US1552813A - Electric household iron - Google Patents

Description

Sept. 8, 1925. 1,552,813

G. AMMAN ELECTRIC HOUSEHOLD IRON Filed Jan, 12, 1923 jg: A\\\\\\\\\\\\\\\\\\\\\\\\\2E LE 7? a ATTORNEYS.

Patented Sept. 8, 1925.

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unaware nousnnonn more Application filed January 12,1923. Serial No. 612,261.

To all whom it may concern Be it known that I, Gnonsn AMMAN, a citizenof the United States, and a resident of Cincinnati, in the county ofHamilton.

and State of Ohio, have invented certain new and useful Improvements in Electric Household Irons, of which the following is a full, clear, and exact description, reference being h'adto'the accompanying draw- ""ings, forming part of this specification.

The object of my invention is to provide a sad iron, in. which the heating element shall comprise a cast iron top with ah-igh grade resistance wire of the kind usually employed and'spun and coiled in close for-' mation which shall be permanently embedded in a special insulating material composed of carborundum and potters clay cain its course all parts of the bottom surface of theplate.

The material and method of forming this bed plate is of great importance in the construction of the sad iron to prevent blowing out or burning out of the coil and .to prolong the duration and life of the iron.

The bed plate is .com osed of about 40% of pulverized carborun umand 60% of fine potters clay. The clay composition is dampened and molded into the proper shape with the serpentine groove in the base and the coiled resistance wire is then located in place .with the material folded over the wire suflipable of being hardened and toughened so'as to be practically imperishable and to. form a most perfect bed for the coiled heating wire and in which the metal base is so formed and grooved that the heat generated by the resistance wire shall conduct and distribute the heat uniformly throughout the base. All of which together with other novel features of my invent-ion willbe hereinafter more particularly pointed out and claimed.

In the drawings: Figure 1 is a central longitudinal section of my improved sad iron.

Figure 2- is a bottom plan view of the.

molded clay-bed with the resistance wire in place. I Figure 3 is a similar top plan view of the cast metal top. I

The heating element for the sad iron comprises a cast iron top 1 and a molded clay bed 2. The rear portion of the top is cut away and in this cutaway portion is seated a block of insulating material 8., preferably soap-stone on which are seated the terminal ciently to hold it in place. p x Y The late with the Wllieln place is then baked, or several hours in an oven at, a low heat to thoroughly dry the cla composition and prevent it from shrin 'ng. The

plate is then placed in a fire clay covered retort surrounded with sand and heated to a very high temperature for from 24: to 28 hours. The temperature is then slowly reduced and the platei allowed to cool very slowly, about twice as much time being required to cool as to heat. This strengthens posts 3 and 4, each riveted or secured to'a short metal plate 5=secured to the insulator by screw bolts 6. Passageways 7 are also formed in this block-for the ends 9 of the ,bolts for connection with the terminal posts .3 and 4. u

high resistance wirewith which the. said iron is heated, the ends'being secured to the rear bolt of each terminal.

.The resistance wire 10 is'coiled in a fine coil in the usual way and embedded in the- ,bed plate 2- in'a windin serpentine groove -imtherbase of the bed p ate 'so as to include and toughens the material and reduces. the liability of breakage to a minimum.

The top plate 1 and the bed plate 2 thus prepared are then seated on the metal base plate 12 Of,th6'S8.d iron, a layer of perforated mica 14, being preferably laid between A. metal casing 15 is then employed to cover the heating unit and the handle 16'is located; in place and all the parts secured together by the bolts 17, '17, which pass down through erforations in all the members and into t e-base plate."

The handle is also preferably-- provided ions .plate and an intermediate plate of clay meterial with a finely coiled high resistance Wire embedded therein flush with. and exposed through the lower surface with the clay material dried and baked to form a permanent holder for the resistance wire.

2. In an electric sad iron, a heating unit comprising a metal top plate, a metal base plate and an intermediate plate of clay material composed of potters clay and carborundum with a finely coiled high resistance wire embedded therein flush with and exposed through the lower surface with the clay material dried and baked to form a permanent holder for the resistance wire.

3. In an electric sad iron, a heating unit comprising a metal top plate, a metal base plate and an intermediate plate of clay material composed of a mixture of about forty percent .carborundum and sixty percent of potters clay, with a finely coiled high re sistance Wire embedded therein flush with the lower surface with the clay material dried and baked to form a permanent holder for the resistance wire.

4:. In an electric sad iron, a heatin' unit comprising a metal top plate,'a meta base plate and an intermediate plate of clay material composed mainly of potters clay with smaller amounts of earborundum baked at a high heat and slowly cooled, with a finely coiled high resistance wire embedded therein flush with and exposed through the lower surface and forming a permanent holder for the resistance wire.

5. In an electric sad iron, a heating unit comprising a metal to plate, a metal base plate and an intermediate plate of clay material composed of a mixture of about forty percent carborundum andisixty percent of potters clay, baked at a high heat and slowly cooled, with a finely coiled high resistance wire embedded therein flush with and exposed through the lower surface forming a permanent holder for the resistance wire.

6. In an electric sad iron, :1 base plate and a heating unit'seated thereon, the heating unit having secured to its under surface a finely coiled high resistance wire; with the base plate grooved on its inner surface longitudinally and transversely to distribute the heat generated by the heating unit uniformly throughout the plate with mica insulation interposed between the heating unit and the base plate.

GEORGE AMMAN.

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