Stoves and furnaces – Stoves – Cooking
Reexamination Certificate
2000-01-18
2001-08-07
Clarke, Sara (Department: 3743)
Stoves and furnaces
Stoves
Cooking
C126S02100R, C126S27300R
Reexamination Certificate
active
06269807
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims priority of British Patent Application Serial No. 9902805.2, filed on Feb. 10, 1998, and entitled, “Heat Storage Range Cooker. ”
BACKGROUND OF THE INVENTION
The invention to which this application relates is to a heat storage range cooker of a type which has an indirect heating source which is used to generate heat typically in at least one, but normally two, heating plates and in at least one but typically two heating ovens within the same cooker.
The heat storage range cooker is well known and has been a product which is known for having qualities which differ entirely from the direct heat style of cooker which use a number of burners each of which are independently controllable. The heat storage range cooker however, uses a single heat source which heat is directed via a heating “barrel” to heat heating plates, typically so that one plate is hotter than the other so that one causes heating or boiling of pans placed on the plate and the other is a simmering plate and at least two ovens, one of which is a baking oven and the other is a simmering oven. A problem with this type of cooker is however that the same are typically bulky, extremely heavy and require a flue to a point external of the premises so that typically the location of the cooker in a kitchen is restricted so as to be close to an external wall and in many instances, the cooker may not even be able to be installed in certain kitchens due the requirement to support the weight of the same. Furthermore, the installation of these type of cookers can be expensive and disruptive.
A further disadvantage is that this style of cooker, if it has been switched off and then subsequently switched on, take a considerable period of time, such as for example 10 to 12 hours to reach the required heat, and this means that either the cooker is switched on permanently for the same to be used whenever required, which is wasteful of fuel and is also uncomfortable in hot days or, alternatively, if the cooker is switched off then a significant degree of pre-planning is required so as to ensure that the cooker is switched on a sufficient time before it is required to be used.
BRIEF SUMMARY OF THE INVENTION
The aim of the present invention is to provide a heat storage range cooker which uses a principle of at least a single heat source but does so in a manner which allows the cooker to heat up within a relatively short period of time so as to allow the same to be switched on and off as and when required and be pre-programmable, and a further aim is to allow the location of the cooker to be selected by the requirements of the user of the cooker rather than by the requirements of the cooker itself.
In a first aspect of the invention there is provided a heat storage range cooker including a heat source mounted within the cooker which creates a heating gas in a cavity and characterised in that from said cavity there depends a first duct leading to a heating plate to channel heat thereto and a second duct leading to a heating oven to channel heat thereto, and said second duct passes along at least the underside and one sidewall of the said heating oven.
Preferably the ducts and hence the heating gas exit to atmosphere at said cooker.
Typically the second heating duct passes round the underside and the side wall of the oven furthest from the heat source and, on the near side wall of the heating oven there is provided a passage into which the heating gas can pass.
Typically the first duct passes to the heating plate and then continues past a second heating plate.
Typically the first and second ducts are arranged within the cooker so as to join together and/or be located so that the exits of the same are adjacent to allow the emission of the heating gas therefrom.
In one embodiment, the underside of the first heating plate is provided with at least one flute so as to aid heat transfer and/or the underside of the second heating plate is provided with at least one flute to improve heat transfer and/or also to determine the flow of the heating gas past the same to improve heating efficiency.
In a further feature the duct leading to the heating plate is also provided with a number of flutes to improve the heat exchange as the heating gas flows therealong.
In a further feature of the invention, there is provided at least one fan in connection with said heating duct or ducts, said fan operated to improve the flow of the heating gas through the same.
In a preferred embodiment, the fan is connected to the ducts so that, when operational, it creates a negative pressure of the gas within the duct. Typically to provide this feature the fan is connection to the exit or exits of the ducts. In an alternative embodiment, a positive pressure of gas is created within the ducts and to create this the fan is typically located at or adjacent to the heat source.
The provision of the fan means that a flue connected to the external equivalent of the premises is not required and so the location of the cooker is no longer restricted as the heating gases can exit directly into the kitchen. The fan acts to suck gases through the cooker and to dilute the products of combustion to below an acceptable level, for example, the products of combustion are reduced to between 2-4 ppm of carbon dioxide. Typically, prior to the exit of the heating gas, the same is mixed with air which has the effect of reducing the flow rate of the gas, to cool the gases before exit and to further dilute carbon monoxide levels.
In a further feature of the invention the side wall and/or the underside wall of the heating oven is provided with a series of flutes to improve the heat exchange and heating of the oven.
Preferably an overheat thermostat is provided in the cooker which can switch off the gas supply to the same in the event of an emergency.
It should therefore be appreciated that the system herein described for heating the heating plates and ovens has been found to allow the heating of the oven to optimum temperature to be achieved within a significantly shorter time than with the conventional heat storage range cooker such as for example the heating of the cooker to the required temperature (i.e. 200° C.) within one hour of being switched on has been found to be achieved. This allows the storage cooker to be provided with the features of pre-programmability inasmuch that the cooker can be programmed to switch on prior to use in a practical fashion so that for example if a person was returning from work and wished to use the cooker upon return, then the cooker can be set to be so switched on. To this end, the cooker can include a programming means to allow the operation of the same to be determined.
In one embodiment the cooker is flueless.
It is envisaged that the invention is of most practical benefit with gas fired cookers whether natural or liquid petroleum gas is used.
A further disadvantage with conventional heat storage range cookers is that the bodies are typically formed from a casting which means that the same are extremely heavy and susceptible to cracking if the strains applied to the same are irregular or in the wrong direction. For this reason it is not possible to fit the same with wheels or rollers which means when the same are installed or moved around a premises they are required to be mounted on wheeled trailers, or in other instances moved over a series of tubular rollers. This is however time consuming, potentially damaging to the cooker and prevents easy movement of the cooker.
In a further aspect of the invention the range cooker is provided with a number of wheels or rollers mounted in a spaced relationship on the underside of the cooker. The wheels are typically mounted at the corners of the underside and typically attached to a steel plate or steel plate portions on the underside of the cooker by any conventional attachment method. The ability to move the cooker using the wheels or rollers means with the steel plate taking up and absorbing any strains due to uneven surfaces without failure means that th
Clarke Sara
Trianco Redfyre Limited
Woodard Emhardt Naughton Moriarty & McNett
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