This invention relates to cooking pot assemblies and accessories for cooking stoves, and more particularly to cooking stoves for use in the field.
The use of cooking stoves is as at least as old as civilization itself. To cook or heat any food product it is generally desirable to contain it in a pot, pan, kettle or other enclosure that is capable of absorbing and spreading heat over the surface of the food product. In the case of any flowing and/or liquid-based food product, such as soup, stew, hot drinks, and the like, the ability to heat in a pot or other like cooking device is essential.
A challenge has existed for campers, and/or those travelling by foot or other conditions that necessitate lightweight carriage of supplies. A great deal of development has occurred in providing multi-use, portable, and generally lightweight cooking products. One highly effective product is the BioLite Camp Stove, produced by BioLite LLC of New York. This portable camp stove harnesses the power of generated heat from consumed biomass (e.g. wood, twigs, woodchips, etc.) to operate a thermoelectric generator (TEG) that effectively powers a fan for improved, more efficient combustion. The TEG can also provide auxiliary power to charge various electronic devices, such as cellular phones, GPS devices, and the like. A common standard, such as USB can be used to distribute such charging current.
The camp version of BioLite stove includes a top-fed combustion chamber that resides within a double-walled assembly through which air enters via injection ports from the TEG assembly. It also includes a probe that extends from the TEG assembly into the interior of the combustion chamber to provide a novel arrangement for capturing the hottest region of a flame and transferring that heat to the “hot side” of the TEG. A heat sink on the opposing “cold side” of the TEG allows airflow driven by the assembly's fan to cool the TEG before it enters the double-walled region of the combustion chamber for mixture with the fuel contained therein. The top fed opening of the BioLite Stove includes a standoff assembly that supports a pot, pan or kettle having a base with a predetermined size (perimeter or diameter). This standoff assembly includes lower and higher parts that allow combustion gasses to pass around the pot/pan/kettle. By way of example, the BioLite stove carries its TEG assembly along the side, and it is typically removable for transport and storage. While various versions allow for storage of the TEG assembly directly within the top-fed combustion chamber, this can limit the size of the assembly based on the size of the chamber. It is desirable to provide a space that allows for safe storage and transport of the TEG assembly. It is more generally desirable to provide a portable, low-profile and versatile pot or kettle that can fit the cooking surface and associated standoff assembly of the BioLite stove and other gas and/or biomass stoves. This pot assembly should allow for storage of additional accessories and enable versatile use as a cooking pot or kettle with a pour spout, among other uses. In addition, the pot assembly should allow the flame and exhaust gases (collectively termed “combustion gasses”) to exit freely from the stove, while maintaining a relatively clean interface between the pot assembly bottom and stove top. Likewise, it is desirable that the pot assembly avoids directing heat to areas that should remain cool.
This invention overcomes disadvantages of the prior art by providing an efficiency pot and kettle for use with portable stoves that incorporates a number of features that enhance portability and allow for multi-purpose applications, such as a cooking pot, kettle with pour spout and storage compartment. The system includes a lid, pot body assembly and an adapter assembly. When the lid is fitted onto the pot body via a snap fit, it closes off the pot assembly to maximize heating.
In an illustrative embodiment, the lid is fashioned to have a removable cap that provides safe access to the interior of the pot while cooking so that the ingredients can be stirred and/or added. The lid has a pour spout that is formed to direct a stream of liquid away from the pot and provide controlled dispersal of the heated contents. The lid has a plurality of slits along the top so as to enable straining of cooked contents and contribute to an even flow when pouring liquids. The lid can be formed of a natural or synthetic polymer and be transparent, opaque or clear. The pot body is a cylindrical pot with a top opening and a bottom, with handles mounted on one side. The pot can be formed of stamped aluminum, stamped stainless steel or another durable material. In alternate embodiments, the pot can be manufactured by another process (for example, casting). The pot exterior can be anodized, painted, ceramic coated or uncoated. The exemplary pot has a height in the range of approximately 150 mm to 250 mm from the bottom to the top and a diameter in the range of approximately to 100 mm to 165 mm. The volume is therefore in the range of approximately 1 to 4 liters. The overall weight is approximately 300 grams. The pot body handles can be folded to the pot body wall, or opened to make a contact and create a triangular configuration that provides a steady and sure hold on the handles.
