Патент USA US2387281код для вставки
UcLZB, 1945. vE. o. MORTON STEAM IRON Filed July 29, 1942 INVENTOR ELDRED QMORTON. ATTORNEY 2,387,281 Patented Oct. 23., 1945 STATES mrr. 2,387,281 smart men Eldreol 0. Morton, Mans?eld, Qhio, assignor to Westinghouse Electric Corporation, East Pitts burgh, Pa, a corporation or Pennsylvania Application July 29, 1942,_Scrial No. 452,704 7 Claims. (oi. 38-77) ' tion of the iron as a steam iron is materially re This invention relates to steam irons, and par ticularly to that class of steam irons known as the ?ash-boiler type, which include a steam generator and a valve controlled water supply, and. it has for an object to provide an improved steam iron of the character set forth. ‘ duced. From this, it follows that the iron may be used for longer periods without the necessity of cleaning such ‘lime or scale from the steam gen erator. ' ' These and other objects are e?ected by my in» vention as will be apparent from the following description and claims taken in connection with ' In steam irons of this class, water is fed to a steam generator, preferably located in the sole the accompanying drawing, forming a part or this plate, at a rate which allows the water to be in which: ?ashed almost instantly into steam. The gen 10 application, Fig. 1 is a vertical longitudinal section of a erated steam is distributed to thematerial being steam iron made in accordance with the present ironed or steamed by means of ports or the like ' which communicate with the steam generator and open on the ironing surface of the soleplate. Irons of this type are usually provided with ther invention; ' ‘Fig. 2 is a plan view of the soleplate of the iron 15 illustrated in Fig. 1; Fig. 3 is a transverse section taken substantially mostatic means responsive to the temperature of the soleplate and adjustable to maintain the sole plate at a temperature selected in accordance with the material to be pressed or ironed. ' ‘ In the so-called “dry” iron, the'manner of ar on the line llL-DI of Fig. 2; and, Fig. 4 is a bottom plan view of a cover plate for 20 ranging the thermostat and the soleplate heating element to obtain correct temperature control and the soleplate. f The steam iron, generally indicated Iii, illus trated in the drawings is preferably electrically heated and comprises a metallic soleplate ii, a sheet metal cover or shell member l2 and a, plastic or wood handle it, which are secured together in soleplate is a relatively simple problem in that the any suitable manner. The interior of the cover 25 major loss of heat from the soleplate is that ex a uniform distribution of heat throughout the . tracted by the damp material being pressed, is provided with a partition M. which, together with the side and top walls thereof, de?nes a which engages the entire under-surface of the water storage chamber or reservoir it. soleplate. It will be appreciated, however, that The reservoir i5 is supplied with water through when a steam generator is incorporated in the 30 a ?ll tube it which may be brazed or otherwise soleplate and heated by the same heating element secured in fluidtight relation in the topwall of which heats the ironing surface of the soleplate, a the cover it. This ?ll tube extends through an second major heat loss is encountered, that is, the opening in the rear part of the handle l3. A heat necessary to vaporize the water in the steam ’ ?anged bushing ii is screw-threaded on the tube and engages a shoulder it provided in the men It is, therefore, an object of this invention to tioned opening in the handle to secure the rear provide an emcient steam iron, which may be used , part of the handle to the cover. The fore part of either as a “dry” iron or as a, “steam” iron, hav the handle may be secured to the cover E2 in any ing a substantially uniform distribution‘of heat I throughout the ironing surface of the soleplate 40 suitable manner (not shown). The upper end of the ?ll tube ‘i6 is normally and also capable of accurate temperature control closed by means of a cap l9 having a gasket 2| regardless of whether the iron is being used as a which seats against the flange of the mentioned "dry” iron or as a “steam” iron. ' ' bushing ll. This cap is biased into closed posi It is a further object of the invention to provide tion by means of a tension spring 22. secured at an improved steam iron construction‘ in which the one end to a lug 23, formed on the undersur temperature control means therefor responds face of the cap, and to a wire clip 24 at the other quickly to changes in temperature of the soleplate. end thereof. This clip engages the lower end of Another problem encountered in this class of the ?ll tube It. The cap it may be pulled away steam irons is that of obtaining sumcient volume generator. , - 1 I fromv the?ll tube to permit the reservoir to be in the steam generator and evaporating surfaces 50 ?lledv or emptied by inserting a ?ngernail under the tapered edge of the cap at the point 25. through the steam discharge ports. Further, by ‘ The metallic soleplate