US507344A - Commutator-brush holder - Google Patents

Commutator-brush holder Download PDF

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Publication number
US507344A
US507344A US507344DA US507344A US 507344 A US507344 A US 507344A US 507344D A US507344D A US 507344DA US 507344 A US507344 A US 507344A
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Prior art keywords
stud
brush
socket
piece
boss
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/38—Brush holders
    • H01R39/39—Brush holders wherein the brush is fixedly mounted in the holder

Definitions

  • This invention introduces certain improvements in the construction of holders for the copper brushes of the commutators or collectors of dynamo electric machines.
  • Figure 1 is afront elevation
  • Fig. 2 an end elevation of the brush holder and brushes as applied to the supporting stud.
  • Fig. 3 is a section of the brush holder removed from the stud, the section being cut on the lines 3-3 in Fig. 1.
  • Fig. 4 is a section on the line 4-4 in Fig. 2.
  • Fig. 5 shows the side and end of the socket-piece, and
  • Fig. 6 shows the boss or set-piece in plan and side view.
  • Fig. 7 shows the copper sleeve.
  • Figs. 1 and 4 designate a portion of the cylindrical surface of the commutator
  • b in Figs. 1, 2 and 4 designate the stud upon which the commutator brush holder is supported, this stud being itself supported upon the dynamo in any suitable way.
  • the brush holder consists of a socket-piece C, shown separately in Fig. 5, a boss or setpiece D shown separately in Fig. 6, a gib E carrying a stiffening plate or spring e, a conducting sleeve F preferably of copper shown separaiely in Fig. 7, a spring S, and the requisite adj usting screws.
  • the gib is held from displacement by two pins h h (Fig. 2) passing freelythrough holes in the bridge.
  • the socket-piece is connected to the supporting stud in pivotal manner lby being formed with two perforated ears the openings in which slip over the stud, the sleeve F however intervening.
  • the boss or set-piece D consists of a tubular boss or hub adapted to slip over the stud, with the intervention however of the sleeve F, and formed with an arm D' having a threaded hole in which works the adj usting screw G.
  • This arm is preferably slitted to give it elasticity, and a screw j is provided for drawing its opposite parts together to clamp the adj usting screw with any desired amount of friction.
  • the boss D is also provided with a socket k for receiving one end of the spring S, which is firmly fastened therein by means of a screw.
  • the spring is a flat or leaf spring, and is bent around the hub portion of the boss, its opposite end being fastened or clamped by a screw Z to the socket-piece O.
  • This spring acts in such direction as to tend to press the tip of the brush away from the commutator, the brush being forced toward the commutator by the adj ustment of the screw G, the tip of which bears upon the socket-piece O underneath the seat d in the manner shown, so that by screwing the screw forward it presses the brush toward the commutator in opposition to the tension of the spring.
  • the boss D is held in place by means of a set-screw H entering through athreaded hole in the boss, and the end of which enters a recess in the'stud b, this reoess being preferably constructed as a longitudinal keyway, in order that the brush holder may be set in place at different points lengthwise of the stud, so as to bring the brush to any desired adj ustment against the face of the commutator.
  • the boss D is firmly united to the stud so as to resist the tension exerted against it by either the spring S 01- the screw G.
  • the boss D fits between the perforated ears i i of the socket-piece, as shown in Fig. 3, so that when the boss is set in position on the stud it holds the socketpiece against displacement longitudinally of the stud.
  • the metal sleeve F is introduced between the socket-piece and boss on the one hand and the stud on the other, and serves two purposes: first, it serves toimprove the electrical connection between the stud and the other parts of the brush-holder, since it afiords a IOO broad surface the contact of which with the stud is not materially impaired by the eccentric displacement of the boss D by the tightening of the screw H; and the second, it serves as a means for connecting together the socketpiece O and boss D in such manner as to pre- Vent their perforations being forced out of alignment by the tension of the spring S.
