US1888211A - Mold for insulating an armature - Google Patents

Description

Nov. 22, 1932. v. G. APPLE MOLD FOR INSULATING AN ARMATURE Filed Feb. 5, 1950 Patented Nov. 22, 1932 VINCENT G.ArrLE,or DAYTON, oHIo v MOLD FOB INSULATING lAIRMATUBE `Application led Februaryu3g1930. Serial No.r 425,685.`

This invention relates to molds for in-y sulating armatures and particularlyl for armatures comprising a core, a winding, and a commutator, the winding being composed of 5 magnet wire which is preferably 4covered with a layer of fibrous or other absorptive material. y Y .0

The object of the invention is to provide a mold comprising means to hold the core and the cominutatorin suitably spaced apart relation, and the winding to a definite shape, while fluid insulation is forced'in', through and about the turnsof the winding and over the joints between the-winding and the com l mutator, where it may be hardened while the mold is stillin place, to theend Vthat all of the .uid insulation. used will be retained and be held in proper shapev while` it is `being hardened, that the; several parts .may be permanently held in proper relatlon thereby, and that the covering thus formed will preventtheabsorption o? oil, moisture or other foreign matter the windingand M protect vit agamstphysical injury.

a I attain this object by the structure here-` inafter described, reference being had to the draWing.whereiIi-. V i

' Fig. l is an enlarged topplan view of' y the mold on 'a reducedscale. f

Fig. 2 is an axial 1cross section taken at 2 -2 ofFig.'1. i'

Fig.V 3 is atransverse Sectio of Fig. 2.

0"," of Fig. 2.

Fig.` 5 is atop planview of a segmental' v D side diameter of the commutator 13and supporting ring. v

Fig. 6. is a detail view of one ofthe parts 40. of the mold.

throughout the several views.

The armature 10 comprises "a sleeve. 11V upon which is fitted the core 12 and ,the com- `mutator 13. The winding iscomposed'of a plurality of turns of cotton or similarly .cov-

:0. headsV 14 and`1'5 extend beyond the ends .of u 'the core as in common practice.

n taken at a- Fig..4 isa transverse section taken at Similar numerals referto similar parts-r The commutator13lis of somewhat unusual construction being composed of la Ynum-v ber ofV segments 16- imbedded in the coref17 of insulation. An annular vgroove 18 encircles the outer surface dividing'the risers 55.

19 from the brush track 21. While the core 17 extends voutwardly'between theV segments 16 to keep them spaced apart', it does not extend entirely to the brush track but onlyv to the'line 22, thus leaving spaces23 extending 60 lengthwise between adjacent segments as deep `as the annular groove 18, forming what is generally termed an undercut commutator. The vbrush track 21 maybe trued up when necessary by taking cuts across its di- 65:

ameter'from the outer end and ending in the annular groove 18 without danger of cutting` into the risers 19. f

Since the commutator is of the undercut variety the mold for insulating the armature 701 .must necessarily provide means to keep the insulation from iillingthe grooves23, and.l accordlngly suitable metal spacers are made.

` a part ofthe mold. i p Y n The base'26,.in the main, is in the form 75 of a rectangular plate `but has an integral collar 27 extending upwardly from its` upper surface. A smooth round opening 28 extends` verticallythrough the collar and base and.

lis enlarged at 29 and still further enlarged 80 at 31. A steppedmember 32 having vthreev outside diameters corresponding to the base openings 28, 29 and131 respectively is held lnplace by screws 37. .Member 32 has central openings of three sizes 38, 39 and 41, the- 85' opening 38 being equal to the extreme outthe parts 39 and 41 being filled in by the stepped plug 42.. l

Member32 is cutwith a series of. equally spaced radial slots 43 corresponding to the segments of the commutator in number and to the space between .them in thickness. Thesev slots extend from the top of the memy ber4 32 through its two upper diameters tothe 895 line44. The sheet'metal spacers 46 are .then put in the slots, and occupy not only'all ot the space removed when cutting the slots but. extendinwardly into the opening 38 to'iill the empty space vbetween the commutator seg- 655 placed in a suitable oven ,and baked *Since and the main cylinder 52 has Vanannul-ar r'ib 53 which fits freely in counterbore 51. Cyl-vr inder 52 has an opening 54Y of'uniforin diameter all the way through.. A ring 56.1its freely in opening 54 and has a central opening shaped `tossuit thewinding head `15, and

an inwardly'turned annular'rib 57 whichffitsV intothe groove 18V of thecommutator,.and in order to be enabled to remove the collar 56 after the larmature has been insulated it is separable as at 58 into three parts. `The core 12 rests on the upperedgeof ring 56 and it is in this manner that the core and commutator are held positively spaced apart while the process of insulating the armature is taking place. Y

Theplunger 59 has a central opening 61 to lit freely'over sleeve 11 and is hollowed out at its lower end to go over the winding head 14. The lower end otplunger 59 ultimately.

rests'on the core 12 whereupon the upper'end comes flush with the top of cylinder 52 as shown. The tapped opening 62 is placed so as to come over one of the winding slots of the armature core. Opening 62 may be used as afvent to permit the escape of excess liquid when'the plunger59 is being :pressed Ydownir into place, and it -may be left open when baking the structure to permit .the escape of gases generated by `the heat of baking.