l l is detachably secured providing a maximum evaporating surface in the therein to prevent water from being carried out steam generator, the tendency for lime or scale to’ build up in a concentrated region‘ in the steam generator to a point where it will affect the opera in any suitable manner to the bottom of the cover l2 and preferably in spaced relation to the par tition It to at least partially thermally insulate 2 > 2,887,281 the reservoir I! from the heated soleplate by an intervening'air gap. The soleplate may be of .8! (Fig. 4), and is preferably made oi.’ relatively poor heat-conducting metal to retard the ilow of heat from the hot soleplate to the bushing conventional outline, as illustrated in Fig. 2, and is provided with a heating element 21 which is generally U-shaped, as shown by the dotted lines in Fig. 2, and arranged with respect to the pe member 41 and thereby reduce or prevent va porization of water in the passage N of the bushing. riphery of the soleplate so that it will heat the The cover plate it is soleplate substantially uniformly. sive with th The heating element is preferably cast into me soleplate and may be of well-known construc 10 tion, and comprises an outer metallic-tube- or sheath 2| having a coiled resistance element 29 supported in spaced concentric relation thereto by means of suitable highlyscompacted, heat-con ducting, electrical-insulating material. Power for heating element 21 by adapted to be permits- the steam ' carried along the channels 38 to pass upwardly ‘ over the heating element at the toe of the iron into the mentioned recess" 52 and then down 20 brackets 32, ?xed, to the top wall of the cover II.‘ The conductors are insulated from these brackets and pass through a tube 33' extending through the rwervoir I! and brazed or otherwme secured in iluidtight relation to the provide a ?uidtight joint and prevent the escape of steam, except through ports [3, from the steam generatlng Space 39 and the channels 38.‘ The cover plate may be clamped to the soleplate by means of a plurality of screws 56 receivable in openings 51 in the cover plate and threaded into the soleplate. heating element 21 in series with a menually-ad justable thermostat, generally indicated 34, which may be of any desired construction. 30 As mentioned, water is supplied to the steam generating space 39 from the waterreservoir it; 'Ihe thermostat is positioned substantially cen through the passage ll provided in the bushing trally of the soleplate within the bight of the U member 43. The rate at which the water is fed shaped heating element in a well 35 provided within the space between the arms of the heat 35 to the steam generator is controlled by means 01' a valve stem 53 having an adjustable connec ing element. The thermostat well is defined by tlon, as indicated at 59, with the strut ii. The a partition or wall 38, preferably formed integral with the soieplate. _ - ,, lower end of this valve stem is tapered and is engageable with a valve seat 8| formed in the The wall 3!. together with the raised portion bushing to cut oil the ?ow of water to the steam of the soleplate overlying the heating element. de?nes channels 38 which extend continuously 4° generator and is adjustable relative to tilt valve seat to throttle the ?ow 01' ‘water to the steam along the heating element. These channels, as ‘generator. The upper end 01' the valve stem 58 will appear later, serve to complete the vapori vnation of water and to conduct steam from ‘a extends through a suitable packing gland 62 and steam generator 33. provided in the region of 45 is provided with a for manipulating the valve stem. This knob may the heel of the soleplate. These channels have be provided with a the added function or more or less isolating the rate of water flow tor the particular setting there thermostat from of in order to equalize the pressures within the steam generator 39 and the channels 38 and the ‘water reservoir to insure a continuous ?ow, by The steam generator 33 is formed by an open gravity, of water from the water reservoir to the ing extending through the soleplate and with which the channels 38 communicate. This re a steam generator, a-vent is provided in the form cess is closed ‘at its lower end by means of a re 55 of a tube 64 which communicates with the chan-' nels 38 at their Junction and with the interior of movable annular disc or plug 40 which is re the water reservoir above the normal‘ liquid level ceived in an enlarged portion of the mentioned thereof. The construction 01' this vent may be recess. The central opening in this plug receives a headed member ll having a screw-driver slot ‘ in accordance with that disclosed in my copend ing element 21. I! or other suitable means for engagement of a 60 member ll is threaded onto a bushing 43 having a central ‘passage 44 there connects the water reservoir. 15 with the steam-generating space 39, as will ap ing application bearing Serial N0. 