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 mechanism for aiding phosphating of tanks or vessels.
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
Mehta Mohit of Crompton Greaves Limited, Appliance Division, Kanjur Marg (East), Mumbai, 400 042 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 performed.

FIELD OF THE INVENTION:
This invention relates to the field of electro-mechanical assemblies.
Particularly, this invention relates to a mechanism for aiding phosphating of tanks or
vessels.
BACKGROUND OF THE INVENTION:
Phosphate coatings are used on steel parts for corrosion resistance, lubricity, or as a foundation for subsequent coatings or painting. It serves as a conversion coating in which a dilute solution of phosphoric acid and phosphate salts is applied via spraying or immersion and chemically reacts with the surface of the part being coated to form a layer of insoluble, crystalline phosphates. Phosphate conversion coatings can also be used on aluminium, zinc, cadmium, silver and tin.
The main types of phosphate coatings are manganese, iron and zinc. Manganese phosphates are used both for corrosion resistance and lubricity and are applied only by immersion. Iron phosphates are typically used as a base for further coatings or painting and are applied by immersion or by spraying. Zinc phosphates are used for rust proofing (P&O), a lubricant base layer, and as a paint/coating base and can also be applied by immersion or spraying
One of the assemblies that need phosphating is a domestic water heater tank.
According to the prior art, handling of tanks was a big issue, as weight of a tank ranged from about 10-12 kgs. When this tank is dipped in a bath, the weight of the tanks including the water or chemical in which it is dipped or immersed gets

doubled. Hence, it is not viable to load and unload the tank without a fixture of in a manual manner.
Also, it is impossible to dip or immerse or load or unload multiple tanks simultaneously.
Coating is required on both surfaces i.e. inside and outside of the tank; so chemical exposure is required on both surfaces. After particular time, when processing is over in each tank, the chemical has to be flushed out.
Hence, there is a requirement for a mechanism or a fixture which is able to withstand the up thrust generated during dipping.
OBJECTS OF THE INVENTION:
An object of the invention is to provide a mechanism or a fixture for aiding phosphating of tanks or vessels.
Another object of the invention is to provide a mechanism or a fixture which is able to withstand up thrust generated during its dipping in a liquid phosphating bath.
SUMMARY OF THE INVENTION:
According to this invention, there is provided a mechanism for aiding phosphating of at least a second tank, inside a first tank having a liquid bath,with phosphating liquid, said mechanism comprises:
an external frame adapted to hold a jig, said jig adapted to hold at least a second tank hanging operatively downward from said jig, said at least a second tank being angularly displaceable about said jig with the help of said

jig, said angular tank further being adapted to be lowered in said liquid bath and further adapted to be angularly displaced in said liquid bath, said angular displacement being adapted to occur at a point of time when force is approximately equal to the weight of said external frame.
Typically, said external frame further comprises a mesh on the operative bottom surface.
Typically, said jig comprises:
an operative horizontal top bar with a plurality of operative vertical arms hanging operatively downwards from said horizontal top bar with said operative vertical arms being adapted to hold said at least a second tank.
Typically, said jig comprises:
an operative horizontal top bar with a plurality of operative vertical arms hanging operatively downwards from said horizontal top bar with said operative vertical arms being adapted to hold said at least a second tank, said jig further comprising a V-shaped frame / grill adapted to hold said operative horizontal top bar.
Typically, said vertical bars are spaced apart with respect to each other.
Typically, said jig is hinged with a rack and pinion arrangement adapted to angularly displace said at least a second tank.

Typically, said jig comprises:
an operative horizontal top bar with a plurality of operative vertical arms hanging operatively downwards from said horizontal top bar with said operative vertical arms being adapted to hold said at least a second tank, said horizontal bar being adapted to be operatively lowered or raised in said first tank.
Typically, said at least a second tank comprises inlet - outlet pipes facing in an operative downward direction.
Typically, said at least a second tank is loaded on said jig mechanism in an operatively inverted position.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
The invention will now be described in relation to the accompanying drawings, in which:
Figure 1 illustrates a schematic of the mechanism for aiding phosphating of second tanks along with the second tanks.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
According to this invention, there is provided a mechanism or a fixture for aiding phosphating of tanks or vessels.
Figure 1 illustrates a schematic of the mechanism for aiding phosphating of second tanks along with the second tanks.

