Патент USA US2124984код для вставки
July 26, 1938. à J. MCCULLOUGH > 2,124,934 ELECTRIC VIRCJN Filed March 28, Y 1936 l D / 1 I Ii a _Zn yen for meer; or is surrounded ; tiofougiiout “i substantie» »fnd reierably is made in ,il en a s length o wi (in the across the iron. A. suriace. Frequently the tioe‘rrnosta‘tic - two sections spaced¢ member aüected more readily ‘oy tile tem» relatively liglit metal sheet extends over heat nerature oi and surrounding tlie heating element ing element il witli its edges oiîset downwardly, jratlier than by the temperature of the portion as at G, to contact with the sole plate. Prefer ably sheet has an intermediate depression l 20 of the iron applied to the article being ironed. Obviously such arrangements do not make for also contacting with the sole plate in the space between the sections of grid al. accurate or eñicient operation or” the thermo Current is brought to the terminals 8 and e stat, and one object of the present invention is to correlate an ironing surface, the thermostatic by any usual plug. Conduct le leads from ter 25 control, the heating element, and the parts minal 8 to one end of the heating grid. Con 25 actuated thereby so that each will possess a' duit il leads from the other end of the grid to the binding'post il. Switch blades i3~and l@ of spring material are insulated from each other at their right hand ends and have contact but tons l5 and lâ, repsectively, on their left hand ends. Blade i3 is connected to binding post i2 high degree of eiîiciency from the standpoint of operation, simplicity of construction, and length of life, etc. 30 . l Another object of the invention is to simplify the manually operated device for varying the temperature of the iron and, incidentally, to give the iron a neat, attractive appearance notwith standing the mounting of the manual control in 35 the handle and the necessity of connecting and blade lil has a connection il to terminal d. Normally the spring action of blades i3 and lll is to thrust eachof these blades' in an anti cloclewise direction as indicated by the arrow A. 35 Thermostatic member 3 comprises a loi-metal such a control to mechanism in the' ironv casing. lic helix oí familiar type although not previous Another object of the invention is to simplify the assembly of the heating element with.` the ly used in electric irons, so far as I am in» iron sole plate and at the same time to provide - formed. Each end oi >member 3 is provided 40 eiiìcient distribution of heat from the element to with` a longitudinal slot, and a. pin ld has the 40 inner face of its slotted head seated against the the sole plate. These and other detail objects which wül be edge of the sole plate surrounding the outer end apparent from the following description are ' of noie 2 with the inner end of the _nin provided obtained from the structure illustrated in the vwith a lip l., fitting into the corresponding slot in member A finger is has its lower end 45 accompanying drawing, in which Figure l is a vertical longitudinal section ñtted into the slot in the right hand end oi through an iron of the type described, a portion member 3 and extends upwardly through the top of the sole plate through sheet 5 and into of the structure being shown in elevation. Contact with an insulation roller 2li carried on the outer end of blade i3. A screw 2l (Figure 4) is threaded into the edge oí sole plate l with Figure 2 is a horizontal section taken sub stantially on the line 2--2 of Figure 1. ' Figures 3 and 4 are vertical transverse sec»v tions taken on the lines 3-3 and vali-Jl, respec tively, of Figure l, Figure 3 showing the parts in a diilerent Figure 2. position > than indicated in . its head overlapping the head oí pin lil whereby pin lil and the adjacent end of the thermo static member may be anchored Vto the soie plate. ‘ 2 arrasar As member t is heated, its bi-metallic con struction causes it to twist so that its opposite ends rotate about its axis in opposite directions. With the right hand end being held against Preferably a tail 3d projects from boss 2t and closes the bottom of slot 2ll as the boss is moved forwardly. rotation, particularly in an anti-clockwise di rection as indicated at X in rFigure t, the left The rear of casing 22 extends beyond the rear end of sole plate i and terminates in a` heel 35 which meets a ñnish strip ¿it extending upward hand end, carrying iìnger i9, tends to -rotate ly from the bottom of sole plate l to the end in a clockwise direction as indicated by they arrow .B in Figure 3. Such rotation oi ringer 10 i9 will move blade i3, against its spring tend ency, to separate contacts i5 and lâ as indi of heel 35. A wire bail 3l loosely mounted on ` plate t between heel 35 and strip 36 cooperates with guard 2d for supporting the iron when 'it is stood on end temporarily' while the material 1.0, to be iron'ed is being adjusted. in this position Upon cooling, the thermostat tends tov return Y elements 35 and 36 are spaced from the iron cated in Figures 3 and 5. ' to its original position. Switch blade [it is re ing board or table. ' 15 cessed at itc to provide clearance ior iìnger t@ Although strip ät añîords a neat ñnish for so that stresses in the thermostat may be fully > the lower rear portion of> the iron, the notch or relieved. By loosening screw 2i and rotating