Dutch oven type cooking vessel with combination cooking surface

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DUTCH OVEN TYPE COOKING VESSEL WITH COMBINATION COOKING SURFACE

TECHNICAL FIELD OF THE INVENTION

This invention relates to a novel dutch oven type cooking apparatus. More particularly, it relates to a dutch oven type cooking apparatus which has a bottom cooking pan portion and an upper top or lid portion, wherein the upper portion is convertible from a cooker pan lid to a stand alone grille.

BACKGROUND

In institutional and commercial kitchens, there is a continuing need to cook foods using different cooking methods. For example, at breakfast, the main meals may be cooked on a grille, but then at lunch or dinner, it may be desirable to deep fry, roast, or simply heat the foods in bulk. Normally, it is necessary to have a variety of different kitchen equipment available, each of which may be used to prepare foods by only one or two cooking techniques. Therefore, multiple equipment items, such as separate grilles, ovens, pans, and kettles are often found in such kitchens. The requirement for multiple equipment increases

-1213528^ \ * both the initial capital costs, and the floor space requirements for food preparation kitchens, thus increasing the ultimate cost of food preparation in the kitchen. Thus, particularly in those cooking operations where equipment costs or space constraints are most sensitive, it would be desirable to reduce the number of separate equipment items required. In short, it would be preferable to combine the function of several types of equipment into a single cooking apparatus rather than to limit the menu or reduce capital costs by eliminating certain cooking techniques from the kitchen altogether.

One attempt at a combination type device of which I am aware is illustrated in U.S. Patent No. 2,430,582, issued

Nov. 11, 1947 to Reich for HEATING DEVICE. That patent illustrates, in FIGS. 9-12 and FIGS. 15-17, a cooking device such as a grille which has an upper frame with a pivoting electrical heater to provide from one side direct radiant heat and from the other side conducted heat (through a metal plate) ; thus this device can be used as a grille or as a broiler.

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Another device is illustrated in U.S. Patent No. 4,957,039, issued September 18, 1990 to Reyes for a FIVE IN

ONE COOKER. Reyes illustrates a swivel top portion which can be inverted from a dome configuration where the dome is used as a lid to control the heating of barbecue on grilles below, or to a pan configuration so that food can be cooked in the pan. However, in so far as I am aware, no institutional type dutch oven cookers have been proposed which allow flexibility to switch between cook and grille configurations.

Therefore, a continuing demand exists for a simple, space saving, and relatively inexpensive cooking apparatus which can be used as desired in many different cooking modes. The need for such devices is commonly seen in institutional settings, such as hospitals, prisons, nursing homes, or in commercial restaurant settings, particularly where space is at a premium.

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I have now invented, and disclose herein, a novel, improved cooking vessel which does not have the above-discussed drawbacks common to those heretofore used cooking devices of which I am aware. Unlike cookers heretofore available, my cooking vessel is compact, relatively inexpensive, easy to install and to service, and otherwise superior to the heretofore proposed ones. Most importantly, it is easy to switch between various cooking modes.

The invention in one broad aspect provides an apparatus for heating foods, liquids, or slurries, the apparatus comprising a lower portion, a bottom pan portion, the bottom pan portion supported by the lower frame portion, and an upper frame, pivotally supported from the bottom pan portion. A top portion is pivotally affixed to the upper frame, and the top portion includes a lid portion and a grille portion. The upper frame further comprises a left end having a first pivot, and a right end, the right end having a second pivot, wherein the first and second pivots cooperate to allow the top portion to be rotated thereabout when the upper frame is raised, from a closed, fitting position, wherein the lid portion of the top portion is interf ittingly located at the bottom pan portion, to an extended, open position, wherein the upper frame is sufficiently upward so that the top portion is rotatable so as to interchange positions of the lid portion and the grille portion. The top portion is shaped such that the lid portion is nestable in the bottom pan portion when the upper frame is returned to the closed, fitting position.

