US1436034A - Electpvic heating unit ob hot plate - Google Patents

Description

L. R. HAMLIN. ELECTRIC HEATING UNI? 08 HOT PLATE.

APPIJCATIDN FILED APR. .1921.

Patented Nov. 21, 1922.

Patented Nov. 21, 1922.

UNITED STATES LOUIS E. HAMLIN, OI EOE-M0, INDIANA,

ASSIG-HOB 1'0 THE GLOBE STDVE 6a RANGE comm, or xoxonro, IH'DIANL ELECTRIC HEATINGUNIT 0B HOT PLATE.

- s lieenonuieu Toall whomitnwycorwgrms j Be it known that I LornsR. HAKDIN a" citmen of the United tetes, rcsidin at okomo, Howard (County, Stateof diaLns,

a have invented certain new and useful Impg'ovements in Electric Units 'or Hot lates, of which the follewing'iss, specification. 2 1.

This invention relates to improvements in electric heating nnitsor holgp'vletes. f

- The main 0b100l3- off this-invention are:

First," toprqvide an improved' electric heating unit'or hot pl ute in' which the grooves for the heati' coil as to elfectivelyretain el'reeting coils- Second, to provide an improved heating unit or hot plate in which ends of the coils ily connected. Third,

plate for heating units;

liurther' objects, and structural details, defimtely appear m the detailed description to follow.

I accomplish the objects of my 1nvention by the device and means described 111 the following ecificationil The invention is clearly de nod and pointed out ui'th'e claims. A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing, forming a part of this sp cation, in which;

Fig, I is a, top view of my improyed heating unit, portions only of the coils being 85 shown.

Fi I1 is a. vertical section on a. line comspon g to the broken line 2-2 of Fig. I. In the drawing similar reference-characters refer to similar parts throughout the 40 several views.

Referring to plate 1 is formed commonly of pores] the drawing, the insulating of suitable insulating matens-l, ein. The plate has a plurality of zig-zagged coil ves m 5 its face, the plate illustrated having two grooves. The outward and return reaches of the outer groove are designated by the numerals 2 and 3, respectively. grooves are tapered outwardly, that is, they so are wider at the top than at the bottom.

The outward and return reaches of the outer coil groove are in the strueturp illustmted concentrically disposed. The outward and return reaches 4 and 5, respec- I56 tively, of the inner coil grooves each comthe coils drawingthe moves and before sjcre soformed R of the center wall of ner coil 11 is laid in the inner coil groove, the-terrnhials or' areso disposed as to beireedto provide en improved insulating d saster to the grooves so that they are held April 11,1921. serial No. 460,588.

prise e plurality of segmental loops disposed oppositely of the center 6 of the plate.

' At the ends of the grooves the plate is pr vided with holes 7 for the binding posts 8. The ends 9 of the grooved walls around -which the coils are looped ere undercut as shown in Fig. II to prevent the tension on them out of the grooves, particularly when the coils are first laid in the current has been 1edthereto.'-

he outer coil 10 is laid in the outer and teaches? and 3 of the outergroove withf ts'bight engaging the undercut end 9 these grooves. The in which as stated,comprises the outer and return reaches each formed of a plurality of segmental 100 s, and engages with the undercut-ends o the center wells of the loops of this inner groove so that it is likewise efi'ectively retained. 4

The angles forming the '/,i lugs-in the groo'vesere disposed in radial n inement, the coils are'strtched slightly when placed in in binding engagement with the angles formed by the ziii'zeug. When heated and cooled. the coils ta e permanent set conforming to the grooves and are held therein without other securing means than that provided by the zigzegd grooves and the undercut ends describe The ends of the coils are provided with clips 12 which are engaged i ts.

fih g coils mav be easily removed if desired and new coils positioned by an unskilled person.

My improved hot plate is very economical to produce as it may be readily molded, is not likely to be broken and the coils may he quickly placed therein and are effectively retained as stated without attaching means other than is provided by the plate itself.

A further advantage of this construction is that by changing the size of the wire the plate can be adapted for a. 110 or 220 volt usage. The arrangement of the reaches of the grooves rovides a plate of large capacity and the inner coil is of suitable length, being equal to or greater in length then the outer coil, which is a feature of substantial advantage My improved heating use in various relations.

with hindunit is desirable for I have not attemptand each comprisingnplurality o ed to illustrate the'various adaptations and ing outward and return reacheseach comapplications thereof, as I believe they will prising e plurality of segmental loops. 40 he understood by those skilled in the art to 5 An insulating plate for electric heatwhich myinvention relatesi v ing units having g. zig-zagged coil groove Having thusde'scribed my invent on, whet comprising outward and return reaches, a I claim as new and desireto secur y coil disposed in said groove and engaged ters Patent, is: with the several angles thereof, the end of 1. In an electric heiltl'lig' unit, he comblthe center wall of the grooves around which nation of a porcelain lai te'hgllngml er'and the coiluis looped being undercut. i r zig-zagged coi grooves, the enter 6. An insulat' 0 plate for electric heating groove comprising outward and re urn units having a zig-zagged coil groove comreaches, the inner-groove "comprising -out-. prisingloutvmrd and return reaches, 9; coil ward end-return reachesidisposed ippositely ydisposedfih,said ,gmovaand engaged with segmem the several'anglesthereof. tal loops, the ends of the center walls ofthe- '7.- Air-insular my: plate for electric heating grooves arbundwhicli the bights-of the coils: units "having a. plurality of zi -za ged coil .-enga; e being..undercut. grooves, the ends'of thewalls oi sai grooves "2. an electric;heating-unit; the comaround which the coils are looped being ungfbination ofi-e porcelein plete-havingouter dercutv Mend inner zig-zeggedmoil grooves,-the outer 8. In an electric heating unit, the combigroove com rising concentrically j disposed nation ofran insulating plate having a zigoutward an returnree'che's the mnergrooye zegged coil cm, the walls of which con comprising outward and return,.-reaches-d1sverge inwar l ,--a nd a coil arranged-in said rehty 1n smd'grooves'.

posed.o positely nd=e qheomprisin' a plugroove aroun .the angles of the zig-zags,

' o segmental loopsgia'ndlcoils lsposed all coectingfor the purpose specified.

t v In an-electric heetinp unit, the combi- "3. In an electric-heating unit, the combi-- nation of an 'insulatingplate having a. zi

-na.tion-of a,- oroeleinl lete hevmg-epluraL-z aged coil igroovej and a coil arranged in ityof zi'g zagged -co grooves @0111 rising sax groove around the angles ofthe zigoutward and return-reaches, and coils disz'a s, ,a.ll coacting for the purpose specified. posed'insaid grooves, the enclsof thegroove n witness whereof I have hereunto set walls around which the ceils-are-loopedjhe=- my-hand andfseal in the presence of, two ing undercut. .j; witnesses. Y

: 4. An insuletin plate for-heating units R AMLIN [L 8] having a. plum ty offlzig-zagged coil grooves, there beinlg sen-outer groove com- Witnesses:

prising concentrica y disposed outward and F. Onrmr,

return reaches and an inner groove compris Ennns'r D. Gena.

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