opening 3d therein provides access to screw 2l pin is, thermostatic member 3 may be adjust ed axially to vary the temperature at which it opens the switch or permits the switch. to close. When ringer i@ and blade it are engaged, the reaction of the pressure between them will and plug iii whereby the latter may be adjusted to set the thermostat operation as desired. The construction described is simple and free 20 of a multiplicity oí jointed members particularly in the connection between the switch adjust thrust member 3 against the side oi hole 2, ‘ ment and the control boss 2t. The adjustment creating sumcient friction to retard free twisting device in the present iron comprises a single 25 movement of member 3 and resulting in a lag rigid bar mounted on the handle and therefore 25 between alternate movements of the thermo easily assembled with the casing and switch static member and its nnger. This avoids dut-« mechanism. . tering of the switch contacts and rapid opening Obviously theparticular arrangement of the and closing of the circuit, which is objection.e switch parts and the details of the thermostat dit able because of resulting annoyance in recep and its ñnger, the adjusting switchrand the ele 30 tion of radios which may be on the same house ments engaged thereby, are not essential to all features of the invention and these and other A sheet metal casing 22 is applied to the soie ' details may be varied without departing from plate and encloses the heating element, switch l the spirit oi the invention and the exclusive 35 structure, etc., forming a substantial air cham use of such modiñcations as come within the 35 ber above the heated parts and giving the iron scope of the claims is contemplated. an attractive appearance. It is braced near the I claim: ' middle of the iron by a support di. A handle ~ l. In an electric smoothing iron, a sole plate, a @il is carried on casing 2d, the rear bow of the light metal sheet overlying said sole plate and handle merging in a guard socket 2d -for re cooperating with the top face thereof to form a « ceiving the usual plug’which is applied to ter shallow housing, a heating element enclosed in' "minals d. iEhe front 'portion or bow of the - said housing, and a thermostatic member for handle curves downwardly in an arc se of acir controlling current to said element located be cle.> A portion of this part of the handle isl heath said top face of said sole plate and be hollow to form a chamber which receives a rigid tween said element and the smoothing surface of circuit. segmental bar 2d slidable in the handle fromv said sole plate. I ' the position shown in full lines in Figure i to 2L In an electric smoothing iron, a sole plate, a the position shown in dot and dash lines. S web-like heating element overlying said sole indicates a spring frictionally engaging bar 2e to resist its accidental movement. A slot 2l leads from the hollow interior of the handle and a boss 23 on the upper end of bar 2d projects through slot 2ï so as to be readily engaged by the thumb of the user of the iron. .55 The lower end of bar 2t forms a horizontally tu wedge-like structure 2t, one edge of which slides along a bearing t@ formed on casing support di. The other edge of wedge 2t engages an insulan tion roller t2 having a vertical axis and mount 60 ed on an extension 33 on switch loladeA ld. plate, a thin sheet metal cover for said element cooperating with the top face of said sole plate d@ to form a housing for said element, a switch above said cover, a thermostatic member en closed in said sole plate below said cover, and a switch actuating element extending through said cover and the top part of said sole plate and op 55 eratively engaged by said therrnostatic member. 3. In an electric smoothing iron, a sole plate having along narrow hole leading inwardly hori zontally from one edge' thereof and located be low the top face of said sole plate, a heating ele Obviously movement of boss 28 in the direc ment overlying said sole plate, an electric circuit tion of the arrow SC moves wedge 29 in the op» _ therefor including a switch having a ñnger pro posite direction and thrusts blade id in a direc jecting downwardly into said hole, an elongated tion opposite to arrow A, thereby' moving blade thermostatic member inserted in said hole 65 .it (if buttons l5 and it are in contact) away ’ through the end thereof in said edge until en 65 from finger it of the thermostat, whereby higher closed in said hole and comprising a bi-metallic temperature will be required to produce the helix with one end anchored to said sole plate greater movement of the thermostatv necessary adjacent to said edge and the other end opera to separate contacts i5 and it. Subsequent 70 cooling of the thermostat and return movement of .finger i9 and blade i3 will close the switch sooner than with wedge 29' retracted and ac cordingly' maintain a higher temperature for the iron as may be required for ironing heavier ' , 75 material. tively connected to said finger. 