US1157100A - Electric heating device. - Google Patents

Description

W. S. HADAWAY, JR.

ELECTRIC HEATING DEVICE.

APPLICATION FILED SEPT. 5. 1911.

1,157,100. Patented Oct. 19, 1915.

2 SHEETS-SHEET I.

w. SQHADAWAY, JR.

ELECTRIC HEATING DEVICE.

APPLICATION FILED SEPT. 5. 1911,

Patented Oct. I9, 1915.

2 SHEETS SHEEI 2 WZZZZWZS Eadawf: 3a

WILLIAM S. HADAWAY, .13., OF NEW YORK, N. Y.

ELECTRIC HEATING DEVICE.

in? MM.

Appiication flied September 51811.

a known that l, \YiLLrAM S. HAMWAY, tizen of the United States, residing lzoriif. in the county of New York and mate of New Yorli have in. ented new and fni improvements in l....i-ctrie Heating ilk-vices, of which the 'ioilow ing is a full,

7 concise, and exact dose! hei had to tile a ing. forming a part of ns speeirn My invention relates to electric devices it has among it: oi provide an eirctri: hcah in an. of heat by radiation is it down. to the minimum, and if h the heat iil ecteiil to the surface to 3 may n" rtgalatcd to any desired heating My im'entmn further has aiming its ob- 5 to provide an nuproved heater, where parts are cmzepactl v assembled and "ling cienirnt may be made up into ages at my im-- ereina tier appear.

i have for 1 my invenarmer. oi' oi choco- I shall i to this use. imitcd in the spciific l.

a in: I

the type used in tin.

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: l iguic l si-mbled sho 's a inverted I, exposed. sertional view shown in Fig. .tioiisl view on "mm a detail clung; the conzit. Figs. 5. T. 8, :ir'mms the heater. In tin: 11 mm in these figures, the chocoiatc heater wind of three pans. A. ii and formed of h l'ilv tinned plate L znilar con for This. is saint 11 Ar is prof- 12 in a suitable.

line i i Vim" (it (lw tor; and

which oi .i enin tm'ai,

i. within.

5 with! i Kr sti Specification of L tters Patent.

Serial No. 647,692.

heating element and Will be more full hereinafter described, is carried within t e pan A, as shown in Figs. 1 and 3, so that an air space is formed between the outer surface of the pan B and the inner surface of the pan A. These surfaces are preferably iighly polished.

In the form illustrated, the upper edges of the pans A and B are provided with Elan 2 and 3, which are soldered together, so that these pans may be inserted in an opening in a table, as a single device. The pan (J which holds the material to be heated is carried Within the pan B, as shown in *ig. 3, and is provided With suitable flanges 4 and 5, on its sides, which are adapted to receive marble slabs upon which the operators work. As illustrated in F ig. 3, the pan (.7 rests upon the flanges 3 of the pan B, and

l and 5 of the pan C, so as to hold the parts of the device in position. The pan C is provided with suitable handles 7 at its ends, so that when the slabs 6 are pushed back, it may be readily removed for cleaning or other purposes.

The pin B, containing the heating element, is shown in Fig. 2, with the'heating clement exposed. As shown in this figure and in Fig 3, this pan is provided with an inner rounded bottom plate 8, preferably iflililP-l integral with the flange 3. Over this rounded bottom is placed a sheet 9 of insulating material. If desired asbestos may he used. Over this sheet of insulation is placed a sheet of insulating material 10, carrying upon its surface the resistance matcrial Ill. In a preferred form I use a sheet of mica as the insulating materia Over this resistance material is placed a sheet of insulation 12, which may be formed of asbestos and over this sheet 12, is placed a sheet 13 of a highly polished metal, such as tinned plate. The edges of the various sheets may be secured to the bottom 8, in any suitable way. For instance, as shown in big. 2, I may hold these edges in pa sition by means of strips 15, which are slightly spaced from the plate 8 so that the edges of the sheets may be slipped between the sillllk tlll l said plate. These strips extend along beneath the flanges 3, and are bent at their ends to extend around the square ends of the pan.