In accordance with an embodiment of this invention, there is provided a first tank (12) which contains a liquid bath or a liquid solution. The liquid bath or the liquid solution can be a phosphating liquid.
In accordance with another embodiment of this invention, there is provided an external frame which holds a jig. Typically, the jig holds a plurality of second tanks (10) hanging operatively downward from the jig. These second tanks (10), typically, are water heater tanks. The second tanks (10) are spaced apart with respect to each other. Each of the second tanks (10) is adapted to be angularly displaceable about the jig and with the help of the jig. Typically, the external frame is of mild steel. This external frame comprises a mesh (14) on the operative bottom side and a-plurality of operative vertical arms (16) on an operative horizontal bar (18); each of said arms being adapted to hold on to the tanks or vessels, respectively.
In accordance with another embodiment of this invention, the jig comprises the operative horizontal bar (18) and a plurality of operative vertical arms (16) on the operative horizontal bar (18); each of said arms (16) being adapted to hold on to the second tanks (10) or vessels, respectively. Typically, the jig is a V-shaped frame/grill on top (22). The jig is hinged with a rack and pinion arrangement (24) which can move the horizontal bar (18) about 360 degre'es (angular displacement). The horizontal bar (18) is adapted to be operatively lowered or raised in the first tank (12) having the liquid bath which provides for phosphating of the second tanks (10) or vessels connected to the vertical arms (16).
According to a preferred embodiment, an overhead crane (26) may be used to operate the mechanism (for aiding phosphating) - lowering into and raising out of the liquid bath.

The weight of the displaced fluid is directly proportional to the volume of the displaced fluid (if the surrounding fluid is of uniform density). In simple terms, the principle states that the buoyant force on an object is going to be equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational constant, g. Thus, among completely submerged objects with equal masses, objects with greater volume have greater buoyancy. (Archimedes Principle)
The second tanks (10), typically, are mild steel tanks. Mild steel tanks may rest on the bottom mesh (14) with inlet - outlet pipes facing in an operative downward direction. In a preferred exemplary embodiment, the horizontal bar (18) comprises about 9 to 10 sets of vertical arms, and hence, 9 to 10 corresponding tanks can be loaded one at a time. When the whole mechanism is dipped in the liquid (chemical or water or phosphating) bath with help of an over head crane (26), an up thrust force will be applied on to the external frame, at one point of time when force will be approximately equal to the weight of the external frame, at that time the hinge will operate and will angularly displace the horizontal bar (18) by about 180 degrees with help of rack and pinion mechanism. At this time, the pipes will come in an operative upward direction due to which the chemical/water will enter in the second tanks. The whole arrangement will be kept inside the chemical for desired time.
When the mechanism is to be lifted, the same principle will be used in reverse direction which means the chemical/water will get drained.
Typically, the second tanks (10) are loaded on the mechanism in an operatively inverted position

The second tanks (10) will turn upside down to fill up with the chemical / water as per the stage. While taking out liquid from the second tank (10), the fixture will turn back to the original position with the second tank opening at its operative bottom in order to empty the chemical / water inside the first tank (12).
The mechanism of this invention provides safety. Also, handling is very easy as one operator can handles about 9-10 tanks mounted on the mechanism. Hence, there is productivity enhancement.
The technical advancement of this invention lies in provisioning a mechanism for phosphating, which mechanism is envisaged to handle multiple tanks or vessels for being immersed in a liquid bath and being raised out of the liquid bath and wherein the mechanism is able to withstand the up thrust generated during dipping. Further technical advancement lies in angularly displacing the second tanks at a crucial or pre-determined point in time in order to provide ease of filling of liquid in the second tanks.
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 mechanism for aiding phosphating of at least a second tank, inside a first
tank having a liquid bath, with phosphating liquid, said mechanism
comprising:
an external frame adapted to hold a jig, said jig adapted to hold at least a second tank hanging operatively downward from said jig, said at least a second tank being angularly displaceable about said jig with the help of said jig, said angular tank further being adapted to be lowered in said liquid bath and further adapted to be angularly displaced in said liquid bath, said angular displacement being adapted to occur at a point of time when force is approximately equal to the weight of said external frame.
2. The mechanism as claimed in claim 1, wherein said external frame further comprising a mesh on the operative bottom surface.
3. The mechanism as claimed in claim 1, wherein said jig comprising:
an operative horizontal top bar with a plurality of operative vertical arms hanging operatively downwards from said horizontal top bar with said operative vertical arms being adapted to hold said at least a second tank.
4. The mechanism as claimed in claim 1, wherein said jig comprising:
an operative horizontal top bar with a plurality of operative vertical arms hanging operatively downwards from said horizontal top bar with said operative vertical arms being adapted to hold said at least a second

tank, said jig further comprising a V-shaped frame / grill adapted to hold said operative horizontal top bar.
5. The mechanism as claimed in claim 1, wherein said vertical bars are spaced apart with respect to each other.
6. The mechanism as claimed in claim 1, wherein said jig being hinged with a rack and pinion arrangement adapted to angularly displace said at least a second tank.
7. The mechanism as claimed in claim 1, wherein said jig comprising:
an operative horizontal top bar with a plurality of operative vertical arms hanging operatively downwards from said horizontal top bar with said operative vertical arms being adapted to hold said at least a second tank, said horizontal bar being adapted to be operatively lowered or raised in said first tank.
8. The mechanism as claimed in claim 1, wherein said at least a second tank comprising inlet - outlet pipes facing in an operative downward direction.
9. The mechanism as claimed in claim 1, wherein said at least a second tank is loaded on said jig mechanism in an operatively inverted position.