US1472762A - Electric iron - Google Patents

Description

Oct. 30, 1923. 1,472,762 Y. MOORE Filed Sept. 26. 1921 2 Sheets-Sheet 1 Oct. 30 1923. 1,472,762

Y. MOORE ELECTRIC IRON Filed Sept. 20. 1921 2 Sheets-Sheet. 2

7 15 J3 T 13 41 1 #2 -1 N8 30 40 31 Fig. 7

Patented Oct. 30, 1923.

UNITED STATES PATENT OFFICE.

YOUNG MOORE, OF INDIANAPOLIS, INDIANA, ASSIGNOR, BY MFSNE ASSIGNMENTS, TO LIBERTY ELECTRIC COMPANY, A CORPORATION OF INDIANA.

ELECTRIC IRON.

Application filed September 20, 1921. Serial No. 502,081.

T 0 all "whom it may conceqm Be it known that I, YOUNG Moons, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented a new and useful Electric Iron, of which the following is a specification.

It is the. object of m invention to simplify and make more e ective the construction of elect 'c irons; to provide an iron in which the heating element maybe made ofpre-formed helical coils of wire of great lengthand large cross-section, so that cheaper grades of wire having lower resistance per unit of length can be used, and the wire can be worked at a lower temperature than is the common practice; to provide a wire-carrier in which the p -f0nned coil may be laid in serpentine grodi es, with the pitch ofithe helix different in different parts of the carrier as desired to obtain the proper distribution of heat; to make such wire carrier of molded insulation; to provide a complete iron structure the parts of which are held together'by the same screw or screws, the removal of which allows the dismantling of the whole structure; and to make the base of the iron project laterally beyond the covering shell, and effectively heat such projecting base, so that ruffles and plaits may be effectively pressed.

The accompanying drawings illustrate my invention: Fig. 1 is a perspective View of a complete iron embodying my invention; Fig. 2 is a longitudinal section through such iron, substantially on the line 2--2 of Fi 4; Fig. 3 is a transverse section substantial y on the line 3-3 of Fig. 2; Fig. 4 is a bottom view of the molded block or wirecarrier; Fig. 5 is a bottom view of the winding which is carried by such block, showing the different spacings vof the turns of the winding at difl'erent parts of the iron; Fig. 6 is a longitudinal section similar to Fig. 2, showing a modified construction, especlall adapted for the larger sizes of irons;'Fig. is a section on the line 7-7 of 6; and Fi 8 is a perspective view, on a'smaller sea e, of the cover-block of imulatlng material in ,the modified form siown in Figs. 6 and 7.

The iron has a base plate I), which projects laterally at all lnyond the remainder of the iron, to hm an extension '11, which is particularly an IOI'JIOIllIlg plaits and I'uflles' and "for getting into corners. The base 10 has one or more upwardly projecting lugs 12, two being shown,

which are providedat their upper ends with threaded holes for receiving two screws 13. by hwhich the whole iron is clamped toget er.

f A molded block 15, of insulating material, rests on the base 10, bein provided with holes 16 through which t e lugs 12 extend; The under face of this molded block 15 is provided with an open serpentine groove 17, which winds and weaves back and forth, preferably in a general longitudinal direction, and which has a portion 17' lying right in ,the point of the block 15. The groove 17 has no sharp bends, but its parts are wholly connected b curves, and it covers substantially the who e of the under face of the block15. The two ends of the continuous serpentine groove 17 lead into two recesses 18, at the rear of the block 15, in which recessesare located the binding nuts 19 of terminal pins 20 which are mounted in the rear end of the block 15 and project obliquely rearwardly upwardly therefrom. These terminal pins are ordinary terminal pins upon which an ordinary heater connector may be pushed to connect the iron or from which said connector may be pulled to disconnect the iron. The outer clamping nuts 21 of the terminal pins 20 are seated in recesses in a boss 22 provided at the rear upper corner of the molded block 15. The block 15 is preferably made of porcelain formed of flint clay and feldspar as'the base thereof.

