FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION (See section 10 and rule 13)

1. TITLE OF THE INVENTION:
"Air Venting Mechanism for Radiator Coolant Recovery Bottle"
2. APPLICANT:
(a) NAME: TATA TOYO Radiator Ltd
(b) NATIONALITY: Indian Company registered under
the provisions of the Companies Act, 1956
(c) ADDRESS: Survey No. 235/245, Hinjewadi,
Taluka - Mulshi, Pune-411027
3. PREAMBLE TO THE DESCRIPTION:
PROVISIONAL COMPLETE
The following specification describes the The following specification
invention. particularly describes the invention and
the manner in which it is to be
performed.

Air Venting Mechanism for Radiator Coolant Recovery Bottle
Field of invention
The present invention relates to an engine cooling system of internal combustion engines. More particularly, the present invention relates to an air venting mechanism for a radiator coolant from a radiator coolant recovery bottle to prevent the loss of coolant during engine operation.
Background of the invention
Internal combustion (IC) engine requires a cooling system to maintain the temperature of the engine jacket. The cooling system consists of engine jacket, hoses, radiator, de-aeration tank and pressure cap. Radiator is an assembly of tubes, between two tanks, carry the liquid to be cooled. Extended surfaces on the outer side of tubes, known as fins, together air flow drawn over the assembly enhances the rate of transfer of heat to a considerable extent.
One of the factors which reduce the efficiency of the radiator, by adversely affecting the engine coolant flow, is the loss of coolant during engine operation. The main reason is the loss of coolant during the operation of a pressure relief valve. The radiator is designed to work within a specified pressure rating. When the system pressure exceeds a limiting value, the pressure relief valve opens, thereby relieving the excess pressure. This operation relieves the excess pressure in the system, but some amount of coolant is also lost in the process. This coolant is collected in the container usually called a coolant recovery bottle. The coolant recovery bottle is connected to the coolant system through a vent which is connected at the pressure cap relief valve. The hot coolant is collected in the recovery bottle and it tries escapes in the form of vapour from the bottle, through the bottle cap.

In the present available designs of the coolant recovery bottle, coolant spillage from the vent is a common problem. The leakages occurred at the cap portion. The existing caps designed are press fit type and are either very tightly or very loosely fit into the bottle for various models, the reason being improper sealing of the cap resulting in leakage of coolant.
Disadvantages of the prior art
• There is no proper venting mechanism for the coolant. The coolant spillage occurs due to easy path for coolant escape through neck portion due to improper fitment of the cap on the bottle.
• Coolant escape occurs through a vent opening due to simple venting mechanism.
• The existing sealing between the recovery bottle and the cap is inadequate.
Objects of the invention
An object of the present invention is to provide an air venting mechanism for a radiator coolant recovery bottle which allows only air and coolant vapour to escape and prevent escape of liquid coolant through vent tube;
Another object of the present invention is to provide an air venting mechanism for a radiator coolant recovery bottle which makes the recovery bottle and a cap leak proof by proper fitment mechanism;
Yet another object of the present invention is to provide an air venting mechanism for a radiator coolant recovery bottle which results in reduced maintenance costs at user end.

Summary of the invention
Accordingly, the present invention provides an air venting mechanism for a radiator coolant recovery bottle, the air venting mechanism comprising;
a cap having threading provided on inner wall thereof for securing to a neck of the radiator recovery bottle, the cap having a vent opening thereon;
a rubber gasket having a hemispherical shape for providing a sealing of the cap with the neck of the radiator coolant recovery bottle, the rubber gasket having an aperture in a center portion thereof, wherein the vent opening on the inner side of the cap is offset from the aperture of the rubber gasket thereby preventing escape of liquid coolant through the vent opening; and
a plastic tag with a ring secured to the cap for avoiding the cap loss from the radiator coolant recovery bottle.
Typically, wherein the cap and the plastic tag is produced through a blow moulding process.
Typically, wherein the rubber gasket is manufactured by a vulcanization process.
Brief description of the drawings
Figure I shows an air venting cap of the prior art;
Figure 2 shows a sectional view of an air venting mechanism for a radiator coolant recovery bottle in accordance with the present invention;
Figure 3 shows the schematic isometric representation of the air venting mechanism for a radiator coolant recovery bottle of figure 1, in accordance with the present invention;

