Stoves and furnaces – Liquid heater – Open-top vessel that may include lid
Reexamination Certificate
2000-09-11
2001-11-06
Clarke, Sara (Department: 3743)
Stoves and furnaces
Liquid heater
Open-top vessel that may include lid
C126S040000, C126S265000
Reexamination Certificate
active
06311686
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a cooking apparatus comprising
a burner
an upwardly extending cylindrical casing in the lower part of which is a radially inwardly projecting, first contact portion and in the upper part a first edge,
a cylindrical cooking vessel which has a bottom, a side wall which extends upwardly from the bottom, and in the upper part has a radially outwardly projecting, second contact portion, the bottom and the side wall defining a space in the vessel, and
a lid with a peripheral portion which is arranged to rest on the cooking vessel's second contact portion, where
the casing's first contact portion is arranged to rest on the burner, and the casing is arranged to enclose the cooking vessel's side wall in such a manner that between the casing and the cooking vessel there is formed a gap,
the cooking vessel's second contact portion is arranged to abut against the casing's first edge, and
at the point where the cooking vessel's second contact portion abuts against the casing's first edge there are provided radially extending openings via which the gap can communicate with the space outside the casing when the cooking vessel is disposed in the casing.
BACKGROUND OF THE INVENTION
From U.S. Pat. No. 2,756,738 there are known cooking apparatuses or kits of the above-mentioned type where the hot gas which is provided by the burner is caused to flow upwards between the burner and the bottom of the vessel and radially outwards therefrom along the bottom towards the lower portion of the casing. This lower portion of the casing deflects the gas there, thus causing it to flow up through the gap between the cooking vessel and the casing and out into the ambient open air through openings in the casing's upper portion. The object is thereby achieved that the heat energy in the gas is exploited to a great extent for heating the contents of the cooking vessel. However, the casing is made of a thin metal sheet and emits a large amount of heat radiation.
From the prior art it is also know that the casing is made of metal and has double walls which define an annular space wherein a heat-insulating material may be placed.
When using the cooking apparatus the object is thereby achieved that the temperature of the casing's outer surface may be low and that the casing emits only a small amount of heat radiation which may betray its position, a factor which can be important in military use of the cooking vessel, but the double metal walls cause the cooking apparatus to be relatively heavy. The lid closes the cooking vessel at the top.
SUMMARY OF THE INVENTION
The advantages of the invention are that
the lid has a hole via which the space in the cooking vessel can communicate with the space above the lid, and between the peripheral portion of the lid and the second contact portion of the cooking vessel there extend passages via which the space outside the casing can communicate with the space in the cooking vessel when the lid is placed on the cooking vessel,
and the cooking apparatus further comprises a tubular jacket of a fireproof, flexible material, which is arranged to extend over the lid and with clearance relative to and outside the casing, and which has a lower opening whose edge is arranged to sealingly enclose a lower portion of the casing, and an upper opening whose edge is arranged for sealing connection with the edge of the lid's hole.
The object is thereby achieved that at the gap between the casing's side wall and the jacket there is formed an insulating air space which provides heat insulation, thus causing the jacket's temperature to be low when the cooking apparatus is in use and thus enabling the wall of the casing to be formed by a single plate, thus reducing the cooking vessel's weight, since the jacket can be relatively light.
The object is further achieved that the hot gas which has flowed upwards along the cooking vessel and the casing and radially out through the openings at the point where the cooking vessel abuts against the casing can flow radially inwards through the openings between the peripheral portion of the lid and the upper edge of the cooking vessel, under the lid and out through the hole in the lid.
The heat energy of the gas which flows radially outwards through the openings at the contact point between the cooking vessel and the casing is thereby utilised for further heating of the contents of the cooking vessel before the gas finally flows out through the hole in the lid.
If the burner is sufficiently small relative to the cooking vessel, it can be placed after use in the cooking vessel, the jacket being tied round the cooking vessel, thereby keeping the components of the cooking apparatus together.
If the lid is in the form of an upwardly open vessel with a bottom and extending from a circumferential portion thereof a cylindrical side wall with a second upper edge, where the hole is provided in the bottom and from the hole there extends upwardly a pipe connected with the bottom sealingly round the hole, the length of which pipe is at least as great as the height of the lid's side wall, and the bottom comprises the peripheral portion which is arranged to abut against the cooking vessel's second contact portion, the edge of the jacket's upper opening being arranged to sealingly enclose the pipe's upper portion, the lid can also be utilised for, e.g., heating of food or thawing of ice, etc.
REFERENCES:
patent: 2154305 (1939-04-01), Goerl
patent: 2756738 (1956-07-01), Kratz
patent: 3140740 (1964-07-01), Lagreid et al.
patent: 5408987 (1995-04-01), Mifune et al.
patent: 5513623 (1996-05-01), Hong
patent: 5651356 (1997-07-01), Kaines
patent: WO 93/05344 (1993-03-01), None
Clarke Sara
Young & Thompson
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