US1524917A - Electric pressing iron - Google Patents

Description

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Feb. 3, 1925. 1,524,917 s. DEsURE ELECTRIC PRESSING IRON Filed Sept. e. 1924 2 sheets-sheet 1` i 1N VEN TOR- li'qgb,v 3. 1925. 1,524,917

S. DESURE ELECTRIC PREssING IRON Filed Sept. 8. 1924 '2 Shouts-Sheet 2 INVENTOR fav ATTORNEY-S lPatented Feb.v 3, 1925.

UNITED STATES SAMUEL DEsURE, or NEW YORK, N. Y.

ELECTRIC REssrNe IRON.

Application ined september ,8, 1924. seriai No. 736,405.

T o all iohoin it may concern Be it known that I, SAMUEL DEsUIiE, a citizen of the United States, residing at New Yorkcity, in the coun-ty of New York and State of New York, have invented certain new and useful Improvements in Electric Pressing Irons, of which the following is a specification. My invention relates to a new and improved electric ressing iron.

One of the o jects of my invention is to provide an improved electric iron in which the heating element forms a separate unit so that it canbe conveniently manufactured, and assembled with the other parts` of the iron. Another part of my invention is to provide a heating element comprising a plurality of separate heating coils, preferably not less than three which can be separately or simultaneously connected to a. source of electric current, or connected in a large number of combinations, so that a suflicient num# ber of variations of heat and working temperature can be secured.

Another object of my invention isto provide a heating element which extends over the entire iron, and has a lurality of separate heating coils, preferably not less than three, each coil occupying substantially the entire area of the element, so that the heating effect always extends over the entire area of the iron.

Another object of my invention is to provide a heating element having a series of coils so arranged that the maximum work- 'ing temperature. is never in excess of the temperature at which the wire of said coils remains substantially unaffected by the heat.

Another object of niy invention is to provide a new and improved combination heating element and entering plug members, which can be nia-de and handled as a unit.

Another object of my invention is to provide the handle of the :ironv with a plug device having entered plug members which cooperate with said entering plug members,

, so that the iron is made with a minimum number of parts, and no essential working partsare exposed.

Another ob]ect of my invention is to provide thehandle of the iron witha plural-Y plug vlOther objects of my invention will be set forth 1n following description and draw-. ings, which illustrate a preferred embodiment thereof, it being understood that the Aprevio-us statement of the general objects of my invention is madev as ageneral explanation, and not as a. limitation thereof.

Fig. l is an elevation. Fig. 2 is an end view. 3 is a top view. Fig. 4.- is a sectional View showing' one ofthe handle switches and the connections thereof, the .handle being shown as raised from lits normal position.

Fig. 5 is a detail view partially in sec-y i tion, showing the handle switches and the construction. l

Fig. 6 is a top view of fthe heater clement.

Fig. is a vertical central sectional View of the heater element.

Fig. 8 is a detail sectional View of the handle switch terminals. IIt is made on line 8-'8 of Fig. 5. l.

Figs. 9 and 10 are diagrammatic views of the three heater coils sh'own in this embodiment.

bottom or pressing plate 1, which has bolts l5 and 16 secured thereto. The heating element, which will be later more fully described, includes coils of wire having upstanding terminal plug members, 19, 20. 52 and 53 shown in Fig. 6, and it is held between pressing pla-te 1 and a holding plate As shown in Figs. 1-3, the iron has av 3, which is provided with four holes at the front thereof, to permit the passageof said plug members 19, 20, 52 and 53. The holding plate 3 has. two additional 'holes to permit the passage of bolts 15 and 16, and nuts 17 ad 18 tightly clamp the holding plate 3 in position so that the heater element is tightly clamped between plates 1 and 3 and is prevented from shifting because said terminal members 19, 20, 52 and 53 project through the holes in clamping plate 3. The bolts 15 and 16 roject through the cover 2, and the h or vcover 2 is clamped in position by nuts 14.v The terminals 19, 20, 52 land 53 project through holes provided in the cover The hande 5 has at the front thereof a plug device 6 having four .entered 'plug members which will be-later more fully described, and when said handle 5 is in proper lll) position, the terminal plug members of. the

lheater element enter the corresponding entered plug members providedfor. them in said plug member of -handle 5.

