US590466A - Commutator and means for assembling same - Google Patents

Description

(No Model.) I

S. H. SHORT.

GOMMUTATOR AND MEANS FOR ASSEMBLING SAME.

Patented Sept. 21,1897.

E 15 If]? UNTTED STATES PATENT OFFICE.

SIDNEY HONE SHORT, OF CLEVELAND, OHIO.

COMMUTATOR AND MEANS FOR ASSEMBLING SAME.

SPECIFICATION forming part of Letters Patent No. 590,466, dated September 21, 1897.

Application filed JulylZ, 1897. smart. 644,226. (Nomodeld T (1. whom, it may concern:

Be it known that I, SIDNEY'IIOWE SHORT, a citizen of the United States, residing at Cleveland, in the county of Ouyahoga and State of Ohio, have invented new and useful Oommutators and Means for Assembling the Same, of which the following is a specification.

This invention relates to commutators and means for assembling the same.

The object of the invention is to provide a construction and arrangement wherein the commutator-bars are efficiently assembled and supported and wherein a true and cylindrical external surface of the commutator is maintained.

The invention consists, substanliall y, in the construction, combination, location, and relative arrangement, all as will be more fully hereinafter set forth, as shown in the accompanying drawings, and finally as specifically pointed out in the appended claims.

Referring to the accompanying drawings and to the various views and reference-signs appearing thereon, Figure 1 is a central longitudinal sectional view of a commutator constructed and arranged in accordance with the principles of my invention. Fig. 2 is an end view of the same, partly in transverse section. Fig. 3 is a detached broken detail view in plan of the inner supporting-ring and overlapping insulating-ring.

The same part is designated by the same reference-sign wherever it occurs throughout the several views.

In the drawings reference-sign A designates the armature shaft, upon which is mounted the commutator hub or spider. This hub or spider may be of any suitable or desirable construction and arrangement adapting it as a support for the commutator-bars C. These bars are assembled into ring form in any suitable or convenient manner-for instance, as set forth in my pending application, Serial No. 633,879, filed April 26, 1897- with the interposed insulating-strips I), and the cylinder thus formed is slipped upon the peripheral portion of the supportinghub The commutator end insulation E, suitably shaped to conform to the contour of the ends of the commutator-bars, is then arranged in place and clamped upon the ends of the bars there can be no high bars.

by the commutator-heads F by means of bolts G.

In the construction of commutators it is ex ceedingly important that the commutatorbars and the mica insulation between them be assembled into a cylindrical form and pressure applied to the outside of the cylindrical body, so as to force the commutator-bars and the mica together with a very great peripheral pressure, and while under this great peripheral pressure the commutator should be heated, so that any extra varnish in the mica segments may be displaced, and as it flows out from between the plates of mica additional pressure may be applied so as to force the bars against the mica plates solidly. I11 order to accomplish this, there must be nothing on the inner portion of the commutatorcylinder to prevent the bars from traveling inward under the external pressure which is being applied. WVhile the bars are held in this position, the mounting must be applied in. such a Way as to clamp them firmly in the position attained while they are on the assembling-jig. It is also necessary after clamping the commutator-cylinder onto its hub by means of the end rings to provide a support or supports inside of the cylinder formed by the commutator-bars and mica, so that the individual bars cannot move inwardly and produce what is known as low bars. The commutator end rings will of course prevent the bars from moving outwardly and therefore Even after the commutator is completely assembled there should still remain the circumferential pressplitting these rings diagonallyI am enabled to compress them to a point where they may ,be radially inserted'in the oommutator-cyh inder. A strip or ring of insulation I\', also preferably split diagonally, is interposed between the holding or supporting ring if and the inner surface of the commutator-eylin der. By splitting the insulation-rings K diagonally, as shown at L, Fig. 3, I am enabled to readily compress said rin to a point where they can be easily and readily inserted in the commutator-eylinder. In practice the diagonal slot I; through the insulating ring If is normallyof smaller extent than the diagonal slot J in the holder-ring II when in its normal condition, as shown in Fig. 0. Therefore an efficient bearing of the insulationring against the inner surface of the commutator-bars and the point where the diagonal slot occurs is constantly maintained and good surface insulation secured.