433,701 and ?led March 7, 1942, for Steam irons and assigned to the assignee of the present application. , The vent tube 64 is preferably brazed or other wise secured in ?uidtight relation to the parti pear later. _ l . 65 tion I‘ of the ‘water reservoir and extends in ?uidtight relation through an opening 65 pro The bushing 43 is threaded into the lower end vided in the cover plate 5|. The upper end of , of a tubular'strut' 4! which is‘ preferably brazed the tube projects within ‘a recess 86 provided in or otherwise secured in i'luidtight relation to the the handle. A cap member or steam dome 61 upper and lower walls of the water reservoir. also extends into this recess about thetube l4 43 hasclamped thereto. as by means and is brazed or otherwise secured in ?uidtight of a nut I! and a cooperating shoulder 41 formed relation to the cover ii. A ba?le plate 68 hav thereon. an annular thin metal disc 48 which ing openings 69 therein may be provided about serves to close the top 01' thefsteam-generating the tube M to prevent water from accidentally space 39. This disc 48 is seated in an enlarged portion or an opening 49 provided in a cover plate 75 splashing up into the vent tube as the iron is moved to and fro over the material being pressed. 3 2,887,281 sary to connect the conductors 3| to a suitable source of electricity, such as. the conventional said soleplate and arranged with the bight there of directed toward the front end of'said soleplate, said passage being disposed between said heating means and said thermostat well, the rearwardly extending ends of said U-shaped passage open household convenience outlet, and adjust the ther ing in said steam-generating space whereby - mostat 34 by means of a lmob ‘H. ~'I'his'knob steam generated within said space may pass along said passage to the front end of said soleplate, and means adjacent the front end of said iron Operation To use the iron as a dry iron, it is only neces is connected to the thermostat by means‘of a rod 12 extending through a sleeve 13 secured in fluidtight relation to the upper and lower walls of the water reservoir; In using the .iron as a conventional .dry iron, the water-valve'knob $3 is left at its “011" position so that water will not enter the steam-generating space 39. When it is desired to use the iron as a steam iron, to moisten or dampen the clothes while iron ing, the operator turns the water valvé knob 63 to the desired setting’ to provide the correct‘ amount of steam for the particular material being ironed. It is, of course. assumed that the water 20 reservoir has been ?lled with water and the sole plate is up to its selected temperature. With the valve stem 58 raised from the ‘valve seat 6!, the water in the reservoir ?ows through openings ‘it provided in the strut 65 into the passage 66 and falls in the center of the screw member M from' which it can flow into the steam-generating space 39 through openings '15. Since the plug 58) is'in direct contact with the hot soleplate, the water will be ?ashed almost instantly to steam and will flow along the channels 38 to the fore part or toe of the iron. In the event that the water is not completely vaporized in the ‘steam-generating space 39, further heat will be rapidly added to the water as it moves along the channels 38, since the channels‘are closely adjacent the heating ele-; ment 21, and complete vaporization of the water will be obtained. When the steam reaches the communicating with said U-shaped passage’ for‘? discharging steam from. said passage to the material being pressed. ' _ ' 2. A steam iron comprising a soleplate, a steam generator carriedby said soleplate and located ‘ adjacent the rear end thereof, means for sup plying water to said steam generator, electrical means'for heating said soleplate‘and said steam generator, said heating means extendingjrom the rear to the front end of said soleplate along the sides thereof, thermostatic means mounted on said soleplate adjacent the‘lower surface thereof for controlling said electrical heating means, a . passage communicating at one end with said steam generator and extending toward the front end of the soleplate closely; adjacent said heating means and in good heat-receiving relation there to, said steam generator and passage being dis posed horizontally between said thermostatic means and said heating means and limiting the direct conduction of heat from said heating means to said thermostatic means, and means at the front end of said iron communicating with said passage for discharging steam from said passage to the material being pressed. 