FORM 2
THE PATENT ACT, 1970
(39 of 1970)
&
THE PATENTES RULES, 2005
COMPLETE SPECIFICATION (See section 10, rule 13)
1. TITLE OF THE INVENTION
"Water Drain Bracket Assembly for Plenum Chamber in Automobiles"
2. APPLICANT(S)
(a) Name : MAHINDRA & MAHiNDRA LIMITED
(b) Nationality : Indian Company registered under the provisions
of the Companies Act, 1956
(c) Address : R&D Center, Automotive Sector,
89, M.I.D.C., Satpur, NASHIK - 422 007 Maharashtra State, India
3. PREAMBLE OF THE DESCRIPTION
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.

Field of Invention
The present invention relates to drain valve constructions in automobiles, and more particularly, the present invention relates to a drain bracket assembly for draining water inside a plenum chamber of the automobile.
Background of the present invention
In automobiles, a plenum chamber is a chamber located in front of a windshield, where air pressure is above atmospheric level. The plenum chamber is a rearmost area under the hood. The plenum chamber provides a volume of fresh air which is drawn into the car from a chamber through heater, air-conditioner or vents. Early day cars had a vent in front of the windshield and this could be opened by a lever in the cabin to allow air into the cabin. Later cars with the plenum chamber had a grille, which was the opening to the chamber.
However, if the area of plenum chamber is not kept clean and the water drain valves are not cleared, an accumulation of water, leaves and other debris may get collected in this area. Also, there are great chances of rat, mouse or small rodents entering into the vent of the plenum chamber. For this reason, the area of plenum chamber should be inspected and cleaned during routine maintenance and the water drain valves should be checked to make sure the vent allows proper drainage. If the water accumulates in the area of plenum chamber, the drain valves should be inspected and cleaned as necessary.
As shown in figure 1 of the prior art, water drain brackets in the existing automobiles have small drain hole socket on both the ends of the plenum chamber which may cause accumulation of waste particles like leaves to be trapped inside the plenum chamber. Depending on the type of automobile, the two water drain sockets A in the plenum chamber can be cleaned from above (only with plenum chamber cover removed) or from below (with left or right

wheel housing liner removed). With the automobile raised, for example, it is possible to clean the two water drain sockets B from underneath by way of the two wheel housings with the wheel housing liner removed. If the water drain sockets B are clogged with leaves and pine needles, the drains may freeze up during the winter season and thus prevents the drainage of water from the chamber. After a short journey, the heat emitted by an engine and an exhaust system melts ice in the drains again. By the time the automobile arrives at the workshop, the water may have drained out of the plenum chamber again. The water drain sockets B are installed from above in the drain openings in the body A. With the wheel housing liner removed, the water drain sockets can also be removed and installed from underneath.
In automobiles, clogged water drain valves can allow rainwater to accumulate in the plenum tray (at the base of the windshield). The water may leak into the automobile's interior, brake booster, or electrical components, which can lead to major problems. It may also have other problems like sloshing water sound round corners, potential ECU damage, gallons of water entering the car through pollen filter into the foot wells, long term musty smell and carpet damage and inner sill SRS sensors failure (caused by corrosion).
The existing solution to keep the drain valve of the plenum chamber clear of debris is by carefully poking out any debris without damaging the fragile rubber drain flap of the plenum chamber. Attempts are made to avoid the blockage of the drain sockets of the plenum chamber by enlarging the diameter of the drain socket. However, it has the drawback by paving way for some rodents or other insects to enter inside the plenum chamber,
Accordingly there exists a need to address these drawbacks of the conventional repairing or maintenance methods of the drain valve of the plenum chamber. Also, there exist a need to provide a water drain valve which completely

