US1553366A - Electric iron - Google Patents

Description

sept. 15, 1925. @553,366

O. A. COLBY ELECTRIC TRON Filed May 9. 1923 WITNESSES: l l l l i INVENTOR a a4 za z'r ze ze @Enq A Colby,

I Patented Sept..l l5, 19`25.

UNITED STATE/s 1,553,366 PATENT OFFICE.

ORA. A. COLBY, OF IRWIN, PENNSYLVANIA, ASSIGNO'R T0 WESTINGHOUSE ELECTRIC t MANUFACTURING COMPANY, A CORPORATION 0F PENNSYLVANIA.

` ELECTRIC IRON.

Application filed Kay 9,

an electric iron of relatively simple and. inexpensive construction and that shall em ploy relatively few parts and. shall be easily and quickly assembled and disassembled.,

Another Aobject of my invention is to provide a relatively simple and; inexpensive heating element for an electric iron.

Another object of my invention is to provide a relatively simple terminal construction for the heating element of an electric iron.

In practicing my invention, l provide a sole plate, of substantially triangular contour, .having a longitudinally extending p a portion of the to chamber the-reimsaid chamber 'being wider at the rear end of the iron than at the front end thereof. Two tubes of electric insulating material are located in the chamber adjacent to the side walls thereof'and a continuous electric resistor member is located in said tubes. "f A filling of granular electric-insulating and heat-conducting material is provided in the chamber and in the tubes.A An electricginsulating member that is interlocked with the rear portion of the sole plate is` provided to close the'chamber and to hold the tubes in their' proper operative positions therein and this member carries suit-able contact terminal members electrically connectyand it is effective also to' securely hold the interlocked member in its proper .operative position against the to of the iron. In the single sheet ofv drawings,

Figure 1 is a view, partly in-longitudinal vertical section and partly in side elevation, of an electric iron comprising the device embodying my invention.

.Fig 2 is'a top plan view thereof, with the coverA and the handle member removed and cut away, and Figx is a view, 1n vertical lateral section thereof, taken onthe line Il [Ii-III of Fig. 1.

1923. Serial No. 637,754.

An electric iron designated generally by the numeral 11 comprises a sole plate 12, the bottom or working surface of which is suitably smoothed and polished, as isl usual in the art.`

The member 12 may be of substantially triangular `contour and is provided with a longitudinally extending chamber 13 of relatively low height, which chamber is relatively narrow at the front end of the sole plate, and is relatively wide at the rear end thereof. Integral side portions 15 of the sole-plate are provided at each side adjacent to the rear edge thereof and are located above the bottom portion` of the sole plate 12. The inner opposing faces thereof are angularly disposed relatively to each other to provide a relatively wide opening 16 of dove-tail shape, therebetween for a purpose to be hereinafter set forth indetail.

` rlhe top portion 14 of the sole plate does not extend outwardly to a planey immediately above the rear edge of the sole plate 12 but terminates immediately inside of the hereinbefore described dove-tail opening 16.

A cover member 17, of substantially the same contour as the sole plate 12, is located thereabove and is held in its proper operative position by a single machine screw 18 extending therethrough and into an integral upstanding lug 19 on the top portion 14. A handle strap 21 is securedagainst the upper surface of the cover member 17 by rivets 22 and has secured thereto at the upper ends thereof a-suitable handle 23.

A heating element for the iron comprises two tubes 124,V of electric-insulating material, that are located in the chamber closely adj acent to the walls constituting the sides thereof.' The front end of each of the tubes 24 is provided witha beveled portion 25 which may be obtained by ,cutting olf `a small portion of each of the tubes 24 angularly rela; tively to the tubes themselves. The amount of material cut oft' is such as will permit of locating the front ends of the two tubes in close operative engagement relatively to each other and relatively also to the walls of the chamber 13. This construction permits of locating the two tubes in their proper operative positions in the front end ofthe chamber. 13 and prevents any turning movement of the two tubes relatively to each other.

A resistor member 26 comprises a helical coil of a suitable resistor material, that is insulating and heat-conducting material,

such as alundum. During this operation, the iron may be held tipped up on its front end in a suitable holder.

The ends of the resistor member 26 are suitably secured to terminal straps 28, the lower ends of which aresuitably insulated from the sole' plate 12 by sheets 29 of an electric insulating material, such as mica. Terminal pins 31 are suitably secured to the upper ends of the terminal 'straps 28 by energized by the usual twin supply circuit' any suitable means, such as' a machine screw 32.-; f I

A member 33, of suitable electric-insulating and heat-insulating material and of L- shape in lateral section, is provided to close the opening of the chamber 13. The member 33 is located within the dove-tail open-` ing 16 and is interlocked therewith by having its sides beveled to conform to the bevel of the integral positions 15. This member is placed' in its proper operative position by moving it in a direction at right angles to the working surface of the sole plate 12. If desired, a relatively thin sheet 34, of asbestos, may be placed between the member 33 and the rear ends of the tubes 24,

whereby a more resilient closure of they chamber 13 is effected.

