U.S. patent number 3,871,357 [Application Number 05/404,928] was granted by the patent office on 1975-03-18 for self-warming container for precooked foods.
Invention is credited to Attilio Grosso, Vincenzo Grosso.
United States Patent |
3,871,357 |
Grosso , et al. |
March 18, 1975 |
Self-warming container for precooked foods
Abstract
A self-warming container for precooked foods is hereby provided,
of the kind operating by means of an exothermic reaction between
calcium oxide and water, wherein the water required for the
exothermic reaction is contained in a hermetically closed envelope,
opening of which at the moment of use is caused by a cutting blade
being a part of a practically rigid control strip, compelled to
slide in a guide applied on said envelope and to be actuated from
outside the container. The container can be mass produced in an
automated way at low cost and its operation is reliable.
Inventors: |
Grosso; Vincenzo (Milan,
IT), Grosso; Attilio (Milan, IT) |
Family
ID: |
11221793 |
Appl.
No.: |
05/404,928 |
Filed: |
October 10, 1973 |
Foreign Application Priority Data
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Aug 3, 1973 [IT] |
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27508/73 |
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Current U.S.
Class: |
126/263.09;
426/109; 206/219; 426/113; 426/120 |
Current CPC
Class: |
B65D
81/3484 (20130101); F24V 30/00 (20180501) |
Current International
Class: |
F24J
1/00 (20060101); B65D 81/34 (20060101); F24j
001/02 (); B65b 025/22 () |
Field of
Search: |
;126/263 ;62/294
;206/219-222 ;426/113,114,109,119,120,106,112,124,394,398,407
;229/51CE,51R,66,85 ;220/48 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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1,214,600 |
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Apr 1966 |
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DT |
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1,156,334 |
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Jun 1956 |
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FR |
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Primary Examiner: Lutter; Frank W.
Assistant Examiner: Weinstein; Steven L.
Attorney, Agent or Firm: Finnegan, Henderson, Farabow and
Garrett
Claims
We claim:
1. A self-warming container for precooked foods of the kind
operating by means of an exothermic reaction between a chemical
reactant and water disposed within the container comprising a
closed envelope within the container containing the water, an
exothermic hydratable chemical reactant located within the
container for contact with the water when the envelope is opened
and in an amount sufficient to heat the food when contacted with
the water, a cutting blade adapted to open the envelope, a sliding
control strip inside the container supporting said cutting blade, a
guide for said control strip to move said cutting blade over said
envelope, a tongue on said control strip extending outside the
container, said guide for the control strip being a sheet
adhesively secured to the envelope along two lateral zones leaving
an unadhered central zone between the envelope and the guide, said
control strip being situated in said central zone to be held in
contact with the envelope whereby said control strip may be engaged
by its tongue and pulled to move the strip in the central zone and
cause the cutting blade to open the envelope to free the water for
contact with the calcium oxide within the container.
2. A self-warming container according to claim 1, wherein said
chemical reactant is calcium oxide and an inert sheet is suitably
arranged on the container bottom to receive the calcium oxide
required for the reaction and a heat insulating layer is disposed
between the inert sheet and the container bottom.
3. A self-warming container according to claim 1, wherein the
control strip tongue is disposed at the end of the strip opposite
to that where the cutting blade is placed and extends out through a
suitable slot in one side of said container, where it can be
engaged to pull the control strip and open the envelope for the
reaction water.
4. A self-warming container according to claim 1, wherein a tray is
disposed in said container to receive said foods, said tray having
a seam folded to the container edges, the space between said tray
and the container bottom forming a chamber for said reaction and a
cover for closing said container.
5. A self-warming container according to claim 4, wherein the food
tray has a movable partition for dividing it into two zones of
variable capacity.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a self-warming container for
precooked foods which may be manufactured in a completely automated
manner at low price and high output.
2. State of the Art
Self-heating devices are already known, which are based on the
principle of causing an exothermic reaction between water and
calcium oxide, but these devices have complicated structure to
manufacture, high cost and do not always provide a perfect
operation, especially with regard to the system of opening the
capsule containing the water which must be brought in contact with
calcium oxide for starting the exothermic reaction.
SUMMARY OF THE INVENTION
The main object of the present invention is therefore to avoid said
drawbacks and to carry out a self-warming container for precooked
foods of easy construction, rapid automated assembling and reliable
operation, although its manufacturing cost is considerably lower
than that of the presently available devices.