The adapter assembly can be removable from or fixed to the pot body. The adapter assembly is comprised of an upper flame flange; a lower flame flange, a centering ring and an intermediate baffle assembly. The upper flame flange directs and controls the combustion gasses and prevents the combustion gasses from passing along the exterior of the pot body and prevents soot deposits on the exterior of the pot body. In another embodiment, the centering ring is integrated with the upper flame flange. The lower heat flange directs the flame and heated combustion gases outward away from the power module (not shown) so as to keep that module relatively cool and prevents any downward flame movement. Notably, the position of the baffles prevents the flame exhaust from overheating the handles. The baffle assembly is an arrangement of a plurality of baffles arranged in a ring and spaced apart so that the flame can be carried out of the pot. The centering ring is sized and arranged to receive the top of the stove and to prevent lateral loss of the heated stove exhaust and helps to stabilize the pot assembly during use. Heat exhaust from combustion within the stove rises into the baffle assembly where it heats the bottom of the pot body and, indirectly, the contents of the pot, and is directed through the baffles. This movement creates a draft for the flame and ensures a controlled and steady heating for cooking To cook with the pot assembly, the user first takes off the lid and removes the contained stove. The stove is fueled and ignited. The pot body and adapter assemblies are placed onto the top of the stove using the center ring to provide a secure engagement. The contents to be heated are placed into the pot and the lid is attached by a snap fit. As the stove cooks the pot contents, the user from time to time can remove the cap, add ingredients or stir the ingredients. When the contents are cooked, the handles are used to raise the pot body and dispersal the contents through the spout. If the contents require straining, the straining lids can be used, after which the lid is removed to access and dispersal the contents. An optional serving bowl is provided that illustratively nestles within the pot body when not in use. In another embodiment, the size of the pot body can vary and be sized to include accessories and fuel. The handle can be unitary and folding. The handle can be folded to create a triangular structure that provides greater control and stability than that found in the prior art. The pot can be provided with a pair of L-shaped handles that confront each other and create a grip to control the dispensing flow of liquids from the pot. The adapter assembly can be fixed to the bottom of the pot body or removably attached thereto. The pot body exterior can be furnished with ring mounts to accommodate carrying straps or mounting points. In an alternate embodiment, the adapter ring is provided with a wall that extends below the bottom of the pot, forcing combustion gases to generate a back pressure that forces the gases through the vents with sufficient force that soot does not accumulate on the outside surface of the pot. In another embodiment, the lid assembly is constructed and arranged with a lid that is provided with a central handle on the top with cutouts on either side of the handle and situated above a concave removable cap.
The invention description below refers to the accompanying drawings, of which:
The above-described BioLite stove is shown by way of example in conjunction with the illustrative embodiment of the present invention. This stove is exemplary of a variety of possible stoves and/or cooking surfaces that the illustrative embodiment can be used together with, and should be taken as a non-limiting example. By way of useful background information, the BioLite stove is shown and described in various versions in commonly assigned U.S. Pat. No. 8,297,271, entitled PORTABLE COMBUSTION DEVICE UTILIZING THERMOELECTRICAL GENERATION, by Jonathan M. Cedar and Alexander H. Drummond, the teachings of which are expressly incorporated herein by reference.
As shown in
The lid assembly 110 serves to protect the stove and its power module 172 (also known as the “TEG assembly”) when the stove 170 is being stored inside the cook pot for protection and compact storage. This storage capability ensures that the contained stove is kept free from the influence of the environment, and safe from accidental damage due to dropping, etc. The lid 110 is provided with a lid body 112 and a removable cap 114 as shown in
Note that the items, such as the TEG assembly, covered by the lid 112 can be supported by the top of the contained stove within the pot, or the overall assembly can include a secondary pot lid that is relatively flat and shaped in the manner of a conventional pot lid. This lid includes a rim that extends to the edge of the pot perimeter so that it is free of interference with the lid 112. Thus it “nests” within the lid 112. This lid can be constructed from metal or a heat-resistant polymer and can include a (for example) folding center handle for lifting. This lid allows the pot to be fully covered for certain cooking activities.
