Combustion – Burner having electrical heater or igniter – Spark electrode in front of or adjacent fuel discharger
Reexamination Certificate
2000-07-07
2001-12-11
Price, Carl D. (Department: 3743)
Combustion
Burner having electrical heater or igniter
Spark electrode in front of or adjacent fuel discharger
C431S354000, C126S0390BA
Reexamination Certificate
active
06328556
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a gas burner. More particularly this invention concerns such a burner used on a commercial- or household-duty gas stove.
BACKGROUND OF THE INVENTION
A standard gas stove has an upper cooktop panel that is formed either of sheet metal or ceramic and that is provided with a plurality of burners. Each burner comprises a burner holder that is mounted underneath the cooktop panel and that is provided with a nozzle connected to a source of propane or butane, a burner head that is mainly above the cooktop panel and that diverts the gas from the nozzle normally into an annular array of jets, and a rack that fits over the head and that is intended to support a cooking utensil. A spark-type electrical igniter is also normally provided at each burner.
The rack normally is fitted with formations made in the cooktop panel. When the panel is made of sheet metal, it is relatively easy to provide appropriate seats for centering fingers on the rack, but when the panel is of ceramic, which is much more difficult to shape and machine, such centering formations are more difficult or impossible to provide. Thus the rack can slide about or be quite difficult to position accurately.
In addition the overall thickness of the cooktop panel varies considerably. When made of enameled steel it is quite thin, and when made of ceramic it is much thicker. In addition due to the difficulty of forming mounting holes in ceramic, the hole in the panel through which the burner extends is normally made larger in ceramic so that screws securing the head to the holder can pass through it, while with a metal panel it is easy to form separate holes for the mounting screws. it is therefore necessary to provide different burner constructions to accommodate the different panel thicknesses as well as the different layout of the mounting screws.
The burners typically vary in size, mainly in diameter. A large burner can in principle have, however, the same support as a small burner and merely needs a larger head and nozzle of greater flow cross section. Due to the larger head, it is necessary to provide the igniter at a different spacing from the center and, since the igniter is mounted on the holder, it has to be spaced differently from the center of the holder for burners of different sizes. Thus using the same holder is normally impossible and it is necessary to provide a separate holder for each burner size.
With many standard systems, large burners are somewhat taller than small burners. Thus a pot sits somewhat higher on a taller burner. This not only creates a nonuniform and unattractive appearance, but makes it impossible to set a cooking utensil, for instance a large kettle, on two adjacent burners of different size.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to provide an improved gas burner for a stove.
Another object is the provision of such an improved gas burner for a stove which overcomes the above-given disadvantages, which is, for example, of basically standardized construction so that most of its parts can be used both in small and large burners.
A further object is to provide such a burner which can be used both with sheet-metal and ceramic cooktops.
Yet another object is to provide a burner construction that allows a cooking utensil to be set atop more than one burner, even if the burners are of different capacities.
SUMMARY OF THE INVENTION
A cooktop panel having a throughgoing main mounting hole and upper and lower faces has a burner having according to the invention a holder underneath the panel, engaging the lower face at the hole, and provided with a gas inlet and a gas nozzle and a burner head mainly above the panel, engaging the upper face at the hole, and forming a downwardly extending intake passage into which the nozzle can feed gas. Fasteners engaged through the panel between the holder and the head retain the holder and head against the respective lower and upper faces. A burner cover atop the burner head forms therewith an annular gas-distribution chamber communicating with the passage and forms with the burner head an annular array of outlet openings. In accordance with the invention this cover is formed with an upwardly projecting rack-centering collar defining a central seat. A rack atop the cover is for centrally with a centering pin engaged in the seat.
Thus the rack according to the invention is centered on the burner bead. No formations need be made in the cooktop, and the centering formation can be a simple pin which makes fitting the rack in place, for instance after cleaning, a very simple and intuitive operation.
The burner further has according to the invention a cover plate fitting complementarily atop the burner cover and formed with a central hole exposing the seat. This plate can be decorative.
According to another feature of the invention the holder is formed with a radially projecting mounting arm in turn formed with at least one vertically throughgoing igniter hole. An igniter engaged in the igniter hole projects through the panel to immediately adjacent the array of outlet openings. The length of the arm of the holder is enough to accommodate burners of different diameters and more than one hole can be formed in it. Thus the same holder can be used for burners of different size.
The igniter hole according to the invention is provided with a liner sleeve. In addition the panel is formed offset from the main mounting hole with a supplemental hole aligned with the igniter hole and holding the igniter with the igniter hole. The burner head can also be provided with a radially projecting arm formed with a vertically throughgoing hole aligned with the supplemental hole and ignitor hole and holding the igniter therewith.
In accordance with another feature of the invention the main mounting hole is of a predetermined large diameter or a predetermined small diameter. The holder is formed with an upwardly extending collar fitting in the hole and having a lower large-diameter step corresponding to the predetermined large diameter and an upper small-diameter step corresponding to the predetermined small diameter.
Thus with this system the same holder can be used for thick ceramic panels or thin metal panels. Normally the thick ceramic panels have a large hole so that the fastening screws can engage through them. The metal panels with the smaller mounting hole have separate holes through which the mounting screws extend.
The steps according to the invention are cylindrical and coaxial. The mounting holes are usually circular.
According to another feature of the invention the holder is formed with a radially outwardly open groove and the burner cover is formed with a radially outwardly projecting ridge engaged in the groove. This structure ensures that these two parts fit together in the desired angular orientation, which is particularly important for aligning the ignitor with its mounting holes in the panel and head.
The gas-flow passage is constricted as a venturi and normally sucks in air to aid combustion. In addition normally the cooktop is formed with a plurality of such mounting holes each provided with a respective holder, burner head, means, and burner cover. The burner covers all having upper surfaces spaced a predetermined identical distance from the upper panel face. Thus the burners, whether big or small, have an attractive uniform appearance and a cooking utensil can be set stably atop two burners.
REFERENCES:
patent: 1030118 (1912-06-01), O'Neil
patent: 1291314 (1919-09-01), Welsenaar
patent: 2402997 (1946-07-01), Grayson
patent: 2960157 (1960-11-01), Dolby
patent: 3289731 (1966-12-01), Geber
patent: 5125390 (1992-06-01), Riehl
patent: 5133334 (1992-07-01), Riehl
patent: 5393224 (1995-02-01), Allen et al.
patent: 5443380 (1995-08-01), Riehl
patent: 5911572 (1999-06-01), Williams
patent: 5924860 (1999-07-01), Massey et al.
patent: 6030207 (2000-02-01), Salari
patent: 70 21 709 (1971-03-01), None
patent: 197 44 564 (1999-01-01), None
patent: 0 033 442 (1981-08-01), None
patent:
Dubno Herbert
Isphording Germany GmbH
Price Carl D.
Wilford Andrew
LandOfFree
Gas burner for stove 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 burner for stove, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas burner for stove will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2580019