The handle 5v is connected to the hood 2 by an arm- '11, which is clamped against iliood 2 by one of the nuts 14. The handle handle 5 and the iron, for supporting the weight of the iron, may be made at the rear' of the iron by means of-arm 11, because the slight frictional engagement between the terminals 19, 20, 52 and y53, and the corresponding plug members located at the front of the iron, is sd small that it produces nol 'substantial gripbetween handle 5 and the iron.

In fact, the plug device located at the front of the handle, could be made entirely separatev therefrom without any diiierence in operat'onof the iron. The handle 5 is made of ever, if the front nut 14 is tghtened'up'on scribed, and which is connected to the .plug j device 6 ,by means vof the screw 7. In this the bolt 15, this ti' htly clamps into position the clamp mem er 4, which is later demanner thehandlecan. be irmly secured to the iron at bot-h ends thereof.

The heater element, which is shown in detail inFigs. 6, 7, 9 and 10 comprises two mica coil plates42 and 43, each Vwhich has substantially the shape and area of half the pressing plate 1, upper mica heater plates 47 and -48 connected to the coil plates 42 and 43 by the heating wire, and protective mica plates 46 and 49. The plates 46, 47 48 and 49 have substantially the shape and area of the pressing plate 1, and the plates 46 and 49 arereadily separable from the other mica plates before mentioned. The bottom protective'lplate 46 is perforated to permit the passage of bolts 15 and 16 and the upper protective plate is perforated to permit the passage of terminalsv 19, 20, 52 and 53,' and of bolts 15 'and 16. The intermediate heater plate 47 and the-upper heater plate 48 have perforations to admit said bolts15 and 16 andthecoil plates 42 and 43 have their adjacent edges recessed topermitthe passage of bolts 15 and -16. The upper heater plate 48 alsoha'sjperforati-ons corresponding to the terminals 19, 20, 52and 53.

The adjacent and outer edges of the plates 42 and 43 are Vprovided with uniformly ary suitable strong insulating. material, such asa-phenol resin, etc. Howcarried over the top of companion'coil plate yco'il'A is passed throughplate 47 andplate ranged and equal slots or recesses S, to hold the windings of heating coils A, B, C.

The end of coil A is bent around thehole in plate .48, which corresponds to terminal 52,. 'The wire is then led over plate 48, and in close contact therewith, until it is passed through hole to the underside of said plate 48.A The wire is always kept in close contact with the plate, and this construction is followed in the other coils later mentioned. The wire of coil A is then passed to the top of plate 48 through hole 71, then to thgunderside thereof through hole 72, and" the wire is thus laced through plate- 48' in this zig-zag manner through holes 73 and 74, so that the rst'turn of coil A is formedon the underside of. plate 42.

The coil A may be separated from coils B and C for a short portion of the rear of the heating element, and is passed' around plate 42 in a spiral-like manner, the adjacent turns occupying the slots S,r until the zone occupied by the coil Bis reached. The coils B and-C are then wound separately in alternate slots S, with their respective' turns separate, insulated from each other, and parallel, until the lzone occupied by the coil C is reached. The coils A, B, and C have their respective turns then located in every third slot S, so that the turns of ,coils A, B,

Vand C are separated, insulated from each The coilA is wound l other, and parallel. in this manner until the last. three slots `S in plate 42 are reached., The' coil A is then 43. The windings of coil A are now conF tinued reversely, to the rear of the vcompanion coil plate 43. It willbe noted that the upper portions of the respective'turns of coils A, B and C are all lparallel to each other, and that the lower respective turns of saidA coils on plate 42 are parallel to each other, and thatwhile the said lower turns on plate 43 are parallel to each other, that the lower turns on plate 42 and on plate 43 are oppositelj7 inclined to the longitudinal axis of the heaterelement. j

It will be noted that the plate 47 is imperforate, save at vthe rear thereof, where the wires of the heating coils are passed through it to be wound around coil plates 42 and 43. Hence what may be termed the laced or zigza portions of the coils are insulated from t e turnsof said coils.

nected structure isv produced.

At the rear of coil plate 43, the wire of 48 to the upper side of'plate 48 and the -wire is then led in zig-,zag fashionas before mentioned, through holes in plate 48, n ntil thev end `thereof is bent under said plate 48 at the hole corresponding tol terminal .20.

The i lheating wires connect thecoil' plates 42 and- V43 to plates 47 .and 48 so that a single con- Hence the first andlastpportions. of coil A 139 unam l r ductors C aIidC2 o fcable C, are connected to terminals and 52.

