US1052119A - Universal electric induction heating and cooking element. - Google Patents

Description

UNIVERSAL J. L. ANDERSON.

1112011110 lNDUCl'ION HEATING AND COOKING ELEMENT.

APELIUATION TILED 111111.12, 1912.

Patented Feb. 4, 1913.

2 SHEETS-SHEET 1.

Witnesses O0 OOOKDOOOO 0000 O OOOOOOCOCOO Attorneys Patented Feb. 4, 1913.

2 SEEETS-SHEET 2.

Attorneys m inventor J. L. ANDERSON.

APPLIGATION FILED MAR.12, 1912.

UNIVERSAL ELECTRIC INDUCTION HEATING AND COOKING ELEMENT.

2 W7; /9 @1 0; @U/ W w 1 maximum degree and retained at the de-" JOHN L. ANDERSON. OF OGDEN, UTAH.

UNIVERSAL ELECTRIC INDUCTION HEATING AND COOKING ELEMENT.

Specification of Letters Patent.

Patented Feb. 4,] 91 3.

Original application filed October 30, 1911, Serial No. 657,574. Divided and this application filed March 12, 1912. Serial No. 683,236.

also constitutes the secondary circuit of the same, the present invention being a divisional application of the application filed October 80, 1911, Serial No. 657,574.

A further object of the present invention isthe use of a transformer so constructed and arranged as to be used as a cooking utensil, such as a hot plate or griddle, or as a sad iron, both of such elements being provided with means whereby the temperature may be regulated from a minimum to a sired degree, thus rendering a cooking utensil or sad iron that is exceedingly useful and practical.

proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of invention herein disclosed can be made Within the scope of what is claimed without departing from the spirit of the invention.

In the drawingsFigure l is a top plan View of the element used as a hot plate or griddle. Fig. 2 is a section taken. on line 22 of Fig. 1.' Fig. 3 is a longitudinal sectional view through a sad iron embodying the present invention. Fig. 1 is a section taken on line H of Fig. 3.

Referring to the drawings, and more particularly to the structure shown in Figs. 1 and 2, the numeral 1 designates the core which is composed of soft iron wire and is held in place by the circular retaining casing 2, an annular recess 3 being formed in the core, and into which is placed the primary or .inducing winding or coil A fire proof insulating plate 5 is provided, and

fitting over the coil 4, is an iron cover, griddle or heating plate 6. ielow this cover, is an annular non-magnetic plate or ring 7, which is welded or brazed to the iron cover 6, the said plate or ring T being made of copper or brass, and fitting into the annular recess 8 of the core 1. threaded as at 8 and has the top portion of the collar 9 of the cover fitted thereon. Thus by rotating the cover or plate 6, with respect to the casing 2, said plate or cover is elevated with respect to the core 1, thus varying the air gap therebetween. An insulating bushing 10 is provided for the purpose of the passage of the flexible conductor 11 which is properly insulated and is conneeted to any source of electrical energy.

The operation of the cooking utensil as shown in Figs. 1 and 2 is as follows :The alternating current which impressed upon the primary coil 4 produces a flow .of current in such coil, so that'said current in turn sets up an alternating magnetic field in the core 1. This magnetic field flows through the cover or plate 6, forming a link with the circumferential edge thereof and the ring 7 thus inducing current of large value but low voltage in both the plate 6 and the ring 7. The heat generated by these secondary currents in the ring 7 is readily transmitted to the plate 6, as said plate 6 and ring 7 are Welded or brazed together as heretofore described. The direction of magnetic flow in the 'plate 6, is radially, and the direction of flow of the induced or secondary current is parallel with the direction of current in the primary coil 4:, or circumferentially around the plate 6. Thus by rotating the plate 6 relatively to the casing 2, and thus varying the distance between the core 1 and the plate 6, the magnetic flux entering the plate 6, can be varied and consequently the induced or secondary currents. The heat generated in the plate 6 can therefore be varied at will, the range of heat varying or rather shading from the minimum to the maximum, similar to that of a gas burner.

