Stoves and furnaces – Stoves – Cooking
Reexamination Certificate
2000-01-12
2001-02-06
Lazarus, Ira S. (Department: 3743)
Stoves and furnaces
Stoves
Cooking
C431S247000, C431S156000, C431S344000
Reexamination Certificate
active
06182651
ABSTRACT:
FIELD OF INVENTION
The present invention relates to open air stoves that use connectable fuel sources.
BACKGROUND OF THE INVENTION
These open air stoves either use gaseous fuels such as bottled gas for instance, which is a mixture of propane and butane, or some other type of liquid fuel, such as paraffin, ethanol, diesel, methanol or gasoline. Stoves that use bottled gas must be of an approved type, and must fulfil certain requirements with respect to temperature values and emission values in order to be approved. Stoves that have been constructed for liquid fuels do not have to meet corresponding requirements, and hence construction of such stoves has been directed solely towards either gas-fired stoves or solely towards stoves that are fired with liquid fuels. A stove that has been constructed for bottled gas is not suitable for use with paraffin, since the stove has been constructed with a starting point from a liquid fuel source. The type of fuel source for which the stove is constructed controls geometries with respect to vaporisation loop, fuel pipe diameters, nozzle design, the diameter of the nozzle orifice, air holes, etc.
It might be possible to use a stove designed for gaseous fuels with the aforesaid liquid fuels as a fuel source, provided that certain modifications were made with respect to coupling of of the fuel sources, although this would result in a very large difference between the power generated by the stove when using liquid fuel that has a high air requirement (paraffin, diesel) and when using bottled gas, and the stove would be very difficult to ignite. Consequently, a modified construction of this kind is completely uninteresting to the user. From a user aspect, a stove that is operated on gaseous or liquid fuels will preferably be able to heat 1 liter of water to a temperature of 20° C. in a maximum of 3-4 minutes, regardless of the type of fuel used. The stove shall also be compact, so as to enable it to be tucked away in a small space, and will also achieve complete combustion as far as possible, so as to avoid sooting.
OBJECTS OF THE INVENTION
One object of the invention is to provide a stove that can be used either with gaseous fuels, such as bottled gas, or with paraffin, diesel, alcohol or gasoline . Another object is to provide such a stove that also fulfils the requirements laid down with respect to official approval of the type of stove concerned, and user requirements with respect to efficiency, flexibility, function, size and cleanliness.
SUMMARY OF THE INVENTION
In order to provide a stove which satisfies these objects, there is required a special combination of geometries in a special design of the stove, which means in the present case a unique combination of diameters on a cylindrical inner cup and diameters on a cylindrical outer cup, in combination with the diameter of the burner nozzle orifice. These geometries and special means for connecting different fuel sources constitute the present invention as defined in the following Claims.
REFERENCES:
patent: 1947194 (1934-02-01), Engh
patent: 2469185 (1949-05-01), Tullis
patent: 2478364 (1949-08-01), Bramming
patent: 2538538 (1951-01-01), Stempel et al.
patent: 5803727 (1998-09-01), Long
patent: 2807922 (1979-08-01), None
patent: 3718994 (1988-12-01), None
patent: 3900333 (1990-05-01), None
patent: 1293662 (1962-04-01), None
patent: 97424 (1939-11-01), None
Clarke Sara
Lazarus Ira S.
Primus AB
Rockey Milnamow & Katz Ltd.
LandOfFree
Open air stove does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Open air stove, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Open air stove will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2581695