It will 'also be noted that while the coil A is behind coils B and C at the rear of plate 42, and coil B is behind coil C on plate 42, that the reverse relationship is found on 'plate 43. For convenience the turns ot coil A- have been designated at the rear of Fig. 6 by a broken or dash line, While the turns of coil'B have'been designated by a full line, and the turns of coil A have been designated by a dot and dash line. The first part of the wire of co1l B is bent around the hole finu plate 48 which corresponds to terminal 19, so that thisiirst;

portion is located atthe top of plate 48. The wire is then led to the underside of plate 48 through hole 55` and is then led through holes 57, 58, 59 and 60, and through plate 47, to the underside of plate 42. It may be noted that when the Wire of coil A is led through hole 74, it is also passed through plate 47 to the underside of plate 42. The wire is then Wound asv before men'- tioned and as shown in Fig. 6 until the last turn on coil plate 43 is completed and the Wire is then led through pla-tev 47 to the top of plate 48. The wire is then passed in zig-zag fashion through plate 4, the last portion thereof being on the underside of plate 48, so that the endthereof is bentf upwardly around the edge of the hole in plate 48 corresponding to terminal 2U.

The first portion of coil C is on the upper side of plate 48, and-its end is bent downwardly around the edge of the hole corre# spending to terminal 53. The wire is then led in zig-zag manner through plate 48 until it is passed through plate 47 to thev underside of plate 42. The coils are then Wound as before mentioned and as shown in Big5@ until the last turn on plate 43 has been completed, when the Wire is passed through plate 47 and plate 48, to the upper side of plate 48. The Wire of coil C is then led in vzig-zag fashion through plate 48, so that the last portion thereof is on the underside of plate 48, and its end is bent upwardly around the edge of lthe hole in plate 48 which corresponds to terminal 28.

Hence, each coilLA, B, and C occupies substantially the same area. It is obvious that seven combinations `of heating power can be supplied to the iron, 'so that it can be operated at seven distinct Working temperatures. AThese combina-tions may be ,deslgnated hy the tollowin the respective letter or letters indicating t e coil lwhich is in circuit: 'A,`B, C, AB, AC, BC, ABC. Any of the coils A, B, Ccan be placed in circuit,

by connecting its terminals to cordsA C2 and C.

Hence, even when a very high temperature is desired, there is nodanger of burning out the Wire, as in former devices in which high temperatures were secured by switching out, portions of a heating coil,vso that the maximum heating effect was secured by 4very intensely heating a small length of Wire'which occupied only a small portion of the area of the iron.

With an iron about 71/2 inches long and having the contour shown in Figs. 1-3, which are drawn to scale, I prefer to make coils A, B, and C of substantially the same length, namely, 111/2 feet and to orm substantially 55 turns in each coil. 'The said coils A, B, C are made as long as is possible While maintaining proper insulation, since these coils are naked, andare insulated only by their spacing on the mica plates.

With the lordinary voltage of one hunv dred and ten (110) volts, I prefer to have coil A consume `170 watts, coil B consume 220 Watts, and coil C consume 270 watts. If the Wire of said `coils is made of proper ina-terial, such as the nickel-chromium alloys now on'the market` it is never necessary to heatthese coils beyond a temperature at which the Wires have a straw color, and this temperature is so low,'that the Wire has very long, practically perpetual life.

At the holes in plate 48 corresponding to terminals 19, 20, 52, and 53, the bent ends of the Wires of said coils A, B, and C are engaged between the bases 68 of said terminals, and the bases 62 of socket members 61. These socket members 61, which are made of any suitable metal, have their body portions orced tightlyv into the hollow odies of metal terminals 19, 20, 52 and 53 so that a rm frictional hold is secured and satisfactory electrical connection is secured between the heating coils and the four terminals. The terminals arel also iirmly secured to plate 48 by said socket members 61,

19, 20, 52 and 53 being adapted to pass beu tween one -oI said pairs of blades, to be y Aengaged by them for securing satisfactory electrical -Contact.

For convenience, that side of the iron which is at. the left of a person holding the iron may be called the lett side of the, iron and this is the side. shown in Fig. 5. A

bent, metal blade 85 is hold in place by aunt 34, engaged by asuitable screw passing laterally through the plug device 6; -The 7 bladc has a cooperating short bla-de 36.

