US1695711A - Hot plate - Google Patents

Description

Dec 18, 1928. 1,695,711

T. JARBOE HOT ,PLATE Filed May 11, 1927 7Z0272a5 efarfioe. INVENTOR Q QTTORNEY Patented Dec. 18, I 1928.

THOMAS ,JARBOE, or salt rminorsco, CALIFORNIA Terr HOT PLAT n Application filed May 11,

This invention relates to improvements in hot plates and more particularly to supplementary hot plates for use in combination.

with gas stoves. It W 1 5 Amongthe ob ects of the invention areto conserve the heat generated by gas stove burners, whereby the maximum amountof heat may be applied to the cooking utensil with the minimum amount of gas consump tion. A further object of the invention isto improve combustion by providing a regenerative chamber for the expansion, oxidation and complete combustion of the gases ignited beneath the hot plate. A further object is tounitormly distribute the heat gen erated beneath the cooking utensil for' the purpose ofapplying a unitormtemperature throughout the exposed area of, the cooking utensil bottom, with the advantage that food as desired, without circumscribed areas or spots wherein the applied. temperature is higher or lower than at other; similar spots throughout'thecooking area of the utensil. Other objects and advantages will appear as this description progresses.

In th's specification and the annexed drawings, the invention is illustrated in the form considered to be the best, butI do not wishto cause it may be embodied in other forms, and

it is'also to be understood-that in and by the claimsfollowing the cl-escriptionit is desired to cover the invention in whatsoeverform it may beembodied;

In the accompanyingonesheetof draw ings, Fig. lis a plan'view. from above of a hot plate constructed in accordance with .thisinvention, the cover plate "being, partially broken away to show the structureandrelationof the regenerative platebeneath. Fig. 2 is a cross-section taken throughthe diameter of the same atIL-II. V 1 1 i In detail the construction illustrated in'the drawings comprisesa disc like plate 1, preferably circular in shape and composed of cast iron or other suitable stove material. This plate isprovided with the integrally cast concentric flanges 2, 3 and4. The first flange 2 is preferably located at the perimeter of the plate 1 the flange 4 is located at the center of the plate 1 and its diameter isapproximately equal to one-third the diameter of the plate, and the flange 3 is interspaced between the flanges 2 and 4. These dimensions are merely approximate and may, be varied to may be uniformly-cooked as fast or. as slowly be understood as confining it to this form, be-

1927. Serial 1%. 190,;24. E

flanges is provided with a series of inter spaced gaps These gaps are placed in in-' terspaced relation to each other in the several flanges mentioned, that is, thegaps are placed 1n radial almement with each other, thegaps suit circumstances; 7 Each of these concentric in-the intermediate flange 3 being between the lines of the gaps in the flanges 2 and 4.

.Theseflanges projectabove the plane of the plate 1 any suitable distance, one-quarter of an inch beingquite sufficient for the average size plate. I The plate 1 is also provided with the lugs '6, spaced about thecircumterence of 1 the plate 1, preferably between the gaps. 5 in the flange'Q. The plate isalso provided with a central lug ,havingacenter open ing therethrough and countersunk on the lower side to receive the conical head of the stove bolt 8.

The cover comprises. a circular disc of metal, preferably sheet aluminum .10; This cover hasa depending flange l-l'encireling the I regenerative plate 1 andengaging the lugs 6. Thisplate has the radiating embossed'ribs 12; radiating fromthe depressed center 13. and extendingapproximately to the flange 11. Six of such ribs are shown in the drawing, but three or more will serve the purpose hereinafter described. These ribs'12 divide the cover into segmental areas.

The opening's 14, through the cover, are located at the apices of these segmental divisions and are within' the area confined bythe flange 4 on the plate 1.. g H

The cover 10 is assembled on the plate lby means.. of the stove bolt 8 passing'fthere through and engaging the nut 9 screwed. thereon, pulling the depressed'center 13 of the cover snuglyagainst the top of the lugi 7. It; is unnecessary to the functioning of this invention that these two parts be thus 1 positively secured together, but it is convenv ient in handling the device,especially when it is hot., The regenerative plate 1 and-the cover 10'will beheld in their operative relation by the lugs 6 engaging the flange .11 to g center'the two parts, one upon the other.

