CA1061587A - Double-walled cover for cooking food - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE

A cover for cooking food located over a heat source has an outer dome-shaped wall and an inner dome-shaped wall within the outer wall and spaced therefrom by spacers secured to each wall. The inner and outer walls are imperforate and have lower edges which are substantially horizontally aligned, thereby forming a space between the inner and outer walls which is open only at the lower edges. In use, hot air from the heat source and from within the inner wall can pass into the space between the walls at the lower edges and be retained in the space.

Description

This invention relates to apparatus for cooking food, and more particularly to a double walled cover~
It is an object of this invention to provide a movable double-walled cover which can readily be placed over a burner or heat element.
Another object of the lnvention is to provide a double-walled cover for cooking whether it is placed withln a vessel or upon a grill placed on a metallic plate positioned directly over a burner or other heat source.
According to the invention/ a cover has an outer dome-shaped wall and an inner dome-shaped wall within the outer wall and spaced therefrom by spacers secured to each wall, the inner and outer walls being imperforate and having lower edges which are substantially horizontally aligned, thereby forming a space between the inner and outer walls which is open only at the lower edges such that, in use, hot air from the heat source and from within the inner wall can pass into the space between the walls at the lower edges and be retained in said space.
Each wall may comprise a metallic layer covered by an outer layer of insulating material. Each wall may also have an outer metallic layer covering the layer of insulating material to form a sandwich construction.
The cover may also include a container with a lid, the lid being located within and being secured to an upper part of the inner wall.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, of which:-Figure 1 is a side view, partly in section, of a cover according to one embodiment, .,~

,, Figure 2 is a sectional vlew along the line 2-2 of Figure 1, Figure 3 is a sectional side view of a cover according to another embodiment in which the inner wall of the cover is secured to the lid of a ~ettle, with each wall having an insulating layer, and - Figure 4 is a view similar to that of Figure 3, with the kettle lid removed, and wherein each wall consists of a sandwich with a metallic double layer having an intermediate insulating layer~
With reference to Figures 1 and 2, a cover 11 has an outer dome-shaped wall 12 and an inner dome-shaped wall 13 separated by spacers 14 secured to the walls 12, 13 to define an outer chamber 15 and an inner chamber 16 open at their lower edges. The ~alls 12, 13 are imperforate, that is to say have no openings other than the openings at their lower edges, which are hori~ontally aliynedO The cover 11 pxevents hot air from escaping from the vicinity of a burner 17, which can directly heat a vessel containing food or heat a metallic plate 18 placed over the grating 1~ of burner 17, which can be that of a domestic -~stove or the like having a grill 20 placed upon said metallic ~ plate 18 for braising meat. Because the hot air tends to rise, the air escaping from the inner chamber 16 ~round its lower edge 21 as well as the hot air coming from heated metal plate 18 is admitted through opening 22 into the inside of chamber 15 formed between the two walls 12 and 13 of cover 11. When the outer - chamber 15 is full of hot air, the escape of hot air from inner chamber 16 away from cover 11 is more efficiently impeded, 50 that the food placed inside the cover can cook more easily and ,~ . .

,- :: - :.:, : . :. , . -, - ; . . . .. - .

5~
rapidly, with consumption of only a small amount of fuel which is considerably less than that required for cooking the food without cover 11.
In addition, because of the thermally insulating action of the cover, the user can approach the place where the foods are being cooked without the discomfort of undesirable high tempera-tures.
For manipulation of th~ cover, a knob 23 is provided so the user can put on or take off the cover at will.
Walls 12 and 13 may be made simply of metal sheet as illustrated in Figure 1, or alternatively they may include a layer 24 of thermal insulat.ion as illustrated in Figure 3, which pre-ferably is applied to the outer side of the walls in order to permit cleaning the inside of cover 11 easily.
Alternatively each of the walls of cover 11 may, as illustrated in Figure 4, be composed of a sandwich of three layers, two external metallic layers 25 and one intermediate insulating layer 26.
These different possibilities for construction of the walls of the cover are illustrated by way of example to indicate that selection may be made of any one of these dispositions of : layers. An importa~t feature of this double cover is that the space between walls 12 and 13 is open at the bottom 22 of cover - 11.
In Figures 3 and 4, an embodiment of the cover 11 is illustrated in which the walls 12, 13 are attached by means of a screw 27 and an adapter 28 to lid 29 of kettle 30, in such a manner that the lower edges 21 of the cover 11 are at the same - level as the bottom wall 31 of kettle 30. Screw 27 may be the ; 30 sam~ one which secures knob 23 for manipulating the cover.

~- _ 3 _ ,,~ .:. . : . ,:
,, ,. . ,......... ,, :, "

S1~7 In the foregoing embodiment, cover 11 is joined to kettle lid 29 so that, when the user has occasion to inspect the food contained inside chamber 16, heat without the cover is not entirely lost, and furthermore the user does not need to remove cover ll first and then lid l9 to the kettle 30, but does it all in one move.
Other embodiments within the scope of the invention will be readily apparent to a person skilled in the art, the scope of the invention being defined in the appended claims.

.

~ ~ ,

Claims (4)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A cover for cooking food located over a heat source, said cover having an outer dome-shaped wall and an inner dome-shaped wall within the outer wall and spaced therefrom by spacers secured to each wall, the inner and outer walls being imperforate and having lower edges which are substantially horizontally aligned, thereby forming a space between the inner and outer walls which is open only at the lower edges such that, in use, hot air from the heat source and from within the inner wall can pass into the space between the walls at the lower edges and be retained in said space.

2. A cover according to claim 1, wherein each wall comprises a metallic layer covered by an outer layer of insulating material.

3. A cover according to claim 2, wherein each wall also has an outer metallic layer covering the layer of insulating material to form a sandwich construction.

4. A cover according to claim 1, claim 2 or claim 3, also including a container with a lid, the lid being located within and being secured to an upper part of the inner wall.