Upon the ends 16, of the pan, are carried strips 1?. suitably fixed to the ends and ratented Oct. 19, 1915.

adapted to receive the bent ends of the strips 15. The ends i8 of the strip 17, are adapted to he bent over upon the strips 15, as shown in Fig. 2. In the form shown, both of the edges of the strips 9 and 10 are held in position by this means and the sheets 12 and 13 are then bent over to conform to the rounded surface of the bottom of the pan end are held close upon the resistance innteriahhy suitable hands 19 and 20, suitably fixed to the strips 17) near the opposite ends of the pen. In a preferred form, the hands 19 and ii are proiidcd with interfitting ends, so they may look together and hold. the sheets 12 and. 13 firmiy upon the resistance materiel. As illustrated in Fig. 2, the strips 26, may he provided with ears 21, and the strips 19 may he slotted, as at 22, to receive these ton ces.

From toe foregoing description it is evident that the blight surfaced carrier 13 performs the dual function of supporting the resistor firmly in contactwith the snrface to he heated, thus producing more eilic' m conductivity of heat thereto and oh mining he'tter surface distribution of the heat and. by reason of the proper ies of polished surfaces as regards heat trevei. aiding in making the heat. insulation more e il'ectivc.

As illustrate? in. the resistance element proper consists of a suitable sheet of insulating material 10, upon which the re sistence nmtcriai is carried. In a preferred form, I employ 2: sheet of mice, since I find that this material is able to withstand the temperatures to which such :1. device is sub jected, and may he ohtained in extraordinarily thin sheets, being at the same time ieihle and Capable of being bent into any (issued shape. In a preferred form, I cover the sheet of 3-12: with thin coating of shellac. in this figure, ti lil'Shii HW'I? is preferably carried upon surface o the sheet 1G. 1t oln his 1" -:-1 tsncc nietci'iei may he of my In e preferred nc'm. ii wpl'g a resistance may torizii oi" UH. relies s f i wire i c mvoiutions acr ss the sh This ri c ed wire wound hack and forth across the sheet in substantially parallel rows. and at tin" edges of the sheet is passed. hetweci'i notches L3. These notches :ir'c pref rehl v fm'nied of varying depths, and as shown in Fig 2 may be arranged alternately in several series. two short notches being innnedieteiy between two long notches. The re'llexeiii wire is wound in l\(?i,.\'i8!i these notches on the opposite edges of the sheet, one of the cimvolutions passing to a short n it-h end then across on the back of the sheet to the next-short notch, while the other convolution passes between the two long noteheswvhich are between the two short notches, just mentioned. Any suitable circuit connections may be made for the resistance element; but in a preferred form, I form this element of two sections, so that it may be connected either in. series, or in parallel, to vary the heat as desired.

One method of connecting the unit is clearly shown in Figs. 6, 7, 8 and 9. As shown in these figures, two sections of re sistance wire 24 and '25, are arranged in parallel, and are connected with a lead 26, between the brzn'ichcs of the circuit, and lends 27 and leading otf from the lirmi-cncs 24 am In a preferred form, a series-parallel switch 29, of any desired construction, illustrated diagrammatically in these figures, is connected in circuit in the lead 26., and is adapted to change the connections of the leads :26, 27 and For ilr' stance, when it is desired to use the maximum heat from the heater the sections and 25 of the resistance are placed in pan aliel, as shown in Fig. t, the current passing through one side of the switch 29 to the conductor 26 and then dividing and passing in parallel through the two branches 24. and Q5 of the heating element to the other side of the iine. When it is desired to provide a medium heat, the circuit connections are preferably those shown in Fig. 7, wherein one of the sections of resistance is cut out, the circuit extending through the conductor '27, to the section 24:, and then through the conductor 26 and the switch 29 to the opposite side of the line. "When a still lower heat desired, the connections are those shown in Fig. wherein the current passes through the conductor 2 to the resistance section 24, resistance section 25), the conductor :28, and the switch 29 to the opposite side of the line. When it is desired to cut out ihe heater, the circuit connections are referoly those shown in Fig. 9, wherein t. e ter niinols of the switch are not bridged and the circuit opened. It is evident, however, that these circuit connections hereinahove desovihed may he changed if desired.