  • My present invention reverses the adj usting screw, causing it to work through the arm and bear against the socket-piece and constructs the arm not as an integral part of the stud, but as part of a boss or set-piece which is adjustably clamped upon the stud.
  • This construction simplifies the manufacture, and has the advantage of enabling the brush holder to be set to different positions along the stud, and to be removed without impairing the adjustlnent.
  • a laminated copper spring has served as the sole support of the brush socket, the socket-piece being not otherwise connected with the supporting stud or frame, or else when the socket-piece has been pivotally mounted on the stud, a steel spring has been introduced to exert a pressure upon the brush socket, being fastened to or reacting upon the stud.
  • the current is carried solely by the laminated copper spring, which consequently has to be fully as massive as the commutator brush.
  • the current is designed to be carried between the stud and brush through the socketpiece, but this would not be applicable for heavy currents, because any imperfections of electrical contact between the two, would cause a portion of the current to be diverted through the spring, so that the spring would be heated and its tension impaired.
  • the brush holder with a double or composite spring S, the same consisting of a steel spring to afford the necessary elasticity, and a laminated copper spring for conducting any current that might otherwise tend to pass between the boss and socket-piece through the steel spring.
  • the steel spring is lettered 8
  • the laminated copper Springs lettered s' the steel spring being preferably inside and the copper lamina extended around its exterior so as to bind ose against it.
  • the sleeve F is a simple piece of copper tube with a hole m through it to admit the end of the set-screw H.
  • This sleeve may be made either a loose or driving fit with the boss D, but must be a free or working fit with the ears z' z' of the socket-piece.
  • a modification retaining part of my invention would consist in omitting the sleeve F, and bringing the boss and socket-piece ears into direct contact, but this would be an inferior construction.
  • a commutator brush-holder consisting of a socket-piece having a pivotal bearing on said stud, and a boss having a screw for fixing it to said stud, and an adj usting screw working in said boss and acting against said socketpiece to rock it on said stud and adjust the brush against the commutator.
  • a commutator brush-holder consisting of a socket-piece having opposite perforated cars engaging the stud and forming a pivotal bearing thereon for the socket-piece, a boss detachably fixed on said stud between said ears whereby it prevents the longitudinal displacement of the socket-piece, and an adj usting screw working in said boss and aeting against said socket-piece to rock the latter on said stud and adjnst the brush against the commutator.
  • a commutator brush-holder consisting ol' a socket-piece having a pivotal bearing on said stud, a boss having a screw for fixing it to said stud, a spring fixed at one end to said boss and at the other to the socket-piece and tending to press the brush away from the commutator, and an adj usting screw working in said boss and acting against said socketpiece to rock it on the stud and press the brush against the commutator.
  • socket-piece pivoted on said sleeve, and an adjusting screw engaging said boss and socketpiece for adj usting the socket-piece relatively to the stud, whereby the holder may be removed bodily from the stud without impairing its adjustment.
  • a commutator brush-holder consisting of a socket-piece having a pivotal connection with the stud, a boss fixed to the stud, and a metal sleeve interposed between the stud and said socket-piece and boss, and serving to make an elfective electrical connection between the brush-holder and stud.
  • a commutator brush-holder consisting of a IIO In witness whereof I have hereunto signed my name in the presence of two subscribing Io Witnesses.

