US784102A - Brush-holder for dynamo-electric machines. - Google Patents

Description

No. 784,102. PATENTBQD MAR. 7, 1905. J. BURKE.

BRUSH HOLDER FOR DYNAMO ELECTRIC MACHINES.

APPLICATION FILED MAY 3, 1904.

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UNTTED STATES Patented March '7, 1905.

PATENT OEEIcE.

JAMES BURKE, OF NEW YORK, N. Y., ASS IGNOR TO BURKE ELECTRIC COMPANY, A CORPORA ION OF NElV JERSEY.

BRUSH-HOLDER FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 784,102, dated March *7, 1905,

Application filed May 3, 1904. Seriill I '7- To all whom, it nuty concern:

Be it known that I, JAMES BURKE, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Brush-Holders for Dynamo- Electric Machines, of which the following is a full, clear, and exact specification.

My invention relates to dynamo-electric machinery, and particularly to an improvement in brush-holders. I

The object of my invention is to produce an improved brush-holder simple in construction and of such a design that all the parts may be readily and easily manufactured and assembled.

By my invention the brush-stud is preferably threaded, and mounted to turn thereon is a supporting member for each brush. These supporting members are adapted to be punched from sheet metal. 1 also provide a supporting-plate, which may be made from sheet metal in a similar manner.

My construction furthermore includes means for regulating the pressure of the brushes upon the commutator, which brushes may be conveniently raised therefrom for the purpose of cleaning, renewal, &c.

The details of my invention will be understood ifrom the following description and accompanying drawings, which show the preferred form of my invention, and the novelty thereof will be definitely set forth in the claims.

Figure 1 shows a plan view of my improved brush-holder. Fig. 2 shows a side view thereof; Fig. 3, a side view of a modified form; Fig. 4, an end view of a commutator of a bipolar machine, showing the brushes in their relative positions; and Fig. 5 shows an end view of a brush-holder with the brush-stud secured to the brush-ring, such as is commonly used in multipolar machines.

Referring to Figs. 1 and 2, the brush-stud 1 is carried by a plate 2. This plate is provided with two ears 3 at right angles to the main portion of the plate, the said ears serving to support'the stud 1, which is held in place by. the screws 4. Upon the stud 1, which is in this instance threaded, as shown, are

mounted the brush-supports so as to turn thereon. These are preferably stamped and formed into a U shape from shectmetal. The arms 5 of each support have threaded openings at their ends for the stud 1, and the brush 6 is secured at the opposite end of the support to the part 7 at right angles to the arms by the screw 8 and nut 8. The brushes are shown with converging sides and overlap each other.

The arms 5 are provided with notches 9, which are engaged by a pin 10. A spiral spring 11 engages the pin 10 and is insulated by sleeve 10 to prevent current passing through the spring and is secured at the opposite end to the plate 2, thus exerting a downward pull upon the brush. The brushpressure is regulated by moving the pin 10 to different notches 9 at a greater or less dis tance from the axis of the brush-stud. Each of the arms 5 has one corner, 5, rounded and one corner, 5, square, so that in case ofbrcakage of the spring or at any time when the spring is disengaged the support and its brush may be thrown or turned backward to a definite position and prevented from falling in contact with the commutator or frame of the machine.

In Fig. 2 the brushes are shown at right angles to the arms 5; but it is sometimes more convenient to incline the brushes with reference to the arms, as shown in Fig. 3. The latter form is also shown in Fig. T, in which the commutator is indicated by the circle 12. The parts 13 extend from the end bracket of the machine, and the brush-holders are secured thereto by means of bolts lei, which pass through holes 15 in the plate 2, the brushholders being insulated by a sheet 16 and bushings of suitable material.

Fig. 5 illustrates a construction adapted for machines in which a brush-yoke or support ing-ring is used, such as is common in multipolar machines. The construction is in general the same as above described except that the stud 1 forms the main su pport for all parts. The threaded stud 1 passes through an opening in the brush yoke or ring 17, only a portion of which is shown, the material 18 serving as insulation. A nut 19 and washer 2k) JOC - vided with a central opening to receive the screws 8, and when one end of the brush has been worn away it may be reversed, so that the other end will engage the commutator. The current readily passes from the brush to its U-shaped support, as it is held in firm contact therewith, and by reason of the threaded engagement of the arms 5 with the stud 1 under pressure of the springs 11 a very good electrical contact is made with the stud. I may also use flexible connections from the brushes or supports to the stud or plate 2, as may be desirable, when the stud is not threaded. Current may be conducted from the stud in any convenient manner, such as by terminals 21 or by the plate 2 and mains connected thereto.

