US1240738A

US1240738A - Brush-mounting.

Info

Publication number: US1240738A
Application number: US11473016A
Authority: US
Inventors: Earle P Lee; Thomas L Lee
Original assignee: NORTH EAST ELECTRIC CO
Current assignee: NORTH EAST ELECTRIC Co
Priority date: 1916-08-14
Filing date: 1916-08-14
Publication date: 1917-09-18
Anticipated expiration: 1934-09-18

Description

E. P. &T. L. LEE.

BRUSH MOUNTING. APPLICATION FILED AUG. (4.19m.

Patented Sept. 18, 1917 UNITED STATES PATENT OFFICE.

EARLE 1. LEE AND THOMAS L. LEE, OF ROCHESTER, NEW YORK, ASSIGNORS TO NORTH EAST ELECTRIC COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF YORK.

NEW

BRUSH-MOUNTING.

Specification of Letters Patent.

Patented Sept. 18, 1917.

1 To all whom it may concern:

Be it known that we, EARLE P. Lnn and THOMAS L. LEE, citizens of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Brush- Mountings; and We 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 to make and use the same.

This invention relates to means by which.

the brushes of an electric motor or generator are guided and supported in engagement lugs, extending from the edge of the annular member and preferably struck up integrally from the same sheet-metal. The annular members are arranged in superposed position, thus providing for the two or more brushes commonly employed in direct-current machines, but the members are preferably insulated from each other, so that they may be utilized as parts of the electric circuits of the machine.

Other objects of the invention, and the features of construction by which they are attained, will be set forth hereinafter, in connection with the description of the illustrated embodiment of the inventionv In the accompanying drawings Figure 1 is an elevation of a brush-mounting embodying the present invention, looking axially from the inside of the 'machine,.the figure showing alsoapart of the frame or casing with which the brush-mounting is associated; Fig. 2 is a section on the broken line 22 in Fig. 1, and in this figure the points, two curved arms 19.

commutator, one end of the armatuieshaft,

and the cooperating ball-bearing, are also shown; and Figs. 3 and 41 are two elevations of one of the integral sheet-metal members of the brush-mounting.

The invention is illustrated as embodied in a four-pole electric motor of the inclosed type. Apart from the brush-mounting, the drawings show only the commutator 10, one end of the armature-shaft12, the ball-bearing 11 in which this shaft-end is supported, and a portion of the frame or casing of the machine. This frame comprises an endplate 13, in which the bearing 11 is mounted,'a ring 1 1, whichmay be clamped against the field-ring (not shown) of the machine in the usual manner, arms 15 connecting the plate 13 and the ring 14, and a band 16 which constitutes a removable cover, of the well-known garter type, for the openings betweenthe arms 15. I

The machine is shown as provided with four carbonbrushes 17, which are pressed radially against the commutator at four equidistant points. The principal and characteristic part of the brush-mounting resides in two sheet-metal members, of which one is shown in detail in Figs?! and 4. This member comprises an annular portion or flat ring 18, from the outer edge of which project, at diametrically opposite These arms are bent to a. position parallel with and overhanging the annular portion 18, and from the lateral edges of each arm two plates 20 are bent into parallel position, these plates forming the sides of a box-like guide in which one'of the brushes 1? slides. The back of the guide is formed by the metal of the arm.19, while the guide is closed in front by lugs 21 bent toward each other from the ends of the plates 20.

Alongside each arm 19 a lug22 is struck p a of the machine.

by whic have a right and le -hand relation. They may be conveniently formed from sheetmetal blanks which are identical in form, but from which the lugs are bent in opposite directions. These two members are arranged withthe annular portions 18 insuperposed relation, as shown, in Figs. 1 and 2, and with their various projections extending in the same direction, and they are fixed in that position within the inner surface of the plate 13, by means of screws 26 which pass through registerin openings 25 in the annular portions. To ring the brush- 'des or holders into the same plane, notw1thstand-,

ing the fact that the parts 18 lie in different planes, the arms 19 on one member are given a somewhatdeeper-curve than those of the other member.