4. In an electric smoothing iron, a sole plate 70 having a hole leading inwardly from one edge thereof, a heating element overlying said sole plate, an electric circuit therefor including a switch, an elongated thermostatlc member in serted in said hole and lying adjacent to one side 75 3 2,124,984 thereof, said member .comprising a iai-metallic helix 'with one end anchored to lsaid `sole plate and the other end operatively connected to said switch, the parts of said helix being so disposed _that heat actuated rotary movement of said member moves a part of said switch and the re action on said member thrusts it against the side of said hole to irictlonally retard the rotary movement of said member. 5. In an electric smoothing iron, a sole plate, 10 a heating element applied thereto, an electric circuit for said element having a switch with an adjustable contact adjacent to said sole plate, a casing enclosing said switch, a handle having an arcuate bow portion mounted on said casing, an 15 iniiexible member on said` handle mounted to slide longitudinally thereof and provided with an arcuate extension housed within said handle said sole plate edge, said pin having a lip en tered in said slot. 9. In an electric smoothing iron, ascle plate having a hole leading inwardly >irons. one edge thereof, an electric heating' element, a circuit therefor, a thermostatic‘ member inserted in said hole and comprising a lai-metallic helix, with a transverse slot in each of its ends, means for adjustably holding the outer end oi said member against rotation comprising a part hav 10 ing a lip in said slot and a screw seated against said edge and clamping said part, and means ior controlling said circuit including a finger ?tting in the slot at the other end ci said member and movable by axial rotation of said other end 15 of said helix. ' l0. In an electric smoothing iron, a sole plate, a, bi-metalllc thermostatic member enclosed portion and projecting into said casing and op between the top and bottom of said sole plate, eratively connected to said contact. an electric resistance heating element for said sole plate, a circuit therefor, and means actuated by deformation of said thermostatic member' irrespective of the expansion and contraction of _ 6. In an electric smoothing iron, a sole plate of the usual contour, a heatingß element overlying said sole plate, a thermostatic member enclosed in .said sole plate, a iinger connecter to said member and projecting upwardly from said sole the surrounding sole plate' for controlling said circuit. 25 , plate near the center thereof, a switch for con-l trolling current to said element and including a ll. In an electric smoothing iron, a sole plate, a thermostatic member enclosed between the movable part engaged by said ñnger, a casing mounted on said sole plate and housing said ele ment, finger and switch, a handle having a bow curving from one end downwardly and inwardly to said casing, and an arcuate arm slidably mounted in said bow with its lower end termi top and bottom of said sole plate and comprising nating adjacent to said finger. and part for regu-- a bi-metallic helix, an electric resistance heat ing element, a circuit thereof, and means actu 30 ated by heating and cooling of said, helix for respectively opening and closing said circuit to control the supply of current to A‘said element >irrespective of the expansion and contraction of lating said switch and with its upper end termi nating in a manually engageable device movable along the front portion of said handle. 7. In an electric smoothing iron, a sole plate, a heating element, a thermostatic member for the surrounding sole plate. controlling the supply of current to said heat ing element, a handle provided with a hollow portion, there being a slot in the tace oi.' said handle leading to said hollow portion, an in flexible bar slidable in said hollow portion and having a boss projecting through said slot for manual manipulation of said bar, said bar in-v cluding a part closing said slot in front oi' and at the rear of said boss, and means actuated by' said bar to vary the operation of said thermo ment and including a member adjustable to diiïerent positions to open and close said circuit at different temperatures, a handle' spaced sub static member. 1 » l2. in an electric smoothing iron, a sole plate, an electric resistance heating element associated therewith, a thermcstatically operated switch for controlling the'ele'ctric circuit o! said ele stantially above asid sole plate element and switch, and a manually movable inflexible device extending from said member to the upper por tion of said handle, every part of said device being movable in the arc oi an upright circle. . 13. In an electric smoothing iron, a sole plate, means for heating said sole plate, a handle i'or manipulating the iron, said handle including a having a hole~ leading inwardlyirom one edge hand hold spaced above said sole plate and an arcuate portion between said hand hold and the thereof,- an electric heating element, a circuit sole pla‘ , a manually adjustable inñexible de 3. In an electric smoothing iron, a sole plate - therefor, a thermostatic member for controlling vice adjacent said hand hold, and an arcuate said circuit` and inserted in said hole and com 55 prising `a* iii-metallic helix, with a transverse slot in its outer end, and an anchorage for said member operatively connecting said element ‘to said means and movable in said arcuate portion along the line of its arc ` ' l outer end comprising an axially adjustable pin and a holding screw therefor 'seated >against PAUL J. MCCULIDUGH.