Air intake device for land vehicles

A telescopic double wall air intake device having an antenna including an air intake canister attached to one end of the antenna and an air plenum arranged on the other end of the antenna. The air canister has disposable filtering material therein. The air plenum is attached to a frame of a car or other vehicle and carries the pneumatic or electric motor for moving the telescopic air intake device up and down. The air plenum may also be connected to a radio and other communication devices. The inlet side of a high static air moving device, e.g., an air booster fan, is connected to the air plenum via a flexible duct. The discharge side of the booster fan is connected to a second air plenum, e.g., an air mixing plenum, via a flexible metal air duct. The air mixing plenum has three connection ports, two of which are used for inlet flows and one of which is for discharge flow. The inlet ports are provided with check valves. The check valve in one of the inlet ports prevents air from travelling backwards to the booster fan. The other inlet port is connected to a conventional air inlet grille through a flexible metal duct. The discharge side of the air mixing plenum is connected to the conventional air distribution inlet of a car to provide air-conditioning inside the car cabin.

BACKGROUND OF THE INVENTION 
The present invention relates to an air intake device for improving the 
quality of air within the passenger compartment of land vehicles, such as 
automobiles. 
The modern city dweller spends about two hours per day in his or her car, 
plus additional leisure time, vacation time, commuting time. All told, the 
time a city dweller spends inside of, or in the vicinity of, a car in an 
urban environment is close to six hours per day or nearly one fourth of a 
person's lifetime. 
In the prior art, the air intake system of land vehicles, such as 
automobiles, is usually arranged behind the grille at the front end of the 
car. Air is drawn through the grille and then passed into the passenger 
compartment. The front grille is typically arranged at the level of the 
vehicle before the engine so that the air drawn through the grille is 
obtained from the air flow near the boundary layer of the road. However, 
it is known that some pollutants in vehicle exhaust plumes tend to settle 
near the ground. Thus, the air flow near the boundary layer of the road 
may contain pollutants exhausted from other vehicles on the road, 
especially in the case of bumper-to-bumper traffic when the exhaust plume 
of the car immediately in front may be directed into the front grille. In 
view of the irritating effects these pollutants may cause, it is desirable 
to avoid inhalation and contact with such pollutants. 
One solution to provide cleaner air in the passenger compartment of a 
vehicle is to drastically reduce the emission of pollutants in the exhaust 
gases of the vehicles. However, this solution seems highly unlikely at 
least for the first half of the twenty-first century. 
OBJECT AND SUMMARY OF THE INVENTION 
It is an object of the air intake device in accordance with the present 
invention to provide clean air for occupants of the vehicles to breathe 
inside the vehicles when the vehicles are travelling in congested city 
streets or highways, especially during rush hour. 
In an air intake device in accordance with the present invention, air to be 
passed into the passenger compartment is not obtained from the area near 
the front grille of the car or near the boundary layer of the flow as in 
the case of the prior art. The intake air is directed from an area where 
the pollutant content is less than that in the vicinity of the car. The 
air intake device is incorporated into the radio or communications antenna 
which is modified to pass air therethrough in a volume of about 50 cubic 
feet per minute. 
An inline booster fan should be utilized to overcome the friction losses 
caused by high velocity flow of air through the intake tubing, and to 
pressurize the car cabin in which the occupants are seated. 
The components of this system are easily available in the commercial 
market, or could be manufactured without encountering major obstacles. 
In one embodiment, a telescopic double wall air intake device is provided 
which includes an antenna, an air intake canister, or other air intake 
means, attached to one end and an air plenum arranged on the other end of 
the antenna. The air canister has disposable filtering material therein. 
The air plenum is attached to a frame of a car or other vehicle and 
carries a pneumatic or electric motor for moving the telescopic air intake 
device up and down. The air plenum may also be connected to a radio and 
other communication devices. The inlet side of a high static air moving 
device, e.g., an air booster fan, is connected to the air plenum via a 
flexible duct. The discharge side of the booster fan is connected to a 
second air plenum, e.g., an air mixing plenum, via a flexible metal air 
duct. The air mixing plenum has three connection ports, two of which are 
used for inlet flows and one of which is for discharge flow. The inlet 
ports are provided with check valves. The check valve in one of the inlet 
ports prevents air from travelling backwards to the booster fan. The other 
inlet port is connected to a conventional air inlet grille through a 
flexible metal duct. The discharge side of the air mixing plenum is 
connected to the conventional air distribution inlet of a car to provide 
air-conditioning inside the car cabin.

