WO2007030903A1

WO2007030903A1 - Oven with adjustable inner volume

Info

Publication number: WO2007030903A1
Application number: PCT/BR2006/000184
Authority: WO
Inventors: Treméa EMERSON GIL
Original assignee: Emerson Gil Tremea
Priority date: 2005-09-12
Filing date: 2006-09-11
Publication date: 2007-03-22

Abstract

Oven with adjustable inner volume comprising a cavity having a separating plate (R) or shell (C) which can be inserted horizontally in the cavity in order to split it in two sub-cavities.

Description

Oven with adjustable ceiling inner volume

This system allows the adjustment of the oven cubic inner volume, reducing the power needed for its heating. Although there are a lot of ways to change the volume of the oven, the simplest is to move the ceiling allowing the adjustment of its height.

The aim of this useful model patent is to save the power (electrical or gas) used to heat ovens with electric resistances or burners, preferably embedded ones as it reduces the inner volume of the oven. On the current system, used in the the main part of commercial and domestic ovens, we easily note the unecessary waste of energy due to, on its normal use, it is necessary to heat the whole air present in the oven even to heat or roast small meals. Only after warming up the air the product will be heated and this leads to a great waste of power mainly if the product we want to warm up is of a small quantity.

In a very simple form, adjustment of the oven's ceiling may be similar to the grills existing on the current gas stoves enabling an easy handling and implementation. On the other hand it enables us to add any other system that allows arising or lowering the oven's ceiling even if this requires other technologies as, for example, through engines that allow the automatic adjustment of the ceiling.

On the simplest system, to adjust the required height, just open the oven door, pull out its ceiling completely and put it back in the desired height according to your necessity and the grooves and guidelines available. Those guidelines or grooves can be the same used to support the adjustment of the height of the oven grills. The removable ceiling can be built into the guidelines of the grooves or also can be just put on them.

The quantity of guidelines, grooves or tubes to adjust the ceiling of the oven(s) grill(s), will remain as per the manufacturers point of view. Another positive point on the present system is that the total volume of the ovens maybe amplified because, nowadays, the stoves on market are designed by the average size of the baked food, to optimize the cost and benefit of the power used to heaten the oven. Therefore we have the medium size of "standardized" ovens.

In the case of adjustable volume oven, this standardization of medium ovens will not be necessary anymore, due to we will have the possibility to have an oven which can fit two turkeys or roast a pizza, without the waste of energy and the only needing is to adjust the ceiling accordingly.

The adjustable ceiling may be straight (R) or curve

(C). However a curve ceiling will give a better distribution of heat at its minimum volume. Once the oven cubic inner volume is reduced, the power used to heat it is also reduced. Moreover, the heat will become much more concentrated and will bake or roast faster, even with a lower flame.

For example: to bake a cake in a baking tray of 4.32 liters, it is necessary to heat an oven of 63 liters. The baking tray will occupy a little more than 6% of the oven volume. However, if it is possible to lower the oven volume to 15 liters, the same baking tray will occupy more than 28 % of the oven. Therefore, a lot of power will be saved.

The drawings attached herewith show how this device can be used in a more simple way, by changing the oven ceiling height. The manufacturing of the oven with adjustable straight ceiling (R) or curve ceiling (C) will be as per the manufacturer's point of view.

Drawing 1 - Adjustable Oven Ceiling (R) at maximum level. Drawing 2 - Adjustable Oven Ceiling (R) at intermediate level. Drawing 3 — Adjustable Oven Ceiling (R) at minimum level.

Drawing 4 — Adjustable Oven Ceiling (C) at maximum level. Drawing 5 — Adjustable Oven Ceiling (C) at intermediate level Drawing 6 - Adjustable Oven Ceiling (C) at minimum level

The adjustable ceiling can be fixed on the guidelines or fit in concave guidelines, convex guidelines, grooves or path tracks. On the attached drawings, convex guidelines have been used, because this is a simple and efficient system and the guidelines to move the oven grills are common used on current ovens.

Another sliding material can be used for a better sliding of the ceiling on the guidelines, grooves or path tracks. To improve the thermal blockade on the edge between the ceiling and the lateral of the oven, rubber can be used. The adjustable ceiling of the oven can be manufactured on several materials: metal, ceramic, fiber-cement, glass, etc... as per the manufacturers criteria.

