FORM 2
THE PATENTS ACT, 1970
(39 of l970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2005
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A device for checking leakage of mercury in a Dosing nozzle
APPLICANTS
Crompton Greaves Limited, CG House, 6th House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company.
INVENTOR
More Sachin Vasant of Crompton Greaves Ltd, Engineering Department, CG Global R&D Centre, Kanjur (E), 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 mechanical assemblies.
Particularly, this invention relates to a dosing vessel with a dosing nozzle.
More particularly, this invention relates to an apparatus for checking the working condition of a dosing nozzle.
Background of the Invention:
Dosing vessels are used to store liquids, and further have a dosing nozzle to dispense such liquid. Typically, a dosing vessel contains liquids which cannot be normally handled by a human, in that, it means that such liquids may be hazardous. Therefore, it is a necessity that the dosing vessel be leak-proof.
Even if the dosing vessel is leak-proof, the dosing nozzle which dispenses such content should also be leak-proof. This provides an efficient handling and dispensing mechanism. Dosing vessels may preferably be used in industrial applications, where large quantities of such liquid are required. In the industrial set-up, it is hence, more imperative that the leak-proof characteristic be emphasized.

One example where such a vessel is used is in manufacturing of luminaries. Luminaries' manufacturing companies need to check each and every dosing nozzle to evaluate its leak-proof quotient, for use in Fluorescence tube light manufacturing.
Objects of the Invention:
An object of the invention is to provide a device for checking a dosing nozzle of a dosing vessel.
Another object of the invention is to provide a device to evaluate the degree of leakage from a dozing nozzle of a dosing vessel.
Yet another object of the invention is to provide a device to evaluate the leakage of a dosing nozzle of a dosing vessel under vacuum conditions.
Still another object of the invention is to provide a device to evaluate the leakage of a dosing nozzle of a dosing vessel under variable vacuum conditions.
An additional object of the invention is to provide a device which provides a user of the device with a clearance value of a dosing nozzle of a dosing vessel.

Yet an additional object of the invention is to provide a device which efficiently checks the dosing nozzle of a dosing vessel.
Still an additional embodiment of the invention is to provide a device which is a simple construction to check the dosing nozzle of a dosing vessel.
Another additional embodiment of the invention is to provide an easy-fit device to check the dosing nozzle of a dosing vessel.
Summary of the Invention:
According to this invention, there is provided an apparatus for checking the working condition of a dosing nozzle having a dosing head and a dosing pin with a notch at its operative bottom end for holding Mercury, said apparatus comprises:
a. first lidded vessel, containing Mercury, adapted to receive said dosing nozzle
wherein said dosing head rests gripped by said lid of said first vessel, and
said dosing pin penetrates through said Mercury, thereby filling aid notch
with said Mercury, and extending thereto;
b. second dosing vessel, located operatively below said first vessel, said vessel
adapted to be vacuumised and further adapted to receive said extended dosing
pin with said filled notch from said first vessel; and

c. bushing between said first vessel and said second vessel adapted to firmly envelop said dosing pin extending out of said first vessel and into said second vessel, thereby disallowing seepage of Mercury from said first vessel to said second vessel if the dosing pin is in accordance with pre-defined dimensions of use.
Typically, a vacuum pump is connected to said second vessel for creating a vacuum in said second vessel.
Typically, a vacuum gauge is connected to said second vessel for measuring the amount of vacuum in said second vessel.
Typically, a third vessel is adapted to ensconce said second vessel for providing support during vacuumised stage of said second vessel.
Preferably, a third steel vessel is adapted to ensconce said second vessel for providing support during vacuumised stage of said second vessel.
Typically, said lid is a flanged lid with said flanges extending out from operative top of said first vessel.

Typically, fastening means are adapted to fasten said flange of said lid to said second vessel to provide support to said lid.
Typically, said apparatus includes O-rings adapted to seal said first vessel to said lid.
Brief Description of the Accompanying Drawings:
The invention will now be explained in relation to the accompanying drawings, in which:
Figure 1 illustrates a sectional view of the apparatus for checking dosing nozzle condition;
Figure 2 illustrates an exploded view of the apparatus of Figure 1; and
Figure 3 illustrates an operative view of the apparatus of Figure 1.

Detailed Description of the Accompanying Drawings:
According to this invention, there is provided an apparatus for checking the condition of a dosing nozzle, said dosing nozzle having a head section and a pin section. Typically, the dosing pin is susceptible to wear and tear due to continuous use, and may lead to minor aberrations in its external profile. Even minor aberrations in the profile may render the associated assembly (which use said dosing nozzle) useless or hazardous. Therefore, said apparatus is designed to check the working condition of the dosing nozzle in relation to its exterior profile by checking for leakage of Mercury using said Dosing nozzle, and said apparatus containing said dosing nozzle, under vacuum,.
Typically, the apparatus is adapted to check leakage of mercury through dosing vessel with dosing nozzle under variable vacuum. Particularly, the apparatus can help a user to arrive at clearance value which indicates that no leakage of mercury will take place through the dosing nozzle of the dosing vessel, thereby indicating that the condition of the dosing nozzle is acceptable for further use.
Figure 1 illustrates a sectional view of the apparatus for checking dosing nozzle condition in accordance with this invention; Figure 2 illustrates an exploded view of the apparatus of Figure 1; and Figure 3 illustrates an operative view of the apparatus of Figure 1.