DETAILED DESCRIPTION OF THE INVENTION 
Referring to the drawings, wherein like reference numerals refer to the 
same elements, FIG. 1 illustrates vehicles 11 in typical bumper-to-bumper 
rush hour traffic. The vehicles 11 produce exhaust emission 10 which 
pollute the air and flow in the direction of arrows A. This polluted air 
is then drawn into the air intake system of the following vehicle since 
the air intake system is usually incorporated into the grille in the front 
of the car so that the air intake is close to the source of the exhaust 
emissions. This results in a higher percentage of pollutants inside the 
car cabin. 
In FIG. 2, the air flow pattern around a single vehicle 11 is shown. Air 
flows as an air stream AF.sub.1 from the vehicle in front of vehicle 11 
(not shown) and contains the exhaust emissions from that vehicle so that 
air flow AF.sub.1 has a higher percentage of exhaust gases than usual. 
Since the air intake area 12 is located around the front of the car, e.g., 
by the grille, the pollutant laden air in drawn into the inside of the 
car. As shown in FIG. 2, a second air stream AF.sub.2 flows at a level 
above the car and does not contain as much exhaust gases and pollutants 
but rather has a higher percentage of cleaner air. 
As shown in FIG. 3, an embodiment of the device in accordance with the 
present invention is denoted generally by 20. The device 20 extends from 
the surface of the car 11 into the air of cleaner air, e.g., into flow 
AF.sub.2. In this manner, the dirtier air in air flow AF.sub.1, is not 
drawn into the car and the air inside the car will thus have less 
pollutants from the exhaust emissions of the other cars on the road. The 
device 20 may be arranged, e.g., at a front end of the car or at a rear 
end of the car as shown in FIG. 3. 
FIG. 4 shows the elements of another embodiment of the device 12 in 
accordance with the present invention arranged in a car 11. The device 14 
comprises a telescopic air intake tube 14 having an air intake canister 16 
arranged at the upper end and an air plenum 18 arranged at the lower end. 
The telescopic air intake tube 14 is used as the antenna of the car for 
the radio or other communications device and has a height H which is 
attained by extending the telescopic antenna via motor drive 13. The air 
intake canister 16 has disposable filters arranged therein. The air plenum 
18 has connections to the radio or other communications device. The motor 
drive 13 extends and retracts the telescopic tube when desired. 
A flexible air duct 20 leads from the air plenum 18 to a high-static air 
booster fan 22. Another flexible air duct 24 leads from the booster fan 22 
through an inlet port having an air check valve 26 to an air mixing plenum 
28. Air is also passed through a flexible air duct 34 leading from the air 
intake grille of the car into the air mixing plenum 28 via another air 
inlet port having an air check valve 32. Thereafter, the air is mixed in 
the air mixing plenum 28 and directed through an outlet port to a flexible 
air duct 30 and then to the air distribution system of the car. The air 
booster fan 22 delivers about 75 cubic feet of air at 2 to 4 inches of Hg 
external static pressure. 
The end product of the telescopic air intake device (Urban Survival Kit) 
will be easy and inexpensive to produce, easy to install and will help to 
clean the air we breathe when seated inside vehicles. 
The variations and modifications that can be made and added to this product 
and pressurizing the car cabin are endless, and result in better and 
better air quality inside a car. 
FIG. 5 shows some different variations and accessories that can be added to 
the telescopic air intake device in accordance with the present invention. 
The air intake device 20a is extendable to a desired height, about twice 
the normal height of the air intake device as shown. Air intake device 20b 
is arranged to be flexible at least at an upper portion thereof. Air 
intake device 20c is arranged to be situated within the vehicle or outside 
of the vehicle depending on its desired position. Additional sensors and 
controls may also be incorporated into the air intake device in accordance 
with the present invention. 
The examples provided above are not meant to be exclusive. Many other 
variations of the present invention would be obvious to those skilled in 
the art, and are contemplated to be within the scope of the appended 
claims.