Stoves and furnaces – Stoves – Cooking
Reexamination Certificate
2000-01-27
2001-12-25
Clarke, Sara (Department: 3743)
Stoves and furnaces
Stoves
Cooking
C431S284000
Reexamination Certificate
active
06332460
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a gas burner assembly, particularly for incorporated cooking hobs of a gas cooker. More specifically, the present invention relates to a high-power burner assembly.
DESCRIPTION OF THE INVENTION
Gas burners are known for food cooking, comprising a burner body fed via nozzle by a gas stream which entrains a primary air stream and mixes with this latter to form a mixture which when suitably ignited generates a ring of radial flames the size of which can be adjusted by a cook positioned upstream of the nozzle.
Cooking appliances generally comprise burners with different outer flame diameters correlated with the power to be delivered, a currently increasing tendency being to include within the appliance at least one burner of high power.
The inclusion of high-power burners involves however certain limitations of a constructional and regulatory type.
A principal constructional limitation is due to the fact that in domestic appliances there is a need to be able to convert the use of the burner from one type of gas to another without having to completely open the cooker to replace the injector. In practice this means that it must be possible to replace one injector with another without having to remove important parts of the cooker. This means that the burner venturi duct has to be made small, so limiting the power obtainable from that burner.
Regulatory limitations impose a limit on the temperature of those parts of the cabinet in contact with the appliance, this certainly being an obstacle to the installation of high-power burners. For example in the U.S.A. the regulations do not allow the burner flames to emerge beyond the perimeter of the cooking pan, this being a severe test for very powerful burners.
To increase the power the diameter of the burner head must be increased to be able to disperse the larger air-gas mixture quantity through a larger number of flame orifices in order to restrict the flame length.
However even with a suitable burner head diameter the flames are often lengthy, especially when the gas pressure is low as is the case in the U.S.A., and they therefore tend to extend beyond the pan perimeter.
This situation also results in a burner efficiency problem, in that as the flames exert their main action on the outer edge of the pan rather than on its centre, the burner efficiency is low.
An object of the invention is to provide a burner which is of high power but at the same time has small head dimensions, producing sufficiently short flames.
A further object of the invention is to provide a burner which is of high power while at the same time being able to provide a very low minimum power, and hence the widest possible cooking range.
BRIEF SUMMARY OF THE INVENTION
These and further objects which will be more apparent from the ensuing description are attained according to the invention by a gas burner particularly for incorporated cooking hobs, comprising a burner body comprising at least two nozzles selectively feedable to form corresponding gas/air mixture in two separated mixing chambers provided with flame orifices, said flame orifices being positioned on two different levels.
REFERENCES:
patent: 2781779 (1957-02-01), Kindl
patent: 5277576 (1994-01-01), Hartung et al.
patent: 5401164 (1995-03-01), Yen
patent: 5704778 (1998-01-01), Hsieh
patent: 5842849 (1998-12-01), Huang
patent: 6132205 (2000-10-01), Harneit
Birch & Stewart Kolasch & Birch, LLP
Clarke Sara
Officine Meccaniche Defendi S.R.L.
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