US1558090A - Electrical transformer - Google Patents

Description

Oct. 20, 1925. 1,558,090 I A. A. HOWARD EIJECTRI CAL TRANSFORMER Filed Jan 23 -l924 if U @210 7"? I flz/ZZi J J54 n 4 Patented Oct. 20, 1925.

AUSTIN A. HOWARD, OF CHICAGt), ILLINOIS.

ELECTRICAL TRANSFORMER.

Application filed January 28, 1924. Serial No. 687,968.

To all whom it may concern:

Be it known that I, AUs'rIN A. Howam), a citizen of the United States, residing at Chicago, in the county of Cook: and State of Illinois, have invented new and useful Improvements in Electrical Transformers,

of which the following is a specification.

This invention relates to improvements in electrical transformers. One of the objects of the invention is to provide a transformer which can be easily and cheaply made and which will be strong and durable. I have here shown the invention as embodied in a transformer such as is used in connection with radio apparatus for the amplification of waves at radio frequency.

In making such transformers, two coils are employed, aprimary coil and a secondary 0011. These coils are arranged in mductive relation to each other and must be supported properly in this position. By the use of my invention I am able to do this in a very simple manner.

Other features and advantages of my invention will appear more fully as I proceed with my specification.

In that form of device embodying the features of m invention shown in the accompanying rawings, Figure 1 is a top plan view of a complete transformer, Fig. 2 is a similar view showing the outer or secondary coil removed, Fig. 3 is a vertical, sectional view taken through the member which su ports the wires forming the transformer, 1g. 4 is a view on an enlarged scale taken as indicated by the line 4 of Fig. 1 and Fig 5 is a view similar to Fig. 4 showing'a modified form.

As shown in the drawings, 10 indicates a cylindrical sup rting member here shown as'inade of insu ating material such as fiber,

bakelite, hard rubber or the like. This cylindrical member is virtually a section of tubing with a relatively thick wall.

In the'outer surface of the member 10 is cut a. spiral groove 11. The turns of this groove 11 are spaced apart the distance at which it is desired to space the turns of the primar coil. The groove 11 is made with a dept equal to the distance which it is desired to space the primary or inner coil from the secondary or outer coil. Obviously, the wall of the memberlO must be of suflicient thickness to permit the re uisite depth of the cove 11 and still furnis sufficlent strengt to support the wires.

12 indicates the wire forming the inner or primary coil. This wire is wound in the bottom of the groove 11.

The wire 12 may be insulated as shown or it may be bare wire. Preferabl the supporting member 10 is made out of lnsulating material, as stated above, so that the wire 12 may be bare wire; and when such wire is used "the turns are properly spaced and insulated from each other by the groove 11.

13 indicates the wire forming the outer or secondary coil and 14 the insulation thereon. In coils of this kind, the secondary coil is ordinarily made of thicker wire as shown. As here shown, the secondary coil is wound on the outside of the cylindrical support 10, the wire being so large that the turns will not enter the grooves 11. As here shown, there are more turns of the secondary coil than the primary coil. It is obvious, however, that, if desired, smaller wire could be used for the secondary coil and the turns Wound so that they would not lie parallel with the grooves 11. If so wound, they would not enter the grooves.

If desired, after the primary coil is wound in the grooves 11, these grooves can be filled with some insulating material 15 as shown in the modified form in Fig. 5; and

the secondary wire indicated by l3 -could then be as small as desired and wound on the outer surface of the support 10 as desired. It' would be prevented from entering the grooves llby the filling substance 15. This substance could be any suitable material and preferably should be insulating material such as fiber, cement, shellac, or any suitable substance.

In either of the forms,'any of the coils could be made either with bare wire or insulated wire as desired. If bare wire is used the turns would have to be separated from each other sufficiently to insulate them from each other, and obviouslythe support 10 would have to be made of insulating material.

The transformer may be mounted in any suitable manner such as by means of vthe bolts 18 fastening it to any suitable .supports 19. V

While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention 88 disclosed in the 'in said appended claims, in which it is my intention to claim'all novelty inherent lngny invention as broadly as possible in view of the prior art.- v o What I claim as new, and desire to. secure by Letters Patent, 1s: p "1. A. device of he character described comprising a cylindrical support having a spiral groove in its outer surface, a laid in the bottom of said groove, the depth of said groove being greater than the diamstar of the wire laid therein, and another wire wound on the outer surface of said support and not 1 ing in said groove.

2. A device 0 the character described comprising a cylindrical supportof insulatingmaterlal having a spira Y ve in its outer surface, a wirelaid in t e bottom of said groove, the depth of said groove being greater than the diameter of the wire lai therein, and another wire wound on the outer surface of said support and not lying groove.

. 3. A' device of the character described comprising a-cylindrical support havinga 4. A device of the character described i comprising a cylindrical support having a spiral groove in its outer surface. an inner spiral coil of wire wound on said support and laid in the bottom ofsaid groove, the

ve being greater than the diameter of t e wire laid therein, and an outer spiral coil of wire wound on the outer depth of said surface of said support and not lying in said groove; whereby said inner and outer spiral coils of wire are spaced apart.

In witness whereof, I have hereunto setmy hand and seal this. 19 day of January,

AUSTIN snowman. q

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