Another aspect of the invention provides a cooking apparatus having a top portion and a bottom pan portion, the apparatus configured to supply heating fluid to the top portion or to the top and bottom portions thereof. The apparatus comprises a top portion, comprising at least one inlet and at least one outlet, and a bottom pan portion, comprising at least one inlet and at least one outlet. A first fluid passageway comprises a conduit between the inlet and the outlet in the top portion, and a second fluid passageway, comprises a conduit between the inlet and the outlet in the bottom pan portion. A regulator regulates the passage of heating fluid into the lid portion and into the bottom

-4CA 02185282 2002-06-21 pan portion, in a first, single fluid flow relationship wherein heating fluid is allowed to flow through the first fluid passageways, or in a second, multiple fluid flow relationship wherein heating fluid is allowed to flow through the fluid passageway in the top portion and in the bottom portion.

More particularly the apparatus of the invention provides for heating foods, liquids, or slurries and includes a lower frame portion, and a lower pan portion which is supported by the lower frame portion. An upper frame portion is pivotally supported from the lower pan portion. A top or upper compartment portion is provided, the top portion being pivotally affixed to the left and right sides of the upper frame portion.

The top portion includes a lid portion and a grille portion. In the preferred embodiment, the grille portion of the top portion is the inner wall surface of the lid portion, and is thus located in the upper reaches of the top portion when the lid portion is in a cooking position. When the top is rotated one hundred eighty (180) degrees, the grille portion provides an upwardly exposed grille surface for food preparation. Also, the top portion is shaped such that it may be lowered into and nested in the bottom portion when the upper frame portion has been returned to a resting or normal closed cooking position.

When hot oil or other fluid is used to heat the cooking apparatus, the bottom or lower pan portion further comprises a double wall portion. The double wall portion includes an inner and an outer wall which form a passageway therebetween. The passageway has an inlet and an outlet for the heating fluid to enter and leave the passageway. Heating fluid heats the inner wall which thus heats the food being cooked. The top portion also further includes a double exterior wall portion, where the double wall portion includes an inner and an outer wall with a passageway therebetween. The passageway has an inlet and an outlet, whereby a heating fluid may be passed into the passageway in the bottom pan portion, or into the passageway in the top portion, or simultaneously into the bottom pan portion and the top portion passageways, so as to heat the foods, liquids, or slurries contained by the cooking apparatus.

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Thus it can be seen that my dutch oven type cook system cooks from all sides with hot oil. Alternately, the unit may be heated electrically. The tilt type upper frame and the versatile convertible top portion allow my cooking apparatus to bake, roast, fry, braise, broil, saute, steam, or kettle cook. The apparatus may also grille in the short order style. A bottom draw off is provided to allow pumping of cooked food into cryovac casings or pouches for ice water chill of cryovac casings, or for blast chill of the pan contents.

The various embodiments provide further variations in the heating configuration and in provision of the heating means. Aside from the foregoing, my novel cooking apparatus is simple, durable, and relatively inexpensive to manufacture.

ADVANTAGES AND FEATURES

The apparatus of the present invention has numerous significant advantages over the apparatus currently used in institutional and commercial cooking operations. From the foregoing, it will be apparent to the reader that one important and primary object of the present invention is to provide a single, multipurpose cooking apparatus which allows foods to be cooked in any one of a variety of selected techniques, where the list of possible cooking techniques

-62185282 η which may be selected includes baking, roasting, frying, braising, broiling, grilling, steaming, or kettle cooking.

Other important but more specific objects and advantages of the invention reside in the provision of a cooking device as described in the preceding paragraph which:

may be quickly converted from either a pressure cooker to a grille, or vice-versa;

may be used as a steamer;

may be used as a stir fry pan;

may be used as a broiler;

is relatively compact and thereby conserves space;

is relatively simple;

is relatively inexpensive;

allows the foods to be discharged from the apparatus in a simple, one step manner;

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Other important objects, features, and additional advantages of my invention will become apparent to the reader from the foregoing and the appended claims and as the ensuing detailed description and discussion proceeds in conjunction with the accompanying drawing.

