FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See Section 10; rule 13)
TITLE OF THE INVENTION An Improved Air Vent Assembly for Vehicles
APPLICANTS
TATA MOTORS LIMITED, an Indian company
having its registered office at Bombay House,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
INVENTORS
Mr. Ranganath Kumar S.V., Balaji .K & Sangeet H. Kapoor
All Indian nationals of TATA MOTORS LIMITED,
an Indian company having its registered office
at Bombay House, 24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
PREAMBLE TO THE DESCRIPTION The following Complete specification particularly describes the invention and the manner in which it is to be performed.

FIELD OF INVENTION
This invention is related to air vent assembly for use in ventilation of the passenger compartment in vehicles and more particularly to air vents which enhances the occupants comfort in a vehicle.
BACKGROUND OF INVENTION
It is important to provide ventilation for the passenger compartment in an automobile to enhance occupant comfort. This helps in keeping the passenger fresh by avoiding strain and fatigue in long drives and this also helps in preventing the accidents. There are two ways by which a vehicle designer provides such ventilation viz., natural ventilation or a sophisticated HVAC (heating, ventilation & air conditioning) system.
This invention deals with provision of natural ventilation in an vehicle which can be provided in two ways one is by ram air ventilation when vehicle is in running condition and another one is by forced ventilation by using blowers/fans.
Presently it is in practice to provide the natural draft through provision of vents at leg levels. Due to the location of these vents, the incoming ram air is confined to the area of leg & floor space of the passenger compartment. Therefore the ram air does not provide the required comfort at chest level. Further the ambient temperature of the passenger compartment rises above the natural ambient due to absence of air flow. To overcome these
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shortcomings, the only alternative being used is to provide a full fledged HVAC system.
KR 970007642 teaches natural ventilation device of a vehicle consists of the front face rotary device so the driver as to freely control the operation for the regulation of the air flow, the rear face rotary device able to regulate the air flow, installed in the inner part between the inner side of the rear part and the rear window, and the upper panel to reduce such noise as air or raindrop or the like and the lower panel through which the air is flowed in and out, as this invention involves one or more rotary components, which may result in noise, vibration and harshness(NVH) problem, and in addition to this in this case there is no proper circulation of air at desired location.
JP10095226 also teaches Ventilating device for vehicle, this device consists of an inner panel and an outer panel forms a body side wall panel with semi-closed space. An exhaust opening is formed at the outer panel through a drafter in relation to an intake opening formed at the inner panel. A fan opposed to the intake opening is mounted on the inner panel. Luggage compartment side air sucked from the intake opening in association with the rotation of the fan is pressurized in the semi-closed space so as to open the drafter, and the air is guided to the exhaust opening. This invention teaches device used for forced natural ventilation, which requires external power for its operation and may also result in noise, vibration and harshness (NVH) problem.
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Objects of invention:
The main object of this invention is to provide air vents for natural ventilation through ram air.
Another object of this invention is to provide air vents which will be able to keep the passenger compartment temperature equal to ambient temperature and maintain indoor air quality by continuous replacement with ram air.
Another object of this invention is to provide air vents working independently of power requirements for its operation.
Another object of this invention is to provide air vents which are simple in construction and are cost effective.
BRIEF DESCRIPTION OF INVENTION
Air vents in accordance with this invention basically consists of following components
1. Horizontal vanes
2. Vertical vanes
3. Circular vanes
4. Knob
5. Fixed vanes
6. Inner vent housing
7. Instrument panel
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8. Windshield
9. Outer vent housing lO.Front upper panel