The conductors 26, 27 and 28 are attached to the resistance wire, as shown in Figs. 2 and 5, the ends of the conductors passing fin-or h suitable perforations 30, in one edge of the sheet 12: the conductor 26 being connected to the end of :1 convolution at one end of the resistance element, while the two conductors 27 and .2-8, are connected at the other end to the ends of adjacent convoiutions. The sheet 13, is provided with av suitable slot or cutaway portion 31, to rniit the passage of the conductors 2'? an 538 through the same. As shown in Fig. 5, the conductors may he attached to the ends of the refiexcd wires, by passing the ends of the conductors through suitable perforations 32, in the sheet 10, and binding the ends of the conductors to this sheet, by turning the ends reflexed resistance wire wound in convolutions upon an insulating base, and means for reflecting the heat waves generated by said unit and confining the same within the outer receptacle.

6. In an electric chocolate Warmer, an outer pan having a curved bottom, an inner chocolate pan arranged to extend into said outer pan and having a bottom of the same configuration as the bottom of said outer pan, and a heating pan intermediate said pans and of the same configuration as said pans, said heating pan including a heating unit of refiexed resistance wire wound upon an insulating base and inclosed between sheets oi insulation.

7. In an electric chocolate warmer, an outer pan having a curved bottom, aninner chocolate pan arranged to extend into said outer pan and having a bottom of the same configuration as the bottom of said outer pan, a heating pan intermediate said pans and of the same configuration as said pans, said heating pan including a heating unit of reflexed resistance wire wound upon an insulating base, and means for reflecting the heat waves generated by said-heating unit and retaining the same within said pans.

8. An electric heating pan for chocolate warmers, comprising a metallic pan, a heating unit therefor including a resistance wire carried upon an insulating base and inclosed between sheets of insulation, and means for holding said heating unit against one of the surfaces of said pans including an outer polished metallic srieet and transversely extending bands.

9. An electric heating pan for chocolate warmers, comprising a metallic pan, a heating unit therefor including a reflexed resistance wire wound in convolutions upon an insulating base and inclosed between sheets of insulation, and means including a metal sheet having a highly polished outer surface and transversely extending bands for holding said heating unit against the surface of said pan.

10. An electric heating pan for chocolate warmers, comprising a metallic pan, a heating unit therefor including a. resistance material carried upon an insulating base and inclosed between sheets of insulation, and means for compressing said unit against one of the surfaces of said pan including an outer metal sheet having a highly polished outer surface and transversely extending interfitting bands carried by said pan.

11. In an electric heating pan for chocolate warmers, a metallic pan, a heating unit therefor including a rellexed resistance wire wound in convolutions upon a mica base and inclosed between sheets of asbestos, and means including an outer metallic plate for holding the unit against one of the surfaces of said pan.

late warmers, a

12. In an electric heating pan for chocolate warmers, a metallic pan having a curved bottom, a heating unit therefor including a reflexed resistance wire wound upon a flexible insulating base and inolosed between sheets of insulation, and means for holding said heating unit snugly against the curved bottom of said pan, including an outer metal plate and transversely extending bands.

13. In an electric heating pan for chocomctallic pan having a curved bottom, a heating unit formed of convolutions of reflexed resistance wire, wound on an insulating base, sheets of insulation on both. sides of said heating unit, and means including an outer sheet for clamping said resistance unit and the sheets of insulation snugly against the curved surface of said pan.

