US1310994A - Electrical heating unit - Google Patents

Description

E. KUHN AND F. E. SHAILOR.

ELECTRICAL HEATING UNIT.

APPLICATION FILED SEPT. 9. 1915.

1,310,994, 4.PIIIIII'IIl July 22, 1919.

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UNITED sTATEs PATENT oEEIoE.

FRANK KUHN AND FRANK E. SHAILCR, OF DETROIT, MICHIGAN, ASSIGNORS T0 AMERICAN ELECTRICAL HEATER COMPANY, OF DETROIT, MICHIGAN, A COR- PORATION 0F MICHIGAN.

ELECTRICAL HEATING- UNIT.

Application led September 9, 1915.

To all whom t may concern.'

Be itknown that we, FRANK KUHN and FRANK E. SHAILOR, citizens of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, 'have invented certain new and useful Improvements in Electrical Heatmg Unlts, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to electrical heating units of that type in which the heat is distributed by radiation from a naked resistor. It is theobject of thel invention to employ a continuous resistor and at the same time to concentrate the radiation at a plurality of points distributed over an area. To this end the invention comprises the construction as hereinafter set forth.

ln the drawings:

Figure l is an elevation of a portion of the unit;

Fig. 2 is a longitudinal section thereof;

Fig. 3 is a perspective view of the resistor; and

Figs. 4 and 5 are perspective views of the complementary insulator members on which the resistor is mounted.

A. is a resistor of any suitable length. B B etc. are coiled portions ofthe resistor, each comprising a plurality of convolutions, preferably forming a cone. The portion' C leading from the top convolution passes downward through the center of the coil and then laterally at D to the next adjacent coil. E are insulators formed of refractory material, such as porcelain, and which have a conical portion F for receiving the conical coil. This conical portion is slitted at G on one side thereof for the insertion of the portion C of the coil, and at the base of the cone is a flange portion H which has slots l for receiving the lateral portions of the resistor. .l is an insulator ring for fitting around the cone F and against the base flange H. This ring J has aprojecting portion K of reduced diameter for fitting into an apertured holder plate L, and the member E is also provided with a portion M cf reduced diameter for fitting into an apertured holder plate hl.

With the construction as described to assemble the unit, the coils B B etc. are engaged with a series of members E, and the Specification of Letters Patent.

Patented July 22, 1919.

seria1N0.49,725. l

members J are then placed inengagement therewith, as shown in Fig. 2. The pairs of members are then placed between the parallel holder plates L and N, while the intermediate connecting portions of the resistor are housed between said plates, being spaced therefrom and out of electrical contact. lVhen the current is passed through the resistor, each of the coils will form a glowing point of radiation, and byreason of the engagement of the'members E and J displacement is prevented.

lVhat we claim as our invention is l. An electrical heating unit, comprisinga continuous resistor having a series of spaced convoluted portions and insulators formed of complementary sections engaging each of said convoluted portions directly and clamping the same in position.

f2. An electrical heating unit, comprising a continuous resistor having a series of convoluted portions, Aand insulators for supporting said convoluted portions, comprising a conical base portion and a clamping ring.

3. An electrical heating unit,` comprising a resistor having conical tions with the terminal portion extending through the axis of the convolutions, and an insulator having a portion for fitting within' said convolutions slitted minal portion.

4. An electrical heating unit, comprising a resistor having a conical convoluted ortion with a portion extending axially o the convolutions, an insulator having a conical portion for engaging said convolutedV portion slitted to receive said axial portion, and

to receive said teran insulator ring surrounding said conical' portion and clamping said resistor thereon.

5. An electrical heating unit, comprising a resistor having a convoluted portion with a terminal portion extending through the convoluted portion and spaced from the convolutions thereof, and an insulator having a portion fitting within said convolutions, slitted to receive said terminal portion.

6. An electrical heating unit, comprisinga resistorhaving a series of convoluted portions, insulators for supporting said convolated; portions, comprising a base portion tting within the coil and a clamping ring, and spaced members for holding the clamping ring upon the base portion, one of said convoluted por-` spaced members being apertured for the reception of one of the insulators.

7 An electrical heating unit, comprising a resistor having a convolutedportion with a terminal portion extending through the convoluted portion and spaced from the con- Volutions thereof, an insulator having a portion fitting Within said convolutions slitted to receive said terminal portion, an -insu- 10 lator ringsurrounding said portion tting within the convolutions and clamping said resistor thereon, and spaced members clamping said insulator parts to each other.

ln testimony whereof We aiiX our signatures in 'presence of two Witnesses. FRANK KUHN.

FRANK E. SHAILOR. Witnesses:

HARRY W. LUYGK, JAMES E. DUFFEY.

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