:This invention operatessubstantially as follows: The device is placed overthe ordinary gas plate common to stoves using commercial gas or having flames generated from gasoline or kerosene, or other Bunsen type of i and curls upward into the regenerative chamber between the edge of the plate and the flames. The flame impinging against the loweriside of the plate 1 isspread thereby; i

flange 11 and is trapped between the lugs 6, before passing through the various gaps 5 in the flange 2. The flame passes into the concentric space between the flanges 2 and 3, and the plate 1 and the cover 10, across which it travels towards the gaps 5 in the flange 3, through which it escapes into the space intermediate the flanges 3 and 4 until it escapes through the gaps 5 in the flange 4, thence into the center space confined by the flange 4, from whence it escapes through the openings 14 into the various segmental areas of the cover 10 between the ribs 12. From thence it again travels laterally beneath the bottom of any utensil resting upon the ribs 12, until it escapes upward beyond the circumference of the utensil. Since the ribs 12 rise above the plane of the cover 10 some of the products of combustion travel along beneaththese ribs from the flange 2 to the center space within the flange The eflect of this device is substantially as follows: Cast iron is preferred for the regenerative plate 1. because of its well known ab sorption coefficient for heat, due very largely to its porosity. This plate gradually becomes very hot, so that the products of combustion passing between it and the cover 10 along the tortuous route described, are subjected to a certain expansive and regenerative effect which liberates the unconsumed carbon sus pended in the products ofcombustion from the flame and is subjected to the oxidizing effect of the free air drawn in between the edge of the plate 1 and the flange 11 by the natural aspirative efiect of the flame and products of combustion travelling therethrough. The flames of hydro-carbon burners also carry a large percentage of moisture which upon reheating and regeneration contributes to the improvement of combustion, adding to the liberated heat units. The circuitous route taken by the products of combustion in passing through the aps between the various concentric areas etween the flanges 2, 3 and 4, delays its passage and permits the necessary interval for the heat units tobe absorbed and equalized by the cover 10 and transmitted therefrom to the bottom of the cooking utensil resting upon the ribs 12. The residual parts of combustion, passing through the openings 14, flow laterally immediately in contact with the bottom of the utensil, before escaping therefrom, after having given up most of their heat units to the utensil.

Aluminum is preferred for the construction of the cover 10 because of its inherent 'ent is:

conserving heat units by confining them to the area for direct application to the food or other substances to be subjected thereto; with the additional regenerative effect of improved combustion which is desirable from the standpoint of economy.

It sometimes happens, where this device is used over flames that are not properly ad'- justed, that soot will accumulate within the regenerative chamber betweenthe plate 1 and the cover 10. This may be easily removed by submerging the whole device in hot water with suitable caustics and boiling the same or by removing the nut and bolt, 89, separating the parts and dusting out the accumulated soot in the dry state.

Having thus described this invention what I claim and desire to secure by Letters Pat- 1. A hot plate comprising a regenerative plate havinga flat under surface; peripheral lugs extending beyond the edge of said plate; concentric segmental flanges extending above the top of said plate; a cover having openings in its center portion and a depending flange engaging said lugs. 1

2. A hot plate comprising a regenerative plate having a flat imperforate under surface; a concentric segmental flange rising at the periphery and extending above the top of said plate; intermediate concentric flanges arranged on said plate within said peripheral flange; a cover resting upon saidflanges having openings in its center portion and a depending flan e extending beyond and spaced from the periphery of said plate.

3. A hotplate comprising a regenerative plate having a flat under surface; a concentricsegmentalflange rising at the and extending above the top of sai plate; a cover having openings near its center portion and resting upon said flange and having a flange extending beyond and below the periphery thereof; radial ribs on the top of said cover between the said openin s.

In testimony whereof I ave aflixed my signature.

THOMAS JARBOE.

hereunto periphery

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