US466972A - Brush-holder for commutators for dynamo-electric machines - Google Patents

Description

(No Model.)

I. H BARTHOLOMEW. BRUSH HOLDER FOR GOMMUTATORS FOR DYNAMO ELECTRIC MAGHINBS.

No. 466,972. Patented Jan. 12, 1892.

THE NORRIS versus (20., momuma, WASNINEYHN, u. c

UN TED STATES PATENT OFFICE.

ISAAC H. BARTHOLOMEV, OF NORTHFORD, CONNECTICUT.

BRUSH-HOLDER FOR COMMUTATORS FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 466,972, dated January 12, 1892.

Application an August 13,1891. Serial No. 402,531. (No model.)

To all whom it may concern:

Be it known that I, ISAAC H. BARTHOLO- MEW, of Northford, in the county of New Haven and State of Connecticut, have invented anew Improvement in Brush-Holders for Com mutators forDynamo-Electric Machines; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in

Figure 1, aview in side elevation of abrushholder constructed in accordance with my invention with the brush shown in its normal or operating position; Fig. 2, a broken view of the device, which is shown partly in elevation and partly in section, with the brushcarrier elevated to retire the brush; Fig. 3, a

g evice in transverse section on the line as a: of

My invention relates to an improvement in holders for commutator-brushes for dynamoelectric machines, the object being to produce a simple and convenient device adapted to be operated without the removal of any of its parts or the use of tools and to be adjusted to compensate the brushes for wear.

\Vith these ends in View my invention consists in the combination, with a frame-piece,

of a brush-carrier pivotally connected therewith and a movable hand-piece located between the said parts for lifting the former to retire the brush.

My invention further consists in the combination, with a frame-piece, of a slide applied thereto, a brush-carrier connected with the said slide, and an adj 'llStlllg-SOIGW mounted in the frame-piece and connected with the slide for moving the same and hence the brushcarrier.

My invention further consists in certain detailsof construction and combinations of parts, as will be hereinafter described, and pointed out in the claims.

As herein shown, the frame-piece A of the device is cast in one piece of metal and constructed at its forward end with an opening B for the shaft upon which the device is mounted, the said shaft not being shown plan view of the device; Fig. 4, a view of the heroin. .An arm A, formed at the forward end of the frame-piece, is constructed with a longitudinal threaded perforation to receive a set-screw B, which enters the opening B aforesaid to engage with the shaft and thus secure the device thereto. The said framepiece is also constructed with two parallel depending lugs C C, having aligned perforations. said frame-piece between the two depending lugs C C thereof, is provided with a depend ing lug D, having a threaded perforation in line with the perforations of the said lugs before mentioned. An adj ustingscrew E, having a knurled head, passes through each of the said lugs, and is secured against endwise displacement by the said head and by a pin E, passing transversely through its extreme inner end. By means of this screw the slide D may be moved back and forth between the two depending lugs C C, which are thereto sufficiently separated to give the slide as much play as will ever be called for in the operation of the device. The two ends of the yokeshaped body of the slide extend above the fiat upper face of the frame-piece and receive between them the curved arm F of the brushcarrier, the said arm being constructed at its rear end with a horizontally-perforated knuckle F, receiving a pin C, which also passes through the said ends of the yokeshaped body of the slide, whereby the brush carrrier is pivotally connected therewith. A horizontal box 'I-I, located at the inner end of the arm F and cast in the same piece therewith, is constructed with a narrow opening H, extending throughit in line with the said arm and conforming to the cross-section of the brush 1, which is composed of a series of thin flexible strips of sheet metal placed one upon the other, the said brush being secured in place in the box by means of a thumb-screw J, mounted in the upper Wall thereof and entering the opening therein, so as to engage with the brush, which may be longitudinally adjusted by loosening it.

