US1067620A - Commutator-brush for electric generators and motors. - Google Patents

Description

P. P. NUNGESSER.

GOMMUTATOR BRUSH FOB. ELECTRIC GENERATORS AND MOTORS.

APPLICATION FILED MAY 19, 1911.

Patented July 15, 1913.

2 SHEETSSHEET 1.

. DYYEJYTOR Fm'dm P. HumaEssER q 'M ATTYS.

Arrrsz P. P. NUNGESSER. OOMMUTATOR BRUSH FOR ELEOTRIG GENERATORS AND MOTORS.

APPLIGATIOZI FILED MAY 19, 1911. 1,067,620. Patented July 15, 1913 Z SHEETS-SHEET Z Fig.8

flrri I [HYZZYTOIZ W/ PHILIP NUNGESSER K. I BY Z'ALPWW 1mg.

UNITED TATES FATE I canton.

PHILIP P. NUNGESSER, 0F CLEVELAND, OHIO, ASSIGNOR TO THE NUNGESSER ELEC- TRIO BATTERY COMPANY, OF CLEVELAND, OHIO, A CORPORATION.

COIlIIlIUTA'lGR-BRUSH FOR ELECTBIC'GENERATORS ANDJHOTORS.

Application filed May 19,,

b all whom it may concern:

Be it known that I, PHILIP P. Nunenssnn, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio. have invented certain new and useful improvements in Commutator- Brushes for Electric Generators and Motors, of which the following is a specification.-

My invention relates to commutator brushes for electric generators and motors, all substantially as shown and described and particularly pointed out in the claims.

i Tn the accompanying drawings, Figure 1 is a perspective view of the brush with a flexible wire conductor attached thereto. Fig. 2 is a sectional elevation of the carbon shown in Fig. 1, and Fig. 3 is a perspective view of the screws for fastening the cap and conducting parts on the brush together. Fig. '-'l is a perspective view of the conductor and contact plate, and Fig. 5 is a perspective view of the cap alone. Fig. (3 shows the conductor with its strands of fine wire opened and spread apart to amplify conductivity and avoid resistance and heating, as hereinafter fully described. Fig. 7 shows the brush or body alone, and Fig. 8 shows the blank fonthe contact-or conducting plate.

The invention. as ithus disclosed is. designed. to overcome. (or avoid. the; trouble experienced in many m'akes (if-commutator brushes of undue resistance atthe point of connec-.

tion'between conductor and the-brush. One

of the common ways of making such connecconnections h ave not only been very unre} liable because of the low temperature at which the solder would loosen or melt but the area which can be advantageously covered by such means is narrow at the best and therefore liable to induce heating and destruction.

Of course I am aware that others have met the same difficulty and sought to overcome it by various mechanical appliances and in some instances probably with more or less success, such,-for example as have spring contacts of more or less area, holes bored in the carbon and plugs therein for connecting the conductor. and spring clips and such like means, all of which I expressly disclaim. But, notwithstanding, I am not aware that the means shown and described herein have ever before been known or used.

Specification of Letters Patent.

. Patented July 15, 1%.3. 1911. Serial n 528,1;3.

My invention therefore consists in a carbon, graphite orlike brush B of any suitable vmaterial ,andavith square or beveled bearing surface as.,.may be best suited to the particular machine with which itis em-s ployed.

