Untitled record

Application filed April 27,1893. SerialNo. 472,064, (Nomodel,)

To all whom it may concern:

Beit known that I, Samuel E. Nutting, of Chicago, Illinois, have invented certain new and useful Improvements in Electric Heaters, 5 of which the following is a specification.

My invention relates to that class of electric heaters in which a resistance wire or series of wires is used, and heat generated therein from the resistance of the wire to the io electric current flowing through the same; and the invention consists in the features, details and combinations hereinafter described and claimed.

In the drawings, Figure 1 represents a plan 15 view of my improved heater; Fig. 2 a sectional view of the same taken on the line 2 of Fig. 1; and Fig. 3 a plan view of a portion of the heater, with the outer covering removed and showing the method I employ for embedding 20 the resistance wires.

The object of my invention is to provide an electric heater, composed of the resistance wires embedded in a non-electric conducting substance and covered with a non-electric 25 conducting flexible covering, in such manner as to protect the wires from direct contact with the air, the whole being light and durable, so that it maybe moved easily from place to place.

A further object of my invention is to provide the heater proper with a covering of mineral wool, or similar substance, and provide the same with an outer envelope of textile fabric, preferably wool, entirely inclosing the 35 heater proper and covering cf mineral wool connecting the terminals of the resistance wires with an insulated cable for furnishing the heater with a supply of electric current.

While I prefer to show in the drawings my 40 invention as applied to a portable electric heater that may be used as a foot warmer, or to supply warmth to any desired portion of the body, I do not desire to be limited to this particular use, as I contemplate using it in 45 connection with various other purposes.

In my preferred construction, as illustrated in the drawings, I employ a base A, formed of a sheet of flexible asbestus material, and secure on either side of the base a series of 50 resistance wires,preferably formed of German silver arranged in a zig zag manner, to compensate for expansion and contraction of the wire during its heating or cooling. The wires are separated from each other, and prevented from coming into electric contact with each 5 5 other by means of the asbestus cord δ. I then fill the space occupied by these wires, preferably, with a solution of silicate of soda, C, and then cover and inclose the wires in the solution with an outer covering D, preferably 60 composed of flexible sheets of abestus material. The silicate of soda becomes hardened, and acts as a cement to unite the base and outer covering, and secure them together. I then surround the outer covering of asbestus 65 material with a packing, E, preferably of mineral wool, and inclose the heater proper with its packing of mineral wool in an envelope G, formed preferably of a woolen cloth, and secure the same together by quiltingorsewing 70 in any usual manner. I then attach to the terminals II and H' of the resistance wires an insulated cable, I, which is connected at its other end with a terminal connector K, adapted to beinserted into an ordinary socket 75 L, provided with a usual switch button, Z,by which the electric current may be turned on or shut off at pleasure.

From theforegoingdescription it will beseen that I have provided an electric heater that is 80 light and portable. The various parts constituting the same are formed of flexible nonelectric conducting materials, so that the same may be conformed to any desired shape, without destroying any of the parts or rendering 85 the heater less efficient.