14. In an electric heating pan for choco late warmers, a metallic pan, a heating unit therefor including a retlexed resistance wir wound in convolutions on a shellac covered mica base, and inclosed between sheets of asbestos, means for holding said unit against one of the surfaces of said pan including an outer metallic plate and transversely extending bands fixed to said pan, and means for permitting electrical connections to be made to said resistance material.

15. In an electric heating pan for chocolate warmers, a metallic pan, a heating unit therefor and means for holding the same against one of the surfaces of said pan in cluding a plurality of transversely extending bands, and a removable support for said bands carried by said pan.

16. In an electric heating pan for chocolate warmers, a metallic pan, a heating unit therefor including a resistance material wound upon an insulating base and inclosed between sheets of insulation, means for compressing said resistance unit against one or the surfaces of said pan including anouter metallic sheet and transversely extending bands, and removable supports for said bands carried by saidpan.

17. In an electric chocolate warmer, the combination of a chocolate pan, an outer pan into which said chocolate pan extends, an electric heating pan between said chocolate pan and said outer pan, and means for reflecting the heat waves generated by said heating unit.

18. In an electric chocolate warmer, the combination of a chocolate pan having a curved bottom, an outer pan having a similar bottom and arranged to receive said chocolate pan, a heating pan arranged to be received between said chocolate pan and said outer pan, and means for reflecting the heat waves generated by said heating pan and retaining the same within said pans.

19. In an electric chocolate warmer, the

combination of a plurality of nested pans having curved bottoms, a heating pan having a similarly shaped bottom, fitted between said pans, means for varying the heat generated by said heating pan as desired, electrical terminal connections carried by said outer pan, and means for retaining within said pans the heat generated by said heatin pan.

20. ii an electric chocolate warmer, the combination of a chocolate pan, an outer inclosing pan, a heating pan nested between said previously mentioned pans, means for graduating the heat generated by said heating pan as desired, and means including highly polished surfaces on certain of said pans for reflecting the heat generated by said heating pan and retaining the same within said pans.

21. In an electric chocolate Warmer, the combination of an electrically heated receptaclej for containing chocolate and inaintairr ing it in heated condition, an electrically heated-fiat side pan adjacent thereto, and a flange or apron on said receptacle overlying the edge of the side pan for preventing leakage during the transfer of chocolate from the receptacle to the side pan.

' 22. In a device of the class described, an electrically heated vessel for maintaining the contents in heated condition, said vessel having an approximately cylindrical bottom and having one of its upper edges substantially horizontal and rectilinear, an electrically heated substantially fiat side pan whereon the material from the vessel may be manipulated by the operator, and interfitting connections between one edge of the side pan and said rectilinear edge of said vessel to thereby prevent leakage during transfer of said material from the vessel to the side pan.

23. In an electric heating device, a receptacle having a convex outer surface, a heating element, and a bright surfaced carrier side of said resistor and means for holding said metallic sheet close against said resistor, for the purpose described, said resistor being suitably insulated from said receptacle and from said metallic sheet.

25. In combination, a receptacle having a cylindrical bottom, insulating materialadjacent thereto, an electric heating element adjacent to said insulating material, outer insulating material adjacent to said heating element on the outside thereof and a sheet of polished metal outside of said outer insulating material holding the parts within in close contact with each other.

26. In combination, a metallic receptacle having a bottom which is convex on the outside, a plurality of laye s of insulating material outside of the bottom of said receptacle, a resistor interposed between two of said layers and a sheet of bright tin holding the parts mentioned in close contact with each other to thereby perform the dual function of supporting the resistor and its insulation and minimizing the heat loss.

27. A warmer comprising a metallic receptacle having a rounded bottom, a refleXed resistor external thereto, insulation outside 1 of said resistor, and a metallic sheet, bright inside and out, pressing said insulation toward said receptacle.

In witness whereof, I have hereunto subscribed my name in the presence of two Wit-

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