US3871357A - Self-warming container for precooked foods - Google Patents

Self-warming container for precooked foods Download PDF

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US3871357A
US3871357A US404928A US40492873A US3871357A US 3871357 A US3871357 A US 3871357A US 404928 A US404928 A US 404928A US 40492873 A US40492873 A US 40492873A US 3871357 A US3871357 A US 3871357A
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container
envelope
self
control strip
water
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US404928A
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Vincenzo Grosso
Attilio Grosso
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3484—Packages having self-contained heating means, e.g. heating generated by the reaction of two chemicals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24V—COLLECTION, PRODUCTION OR USE OF HEAT NOT OTHERWISE PROVIDED FOR
    • F24V30/00—Apparatus or devices using heat produced by exothermal chemical reactions other than combustion

Definitions

  • ABSTRACT Lutter Assistant Examiner-Steven L. Weinstein Attorney, Agent, or FirmFinnegan, Henderson, Farabow and Garrett [57] 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.
  • 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.
  • 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.
  • 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.
  • 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;
  • FIG. 4 is a perspective view of the self-warming container of the present invention, rhounted, assembled and closed, ready for use.
  • the self-warming container consists of a receptacle or box 1 of suitable material, such as pressed wood pulp, adapted to be made by moulding.
  • a heat insulating layer 2 of corrugated board or other suitable refractory material 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.
  • an exothermic hydratable chemical reactant such as calcium oxide
  • 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 ofthe box 1, so as to come outside the box in a position ready for use.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a self-warming container 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.
  • 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.
  • a self-warming container 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.
  • a self-warming container wherein the food tray has a movable partition for dividing it into two zones of variable capacity.

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.

Description

United States Patent [191 Grosso et al.
[451 Mar. 18, 1975 I SELF-WARMING CONTAINER FOR PRECOOKED FOODS [76] Inventors: Vincenzo Grosso, 31 Via Felice Casati; Attilio Grosso, 1 Via Appiani, both of Milan, Italy [22] Filed: Oct. 10, 1973 [21] Appl. No.: 404,928
[30] Foreign Application Priority Data Aug. 3, 1973 Italy 27508/73 [52] US. Cl. 126/263, 206/219, 229/51 CE, 426/109, 426/113, 426/120 [51] Int. Cl F24j 1/02, B65b 25/22 [58] Field of Search 126/263; 62/294;
206/219-222; 426/113, 114, 109, 119, 120, 106, 112, 124, 394, 398, 407; 229/51 CE, 51 R, 66, 85; 220/48 [56] References Cited UNITED STATES PATENTS 1,929,599 10/1933 Millholland 229/51 CE 2,373,611 4/1945 Steven 126/263 2,801,930 8/1957 Paulucci 426/113 X 2,850,391 9/1958 Gunsberg 426/113 X 2,994,469 8/1961 Troup et a1 229/51 CE 3,085,681 4/1963 Fazzari 206/222 3,287,140 11/1966 Brussell 426/113 X 3,422,992 l/l969 Brooks et al 206/222 3,638,918 2/1972 Denholtz 206/222 X 3,653,372 4/1972 Douglas 126/263 3,680,689 8/1972 Grundschober et a1, 206/222 FOREIGN PATENTS OR APPLICATIONS 1,214,600 4/1966 Germany 206/222 1,156,334 6/1956 France 426/120 Primary Examiner-Frank W. Lutter Assistant Examiner-Steven L. Weinstein Attorney, Agent, or FirmFinnegan, Henderson, Farabow and Garrett [57] 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.
5 Claims, 4 Drawing Figures PMENIE HAR lama 3.871.357
' saw 1 0r 3 FIG. 1
SELF-WARMING CONTAINER FOR PRECOOKED FOODS 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 1 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 selfwarming 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, rhounted, 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 ofthe 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 solu tion 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.
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.

Claims (5)

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.
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FR2470789A1 (en) * 1979-12-06 1981-06-12 Gradient Storage and liberation of heat - where exothermic hydration of powdered alkaline earth oxide is used to evolve heat
FR2515951A1 (en) * 1981-11-09 1983-05-13 Benmussa Simon Food warmer powered by exothermic chemical reaction - has bags of e.g. slaked lime and water mounted in drawer and ripped as drawer is closed so as to produce reactive mixture
EP0079286A2 (en) * 1981-11-09 1983-05-18 Simon Benmussa Food container with means for triggering a heating process
US4501259A (en) * 1981-12-18 1985-02-26 Tarahelm Limited Device for heating food contained in a sealed container
US4510919A (en) * 1982-11-05 1985-04-16 Simon Benmussa Self heating receptacle
US4529089A (en) * 1984-11-30 1985-07-16 Anthony Gasbarra Food container
US4559921A (en) * 1982-11-05 1985-12-24 Simon Benmussa Self-heating receptacle
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US4771761A (en) * 1985-07-23 1988-09-20 Jacques Doukhan Food receptacle comprising a reheating device by exothermal reaction of two reactive products
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Publication number Priority date Publication date Assignee Title
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