US1188761A - Carbon-brush connection. - Google Patents

Description

C. HAMBUECHEN.

CARBON BRUSH CONNECTION.

APPLICATION flLEVD- APR- ,17| 19l4.

Patented June 27,1916.

WMM awed:

UNITED STATES PATENT OFFICE.

CARL HAMBUECHENfOF BELLEVILLE, ILLINOIS, ASSIGNOR TO AMERICAN CARBON- & BATTERY CO., OF EAST S'l.v LOUIS, ILLINOIS, .A CORPORATION ILLINOIS.

CARBON-BRUSH CONNECTION.

Specification of Letters APatent. l Patented June 27, 1916.

Application filed April l?, 1914. Serial No. 832,663.

To all 'whom it may concern Be it known that I, CARL HAMBUECHEN, a citizen of :the United States, residing at Belleville, county of St. Clair, State of Illinois, have invented certain new and useful Improvements in Carbon-Brush Connections; and I do hereby declare the following to be a full, clear, and exact description of the invention, 'such as will enable others skilled in the art to which it appertains tomake and use the same.

It is the object of the present invention to .provide a connection between aflexible conductor and a carbon block such as is used for motor brushes, dynamo brushes, and in theelectrical arts generally, and more'particu* larly to provide a detachable connection whereby the carbon block may be disconnected for renewal. E

To accomplish the foregoing object and others, which will hereinafter appear, the

carbonI block is provided with a cavity which is filled with an amalgam, such as a copper amalgam, the cavity being first preferably lined with copper by electro-plating, and the' conductor is electrically connected to this amalgam filling or plug by means of screws or the like threaded into ,thev amalgam. Preferably a plate to which the flexible conductor is connected seats on the top of the brush and is held tight'by these screws.

In the accompanying drawings, Figure 1 is a side elevation of a motor brush with the connection of the present invention; Fig. 2 is a sectional elevation through thesame; Fig.

3 is a plan View; and Figs. 4 and 5 are sec- .tions through a modified form wherein the drilled holes filledwith amalgam do not converge.

Inthe embodiment illustrated,.the carbon block 1 may beof usual size and composition, and the flexible conductor` 2 is preferably of stranded copper wire. At the top of the carbon block two converging holes 3 and 4 are drilled until they intersect, forming a V- shaped`cavity in the upper part of the brush, say in the upper half. This cavity is then lined with copper by electro-plating, since by this method an intimate contact is established with the carbon surface of the cavity. The entire cavity is next filled with an amalgam, preferably a copper amalgam, to form a plug or illirgto which the other parts lmay be mechanically connected. The composition of the amalgam and its mode or production may vary, but satisfactory re.- sults are obtained by using parts by we1ght of copper powder, or copper bronze powder, to 50 parts mercury. -To prepare the amalgam, copper bronze powder is wet with water to a paste and then the mercury 1s added, and the materials rubbed together thoroughly. A small quantity of dilute sulfuric acid is then added and the mixture again rubbed. and complete amalgamation effected, after which the material is washed free of acid. The amalgam is then in porous or puffy condition and can readily be tamped into the cavity without the use of heavy pressure, and without danger of cracking or rupturing the carbon block. It felts `together well, and after standing for 24 hours becomes hard and coherent and possessed of the desired mechanical strength. Other pro-` portions may be used, but with'toolow mercury content the mixture is too dry, and will notl pack or felt together' well, and with too much mercury it is too brittle to be tapped. The mixture above specified is of good conduetivity'and swells slightly on hardening and superficially amalgamates with the copper lining, and is otherwise well adapted for thepurpose, though I am aware that the amalgam may contain other components and be compounded in other ways.

The amalgam plug 'after hardening is drilled down the center of each leg of the V and then is tamped to receive the threaded screws 5 and 6. These screws not only serve as current conductors to or from the amalgam, but also hold tightly clamped againstl the top of the brush a. conductive plate 7.

7 is also provided with an integral strip which is bent up and rolled together at its edges to form a socket 9 -into which the end of stranded conductor 2 may be received,

and by which it may betightly gripped without the need for soldering. Current passing through the stranded conductor 2 can fiow from plate 7 into the carbon block, 4

and to facilitate-this the top face of the block and a portion of its sides may be electroplated with copper, but a large part ofthe current flow passes through screws 5 and having and through the amalgam trilling, tiret an even distribution of current is obtained wi i consequent freedom from l local heen The entire connection ie tree frein sole' er other low fusing metals, or alloys, ano the amalgam filling becomes harder with age or i?" it l di gain adheres n'iost tenacimif-:ly in the cavil e l, and a satisfactory connection can be inaile lilith either modification here disclosed, there is; no tlaiiger that 'the com. relator will be ii'ijured by the metal parte oi con-A nec-tion, for even though the brush iv down until the amalgam lilling coince ia Contact with the coininutator,

l this; filling ie softer than the commutator and will not produce destructive Scratching.

am aware that various changes'. anal modifications in 'the forni and, arrangement oi parte may be niadejwithout depart-ing from the spirit oi' the invention as delinetl by the appended claims.

l claim r l. The con'ibination with a carbon brush a cavity, an amalgam filling there in7 a etraiitled conductor, a plate coiinected t eaifl stral'nletl conductor anfl a Screw threaded inizi said amalgam and Securing eaiil plate 'to Seid cabon brogli.

lhe combination oig a carbon having a plurality of holes, an el intro-plated lining 'iur said holes, an an'ialgani lilling for said holes, a stranded conductor, a plate cared to said. stranded conductor and euren pans-ing threi'lgli. said plete ainl thro;

brush into said oinalgani lilling` 3. A carbiin oeh having a .ilnl'al f drilled holes :t its top, a copper l filling for Said holes, ecrc lgl'lio: said aan-lignei, a plate coverin i., ieexrei a etraniletl conductor connected with said e combination of a carbon brush, 'a c n jlncting plate covering the top o'l: the carbon brush and secured thereto and hav-- :in uptnrnctl iz'itegral linger whereby the brush may bc lifted, and having an ripetending integral socket 'lor the reception of a conductor and a. stranded flexible conductor ecatcil 1n Saul socket; substantially 21S described. l

(l. The conibination of a carbon brush. lizrvlng a jblinfality of converging holes in the top thereof. forming a cavity, an electro-v pliitecl lining :for said cavity, an anialgani lilling l'or saiol cavity supericially amalgainated :with said lining and coi'nprising copper :intl inercury in about equal parts, screws threaded into said amalgam, a conducting plate contacting with the top of the carbon brush, Said plato being removable troni Said carbon brush upon withdrawal of the screive, and a stranded iexible cmiductoi.l peri'nzo iicntly attached to said plate.

7. The combination of a carbon brush having a plurality of converging cylindrical holes drilled in the top thereof, an :nnalgam lilling :lor said holes, screwe threaded into eaiil filling, a l'lat nulmeting plate colf'ering the top ol the carbon bi'nelrencl having an upturned integral linger whereby the brush may be liited, and having an opstanding integral socket 'for the reception of a conduce tor, said plate being removable from said.

gripped thereby; substantially described. ln ieetnnony whereot l alhx my signature.

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