US1150427A - Electric iron. - Google Patents

Description

W. S. HADAWAY, JR. ELECTRIC IRON.

APPLICATION FILED SEPT. 5. 19H.

Patented l?, 1915.

2 SH SHEET In ven tor.-

/mrfoy Atty W. S. HADAWAY, 1R.

ELECTRIC IRON. APPLICATION FILED SEPT. 5. I9II.

1,150,427., Puente@ Aug. 17,1915.

2 SHEETS-SHEET 2.,

In Ventor: y

WILLIAMv S.-HADAWA Y, JR., OF YORK, N. Y.

ELECTRIC IRON.

Specification of Letters Patent.

Patented'nug-17, 1915.

Application led September 5, 1911. Serial No. 647,693.

To all whom it may concern.'

WAY, Jr., a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented new and useful Improvements in Electric Irons, of which the following'is a full, clear, concise, and exact` description, reference being had tothe accompanying drawingforming a part of this specification.

My invention relates to electric heaters.

It is particularly applicable to electric irons, but itl should be understood that it may be used vin various other relations.

One of the objects of the invention is toI provide an improvedl compact and efiicient electric heater.

Another object is to provide a heater in which the heat is directly distributed to the surface to be heated in the proportions desired and with a minimum loss by radiation.

Fig. 2 shows a top plan view of the heating elements in position in the device.v F 1g. 3-

A further object is t o provide a simple, inexpensive and rugged electric heater.

Other objects and advantages will hereinafter appear. y

The accompanying drawings illustrate an embodimenty of the invention. 4

The views of the drawing are as follows:

Figure 1, shows a central longitudinal sectional view of one form of my invention.

shows a detail perspective view of one of the heating elements. Fig. 4 shows a detail per- .spective View of another heating element.

Figs. 5 and 6 show details of construction.

I have illustrated my invention as applied to an electric laundry iron, having a bottom plate 1, upon which the heating elements 2 are carried.l A thick heat insulating pad 3, preferably of asbestos is placed over the heating elements, as shown in Fig. 1, and is clamped down upon the same by -a heavy ballast plate 4, adjustably attached to the bottom plate 1,`as b suitable screws 5, having taps 6 and 7. n inclosing casing 8, is fitted over the retaining plate-4, and is held in position by the taps on the screws 5, which also serve to hold the Shanks 9-of a suitable handle 10, in position upon the top of the casing. Suitable terminals 11, extend through 'the back of the casing 8 and are connected to the heating element 2.

In my improved construction the plate 1, which may be of any desired conformation, is preferably made of cold rolled steel,

' punched out in onev pie-ce andl drilled and Be it known that I, WILLIAM vS. HABA-- tapped at points preferably along its` center llne to receive the screws 5. By the use of a punched piece of cold rolled steel I am able to avoid the necessity for machining any of the surfaces. On opposite sides of the upper surface of this plate 1, are fixed suitable longitudinally extending channels 12. In a preferred form, I electrically weld these channels to the plate 1. In the form illustrated in Fig. 2, the channels are made from stampings of metal which are provided with i' present form, the channels are carried on the plateA 1, on opposite sides of the screws 5.

If desired, one end of the channels may be cut away, to permit the passage of the forward screw, as'shown in Flg. 2.

Within each of the channels 12, illustrated in perspective in Fig. 3, is placed a sheet of insulating material 13, conforming to the shape vof the channel. Mica forms la suitable insulating material, but other insulating materials may be used if desired. Over the sheet 13, is placed a strip of resistance material 14 which may be of the .Well-known ribbon type. Over the resistance 14, is placed a second sheet of insulationv 15, preferably of the same material as the sheet.13. Over the sheet 15, is placed a sheet of metal 16. After this sheet has been placed in position within the channel the sides ofthe channel are bent over, as shown in Fig. 3, so that the plate 16 is firmly pressed against the insulating layer 15, and the resistance material is tightly clamped in position. In the form shown, the strip of resistance material, the sheets of insulation and the upper sheet of metal are provided with rearwardly projectingextensions having perforations in their ends, adapted to receive the terminals 11. These ends are bent upward and forward, as shown in Fig. 3, so that they extend over' recesses 17, formed in the back of the plate 4. In the present/form,

