US1550979A - Electric-stove heater element - Google Patents

Description

Aug. 25, I925. 1,550,979

R. H. ME'CINNES' ELECTRIC STOVE HEATER ELEMENT Filed Aug. 18, 1924 1 2 Sheets Sheet l u-u@n@u@n m H Patented Aug. 25, 1925.

UNITED STATES ROBERT H. MAGINNES, OF HAMILTON, ONTARIO, CANADA, ASSIGNOR TO 1). MOORE COM- PANY, LIMITED, OF HAMILTON, ONTARIO, CANADA.

ELECTRIC-STOVE HEATER ELEMENT.

Application filed August 18, 1924. Serial No. 732,749.

To all whom it may concern-.-

Be it known that ROBERT H. MACINNES, a subject of the King of Great Britain, residing at Hamilton, in the county of Wentworth and Province of Ontario, Canada, has invented certain new and useful Improvements in an Electric-Stove Heater Element, of which the following is a specification.

This invention relates to electric stoves and has special reference to a heater element, sometimes called a burner for such stoves.

One important object of the invention is to improve the general construct-ion of devices of this character so that the element constitutes a unitary structure of novel arrangement especially adapted for use as a closed top heater element.

A second important obj ect of the invention is to provide an improved form of such heater element wherein the several parts are so constructed and arranged that they may be readily assembled in manufacture or disassembled for repairs or replacements.

A third important object of the invention is to provide an improved form of such element having its casing or supporting frame so arranged as to be readily separated to afford access to the resistance coils used therewith.

lVith the above and other objects in view as will be hereinafter apparent, the invention consists in general of certain novel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawings and specifically claimed.

In the accompanying drawings like characters of reference indicate like parts in the several views, and:

Figure 1 is a plan view of a circular element constructed in accordance with this invention, the top being removed.

Figure 2 is a diametrical section through such an element.

Figure 3 is a plan view of a rectangular element without a casing.

Figure 4 is a front view thereof.

Figure 5 is a section on the line 55 of Figure 3.

Figure 6 is an enlarged detail section on the line 6-6 of Figure 5.

The casing for the burner is of shallow hollow cylindrical shape to form a smaller lower portion 1.0 and a larger upper portion 11 connected by flange 12 having o enin 13 through which project downwardly legs 14 depending from a cap or cover 15 having a peripheral skirt or flange: 16. Through the lower ends of the legs extend cotters 17 which thus hold the top removably on the casing.

Disposed centrally of the bottom of the casing is an upwardly projecting boss 18 the upper end of which fits in a recess 19 formed in a lower heater plate 20 which rests, at its periphery, on legs 21 formed in the casing bottom. Above the recess 19, the lower heater plate is provided with an upstanding boss 22 over which fits the central opening 23 of an upper heater plate 24, having radial slots 25 and a downturned flanged peripheral edge 26 which rests on the periphery of the lower heater plate.

Between the two plates are received the flanges 27 which project from the heads 28 of refractory insulating resistance supports 29 of inverted T-shaped in cross section. These heads fit the radial slots 25 and the bars are provided with spaced openings 30 through which is led the coiled resistance wire 31. Tapping conduits 32 are provided at the ends and central point of the resistance which extend down through the bottom of the casing for convenience in connecting the leads.

In the rectangular form of the device it is preferred that the slots 25 be parallel and that the lower plate 20 be provided on 0pposite edges with inturned lips 33 beneath which corresponding edges of the upper plate 24 may engage. In this manner the said inturned lips and the corresponding edges of the upper plate 24 constitute slidably interlocking elements.

Furthermore stops 34 are provided to limit the movement of the upper plate in one direction. With this form the casing will, of course, be rectangular, if it is desired to use the same, as shown at 35 in Figure 4. Moreover, by making the bars 29 in short sections any breaka-ges are much less extensively replaced.

There has thus been provided a simple and efficient 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 invention, What is claimed as new, is:

1. In an electric heating element, a lower plate, an upper plate having slots therein, refractory insulating bars lraving webs and flanges with the webs projecting upward through said slots and the flanges engaged between. the plates, and a resistance coil supported by said webs.

2. In an electric heating element, a lower plate, an upper plate having slots therein, downwardly bent edge portions on. said upper plate to hold the central portion thereof in spaced relation to the lower plate, refractory insulating bars hlaving webs and flanges with the webs projecting upward through said slots and the flanges engaged between the plates, and a resistance coil supported by said webs.

3. In an electric heating element, a lower plate, an upper plate having slots the-rein, refractory insulating bars having webs and flanges with the webs projecting upward through said slots and the flanges engaged between the plates, a resistance coil supported by said webs, and slidably interlocking elements on the edge portions of said plates to hold the detachable plates together.

4. In an electric heating element, a lower plate, an upper plate having slots therein, downwardly bent edge portions on said upper plate to hold the central portion thereof in spaced relation to the lower plate, refractory insulating bars having webs and flanges with the Webs projecting upward through said slots and the flanges engaged between the plates, a resistance coil support-' ed by said webs, and slidably interlocking elements on the edge portions of said plates to hold the detachable plates together.

5. In an electric heating element, a lower plate, an upper plate having slots therein, refractory insulating bars having webs and flanges with the webs projecting upward through said slots and the flanges engaged between the plates, a resistance coil supported by said webs, slidably interlocking elements on the edge portions of said plates to hold the detachable plates together, a shallow receptacle wherein said plates and bars are received, and a top detaclrably attached to the receptacle.

6. In an electric heating element, a lower plate, an upper plate having slots therein, downwardly bent edge portions on said upper plate to hold the central portion thereof in spaced relation to the lower plate, refractory insulating bars having webs and flanges with the webs projecting upward through said slots and the flanges engaged between the plates, a resistance coil supported by said webs, slidably interlocking elements on the edge portions of said plates to hold the detachable plates together, a shallow receptacle wherein said plates and bars are received, and a top detachably attached to the receptacle.

In testimony whereof I have aflixed my signature.

ROBERT H. MAoINNES.

Images