A 'continuous helical coil 25 of wire is laid free in theserpentine groove 17, and has'its 'two ends connected to the two terminal' pins 20 within the recesses 18. This helical coil is pre-formed, so that it may be wound very rapidly on standard coil-forming machines, and cut into the pro 1' length; and is of proper diameter so t at when it'is, laid in the groove 18 it does not project beyond the under surface of the molded insulating block 15. The wire used for the coil 25 is of suitable resistance material, but the cheaper resistance material may be used, because by the use of this continuous helical coil 0. great length of wire all the other forms of heating units. The wire of the coil 25 may be here wire, as'I have found that even thou h adjacent turns of the coil touch one anot er there is no short-circuiting of coils because the oxidation on the surface of the wire is suflicient insulation to take care of the low voltage between adjacent turns under any slight contact pressure which may exist between them. The helical coil 25 is continuous through the whole length of the serpentine groove 17, the curves of such ooves permitting this,

but the spacing of t e turns of the coil may be more dense at some places than at others, as at the point of the iron, and to a somewhat less extent along the outer edges of the molded block 15, to produce a reater' heating effect at such point and e ges to take care of heating the extension 11 of the base plate 10. This spacing of'the coils may be easily obtained in laying the coils in the groove 17.

When the helical coil 25 has been laid in the groove 17 and connected to the terminal pins 20, the block 15 with such coil is placed over the lugs 12, so that its under coil-containing face lies close against the upper surface of the base 10. If desired, a thin sheet 26 of mica or other sheet insulation may be interposed between the block 15 and the base 10, but such sheet may be omitted if desired. Then an enclosing shell 27 is placed over the block 15, such shell conveniently bein formed of a onepiece metal stampin whichas holes to permit the assage theret rough of the screws 13 and a arge hole at the rear to permit the passage therethrough of the boss 22. The shell 27 rojects downward around the outer edge oi the block 15, into close proximity to the extension 11 of the base 10, preferably over a shoulder 28 which may be provided near the edge of such base to assist in centering and holding the shell, and lessening the strain on the screws 13 and lugs 12, though such shell does not necessarily touch such base; but the extension 11 of the base projects laterally a considerable distance beyond the outer face of the shell 27, as is clear from all the figures.

A handlesupporting clip 30, of general U-shape, with a wooden handle 31 mounted between its up-turned ends, is clamped upon the top of the shell 27 by the screws 13. Suitable heat-insulating washers 32 may be interposed between the clip 30 and the shell 27, and other yielding heat-insulatin washers 33 may be interposed between t e shell 27 and the bosses 12 and the molded block 15, so that when the screws 13 are tightened arts are clamped firmly together, with suc ielding of the washers'33 as'may be require and yet the shell 27 and handle supportin clip 30 are not in heat-conducting contact with the lugs 12 of the base 10, and the heating of such shell and clip will be greatly reduced, and in addition the possi bility of breakage of the block 15 is lessened by the cushioning effect of the washers 33.

By removing the screws 13, the whole iron may be dismantled, by simply lifting apart the several elements thereof; so that access is readily obtained to all the parts for inspection and repair. By reversing the operation, the iron is easily assembled.

In order further to keep the shell 27 and clip 30 cool, I may use the construction shown in Figs. 6, 7, and 8. Here I interpose between the molded block 15 and the shell 27 a second molded block 40, which rests upon the block 15 upon which in turn the shell 27 rests. As before, the parts are all clamped together by the same clamping screw or screws 13. The two molded blocks 15 and 40 need not bear upon each other throughout their whole adJacent surfaces, but may be spaced apart at certain points, as at bosses 41 around the lugs 12. The second molded block 40 is hollow on its under side, so that it fits over and extends down around the molded block 15, with air spaces between. so that additional heat insulation is provided for the shell 27.. The rear end of the second molded block 40 is cut away to allow the projection of the boss 22 in which the terminal pins 20 are mount 'ed. The shell 27 is preferably spaced from the block 40, as it is from the block 15 in the arrangement shown in Figs. 2 and 3 inelusive, by the yielding washers 33.

It will be seen that by placing the wire in the groove in the manner described unobstructed expansion and contraction of the wire is permitted so that the danger of the wire breaking us is frequently the case when the wire is embedded in the insulating material is prevented.

I claim as my invention:

1. An electric iron, comprising a plate, 'a molded block of insulating material resting upon Sllth plate, said molded block having a continuous serpentine groove in its under face, said serpentine groove being composed of parts extending generally lengthwise of the 1ron,'a continuous helical coil of wire laid free in such serpentine oove, an open-bottom metal shell enclosing. such molded block. and clamping means for clamping said shell to said base with the molded block between them.

2. An electric iron, comprising a base plate, a molded block of insulati material resting upon such plate, said mo ded block having a continuous serpentine groove in its under face, a continuous helical coil of wire laid free in such serpentine groove, an openbottom metal shell enclosing such molded block. and clam ing means for clamping said shell to said ase with the molded block between them.

