Gas hob

Details Gas hob Gas hob

1999-08-13

2001-02-27

Lazarus, Ira S. (Department: 3743)

Stoves and furnaces

Stove lids and tops

Liquid or gaseous fuel

C126S0390BA, C126S0390BA, C126S21400R

Reexamination Certificate

active

06192879

ABSTRACT:

The invention relates to a gas hob comprising support means for a cooking vessel and flame orifices.
Gas hobs using direct flame contact to the cooking vessel are traditionally disposed with a central flame generating burner and support means for the cooking vessels which may take the shape of centrally pointing metal struts or a grid made of heavy gauge metal wire. Below the burner and the support means there is frequently disposed a dish-shaped depression to collect any food which escapes the cooking vessel during the cooking. The traditional method for controlling the heat generation of the flame is by controlling the amount of gas that is fed to the burner, the gas being supplied at a velocity such that the required air is drawn in to be mixed with the gas. The mixture is ejected radially outwards from the central burner where it burns, either as individual flames from orifices or as a sheet of flame. It has turned out that a larger range of adjustment would be desirable, and it could be considered to control the gas supply to orifices individually. However, in a central burner this is difficult and requires fairly long gas or gas/air mixture lines from the valves to the burner.
According to the invention this problem may be solved by literally turning the burner/hob construction inside-out. This is done in a gas hob according to the invention which is particular in that the support means for the cooking vessel contain orifices for gas flames which point inwards towards the center of the cooking vessel.
An advantageous embodiment of the invention is obtained when the support means for the cooking vessel have a flat top surface which form part of the general top surface of the hob, said surface having deep channels forming air and exchaust passages for the flames. This means that a range of cooking vessels may be slid across the surface while being at all times supported to ensure against toppling,
A further advantageous embodiment is particular in that each channel is deepest below the location of the cooking vessel when in use. This ensures that spillage will collect at the bottom of the channel from where it may be removed.
A further advantageous embodiment is particular in that each inwards pointing orfice is individually supplied with gas controlled via a valve arrangement located in the hob. This constitutes an efficient use of the space below the top surface of the hob which apart from the channels for the exhaust and for collecting spills is available for valves and gas lines as well as for control arrangements.
A further advantageous embodiment of the invention will be realized when the entire top part of the hob is made of an insulating, in particular ceramic or vitro-ceramic material. This means that electronic devices may be used to determine the presence and properties of a cooking vessel, such as electromagnetic devices, which will not have most of the effect short-circuited by conductive material near the cooking vessel.


REFERENCES:
patent: 670740 (1901-03-01), Sheppart
patent: 3592180 (1971-07-01), Kweller et al.
patent: 5342192 (1994-08-01), Hirano
patent: 5408984 (1995-04-01), Maughan
patent: 5425353 (1995-06-01), Herbert
patent: 2228565 (1990-08-01), None
patent: WO 97/1131 A1 (1997-03-01), None

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