Stoves and furnaces – Stove lids and tops
Reexamination Certificate
2000-04-18
2001-07-10
Lazarus, Ira S. (Department: 3743)
Stoves and furnaces
Stove lids and tops
C126S21400R, C126S0390BA, C219S452110
Reexamination Certificate
active
06257228
ABSTRACT:
DESCRIPTION
The present invention concerns a new tempered glass hob for kitchen, as well as the method used for making thereof.
The cooker hob is the main element in that part of kitchen electrical appliances devoted to cooking. In particular, it represents the heating element of cycles for saucepans, frying pans etc. The hob can be electric, that is heated by electrical resistors, can work with gas burners, or can be combined, electric and gas. Moreover, the hob can be of stainless steel, enamelled steel, vitreous ceramic or smooth float glass.
The aim of using glass hobs (in general) instead of the more traditional steel ones derives from a decision by the electrical appliance manufacturers and is based essentially on reasons of an aesthetic nature, because the innovative, fashionable look, better design opportunities and the possibility of applying the most varied and unlimited shades of colour compared with the colors that can be applied with enamelling. Another advantage of the glass cooker hob is that it does not require considerable investments in equipment (molds) as is the case for steel, on the other hand, and therefore favours a wide diversification of models at limited cost.
Currently known to the art are hobs made of transparent glass, consisting of a perfectly flat sheet of glass wherein the openings that serve to contain both the heating elements (electric plates, gas burners and the like) and the knobs and other controls in general are made by mechanical drilling.
The structure with a smooth, flat surface of the hobs of the prior art has the drawback of allowing foreign matter (generally liquid and solid food residues) to pass through these openings. Consequently, the underlying frame that supports the hob tends to get dirty and, with it, the supports of the electric plates and the gas burners, as well as any controls, also get dirty.
Added to this is the fact that the food residues that fall through the holes or the plates present on the hob often have a doughy consistency and are difficult to remove from the above mentioned parts, also because of the obstacles that are encountered when access to the inside area of the hob is desired.
Another drawback encountered in hobs of the prior art is that of the microcracks caused by the mechanical processes at the holes for containing the burners. These microcracks, which are unavoidable in normal glass drilling processes, can in fact give rise to breakage of the sheet of glass that forms the hob, as a result of the thermal shock induced by the high temperatures that are generated in proximity to the burners.
The main object of the present invention is that of providing a new hob for kitchens in general, such as to avoid foreign matter falling through the holes containing the heating means. The invention further has the object of providing a method for making said hob, such as to impart thereto a greater resistance to the thermal shock at the drilled surfaces that are situated near the burners.
These and other objects are achieved with the hob and with the method of claims
1
and
3
.
Further characteristics of said hob and of said method will emerge from the remaining claims.
With respect to cooking hobs of the prior art consisting of a drilled sheet of glass, the hob according to the invention offers the advantage of creating an obstacle to solid and liquid food residues falling through the holes containing the burners.
A further advantage lies in the fact that thanks to the method of the invention, microcracks at said holes are substantially eliminated with the result of giving the hob a better resistance to thermal shock.
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Cocks Josiah C.
Curvet SPA
Lazarus Ira S.
Sheridan & Ross P.C.
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