Stoves and furnaces – Stoves – Cooking
Reexamination Certificate
2002-01-17
2003-10-28
Basichas, Alfred (Department: 3743)
Stoves and furnaces
Stoves
Cooking
C126S21400R
Reexamination Certificate
active
06637425
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for supporting a gas burner mounted cantilever fashion on a wall of a tank for collecting spills, and for locating the burner relative to a safety/igniter system fixed to another wall of the tank.
2. Description of the Prior Art
In domestic cookers, the gas burners are generally placed directly on a flat support, for example a pressed stainless steel plate. This fixed mounting has the advantage that cleaning requires few handling operations, with only the grid to be removed from the burner. The flat support offers a continuous surface that is easy to clean. Location is accurate and reliable.
However, the above solution can be used only for low-power burners, because the burners are close to the plane of the grid. Also, because the support plane is close to the burner flame exit, spills are carbonized on the flat support and become difficult to remove.
In professional cookers, the above solution is often unsatisfactory because of the limited power of the burners.
To solve the problem of spills becoming carbonized, and the resulting cleaning problems, in professional cookers it is usual to spread aluminum foil over the surface of the flat support and to discard the aluminum foil at the end of a shift, to avoid the fastidious cleaning task.
When it comes to high-power burners, most professional equipment manufacturers offer solutions combining a fixed or demountable burner located at some distance above a spill recovery device including a removable tank or a removable cleaning drawer. Some tanks can receive water, poured into them manually, to prevent carbonization of grease.
The removable drawers or tanks presuppose tops that are not sealed against spills, and most importantly against cleaning water. There are interstices between the tanks or drawers and the supports and between the burners (when they are demountable) and the tanks, and in practice these interstices do not prevent various kinds of infiltration.
Moreover, once the drawers or tanks have been removed, nothing prevents the infiltration of various kinds of discharge into the body of the equipment.
The removable drawers or tanks are intended to contain water, but in reality they are rarely used with water. At the end of a shift, removing the drawer or tank full of water is problematical from the ergonomic point of view. It is even difficult not to spill its contents into the equipment (because of a wave effect, and the varying height of the sides above the surface of the water), especially as the drawer or tank is often hot. The removable side of the drawer or tank often prevents the provision of a water inlet and imposes manual filling, which is even more of a nuisance for users as the water quickly evaporates during a shift. Burnt on spills are then again a problem.
What is more, thorough cleaning presupposes numerous handling operations, such as having to remove the grids, the burners and the tank before obtaining access to the internal walls.
Finally, safety and igniter systems, which must be fixed, rather than removable, are disposed near the burners. Current arrangements do not protect the safety and igniter systems effectively. Frequent handling of the burners and tanks leads to repeated knocks, which can degrade the safety and igniter systems prematurely.
In an attempt to remedy these drawbacks and to solve most of the problems referred to above, it has already been proposed to use a fixed, sealed, welded water tank equipped with a drain with no discontinuities in its surfaces. Above the tank is disposed an assembly comprising two burners joined together (a proximal burner and a distal burner), with a horizontal gas inlet, and mounted cantilever fashion on a vertical wall of the tank. A safety and igniter system (comprising a pilot light, a thermocouple and an igniter electrode) for each burner is fixed to a wall of the tank, with a protective arrangement to protect it from knocks and spills.
The principal advantage of this solution is that it is virtually ideal from the hygiene point of view. The deep tank is in practice always used with water in it, because filling it is very simple (requiring no handling of the tank). A fixed water inlet is even provided on the front wall of the tank which, in conjunction with an overflow siphon for draining the tank, makes it very easy to use. Ordinary cleaning does not necessitate handling any of the accessories. It is generally sufficient to drain the tank and to give a quick wipe with a cloth, without even removing the grid. Should it be necessary to clean the bottom of the tank using a sponge, the burner assembly can be removed, without using tools, to expose the smooth surface of the bottom of the tank. The sealed and fixed tank offers a sealed solution with no possibility of infiltration of spills. With regard to reliability, the pilot light, the thermocouple and the igniter electrode are well protected from knocks and spills.
There are still some drawbacks, however. Thus, because of the weight and the length of the combination of two burners, it is difficult to ensure accurate relative location of the burner and the pilot light, both vertically (risk of sagging due to the weight of the combination of burners) and laterally (left/right). Sagging of the burner assembly leads to a loss of efficiency, especially of the distal burner, because of the distance of the burner from the bottom of the pan, and can lead to heating of the walls of the tank. Another drawback relates to reliability; even if the location of the burner assembly is correct at the outset, repeated handling of the assembly can cause it to sag to a greater or lesser degree.
To attempt to remedy this problem of sagging, it is possible to add “struts” resting on the bottom. However, these struts are in contact with the water in the tank and prevent cleaning the bottom with a sponge without removing the burner.
The burner assembly must be mounted cantilever fashion on the front wall of the tank. The necessity to be able to demount the burner assembly for cleaning, without using any tools, makes it very difficult to obtain a compromise such that minimal clamping nevertheless provides sufficient immobilization to locate the burners. This is why, in practice, either the user has routinely to demount the burner assembly, and its fixing is therefore not very precise, in which case location is a somewhat hit and miss affair, or its fixing is tight, to improve location, in which case the user generally ceases to demount the burner assembly.
This solution, even if it constitutes real progress, is therefore still open to improvements in relation to cleanability, accurate location of the burners relative to the pilot lights, and combustion efficiency (i.e. the location of the burners relative to the grid), as well as the reliability/durability aspect, associated with demounting and replacing the burner assembly for cleaning, which reduces the accuracy of its location.
The present invention is aimed at a device for supporting and locating gas burners which remedies the drawbacks of prior art solutions by combining the facility for very simple mounting/demounting with guaranteed, permanent and very accurate relative location of the burners and the pilot lights. The invention is also aimed at a device for supporting and locating gas burners which provides the required mounting/demounting and location functions at low cost and without impeding the cleaning of surfaces.
SUMMARY OF THE INVENTION
The invention provides a device for supporting a gas burner mounted cantilever fashion on a wall of a spill recovery tank and for locating the burner relative to a safety/igniter system fixed to another wall of the tank, in which device the burner and the safety/igniter system cooperate when the burner is mounted to enable the burner to rest on and locate itself on the safety/igniter system to immobilize the burner relative to the safety/igniter system.
The burner preferably includes a downwardly open opening and the safety/igniter syst
Girod Michel
Lubrina Yves
Basichas Alfred
Thirode Grandes Cuisines Poligny
Young & Thompson
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