Inoperation the plate 48 is laid over .the collar 27- ot base 26 with ithe length Yof the plates at right angles to each other see Fig. 1) The armature lO'is then put upright with the commutator 13 inserted inthe opening 38,

the spacers 46 extending into the spaces 28.`

The three kpart ring Y56 is now put around head 15 and the maincylinder .52 `is putover the ring with the rib'53 in the counterbore 51. A measured quantity oi thel fluid insulation is nowpoured into the Ytop of cylinder 52 and the plunger 59 is inserted and pressed downward in asuitable press tothe position shown.

After the liquid insulation has been injected -into the mold as described Ythey liquid must be converted into a Vsolid .and the process necessary torso converting itdepends on the nature of. the liquid being used. Most of the commercial insulating varnishes are susceptible of being converted into a solid by the application of heat-,and where this kind of insulation is employed the entire structure comprising .the mold and its contents may be the mold is transferred from the press to an oven, suitable clamping means not shown for holding the mold parts together while baking is taking place must be provided.

When the insulation is sufficiently hard the armature isremovedfromthemold. Since the rectangular base, 26 and the rectangularplate 48 of themold .are assembled with th-eirlongest dimensions at right angles one to the other, each projects over the other (see Fig. 1) in -suchamannerthat the plate 48 may be readily held Vwhile the base 26 is pushed oft' of 'themold pullingthe spacers 46 of themold a from Athe spaces .230i the commutator. The plate 48 may then betaken oii' easily since it is'fitted freely tothe rib 53 anddoes notmake contact with any other member. tune together with the plunger-59 andthe ring 56-are now pushed endwise from 'the cylinder- 52. The plunger 59 and-the collar 56 may tion at a time, whereupon the armature will be insulated.`

Having described a kmold embodying my invention,I claim-f- Y f 1. Ina mold `for insulating an armature, thecombination of an oblong base having 'a collar extending upwardly from its upper surface, said collarhaving an internal di# ameter Aadapted to 'receivel the commutator, an oblong plate having an opening itting freelyv over said collar, said base and said plate being assembled with vtheir longest ydimensions the one at right rangles to theother, a cvlinder supportedjon said plate concentric with said collar, airing fitted yinthe lowerend of said cylinder having a central opening shaped to the front windinghead anda plunger fitted in the upper-end of saidcylinder having a central opening Winding head.' l y 2. For insulating an armature comprising a core,va winding-on saidcore, and acommutator axially spaced apart from said core, said co-mmutator having an annular groove extending around its outer diameter between the lactive portionwof the commutator and the risers, a mold comprising, in combinationa base portion to contain the active `portion of the commutator, a main cylinder 4extending upwardly from said base portion, said main cylinder having an -internal diameter equal to the outside diameter of said armature core, a ring slidably fitted to the lower end'of said main cylinder, said ring having an axial length equal to the distance from the armature core to the active portion of the said commutator and an annulus at its lower end fitted to the annular groovein said commutator,said ring being composed lof a number of separate segments, and a plunger,

having its lower end hollowed out to `suit the'- The armanow-bev removed, the collarradially one sec-I shaped 'toy-the, back mall).

3. For insulating an armature comprising a core, a winding on said core, and a commutator axially spaced apart from said core, said commutator having open spaces between the segments at the active surface, a mold having a lower section to receive the active portion of said commutator, said lower section comprising in combination, sheet metal spacers equalin number, in spacing and in thickness to said open spaces in said commutator but wider and longer and having outwardly extending L ends at the bottom, a stepped member having a cylindrical upper portion of two outside diameters, the smaller outside diameter at the top, and two inside diameters, the larger inside diameter at the top, said larger inside diameter corresponding to the outside diameter of the commutator, said cylindrical upper portion having slots to receive said L shaped sheet metal spacers, said slots completely containing said L shaped spacers except where they extend radially inward into said inside upper diameter of said cylindrical upper portion, a base portion having two inside diameters to fit over the two said out-side diameters of lsaid cylindrical upper portion, and a plug to fit the smaller of the two said inside diameters. f In testimony whereof I atlix my signature.

VINCENT G. APPLE.

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