The present invention generally relates to containers. The invention particularly relates to container assemblies configured to heat and cool contents stored therein for a period of time.
Individuals commonly prepare food at home and then transport the food to another location for consumption, such as another individual's home or an event such as a potluck dinner, sporting event, etc. Food may be prepared in, for example, a baking dish, and then transported in a different container or, in some cases, transported in the same dish by placing a cover over the dish, as examples, a lid or a disposable material such as metal or plastic foil. Foods are often preferably served at a reduced or elevated temperature relative to room temperature, and conventional methods of containment and transportation often fail to adequately maintain preferred food temperatures. Consequently, access to electrical power is often needed or at least desirable to supply power to equipment capable of maintaining a desired temperature for the food during transport, and/or to re-warm or re-chill the food once at the intended destination.
In view of the above, it would be desirable if means and methods were available for sealing and maintaining desired temperatures of food during transport without requiring access to electrical power.
The present invention provides container assemblies and methods suitable for cooking, transporting, and storing the contents of the container assemblies while simultaneously maintaining the contents therein at a desired elevated or reduced temperature.
According to one aspect of the invention, a container assembly is provided that includes a container having a lower wall that defines a base of the container, side walls connected to the lower wall, and an opening opposite the lower wall that provides access to a cavity defined by the lower wall and the side walls. The container assembly further includes a lid configured to releasably attach to the side walls and thereby enclose the cavity to define a storage compartment. A thermal mass is coupled to an interior side of the lid such that at least a portion of the thermal mass faces and is exposed to the storage compartment when the lid is attached to the container. The thermal mass is configured to be heated to an elevated temperature or cooled to a reduced temperature and maintain the elevated or reduced temperature for a period of time.
According to another aspect of the invention, a method of heating or cooling the contents of a container over a period of time uses a container having a lower wall that defines a base of the container, side walls connected to the lower wall, and an opening opposite the lower wall that provides access to a cavity defined by the lower wall and the side walls. A lid is provided that is releasably attached to the side walls of the container and thereby enclose the cavity to define a storage compartment. The method further includes heating or cooling a thermal mass to a predetermined temperature, securing the thermal mass to an interior side of the lid once the thermal mass reaches the predetermined temperature, attaching the lid to the container such that at least a portion of the thermal mass faces and is exposed to the storage compartment, and warming or cooling the contents of the container assembly within the storage compartment with the thermal mass for the period of time.
Technical effects ofthe container assembly and method described above preferably include the ability to maintain an elevated or reduced temperature within the storage compartment ofthe container assembly in order to better maintain the temperature ofcontents within the storage compartment over time without requiring access to electrical power.
Other aspects and advantages of this invention will be appreciated from the following detailed description.
To facilitate the description provided below of the embodiment represented in the drawings, relative terms, including but not limited to, “side,” “upper,” “lower,” “above,” “below,” etc., may be used in reference to an orientation of the container assembly 10 during its operation, and therefore are relative terms that indicate the construction, installation and use of the invention, but should not be necessarily interpreted as limiting the scope of the invention. Further, although the container assembly 10 is described as adapted for storing food, it is not limited to such and could be used to store and transport various materials.
In a first embodiment represented in
The lid 14 is a generally planar body configured to releasably couple to the upper edges of the side walls of the container 12 so that the lid 14 encloses the cavity defined by the container 12, particularly its side walls and base wall, and an interior side of the lid 14 faces the cavity of the container 12. In this nonlimiting embodiment, the lid 14 is represented as an assembly that comprises a base member 15 primarily on and forming an exterior side of the lid 14, and pivoting clasps 16 on at least two opposite ends of the base member 15 for securing the lid 14 to the container 12 by grasping below a lip 13 along upper edges of the side walls of the container 12 (
In
To secure the thermal mass 20, the interior walls 24 comprise one or more elements or projections 26 along their upper edges that extend inward into and/or over the lid compartment 25. In the nonlimiting embodiment shown, the projections 26 are in the form of a continuous lip along the upper edges of the walls 24 so that, when the thermal mass 20 is located in the lid compartment 25, the projections 26 overlap edge portions of the thermal mass 20 that are along the perimeter and on the surface 21 of the thermal mass 20. Preferably, the projections 26 define an interior perimeter of the opening to the compartment 25 that is smaller than the outer perimeter of the thermal mass 20, and the interior walls 24 and/or projections 26 are formed of one or more materials that are sufficiently pliable to elastically deform to allow the interior walls 24 and/or projections 26 to expand outwardly from the compartment 25 and permit the thermal mass 20 to be inserted into the lid compartment 25 and secured therein with the projections 26, as well as completely removed from the compartment 25, as represented in
During use of the container assembly 10, food may be prepared in the container 12 or may be prepared in another container and then transferred to the container 12. The thermal mass 20 is preferably preheated or precooled to a desired temperature before being inserted into the lid compartment 25. The lid 14 may then be secured to the container 12 to cover and seal the food within the container assembly 10. While sealed, the thermal mass 20 preferably helps to maintain the internal environment of the container assembly 10, including any food therein, at or near the temperature of the thermal mass 20. Heat transfer between the thermal mass 20 and the interior of the container 12 is promoted by the relatively large portion of the mass 20 that lies beneath its surface 21, which in turn is directly exposed to the interior cavity ofthe container 12. In this manner, a desired or acceptable elevated or reduced temperature relative to the surrounding environment can be maintained for a period of time that is longer than would be possible without the thermal mass 20. This enables the food stored in the container assembly 10 to be kept at a relatively warm or cool (as desired) without access to electrical power. Exemplary steps in this method are represented in
Since it is desired that the thermal mass 20 maintains an elevated or reduced temperature within the container assembly 10 for an extended period of time, the thermal mass 20 is preferably formed of a material having a relatively high thermal capacitance and has a relatively high mass relative to the container 12 and a relatively high volume relative to the volume of the interior cavity of the container 12. The thermal mass 20 also benefits from having a relatively low thermal conductivity to inhibit heat transfer between the contents within the storage compartment and the exterior side of the lid 14. For this purpose, preferred materials for the thermal mass 20 include synthetic and naturally occurring rock and ceramic materials. Suitable but nonlimiting materials include soapstone, granite, gypsum, basalt, marble, limestone, sandstone, or firebrick.