The body 112 has a molded detent 124 that can facilitate a user's grip on the lid 110. The detent 124 is provided with a plurality of narrow slits 126 that facilitate the use of the lid 110 as a strainer. The narrow slits provide ports through which air can enter during pouring, to improve the flow of contents through the spout. The slits enable the pot assembly 100 to be used to cook rice, pasta, vegetables and other food products that are prepared in a suspension of boiling water. The lid 100 can be constructed of a natural and/or synthetic polymer, for example, rubber or various hardened plastic products, for example polystyrene, acrylic, polycarbonate, or the like. The lid can be translucent, opaque, clear or tinted. In another embodiment, the lid is fashioned from a metallic material, for example, aluminum and/or steel, typically with a pliable gasket between the lid and pot. The lid 110 is open on the bottom so that it fully engages the top of the pot body 130.
The pot body 130 has a height H1 in an exemplary embodiment is in the range of approximately 150 mm to 250 mm from the bottom 136 to the top 132. The wall thickness is in an exemplary embodiment is in the range of approximately 1 mm. The diametric width W1 of the pot body 130 is uniform and in an exemplary embodiment is in the range of approximately 100 mm to 165 mm. The volume is therefore in the range of approximately 1 to 4 liters. In an embodiment, the pot body is approximately 240 mm in height and has a diameter of 130 mm, with a volumetric capacity of approximately 2 liters and an overall weight of approximately 300 grams. The pot body 130 material is stamped aluminum and is covered on its exterior with anodizing or another durable finish. In alternate embodiments, the material can be composed of stainless steel or another durable metal. The dimensions of the pot may vary larger or smaller, depending on the overall dimensions of the stove.
The adapter assembly 150 is a fixed or removable structure at the bottom of the pot body 130. The assembly is comprised of a upper flame flange 152, a circular baffle assembly 154 of evenly sized baffles 156, a lower flame flange 158 and an open ended centering ring 160. The centering ring 160 is sized and arranged to receive the top of the stove and to prevent lateral loss of the heated stove exhaust. The centering ring fully surrounds the cooking surface and stabilizes the pot assembly during use. The upper flame flange 152 directs the combustion gasses from the stove's combustion chamber outward and away from the lower edge of the cooking pot thus preventing most of the soot from the combustion gasses from blackening the vertical sides of the pot. The lower flame flange 158 directs the combustion gasses and heated combustion gases outward away from the power module (not shown) so as to keep that module relatively cool. The baffle assembly 154 is constructed and arranged so that the flame exhaust is prevented from overheating the handles. This outward direction prevents any downward movement of combustion gasses that could adversely affect the function and/or electronics of certain components, such as the cold side of a TEG assembly in the case of the BioLite stove. The baffles 156 are arranged in a ring and spaced apart so that the combustion gasses can be carried out of the pot. This function will be described more fully below.
The wall 162 is constructed to close a portion of the baffle assembly 154 and connects the upper flame flange 152 with the lower flame flange 158 along the outside of the adapter assembly 150. The wall 162 deflects heat away from the handles 140 and keeps that surrounding area relatively cool by preventing the combustion gasses from the stove from flowing underneath the handle. The centering ring 160 is attached to the lower flange and serves to position and stabilize the entire pot assembly 100 over the stove and prevent the combustion gasses from escaping out the sides of the stove's standoff assembly to direct more heat to the bottom of the pot body 130.
