US1543938A - Electric-stove heater element - Google Patents

Description

June 30,1925. 1,543,938

I R. H. M I NNES ELECTRIC STOVE-HEATER ELEMENT Filed 1 811 1925 3 Sheets-Sheet l A TTURNEY June 30,1925.

R. H. Ma lNNES 5 Sheets Filed Feb, 1925 INVENTOR.

ATTORNEYS June 30, 1925. 1,543,938

R. H. M lNNES ELECTRIC STOVE PBATER ELEMENT Filed Feb, 9 19,25 1 s Sheets-Sheet s I I ll 1! f X H 35 l Z I] 1; 1' I I// l I O f 4 [I f 66 1 S INVENTOR F W MW ATTORN s.

, Patented June 30, 1925.

UNITED S A ES 1,543,938 PATENT OFFICE.

manner 3;

MAOINNES, OF HAMILTON, ONTARIO,v CANADA, ASSIGNOR TO I). MOORE COMPANY, LIMITED, OF HAMILTON, ONTARIO, CANADA- mnc'ralc-srovn miarna Application fled February 9, 1925. ser al No. 7,904

10 This invention relates to heating elements or, as they are commonly called, burners for electric stoves. c

It is to be noted here that the term humor will be used as a whole while the terms heatinglelement or heater element wherever used erein are to be understood as referring to the resistance' wire which is the part actually heated 2 to working eflicienc by the passage of'a current therethrougl i.

With this in mind one principal object of the invention is the'provision of an improved general construction of burner for 25 the purpose set forth. i V A second important'object'of the inveni tion is to provide a novel construction 'of supporting plate and heater element suportin bars for burners of this'class.

,is to provide an improved arrangement of heater element support tors in such a burner.

With the above and other objects in view 35 as will be hereinafter ap arent the invens tion consists in general 0 certam novel details of construction and combinations 0 arts hereinafter fully described, illustrated in the accompanyingdrawings and specifi- 40 cally claimed. I

In the accompanyin drawings lilre charactors of reference ndicate like parts in the several views, and:

Figure 1 is a plan view of a square or oven 4| burner constructed in accordance with this invention. a 1 re a $3 1. i igure l is a section on Fi re 1.

ignre is burner constructed in accordance with this inventlon, a portion of the bottom casing 2 is aside view thereof. 3 is a section on the line 3-3 of theline 4-4 of l I and a portion of the refractory insulating throughout this specification and the claims to indicate the device f side ed a bottom plan view of a round plate being each broken away, the better to show the invention.

Figure (5 is a section on the line 6-6 of Fi ure 5.

iigure 7 isa' bottom plan view of a portion of the casing bottom showing the openv in? for the lead in blocks.

igure 8 is aside view of the lead in supporting blocks and one of the heater element supporting bars associated therewith. t

Figure 9 is a top plan view of the burner with the casing left ofl'.'

Figure 10 "s a perspective view of oneform of supporting bar.

Figure 11' is a similar view of a second form of bar. i

In the form of theinvention shown in i ig'guresv 1 to 4 there is disclosed a rectangular frame having a front member 10', a rear member 11 carrying hinge lugs 12 by means ofwhich the frame may be hinged to the top or bottom of an oven, and side members 13. Supported above these side members by ribs 14 is a plate 15 provided each hinge the respective side members are .Jeachprovided with an opening 17 to re- I --c'eive the U A third important object of the'invention and lead in insulal The heater element supporting bars in this form of the device are preferably square ended and are made in short sections each having a base 21 provided with channelled es and an upstanding .rib 22 provided with suitable openings through which may be led the heater element'23. Several of these supporting bars are slid into each slot 16, being retained in position by the strips 19 after being assembled and it is to formed of insulating material, porcelain being preferred for the purpose.

In the form of the invention shown in Fi res 5 to 9 a round burner is disclosed suc as is suitable for stove tops, hot plates and the "like. In this form there is rovided a-casin consisting of a lower pan e member 24 aving around its rim a rabbet wherein fits the depending flange 25 of a casing top 26. This casing top is provided with a dependin centralstem Q'Iwha-ein is fitted a stud be t 28 which passes through a cenbenoted that these supporting bars are these and the trally disposed opening in the lower member 2ato permit a nut 29 to be screwed thereon and thus hold the top securely on. Resting on the bottom of the member 2d is a pad 30 of some suitable material which may act as an insulator for heat and asbestos has been found well adapted for the purpose in this case.

