US1370277A - Electric-brush holder - Google Patents

Description

E. BUE'ROSSE.

ELECTRIC BRUSH HOLDER.

APPUCATION fiLED Nov. 8, 1920.

1,370,277 Patend Mar. 1,1921.

I N VEN TOR'.'

MMM

ATTORNEYS.

UNITED STATES PATENT OFFICE.` t

ERNEST BUEBOSSE, `F MILWAUKEE, WISCONSIN, ASSIGNOR 0F ONE-THIRD TO GEORGE BUEROSSE AND ONE-THIRD T0 GEORGE J'. BUEROSSE, BOTH 0E MIL- WAUKEE, WISCONSIN.

' Speceation of Letters Patent.

ELECTRIC-BRUSH HOLDER.

Patented Mar. 1, 1921.

Application led November 8, 1920. Serial No. 422,495.

specification, reference being had to the accompanying drawing, forming a part thereof.

This invention relates to brush holders for various types of electric generators and motors.

Its main objects are to automatically effect and maintain uniform and true contact between the working faces of brushes and the commutators or collector rings; to prevent the brushes from shifting sidewise and to maintain them in proper'position relative to the commutators or collector rings without interfering with their free rocking movement sidewise and maintaining true contact with the commutators or.y collector rings; to avoid unequal and undue wear of the brushes and of the commutators or rings withwhich they engage; and generally to improve the construction and operation of electric brush holders.

It consists in `the construction, arrangement and combination of parts as hereinafter particularly described and pointed out in the claims.

In the accompanying drawing like characters designate the same' parts in the several figures.

Figure 1 is a side elevation of a brush holder embodying the invention in connection with the commutator or rotary contact member of an electric machine and a brush supporting yoke; Fig. 2 is an enlarged view partlyv in side elevation and partly in section of the brush holder, the section cutting the floating block or head of the holder on the line 3-3, F ig. 4; Fig. 3 is a plan viewV of the brush holder with a ortion of the brush supporting yoke; and iig. 4 is a cross section of the brush holder showlng the floating block or head and a brush attachedy thereto in elevation as viewed from the left relative to Figs. 2 and 3.

Referring to Figs. 1 and 3, a desi nates a commutator, collector or rotary e ectric contact member of an electric machine, and b a brush supporting yoke angularly adjustable coaXially with the commutator and provided with transverse studs c, preferably adjustable toward and from the axis of the commutator.

The brush holder constituting the present lnventlon comprises a relatively stationary block or head 1, Vand a floating brush supporting block or head 2, preferably made of' electric conducting material such as copper orbrass.

As shown vin Figs. 2, 3 and 4, the blocks or heads l and 2 are formed with alined counterbored holes 4, in which the ends of closely coiled parallel helical springs 5 are seated, and are fastened by screws 6, engaging the convolutions 'of the springs adjacent their ends.

The springs form an elastic or resilient connection between the blocks or heads 1 and 2, which permits the floating block 2 to rock or tilt sidewise and to yield lengthwise in a direction approximately radial to the commutator or rotary contact member a of the electric machine with which the brush holder is used. v

A carbon block or brush 8 is fastened to the floating block or head 2 in any suitable manner, for example as shown, by a screw 9, passing through a hole in thebrush and threaded in the block 2.

The block or head 1 is formed or provided with a clamping collar 11, or other suitable means for adjustably mounting it on a yoke stud c.

One of the blocks or heads, preferably the fioating block or head 2, is formed on the inner side facing the block 1, with a longitudinal guiding groove 13, and a guide rod 14:, loosely engaging at one end with said groove, is fastened at the other end to the other block. This guide rod, while it permits the block or head 2 to rock sidewise so as to maintain true contact between the brush 8 and the commutator or rotary contact member a and to move lengthwise in a radial direction relative to the commutator, prevents its shifting bodily' sidewise and maintains it in proper working position on the commutator. It also serves as a strut to prevent the brush from being shifted out of place toward the block or head 1 by the rotation of the commutator in the direction indicated by the arrow on Fig. 1.

