US1123789A - Electric heating element. - Google Patents

Description

E. J. M. PARKE & E. D. BRAND.

ELECTRIC HEATING ELEMENT. APPLICATION FILED DEO.11,'1913.

Patented Jan. 55,1915.

INVENTORS.

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B it known that we, Ronmnon Josnrn. liacDoa-ano PARKE and EDWARD Davm BRAND, of the city of Toronto, in the Province of Ontario, Canada, have invented certain new and useful Improvements in Electrio Heating Elements, of which the following is a specification.

This invention relates toheating' elements particularly adapted for electrical cooking apparatus and'our object is to devise a. simple and effective element which may readily, and without change of the main parts, be provided with any desired resistance and in which the resistance is easily and quickly renewable at any time.

We attain our object by forming the frame of the element as a metal spider the ribs of which are provided with open notches which are closed by means of a cover plate also shaped 4 a spider. Through these notches the re ance is coiled, being insulated from the metal by means of spools of porcelain or other non-conducting heat resisting material substantially as hereinafter described and illustrated in the accompanying drawings in which- Figure-1 is a plan view of the frame of the element; Fig. 2 is a plan viewof the cover; Fig. 3 a cross section of the complete arrangement; Fig. 4 aplan view of the complete arrangement; Fig.5 an enlarged cross section showing the method of insulat ing the resistance; Fig. 6 is a plan view of v the under side of part of the element with the metal bottom in place; and Fig. 7 is a side elevation showing the metal bottom in place. a Y

. In the drawings like numerals of refercnce indicate corresponding parts in the. dilierent figures of the drawings.

The frame of the heating, element comprises a spider 1 preferably of cast metal and provided with any suitable number of radial arms 2. These armsare provided with the open notches 3 whichmay be closed" by means of the cover 4 which is'also formed as a spider and preferably of .cast metal. This cover is held in place by bolts 5;so me of which may be used to holdin placc'ih'e feet 6011 whicl'l the element may. he supported. The resistance may be of any suitable type preferably a coil 7 formed of one of the well known resistance alloys. The resistance is laid in the notches as indicated 'in Figs. 3 andjl. Asufiicienjt number of Specification of Letters Patent? Patented Jam. 5, 1915,

.pplication filed December 11, 1913. '--.Seria1 No. 806,051

notches are provided so that any desired length of resistance may be laid therein. In I Fig. 4 we show in dotted lines two coils of the resistance. As four notches are shown in eacharm it is evident that, with the construction illustrated, any number of coils of the resistance from one to four may be laid in place so that the heating arrangement with any desired amount of resistance, 5

within the predetermined limits, may be constructed with the one set of parts. The resistance is insulated from the arms by means of the spools 8 which fit in the notches as indicatedparticularly in Figs. 3 and 5.

For convenience, resistances may be made up in shape ready to drop intoposition when the cover 4 is removed, thus making the renewing of a burnt out resistance a simple operation.

The terminals 9 are supported on the insulating block 11, which is spool shaped and fitted in a notch in the rim of the spider, being held in place by the cover in 30' exactly the same way as the spools insulating the resistance are carried in the ribs of the spider. The contact fingers 12 depend from the terminals and project below the bottom of the spider, whereby they may be 35 inserted in a socket which is horizontally disposed. The heating element will t us be dropped into place and the electric connections made by downward pressure and disconnected by an upward pull, thus completely overcoming the tendency to bend the contact fingers when the heating element has to be connected with asocket laterally directed.

In Figs. 6 and 7 we show a metal bottom 10 applied tothe element intended to catch crumbs and dirt which may fall through the spider. This metal bottom is provided with the spring'fingers 1 adapted to frictionally engage the rim of the spider as 1 6 shown in Fig. 7. Preferably a little 'pin or projection 13 is provided to increase the frictional grip of the fingers 14, these pins being cast in or otherwise formed in the rim.

The bottom is cut out beneath the bolts 5 5 as' indicated at 15. When this bottom is used. the -feet 6 will not be employed. I What we claim as our invention is 1. A; heating element comprising a metal spider having open notches'formed in'its 11g 1 ribs; a resistance coiled through said notches; and insulating spools lymg. 111 said notches and thi 4gb whichisaid resistance passes. a

2. A heating element comprising a metal spider having open notches formed in its ribs; a spider shaped cover closing said notches; a recess for a contact insulating block being formed between the spider and the COVl', a resistance coiled through said notches; insulating spools lying in said notches and through which said resistance passes; and a spider shaped cover closing said notches. 1

3. A heating element provided with a metal frame and a cover having a recess between them closed when the parts are in 115 juxtaposition and open when they are separated; an insulating block removably held in said recess, and provided with contact fingers.

Toronto this l lthday of Now, A. D. 1913. 20

, RODERICK J. M. PARKE.

EDWARD D. BRAND.

Signed in the presence of J. Emv. MAYBEE, Geo. P. MACKIE.

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