to provide play to said luminaire head so that the hinge may not hinder the pressure of said toggles, thereby maintaining uniform distribution of pressure.
8. An improved high-bay luminaire as claimed in claim 1 wherein, said luminaire head includes a circumferential rim projection operatively downwards from said luminaire head (control gear) and adapted to circumferentially envelope mating portion of said luminaire head (control gear) with said luminaire body (reflector).
9. An improved high-bay luminaire as claimed in claim 1 wherein, said luminaire head includes a circumferential rib in the casting of said luminaire head for pressing a tubular gasket for complete sealing.
10. An improved high-bay luminaire as claimed in claim 1 wherein, said luminaire head includes a plurality of radially extending fins on the exterior operative top portion of said luminaire head, thereby providing a relatively larger surface area for heat dissipation.
11. An improved high-bay luminaire as claimed in claim 1 wherein, said luminaire head is a flat top surfaced luminaire head, in that, the operative top surface is flattened so as to allow maximum contact of its inner underside with said ballast provided in said luminaire head for relatively higher heat dissipation.

12, An improved high-bay luminaire as claimed in claim 1 wherein, said luminaire head
includes control gear tray fixing bosses that are shifted slightly to the centre to
accommodate the eyeslot shifting of gear tray.
13. An improved high-bay luminaire as claimed in claim 1 wherein, said luminaire head
includes eyeslots provided in said gear tray for ease of removal.