DRAWINGS

These and other features, aspects and advantages of the present invention will become better understood with reference to the following description, appended claims, and accompanying drawings, wherein:

Figure 1 is a perspective view of a cooking apparatus constructed in accord with the principles of the present invention, showing the top portion in a position for baking, roasting, broiling, or the like.

Figure 2 is a perspective view of the lower or pan portion of a second embodiment of the cooking apparatus constructed in accord with the principles of the present invention, showing the use of flat segments in the lower pan portion, and also illustrating the use of a remote control device for setting the cook conditions.

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Figure 3 is a side view of a cooking apparatus similar to that set forth in FIG. 1 above, constructed in accord with the present invention with the upper or top portion initially indicated in the cooker or broiler position, and also showing in hidden lines the upper compartment at an open position wherein the upper compartment is being inverted to the grille position.

Figure 4 is a vertical cross sectional view of my cooking apparatus, shown with the top compartment of the cooking apparatus positioned in the cooking or broiling position, and additionally showing the flow passageways for a heating fluid.

Figure 5 is a top plan view of the embodiment of the cooking apparatus shown in FIG. 1 above, now with the upper compartment opened outward horizontally in an extended position so as to fully reveal the cooking surfaces in both the bottom and the top portions.

Figure 6 is a third embodiment of my invention, showing the use of a gas heating system to heat the kettle.

Figure 7 is a fourth embodiment of my cooking device, showing the use of electrical heating elements to heat the upper and lower grilles.

In the drawing, like parts will be noted with like reference numerals throughout the various figures, without further comment thereon.

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DESCRIPTION

Referring now to the drawing and to the reference characters therein, FIG. 1 depicts, in its operative cooking position, a cooking apparatus 20 constructed in accord with, and embodying, the principles of the present invention.

Major components of the cooking apparatus 20 include: a lower frame or base portion 22, a bottom pan portion 24 which is supported from the base portion 22, and a combination grille and lid top portion 26. The top 26 is supported in a manner so that it can be opened in order to place the food to be cooked (not shown) into the pan portion 24, and so that the top 26 can be inverted about one hundred eighty degrees (180°) and thereafter used as a grille, as will be further described and illustrated herein below

In one embodiment, the top or lid portion 26 and the bottom or pan portion 24 are each double-walled vessels having inner and outer walls with a fluid receiving passageway therebetween, as can be readily seen in FIG. 4 below. Returning to FIG. 1, a heating fluid supply source 30 provides a heating fluid such as

-112185282 · hot oil or steam to heat the bottom pan 24 and the top lid 26. A control unit 32 controls the supply of heating fluid to pan 24 and lid 26 via way of regulation devices such as valves 34 and 36 respectively.

As it may be desirable to add steam or air directly to the interior formed between the bottom pan 24 and lid 26 of the cooking apparatus 20, a water supply 40 and an air supply 42 are provided to the cooling apparatus 20. Preferably, connection both the water supply 40 and air supply 42 is by way of a flexible hose (not shown) attached to a quick connect type fitting 44 (for water) and 46 (for air) as indicated at the rear 48 of pan 24. Vapors resulting from both the introduction of air or steam, or from the cooking of foods, are allowed to escape from the interior of the apparatus 20 and are vented through the top 2 6 via way of a steam vent outlet 50. This outlet 50 is also preferably provided via way of a quick connect fitting attached to a flexible hose 54. Normally, a vent outlet system also includes pressure regulating means such as an adjustable pressure relief valve 56, so that the cooking apparatus 20 may be used as a pressure

5 cooker. Valve 56 allows the cook to set the internal

-122185282 Ο pressure of the apparatus 20 somewhat above atmospheric pressure up to a rated pressure such as 8 psig (and normally not above 15 psig) . When used as a pressure cooker, the cooking apparatus 2 0 may have the top 26 secured to bottom pan 24 via way of snap levers or similar fasteners 58.

As illustrated in this FIG. 1, the top 26 is supported by, and rotates within and between the left 60 and right 62 ends of upper frame 64. A pivot joint 66 at the left end 60 and companion joint 66 on right end 62 of frame 64 provide the freedom of movement necessary for rotation of top 26. Movement of top 26 is possible once the top is raised to an open position as illustrated in FIG. 4 below.

