US1564449A - Securing armature coils - Google Patents

Description

Dec. 8, 1925.

G. B. SAYRE SECURING ARMATURE COILS Filed NOV; 29. 1924 wwmwoz Patented i combo): is. snxnig, .or azaleas-n: new Yonir.

SECURING KRMATUBE COILS.

' Application filed November 29, 1924. seenno. 752,898.

To all whom it may concern Be it known that I, GonnoN B. Saran, a citizen of the United States, and-a resident of Syracuse, Onondaga County, New York,

have invented an Improvement inSecuring Armature Coils, of which the following is a specification.

My vention relates to a method 01' and means for securing coils in armatures or the are provided within. series of recesses near' the circumferential surface, which recesses practice to line the. recesses and teeth with a insulating fibres.

7 of the sma like. Man of these armatures, particularly ller sizes, are made with what. are

called peripheral teeth, that is to say they have narrow throats, and in which are placed the armature coils. It is a common thin insulator, usually paper, and this as a matter of convenience is generally made continuous so as to extend around the surface of the recesses and over the teeth, and it is easier to do this than to use a separate strip foreach individual recess. After the coils method and means of securing the coils, and

also to provide means for securin them so that they are not likely to become oose.

In carrying out this idea, I provide a strip of material which is springy and insulating, and whichis usuall one of the well known throats of the several recesses, and as it passes each throat, I punch from the strip a section of the material which is forced inward through the throat and against the resistance of the coil, and as the punch is of the same width as the throat, it shears the pa or from the throat, pushes the severed strip in'through the throat by reason of bending it lengthwise, and the coil will yield sufiiciently to permit the severed strip to be inserted through the throat and to the outer is is fed opposite the great} improvei.

' Figure- 2 is a detail diagrammatic view showing the manner in which a fastenin strip is cut from the main piece, bent, pushed through the throat, and secured against the outer part of the coil, and j Figure 3 is a. broken enlarged detail perspective view showing the structure" more clearly. Y ...The armature 10 may 'beof any approved kind, and in Figure 1 I have shown it merely in outline, but it is of the type which'has peripheral recesses'll extending across the face, and in which the coils 12 are placed. The. recesses have throats'13 o nin' outward through the peripheral wa lof t e armature, and the shape of the recesses is conventional leaving abrupt shoulders at the inner en ofthe'throats 13, but the contour of the recesses themselves is of course immaterial.

Before the coils ie formed in the rccesses, these are usually lined with sheetinsulation- 14,, which is generally paper, and as a matter of economy in time and convenience of arrangement, the strip is usually extended around the wall of, each recess, then over the adjacent top to the next recess, and so on around the armature; After the coil is fastened in place, it is desirable to remove the paper from the throat 13 and from the outer face of the armature By my improvements I am enabled to ferred manner, but my method of fastening is as follows. A strip of sheet material 15,

preferably insulating fibre of desired stifi'- ness, is fed across the several throats 13 one by one, as shown in Figure 1. The punch 16 is shaped to exactly fit each throat 13, but has its middle portion convex as shown. at

17, leaving a shoulder 18 at each side of the convex part. Consequently by referring to Figure 2 it will be seen that when the part 17 strikes the sheet 15, it will first bend a section as shown at 15, and as the punch advances further it will sever a strip from the indicate corresponding parts in all the views. 1

Figure 1' 1s 'a diagrammatic elevation of apart of an armature showing my invention.

have the paper 14 and the coils. 12 placed in the several recesses in the usual or any presheet as shown Figure 2, and ultimateedges of the strip will spring beneath the shoulders of the throat 13, and as the punch is removed, the tension of the coil 12 will hold the stri 15 securely in place and. in a manner to e ectually 'seal the throat 13.

Moreover it will be observed that when the A shoulders 18 pass through the throat 13 they gage 'one of the throats 13 whilethe punch,

16 18 operating in another, and the means Ifori' will shear 011' the insulating paper 14 atthe entrance to each side of the throat 13, and, the inner parts of the paper will fold beneath the strip 15 as shown at 1 1 in Fi re 3, and these'loose ends will be firmly eld between the coil and the strip 15.

I have not shown the means for stepping forward the sheet 15,- or for'operating the punch 16, as the sheet feed and punch operating mechanisms are so thoroughly known in .the art, and'moreover any of the usual feeding and punching devices can be used.

'In carrying out the invention, however, it is desirable to use a detent 19 which will endoing this it is not necessary to showlbecause it is the most ordinary shop practice. i 'It is] essential to have the face of the punch ltishaped substantially as indicated, however,

art which will, bend the fastening strip 15 efore the shoul-Z. ders of the punch begin to shear the strip and shear the paper 14. So. far as the op? eration of the punch is concerned, 'it will be seen that the walls of each throat 13 serve as one member of a die, the punch forming. the other member, and it will be furthervunderstood that there is a very substantial re--, sistance by the coil 12 to the final movement of the punch 16, so that the reaction of thethat is to have a convex coil is suflicient to bind the 'strip l5 firmly the strip being forced out, while at the same time it secures the coilagainst displacement. I claim 1. The combination'an armature havmg recesses with peripheral throats nar rower than the recesses-of coils in said recesses, and insulating strips extending the full length of the throats and overlapping the inner walls thereof so as to lie between thecoils and the outerrecess walls thereby sealing the throats for their full length.

2. The improvement in the art of securing armature coils in armature recesses having and permitting them to expand after passing through the throat thereby overlapping the I inner edges of the throat.

3. The improvement in the artof securin Y armature coils in recesses'having peripherall throats, which consists in forcing a strip of springy fibrous material wider than the t roat through the'throat by bending the material lengthwise," forcing-the bent strip against the tension of the coil in the recess,

- and then permitting the expansion and straightening of the strip which causes it to be bound between the coiland the outer 'wall of the recess thereby covering and sealing the, throat.

4. The improvement in the art of securin armature coils in recesses having periphera throats, which consists in punching from an insulating sheet successive strips of material wider than the adjacent armaturethe throat and at the same time causin punch to force the severed stri throng the adjacent/throat and against t e tension of I-the contained coil in the adjacent recess,

which act bends the strip lengthwise,'then close the inner end *leng't w is'e i nid' ;shear I the sheet insulator -from th'e'g thrbat walls "whereby the expansionandstraightening/of the bent strip causesit to seal the inner 'end of the throat onthe withdrawalio'f -the punch and to be positionedby the pressure of the coil between the coils and the ad'acent walls'of]. the recess-11, and thus there is no danger of 1 against it. v v

6. The improvement in the art of securing coils in armatures having recesses ,with'pe iripheral throats and with the throats and flecesses lined with insulating paper, which consists in simultaneously bending lengthwise and forcing through the throat a fastening strip, shearing the paper irom the throat, and then withdrawing the pressure from the strip thereby permitting itto expand and- 'seal-theinner end of the throat.

In. testimony whereof, I have signed my name to this specification this 26th:,day of November, 1924.

GORDON SAYRE.

I so {withdrawing the punch and permitting the I stri to expand so as to of e throat.

5 The im rovement in the art of securing

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