The blocks 1 and 2 are preferably connected by a'fiexible electric conductor 16, to carry the current between the brush S and stud c independently of the springs 5.

The brush supporting stud c is adjusted on the yoke and the brush holder is adj usted on the stud? so that the brush S Will stand radially relative to the commutator or rotary contact member e, as shown in ig. l, in proper position `to engage with its peripheral Working face, and the springs 5 Will be flexed sul'liciently to maintain a. lightly yielding contact between the brush and commutator, and prevent sparking.

In the 'operation of the brush holder, the brush adjusts itselic automatically to maintain uniform and effective electric contact betiveen the entire areav oi' its Working face and the opposing Working Jrace of the commutator or rotary electric contact member. The pressure of the outwardly' flexed springs 5 being evenly distributed over the Working lace or the brush, causes it and the Working]T face of the commutator or rotary Contact member to Wear evenly, the brush rocking` freely sideivise and yielding radially to compensate or any irregularities and ccentricity in the Working fare or the commutator or rotary contact member.

rhe blocks or heads l and 2 may be connected by one or more springs 5 arranged substantially as shown, to permit the required movements ot' the brush S and to maintain it in proper position relative to the commutator or rotary contact member e.

Various modifications in the details ot' construction and arrangement of parts oi the brush holder and in the mounting; ol1 the same, may be made, Without departure 'lroin the principle and scope of the invention as defined in the following claims.

I claim:

l. ln an electric brush holder the combination ot a stationary head, a tloati brush-supporting head, and num er ot substantially parallel springs connecting;` the heads with each other.

ln an electric brush holder the combi nation of a relatively stationary heath a iioating brush-supporting head, and sub stantially parallel helical springs connecting' the heads with each other.

In an electric brush holder the combination of a relatively stationary head, a floatingy brush supporting head, an elastic connection between the heads permitting` a sideivise rocking` movement of the floating head and yielding movement thereof in a radial direction relative to the rotary contact member with which the brush engages.

4. In an electric brusn holder the combination of a stationary head.l a floatingr brushvsupporting head, an elastic connection betion the other end with the other head, which is niiovable thereon tovmvd and from the rotary contact member ".vith which the brush engages.

5. ln an ele: ie brush holder the combi nation ci sta E, and floating' heads formed with :dined countcrsunlr holes, a S0 helical spring); seated in said holes.y and screws engaging' the coii'v'olutions ot the springs adjacent their ends and securing: teem in the heads.

7. ln an electric brush holder the combi a5 nation of? a relatively stationary head pro vided "ith clamping; collar ior aneularlv adjustable mounting' on a brush-supporti, stud. a floating brush-Supporting heath and a. spring' connecting' the heads with each (itllel.

8. ln an electric c nation of stationary ant. floating electriiconductor heads, .iieans 1 s electric brush to the float' spring' and Flexible. electric conduc nections bet-Ween said heads,

5l. In combination vvith a rotary ele L contact member and :i brush-supportine' parallel 'with and adir ble toward and from the artis of the rotaijv n'ieinbilr. a brush holder comprisingr a relatively stationary head provided 'with a clamping collar fior anrularly adjustable n'iountingij on said stud, 'flea tingr head provided with niea'ns lor las lening' a brush thereto. and, parallel sprintf? tonnectingrl said heat y ith each other.

l0. An electric brush holder compri a relativelyT stationary headA lloatinghri supportine` head havin e' lone-itudinal fr i ing 2groove in the side toward the other head` parallel springs fastened at the ends to air-l connecting said heads. and a strut an (ruido rod fastened at. one end to the stationarj.' head and engaging at the other end with the `groove in the Heating: head.

.ln ivitness whereof l hereto ailix my sienature.

d. and.

con- ERNEST BUEROSSE.

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