US1275458A

US1275458A - Brush-holder for commutator mechanisms.

Info

Publication number: US1275458A
Application number: US16896117A
Authority: US
Inventors: Charles R Meston; Herbert I Finch
Original assignee: Emerson Electric Co
Current assignee: Emerson Electric Co
Priority date: 1917-05-16
Filing date: 1917-05-16
Publication date: 1918-08-13
Anticipated expiration: 1935-08-13

Description

C. B. MESTON & H. l. FlNCH. BRUSH HOLDER FOR coMMuTAToR MEcHANlsMs.

APPLICATION FILED MAY I6, 1917.

Patented Aug. 13, 1918..

r for Commutator Mechanisms, -of which theA y UNITED .STATES PATENT 'ormoni CHARLES R. MESTON AND HERBERT I. FINCH, OF ST. LOUIS, MISSOURI, ASSIGNORS TO THE EMERSON ELECTRIC MANUFACTURING COMPANY, OIIS'rST.V LOUIS,` MISSOURI, A.

CORPORATION OF MISSOURI.

`:BRUSH-HOLDIER. FOR COMMUTATOR MECHANISMS.

'To all wom t may concern.'

Be it known that we, CHARLES R. MEsToN and HERBERT I. FINCH, citizens of the United and useful Improvement in Brush-Holders following is a fullclear, and exact de scription, such as will enable others skilled 1n the art to which it appertans to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

This -invention relates generally to elec'-A trical apparatus, and specificallyv to an 1m-l proved construction of brush holder for commutator machines.

The broad-object of our inventlon 1s to provide a commutator brush holder which.

contributes to economy both in manufacturing cost and in operating cost.

A more specific object'of our invention is to provide a brush holder which with the substitution of a minor part, may be used interchageably on either side ofthe commu-1' tator wheel. y

.Another object isv to provide a brush 'holder construction which' may be advantageously employed in D. C. machines| to prevent current losses through the frame of the machine, and to secure at the same time the proper radiation of the heat from the brush and the brush box. v

A further object is to provide a brush holderfwhich permits the quick and easy removal 'and insertion of the `brushes from v either side of the brush box, which permits such as would be taken on line 3-3 of Fig. 1; l

Fig. 4 is a' detail illustrating an arrange- Speccation of Letters Patent.

Application led'lfay 16, 1917. Serial No. 168,961.

Patented Aug. 13, 191s.

ment of the device for certain classes of A. C.machi1 1es. l v

' Referring to these illustrations by means of the reference numerals applied,'let"it be.

understood that, 1 represents a base member of insulating material which maybe of gen` 2, a lthreaded bushing 5 iscast in the base member 1, forming a seat for a screw 6. The base member -1 has a countersunk portion concentric with the bushing 5, from which.

countersunk portion extend countersunk slotways 7 extending radially of the bushing 5 in different directions. A connection llnk 8 is. adapted to occupy the countersunk portion just referred to, and the radially extending arm of said link 8 is adapted to occup either one of the countersunk slotways 7. he sc lew 6 carries a sleeve 9, at the outer i extremity. o f which isv mounted the pressure arm 10. Thls arm may be stamped from sheet metal-and shaped .to provide the hub portion 103, with 'peripheral shoulders or retain- 'lng members 10",' and the arm portion 10" extending laterally from the hub portion 10 and terminating in contact members 10".

vIt is preferable that the pressure member be bilaterally symmetrical so as to permit its lbeing reversed relative to the brush box.

The sleeve 9 and pressure member 10 are held on the screw 6 by the head of the latter and by a nut 11 which is threaded onto the screw. When the screw is seated in the bushing' 5, the nut 11 operates also to retain the connection link 8 in one ofthe slots 7. A torsional sprin 12 is vdisposed on the sleeve 9, one end t ereof being retained by pin 14 on the base member 1, and the other end being adapted to coperate selectively with the shoulders or retaining members 1()b of the pressure arm, whereby to hold the arm under the desired spring pressure. The pressure of the spring may be varied by adJust- 'ment of the end which engages the retaining members 10b. With the parts thus arranged,

the pressure member is urged by the spring to move the brush 4, with which one of the contact members 10d makes contact, toward the commutator, and thereby hold it for the proper electrical contact therewith. The brush may be instantly removed by swinging back the pressure member 10, and lifting out the brush.

In order to use the brush holder interchangeably on both sides of the commutator, it is necessary to provide two springs, the same being similar in construction but differentially wound, that is, one wound with a righthand helix and the other with a lefthand helix.

v Bushings 15 are cast in the base member -1, opening at the rearward side thereof, and

said bushings thereby form screw seats into which proper screws may be setto attach the brush holder to the machine frame. A given brush holder may be attached on either side of the commutator wheel as, by placing a proper spring upon sleeve 9 and arranging the respective ends of said spring in proper position5 on pin 14 and shoulders 10b, the pressure arm will coperate with the brush at either side of the brush box selectively, and the connection link 8 may be adjusted as between the slots 7 to the most advantageous position.