' such plate, said molded block 3. An electric iron, comprising a base plate, a molded block of insulatin material resting upon such plate, said mo ded block having a continuous serpentine groove in its under face, a continuous helical coil of wire laid free in such 'serpentine groove, terminal pins mounted in said molded block and connected to theends of said coil, an open-bottom metal shell enclosing such molded block, said shell being provided with an opening for such terminal pins, and clamping means for clamping said shell to said base with the molded block between them.

4. An electric iron, comp-rising a base having one or more upwardly projecting lugs,'a molded block of insulatin material resting upon'said base and provi ed with a hole or holes through which said lugs extend, said molded block having an open groove in its under face, a helical coil of wire laid free in such groove, a handle and a support therefor, and clamping screws passing through said support into said lugs for clamping said support and base together with the molded block between them.

5. An electric iron, comprising a base having one or more upwardly pro ectin lugs, a molded block of insulatin materia restin upon said base and provided with a hole or lioles through which said lugs extend, said molded block having an open groove in its under face, a'helical coil of wire laid free in such groove, :1 metal shell surmounting said molded block and extendin downward around the edge thereof, a handle and a support therefor, and clamping screws passing through said support into said lugs for clamping said support and base to ether with the molded block and said meta shell between them.

6. An electric iron, com rising a base plate, a molded block of insu ating material of suitable dielectric strength resting upon having a serpentine groove in its under face, a continuous helical coil of wire laid free in such serpentine groove, an open-bottom metal shell enclosing such mo ded block, and clamping means for clampin said shell to said base with the molded b ock between them, the turns of said coil being more thickly spaced near the edge of said block than near the middle thereof.

7. An electric iron, plate, a molded blockof resting upon such plate, said molded block havin a serpentine groove in its under face, a contlnuous helical coil of wire laid free in such serpentine groove, an open-bottom metal shell enclosing such molded block, and clamping means for clampin said shell to said base with the molded lock between them, said base and said molded block being pointed and the turns of said coil being comprising a base insulating material more thickly spaced in said groove near said point than at other places.

8. An electric iron, comprising a base plate, a molded block of insulating material resting upon such plate, said molde'l block having a serpentine groove in its under face, a continuous helical coil of wire laid free in such serpentine groove, an, open-bottom metel shell enclosing such molded block, and clamping means for clamping said shell to said base with the molded block between them, said base and said block being pointed, and said serpentine groove winding close to the point of said molded block.

9. An electric iron, comprising a base, a

'molded porcelain block upon said base, said block having a groove in its under face, a helical coil of wire laid free in said groove, a protecting shell, a handle and its supporting clip, and means common to all of said parts for fastening the same together.

10. An electric iron, comprising a base, a molded block of insulating material thereupon, said molded block being provided with an open groove in its under face, a helical coil of wire laid free in said groove, a second molded block restin upon the first block, an enclosing metal she I overlying said second molded block and projecting down around the edges of said two blocks, a handle and its supporting clip, and means for clampin said handle to said base late with said she I and two molded blocks etween them.

11. An electric iron, comprising a base, a molded block of insulating material thereupon, said molded block being provided with an open groove in its under face, a helical coil of wire laid free in said groove, :1. second molded block resting upon the first block, said second molded block being hollow on its under face so that its edges project down around the first molded block, an enclosin metal shell overlying said second molded block and projecting down around the edges of said two blocks, and means for clamping said shell to said base plate with two molded blocks between them.

12. An electric iron, com rising a base plate, a molded block of insu atin material resting upon such plate, said mo ded block havin a serpentine groove in its under face, a continuous helical coil of wire laid free in such serpentine roove, an open-bottom metal shell enclosing such molded block, a handle and its supporting clip, and clamping means for clamping said clip to said base with the shell and the molded block between them.

13; An electric iron, comprisin a base, a molded porcelain block upon sai base, said block having a continuous groove in its under face, a continuous helical coil of wire laid free in said groove, a rotecting shell, and means for fastening al said parts together.

III

Ill

14. An electric iron, comprising a base, a molded block of insulatin material thereupon, said molded block being provided with an open roove in its under face, a helical coil of wire laid free in said groove, a second molded block resting upon the first block, an enclosing metal shell overlying said second molded block and pro'ecting down around the edges of said two blocks, and means for clamping said shell to said base plate with two molded blocks between them.

15. An electric iron, comprising a base plate, a molded block of insu ating material resting upon such plate, said molded block having a serpentine groove in its under face, a continuous coil of wire laid free in such serpentine groove, an open-bottom metal shell enclosing such molded block, and clamping means for clampin said shell to said base with the molded ilock between them, said last plate having a shoulder near its edge on its upper face over which shoulder the edge of said shell extends.

In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this 10th day of September, A. D. one thousand nine hundred and twenty-one.

YOUNG MOORE.

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