US813523A - Brush-holder for motors or generators. - Google Patents

Description

PAT'EYNTE'D' PEBL'Z'], 1'906.

I F. L. SESSIONS. BRUSH HOLDER FOR MOTORS 0R GENERATOR:-

APPLIOATION FILED KAY 20. i903.

" iflinesses- UNITED v STATES PATENT OFFICE.

FRANK L. SESSIONS, OF COLUMBUS, OHIO, ASSIG-NOR IO JOSEPH A. JEFFREY, OF COLUMBUS, OHIO.

Specification of Letters Patent.

Patented Feb. 27,1906.

Application filed May 20,1903. Serial No. 157,980.

To all whom it may concern:

Be it known that I, FRANK L. SESSIONS, a citizen of the United States, residing at C0- lumbus, in the county of Franklin and State 'of Ohio,-have invented certain new and useful Improvements in Brush-Holders for Motors or Generators, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in the devices for holding and feeding the car bon brushesv of the sort commonly used in connection with the commutators of electric motors and dynamos.

The object: of the invention is to provide a nwcl'iai'iism which will be of the simplest possible form and with its parts compactly arranged and forming a unitary structure which can be readily put in place in restricted. s )aces, such as the commutator-chamber in the inclosed or box-like motors.

Figure 1 is a side elevation of abox-motor with a portion broken away, showing a bru sh holdermechanism sufficient to illustrate the manner of applying my im rovements. Fig. 2 is a side view of a rushholdcr. Fig. 3 is a front view. Fig. 4 shows one of the clamping-pieces of the brush detached and in topplan, side elevation, and rear elevation. 'Fig. 5 illustrates detached the outer part of the follower that advances the brush, showing it in rear elevation, side elevation, and end view. Fig. 6is a detail v'imvof the insulating contact-piece carried by the follower. Fig. 7 is an'enlar ged sectional view of a portion of theinsulating supportingblock for the brush-holder. Fig. '8 is a face view of the plate employed in securing the insulating-block in place. Fi 9 illus trates the bedplate H detached, 3 owing it in side elevation, end view, and top plan. Fig. 10 is a plan view of the base-plate that rests upon the bed-plate, the legs that rise from the base-plate being in section. Fig." 11 is a to plan view of the contact-plate P.

In the drawings I have illustrated more or less of a box-motor-that is to say, a motor of the class in whichthe armature and commutator are inclosed in two field-sections.

field-sections at B, and the other at B. The armature-shaft a is mounted in bearingsC C. The bearing C extends inward somewhat, as shown at c, from the wall I) at the end of the motor.

1) indicates the commutator, which is positioned between the end of the armature and the bearing C.

E is a comparatively large block of insulating material, preferably wood. It is formed with a recess or countersink E upon its inner side. In this there is fitted a metallic plate F.

G represents the fastening-bolts which extend through apertures ate in the block and engage with the metallic nut-plate F, these Earts serving to firmly bind the insulatingase to the inner side of the wall I) of the mo tor. After the metallic plate F has been inserted into the recess E the recess may be filled up or closed by means of insulating material, as indicated at E so that all of the surfaces of the insulating-block within the motor-casing will be of insulating material.

H is a bed late secured to the insulating- 7 block E. It 1s formed with guide-ribs h and stops at h. The part that sustains the brushhas a bottom plate I, which is fitted in the guide-plate h, this plate I having a slot at '6, through which passes the clamping-bolt J, the latter serving to fasten the plate I in the desired position of adjustment.

The brush is indicated by K. It is held in the box L, supported upon legs M, integral with and rising from the base-plate I. The brush is at its rear or outer end connected to the flexible conductor N, the ends of the latter being respectivelysecured in clampingpieces 0 0, each of these having a clampingplate, as shown at 0, and a side plate, as

shown ate, with an'aperture for the end of the conductor N. This clamp is formed in two parts in order to provide for the insertion of the brush within it and the efiiciency of the clamping action when the two parts are drawn together upon the brush. This drawing of the two parts together and clamping of the brush between them is accomplished by means of a bolt 0 which extends upward through the plate 0 at the lower side of the 50 i The armature is shown at A, one of the 1 brush K and through the brush, and is screwed into the threaded aperture in the plate 0 of the upper part of the clamp. It will be seen that the clamping of the brush between the plates is obtained by adjusting the bolt 0 This latter may be quickly removed when it is desired to remove the brush. The conductor X is secured to a con tact-plate P, slotted at 'p. The latter is rig idly fastened to the binding-lug Q, which is situated above the carbon and is preferably formed integral with the brush box L.

