US1699117A - Inductance coil - Google Patents

Description

Jan. 15, 1929. 1, 6 99, 117

S. L. NORVIEL INDUCTANCECOIL Filed Feb. 10. 1926 I/WT/VESS vi gzv K9. M M

UNITED STATES PATENT OFFICE.

SCOTT L. NORVIEL, LOS ANGELES, CALIFORNIA.

Application filed February 10, 1928.

INDUCTANCE COIL.

My invention relates to a construction of an inductance coil, and a support therefor, principal ob ect the provision and has for its of an improved coil and supporting structure of a character which Wlll be highly eiiicient in use,

One of the principal ob ects of and inexpensive to manufacture.

my invention is the provision for an improved construction, of the character described in which the inductance coils are so wound and mounted in relation to the supporting members as to reduce or tend to reduce to a minimum, the losses of electrical energy due to dielectric leakage by absorption, and inter-turn capacity. Also, I propose a construction of the character described, so designed as to dimin- 1Sl1 losses of electrical energ and eliminate the undesirable effects resultant irom such losses when these inductances are employed as instruments in radio apparatus, as tuning inductances, radio frequency transformers,

varlo-couplers and the like.

Other objects will appear hereafter.

The invention consists of the combinations and arrangements of parts hereinafter described and claimed,and will be best understood by reference to the accompanying drawings which form a part of this and in which,

specification,

Fig. 1, is a side elevational View of a construction made in accordance with my improvements; Fig. 3 is an end elevation thereof; and Fig. 2 is a cross sectional View, taken substantially on line 2-2 of Fig. 1.

Figure 3 represents the end view of the coil shown in Figure 1. This illustrates more fully the position and primary inductance 15,

construction of the Fig. 1. The slotted ring 1 1 is supported within the ring 1 by the pressure of the flattened ends of the beams 16 and 17. In this slot the coil 15 is wound consisting of number of turns of insulated wire the inner lead being taken off at 1 5 and the outside lead at 15".

Electrical connection is made to lugs 13-13-by bolts 1919.

It Will be readily understood, by those familiar with the art of radio telegraphy and telephony, with their that losses of electrical energy attendant undesirable effects, are

in a majority of cases largely due to losses in the inductance coils caused by winding the wire composing these inductances with sufiicient spacing between the consecutive turns and upon trio. Radio frequency currents, those of higher frequencies, tend and between an inefiicient dielecespecially to leap or Serial No. 87,229.

jump across from turn to turn of an inductance, unless these turns are separated by a distance greater than that provided by the usual layer of insulation upon wire in common use, and in all dielectrics a certain amount of energy is lost, depending upon the amount of material used and the manner and method of construction.

Heretot'ore, it has been customary to either wind such inductance coils upon a solid cylindrical or prismatic core-form, or in a manner so that the coil will depend upon the support given by one turn to another for suiticient rigidity to make its use practical, or to clamp or cement the turns in position one to another upon a supporting medium, so that uniform spacing and rigidity might be maintained. These structures are costly, incitcient, and unless wound upon substantial tubing, are too delicate for practical use, and furthermore, the material usually used and obtainable for these cylindrical ii'orms is a poorer dielectric for these purposes than air.

y my invention I provide a device, manner and method of construction by which these coils may be wound upon a minimum of solid dielectric material with turns separated by an air gap and constructed with relative parts such that the whole structure is substantial and rigid.

Referring to the accompanying drawing, it will be seen that the construction includes two end-rings 1 and 2, connected at equispaced intervals by cross-beams 16 and 17 secured to the inner periphery of said endrings by machine screws (3, 7, 18, 19 and 20. These rings are made oi bakelite or other suitable insulating material, while the beams are preferably of celluloid or other pliable elastic insulating material. I prefer to make these beams by bending or folding a thin fiat strip of insulating material such as celluloid at an angle which may either approximate the right angle as illustrated in Figures 1 and 2 or be an obtuse angle as illustrated in Figure 3. When constructed as in Figures 1 and 2, the beam is compound and composed of two strips 16 and 17, the two sides 01 which bear upon each other, thus forming a T-beam. Upon and around the outer sides of these beams wire composing an inductance coil in helix form is wound, and the turns thereof securely cemented to each beam, or half thereof, with celluloid or other suitable cement.

In the optional form shown in Figure 3,

the wire 3 is wound inprismatic form and the cross-beams 16 consist of strips of thin celluloid or other suitable insulating material cemented on the inside of the coil at the angles of the prism faces, the center of the strip conforming to the inside of the edge of the prismatic form and the sides of the fold thus formed conforming to the sides of the prism.

From the foregoing" description and drawin it will be seen that in either form the structure of the device is made very firm and solid by reason of the angular bending of the st ips 16, 17, and 16", and the cementin of the turns of wire to them, and that therel 1 have provided a very simple inexpensive form of construction which will permit the consecutive turns to be wound with an air space between them, and yet remain struce turally strong. and ru 'ged, and in which air is employed as a dielectric between the turns and for the most part the winding, and in whicl r solid dielectric supports for the coil are greatly reduced. Thus there is a lessening of losses of electrical energy, and conse quently more efficient piece of apparatus is made, which makes possible a substantial. improvement in the operaton of a radio set into which it may be incorporated, evidenced both by th distance getting powers and selectivity of the set, and which at the same time is economical and inex Jensive to manufacture. By combining? the above descri ed structure as a secondary with the slot-wound primary 15, above descril-ied, the entire device becomes an exceedingly efficient transformer for radio frequency currents due to the fact that there: is a maximum of magnetic coupling between the primary and secondary windings of the inductance, and a minimum of capacitative, (out of phase) coupling. The advantages of this are obvious to those fa-n'iiliar with the art.

While I have described and illustrated the preferred form of construction for carrying my invention into eiiect, it is obvious to those skilled in the art that this is capable of. variation or modification without departing from the fundamental idea or spirit thereof, and I desire, therefore, to be limited only by the following claims 1. In combination, in a device disclcsed, a helix of conductive material, a pair of end rings of dielectric material, a pluraly of relatively thin strips of flexible di i'c material supp-or said "ielix and ex ng' longitiidinaliy thereto, alongitudinal right angle told along said strips, said i, 135 being placed in pairs with their supporting sides extending in opposite directi-ons along he inner periphery of said helix While their axially ez-iten'din Sit abut together, means for cen ien-tit iousl y at aching the turns of the hel' 1 to the supporting side of s id rip, means for supporting the entire device and attachinsi to a base board.

In a dei of the'liind disclosecha: helix of conductive material, a pair of end rings of dielectric i-i'iaterial approximately the size of said helix, a plurality of relatively thin strips of'celluloid supporting said helix and extending; longitudinally thereto, longitudinal right angle fold along s "d strips, means for atta'cl of the kind lidlg the ends ofsaid strips to said end rings'so that one flat side rests against the inner periphery of the helix while the other extends inwardly toward: the axis thereof, said strips being placed in pairs their sides supporting the helix extending in opposite directions along the inner periplr= cry of said helix, while their axially extending sides abut together, means for cementitiously attaching the turns of the helix to the supporting side of s' strip",- means for supporting the entire device and attaching to a base board,

In testimony whereof,- l have signed my name to these specifications;

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