According to this invention, there is provided an apparatus (100) for checking the working condition of a dosing nozzle having a dosing head (12) and a dosing pin (14) with a notch (16) at its operative bottom end for holding Mercury (18).
In accordance with an embodiment of this invention, there is provided a first lidded vessel (20), containing Mercury, adapted to receive said dosing nozzle wherein said dosing head rests gripped by said lid of said first vessel, and said dosing pin penetrates through said Mercury, thereby filling aid notch with said Mercury, and extending thereto..
In accordance with another embodiment of this invention, there is provided a second dosing vessel (22), located operatively below said first vessel, said vessel adapted to be vacuumised and further adapted to receive said extended dosing pin with said filled notch from said first vessel.
In accordance with yet another embodiment of this invention, there is provided a bushing (24) between said first vessel and said second vessel adapted to firmly envelop said dosing pin extending out of said first vessel and into said second vessel, thereby disallowing seepage of Mercury from said first vessel to said second vessel if the dosing pin is in accordance with pre-defined dimensions of use.

In accordance with still another embodiment of this invention, there is provided a metal vessel (26), preferably a metal cylinder with said second vessel (a concentric collection bin) ensconced within it. Typically, the metal vessel is recessed from its operative top side to for a step, which step opens into the ensconced collection bin. Thus, in its non-used condition, the bin is exposed to air, through the recessed step portion at the top of the metal vessel. Preferably, said metal vessel is a steel vessel.
This setup is plug and play type.
A dosing vessel (first vessel) with dosing nozzle is filled with mercury having pre-determined quantity. This vessel is introduced to sit on said recessed step of said metal block, such that is fits into the step.
In accordance with another embodiment of this invention, said pin is adapted to pass through the dosing vessel and through the bushings and collinearly placed bin below. The bushing is provided to encircle the pin at the gap between the opening of the dosing vessel and the bin.
In accordance with yet another embodiment of this invention, there is provided a lid (28) adapted to be seated atop said dosing vessel i.e. at the extreme operative upper end of said device. The lid is fixed.

In accordance with still another embodiment of this invention, Fixing means (30) such as fasteners are used to secure to said lid to said metal vessel. Said lid is spaced apart from said metal vessel. The fasteners run along the length of said dosing vessel.
In accordance with yet another embodiment of this invention, a vacuum pump (32) is connected to said second vessel (collection bin), in order to create a vacuum in said collection bin.
in accordance with still another embodiment of this invention, there is provided a vacuum gauge (34) to provide variable vacuum levels, by means of said vacuum pump.
In accordance with an additional embodiment of this invention, said apparatus includes O-rings (36) adapted to seal said first vessel to said lid.
Under the action of vacuum, Mercury is sucked through the bush and pin clearances. The amount that leaks, flows into the collection bin. This amount is proportional to clearance and vacuum, thus providing a measure of the leakage quotient of the dosing nozzle of dosing vessel.

We claim,
1. An apparatus for checking the working condition of a dosing nozzle having a dosing head and a dosing pin with a notch at its operative bottom end for holding Mercury, said apparatus comprising:
a. first lidded vessel, containing Mercury, adapted to receive said dosing
nozzle wherein said dosing head rests gripped by said lid of said first
vessel, and said dosing pin penetrates through said Mercury, thereby
filling aid notch with said Mercury, and extending thereto;
b. second dosing vessel, located operatively below said first vessel, said
vessel adapted to be vacuumised and further adapted to receive said
extended dosing pin with said filled notch from said first vessel; and
c. bushing between said first vessel and said second vessel adapted to
Firmly envelop said dosing pin extending out of said first vessel and into
said second vessel, thereby disallowing seepage of Mercury from said
first vessel to said second vessel if the dosing pin is in accordance with
pre-defined dimensions of use.
2. An apparatus as claimed in claim 1 wherein, a vacuum pump is connected to said second vessel for creating a vacuum in said second vessel.

3. An apparatus as claimed in claim 1 wherein, a vacuum gauge is connected to said second vessel for measuring the amount of vacuum in said second vessel.
4. An apparatus as claimed in claim 1 wherein, a third vessel is adapted to ensconce said second vessel for providing support during vacuumised stage of said second vessel.
5. An apparatus as claimed in claim 1 wherein, a third steel vessel is adapted to ensconce said second vessel for providing support during vacuumised stage of said second vessel.
6. An apparatus as claimed in claim 1 wherein, said lid is an flanged lid with said flanges extending out from operative top of said first vessel.
7. An apparatus as claimed in claim 1 wherein, fastening means are adapted to fasten said flange of said lid to said second vessel to provide support to said lid.

8, An apparatus as claimed in claim 1 wherein, said apparatus includes O-rings adapted to seal said first vessel to said lid.