11. Sealant
12. Groove
Air vent comprises inner vent assembly and outer vent housing, said inner vent assembly consists of horizontal, vertical and circular vanes. Vertical
vanes are rigidly fixed to the inner vent housing, horizontal and circular vanes are adjustably fitted to the inner vent housing. A knob is provided on the extreme end of inner vent housing for closing and opening the horizontal and circular vanes according to the passenger requirements. The inner vent housing is extended up to the outer vent housing to guide the captured ram
air. The opening of the vent is adjustable to the requirement of passenger comfort condition by adjusting the knob. Outer vent housing consists of fixed vanes to guide the ram air in to the vehicle. The fixed vanes are designed / oriented in such a way that water from outside will not enter the vents and into the vehicle therethrough. Inner vent assembly is located between the top end of dashboard and bottom of the windshield and outer vent housing is located outside between the bottom end of the wind shield and the front upper panel of the vehicle.
DETAILED DESCRIPTION OF INVENTION
Referring now to the drawings which illustrate a preferred embodiment of the invention only and are not limitive.
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Fig. 1 - shows a front view of outer vent housing
Fig. 2 - shows an air vent assembly in accordance with this invention
Fig. 3- shows an inner vent assembly in accordance with this invention Fig. 4 - shows the front panel of a vehicle provided with air vent
according to this invention.
Fig. 5- shows a sectional view X-X taken on air vent fitted on front upper
panel of fig.4
Fig. 6 - shows the instrument panel of a vehicle fitted with the air vent in
accordance with this invention.
Now referring Figures 1 to 6 the inner vent assembly consists of horizontal vanes (1), vertical vanes (2) and circular vanes (3). The said vertical vanes are fixed to the said inner vent housing (6). The design of vertical vanes orientation is optimized from the experimentation when the vehicle/automobile is in running condition. The number of vertical vanes required are decided on the basis of experimentation.
Circular vanes (3) are rigidly fixed to the horizontal vanes (1) and said horizontal and circular vanes are adjustably fitted to the said inner vent housing (6) in such a way that movements in upward and downward direction are possible to enable passenger to regulate the flow of air inside the compartment as desired. At least one horizontal and/or circular vane is provided with a projection to adjust the position of said vanes or a knob (4) of desired size and shape is connected to the horizontal vane (1) through a link on an inner vent housing so that the position of the vent opening can be controlled by rotating the said knob (4). The horizontal and circular vanes
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(1, 3)can be fully closed when not in use or fully open when its maximum use is required. The horizontal and circular vanes (1,3) are oriented such that there will not be air leakage when vents are in fully closed position. Said vertical vane of inner vent assembly is provided with a grove (12) to stop further movement of horizontal and circular vanes (1, 3) in order to divert the air on to the face of the passenger.
The said inner vent housing (6) is extended up to the outer vent housing (9) to guide the captured ram air and are leak-proofingly sealed. A sealant material (11) is provided at the joints of extended portion of inner vent housing to outer vent housings in order to prevent the leakage of air. The inner vent housing (6) is located between the top end of instrument panel (7) and bottom of the windshield (8). Said outer vent housing (9) is located at the outside of the vehicle between the bottom ends of the said windshield (8)and the front upper panel (10). The location of said outer vent housing (9) is being selected through experimentation by identifying the high pressure zones on the vehicle when the vehicle is in running condition. Said outer vent housing (9) consists of rigidly fixed vanes (5) which guide the ram air in to the vehicle / automobile. The said fixed vanes (5) are oriented at an angle in such a way that the ram air is allowed to enter in to the vehicle with less pressure drops and increased air discharge and to prevent any water droplets from entering the vehicle during rainy season and during washing of the vehicle.
The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of
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illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof.
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WE CLAIM
1. An improved air vent assembly for automobile vehicles comprising an inner and outer vent housing (6, 9), said inner vent housing (6) being provided with a plurality of vertical, horizontal and circular vanes (2, 1, 3), said vertical vanes (2) being fixedly mounted thereon, said circular vanes (3) being fixedly mounted on said horizontal vanes (1), while said circular and horizontal vanes (3, 1) being adjustably disposed within said inner vent housing (6); said inner vent housing (6) extending up to said outer vent housing (9) and is scalingly engaged therewith, said outer vent housing (9) having vanes fixed thereto for guiding the ram air into the vehicle.
2. The improved air vent assembly as claimed in claim 1 where in said vanes of outer vent housing are rigidly fixed to the outer vent housing at an angle to facilitate the entry of ram air into the vehicle with least pressure drop and maximum air flow and to prevent entry of water droplet inside the vehicle.
3. The improved air vent assembly as claimed in claims 1 and 2 wherein a sealant material is provided at joints of extended portion of inner vent housing to outer vent housings in order to prevent the leakage of air.
4. The improved air vent assembly as claimed in claim 1 wherein at least one horizontal and/or circular vane (1, 3) is provided with a projection to adjust the position of said vanes.
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5. The improved air vent assembly as claimed in claim 1 wherein a knob (4) is provided on said inner vent housing (6) for adjusting the position of horizontal and circular vanes (1,3).
6. The improved air vent assembly as claimed in claim 1 wherein said vertical vane (2) of inner vent housing (6) is provided with a groove (12) to omit the movement of horizontal and circular vanes (1,3).
7. The improved air vent assembly as claimed in claim 5 wherein said knob is connected to the horizontal vane through a connecting link.
3. The improved air vent assembly substantially as herein described with reference to accompanying drawings.
Dated this fh day of March 2007
TATA MOTORS LIMITED By their Agent and Attorney

It it
(KARUNA GOLERIA) of DePENNING & DePENNING
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Abstract
Title: An Improved Air Vent Assembly for Vehicles
This invention relates to an improved air vent comprises inner vent assembly and outer vent housing, said inner vent assembly consists of horizontal vane (1), vertical vane (2) and circular vane (3). Vertical vanes are rigidly fixed to the inner vent housing (6), horizontal and circular vanes are adjustably fitted to the inner vent housing. A knob (4) is provided on the extreme end of inner vent housing for adjusting the horizontal and circular vanes (1,3) for closing and opening depends on the passenger requirement. The inner vent housing (6) is extended up to the outer vent housing (9) to guide the ram air which captured. Outer vent housing (9) consists of fixed vanes (5) to guide the ram air in to the vehicle. The fixed vanes (5) are oriented in such a way that the water from outside will not enter inside the vents and into the vehicle. Inner vent assembly is located between the top end of dashboard and bottom of the windshield (8) and outer vent housing (9) is located at the outside of the vehicle between the bottom end of the wind shield (8) and the front upper panel (10).
Fig. 2 - Shows an air vent in accordance with this invention
Fig.2