The upper frame 64 is in turn supported from the rear 48 of pan 24 by hinges 67. A combination spring lift/shock damper 68 is positioned between a first pivot pin 70 at upper frame 64 and a second pivot pin 72 affixed to the rear 74 of base 22. The purpose of the shock damper 68 is primarily to prevent the top 26 from closing at an undesirably rapid rate from an open position. Damper 68 may also assist in slightly biasing the frame 64 toward an open position. For ease in “132185282 Ο moving the cooking apparatus 20 between locations in a kitchen, or to assist with access for cleaning, base 22 is provided with rollers 76, preferably with locking mechanism 78 to prevent the cooking apparatus 20 from moving when set at a desired location.

Attention is now directed at the rounded bottom 80 of pan 24 as shown in FIG. 1. This type of construction may be desirable in many applications, such as pressure cooker usage, but it generally increases the cost of apparatus 20. In contrast, in FIG. 2 is shown a second embodiment of my invention, cooking apparatus 90, which is similar to apparatus 20 shown in FIG. 1, but constructed with a lower pan 92 having a segmented flat bottom 94. The flat bottom 94 construction is somewhat cheaper to fabricate, and also may be more desirable for some types of cooking such as stir-fry or other oriental type cooking techniques.

<td> 20</td><td> Also in FIG.</td><td> 2,</td><td> the lid or top 96</td><td> is turned</td><td> upside</td>

<td></td><td> down as compared</td><td> to</td><td> top 26 of FIG. 1</td><td colspan="2"> . Therefore, in</td>

<td></td><td> FIG. 2, lid 96</td><td> is</td><td> shown with its</td><td> interior,</td><td> grill</td>

forming surface 98 upward. Quick conversion of the top

-142185282 portion 96 between a lid or cooking position, as illustrated in FIG. 1, and a grill position, as shown in FIG. 2, by way of simple rotation of the top portion

96, is a unique and important advantage of my cooking apparatus 20.

A remote control unit 100 is also shown in this

FIG. 2. The remote control unit 100 can be used to program or reprogram the control unit 32 on the cooking apparatus 90. Typical remote control units 100 use an infrared signal 102 which is broadcast from the remote control unit 100 and is received at the control unit 32, similar to television or video recorder type remote control units. The use of a remote control unit 100 may be especially important in some institutional settings, such as prisons, where it may be desirable to set or reset the cooking device independently and without the ability of local personnel to immediately readjust the control unit 32, so as to prevent the occurrence of sabotage to the cooking cycle.

Turning now to FIG. 3, a side view of a cooking apparatus 110 is shown. Apparatus 110 is similar to the apparatus 20 first shown in FIG. 1 above, although here a bottom drain line 112 is also shown. This line

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112 is preferably supplied in stainless steel of any desired size to accommodate the cooking apparatus size; for conventional sized units a nominal three inch (3) line 112 is satisfactory. Output from the drain line 112 is controlled by a knife type valve 114, and a line 116 to an outlet pump 118 is provided. The discharge from an outlet pump 118 may be sent to a cryovac pump and fill type bagging system (not shown) or other system for receiving the food slurry leaving the cooking apparatus 110. For example, chili may be cooked in cooking apparatus 110, and then drained through line 112 and pumped into cryovac bags to be cooled down in an ice bath for subsequent storage and/or freezing. This drain 112 feature is important since cooking apparatus 110 may be normally of a forty (40) to eighty (80) gallon size for commercial or institutional service, with a unit in the sixty (60) gallon size range expected to be commonly required.

In FIG. 3 the transformation of the top portion 116 from cooking service to grill service is illustrated in hidden lines. The top portion 116 is shown in cooking service or a lid position in solid lines. By moving upper frame 64 upward, in the direction of reference arrow 115, through the position indicated by reference

-lb2185282 numeral 64' and on upward to the position indicated byreference numeral 64'', clearance is achieved to rotate the top portion 116 to the grille position indicated by reference numeral 116'. An interior grill surface 118' is provided, which is upward when the top portion 116' is turned upward. When the top portion is moved downward in the direction of reference arrow 120 and nested in the pan 122, the top portion 116 provides a convenient grille surface 118. Note that the top portion 116 has a lower outer sidewall portion 124 which is sized for the close fitting insertion necessary to nest the lid 116 against the inner wall 126 (See FIG. 4 below) of the bottom pan 122.