More particularly, and in accordance with an embodiment directed at a geometry of a cooking top like that of the BioLite, the centering ring 160 acts as a downwardly directed skirt that ensures the pot assembly's lateral motion with respect to the cooking top is restricted and that any exhaust gasses and/or flames that past through the standoff assembly are generally blocked from easily existing the sides, this the gasses pass upwardly and exit the adapter assembly via the baffles. The centering ring can have an inner diameter that is a fraction (e.g. 1/16-½) of an inch greater than the outer diameter of the stove's standoff assembly so that the pot easily drops onto and lifts off the cooking top. The vertical distance of the skirt can be between approximately ¼ and 1 inch in various embodiments.
Referring now to
In another illustrative embodiment, a pot assembly 1000 is comprised of a lid assembly 1010, a pot body assembly 1030 and an adapter assembly 1050, as shown in
A ring 1015 is an adapter ring that holds the lid assembly 1010 in place during cooking and storage. In an embodiment, the ring 1015 is formed of silicone that is an insulator between the heat of the pot walls 1034 and the lid assembly 1010. The pot body assembly 1030 is a 1.5 liter pot and is formed of stainless steel. In other embodiments, the volume can be greater or lesser and other materials, for example, aluminum, can be used for the material of the pot body assembly 1030. The handles 1040 function as set forth above and can be coated with silicone or another material that insulates the handles from heat and provides a sure grip by the user.
An adapter assembly 1050 is an interface between the pot body assembly 1030 and the top of the stove (not shown). The baffles 1050 have the same function as set forth above and divert the combustion gases away from the vicinity of the handles. In the illustrative embodiment the baffles are shaped as pairs of nested tear-shaped holes. In other embodiments, the baffles can be circular and have a single outlet on each side or a multiplicity of more than two outlets.
The pot assembly 1000 is shown in an exploded view in
As used herein, “up” and “upward” are each defined as a direction taken from the adapter assembly and toward the lid with the “top” being at the approximate maximum point. “Down” and “downward” are each defined as a direction taken from the lid and toward the adapter assembly with “bottom” being at the approximate maximum point. “Interior” is defined as a region or surface facing or in the open space of the pot body 130, while “exterior” is defined as a region or surface facing away from the space of the pot body and/or residing on an outside surface of the pot body, lid and/or adapter assembly and exposed to the outside environment. More generally, as used herein the directional terms, such as, but not limited to, “up” and “down”, “top” and “bottom”, “inside” and “outer”, “front” and “back”, “inner ” and “outer”, “interior” and “exterior”, “downward” and “upward”, “horizontal” and “vertical” should be taken as relative conventions only, rather than absolute indications of orientation or direction with respect to a direction of the force of gravity.
The foregoing has been a detailed description of illustrative embodiments of the invention. Various modifications and additions can be made without departing from the spirit and scope of this invention. Features of each of the various embodiments described above may be combined with features of other described embodiments as appropriate in order to provide a multiplicity of feature combinations in associated new embodiments. Furthermore, while the foregoing describes a number of separate embodiments of the apparatus and method of the present invention, what has been described herein is merely illustrative of the application of the principles of the present invention. For example, the handle can be a folding unitary member. The adapter assembly can be fixed to the bottom of the pot body or removably attached thereto. A taller pot can be provided for storage of the stove and additional accessories and/or fuel. The pot body exterior can be furnished with ring mounts to accommodate carrying straps or mounting points. In another embodiment, the lid can additionally function as a bowl. The bowl lid can be provided with steam vents instead of a spout (or other access ports) and with or without a removable access port. The lid can then be constructed and arranged as a closed serving bowl. The lid can also be metal and constructed and arranged in a shape of at least one of a fry pan and a small scale cooking pot. Accordingly, this description is meant to be taken only by way of example, and not to otherwise limit the scope of this invention.
This application claims the benefit of U.S. Provisional Application Ser. No. 61/726,221, entitled EFFICIENCY POT AND KETTLE FOR USE WITH COOKING STOVES, by Alexander H. Drummond, Jonathan M. Cedar, Nisan H. Lerea and Clay Burns, filed Nov. 14, 2012, the teachings of which are expressly incorporated herein by reference.
Number | Date | Country | |
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61726221 | Nov 2012 | US |