Appliance for Heating Objects, more particularly applicable to Tins Containing Preserves.
Year: 1898

page_text: Date of Application, 27th May, 1898
Complete Specification Left, 15th Feb., 1899-Accepted, 25th Mar.,
1899
PROVISIONAL SPECIFICATION.
Appliance for Heating Objects, more particularly applicable to Tins
Containing Preserves.
I, FRIEDRICH SCHINDLER, of I. Wildpretmarkt. No. 10, Vienna, Austria,
Purveyor, do hereby declare the nature of this invention to be as follows:-
This invention relates to an appliance for heating objects, more particularly
tins containing preserves, without the use of fire heat.
One arrangement of the said appliance is shewn in vertical section at Fig. 1 of
the accompanying drawings and in part sectional plan at Fig. 2; Figs. 3 and 4
shew respectively a vertical section and part sectional plan of another arrangement.
Referring to Figs. 1 and 2 the appliance consists of a casing A with hollow
walls and bottom, the spaces H H in which are filled with caustic lime, with which
may be mixed fragments of earthenware or other bad conductors of heat.
Into the top of the hollow space H is fitted an annular receptacle C filled with
water which is separated from the lime by the bottom b of the receptacle C. Over
the latter is fitted a cover d hermetically closing the same and consequently also
the hollow space H.
After filling in a charge of caustic lime the air is exhausted therefrom by a
pump connected to a small pipe G which is then closed by soldering.
If now a nail or the like be driven into the cover d at the place marked a so
as to penetrate through the bottom b, the water will flow from C into the lime
contained in the spaces H and the resulting slaking of the lime will cause a con-
siderable development of heat.
The heat thus produced can be utilised in various ways, but mainly for heating
food and the like.
If for example the casing A is formed as shewn at Figs. 1 and 2, with a hollow
cylindrical wall surrounding a central space open at top, the central space may serve
to receive a tin B, containing preserved food of any description, whether solid
or liquid, which on the piercing of the cover and slaking of the charge of lime will
be effectually warmed by the heat generated.
The said appliance might of course be formed in one with the tin of preserves,
the cover D of the latter being extended so as also to constitute the cover of the
hollow space H of the receptacle A, the inner walls of which would then form the
walls of the preserve tin.
In the modification shewn at Figs. 3 and 4, the cylindrical receptacle A has
its space divided by transverse partitions bb into three chambers HCH of which
the two outer ones are filled with caustic lime while the middle one is filled with
water. On piercing the cover d and partitions bb the water will pass among the
lime, so as to generate heat. The receptacle can in this case be introduced into a
vessel B containing the food &c. to be warmed, or the vessel B may be formed in
one with the receptacle A, the outer wall of the latter constituting the inner wall
of the annular vessel B, and the covers D and d being formed in one.

page_text: one with the receptacle A, the outer wall of the latter constituting the inner wall
of the annular vessel B and the covers D and d being formed in one.
The exhaustion of the air from the lime chambers H and the hermetical closure
are necessary in the above appliance in order to prevent the formation of calcium
carbonate, and the penetration of carbonic acid and aqueous vapour to the lime.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. Appliance for heating objects, more particularly tins containing preserves,
consisting of a hermetically closed casing such as A divided by partitions into
separate compartments such as CH, of which the one is charged with caustic lime
mixed with pieces of earthenware, while the other is charged with water, so that
on piercing the said partition, the water will penetrate among the lime, and, in
slaking the same will produce heat which is transmitted to the substance contained
in a receptacle such as B with which the casing A is in contact substantially as
described.
2. In an appliance such as is referred to in the first claim, combining the
casing A and the receptacle B for the material to be heated, in one piece, the two
vessels having a cover D d common to both, and the outer wall of the one vessel
being made to constitute the inner wall of the other one which is of annular
cross section, substantially as described.
Dated this 15th day of February 1899.
ABEL & IMRAY,
Agents for the Applicant.