Theheating element of the iron may be conductor 35, the ends of which are suitably secured to contact sockets (not shown) located in ,a contact plug 36, the contact sockets being ada ted to operatively engage the contact pms 31. A helical spring 37 may be provided in the plug 36 to prevent undue kinking or bending of the supply circuit 35.

A guard for the termlnal pins 31 and for .the` plug 36 may comprise a suitably punched and shaped metal member 38l having integral depending portions 39 and an integral forwardly extending portion 41 for permittino of securing the same against the top of the cover 17 by one of the rivets 22.f

A suitable opening 42 is provided in the rear of the top portion of the cover member 17 through which the terminal pins 31 may extend.

The dimensions of the member 33 are such as to cause it to iit closely between the cover member and the upper surface of the rear edge'of the bottom portion of the sole plate 12 when the cover member is held in its proper operative position by the bolt 18.

This fixes the position of the terminal pins 31 which as has hereinbefore been described, are suitably mounted in the member 33.

A sheet metal member 43, of substantially `L-shape, may ha e one portion thereof secured to the insi e of the cover member 17 and have its outwardly extending portion return bent, substantially as shown in Fig. 1 of the drawing. The member 43 co-operates with the plug 36 or with the outer edge of the guard 38 to support the iron in a backwardly-tilted position whenever de'- sired. l

The chamber 13 may be suitably cored out and does not require any machining operations. The lateral dimensions of the chamber 13 may be 4made any 'suitable value inorder to co-operate with the granular heat-conducting material located therein to lprovide a relatively uniform temperature over the entire working surface of the bottom of the sole late 12: The member'33, being interlocke with the"v sole plate 12, holds the tubes 24 in their proper operative spaced positions in theiron and if it -is necessary to replace the heating element,

this member maybe easily and quickly removed from its operative engagement with the sole plate aftergthe cover member has been removed. After this, the tubes and the resistor member located therein may also be easily and quickly removed and new ones substituted therefor.

Various modifications and changes may be made without departing from the spirit andscope of the invention, and I desire,

therefore, that only such limitations shall be. placed thereon as are imposed by the prior art or are set forth in the appended claims. y

I claim as my invention:

1. An electric iron :comprising a longitudinally chambered sole plate, a plurality of tubular electric insulating members in said chamber, an electric resistor member in said tubular members and means interlocked withl said sole plate for holding said tubular members in proper operative positions in said chamber.

2. An electric iron comp-risinga longitudinally chambered sole plate, a plurality .of tubular electric-insulating members in said chamber, a continuous resistor member 1n said tubular members, afilllng of granular electric-insulating, and heat-conducting y material in said chamber and in said tubular members, and means interlocked with said sole plate for holding said tubular members 1n proper operative positions in said chamber.

3. An electric iron comprising a lon tudinally chambered sole plate. a plurality of tubesof electric-insulating material in said chamber and operatively engaging the side Walls thereof, a continuous electric resistor in said tubes, a illing of granular, electric-insulating and heat-conducting material in said chamber and said tubes, and an electric insulating member, interlocked with said sole plate, for closing said chamber and for holding said tubes in proper operative positions in said chamber.

4. An electric iron comprising a longitudinally chambered sole plate, a plurality of tubes of electric-insulating material in said chamber and operatively engaging the side Walls thereof, a continuous electric resistor in said tubes, a lilling of granular, electric-insulating and heat-conducting material -in said chamber and'said tubes, an electric-insulating member interloked with said sole plate for closing said chamber, and a pair of Contact terminal members for said resistor member projecting through and supported by said electric-insulating member.

5. An electric iron comprising a longitudinally chambered sole plate, a plurality of tubes of electric-insulating material in said chamber and operatively engaging the side Walls thereof, a continuous electric resistor in said tubes, a lling of granular, electric-insulating and heat-conducting material in said chamber and said tubes, an electric-insulating member interlocked with said sole plate, for closing said chamber and for holding said tubes in proper operative positions in said chamber and a cover member on said sole plate for covering the same and for holding said electric-insulating member against an upper surface of said sole plate A ln testimony whereof, I have hereunto subscribed my name this 7th day of May 1923.

ORA A. CGLBY.

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