As noted above, the thermal mass 20 should have a sufficient mass relative to the size (volume or area) of the container 12 in order to keep the contents of the container 12 at a desired temperature over a targeted period of time. As a nonlimiting example, the thermal mass 20 may be approximately 60 to 70 percent of the overall width/length/height of the lid 14. Relative to the container 12, the thermal mass 20 may be about 12.5 to 15 percent of the depth of the container 12. For the 9×13 inch baking dish represented in the drawings, the thermal mass 20 is preferably between 0.3 to 0.5 inches (0.1 to 0.2 cm) in thickness. Although the thermal mass 20 is represented as having smooth surfaces in the drawings, it could alternatively include surface features configured to modify thermal transfer, such as ridges or recesses on its surface 21.
The lid 14, its components, and the thermal mass 20, may be formed of materials capable of being maintained and used in a wide range of temperatures both above and below room temperature. In one nonlimiting embodiment, the thermal mass 20 is a slab of soapstone, the base member 15 of the lid 14 is formed of a relatively rigid plastic such as polypropylene, and the lining 23 attached to the base member 15 or at least its interior face 22 and walls 24 is formed of an elastic material such as silicone. The lining 23 preferably serves as a thermal barrier lining for the assembly 10, and for this purpose the lining 23 covers most if not all portions of the lid 14 that are on the interior side of the lid 14 and therefore within and facing the interior cavity of the container 12 when the lid 14 is installed on the container 12. By also covering the base member 15 within the lid compartment 25, the lining 23 also provides a thermal barrier between the thermal mass 20 and the exterior side of the lid 14. When the lid 14 is secured to the container 12, the gasket 18 and the lining 23 act to thermally and fluidically seal the storage compartment of the assembly 10 formed at least in part by the cavity of the container 12. In such an embodiment, the thermal mass 20 may have a mass of approximately 400 to 500 grams with a volume of about 400 to 500 cubic centimeters.
In addition to maintaining reduced or elevated temperatures within the sealed container assembly 10, the lid 14 and thermal mass 20 may be used to maintain desired temperatures while food is being served. For example,
In view of the above, the container assembly 10 is suitable for use in cooking, transporting, and storing food, and may be particularly useful for foods that are intended to be cooked at a first location and transported to a second location for consumption. For example, an individual could bake food in the container 12 in an oven at home and separately or simultaneously heat the thermal mass 20 in the oven. Once heated, the thermal mass 20 may be assembled with the lid 14 (i.e., secured in the lid compartment 25) and then the lid 14 secured to the container 12 to enclose and seal the cooked food within the cavity of the container 12. As the user transports the container assembly 10 to another location, the container assembly 10 helps to maintain the food at an elevated temperature. Once it is time to serve the food, the lid 14 may be placed on a table with the lid 14 upside-down such that the thermal mass 20 is facing upward, and the container 12 may be placed on the lid 14 so that the thermal mass 20 continues to warm the food within the container 12 from underneath. As an alternative to the above example, the thermal mass 20 may be cooled in a freezer and subsequently used to maintain a reduced temperature within the container assembly 10. As such, the container assembly 10 provides for the ability to warm or cool its contents for a period of time without use of electricity (after the thermal mass 20 is initially heated or cooled).
In the embodiment ofFIGS. 9A through 10B, the thermal mass 120 is not secured to the interior side of the lid 114 with a compartment defined on the interior side of the lid 114. Instead, the thermal mass 120 may be secured in a harness 30 as represented in
While the invention has been described in terms of specific or particular embodiments, it should be apparent that alternatives could be adopted by one skilled in the art. For example, the container assembly 10 and its components could differ in appearance and construction from the embodiment described herein and shown in the drawings, functions of certain components of the container assembly 10 could be performed by components of different construction but capable of a similar (though not necessarily equivalent) function, and appropriate materials could be substituted for those noted. Accordingly, it should be understood that the invention is not necessarily limited to any embodiment described herein or illustrated in the drawings. It should also be understood that the phraseology and terminology employed above are for the purpose of describing the disclosed embodiment, and do not necessarily serve as limitations to the scope of the invention. Therefore, the scope of the invention is to be limited only by the following claims.
This application claims the benefit of U.S. Provisional Application No. 62/963,823, filed Jan. 21, 2020, the contents of which are incorporated herein by reference.
Number | Date | Country | |
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62963823 | Jan 2020 | US |