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  • Motor Or Generator Current Collectors (AREA)

Description

(No Madel.)
J J WOOD GOMMUTATOR BRUSH HOLDER.
No. I507,344. Patentd Oct. 24, 1893.
INVENTOR:
` By his' Atomeys,
UNITED STATES PATENT OFFICE.
JAMES J. WOOD, OF FORT WAYNE, INDIANA.
COMMUTATOR-BRUSH HOLDER.
SPECIFIGATION forming part of Letters Patent No. 507,344, dated October 24, 1893.
Application filed .Tune 27, 1893. Serial No. 478,964. (No model.)
'Z'o aZZ whom it may concern:
Be it known that I, JAMES J. WOOD, a citizen of the United States, residing at Fort Wayne, in the county of Allen and State of Indiana, have invented certain new and useful Improvements in Commutator- Brush Holders, of which the following is a specification.
This invention introduces certain improvements in the construction of holders for the copper brushes of the commutators or collectors of dynamo electric machines.
The accompanying drawings show the preferred construction.
Figure 1 is afront elevation, and Fig. 2 an end elevation of the brush holder and brushes as applied to the supporting stud. Fig. 3 is a section of the brush holder removed from the stud, the section being cut on the lines 3-3 in Fig. 1. Fig. 4 is a section on the line 4-4 in Fig. 2. Fig. 5 shows the side and end of the socket-piece, and Fig. 6 shows the boss or set-piece in plan and side view. Fig. 7 shows the copper sleeve.
Let a. in Figs. 1 and 4 designate a portion of the cylindrical surface of the commutator, and b in Figs. 1, 2 and 4 designate the stud upon which the commutator brush holder is supported, this stud being itself supported upon the dynamo in any suitable way.
LetA designate the brush holder as a whole, and B the brush which as usual is made of laminated copper. The brush holder A is self-contained, and separable from the stud b without impairing its adjustment.
The brush holder consists of a socket-piece C, shown separately in Fig. 5, a boss or setpiece D shown separately in Fig. 6, a gib E carrying a stiffening plate or spring e, a conducting sleeve F preferably of copper shown separaiely in Fig. 7, a spring S, and the requisite adj usting screws.
The socket-piece Cis formed with the usual socket c for receiving the brush, having a seat d and bridge f, the latter havinga threaded hole for receiving the screw g which clamps the gib E against the brush and thereby confines the latter against the seat cl. The gib is held from displacement by two pins h h (Fig. 2) passing freelythrough holes in the bridge. The socket-piece is connected to the supporting stud in pivotal manner lby being formed with two perforated ears the openings in which slip over the stud, the sleeve F however intervening.
The boss or set-piece D consists of a tubular boss or hub adapted to slip over the stud, with the intervention however of the sleeve F, and formed with an arm D' having a threaded hole in which works the adj usting screw G. This arm is preferably slitted to give it elasticity, and a screw j is provided for drawing its opposite parts together to clamp the adj usting screw with any desired amount of friction. The boss D is also provided with a socket k for receiving one end of the spring S, which is firmly fastened therein by means of a screw. The spring is a flat or leaf spring, and is bent around the hub portion of the boss, its opposite end being fastened or clamped by a screw Z to the socket-piece O. This spring acts in such direction as to tend to press the tip of the brush away from the commutator, the brush being forced toward the commutator by the adj ustment of the screw G, the tip of which bears upon the socket-piece O underneath the seat d in the manner shown, so that by screwing the screw forward it presses the brush toward the commutator in opposition to the tension of the spring. The boss D is held in place by means of a set-screw H entering through athreaded hole in the boss, and the end of which enters a recess in the'stud b, this reoess being preferably constructed as a longitudinal keyway, in order that the brush holder may be set in place at different points lengthwise of the stud, so as to bring the brush to any desired adj ustment against the face of the commutator. By this set-screw the boss D is firmly united to the stud so as to resist the tension exerted against it by either the spring S 01- the screw G. The boss D fits between the perforated ears i i of the socket-piece, as shown in Fig. 3, so that when the boss is set in position on the stud it holds the socketpiece against displacement longitudinally of the stud.
The metal sleeve F is introduced between the socket-piece and boss on the one hand and the stud on the other, and serves two purposes: first, it serves toimprove the electrical connection between the stud and the other parts of the brush-holder, since it afiords a IOO broad surface the contact of which with the stud is not materially impaired by the eccentric displacement of the boss D by the tightening of the screw H; and the second, it serves as a means for connecting together the socketpiece O and boss D in such manner as to pre- Vent their perforations being forced out of alignment by the tension of the spring S. It thus renders the brush holder self-contained, in order that by loosening the set--screw I-I the entire brush holder may be slipped off from the stud b without impairing the adjustment of the brush relatively to the commutator, this adj ustment being preserved while the brush is removed, so that upon replacing the brush it does not require re-adjustment.