I The brushes 17 slide radially into engagement with the commutator, and are maintained in operative position by springs 27, of coiled form. Each spring is mounted upon one of the spring-supports 23, with its outer end in engagement with the corresponding .brush, and the spring is retained in proper correlative position with the brush and the. sup ort by reason of the fact that its end is embraced between two flexible conductors or igtails 28, by which the brush is electrica ly connected with the circuits Each pigtail is provided with a sheet-metal clip 29, which is screwed to one of the lugs 22, these lugs being provided with threaded openings for that purpose, as shown .in Fi 3 and 4. v

The annular mem ers '18 constitute conductive 1paths forming parts of the circuits the brushes andvthroug'h the pigtails. Accordingly, the In 24 are utilized as the positive and negative terminals of the brush mounting, and are shown as provided with binding-screws 30, which serve to attach the clips 31 on the ends of current-leads or wires 32, which extend to the field-windin or the main terminals of the machine in t e usual manner. I v

' It will be apparent that the brush-mounting above described comprises few members, which may be made inexpensively and easily assembled in a compact relation. The invention has been shown, particularly, as adapted to a multipolar motor or generator the arrangement being such that each-pair of diametrically-opposite brushes is interconnected by the annular member 18 on which 'they are mounted in common. It will be current is conducted to and from obvious, however, that the, invention is equally applicable to a bipolar machine, by a slight rearrangement of parts which need not be described, and that the invention, in general, is not limited to the embodiment thereof hereinbefore described, and illustrated' in the accompanying drawings.

We claim:

l..A brush-mounting comprising a substantially flat sheet-metal ring; an arm projecting integrally from one edge'of the ring and transverse to the brush-holder formed mtegrall .upon' said am by ends in the sheet-met thereof.

2. A brush-mounting com rising a substantially flat sheet-metal rlng; a springsupport and an arm projecting integrally from the outer edge of the rin and transverse to the plane thereof; a rush-holder formed integrally upon said arm; and a spring coiled about said spring-support and adapted to engage a brush m t e brushholder.

3. In a dynamo-electric machine of the inclosed t pe, thecombination, with a head of the casing thereof, of two Brush-mounting devices each comprising a substantially flat sheet-metal ring and a brush-sup orting member integrally connected with t e ring at an edge thereof, said rings being superposed, but insulated from each other; and means fastening the rings to the casing-head coaxially with the armature-shaft of the machine. I

4. A brush-mounting comprising a sheetmetal ring; and a brush-holder, a springsupport and a terminal-lug all struck up integrally from the sheet-metal of the ring at the outer edge thereof.

5. In a dynamo electric machine, the combination of a ring; a brush-supporting member and a spring-support projecting laterally;

from the ring; a brush movably mounted on the brush-supporting member; a spring coiled about the spring-support and havin one end in engagement with the brush; an a pairof pi ail connectors connecting the brush and t e ring, said connectors being attached to the brush in position to embrace said end of the s ring so as to prevent lateral displacement oi the spring.

6. Ina dynamo-electric machine the combination, with the frame thereof, of two brush-mounting devices each comprising a sheet-metal ring and a plurality of brush supporting members integrall connected with the ring at an edge thereo; said being superposed, but insulated from eacii lane thereof; and a to receive fasteningdevices; an armprojecting integrally from one edge of the ring and transverse to the plane thereof; and means, carried by said am, for supporting 5 and guiding a movable brush.

8. In a dynamo-electric machine, the combination of a sheet-metal ring; a brush-supporting member projecting integrally from an edge of the ring; a brush movebiy mounted on said. member; e flexible connector con- 19 necting the brush and the ring; emi a main c0nduct0r also cennectai to the ring.

EARLE P. LEE.

THUS L. LEE.