A movable hand-piece K, resting upon the flat upper face of the framepiece A, is interposed between the same and the arm F of the brush-carrier and constructed at its inner end with a lifting-finger K, which co-operates A yoke-shaped slide D, applied to the ICO with a cam-face F formed upon the inner face of the said arm F, in lifting the arm into the position shown by Fig. 2 of the drawings, in which the brush is retired, or, in other words, cleared from engagement with the commutator, which is not shown. A shoulderK formed upon the lower edge of the hand-piece, near the outer end thereof, is provided for engagement with the outer end of the frame-piece A, whereby the said handpiece is prevented from being pushed too far inward. At its extreme outer end the hand piece is flattened and turned down, as at K to enable it to be more readily grasped for manipulation. The end of the lifting-finger K of the hand-piece has a flat face to co-opcrate with a corresponding face F formed just in front of the knuckle F of the arm F of the brush-carrier, as will be hereinafter described. A coiled spring L connects the forward end of the box H with the slide D and exerts a constant tendency to hold the brushcarrier in its normal position, as shown by Fig. 1 of the drawings.

In using a brush-holder constructed in accordance with my invention it is first set in the usual manner, after which the brushes are moved toward or away from the comm utator, as required, by means of the adjustingscrew, which enables this operation to be very easily and very delicately performed and the brush set to secure the very best results. This screw enables the adj ustment of the brushes to be effected much more evenly and accurately than can be done by loosening the thumb-screw J and moving the brushes longitudinally in the box of the brush-carrier by hand. IVhen itis desired to retire the brushes, or, in other words, to clear them from engagement with the commutator, the hand-piece is seized by its outer end and pulled back, whereby the brush-carrier is lifted against the tension of the spring L into the position shown by Fig. 2 of the drawings, in which it is sustained by the engagement of the flat edge of the lifting-finger K of the hand-piece with the fiat face F formed just in front of the knuckle F of the arm F of the box of the brush-carrier. IVhen it is desired to re-engage the brushes with the commutator, the hand-piece is pushed inward, permitting the spring L to act in pulling the brush-carrier down, and so engaging the brushes with the commutator. The described operation of the hand-piece does not effect the adjustment of the parts and enables the brushes to be retired and brought into operative position very conveniently.

I would have it understood that I do not limit myself to the exact construction shown and described, but hold myself at liberty to make such departures therefrom as fairly fall Within the spirit and scope of my invention. I am not, for instance, obliged to use the slide and the adjusting'screw in conjunction with the sliding hand-piece, but may use either or both of the said features.

I-Iavingfully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a holder for the commutator-brushes of dynamo-electrical machines, the combination, with a frame-piece, of a brush-carrier pivotally connected therewith, and a handpiece located between the brush-carrier and the frame-piece for lifting the former to retire the brush, substantially as set forth.

2. In a brush holder for commutatorbrushes for dynamo electric machines, the combination, with a frame-piece, of a brushcarrier pivotally connected therewith, and a sliding hand-piece resting upon the framepiece and interposed between the same and the ln'ush-carrier and constructed at its for-- Ward end with a lifting-finger, substantially as set forth.

3. In a holder for commutator-brushes for dynamo-electric. machines, the combination, with a frame-piece, of a slide applied thereto, a brush-carrier connected with the said slide, and an adjusting-screw mounted in the framepiece and connected with the slide for moving the same, and hence the brush-carrier, substantially as set forth.

4. In a holder for commutatorbrushes for dynamo-electric machines, the combination, with a frame-piece having an opening to receive a shaft, and two depending parallel lugs having aligned perforations, of a yoke-shaped slide located between the said lugs and having a depending lug constructed with a threaded perforation, an adjusting screw passing through the said lugs, a brush-carrier pivoted to the said slide, a sliding hand-piece located between the frame-piece and brushcarrier and having a lifting-finger at its inner end, and a spring for pulling the brush-carrier toward the frame-piece, substantially as set forth.

5. In a holder for commutator-brushes for dynamo-electric machines, the combination, with a frame-piece, of a brush-carrier pivotally connected therewith and having a camface and a flat face located in rear of the same, and a sliding hand-piece located between the ln'ush-carrier and the frame-piece for lifting the former to retire the brush and constructed at its forward end with a liftingfinger, which co-operates with the said cam and flat faces, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

ISAAC II. BARIIIOLOME\V.

IVitnesses:

C. E. SMITH, G. A. SMITH.

IIO

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