3. A steam iron comprising a soleplate, a heat ing element carried by said soleplate, a thermo stat mounted, substantially centrally of said vsole- _ plate, a steam-generator provided adjacent the fore part of the iron it passes up into the recess rear of said soleplate, means for supplying water 52 in the cover plate and then down through the 40 to said steam generator, passage means formed ports 53 to the material being pressed. on said soleplate ‘and extending from said steam As the iron is used, there may be an accumu generator to the forward end of said soleplate, lation of lime or scale deposited on the plug ti! said passage means together with said steam gen and within thecentral recess of the screw mem erator substantially circumscribing said ther ber M. This may be readily cleaned therefrom mostat, said heating means, thermostat, passage by removing the screw and the plug. Removal of these parts also provides access to the rear part means and steam generator being dispose‘dnin substantially a common plane with the passage means and steam generator located between said heating means and thermostat, and means for It will be appreciated that very little deposit .50 discharging steam from said passage means to will accumulate in the fore part of the channels the material being pressed. since the water will be vaporized by the time it 4. A steam iron comprising a soleplate, electri of the channels 38 so that any therein may be cleaned. deposits formed ' I reaches the forward end of the iron. However, if cal heating means for said soleplate extending desired. the plug member so may extend for-. from rear to front adjacent the side edgestliere wardly to form the bottom wall of a portion of 55 of, thermostatic means mounted substantially the channels 38 so that on removal of the plug centrally on said soleplate for controlling said member a substantial portion of the channels is heating means in response to the temperature of exposed. ' said soleplate, a steam generator carried by said While I have shown my invention in but one soleplate, means for supplying liquid to said steam form, it will be obvious to those skilled in the art 60 generator, passage means provided in said sole that it is not so limited, but is susceptible of plate and communicating with said steam gen various changes and-modi?cations without de erator for receiving steam therefrom, means for parting from the spirit thereof, and I desire, discharging steam from said passage means to therefore, that only such limitations shall be the material to be pressed, said passage means placed thereupon as are speci?cally set forth in 65 and steam generator being disposed between said the appended claims. heating means and said thermostatic means and What I claim is: substantially circumscribing said thermostatic l. A steam iron comprising a soleplate. a‘ U means for restricting the direct conduction of shaped heating element carried by said soleplate and arranged with the bight thereof directed 70 heat from said heating means to said thermo static means. ' toward the front end of said soleplate, said sole 5. A steam iron comprising a soleplate, a sub plate having a steam-generating space formed stantially U-shaped electric heating element of therein adjacent the rear end thereof, means for the sheathed type imbedded in said soleplate with ' supplying water to said space, a thermostat well formed in said soleplate within the bight of said‘ 75 the bight thereof directed toward the front end of said soleplate and with the arms thereof ex. heating means, a U -shaped passage provided in 4 ass-1,281 tending rearwardly therefrom adjacent the side edges of the soleplate, said soleplate having a thermostat-receiving well therein disposed be tween and in spaced relation to the arms or the heating element, thermostatic means in said well for controlling said heating element, said sole plate a passage formed therein between said heating element and said well and circum scrlbing said well, said well, passage “and heating mon plane. means for applying a liquid to be said passage and means communicating with another portion of the pas sage i'or conducting steam generated within said passage to the material to be pressed, said last mentioned means comprising one or more con duits in said soleplate located between the edge of the soleplate and said heating element. 7. A steam iron comprising a, soleplate, a sub ' element being disposed in substantially a common 10 plane, means for supplying a liquid to be vapor med to a portion of said passage and means com municating with another portion ‘of the passage for conducting steam generated within said pas sage to the material to be pressed. ' 6. A steam iron comprising a soleplate, a sub stantially U-shaped electric heating element of . the ‘ sheathed type imbedded in said soleplate with the bight thereof directed‘ toward the front end of said soleplate ‘and with the arms thereof ex rearwardly therefrom adjacent the side edges of soleplate having a thermostat receivlng well therein disposed substantially cen ' the soleplate, said trally of said plate between the arms of the heat ing element, said soleplate also having a,v recess or recesses therein tending rearwardly therefrom adjacent the side edges of the soleplate. said soleplate having a thermostat-receiving well therein disposed be tween and in spaced relation to the arms of the heating element, thermostatic means in said well for controlling said heating element, said sole Dlate having a passage formed therein between said heating conducting said steam to said ports. ‘ ELDRED O. MORTON.