eliminates the blockage of valve by leaves or other debris and also requires less cleaning or maintenance of the drain valve.
Objects of the present invention
An object of the present invention is to avoid clogging or blockage in a vent of a plenum chamber due to leaves or other debris.
Another object of the present invention is to provide a water drain bracket assembly for plenum chamber of an automobile which requires no maintenance.
Yet another object of the present invention is to prevent entry of small rodents or insects.
Summary of the invention
Accordingly, the present invention provides a water drain bracket assembly for draining water inside a plenum chamber of a automobile. The water drain bracket assembly comprises a hollow rectangular bracket having a pair of bracket hinges configured on one inner side thereof, a flap having a pair of hinges configured on one side thereof and a pair of stoppers configured on other side thereof, a pin member capable of connecting the pair of bracket hinges and the pair of hinges thereby moveably connecting the flap to the hollow rectangular bracket, a spring coiled over the pin member, the spring having a first end engaging with inner side of the hollow rectangular bracket and a second end engaging with lower surface of the flap. The pair stoppers of the water drain bracket assembly remain in contact with the lower surface of the hollow rectangular bracket due to spring tension thereby keeping the flap closed, and when the water pressure inside the plenum chamber exceeds the spring tension, the flap opens up thereby draining the water inside the plenum chamber and the flap slowly revert to its original position due to the opposite spring tension.

Brief description of the figures
The objects and advantages of the present invention will become apparent when the disclosure is read in conjunction with the following figures, wherein
Figure I shows a perspective view of a drain valve socket present in the plenum chamber of a automobile of the prior art;
Figure 2a shows position of a water drain bracket assembly located on left side of the plenum chamber of a automobile, in accordance with the present invention;
Figure 2b shows position of a water drain bracket assembly located on right side of the plenum chamber, in accordance with the present invention;
Figure 3 shows a top perspective view of a water drain bracket assembly with a flap in closed/normal position;
Figure 4 shows a top perspective view of the water drain bracket assembly with the flap in open position;
Figure 5 shows detailed view of a spring and the flap of the present invention; and
Figure 6 shows a side view of the water drain bracket assembly;
Detailed description of the present invention
The foregoing objects of the 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.
The present invention provides a water drain bracket assembly. The water drain bracket assembly avoids clogging or blockage in a vent of a plenum chamber drain valve of a automobile due to leaves or other debris. Further, the water drain bracket assembly requires no maintenance. Furthermore, the water drain bracket assembly prevents entry of small rodents or insects inside the plenum chamber of the automobile.
The 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 to figures 2a and 2b, there is shown a water drain bracket assembly (hereafter referred as 'the assembly (10)r), in accordance with the present invention. The assembly (10) of the present invention is placed below a wind shield (20) under a bonnet (30). The assembly (10) is located on both sides of a plenum chamber (40) as in the places of the existing drain valves of automobile.
Referring now to figure 3-6, the assembly (10) for draining water inside the plenum chamber of the automobile of the present invention in various positions is illustrated. The assembly (10) comprises a hollow rectangular bracket (12) (hereinafter referred as 'the bracket (12)!), at least a pair of bracket hinges (14), a flap (16), at least a pair of flap hinges (18), at least a pair of stoppers (20a and 20b), a pin (22) and a spring (24).
The bracket (12) includes the pair of bracket hinges (14) configured on one inner side. Specifically, the bracket (12) includes a first bracket hinge (14a) and a second bracket hinge (14b) fixedly secured on one of an inner side of thereof.t.

The bracket (12) is made up of hard materials such as metal, plastic and the like. The bracket (12) is adaptably secured with the plenum chamber (40) to prevent water leak into the automobile's interior, brake booster, or electrical components. The first bracket hinge (14a) and the second bracket hinge (14b) have an aperture of same diameter positioned centrally to have the pin (22) inserted therein for enabling attachment of the flap (16) to the bracket (12)
The flap (16) is flat structure made up of hard materials such as metal, plastic and the like. The flap (16) in the present invention is rectangular flat structure have four sides. However, it is understood that the flap (16) of varying shape can be modulated as per the requirement. The flap (16) includes the pair of flap hinges (18a and 18b) on one side and at least a pair of stoppers (20a and 20b) configured on other side. The first flap hinge (18a) and fhe second flap hinge (18b) of the flap (16) are secured on a first side of the flap (16).
The pair of stoppers (20a and 20b) is fixedly secured on a third side of the flap (16). The pair of stoppers (20a and 20b) is capable of contacting with at least one of a lower side of the r bracket (12) in a closed/ normal position and an open position. The first flap hinge (18a) and the second flap hinge (18b) have a central aperture adapted to align parallel with the apertures of the first bracket hinge (14a) and the second bracket hinge (14b) to be engaged with the pin (22).
The pin (22) is an elongated member having a first end and a second end capable of connecting the pair of bracket hinges (14) and the pair of flap hinges (18) thereby moveably connecting the flap (16) to the bracket (12). The pin (22) in the present embodiment engages parallely with the aperture of the pair of bracket hinges (14) and the central aperture of the pair of flap hinges (18) securing the bracket (12) and the flap (16) together. The first end of the pin (22) engages parallely with the first bracket hinge (14a) and the first flap hinge (18a). The second end of the pin (22) engages parallely with the second bracket hinge