While I have shown a brush-holder provided with three brushes, it is evident that any number desired may be used, from one up. Also the specific arrangement for regulating the brush-pressure may be modified and other immaterial changes may be made in my construction without departing from the scope of my invention. and 1 am not limited to the exact construction shown.

It is evident that my construction is one of great simplicity, permits convenient adjust ment of brush-pressure, secures good contacts for the passage of the current, and allows convenient access to and removal of the brushes.

Having thus described my invention, 1 declare that what 1 claim as new, and desire to secure by Letters Patent, is-

p 1. In a brush-holder for dynamo-electric machines, the combination of a threaded stud, a U-shaped sheet-metal support mounted to turn thereon, a brush fixed to said support, and means't'or forcing the said brush against the commutator, said means being adjustable along the length of said support, substantially as described.

2. In a brush-holder for dynamo-electric machines, the combination of a threaded stud, a plurality of lJ-shaped sheet-metal supports mounted to turn thereon, a brush fixed to each of said supports, a fixed member, and means for forcing the brushes against the commutator comprising a plurality of springs attached to said fixed member and having the opposite ends of said springs individually adjustable along the length of said supports, substantially as described.

2). in a brush-holder for dynamo-electric machines, the combination of athreaded stud,

one or more U-shaped sheet-metal supports mounted to turn thereon and having notched edges, a brush fixed to each of said U-shaped supports, a fixed member. and a spring for each of said supports having one end attached to said fixed'member and the other end making adjustable engagement with one of said notched supports, substantially as described. el. In a brush-holder for dynamo-clectric machines, the combination of a stud, a plurality o't' U shaped sheet-metal supports, the arms of said supports engaging the stud, a brush fixed to the opposite end of each of said supports, said brushes overlapping each other, and means for forcing the brushes against the commutator, substantially as described.

5. In a brush-holder for dynamo-electric machines, the combination of a threaded stud, a plurality of U-shaped supports, the arms 01 said supports engaging the threaded stud, a brush fixed to the opposite end of each oi said supports, said brushesoverlapping each other, and adjustable means for forcing the brushes against the commutator, substantially as described.

6. in a brush-holder 't'or dynamo-electric machines, the combination of a stud, one or more U-shaped sheet-metal supports, the arms of said supports engaging the stud, a brush fixed to the opposite end of each of said supports, a fixed plate, and a spring for each of said supports, engaged at one end to said sup ports and at the other end to the said plate, substantially as described.

7. In a brush-holder tor dynamo-electric machines, the combination of a threaded stud, one or more U-shaped sheet-metal supports, the arms of said supports engaging the threaded stud and having notched edges, a brush fixed to the opposite end of each of said supports, a fixed plate, and a spring for each 0t saidv sup ports ad justably engaged at one end to said supports and at the otherend to the said plate, substantially as described.

8. .In a brush-holder for dymuno-electric machines, the combination of a supportingstud and plate, said plate having ears bent at right angles and engaged by said stud, supports mounted to turn on said stud, a brush carried by each of said supports, and a spring engaging each of said supports at one end and the said plate at the other, substantially as described.

9. In a brush-holder for dynamo-electric machines, the combination of a supportingstud and plate, said stud being threaded, and said plate having ears bent at right angles and engaged by said stud, supports mounted to turn on said stud, and a spring zuljustably engaging each of said supports at one end and the said plate at the other, substantially as described.

10. In a brush-holder .t'or dynamo-electric machines, the combination of a supporting stud and plate of sheet metal, said plate having ears bent at right angles and engaged by said stud, U-shaped supports of sheet metal mounted to turn on said stud, a brush carried by each of said supports and a spring engaging each of said supports and secured to said plate, substantially as described.

11. In a brush-holder for dynamo-electric machines, the combination of a stud, supports mounted to turn thereon, a brush carried by each of said supports, said brushes overlapping each other, and means for forcing the brushes against the commutator, substantially as described.

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