Stoves and furnaces – Stoves – Cooking
Reexamination Certificate
2000-02-08
2001-07-24
Lazarus, Ira S. (Department: 3743)
Stoves and furnaces
Stoves
Cooking
C126S0390BA, C431S278000, C431S354000, C239S444000
Reexamination Certificate
active
06263868
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a burner. More particularly this invention concerns a gas burner for a cook stove.
BACKGROUND OF THE INVENTION
A high-quality stove gas burner typically can produce a relatively large main flame and a smaller warming flame. The latter is normally set such that it cannot exceed a certain size, so that it can be used for simmering or warming but is not really powerful enough for most cooking procedures. The main flame is produced from nozzles that have an overall flow cross section that is much greater than the nozzles forming the warming flame. Typically the warming flame produces about 20% to 25% as much heat as the main flame.
In some systems the warming flame is centered in the burner and in this case it can be even smaller, between 10% and 12% of the overall burner capacity. While this is very handy for most applications, the centered position of this flame creates a hot spot in the center of the cooking utensil sitting on the burner, and in fact food can be burnt because of this concentrated location even in spite of the small size of the flame. Another disadvantage with this system is that a separate igniter must often be provided for the central flame, adding to the cost of the burner, and in general such a dual-flame burner can be quite complex.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to provide an improved gas stove burner.
Another object is the provision of such an improved gas stove burner which overcomes the above-given disadvantages, that is which has low-heat warming flame whose effect is spread out, and which is of simple construction.
SUMMARY OF THE INVENTION
A gas stove burner has according to the invention a base having an annular outer edge and a lower ring sitting on the base, forming therewith a lower compartment, and having an outer edge forming with the base outer edge an outwardly open annular slot communicating with the lower compartment. An upper ring sitting on the lower ring forms therewith an upper compartment and has an outer edge forming with the lower-ring outer edge an array of outwardly open holes communicating with the upper compartment. The upper-ring outer edge has a diameter generally equal to a diameter of the lower-ring outer edge. A gas/air mixture is fed to each of the compartments so that the gas will issue from the holes to form an upper flame and from the slot to form a lower flame of substantially the same diameter.
Thus with this system the warming flame is of the same diameter as the cooking flame. The heat it produces will therefore be spread out over the pot on the burner for effective warming or simmering without any dangerous hot spots. What is more the provision of the warming flame below the cooking flame allows it to be used to ignite the cooking flame, and vice versa, so that the construction of the burner is greatly simplified. The propagation of the warming flame through a gap has the advantage that it will ignite fully and stay ignited, as opposed to the problems of trying to keep a plurality of weak jets illuminated.
According to the invention a central inlet projects through the base and into the upper compartment and is connected to the gas/air feed. Another inlet projects through the base and into the lower compartment between the central inlet and the lower-ring edge and is also connected to the gas/air feed. The gas supply connected to the inlets includes independently operable and closable valves for feeding separate flows of a gas/air mixture to the compartments so that either of the flows can be completely cut off to completely eliminate the respective flame. Thus the upper cooking flame can be used independently or in addition to the lower warming flame, and the lower warming flame can be used alone.
The edges of the rings and base are all of generally the same diameter so that the flames are also of generally the same diameter. In addition the rings are circular and the lower-ring outer edge has an upwardly flaring frustoconical upper surface. The upper ring outer edge has a complementary and parallel lower surface spaced from the lower-ring upper surface and forming the slot therewith. The rings are circular and the upper-ring outer edge has a downwardly directed lower surface engaging an upwardly directed upper surface of the lower-ring outer edge and formed with an array of downwardly open notches forming the holes.
REFERENCES:
patent: 4305372 (1981-12-01), Hahn
patent: 4886043 (1989-12-01), Homer
patent: 5139417 (1992-08-01), Ghassemzadeh
patent: 5277576 (1994-01-01), Hartung et al.
patent: 5639232 (1997-06-01), Bogenschutz et al.
patent: 5765542 (1998-06-01), Fey et al.
patent: 70 158 (1917-02-01), None
patent: 488969 (1970-04-01), None
patent: 78 156 (1894-11-01), None
patent: 580 338 (1933-06-01), None
patent: 1931901 (1966-02-01), None
patent: 0081470 (1983-06-01), None
patent: 0485645 (1992-05-01), None
patent: 2728956 (1996-07-01), None
patent: 285 067 A (1928-05-01), None
patent: 1 364 890 (1974-08-01), None
Dacey Dennis
Koch Jurgen
Rummel Randy
AGT Gas Technology GmbH
Cocks Josiah C
Dubno Herbert
Lazarus Ira S.
Wilford Andrew
LandOfFree
Gas stove burner does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gas stove burner, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas stove burner will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2559615