US 3,940,589 AGrant
Portable Cooking Equipment
Issue Date:1976-02-24
•2 Claims
•1 Drawing Sheets
Abstract
A portable cooking installation consists of a heat-insulated enclosure containing a plurality of separately controllable electrical-resistance heating element surrounding and at least partially defining a space to receive a cooking vessel. For instance, two, three or four strip elements formed into circles of progressively increasing diameter (reckoning upwards) lie horizontally around a common axis to define a space to receive a suitably tapering cooking vessel; the elements can have aligned planar inner surfaces and be mounted on a resilient common support to improve vessel/element contact.
Metadata
Assignee
- Tup! (Panama) S.A.
Inventor
- Earl Silas Tupper
Application Information
Application Number:US 4175832
Filing Date:1973-11-20
Priority Date:1971-12-08
Art Unit:213
Classifications
IPC:
F27D 1102
Field of Search:
219425378;408;417;422;424;426;430;431;432;433;434;435;436;437;438;439;440;441;442 ;456;521;522;528;535;536;537379 R
Patent Drawings (1 sheets)
Description
The invention will be further described with reference to the accompanying drawing, FIG. 1 of which shows a sectioned perspective view of a portable article of cooking equipment according to the invention, and
FIG. 2 of which shows a scrap section of the heating element.
The equipment according to the invention consists of a generally cylindrical enclosure 1 having an outwardly and downwardly turned upper rim 2. Within this enclosure there is a layer of heat-insulating material 3 extending all around the curved wall and a bottom layer of heat-insulating material 4. Standing within the cylindrical enclosure is a resilient support member 5, generally cylindrical in shape, but formed with an outer wall 5a standing within enclosure 1, a resilient inner wall 5b and a base 5c. The inner wall 5b surrounds a generally conical space and supports heating element structures, generally referenced as 6, 7 and 8. Heating element structure 6 consists of a cylindrical electrical resistance heating element 6a with circular layers of insulating material 6b and 6c, the inner layer 6b having a planar innermost contact face 6d, and the outer layer 6c being held on the support wall 5b by stamped lugs 5d (see FIG. 2). Of course, elements 7 and 8 have similar structures to element 6. These heating elements jointly define a space suitable for receiving (in contact with the insulating layer 6b or, if the vessel is of electrically insulating material, possibly directly in contact with the elements, omitting such insulating layer) a cooking vessel 10 which is bent over at its rim to cover and fit against the downturned rim 2 of the enclosure 1 and to define an annular trough 11.
The various heating elements 6, 7 and 8 are separately connected by leads generally indicated at 12 to a control box 13 by means of which one or more heating elements may be selected depending upon the nature and amount of the material to be cooked in the cooking vessel.
The equipment is completed by a lid 14 which rests in the annular trough 11 and has a conventional handle 15. Lid 14 has a downwardly sloping inner surface 14a.
The dotted lines show that the elements 6, 7 and 8 completely surround the vessel.
In use the cooking vessel not only stands within the various elements 6, 7 and 8 but rests against them to assure effective heat transfer, since the planar contact face 6d and like planar faces in element structures 7 and 8 define the enclosed space accurately while the resilient support 5 accommodates any small deformations to the extent necessary.
It is also envisaged that the heating elements can be attached to the support member 5b by additional ceramic or other refractory lugs or clips, provided that such attaching devices not affect the desired contact between the cooking vessel and the elements 6, 7 and 8. This requirement will present no difficulty to the man skilled in the art, whether the support member 5 be made of metal or of electrically non-conductive material.
Alternatively, and especially where the support member is made of metal, the elements can be covered with insulating material such as asbestos, and attached directly to the support member.
Of course, the equipment shown in the drawings is capable of wide variation within the scope of the invention, provided that at least one surrounding heating element within the insulated enclosure defines a space to receive the cooking vessel 10. Thus, the cooking vessel can be a pressure cooker, the surrounding annular rim can be detachable from the pot or be dispensed with altogether if there is no danger of spillage, and/or lifting handles can be provided (e.g., recessed into the walls of the cooking pot) instead of the lifting arrangement with the annular rim. Also, the surrounding enclosure can be of any desired cross-section and appearance, and may be provided with decorative or instructional panels on its outer surface. If desired, and to improve heat insulation, spacing feet may be provided on the base of the enclosure to support it clear of, for example, a dining-room table.
Claims
I claim:
1. A portable article of cooking equipment consisting of: an enclosure member, open at the top and comprising a surrounding wall formed of heat-insulating material and a base formed of heat-insulating material: a resilient support member within said enclosure member and having an internal wall portion defining an inner chamber open at the top and of decreasing cross-section from top to bottom, and a resilient support for said internal wall portion, said internal wall portion being spaced from said surrounding wall and from said base of said enclosure member; a plurality of strip electrical-resistance heating elements formed into a series of like loop-shaped members supported on the inner surface of said internal wall portion in a horizontal disposition and vertically spaced one from the other, thereby defining a space for receiving a cooking vessel resting by gravity against each element; resilient support means on said internal wall portion, said elements being mounted on said resilient support means to accommodate small deformations of fit between the elements and a cooking vessel held therein; electrical insulation means spacing said elements at least from said internal wall portion; separate electrically insulating electrical connections, one for each heating element; and electrical switching means mounted to the outer wall of said enclosure member and connected to said electrical connections, whereby said heating elements can be selectively controlled.
2. A portable article of cooking equipment as claimed in claim 1 wherein said heating elements are each provided with a planar innermost surface, all said surfaces defining the space for receiving the cooking vessel.
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