Turning now to FIG. 4, a vertical cross section of cooling apparatus 110 is shown. In this FIG. 4, the double wall construction of both the bottom pan portion 122 and the top lid portion 116 are readily apparent. Heating fluid contained in hose 150 flows enters the

0 lid portion 116 through inlet 152. Inlet 152 has a fluid passageway 154 therein which communicates with passageway 156 in lid 116. Passageway 156 is defined between the inner 158 and outer 160 walls of lid 116. The heating fluid circulates in passageway 156 as indicated by reference arrow 162, so as to heat inner

-172185282 wall 158. The circulating heating fluid then proceeds through the lid 116 as indicated by reference arrow 164, then leaves lid 116 through passageway 165 in outlet 166, thence to hose 168. During the period of heating provided by contact of the heating fluid with inner wall 158, sufficient heat must be applied to heat the food on grille portion 118, or as necessary to provide a portion of the heat required to heat the food in the bottom pan 122 (when and as it is used) .

Similar to the process just described for the lid portion 116, heating fluid enters the lower pan 122 through hose 170 and inlet 172 having a passageway 174 therein. Heating fluid then proceeds downward in the direction of reference arrow 176 in the passageway 178 which is defined between inner bottom wall 180 and outer bottom wall 182. Heating fluid exits in the direction of reference arrow 184 and proceeds through passageway 186 in outlet 188, thence on through outlet hose 190. Just as described with reference to cooking apparatus 90 in FIG. 2 above, the flow of heating fluid to either the upper 116 or lower 12 2 portions of apparatus 110 may be regulated by control valves or the like (not shown) to control the cooking temperature to any desired level as regulated by control unit 32. Feedback to the control unit 32 may be provided by way of temperature sensing unit 191.

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Attention is now directed to FIG. 5, wherein a top plan view of the apparatus 110 which was first depicted in FIG. 3 above is set forth. Here, the upper portion

116 is fully extended outward, and has been rotated along with the upper frame 64 so that the grille surface 118 is upwardly exposed. Also, it can be further seen how the right side 60 and left side 62 of upper frame 64 support rotary joints 66. The joints 66 allow the upper lid portion 118 to rotate and to receive heating fluid by way of the inlet 152 and outlet 166 fittings which pass therethrough.

FIG. 6 illustrates a cooking apparatus 2 00, which illustrates a third embodiment of my invention.

Apparatus 200 is different from the first or second embodiments in that heating is provided by way of gas burners 202 under the bottom pan portion 122. Gas may be supplied via hose 206 from natural gas, propane, or other suitable supply source. In this embodiment, the upper portion 116 is heated with electricity.

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In the same manner as set forth in the earlier embodiments, the top portion of the cooking apparatus is rotatably secured between left and right sides of the upper frame portion, so that the top portion can be readily changed between the cooking and grilling configurations.

Still another embodiment of my invention is set forth in FIG. 7. This embodiment is similar to the designs set forth in the earlier figures, however, heating is provided to apparatus 220 via way of electric heating elements (not shown) which are supplied to lower pan 222 and upper pan 224 via shielded electrical power cables 226 and 228, respectively.

It is clear from the heretofore described figures that the present invention as described by cooking apparatus 20, 90, 110, 200, or 220 above provides a simple convertible clutch oven type apparatus which may be easily rotated between operating positions, and which may be releaseably secured at either position.

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It will be readily apparent to the reader that the present invention may be easily adapted to other embodiments incorporating the concepts taught herein and that the present figures are shown by way of example only and not in any way a limitation. The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description; and all changes which come within the meaning and range of equivalences of the claims are therefore intended to be embraced therein.