Stoves and furnaces – Stoves – Cooking
Reexamination Certificate
2000-01-13
2001-01-16
Lazarus, Ira S. (Department: 3743)
Stoves and furnaces
Stoves
Cooking
C126S0390BA, C431S191000, C431S143000
Reexamination Certificate
active
06173709
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a so-called outdoor portable gas cooking stove, and more particularly, to a burner structure of a portable gas cooking stove.
2. Description of the Related Art
FIG. 1
shows an example of a portable gas cooking stove known in the art.
Normally, the portable gas cooking stove
10
includes a gas cartridge
11
filled with compressed combustible gas, and a gas burner
12
mounted detachably on the gas cartridge
11
. The gas cartridge
11
and the gas burner
12
are coupled to each other in a hermetically sealed condition through a gasket
13
.
The gas burner
12
is comprised of a plug fitting
14
which is connected to the gas cartridge
11
and through which combustible gas supplied from the gas cartridge
11
passes, a gas flow adjusting spindle
15
which adjusts a degree of opening of a gas passage formed inside the plug fitting
14
to thereby adjust a flow of the combustible gas passing through the plug fitting
14
, a burner head
16
with a number of openings
16
a
and a flame hole
16
b
greater in area than the openings
16
a
, both formed on a surface thereof, a mixing tube
17
connecting the plug fitting
14
to the burner head
16
, a plurality of kettle holders
18
that are fixed on the mixing tube
17
and extend over the burner head
16
, and an igniter
19
mounted on a support
19
a.
The flame hole
16
b
is covered with a mesh net.
The portable gas cooking stove
10
having the above-mentioned structure is used as follows.
The combustible gas is filled in the gas cartridge
11
in a pressurized condition. Hence, when the gas passage is made open through the gas flow adjusting spindle
15
, the combustible gas in a pressurized condition enters the mixing tube
17
from the gas cartridge
11
through the plug fitting
14
. Thus, the combustible gas enters the mixing tube
17
with a gas flow thereof being adjusted by the gas flow adjusting spindle
15
.
The mixing tube
17
is formed with a number of openings
17
a
(only one of them is illustrated in FIG.
1
). External air is absorbed into the mixing tube
17
through the openings
17
a
by virtue of negative pressure produced when the combustible gas passes through the mixing tube
17
. The combustible gas is mixed with air entering the mixing tube
17
through the openings
17
a
, into a gas mixture of the combustible gas and air.
After entering the burner head
16
, the gas mixture is discharged through both the openings
16
a
and the flame hole
16
b
. The mixture gas having been discharged from the flame hole
16
b
is ignited by the electric igniter
19
located in the vicinity of the burner head
16
, and the mixture gas having been discharged through the openings
16
a
is also ignited by virtue of ignition of the mixture gas discharged through the flame hole
16
b.
Flame of burning gas mixture heats an object to be heated such as a pan, kettle, food, etc., put on the kettle holders
18
.
The flame hole
16
b
is formed generally by the steps of forming a hole at a surface of the burner head
16
, and covering the hole with a mesh net at an inner wall of the burner head
16
.
However, since the burner head
16
is generally small in size, it is a laborious step to cover a hole formed at a surface of the burner head
16
, with a mesh net at an inner wall of the burner head
16
. Accordingly, the step of fabricating the burner head
16
takes much time and much labor.
SUMMARY OF THE INVENTION
In view of the above-mentioned problem in the conventional gas cooking stove, it is an object of the present invention to provide a gas cooking stove which is capable of shortening a period of time necessary for fabricating a flame hole and simplifying a step of fabricating a flame hole.
There is provided a portable gas cooking stove, including (a) a mixture gas pipe having an open end through which a mixture gas of combustible gas and air is exhausted, (b) a burner head connected to the mixture gas pipe in a hermetically sealed condition and having at least one opening at a surface thereof, the mixture gas blowing out through the opening, (c) an igniter igniting the mixture gas blowing out through the opening of the burner head, and (d) a windscreen surrounding the burner head and formed with a flame hole facing the opening of the burner head, the igniter being located outside the windscreen in facing relation to the flame hole.
In the portable gas cooking stove in accordance with the present invention, the windscreen surrounding the burner head is formed with a flame hole at which mixture gas of combustible gas and air is ignited. Accordingly, it is no longer necessary to cover a hole formed at a surface of the burner head
16
, with a mesh net at an inner wall of the burner head
16
. This ensures fabrication of a flame hole in a shorter period of time and with less labor.
It is preferable that the flame hole is covered with a net.
The flame hole may be in the various forms. For instance, the flame hole may be comprised of a plurality of slits. As an alternative, the flame hole may be comprised of a plurality of holes randomly located in the windscreen.
It is preferable that holes are formed in a circular area.
It is preferable that the windscreen has a height higher than a summit of the burner head.
It is preferable that the windscreen is annular.
It is preferable that the burner head is comprised of planar plates and waveform plates alternately stacked one on another, the mixture gas being horizontally blown out through gaps formed between the planar plates and the waveform plates.
The burner head having the above-mentioned structure ensures that mixture gas is horizontally blown out, namely, towards the windscreen. Hence, the mixture gas perpendicularly enters the flame hole, and as a result, can be readily ignited by the igniter. In addition, since the mixture gas reaches the flame hole in minimum period of time, the mixture gas can be immediately ignited.
After the mixture gas has been ignited, the flame hole becomes red by flame. Hence, even if it were bright around the portable gas cooking stove, it would be possible to readily confirm that the mixture gas is burning, in comparison with a conventional gas cooking stove in which a flame hole is formed at a surface of a burner head. Thus, the portable gas cooking stove in accordance with the present invention enhances much safety in use relative to a conventional gas cooking stove.
The above and other objects and advantageous features of the present invention will be made apparent from the following description made with reference to the accompanying drawings, in which like reference characters designate the same or similar parts throughout the drawings.
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Lazarus Ira S.
Lee David
Snow Peak, Inc.
Young & Thompson
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