tion are provided with suitable metal bushings 20, crimped to the edges of the perforations as at 21, and the terminals 11 are threaded as at 22 at extend through the perforations in the ends of the bent up extensions 23, being secured to them by a suitable tap 24, and sultably insulated where necessary by washers 25 of insulating material. If desired, the terminals 11, may insulated strip 9.5, vwhich is preferably provided with suitable per'forations in its ends, through which the terminals pass.

In the form of device illustrated, I provide the tip of the iron with a heating element of a different construction and arrangement from that just described. Said heating element is preferably inclosed within a. stamped metal casing, electrically welded to the plate 1 and having its sides 27 bent -over upon the heating element as shown in Fig. 2. In this construction, however, the heating element is substantially ytrangallar in shape, and the sides of the metallic inclosingv plate are bent over upon it entirely around its edges. As in the previous construction, I preferably place a sheet of in- -sulating material 28, such as mica, upon the bottom of they metallic casing. Over this sheet of insulation, however, instead of using the ribbon resistance I place a tape-wound unit, in which the wire is wound in substantially parallel convolutions, across the top and bottom of a substantially triangular shaped sheetof insulating material 29, such as mica, as shown in Fig. 4, the different convolutions being spaced by stepped notches 30, preferably formed on the edges of the sheet 29 which form the legs of the triangle. Over the resistance material a second sheet of insulation 31 is placed, which is preferably formed of the same material as the bottom sheet of insulation. Over this sheet of insulation a metal plate 32 is placed, and after this sheet is placed in position the sides ofthe casin -are bent down all around the unit, so that t e resistance is firmly held in. ositionl. By preference I stamp out the inc osing metal. casing near one of its edges and at the backfasshown at 33, in Fig. 2, so that when the sides of the same are presseddown, an opening is left through which the ends of the resistance wire may pass, so that it may be connected, as by spottheir inner ends.. andl be connected by a suitably` welding, to the ribbon resistance carried on the body portion of the iron.

In the present form, the asbestos. pad 3, 1s

providedwith a flange 34, on its lower surface which extends entirely around the units and fits around the edges of the. resistance units, so that when said pad is-forced down upon the resistance units, these units are practically hermetically sealed between the same and the plate 1. I find that this heat insulating pad may be made of a moderately dense grade of asbestos mill board. Il owever, other materials may be used, if desired. The main function of the pad is to minimize upward radiation of heat to the ballast plate 1 whereby most of the heat developed is conducted readily through the steel plate "on shoe 1 to the working surface. The ballast plateis not primarily a heat storage plate, but is used more ,to lend the necessary weight to the device. In fact,I said ballast plate, which is made preferably of cast iron, is not as good a conductor of heat as the steel shoe, and hence the latter absorbs the heat more rapidly than the former. For 'this reason, the heat is conducted rapidly to the surface where it is needed, as fast as it is generated, and a heat storage plate is notneeded. The use of a steel heating plate having the heating units'integrally united theretoresults, therefore, not only in a more simplified structure mechanically, but in one having greater efficiency from a thermal standpoint. By the use of the heat insulating pad above described I am able to take up a l the irregularities of the surface of the resistance units and form a casing which fits tightly over the surface of these units. In the form illustrated, slots 35 are cut in the back of this sheet to permit lthe extensions 23 on the ribbon units to pass through the same. v

The ballast or storage Aplate 4, lmay be formed of a rough casting Without any 'maf' chinery whatsoever, since any irregularities in the surface of the plate are takenlup by the insulating sheet 3. Thus it will be seen that a direct union is made between the heating units and the plate 4 by means of the insulating plate 3, and that any irregularities on the surfaces of either the units or the plate 4 may be overcome and in fact, turned to advantage by promoting a better union between the parts. The plate 4 is here shown as provided with recesses 3G, on its upper sur ace to receive the screws 5, and it is also provided with the recesses 17, at its back, heretofore mentioned. The recesses 17 are spaced by a septum 37, and the plate 4 is made slightly shorter than the plate 3, so that the extensions 23 on the ends of the ribbon units may pass up through the slots in the sheet 3, and be bent around the end of the plate 4, as shown in Fig. 1.

