US1668250A - Electric laundry iron - Google Patents

Description

May 1, 1928. 1,668,250

E. J. ROHNE ELECTRIC LAUNDRY IRON Filed March 2 1926 I zwmgrwwwm? Patented May 1, 1928 UNITED. STATES EVEN J. ROHNE, OF MINNEAPOLIS, MINNESOTA ELECTRIC LAUNDRY IRON.

Applicationfiled March 23, 1926. Serial No; 96,672.

One object of my invention is to provide in an electric laundry iron, means for heat ing the sides of the iron to a higher temperature than the center of the bottom.

Another object is to provide means for heating the bottom around the perimeter of the iron to a greater extent than the center portion of the bottom.

Another object is to provide improved means for bringing the connections from the heating unit out to the connecting plug.

Another object is to provide an improved form' of handle.

Another object is to provide improved means for shielding the hand from an excessive amount of heat radiated from the iron itself.

With these and incidental objects in view, the invention consists of certain novel features of construction and combination of parts, the essential elements of which are hereinafter described with reference to the drawing, which accompanies and forms a part of this specification.

In the drawing, Figure 1 is a perspective view of a laundry iron embodying my inven tion. Figure 2 is a transverse longitudinal section of the iron shown in Figure 1. Figure 3 is a bottom view of the heating unit. Figure t is a side elevation of a heating unit and Figure 5 is a section taken on the line 5-5 Figure 3. Figure 6 is an enlarged fragmentary section showing the manner in which the connecting wires are brought out and Figure 7 is a fragmentary plan view of the rear end of the heating unit.

As shown in Figures 1 and 2, the handle 1 is carried on a hollow tube 2, which in turn is suitably joined to the U shaped bracket 3.

This handle is supported on the base 4 of the iron by the studs 5 which screw into the bosses 5 and mica washers 6 serve to help insulate the bracket 3 from the top 7 of the iron and also space it therefrom.

Additional mica washers 8 above the bracket serve to further insulate the guard plate 9 from the heat of the iron and further additional mica washers 10 insulate the second guard plate 11 from the heat of the iron and nuts 12 clamp the handle, guard plates, top and base of the iron firmly together.

The heatin unit consists of the core 13, preferably of cast iron, which is shaped out as'shown in Figures 2 to 5 inclusive, to receive the heating element proper, as indicated by the numeral 14.

It will be noted that the core has apertures therein closely encircling the bosses 5 so as to readily radiate heat from the core to the bottom of the iron thru these bosses. Also the core which is encircled with the heating element itself and heated thereby, has an 1I0I1 to iron contact with the inside surface of the bottom of the iron, thereby giving it greater conductivity between the heating ele- 05 ment and the face of the iron.

It will be noted that the current is brought in from the plug 15 to the plug socket 16 and from there thru the lava bushing 17 the current is carried by the conductors themselves of the heating element, so that the connections are made externally of the iron proper and in the plug socket so the connections are guarded to as great extent as possible from the heat, thus avoiding contact or connection troubles within the iron itself.

To lessen the amount of heat that would be generated in the conductors of the element between the point where they leave the core and the point to where they are connected to the plug socket, I wrap reinforcing wires 17 about the conductors themselves thus giving a greater current carrying capacity to the conductors where they leave the point at which heat should be generated and continue to the point of connection with the plug socket.

In addition to the manner in which the core conducts the heat to the face of the iron itself, attention is called to the fact that there is no seam along the bottom of the iron, but that the entire heating unit is placed on the inside of the iron shell from the top and this construction not only gives greater conductivity in heat, but also prevents the 05 possibility of dampness on account of water or steam getting in thru the seam ordinarily found between the bottom or face of the iron and the outer shell thereof.

Tracing the winding of the heating element, it will be noted that starting at the point 18, the heating element, which is composed of two conductors in parallel, passes downwardly thru the lava bushing 19 positioned in the core 13, to the point 20, looking at Figure 3. The conductors are then led around as indicated at 21 and 22 and pass around the projecting portion 23 of the core and then going about the contour of the core, one of the conductors 24E is in the same plane as the conductors at the points 21 and 22, but the other conductor turns down the Ihese conductors then wind around the.

' outer contour of the core at the base thereof,

as indicated at 26 and continue spirally around the outer contour to the top of the core where they are brought out thru the mica bushing 17 and connectedto the terminal'27.

It will be readily seen therefore, that the outer wall or edge of the iron is heated to. a greater intensity than any other portion and that the face of the base is heated only by two convolutions of the paired conductors and that the center of the face of the base is heated only from the heat transmitted thru the base and the core from the heating element positioned near the perimeter of the iron.

The advantages of this arrangement should be self-evident, as in ironing, the point and edges of the iron are the portions that first come in contact with the dampened and cold garment and when the center of the iron comes in contact with the garment,

as the iron is slid back and forth in the customary manner, the garment is already more neeaaao is required in that base of the iron.

Inasmuch as the entire core is more or less surrounded by the heating element and is heated completely thru, this iron core serves as reservoir .heat to draw from, so that this type of iron will retain heat longer than the portion of the face of the ordinary types heretofore'in use.

In an electric laundry iron, the combination with a base, of a heating unit adapted to be carried in said base, said unit comprising a core which is substantially coextensive with the iron and a heating element wound upon and around the outer vertical Wall of said unit and having a portion thereof wound upon and around in the plane of the lower horizontal face of said unit adjacent that portion of the element that is wound about the outer wall of said-unit.

EVEN J. ROHNE.

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