The induction sad iron, as clearly shown in Figs. 3 and 4, is a modification of the induction hot plate or griddle, it requiring simply a few changes in the mechanical features to employ the same principle as heretofore set forth. In this instance, the heat is generated in the base or sole 12 of the iron,

this sole being in reality the plate 6 as The casing 2 is shown in Figs. 1 and 2. The core 13 is made or formed of a series of laminated sheet iron strips 14, while the shoe, sole or base 12 is composed of cast steel, and constitutes part of the magnetic circuit, and also the secondary circuit of the transformer, this sole or base being the heat transmitting element. In this sole or base is placed the primary or inducing windin or coil 15, and brazed or welded to the inslde of the sole 12, is a nonmagnetic plate 16, which is composed of cop er or brass. This plate fits in the recess of the core that is'also occupied by the coil 15, the coil being retained in proper position and above the non-magnetic plate lo-by the coil retainers 17. The screws l8 pass through thecore 13'and engage the-,nut's 19 fitted 1n recesses]; at the bottom of the core 13 and thus provide a means for varying the magnetic ,air gap as at, a, and consequently the heat generated by the sad iron. A stitt leaf spring 20 is provided to prevent vibration of the core, while the pressed steel housin 21incloses both the core and the coil.

Vhen it is desired to increase the air gap (1, the milled heads 22 are turned and thus the screws 18, .due ,tothe fixed position of the nuts 19, cause the nuts to move upwardly and consequently raise the core 13 and coill5.

From the foregoin description taken in connection with the rawings, it is evident that with a heating unit as herein set forth,

that the heat induced thereby may be regulated to a nicety and retained at'any desired degree, thus rendering a device-for cooking purposes as shown in Figs. 1 and 2 or a de- "yice in the form of a sad iron as shown in Figs. 3 and 4, exceedingly-desirable 'and practical, the adjustments for producing the effect being readily accessible to'the oper star and whereby such adjustment may be given to theelements at will and as desired.

What is claimed is 1. An electric induction heating element,

having an envelop, a transformer disposed therein having an air gap, and forming the heating unit, and means for varying the alr gap of the transformer to regulate the de' gree of temperature generated in the element.

2. An electric induction heating element, having a casing, a transformer forming the heating unit therefor mounted in said casing and having a core,fa coil and a heating plate, and means forj'varyin the relation of said plate to the core and coi to regulate the degree of heat generated.

3,, An electric induction heating element,

havingia; casing, a transformer forming the heating unit. therefor disposed within the a casing and having a core, coil and a heating plate, a magnetic plate forming the heat transmitter, and means for varyin the relation. of. said plate:to the core an coil and consequently the d e ree of heat generated.

4:. An electric in uction heating element,

having a casing, a transformer forming the heating unit disposed within the casing and having a core, coil. and a heating'plate, a

magnetic plateforming the heat transmitter, anon-magnetic element carried by said magnetic late and opposed tothe core, and

means for varying the air gap between the non-magnetic element and the core.

' 5. An electric induction heating element,

having" a casing, a coil and core disposed therein and providin a recess'adjacent to the core, a heatingp ate of magnetic metal connected to the casing, a non-magnetic-ring carried by the heating plate: and fitting in said recess, and means for varying the air gap between the non-magnetic ring and the core.

6. An electric induction heating element, having a casing a coil and core disposed therein and provldinga recess adjacent to the core, a heating plate of a magneticmetal closing the casing, a non-magnetic ring carried by the heating plate and fitting in said recess, and means for adjustably connecting the heating plate to the casing and for varying the air gap between the non-magnetic ring and the core.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence pf two witnesses. JOHN L. AND'E'RsoN.

Witnesses:

G. V. ZINN, D. \V. Ennis.

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