The casing8, illustrated in section in Fig.

1, may be formed of any vsuitable thin -material. By preference, it is formed or drawn from a thin sheet of cold rolled steel, and is so constructed that-it incloses the plate 4 A and the inner ends of the terminals 11. As

illustrated in Fig. 1, this casing 8 rests upon the upper surface ofthe outer edge of the insulating sheet 3, so that it is insulated from the heating plate 4. This casing is spaced from the Shanks of the handle 10 by suitable washers38, which are preferably of an insulating material, so that the handle is insulated from the casing.

It is of courseobvious that when it is desired to use the heating device all that it is necessary to do is to connect a terminal plug to the terminals 1I. The circuit then extends .from one ofthese terminals through one of the ribbon' resistance elements, through the. tape resistance at the tip, and back through the other ribbon'resistance to the other terminal.- By my improved arrangement ofresistance units and the employment of the two types of resistances in combination, I amable to properly dis' tribute the energy input for the different parts of the iron in accordance with the area to be heated, and thereby secure uniformity of temperature. Further, by the use of the electrically-Welded metallic casings or channelsl for the resistance units I am able to secure a very compact heater. Further, I am able to use a face plate of cold punched steel without the necessity of machining the surfaces of this plate and am thus able to cut down the cost of the manufacture. Further, I am able to use a rough iron casting, ifdesired, for the upper or ballast plate, and am able to do away with the necessity for machining the surfaces of this plate, the union between the parts being elfectually made by the insulating sheet, which serves to equalize the pressure between the parts and at the same time serves to prevent the heat from being rapidly conducted upward away .from the bottom plate. Further, by the use of the inclosing casing or shell -I am able to inclose the parts in a suitableA casing which rests upon the insulating plate and is thus insulated from the bottom or heating plate, so .that the heat is not conveyed to the shell in such a manner as to be objectionable. By the'use of the terminal bushings I am able to provide a dust-tight casing for the terminals. Further, by the use of the extensions on the resistance units, I am able to provide a stable support for the terminals.

VVhileI have in this application, for the purposes of illustration, described one specific form which my invention may assume in practice, my invention may assume other forms and I consequently do not wish to be limited to the specific-form herein described,

bottom plate, a flexible strip which fall Awithin the scope Aofthe appended clalms.

What I claim as new and desire to secure by Letters Patent is as follows 1. In combination, an iron having a bottom plate, a flexible strip integrally, united with saidY plate, a heating element held by s aid strip in intimate heat conducting relation with said plate, and means for confining to said -plate the heat generated by said element.

2. In combination, an iron having a bottom plate of good heat conducting material, a -liexible strip integrally united -with said plate, a heating element held by said strip in intimate heat conducting relation with said' plate, a heat insulating member covering said element to cut oil' the radiation of heat therefrom and a ballast plate to lend weight to said iron.

3. In combination, an iron having a steel integrally united with said plate, a heating element held by said strip in intimate heat conducting relation with said plate, a heat insulating member for confining to said plate the heat generated by said element, and means holding said member in intimate mechanical contact with the upper surface of said heating element. v

4. In combination, an iron having a bo`ttom plate, flexible strips integrally united with said plate and extendingsubstantially around the edge of said plate, and a heating element held by said strips in intimate heat conducting relation with said plate.

5..In combination, an iron having a bottom plate, flexible strips extending along the edges yof said plate, said strips being integrally united with said plate, intermediate 10.5 strips integrally united with said plate, and means for heating said iron secured to and held in intimate heat conducting relation with said plate by said strips.