R is a binding-screw passing through the slot y) in the plate, and R is a jam-nut adapted to clamp the plate P tightly against the lug Q. The lug is providedwith an aperture (1, into which is fitted the end of the lead-wire S.

It will be seen that the conductor N connects both parts of the clamp into the electrical circuit from the brush, so as to insure a good and suf'licient electrical connection between the brush-clamp and the binding-post.

The carbon brush K is advanced through the box by means of a. spring-held follower T The latter is made in two parts t and i. The part .t is pivoted at U to the legshf, and .the two parts 1% t are pivoted together at V.

W is a'spring connected to the follower and to a stationary holderas, for instance, a pin or bar on the legs M-and tending to draw the outer end of the follower toward and against the forward end of the carbon brush.

t is a handle on the lower part t of the follower and by means of it the follower can be.

drawn back at anytime'ars, for instance, when it is desired to withdraw the carbon and insert another or for other purpose.

The upper part 23 of the follower is free to move in one direction around the pivot V, but by means of a shoulder or lug at t is stopped against movement in the opposite direction beyond a predetermined limit. To the upper end of tlns part t" there is secured a piece of insulatingmaterial T as, for instance, a small piece of lava. The end of the follower-arm is preferably formed with a cav,

I ity, as shown at t, and the insulation has a cylindrical or other suitable form to fit this cavity It can be fastened in place if it be provided with notches or recesses, as at i, into which the metal at the ends of the cavity t can be bent.

that I claim ise 1. The combination with the brush-hold er and the brush, of the pivoted spring-held folbelow the brush-box and formed in two parts, the outer part being connected to the inner by a pivot and having its outer end adapted to move around the said pivot in one direction and locked against movement in the other direction when bearing against the brush, substantially as set forth.

3. The combination with the brush-holder and the brush, of the pivoted spring-held follower formed in two parts, the lower part being secured by a statlonary pivot and having a handle, and the upper part being secured to the lower part by a pivot and locked against movement around saidpivot when bearing against the brush, substantially as set forth.

4. The crnnbination with the brushholder,

the brush, the lead-\\-'ire-binding lug adjacent 7. The combination of the brush movable bodily toward the commutator, means for forcing the brush toward the commutator, a

brush-holder formed of two parts, and a means for causing them both to tightly clamp the brush, flexible conductors, one connected with each of the clamping parts of the brushholder, and acontact-plate to which both the said conductors are connected, substantially as set forth.

8. In a box-motor, the combination with the armature, the commutator and'the inclosing field-sections having the closed end walls sup porting the armature-shaft, the bcaring for the shaft projecting inwardly from the closing wall, the insulator arranged to overlap the said bearing and secured from-the exterior to the said closing wall, the bodily stationary brush-holder adjustably secured to the said insulator, and the spring-held followeradapted to bear againstthe brush in the holder, substantially as set forth.

- '9. The combination with the brush-holder and thebrush, of the suing-held follower bearing against the brush and having at its end adjacent to the brush a cavity in which is situated an insulator held in position by the bent-in end walls-of said cavity.

10; Thecombination with the brushholder, the brush and the spring-held follower bearing against the brush, of the piece of in- I sulating Inaterial T hafing the notohesrf in I In testimony whereof I affix my signature its ends, the upper end of the said follower in presence of two witnesses.

having a cavity t into which the said piece of Y insulating material is fitted and the end -Walls F K SESSIONS of which are bent into the notches t of said Witnesses: piece. of insulating material to fasten it in LILLIAN BLACKMORE', place. E. F. ABRAM.

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