One end of cord C2 is clamped by said nut 35, so that blade 35 is constantlyconnected to one terminal of the source ofgelectric cur"-v rent.

Hence the terminal 20,- whose reduced flat. end is clamped between blades 35 and 36 when the device is assembled, is always connected to said terminal ot the current, and, as can be seen in Fig. 6, one of the ends of each coil A, B, and C is always connected to one of the terminals of the current. l

The blade 38 which corresponds to the reduced flat end 39 of terminal 19 has the top 38 bent and passing through a hole in plug device 6 to the right side of said plug device. This blade has a cooperatlng shortblade 37.

The terminals 19,20, 52 and ,53' all have .the same contour, and terminals 52 and 53 are engaged by sets of blades similar to general construction to blades 35 and 36. Only blade 38 isxbent so as to have thel ends thereof at opposite sides oplug device .6,

minal 53 is designa as shown in Fig. 4. The long blade which engages terminal 52 is-designated' by 52 and the correspondi hand side of plug device 6, each s'aid member T bein insulated from the others.

Hence tie circuitA is closed at the right side of plug device 6 as follows The .iront switch makes contact between front angular member T, which is electricallyconnected to C4, and blade4 52'.. Hence terminals 20 and 52 are then connected, thus closing the circuit 'through coil- A.

' The middle switch makes Contact between middle angular member T, connected to C',

j and ltop '38 of blade 38. This connects terminals 2O and 19, thus closing the circuit v through coil B.

The rear switch males contact between rear member T', connected to C', and bladel 53. Hence terminals 53 and 2O are connected closing the circuit through coil C.

Any ordinary snap switches maybe em- P ployed in: plug device 6. v*In this embodiment three sepa-rated guide members 28 may be located at the left side of plug devicey. These guide members support! and guide the central port-ions 24 of the switch handles 8. These handles 8 are made of any suitable insulating material. The U-shaped switch levers 29 are respectively vpivoted at`30 to plug device 6. Each lever 29 has a' spring 30 connectedthereto and the top of each spring 31 is connected'to a central portion 24. The U-shaped levers y29 are resilient and it frictionally in the' recesses in which they are located so th at when a switch handle 8 is actuated, its spring 31 is'tensed until it actuates its lever 29 with a snap act to tit firmly and with a frictional hold between a terminal member T land one of the plug blades 52 53', etc.

In Fig. 9, these switches are diagrammatically desi ated by S.

It will le noted that when a lplurality of coils jare put into vthe circuit,ithat they are in parallelyand in the ypreferred embodiment before mentioned, the power consumpc tion inthe various combinations is as iol lows -A B 390 watts, A C 440 watts, B AC 490 Watts, A BC 660 watts.

the working temperatures secured, in comparison with irons of known type. v

While this invention could be used with fewer or'more than three heating coils, I

This power consumption is' -very low for l prefer touse three coils, because two coils will not give the desired range of temperatures, and more than three coils are' unneces# sary for practical purposes. The switches, blades, in plug device 6, and related parts are insulated by plates 41 which have. holes 'through which members 8 can project. v

Plates 41 are held in position by a U-shaped resilient clamping member 4, held in place by screws 7. The bottom of clamping member 4 has openings to permit thepassage of ` theterminals 19, 20, 52 and 53.

I have shown a. referredembodiment of my invention, butit is clear that numerous chan es and omissions could be made without eparting from its spirit; j

.It may be noted as an additional advanta fied t at the current Acarried by each'coil A, B and C is so small that no substantial or harmful sparkin is produced when the circuitfof each'sai coil is broken vby one of theswitches. i

. I claim Y 1. A heater element for electric irons comprising heating coil supporting means, a second insulating plate located adjacent said coil supporting means, the ends of the wire on said coil supporting means being passed through said second plate, and a third insulating.- plate located adjacent saidsecond late and having the said ends of said wire assing therethrough, whereby said insulatmg plates and said coil supporting' means", vare connected by the heating wire.

2. A heater element for electric irons comprising a first insulating plate having the ends ofV a coil located thereon, the wireof of the construction 'before speci-4 said coil being first laced in zig-zag manner *.125

porting means are connected by said wire,

said coil has two terminals on said first plate, and short circuiting is prevented.