6. In combination, an iron having a bot- 11 tom plate, flexible strips integrally united with said plate and extending from the rear thereof to the point and disposed adjacent to the edge thereof, flexible strips integrally united with said plate and located intermediatesaid strips, and means for heating said iron secured to said bottom plate by said strips.

7. In combination, an iron having a bottom plate, a plurality of substantially longitudinally disposed flexible strips integrally united with said plate, a plurality of triangularly arranged flexible strips integrally united'with said plate and carried upon the end thereof, and means for heating said 1.25 plate' secured thereto by said flexible strips.

8. In combination, an iron having a bottom plate, a plurality of flexible strips integrally united with said plate and extending around the edge thereof, a plurality of i Corrections .in Letters Patent No. 11,1 50,427.

flexible strips integrally united with said iron and intermediate said first mentioned strips, a flexible strip integrally united with said plate and extending transversely thereof, and means for heating said iron secured to and held in intimate heat conducting relation with said plate by said strips.

9. In combination, an iron having a bottoni plate, a plurality of flexible strips integrally united therewith, a plurality of heating elements secured to said plate and held in intimate heat conducting relation therewith by said strips, a heat insulating gasket resting upon said heating elements, a ballast plate resting upon said gasket, and compressing the same upon said heating elements, and a casing inclosing said ballast plate and insulated from said bottom plate by said gasket.

10. In combination, an iron having a bottom plate, a plurality of flexible strips integrally united therewith, a heating element secured to said bottom plate by said ductile strips, said ductile strips having integral extensions, and terminal members secured to said extensions.

11. In combination, an iron having a bottom plate, a plurality ot' flexible strips integrally unitedwith said plate, a heating element for said iron secured to said plate bv said flexible strips, said heating element and said ductile strips said extensions.

12. In cpmbination, an iron having a bottom plate, a plurality of flexible strips integrally united therewith, a heating element held in intimate heat conducting relation 1915, vupon the application of an improvement in merel); same page, Patent should tothe record of the Signed and sealed this temi the thermal eliciency of the union having integral ex. tensions, and terminal members secured to.

Electric Irons, errorsA requiring correction les follows: Page 2, line 68, after the reference-numeral 3 page 4, line 15, claim 9, after the word line 32, for the word ductile read jerct'ble; and

with said plate by means of said strips. a ballast plate located above said heating element, terminal-carrying extensions integrally united with said lexible strips and overlying the end of said ballast plate, a casing inclosing said ballast plate and said extensions, and terminal posts secured to said extensions and extending through openings in said casing.

13. An electric iron having a shoe made of steel of substantial thickness whereby said shoe isrigid and capable of distributing heat over its acting surface, a flexible sheet metal carrier welded directly to said shoe whereby between the carrier and the shoe is not impaired by expansion and contraction, a. resistor arranged within said carrier and insulated therefrom, said carrier having flanges bent over said resistor for holding it in close thermal relation with said shoe.

l-i'. In an electric iroii, a metal shoe `of good heat conductivity, an electric heater on the upper surface thereof, secured thereto in intimate heat conducting relation therewith, and a ballast plate above said heater', of less heat conductivity than said shoe, whereby the heat is conducted directly through said shoe to the work without being stored in said ballast plate to any substantial degree.

In witness uiher'eof, I have hereunto subscribed niy name in the presence ot' two witnesses.

WILLIAM S. HADAVVAY, J ii. Witnesses A. B. I-IUnnnLL, EDwiN N. Lrcirrroo'r.

It is herebycertied that in Letters Patent No. 1,150,427, granted August 17, William S. Hadaway,'Jr., of New York, N; Y., for

appear' in the' printed specification strikeoutthe comme; page 3, line 49, for the reference-numeral"4 read 1, (nugesket strike out the comma;

that the said Letters I be read with these corrections therein that the same may conform case in the Patent Ollice.

7th day of September, A. D., 1915.

J. T. NEWTON,

Acting Commissioner of Patents.

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