In order to secure the desired results, it is important to provide means for suitably expanding the holder-rings II after being placed in position within the commutator-ring and after the commutator cylinder has been placed in position uponits supporting spider or hub. It is also important that such expansion take place uniformly throughout the length of said holder-rings in order that the commutater-cylinder may be held in truly concentric and peripheral cylindric relation with respect to the axis of the armature A. To this end the spider or hub 13 is peripherally flanged, as at M, through which at suitable intervals are tapped radially set-screws N, having their ends arranged to abut against the inner surface of the holder-rings II. After the eommutator-cylinder, with the holderrings arranged in place therein, is placed in position on the hub or spider by suitably and successively turning up on the setnuts N the holder-rings are expanded against the inner surface of the commutator cylinder, thus forming an efficient support for the commie tator-c'ylindcr, holding the connnutaior-bars in proper relation, preventing the individual bars from being driven in, thus disturbing the true cylindrical external surface of the commutator and enabling the commutator to be rapidly and easily assembled in proper position upon its supporting-hub.

In order that the holderrings II may not interfere with the clamping-bolts (l, by w hieh the head-plates F are clamped upon the ends of the commutator-cylinder, I provide seats or recesses l in the peripheral surface of the flanges M, in which said clamping-bolts are received below the surface of such flanges, as clearly shown in Fig. 2, thereby enabling the commutator-cylindcr, with the holder-rings, to be readily and easily slipped thereover.

It is desirable to provide means for holding the sct-scrcws N against relative turning after they are once properly adjusted. As

illustrative of simple and e'fiicient means for accomplishing this object I have shown holes or perforations It, drilled through the heads of said screws, through which I pass holding wires or rods S. In practice it is sufficient l i t l l 1 that two m'ljaeent set-screws be thus locked i together.

llaviug now setforth the object and nature of my invention and a form of apparatus em bodying the same and having described the construction, function, and mode of operation thereof, what I claim as new and useful and of my own invention, and desire to secure by Letters Patent of the United States, is

.i. In a commutator, the combination with a hub or spider, a commutator cylinder mounted thereon, and an expansiblo .ringin terposed between said connnutator-cylinder and said hub, as and for the purpose set forth.

2. In a-commutator, a hub or spider, a commutatorcylinder mounted thereon, a split ring interposed between said commutator cylinder and said hub or spider, and means for expanding said split ring, as and for the purpose set forth.

3. In a commutator, a hub or spider, a coinmutater-cylinder mounted thereon, a split ring interposed bet-ween said hub or spider and said connnutator-cylinder, andset'serews passed through said hub or spider and impinging against said split ring, as and for the purpose set forth.

l. In a commutator, a hub or spider, a commutator-cylinder mounted thereon, a dingo nally-split ring interposed between the hub and the comnuitator-cylinder and a diagonally-split ring of insulation interposed be tween the split ring and the commutator-eylinder, as and for the purpose set forth.

5. The combination with a hub or spider and a commutator-cylinder, of a diagonallysplit holder-ring and a diagonally-split insulation-ring, the slot in the insulation-ring be ing of smaller extent than that through the holder-ring, as and for the purpose setforth.

(3. The combination with a hub or spider having a grooved periphery, of a eomniutatorcylinder mounted thereon, clamping-heads for said cylinder and securing-bolts for said heads, said bolts arranged to be received in the grooves in said periphery, as and for the purpose set forth.

7. The combination with ahub or spider, having grooves in its outer periphery, of a commutator cylinder mounted thereon, clamping-heads for said cylinder, SCGUL'iIIg bolts for said heads, said bolts arranged in said grooves, and a holder-ring interposed between said hub or spider and eonunutatow cylinder, as and for the purpose set forth.

8. In a commutator, a coinmutator-cyliuder, a supporting-hub therefor, said hub provided with a peripheral flange and an expansive ring interposed between the outer surface of said peripheral flange and the inner surface of said coinmutator-cylinder, as and for the purpose set forth.

9. In a con'imutator, a counnutator-cylinder, a peripherally-ilanged supporting-hub therefor, an expansive ring interposed between said fiangc and commutator-cylinder, set-screws tapped through said flange and IIO impinging against the inner surface of said split ring, as and for the purpose set forth.

10. In a commutator, a 00mmutator-oylinder, a peripherally-flanged supporting-hub therefor, an expansive ring interposed between said flange and eoininutator-eyiinder,

set-screws tapped through said flange and impinging" against the inner surface of said split ring, and means forloeking said set-nuts

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