Ventilation – Chimney or stack – Chimneytop or stacktop structure
Reexamination Certificate
1999-03-11
2001-02-20
Wilson, Pamela (Department: 3749)
Ventilation
Chimney or stack
Chimneytop or stacktop structure
C454S042000, C454S367000
Reexamination Certificate
active
06190251
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
This invention relates generally to a fixed type ventilator and, more particularly, a ventilator that is easy to assemble and with an improved performance of exhausting indoor air.
2. Description of the Related Art
Conventional fixed type ventilators generally include an upper extension part in shape of a disk with its center hollow, and a lower part with horizontal extension for fixing bolts and several plates that are layered one after another for its installation. There are, however, several problems with the conventional ventilators as described above. One such problem is that the metal support pipe at the bottom of the fixed hole of each air current guide plate must be made in one unit, resulting in a complex ventilator structure, because the support and the supporting device must have a respective round frame and a connection piece in the horizontal direction. Another problem is that the angle of inclination of the main wall of each air current guide plate is too vertical, which fails to induce stable flow of air current, thereby causing poor ventilation of indoor air. At the same time, modifying the inclination of the main wall by trial and error is ineffective, because there is a lack of a reference figure to improve the ventilation rate of indoor air.
Therefore, there is a need to change the above mentioned connection structure of air current guide plates into a more simple assembly structure while at the same time, optimizing the structure of the air current guide plate by means of accurate data on inclination angle of the inclination main wall to improve the exhaustion of indoor air.
In light of the above mentioned problems with the conventional air current guide plate, there is a need for a fixed type ventilator with improved exhaustion performance by optimizing the inclination angle of the main wall. There is further a need to simplify the connection and assembly structure of air current guide plate for easy installation.
OBJECT AND SUMMARY OF THE INVENTION
One of the objective of the present invention is to provide an improved fixed type ventilator that exhausts greater volume of indoor air, and is easy to assemble and install.
In accordance with one aspect of the present invention, these and other objectives are accomplished by providing a fixed type ventilator comprised of a second air current guide plate (
300
), which is located at the top of the uppermost layer of a plurality of first air current guide plates (
200
). The plates (
200
) and (
300
) are assembled by connecting means (
400
). The first air current guide plate (
200
) has a horizontally extended part (
230
) with fixed holes (
210
), and an inclined main wall (
240
) defining an opening (
220
) at the top of the plate (
200
). The second air current guide plate (
300
) has an inclined main wall (
350
) with a horizontal extension plate (
340
) at the base of the wall (
350
), and a blocking plate (
330
) to cover the wall (
350
). The second air current guide plate (
300
) prevents penetration of rainwater and guides inflow of air current.
This invention with its simple structure saves cost in manufacturing and installation, and improves the volume of exhaust of indoor air by natural air current.
REFERENCES:
patent: 2830526 (1958-04-01), Breidert
patent: 3049068 (1962-08-01), Rousey
patent: 3064638 (1962-11-01), Bauer
patent: 4638727 (1987-01-01), Mitchell
patent: 5655964 (1997-08-01), Rheault
patent: 101095 (1990-03-01), None
Mattera Michelle A
Oppenheimer Wolff & Donnelly LLP
Wilson Pamela
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