It will be seen, consequently, that this device affords a very economical brush holder by virtue of the small number of parts which may be employed in this construction and the fact that for the most part they ma be formed as stampings or punchings rom sheet metal. Moreover, the fact that the same i device with the change of. but a minor part,

namely, a spring may be used either as a righthand or as a lefthand brush holder obviates much manufacture and handling cost.

Furthermore, the device contributes to econl omy of operation by virtue of the fact that the brush is completely insulated from the machine frame, the insulating material of the base, in fact, forming one of the walls of the brush box; Likewise, the arrangement of the pressure spring protects it from injury by current from the brush.

In addition to the pressure member 10 being adjustable to either side 'of the brush box, the connection link 8 is also similarly adjustable from one slot to the other so that it may be disposed in the most convenient position for the attachment of the brush connection 13, and in either adjustment it is heldin definite position by the slot walls of the base member.

A brush holder of this description has the distinct operating advantage of permitting proper heat radiation from'ithe brush and brush box whileat the same time providing the proper insulation of said parts from the machine frame, as the comparatively thin metallic member 2 allows the rapid dissipation of heat from the brush into the air.

1n Eig. 4, we have shown a modification in Vwhich the device is intended for use in a machine in which the brushes are short-circuited through a frame part on which they are mounted, such as is desirable practice in certain alternating current machines. In this modification, the base member 1 is formed as a portion of a ring member 3 which is arranged t0 be mounted on the motor frame, and which functions as a short-circuiting member between the brushes. It willbe understood that the companion |brush is mounted on 'a similar base member carried by the.

.the base member 1 forms one of the Walls Vfor retaining the brush'. The same form of brush holder, pivot screw, pressure arm and spring may be employed on both of the base members 1, said parts Acorresponding to those hereinbefore described. 'The connection link 8, however, may be dispensed with,

the brush connection, if desired, bein made directly to the base member 1'-, or to t e ring member 3; or the member 13 may be dispensed with and the brush connection may be secured solely through the pressure member 10, and thepivot screw 6 or link 8 used' as a binding post for a lead connection.

We are aware that the device is susceptible of various modifications and adaptations not herein specifically illustrated or described, but comprehended nevertheless within the scope and spirit of the appended claims.

What we claim is:

1. A brush holder comprising'a base member of insulating material, a brush box mounted thereon and cooperating therewith to form a container for the brush, anadjustable pressure member pivotally mounted on the base member to one side of the brush box, and separate means supported on the insulating base for urging the pressure memher for coperation with a brush retained by the box.

2. In a brush holder, the combination of a brush box, a pressure member pivotally and adjustably mounted adjacent theretoand having brush engaging members extending in opposite directions for coperation with either end of a brush in said box, and adjustable means for urging the pressure member for coperation with the brush. Y p

3. In a brush holder, the combination of a base member, a brush box extending transversely thereof, a pivot mc'nber Seated in the base member at one side of the box, a pressure member rotatably mounted on the pivot member, said pressure member including form a container for the brush, a pressure member pivotally and adjustably mounted on the base member, and attaching means for the brush holder coperating with the base member and insulated from the brush box and the pressure member.

5. A brush holder comprising a base meml 'mining the selective locations of'said link.

ber, a box Amounted thereon and coperating therewith to form a brush container, a-

brush disposed within said container, a pivot screw mounted on said base member,A a pressure member, means for 'mounting said pressure member on the pivot screw wherey said ,member may be swung from one Iend of the box to the other for en agement .with the rear end of the brush in te container, a spring coiled about the piv'ot screw and ad- 'ustably coperating with the pressure mem'- er to urge the same against the brush, and a. connection member on the base member disposed for electrical` connection brush. c l Y 6. A brush holder comprising a base member, a brush box mounted thereon, and an adjustable pressure member pivotally mountwith the `Aed on said base member and provided with a pair of oppositely disposed brush engaging portions.

7. A brush holder comprising a base member, a brush box mounted thereon and adapted for the reception of a brush, and a connection link adjustably secured to the base member and adjustable to selective positions for reception of electrical connections; said base member including portions for deter- 8.111,1 a device of the `class described, a base','.a brush box carried thereby, and a spring-pressed member pivotally mounted on the base to one side of the brush box and adapted to be swung from one side of the base to the other so as to engage the rear end of the brush positioned in said brush box.

`In testimony whereof we hereunto aiix oursignatures this 14th day of May, 1917.

' CHARLES R. MESTON.

HERBERT I. FINCH.4