These and other objects of the present invention are obtained by a
self-warming container in which the water required for the
exothermic reaction is contained in a hermetically closed envelope,
opening of which at the moment of use is caused by a cutting blade
being a part of a practically rigid control strip which is
compelled to slide in a guide applied on said envelope and can be
actuated from outside of the container.
The dose of calcium oxide is placed on a sheet arranged on the
container bottom with interposition of a heat insulating layer,
while the foods are placed in a tray fixed to the container and
closing the top of the reaction chamber.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features and advantages of the self-warming
container according to the present invention will be still more
apparent from the following detailed description of a preferred
embodiment, given as a non limiting example only, reference being
had to the accompanying illustrative drawings, in which:
FIG. 1 is an exploded view of the container according to the
present invention, showing the various elements of the device
separated from one another, arranged in the logic sequence of
assembling the container;
FIG. 2 is another exploded view of the water envelope, of its
opening members and of the members guiding the cutting blade;
FIG. 3 is a perspective view of the same elements of FIG. 2 but in
a position assembled on the water envelope; and
FIG. 4 is a perspective view of the self-warming container of the
present invention, mounted, assembled and closed, ready for
use.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference now to the different figures of the accompanying
drawings, the self-warming container according to the present
invention consists of a receptacle or box 1 of suitable material,
such as pressed wood pulp, adapted to be made by moulding. On the
bottom of box 1 and inside it there is a heat insulating layer 2 of
corrugated board or other suitable refractory material, and on the
layer 2 a sheet 3 of aluminum or other suitable material.
In the sheet 3 is then placed a predetermined dose 4 of an
exothermic hydratable chemical reactant such as calcium oxide,
preferably in the granulated form, and then on top of said dose 4
there is a hermetically closed envelope 5 containing water for the
exothermic reaction.
The envelope 5 has a sheet 6 applied on one of the two sides,
preferably the lower one, having two lateral adhesive zones 7 for
application to the envelope and a central zone 8 without adhesive,
which remains detached from the envelope 5 and forms a guiding and
sliding channel for a control strip 9, preferably of practically
rigid plastics, having a cutting blade 10 at one end while the
other end 11 in the form of an actuating tongue is being passed
through a cut 12 provided in one of the short sides of the box 1,
so as to come outside the box in a position ready for use.
Also inside the box 1 is then applied a tray 13, also made of
aluminum foil or other material being a good heat conductor, whose
peripheral edge 14 is mechanically seam folded to the corresponding
edge 15 of the box 1 so as to hermetically close the chamber where
the exothermic reaction will take place. The tray 13 preferably has
a movable partition 16 so as to divide it into two zones where for
instance two different foods or two different courses of a meal
will be placed. The box 1 is then completed by a cover 17 closing
the whole container.
It has to be noted that all the various parts now described may be
made and assembled entirely with machines, so that the container
according to the present invention can be easily produced on a
large scale in an economic and rapid way, so as to allow for the
first time an industrialised production of containers of this
kind.
The self-warming container so made is ready for use, and it will
suffice to pull the tongue 11 for causing the control strip 9 to
slide in the central guide 8 of the water envelope 5, until the
cutting blade 10 will cut and open said envelope 5, whose water
contents being poured on the dose 4 of calcium oxide will cause the
exothermic reaction which will warm in an excellent way the foods
contained in the tray 13, and which could also be taken in the same
tray.
It has to be noted that the tongue 11 engages the whole slot or cut
12 of the box 1, and the strip 9 takes up most of the guide 8, so
that deviations or other incorrect handling are not possible and
therefore opening of the envelope by the cutting blade 10 is
guaranteed. It has also to be noted that the chemical reaction is
strictly restricted to the chamber hermetically closed by tray 13,
so that the container is safe and develops all its calorific power
for warming tray 13.
Therefore it will be understood from what has been described and
illustrated, that the self-warming container according to the
present invention wholly carries out the above mentioned objects,
thus giving the solution to the problem of making an efficient,
safe and economic self-warming container in an automated manner on
an industrial scale.
It is also apparent that many variations, modifications, additions
and replacements of elements may be made to the container according
to the present invention, without departing however from its spirit
and scope nor from its field of protection as defined in the
appended claims.
* * * * *