Heretofore in brush holders wherein the brush is pressed away from the commutator by a spring and adj usted toward the commutator by an adjusting screw, this screw has been carried by the socket-piece and has reacted against an arm projecting from the stud Z), and which arm formed part of the stud and no proper part of the brush holder.
My present invention reverses the adj usting screw, causing it to work through the arm and bear against the socket-piece and constructs the arm not as an integral part of the stud, but as part of a boss or set-piece which is adjustably clamped upon the stud. This construction simplifies the manufacture, and has the advantage of enabling the brush holder to be set to different positions along the stud, and to be removed without impairing the adjustlnent.
Heretofore in brush holders either a laminated copper spring has served as the sole support of the brush socket, the socket-piece being not otherwise connected with the supporting stud or frame, or else when the socket-piece has been pivotally mounted on the stud, a steel spring has been introduced to exert a pressure upon the brush socket, being fastened to or reacting upon the stud. In the former construction the current is carried solely by the laminated copper spring, which consequently has to be fully as massive as the commutator brush. In the latter construction the current is designed to be carried between the stud and brush through the socketpiece, but this would not be applicable for heavy currents, because any imperfections of electrical contact between the two, would cause a portion of the current to be diverted through the spring, so that the spring would be heated and its tension impaired. To obviate this disadvantage, I construct the brush holder with a double or composite spring S, the same consisting of a steel spring to afford the necessary elasticity, and a laminated copper spring for conducting any current that might otherwise tend to pass between the boss and socket-piece through the steel spring. The steel spring is lettered 8, and the laminated copper Springs lettered s', the steel spring being preferably inside and the copper lamina extended around its exterior so as to bind ose against it.
The sleeve F is a simple piece of copper tube with a hole m through it to admit the end of the set-screw H. This sleeve may be made either a loose or driving fit with the boss D, but must be a free or working fit with the ears z' z' of the socket-piece.
A modification retaining part of my invention would consist in omitting the sleeve F, and bringing the boss and socket-piece ears into direct contact, but this would be an inferior construction.
I claim as my invention the following-defined novel features, substantially as hereinbefore specified,name1y:
1. In combination with a supporting stud, a commutator brush-holder consisting of a socket-piece having a pivotal bearing on said stud, and a boss having a screw for fixing it to said stud, and an adj usting screw working in said boss and acting against said socketpiece to rock it on said stud and adjust the brush against the commutator.
2. In combination with a supporting stud, a commutator brush-holder consisting of a socket-piece having opposite perforated cars engaging the stud and forming a pivotal bearing thereon for the socket-piece, a boss detachably fixed on said stud between said ears whereby it prevents the longitudinal displacement of the socket-piece, and an adj usting screw working in said boss and aeting against said socket-piece to rock the latter on said stud and adjnst the brush against the commutator.
3. In combination with a supporting stud, a commutator brush-holder consisting ol' a socket-piece having a pivotal bearing on said stud, a boss having a screw for fixing it to said stud, a spring fixed at one end to said boss and at the other to the socket-piece and tending to press the brush away from the commutator, and an adj usting screw working in said boss and acting against said socketpiece to rock it on the stud and press the brush against the commutator.
4. In combination with a supporting stud, a commutator brush-holder conssting of a metal sleeve fitting said stud, a boss engaging said stud and mounted on said sleeve, a
socket-piece pivoted on said sleeve, and an adjusting screw engaging said boss and socketpiece for adj usting the socket-piece relatively to the stud, whereby the holder may be removed bodily from the stud without impairing its adjustment.
5. In combination with a supporting stud, a commutator brush-holder consisting of a socket-piece having a pivotal connection with the stud, a boss fixed to the stud, and a metal sleeve interposed between the stud and said socket-piece and boss, and serving to make an elfective electrical connection between the brush-holder and stud.
6. In combination with a supporting stud, a commutator brush-holder consisting of a IIO In witness whereof I have hereunto signed my name in the presence of two subscribing Io Witnesses.
JAMES J. WOOD.
Witnesses:
ARTHUR O. FRASER, GEORGE H. FRASER.
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