Improvement in Saucepans, Kettles, and similar Cooking Utensils.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvement in Saucepans, Kettles, and similar Cooking Utensils.
I, WILLIAM HENRY WITHAM, Sanitary Engineer, of 11, Langton Road, Brixton,
in the County of London, do hereby declare the nature of this invention
to be as follows:-
This invention has for its object, to increase the heating efficiency of saucepans,
cooking pots, and similar utensils, so as to save time and fuel.
For this purpose I surround the sides of the saucepan or pot with a concentric
mantle or jacket, which allows the heating gases to rise and remain between
the pan and the jacket, and prevents the cooling of the sides by contact with
cold air.
The mantle is therefore open at the bottom, and extends from a point slightly
above the lower edge of the pan up to or near the top. It may be permanently
fixed to the pan by brazing or rivetting, or it may be detachable, and 'may be
made of the same metal or of a different material, for instance papier mache
impregnated with a solution of water glass or other fireproof substance. The
shape of the mantle may be approximately cylindrical or conical, the upper part
being contracted, so as to form a neck fitting closely to the side of the pan.
The saucepan itself may be cylindrical as usual, or it may be wide at the top,
where it joins the neck of the mantle, and then narrow, so as to afford more
room between the mantle and the pan.
If the mantle is detachable, it may have a rim situated slightly below the
upper end of the saucepan, while the edge of the latter is bent outward, so as
to form a round rim or lip extending over the rim of the mantle and enclosing
the same.
Instead of making the cross section of the receptacle circular, as usual, it
may be corrugated, in order to increase the heating surface, while the cross
section of the mantle is circular.
D
P T
1000
FAIRFAX & WETTER,
Agents for the Applicant.
Improvement in Saucepans, Kettles, and similar Cooking Utensils.
I, WILLIAM HENRY WITHAM, Sanitary Engineer, of 11, Langton Road, Brixton,
in the County of London, do hereby declare the nature of this invention,
[Price 8d.]

page_text: and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:-
-
This invention relates to that kind of cooking utensil, which has a concentric
mantle surrounding the liquid receptacle, into which mantle the heating gases
are allowed to ascend, in order to increase the heating efficiency.
The present improvement has for its object, to increase the efficiency and utility
of the said mantle, so that it will not only save time and fuel in heating or
cooking, but will be still more useful in retarding the cooling of the contents,
after the source of heat has been removed.
This may be effected by completely closing the mantle at the top and extending
it below the lower edge of the liquid receptacle, so that, if the utensil is removed
from the source of heat and placed upon a flat plate having a larger diameter
or width than the mantle, the liquid receptacle will not touch the said plate, but
will be suspended in the mantle and surrounded by an air jacket on the sides-and
at the bottom.
In the accompanying drawings Fig. 1 is a section of a saucepan embodying
my invention; Figs. 2 to 4 represent modifications of the same. A is a liquid
receptacle widened at the top a; B is a cylindrical mantle fitted upon the upper
part a of the receptacle and extending slightly below the lower edge of the
same; bis the annular air or heating jacket formed between the liquid receptacle
and the mantle, said jacket being open at the bottom and closed at the top.
The liquid receptacle may, however, form a straight cylinder, while the mantle
has a narrow neck fitting upon the said cylinder, as represented by Fig. 2, or the
liquid receptacle may be widened at the top, while the mantle is contracted, as
represented by Fig. 3.
In each case an annular heating jacket is formed between the mantle and the
sides of the vessel, and the circumference of the jacket. may be more or less
conical, instead of being cylindrical. The mantle may be permanently fixed to
the pan at the top by brazing, rivetting or other suitable means, or it may be
detachable, and it may be made of the same metal, or of a different material,
preferably a non-conductor of heat, for instance papier mache impregnated with
a solution of alkali-silicate or other non-inflammable substance.
The handle d is preferably fixed to the mantle, as shown by the drawing, but
it may be fixed to the liquid receptacle as usual, in which case the mantle has a
short vertical slot or other opening for allowing the handle to pass.
For heating such a utensil, it is placed upon an open frame or grating, so
arranged, that the gases of combustion from a gas burner or other source will
touch the bottom of the receptacle A and then either rise into the jacket b or
escape underneath the edge of the mantle B.
For keeping the contents of the receptacle A warm, after heating has ceased,
the utensil is placed upon a flat plate Û of a diameter greater than that of the
mantle B, so that the plate, touches the edge of the mantle all round, but not
the bottom of the receptacle A, and the latter is protected from cooling by an air
jacket on the sides and at the bottom, as indicated by Fig. 2.
am aware that it has been proposed to make heating and cooking utensils
provided with a perforated mantle extending below the bottom of the liquid
receptacle, the perforations being either at the top or in the side of the mantle,
and I do not claim such utensils.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. The combination of a liquid receptacle with a mantle surrounding the re-
ceptacle concentrically so as to form an annular air jacket, open at the bottom
only, the said mantle being secured to the receptacle at the top and extending
below the bottom of the same, substantially as described, and for the purpose
specified.

page_text: 2. The combination of a metallic liquid receptacle with a mantle of non-con-
ducting material, such as papier mache impregnated with a solution of non-in-
flammable material, the said mantle being secured to the receptacle at the top and
surrounding it concentrically, so as to form an annular air jacket open at the
bottom only, substantially as described and for the purpose specified.
Dated this 17th day of June 1898.
FAIRFAX & WETTER,
Agents, 37 and 39, Essex Street, Strand, London.