US379822A - Electric heater - Google Patents

Description

(No Model.)

C. SEILEBh? ELECTRIC HEATER.

Patented Mam. 20, 1888.

N. PUERS. Phumbahogrnpher. walhingmn, D. C.

UNITED STATES PATENT OFFICE.

CARL SEILER, OF PHILADELPHIA, PENNSYLVANIA.

ELECTRIC HEATER.

SPECIFICATION forming part of Letters Patent No. 379,822, dated March 20, 1888.

Application filed December 22, 1887. Serial No. 258,672. (No model.)

To all whom t may concern.-

Be it known that I, CARL SEILEE, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Electric Heaters, of which the following is a specification.

My invention relates to the production of heat by passing acurrent of electricity through a conductor'of high resistance; andthe object of my invention is to provide an electric heater of this character for the production of heat for domestic and industrial purposes, with the View of getting the best possible heating effeet with the simplest construction.

In the accompanying drawings, Figure 1 is a plan view of my improved electric heater in its preferred form. Fig. 2 is a longitudinal section on the line 1 2, Fig. 1.

One of the-main features of my invention consists in so combining the conductor, which is to be heated to redness by the current of electricity passed through it, with a large ra; diating-surface of nre-proof insulating material as to get a better heating effect than can be obtained from the heating of the conductor alone. For this purpose I provide the radiating-surface with a number of projections of suitable character, around and in contact with which the heating-conductors are placed, and the radiating-surface is of such character as to be capable oi' itself becoming heated by contact of the heated conductors. As the most convenient way of constructing the radiatingsurface, I make these projections in the form of cones, which are preferably made detachable, as hereinafter described.

In connection with heating-coils, a regulating device isprovided to control the amount of current supplied, and consequently the amount of heat to be obtained.

In the apparatus illustrated in the accompanying drawings, A is a plate of fire-proof insulating material lying on the bottom of a shallow metal trough, B. On this plate are the cones D, which, as I have said, are preferably made separate or detachable from the plate A, for convenience of repair oralterations. Like the plate A, these cones are made of a material which is fire-proof and an insulator of electricity, and in the case of the cones the material must also be of such a character as to be capable of taking the heat of the conductors and of becoming red-hot when the conductors are heated to a red heat. The material used may be porcelain, nre-brick, or other material which will answer the requisites named. A piece of Wire, E, made of platina or other suitable refractory material, iswound around each one of the cones in a double spiral, as shown in the drawings. The

terminals of each coil are connected to the terminals of adjoining coils, preferably through the medium of metal plates F, which at the same time separate adjoining cones from each other.

These plates F are secured in place by screws f, so that the terminals of the wires may be thereby clamped between the plates. rI he adjoining coils E are preferably connected up' in series by means of these clamps, as illustrated in Fig. 1, and as many cones with their coils are employed as the size or character of the heater may demand.

It will be understood that the radiating-surface described, instead of being dat, may be curved, round, cylindrical, or of any other convenient conformation, according to the different purposes for which the heater is to be used.

In order to regulate the amount of heat to be obtained, I combine with the heater a regulating device consisting of resistances R and a commutator, G, such as described and claimed by me in Letters Patent No. 366,034. As shown in the drawings, this commutator may consist of Wood o1' any other material adapted to turn in suitable bearings and having upon its peripheral surface metallic projections g at suitable intervals. Upon these projections are adapted to bear contact-fingers h, forming the terminals of resistance-coils or other forms of resistance, Fig. 1.

rllhe contact-finger p at one end of the com- IOC into or cut out of the short circuit around the heating-coils and the amount of current supplied to the latter correspondingly controlled.

In Fig. 2 I have shown the terminals of the series coils as connected to binding-posts b; but, il' desired, there may be combined with the rows of coils a commutator or switch, L, similarin character to the commutator G, and contact-nagels Z at the terminals of the rows of coils may be adapted to bear on the pro jections of the commutator-cylinder, so that by turning the latter more or fewer rows of coils may be included in the circuit, according to the amount of heat desired.

I claim as my inventionl. An electric heating device consisting of iire-prooi' insulating material having projections around and in contact with which heating-conductors are placed.

2. An electric heater consisting of a radiating-surface of fire-proof insulating material, having,` conical projections around and in contact with which heating-conductors are placed, and which are capable of being heated by the coils.

3. An electric heater consisting of a surface of fire-proof insulating`v material and detachable cones thereon and heating-conductors around the cones.

4. The combination of the surface of {ireproof insulating material, having,` detachable cones, with heating-conductors coiled on the latter, and metallic clamps for the terminals of the adjacent coils.

5. The combination of the electric heater, lineconductors, and a short circuit around the electric heater, with resistances and a commutator-switch in the said short circuit, as described.

6. The combination of the rows of heatingeoils and connected contact-fingers with a com mutator or switch to include more or fewer ofthe rows of coils in circuit.

In testimony whereof I have signed my name to this specification in the presence ol* two subscribing witnesses.

CARL SEILER.

vWitnesses:

HENRY HowsoN, HARRY SMITH.

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