A 3. A heater element for electric irons comprising aV irst insulating platehaving both ends of a coil of wire thereon, said wire being Wound on coil supporting means, said coil supporting meansl being separated from said first plate by an intermediate insulating plate.

4. A heater'element for electric irons comprising a lirst insulating pla-te having the ends of each of'a plurality. of coils of wire located thereon, the said ends'of each said coil of wire being laced in zig-zag fashion vthrough said plate so as to maintain the said ends separated and insulated from each other, each of said coils havingl its windings y formed on coil supporting means, and means to maintain. fthe said windings insulatedv from each other and from the ends of the $0 said coils located on the first insulatingplate.

5. A heater element .for electric irons including an insulating plate having holes formed therein, the said plate having the ends of a coil located thereon and adjacent the said holes, and terminals for the ends of said coil comprisingupstanding recessed tubes having bases ad3acent said plate, and of greater diameter than the said holes, and socket members adapted to enter and engage the recessed portions of the said terminals, the said socket members having bases adapted to engage the said plate so that the said plate is clamped between the bases of the said terminal members and of the said socket membersand the ends of the said coil are also clamped to the said insulatin and are held in electrical contact with the said terminals. y

6. A heater element for Velectric irons including three' Yindependent heating coils, each said heating coil being wound Aseparately from the others on coil supporting means, 'and an insulatingplate having the ends ofthe said coils connected thereto, the

-said insulating plate also havingterminals for the ends of the Vsaid coils connected thereto, one of the ends of each said coil being -connected to a'single commonterminal and the other end of each said coilsbeing connected to an independent terminal.

7. A heater element for electric: irons comprising a plurality of independent heating c ils, the saidcoils being'of substantially e same length and` occu ying substantially thesame area'ofthe sai iron.

plate 8. A heater element or electric irons comprising a plurality o independent heating coils, each said coil having a series of wind-- ings on each side of the longitudinal axis of the iron, the windings oi each said coil on one halt1 of the area of the iron being closer to the rear of the iron than the windings on the other half ofV the area of the prising three independent heating coils arranged in parallel, and switch means adapted to separately connect the said coils to a source of electric power, whereby seven heat gradations can be secured, thewattage taken by each said coil being insutlicient to heat the said coil to a temperature at which any substantial disintegration can take place, each said coil occupying a large and substantially the same area of the iron, and being adjacent the pressing plate of the said iron, whereby the heat roduced by each said coil is communicated) substantially directly to substantially the entire pressing area of the said pressing plate.

10. An electric iron having a pressing plate and a heater element, a cover for said `heater element, said heater element having terminals for the heating wire thereof pro- 11. A device according to claim 10 havu ing connecting means adapted to connect said iron to said handle, said connecting means bein from said p ug device.

12. An electric iron having a pressing plate and a heater element, a cover for said eater element, said heater element having three independent heating coils and having four terminals for the ends of said coils projecting through said cover, one of the ends of each said coils being connected to one of said terminals, the other end oi each said coil being se arately connected to one of the remaining t ree terminals and a'plug device having three switches located therein, said plug device having four contact' devices, each said contact device bein adapted to contact with one of said terminals, one of said contacts having a terminal adapted to permanently connect it to one of the conductors of a cable, the contact adjacent the common contact having its top bent to the opposite side of said plug device, said opsite side having' three switch conductors adaptedfto be separately connected t'o thev other conductor'of said cable, and switches independent of and separate saidewtch conductors5 whereby the said switches cause the closing of the circuit "through eh se coil when they are in `the sla-me reiativepositione on sei plug.

which the second mentioned conductor of "the leaofle is' connected to e metal' per by one 0f three metal screws which pass laterally through said lplug device, each of 'said screws connecting ene of seid switch con.- ductors to the ping devlee.

piete, a, bearer element,A e, cover ier seid Leggere heater element, said heater eement having terminals adapted eo project through said cover, ai handle, a, plug having contacts' ocated in recesses thereof ami adapte toen- 13 d di i y gage said terminas, and e U-shapedf clamp eviee accor 61g n c aim .a m-

member adapted to engage saic ping and therein, and means adapted to connect said insulated Ifrom the conuctng membere damp member to lSefi #glug and to the item5.

sei cia-mp member hai/ing e, performed bottogi to permiifl the passage of said terminals.

v in estimony whereof hereunto affix my signeure.

Y SMUELVDESURE.

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