US 1700087 A
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Description (OCR text may contain errors)
ATTORN EY INVENTOR Jam. 22, 1929. 0
Patented Jan. 22, 1929.
BENJAMIN F. SLADE, OF PIOCI-IE, NEVADA.
Application filed February 1, 1928. Serial No. 251,176.
This invention relates to heating devices which embody a combined support and hot plate.
An obiect of the invention contemplates a hous carried by the support adapted to provide a vacuum conpartinent for the heating element to prevent oxidizing,
lVith the above and other objects in view, the invention further consists of the following novel features and details of construction, to be hereinafter more fully described, illustrated in the accompanying drawing and pointed out in the appended claims.
In the drawing Figure 1 is a sectional view taken through the invention.
Figure 2 is a sectional view taken on line 2-2 of Figure 1.
Figure 3 is a side elevation of the invention.
Figure l is a diagrammatic plan view of the heating element and circuit therefor.
As generally known in the manufacture of incandescent lamp bulbs, a vacuum compartment is required for the bulb filament. lhen the bulb becomes broken or loosened from the socket portion and the vacuum destroyed, the filament becomes oxidized and the bulb rendered useless for lighting purposes.
In the different types of electric heating I devices, the heating elements are provided with larger and stronger filaments adapted to repulse oxidizing to an appreciable extent. The main difliculty, as experienced in the heating devices now used, resides in the fact that vacuum compartments are not provided to house the heating elements or filaments. Oxidation is noticed both at the filament and the feed wires therefor.
In carrying out the invention, I provideJ inner and outer housing members 10 and 11 respectively. The latter is provided with supporting legs 12 to support the outer housing 11 in an elevated position. An outstanding annular flange 13 is carried upon the upper periphery of the outer housing 11, the purpose of which will be presently apparent.
Portions of the side walls of the inner housing member 10 are outwardly flared, as indicated at 14 and which terminate in outstanding annular flange portions 15 upon the uppermost edges thereof and which are adapted to be disposed in superimposed relation with the outstanding iiange 13 of the outermost housing member 11. A dielectric plate 16 is beveled, as indicated at 17, upon the outer side edges 'thereof to support the plate 16 upon the flared side wall portion 14 of the inner housing member 10.
A cover 18 carried upon the upper side of the dielectric plate 16 is bent upon itself at the peripheral edges thereof to provide a channel portion 19, adapted to receive the superimposed outstanding flange portions 13 and 15 respectively. A heating element or filament 20 is carried upon the under side of the dielectric plate 16 and which is provided with acks or other outlets as at 21.
From the diagrammatic plan view in Figure 3 of the drawing, it is to be noted that a set of three jacks is provided, which are adapted to selectively receive a pair of liaclr posts, such as indicated at 22. By such reception, an individual jack plug, connected to any one of the jacks 21, would give a low heat whereas the second jack plug connected to the adjacent jack would give medium heat whereas if the jack plugs were connected to the rst and last of the jack plugs, a high or intensive heat would be given, in that the whole filament or heating element would be used.
After the device has been completed, in the manner aforementioned, a hole is drilled in the hot plate or in the outermost housing member 11 and the heating element or filament called into use. rIhe heat generated by the heating element will expel air from the hot plate or housing` and when ali of the air has been expelled, the holes are then sealed as well as the lid upon the 'flange portions of the respective housings. Vacuum compartments are thus provided which will prevent oxidizing of the heating element or filament.
The advantage of having two vacuum compartments is that one, namely, the innermost housing member 10 will prevent the heating element or filament from becoming oxidized through contact with atmospheric conditions, whereas the second or outermost housing member 11 would prevent the heat from escaping below the cover 18 and dielectric plate 16, whereby the heat would pass from the heating element or filament Cir through the dielectric plate and cover 18 to heat the contents of a receptacle supported thereon.
The invention is susceptible of various changes in its form, proportions and minor details of construction, and the right is herein reserved to make such changes as properly fall Within the scope of the appended claims.
Having described the invention, What is claimed is:-
l. A heating device comprising acompartment7 a heating element carried thereby, a cover closing the heating element Within the housing being adapted te provide a Avacuum compartment to prevent oxidation of the heating element, and a second housing member adapted to receive the iirst mentioned housinv' and heating element being adapted to prevent leakage of heat through the first mentioned housing member.
2. A heating device comprising inner and outer housing members? iange portions carried upon the peripheries of each of the housing members being adapted for overlapping relation, a heating element carried Within the innermost of the housing members, and a cover provided With a channeled periphery adapted to receive the flange portions of the housing member to protect the heating element from atmospheric condi# tiens.
3. A l'icating device comprising inner and outer housing members, a flange outstanding upon the upper periphery of the outermost housing member, flared side Wall portions carried by the innermost housing member terminate to provide outstanding' lianve portions adapted for overlapping relation upon the first .mentioned flange portions, a dielectric plate having beveled side edges being adapted to be seated upon the flared side wall portions, a heating element carried upon the reticulated plate, a cover plate lyflush against the upper side of the reticulated plate, and a channel port-ion carried upon the peripheral edges of the plate adapted to receive the overlapping liange portions oit the housing members to prevent injury to the heating element through contact with atmospheric conditions.
In vtestimony Whereoll I aiX my signature.
Bentini/uu r. sLADE.