Figure 4a and 4b shows the coolant recovery bottle mounted on a typical Engine Cooling System; and
Figure 5 shows functional block diagram of Engine cooling of IC engines.
Description of invention
The foregoing objects of the present invention are accomplished and the problems and shortcomings associated with the prior art, techniques and approaches are overcome by the present invention as described below in the preferred embodiment.
Accordingly, the present invention provides an air venting mechanism for a radiator coolant recovery bottle. The air venting mechanism allows only air and coolant vapour to escape and prevent escape of liquid coolant through a vent tube. Further, the mechanism makes the coolant recovery bottle and a cap leak proof by proper fitment mechanism. Further, air venting mechanism results in reduced maintenance costs at user end.
This present invention is illustrated with reference to the accompanying drawings, throughout which reference numbers indicate corresponding parts in the various figures. These reference numbers are shown in bracket in the following description.
Referring now to figure 2 and 3, there is shown an air venting mechanism for a radiator coolant recovery bottle in accordance with the present invention. Specifically, figure 2 and 3 shows the air venting mechanism (100) (hereinafter referred to as the "mechanism") for the radiator coolant recovery bottle. The mechanism (100) includes a cap (10), a rubber gasket (20) and a plastic tag (30).

The cap (10) has threading provided on inner wall thereof for securing to a neck of the radiator coolant recovery bottle (not shown). Further, the cap (10) has a vent opening (12) thereon for air and coolant vapor to escape from the radiator coolant recovery bottle. In an embodiment, the cap (10) is made of high density polyethylene. However, it may be evident to those skilled in the art to use other suitable polymer for the cap (10). Furthermore, the threading provided on the inner side of the cap (10) holds the rubber gasket (20) therein and presses the rubber gasket (20) against the neck of the recovery bottle thereby making the coolant recovery bottle leak proof.
The rubber gasket (20) provides the sealing of the cap (10) with the neck of the radiator coolant recovery bottle. Further, the rubber gasket (20) has an aperture (22) in a centre portion thereof. In an embodiment, the rubber gasket (20) is made from EPDM (Ethylene Propylene Di-ene Monomer (M-class)) rubber. However, it may be evident to those skilled in the art to use other suitable polymer for the rubber gasket (20). Further, in an embodiment, the rubber gasket (20) is manufactured by a vulcanization process. However, it may be evident to those skilled in the art to use any other suitable process for manufacturing of the rubber gasket (20).
Specifically, the vent opening (12) of the cap (10) is offset from the aperture (22) of the rubber gasket (20). More specifically, the non-axial position of the vent opening (12) with the aperture (22) prevents escape of liquid coolant through the vent opening (12).
Further, the plastic tag with a ring (30) is secured to the cap (10) for avoiding the cap (10) loss from the radiator coolant recovery bottle during refilling. The plastic tag (30) is made of unfilled polypropylene. In an embodiment, the cap (10) and the plastic tag (30) are produced by a blow molding process. However, it may be evident to those skilled in the art to use any other suitable method for producing the cap (10) and the plastic tag (30).

Referring now to figure 4a and 4b, there is shown the coolant recovery bottle mounted on a typical Engine cooling system, in accordance with the present invention. Specifically, the figure 4a and 4b shows engine cooling system (200) having a coolant recovery bottle (120) mounted thereon
Further, figure 5 shows functional block diagram of Engine cooling of IC engines (300) having the coolant recovery bottle (120) with the air venting mechanism (100) mounted thereon.
Advantages of the invention
1. The mechanism solves the coolant spillage problem by use of the cap in accordance with the present invention.
2. The coolant vapor and air vent is provided along with protection from coolant spillage.
3. Frequency of coolant replenishment is signiticantly reduced.
4. Proper sealing at the neck is assured with the of rubber gasket.

We Claim
1. An air venting mechanism for a radiator coolant recovery bottle,
the air venting mechanism comprising;
a cap having threading provided on inner wall thereof for securing to a neck of the radiator recovery bottle, the cap having a vent opening thereon;
a rubber gasket providing a sealing of the cap with the neck of the radiator coolant recovery bottle, the rubber gasket having an aperture in a center portion thereof, wherein the vent opening on the inner side of the cap is offset from the aperture of the rubber gasket thereby preventing escape of liquid coolant through the vent opening; and
a plastic tag with a ring secured to the cap for avoiding the cap loss from the radiator coolant recovery bottle.
2. The air venting mechanism of claim 1, wherein the cap and the plastic tag is produced through a blow molding process.
3. The air venting mechanism of claim 1, wherein the rubber gasket is manufactured by a vulcanization process.