(1 represents a cap of copper plate, preferably but which may be of any good con- :duct-ing metal. 1 The brush body is rabbeted or recessed at 2. and 2 on opposite sides at its top a suilicient depth to comfortably seat the-fiat sides 3 of the said cap therein and to accommodate the contact member as hereinafterdescribed and the top of, the said brush is=furtl1er provided with, two-- transverse holes a and a slight cavity 5 in itsedge. 'The cap Chas holes 7.corresponding to -the holes. 4 and a' hole 8 on its top adapted to enter the conductor D through the same to engage Withplate P .relativelyrr as seenin' Fig. 1. The. said plate: P. likewise is of copper or other good conducting material and is shown as bent lengthwise across its middle and folded witlrits sides closely upon eachaother except as they are; slightly spaced apart by the spread Wires 10 ofthe conductor C shown in..Fig.. 6. In construction the said conductorconsists-ot anum er otsenanate stran sot ravi iconne wire mound. toge her. on: bout ea h Qtbenin i-ifi lali farmland. soakete iaiaiel p 12 attl einioutera ends. oxhi ethe ianerie .iottheeaducton has; allii s i-Wiresautvr n spaced. apart aodtsrrea tmqsei lawle on radial lines so as to produce an'unusually de ,,s 1: ece.. :,.ar. a, a nd' air d .v rise state's jar uit ohaiit r i aiii fiat tened. or rather the Wires are drawn out into about the same plane so as to bring the same between the sides of plate P, and the entire inner portion of said plate is filled with the said wires while the sides of the plate are pressed down close and fiat-against or upon the said wires. This distributes electrical contact evenly over the entire surface of the plate and afiords such amplecontact area that resistance at this point is eliminated and the connection remains cool and effective. The plate P has a hole 14 of half round shape in this instance in its top through which the conductor is engaged inside as seen in Fig. 4. The cavity 5 in the brush makes room for the inner portion of the conductor at its junction with said plate, and the recess in'the side of the brush is made deep enough to accommodate the plate P with the side 3 of the cap overlapping the same. The said plate also has holes 9 which register with the holes 4 and 7 respectively, and the clamping screws 15 and 16 bind the several parts firmly to gether through these holes. The said screw 16 is threaded internally in which screw 15 engages, and by these means the cap 0 is firmly clamped or bound upon the plate P and said plate firmly clamped against the wall of the brush body, while the conducting wires within plate P are spread over both sides of said plate and amplify the contact. Screw 16 is upset after insertion to prevent rattling ofi. In the construction thus described the doubled plate P is the real conducting member through which the current flows from the cable or conductor D to the brush B, and cap 0 in fact is a confining 3 medium with the further advantage or value of serving as a protection for the top of the brush. As to the said member or plate 1 it may be added that after the small wires have been engaged therein as above described the plate is subjected to such heavy f tamping or compression that the wires are 5 flattened and thus as nearly incorporated with the plate as is possible without actual amalgamation or welding. No solder is used in the entire connection for various reasons, l

already indicated, and because when used between a plate and the carbon it remains serviceable only as long as the adhesion occurs, and which is liable to become detached under abnormal conditions.

The small screw 15 is uraosel located 1 l .V

on the same side as plate P so that the least possible amount of metal shall be removed to enter the screw thus preserving the conducting surface of said plate as fully as possible and avoiding heating of the parts.

The cap 0 in addition to having a binding medium for the conducting parts serves as a contact for a pressure spring when the chief reason for carrying the same across the top of the carbon.

The straight edge in hole let facilitates the spreading of the small wires at their base in the twisted portion of the cable.

The brush B may. be electro-plated at the .-;-i'lrlaccs contacted by member P'and cap C, and opening 8 in the cap C is amply large to accommodate free vibratory movement of cable I) therein.

What I claim is:

l. A commutator brush and a cap thereon overlapping the sides of the brush, a conductor consisting of fine wires having said wires opened and spread. apart, a plate bent at its middle and having its sides folded flat against each other upon the said spread portion of the conductor and clamping screws through said parts binding the same firmly upon the brush.

2. A current-conducting connection comprising a cable of fine Wires twisted to gether and having a portion untwisted and spread and a folded contact plate engaged with the spread portion and having a halfround opening for the cable on-the line of the fold.

3. A carbon brush and cap therefor and a current-conducting cable of twisted wire having a flattened portion, said brush, cap and flattened portion having corresponding transverse openings, and a set of clamping 1 screws projected through said openings to bind said parts together, one of said screws being upset as to the other to make permanent connections. v

In testimony whereof I ai'iix my signature in. presence of two witnesses.

PHILIP P. NUNGESSER. Witnesses:

R B. Mosnn, F. C. MUSSUN.

Images