US1370916A - Electric sadiron - Google Patents

Description

UNITED .STATES PATENT s oFFIcr..

4SAMUEL I. RUSSELL, 0F CHICAGO, ILLINOIS.

ELECTRIC SADIRON.

useful Improvements in Electric Sadirons,-r

of which the following is a specification, reference being had therein to the accompanying` drawing.

his invention hasrelation to electrlc sad irons and has for its object the provision of a` sad iron of comparatively simple and economical construction, having an electric heating element so arran d as to impart to the base or sole late of t e iron a maximum degree of heat with a minimum expenditure of current and in which the heating element is so constructed that it will develop heat onl in that ortion which lies within the casing or she of the iron, thus leaving the terminals of the heating element safely and conveniently cool.

The invention consists in the structural features and combinations hereinafter more particularlyV described and claimed. In the accompanyi drawings,

Figure 1 is a side view of an electric sad iron embodying myv invention.

Fig..2 is a rear end view of the same.

Fi 3 isa vertical transverse section on the line II of Fig. 1.

Fig. 4 is a plan `yiew of the' sole plate or base of the iron.

Fig. 5 is a plan view of the pressure plate which rests on the heating element. Y

Fig. 6 is a detached view, partly in section, e

of a part of the heating element.

The structure, as a whole, comprises the sole or base plate 1, the pressure late, 2, the shell or casing 3, the handle hol er 4', handle 4 and heating element 6.

For the purposes of my invention the base or sole plate' l, which is a comparatively heavy cast iron plate, is formed with a continuous serpentine, sinuous or laterall undulating groove or channel 7 of anysultable form, but preferably f the form shown in Fig. 4, produced by the outer fluted flange or wall 8, having lateral extensions 9, and the center partition 10, having lateral extensions 11. yThe groove sections may however be run lengthwise of the s'ole plate or in any other wa which will provide suiiicient s ace and ength for the accommodation o a long heating element, which it is desirable should cover-as great an area. as

Specication of Letters Patent.

Patented Mar.8, 1921.

Application illed October 8, 1920. Serial No. 415,042.

possible, so as to impart heat to all the parts of the sole plate. The heating element, in the form of a length of cord, the specific character of which will be hereinafter described, is laid in the groove 7 so that its ends may be carried out at the rear end of the iron, and this heating element is of such a diameter as to'closely fill the groove 7 The sole plate 1 is cast with a marginal flange 12 toembrace the walls of the shell or casin 3, the latter bein Va pressed steel hollow body of the usua shape, having holes at 1 1 for the passage of the ends of the heating element.

The pressure plate 2 is a metal casting having the same form in marginal outline as the sole plate, but smaller than the latter, f

so as to lie within the shell 3 while resting on the flanges forming the groove and is cast with a central hollow boss 12 of such length that its upper end is in contact with the under surface of the shell 3 when the parts of the iron are fitted together as shown in Fig. 3 and sc that when the shell is forced "down the pressure plate will press upon the `end a screw threaded socket 14, for the reception of the threaded shank of a headed screw 15, which is inserted through a hole -in the top of the shell and is the means for holding all the parts of the iron together.

The post or pillar 13 terminates avshort distance below the upper end of the boss 12, so as to leave space for the downward adjustment or pressure movement of the shell and pressure plate. The handle 4, of wood or other suitable non conducting material is supported by a U shaped metal strip 4', and is connected to the shell by the screw 15, the plate or strip 4 being formed with indentations 18, 18, to receive corresponding studs 19, 19, formed on the upper surface of the shell 3, by suitably indenting the under surface. These studs and indentations serve to hold the lhandle supporting strip 4 in place and prevent its turning onthe iron.

The pressure plate 2 is formed with a the ends of the heating element, one of the -A notch 20 at its rear edge for the passage of;

ends being run through the hole, 1, at the back of the shell, and the other passed through a hole l in the shell back of the handle strip. The hole l is provided with an insulating ber Washer or bushing 21, secured by screws to the shell.

The heatin element 6 is in the form of a length of' cord, and comprises a central core 5 of asbestos, on which is spirally Wound a Wire 5 of suitable resistance for heating purposes, such as tungsten. This Wire is tightly wound upon the core so 'as to sink into the asbestos, and upon the Wire covered core is Wound an asbestos yarn 6 which forms an insulator of heat conducting properties. Near the ends of .the heating element, the Wire covered core has, for a short distance, Wound upon it and in Contact with the resistancenwire, a copper or other good conducting wire 22, which for its length short circuits the current so as to prevent the ends of the heating element beeomin heated and imparting heat to the shell and other parts of the iron near the projecting terminals. The only part of the heating element which is effective is that part under pressure of the pressure plate hence there is no loss of heat or the development of heat Where it. would be unsafe, inconvenient, or otherwise undesirable.

I claim.

The electric sad iron herein described, comprising a sole plate having a sinuous or serpentine groove in its upper surface, a heating element laid in said groove and consisting of a non-conducting, core, a Winding of resistant Wire, and an insulating shield, a pressure plate adapted to rest upon and compress said heating element, a shell or casing provided with a handle and means for connecting the sole plate, pressure plate, handle and casing together7 and for allowing said pressure plate to be adjusted vertically.

SAMUEL I. RUSSELL.

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