(14b) and the second flap hinge (18b). The elongated shaft of the pin (22) includes spring (24) covered thereon.
The spring (24) is made up of hard materials such as metal, plastic and the like which facilitates the flapping mechanism to open and close the flap (16). The spring (24) is coiled over the pin (22). The spring (24) includes a first end engaging with one of the inner side of the bracket (12) and a second end engaging with the first side of the flap (16).
Under normal conditions of the assembly (10), the stoppers (20a) and (20b) remain under spring tension and in surface contact with the lower surface of the bracket (12). The flap (16) is kept closed in absence of load acting on the upper surface of the flap (16).
The assembly (10) with the flap (16) in the open position is illustrated in figure 4. The flap (16) opens up when the water pressure inside the plenum chamber (40) of the vehicle exceeds the designed spring tension /load. The opening of the flap (16) enables the water from inside the plenum chamber (40) to drain off at the quickest time. Further, the flap (16) slowly reverts to the original closed position due to the opposite force acted by the spring (24). The stopper (20a) and (20b) provided at the end sides of the flap (16) restricts that the flap (16) from opening inside the compartment of the plenum chamber (40). In the present embodiment, the flap (16) includes L shaped stopper (20a) as shown in figure 5 which prevents the flap (16) to move upwards towards the plenum chamber (40).
In alternate embodiment, the assembly (10) and the flap (16) of the present invention can be of varying shape and size as per requirement of the automobiles plenum chamber.

In one more alternate embodiment, the assembly (10) is provided with a multiple hinges depending on the requirement of the automobiles plenum chamber.
Furthermore, the drain bracket assembly (10) of the present invention facilitates to be used in many applications in areas dealing with problem of water clogging and water draining.
Advantages of the present invention
1. The assembly (10) of the present invention arrests entry of external agents like rats, insects and the like into the plenum chamber (40) which pose danger to wiper wiring harness, HVAC foam pads and the like. The assembly (10) prevents any accidental trapping of rats / insects which may block the HVAC cut-outs. In case rat / insect is dead inside plenum chamber the issue foul smell inside cabin is prevented.
2. The assembly (10) prevents retention of waste materials like leaves or other debris inside the plenum chamber (40).
3. The fully deflecting torsion flap (16) of the drain bracket assembly (10) causes immediate drainage of water from the plenum chamber (40).
The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omission and substitutions of

equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the present invention.

We Claim
1. A water drain bracket assembly for draining water inside a plenum chamber of a automobile, the water drain bracket assembly comprising:
a hollow rectangular bracket having a pair of bracket hinges configured on one inner side thereof;
a flap having a pair of flap hinges configured on one side thereof and a pair of stoppers configured on other side thereof;
a pin member capable of connecting the pair of bracket hinges and the pair of hinges thereby moveably connecting the flap to the hollow rectangular bracket:
a spring coiled over the pin member, the spring having a first end engaging with inner side of the hollow rectangular bracket and a second end engaging with lower surface of the flap; and
wherein the pair stoppers remain in contact with the lower surface of the hollow rectangular bracket due to spring tension thereby keeping the flap closed, and when the water pressure inside the plenum chamber exceeds the spring tension, the flap opens up thereby draining the water inside the plenum chamber and the flap slowly revert to its original position due to the opposite spring tension.