US1021230A - Electric heater. - Google Patents

Description

H. P. BALL.

ELECTRIC HEATER.

APPLICATION FILED FEB. 16, 1910.

1,021,230. Patented Mar. 26, 1912.

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UNITED STATES PATENT OFFICE."

HENRY PRICE BALL, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOB T0 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

- i ELECTRIC HEATER.

Specification of Letters Patent. Application filed February 16, 1910. SeriaI No. 544,238.

r To all whom it may concern:

, Be. it known that I, HENRY P. BALI; a, citizen of the United States, residing at Pittsfield, in the county of Berkshire, State of Massachusetts, have invented certain new and useful Improvements in Electric Heaters, of which the following is a specification.

' This invent-ion'relates to electric heatersand the like and has for its object the provision of a device of this characterin which the heating element -or resistance conductor is held in intimate thermal relation with the body to be heated in asimple and One of the objects of provide an electric heater in which the resistance conductor is held in contact with- -the' metallic body to be heated by integral portions ofLthe body itself, so as to approach as closely as possible the actual embedding of'the conductor in the iron. r

Incarrying out my invention I form depress'ions or grooves in the metallic body to be heated and place the conductor in the grooves. -'The sides of the grooves extend above theconductor and can be bent down over the conductorto practically inclose it,

condition between the conductor and the In the accompanying drawing, in which I have shown lily-invention embodied. in con crete form forpurposes of illustration, Figure 1 is a plan view of the heating element Fig. 2 is a sectional view ofthe same mounts edso as to form a stove; andFigs 3, 4=and 5 {are detail views showing'the means for securing the conductor in place.

'Referrin Y to the "drawings, 10 represents the metallic bod --to be heated. I have shown it in the. orm of afla't disk which is adapted to form a stove. "The under side of the plate' is grooved, as shown, in the forrnof a spiral groove 11, althou h 'it is obvious .that any other suitable orm of grooving may be employed-.' This plate may have the grooves formed therein'in various. ways; for instance, the grooves may be I dropforge d into the disk or the plate may be in the form 015 a'malleable casting. The

sides 12' of. the grooves extend abovev the surface of the plate and are tapered, as

' shown. The resistanceconductor- 13 is then prlaced 'in the groove and insulated there- .om'. This insulation may be produced by winding asbestos or other insulating ma- I V n I u my invention is to ody is'ejfected.

terial around the wire, or by folding a piece of mica around the wire as shownin Fig.

5,-and placing it in the groove. When the conductor is laid in the groove and insulated from the metal, the ed es of the groove 12 are bent down over tfie conductor. This may be done in any desired manner, as, for instance, by passing it through suitable rolls. The edges are .pressed, tightly upon the conductor, so as to holdthe latter under pressure and force'it int'o intimate thermal relation with the plate. Heat is .thus conducted away "from the wire to the working surface in a very eflicient manner,'since a large portion of the conductor is in contact with the metal.- The plate is then mounted 'in a frame, as showmandthe leads brought down to the te'rminalpins15.

I have shown and described my lnvention for purposes of illustration as being con- .structed in a. specific manner, but it is obvious that my invention is not limited either to the particular form ofheater or to the construction and arrangement of parts herein shown and described, since various modifications will suggest themselves to those skilled inthe art without departing from the spirit of my invention, thescope of which is set forth in the annexed claims. What I claim as new and desire to secure by Letters Patent of the United States, is 1."The process of making electric heaters, which consists in forming a groove in a metallic body to beheated, placing a re:- slstance conductor in said groove, and

bending the metal forming the side of the groove over the conductor to hold it se curely in place.

- 2; The process of making electric heatersa which consists in forming a spiral groove ina metallic body to "be heated, placing aresistance' conductor in said groove and bend-;

ing the metal forming-the side of the groove over the conductor to hold it in place.

3. The process of making electric heaters, which consists in grooving-a metallic plate throughout one of its surfaces, placing a resistance conductor in the grooving and bending the metal over the con uctor to hold it in place.

- 4. An' electric heater comprising a grooved metallic body and a resistance conductor" in said groove and insulated therefrom, the

metal forming the groove being bent over the conductor.

5. An electric heater comprising a plate insulated therefrom, the metal forming the moved on one side and a resistance congroove being bent over the conductor. 10 (motor in said grooves and. insulated there- .In witness whereof, I have hereunto set from, the metal forming one side of the my hand this 3rd (1a,v of Feb, 1910.--

groove being bent over the conductor. I HE BY PRICE BALL. 6. An electric heater comprising a plate Witnesses: having a spiral move in one side thereof H. B. DAVERIN, a resistance con uetor in said groove and r J AB. S. SMYBER.

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