US469792A - Electrically-heated smoothing-iron - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1.

W. MITCHELL. ELEGTRIGALLY HEATED SMOOTHING IRON.

No. 469,792. Patented Mar. 1,1892.

INVENTOR WW w WiTNESSES (No Model.) 2 Sheets-Sheet 2.

W. MITCHELL.

ELEGTRIGALLY HEATED SMOOTHING IRON.

No. 469,792. Patented Mar. 1, 1892.

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WVILLIS MITCHELL, OF MALDEN, ASSIGNOR TO THE BUTTERFIELD-MITCIIELL ELECTRIC HEATING COMPANY, OF BOSTON, MASSACHUSETTS.

ELECTRICALLY-HEATED SMOOTHING-IRON.

SPECIFICATION forming part of Letters Patent No. 469,792, dated March 1, 1892.

Application filed May 27, 1891.

To all whom it may concern:

Be it known that I, WILLIS MITCHELL, a citizen of the United States, residing at Malden, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Electrically-I-Ieated Smoothing-Irons; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has for its object to improve tailors irons and other smoothing devices which are heated by electricity. Heretofore a wire forming part of an electric circuit has frequently been employed for such purposes, the said wire being wound ona core in successive coils which are suitably insulated by interposed sheets or cylinders of asbestus or by other means. By experiment I find that the best results are attained when the cores of the heating-coils or helices thus wound are integral with the metal body of the iron or other smoothing device or attached thereto at one pole. I therefore form the body or bottom plate of the tailors iron or other smoothing device with integral magnetic studs on which the coils or helices of wire constituting the heating devices are wound, as above stated.

In the accompanying drawings, Figure 1 represents a side elevation of an electricallyheated tailors smoothing-iron embodying my invention, the handle being partly broken away to show the passage of the insulated wire. Fig. 2 represents a perspective view of the metallic body or bottom plate of the heater, showing the studs or posts raised thereon. Fig. 3 represents a similar view showing the heating devices and bridges in position. Fig. 4: represents in vertical section one of the heating devices consisting of the coiled wire, the interposed layers of asbestus, and the stud or post forming their metallic core; and Fig. 5 represents a longitudinal vertical section of the tailors iron without the heating devices.

In the said drawings, A designates the ordinary wooden grasping-piece of the handle of a tailors smoothing-iron, the metallic frame of said handle consisting of two counterpart supporting-bars B B, in the upper ends of which the said grasping-piece is journalcd by greatest heat.

Serial No. 394,284. (No model.)

gudgeons b. To allow this j ournalin g the said bars curve outward and upward divergent-1y from near the middle. Below this they are vertical and parallel for a short distance, their 5 5 inner faces being shaped to form a guide-passage for insulating-cords c 0 containing the two ends of the wire C, which enter the hollow tailors iron through an opening in the middle of its top plate D, side by side.

The lower ends of bars B B are provided with horizontal reversely-extending feet 12 which are fastened to the body of the iron by screws 0 or in any other convenient manner.

The iron is hollow, and consists of a solid metallic body or bottom plate E, and the aforesaid top plate with interposed side walls F of asbestos. These walls greatly lessen the weight of the implement without impairing its efficiency for ironing; but they are not absolutely necessary, as the sides of the body E may be extended up to the said top plate; but when the asbestus walls F are used, as shown, these sides are extended up only a little way, forming a peripheral rim f, which afiords a base for the said asbestus walls. The metallic body thus constructed is, in effect, a bottom plate with a thick raised rim, and a number of posts or studs in the space which that rim incloses. These studs or posts are raised on the flat upper face of the said body or bottom plate, and are preferably cast therewith. Like said body, they are of magnetic metal. Two of these posts (marked G) are centrally screw-tapped on top to receive the screws 6 hereinbefore referred to, but have no other use. The other posts II are also screw-tapped to receive screws h, whereby bridges I are fastened to them. Eachone of these cores or posts H is surrounded by a cyo lindrical heating device consisting of a part of the wire 0, wound in successive concentric helices with interposed cylinders of asbcstus J, the wire being preferably naked and wound at such intervals as I have found to give the 5 The Wire is wound first 011 the core upward, then downward on the first asbestus cylinder, then upward on the next, and thus end for end until a sufficient'number of coils have been provided. The wire then passes to the next post or core H, and this is wound in like manner, the winding continuing post after post until each core is properly equipped for heating. The bridges I, which may be of any suitable form or numher or even united in a single plate, serve to keep the heating-coils and asbestus cylinders in place.

hen a current of electricityis sent through the wire, the cores H are heated as usual, and also magnetized, and as the magnetization extends more or less to the bodyE a certain amount of heat is generated in the latter by electrical currents or molecular motions induced thereby in addition to the heat generated by resistance of the wire and conducted by the metallic cores into the said body. Thus the electric current is made to produce heat in at least two ways, and, as a result, the smootlringiron is very efficient with but a comparatively slight expenditure of generative power.

Although thisimprovementis shown herein as applied to tailors irons, it is equally applicable to ordinary flat-irons and other forms of smoothing devices.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

1. 'In anelectrically-heated smoothing device, a body of magnetic metal aflt'ording the heating and smoothing surface and provided with magnetic studs or cores, in combination with wire coiled about said studs and forming part of an electric circuit.

2. In an electrically-heated smoothing device, a magnetic metal body affording the smoothing-surface and having studs integral therewith, in combination with metallic conductors surrounding the said studs, substantially as and for the purpose set forth.

3. A hollow smoothing-iron having studs G and H raised from its bottom, in combination with a handle which is fastened by screws to studs G, and electric-heating devices surrounding studs H, substantially as set forth.

4. A hollow smoothing-iron consisting of a top plate, a bottom plate or body, and side walls entirely of asbestus, and provided with a handle and internal electric heating device, a plate or body provided with studs or posts, in combination with electric conducting material surrounding the said posts as cores, and bridges fastened to the said posts for holding the said conducting material in its place, substantially as set forth.

7. In an electrically-heated smoothing device, a magnetic plate having studs formed thereon to serve as cores for wire wound in coils or helices, substantially as set forth.

In testimony whereof I affi'x my signature in presence of two witnesses.

WILLIS MITCHELL. Witnesses:

W. PIERCE, W. P. JOHNSON.

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