This system could also be used in ovens where the burners are located on the ceiling. In this case, there should be an adjustable bottom. The cubic inner volume can also be changed by adjusting the sides, the back, or even the oven door. However, it would imply a different engineering design, which would not be economically viable.

The inner illumination for this type of oven must suffer changes to be efficient. This may be fluorescent through a glass plate tightly blockaded on vertical position, that may be situated on the back, laterals or even on the oven door. Another possibility is to use incandescent or halogen lamps fixed on the adjustable ceiling. This may require electrical contact on the point of joining between the back and the ceiling or a flexible cable to join. However, this will compromise the electrical safety of the product. If case of the ceiling is made on transparent glass, the lamp may continue fixed, similarly we use at current ovens.

The window in the oven's door must have a wider vertical opening to enable the inner view in all adjustments of the ceiling and oven grills. As to the temperature of the oven for each position of the ceiling shall have significant alteration, the adjustment button of the oven may contain scales indicating the near temperature in all positions (BUTTON x CEILING).

For example: picture 7 contains 3 scales, one for each position of the ceiling, and five positions of button temperature, being the internal scale (the closest to the button) is suitable for the maximum volume oven (high ceiling), the scale in the middle is suitable for the intermediate volume oven (intermediate level ceiling) and the external (the farthest from the bottom) is suitable for the minimum volume oven (ceiling on the lowest position).

In addition to the three scales around the regulator button there may be a diagram besides the button relating the scales for a better understanding of its functioning. The relationship among the scales and the diagram may be made using colors, letters or figures. For example: for the ceiling on the maximum position (picture 8A) we may use yellow color, on medium position

(pictureδ B) we may use orange and on minimum position (picture 8 C) the red color.

These colors are, respectively, used on inner, intermediary and external rings. With figures and letters the relationship will continue similar, changing only the colors instead of these indications.

For electrical ovens with lower resistance, the temperature will be adjusted by thermostat and the diagrams described above will not be necessary, hi this case, the advantage is given through lesser energy waste and the results are the same.

To facilitate the removal of the ceiling, there may be a puller that may be a furrow on its external extremity of the lower side or on both sides.

The furrow may be built on the stamp of the piece (picture 9 A), and to do so you must tighten your hand when handling. This puller may form the chimney foreseen for this system (picture 9 B).

For the exhaust of gas generated on the inner burning of gas, it will be necessary to have a chimney. This chimney may be formed by a slit in any of the extremities of the ceiling or by holes on the ceiling. As above mentioned, the puller (picture 9B) may also be enabled to this, but it has to let the gas pass from one side to the other and to the upper compartment of the ceiling and afterwards being thrown out by another chimney, commonly found on the upper part of the back of the oven.

As the temperature generated will increase a lot, mainly on the minimum level, the insulation glasswool at the side of this region may suffer structure alterations. To avoid this, it may be necessary to use other methods of thermal isolation. A very efficient method is formed of an air elevation curtain between the external wall and the insulation glasswool of the oven. This way the heat generated and concentrated on the lower external part of the oven, through the air elevation curtain, will arise and be thrown out on the back of the oven. Another method is to separate the insulation glasswool from the external wall of the oven, This way, the concentrated heat that remains on the lower part will be simply distributed on all external laterals of the oven, avoiding the deterioration of the insulation glasswool on regions on the oven of major heat incidence.

In the case of electric ovens, the temperature will not will be the same, only the power consumption will change so we do not need thermal insulation alteration.

Claims

Claim

Featured by its adjustable volume that may be adjusted according to what one desires to heat, aiming power saving and time saving. The system runs through adjustment of the height of the ceiling of the oven, and maybe handled by any person without special skills. The ceiling maybe straight (R) or curve (C) for a better distribution of the heat. To fix the ceiling on the desired height the already existing guidelines for the movement of the oven grills can be used. The material used to manufacture the ceiling will be on the manufacturer's criteria. The ceiling also consist of a system of exhaust of gas, the puller, a different illumination system, a system for a better sliding of ceiling and, if necessary, of a system of thermal insulation.