At31 is a supporting plate which carries the heater element supporting bars and this plate consists of a disk like body having a central opening 32 to permit the stem 27 to pass therethrough. On the lower side of the plate are supporting legs 33 which pass through suitable openings in the asbestos disk 30 and engage the bottom of the member 24' to hold the supporting plate in spaced relation to said bottom. On the upper side of this plate a rib 3i surrounds the opening 32 and this rib preferably forms an octagonal structure. Slots 35 extend inwardly from the periphery of the plate and terminate at the rib in square ends. Intermediate these slots are shorter slots 36 and between slots 36 and 37 terminate in V-shaped ends. The supporting bars in this form of the device are very similar to that in the form first described, each having a base 38 provided with channeled side edges, the channels receiving the edges of the plate at the slots, and an upstanding rib 39. It is to be noted, however that the bases of those supporting bars received in the slots 36 and 37 are shorter than the ribs so that eight of the ribs are long enough to reach the rib 3d and the bases, above the channel also extend to the rib 34, the remaining ribs bein short but yet extending-inwardly beyond their bases. Each of the ribs is provided with suitable openings 40 for reception of a spirally wound heater element 41.

Mounted on the under side of one of the supporting bar bases are lead-in blocks 42 which project downwardly through suitable openings 43 formed in the bottom of the member 24 and these lead-in blocks are provided with passages or openings 44. for the lead wires from the heater element. blocks are also provided with binding posts and nuts 45. Both the blocks and the bars are made in this form of electric insulating material, preferably porcelain.

It will be plain from the foregoing that, with the unitary. constructions now described,great ease of assembling the bars in the burners is obtained and that breakage of one or more of the bar units may be repaired at very little expense. It will also be obvious that these relatively small units are much cheaper to manufacture than the large porcelain plates commonly used and that the expense due to wast-age during manufacture will be reduced to a very small percentage of that ex erienced with the usual large plates. urthermore these These edges of the plate at the side small independent unit bars are much less liable to crack, on accountof unequal expansion when heated, than the large plates.

There has thus been provided a simple and efiicient device of the kind described and for the purpose specified.

It is obvious that minor changes may be made in the form and construction of the invention without departing from the material spirit thereof. It is not, therefore, desired to confine the invention to the exact form herein shown and described, but it is desired to include all such as properly come within the scope claimed.

Having thus described the what is claimed as new, is:

1. In a device of the kind described,'a supporting plate having slots extending inwardly from its edge, and heating element supporting bars each having a base provided with channels in its side edges to receive the edges of the plate at the side of the slots, said bars being engaged in said slots.

'2. In a device of the kind described, a supporting plate having slots extendinginwardly from its edge, and heating element supporting bars each having a base provided with channels in its side edges to receive the edges of the plate et the side of the slots, said bars being engaged in said slots, said invention,

bars further having longitudinally extending ribs provided with openings wherethrough a heater element may be led.

3. In a device of the kind described, a supporting plate having slots extending inwardly from its ed hcatin element supporting bars each aving a llase provided with channels in its side edges to receive the of the slots, said bars being engaged in said slots, said bars further having longitudinally extending ribs provided with openings wherethrough a heater element may be led, and a heater element reeved through the openlIlgS.

4'. In a device of the kind described, a supporting plate havin slots extending inwardly from its edge, eating element supporting bars each having a base provided with channels in its side edges to receive the edges of the plate at the side of the slots, said bars being engaged in" said slots, and means to prevent accidental displacement of said bars from said slots.

5. In a device of the? kind described, a supporting plate havin slots extending inwardly from its edge, eating element supporting bars each having a base provided with channels in its side edges toreceive the edges of the plate'at the side of the slots, said bars being engaged in said slots, said bars further having longitudinally extending ribs provided with openings wherethrough a heater element may be led, and

means to prevent accidental displacement of said bars from said slots.

6. In a device of the kind described a supporting plate havin slots extending inwardly from its edge, eatin element supporting bars each aving a ase provided with channels in its side edges to receive the edges of the plate at the side of the slots, said bars being engaged in said slots, said bars further having longitudinall extendin ribs provided with ooeni w eret hr'oug a heater element ma .led, a heater element reeved thro h t e 0(penings, and means to prevent acci ental isplaceslots, said bars being ment of said bars from said slots;

7. In a device of the kind described, a

supporting plate having slots extending inwardly from its ed heatin element supportin bars each aving a ase provided with c annels in its side the edges of the plate at the engaged in said slots,

edges to receive .side of theand lead-in blocks carried by the base of one of said bars and depending therefrom.

8. In a device of the kind described, a supporting plate "having slots extending inwardly from its sugportmfg bars each having aase provi ed wit channels in its si e edges to receive the edges of the plate at the side of the slots, said bars being engaged in' said slots, lead-in blocks carried by the base of one of said bars and depending therefrom, and a casing surrounding said plate to prevent escape of said bars from said slots and having '0 nings in its bottom wherethrough said lea -in b ocks pass.

In testimony whereof signature.

I have aflixed' mv ROBERT H. MAQINN'ES.

Witnesses: e

' H. G. H.mmnY,

V. D. EABLI.

edge, heatin element 7 i

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