US1090159A - Brush-holder. - Google Patents

Description

' J. C. LINCOLN.

BRUSH HOLDER.

APPLIGATION FILED JULY 19, 1911.

Patented Mar. 17, 1914.

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JOHN '0. LINCOLN, 0F CLEVELAND, OHIO.

BRUSH-HOLDER.

following is a specification, the principle of y the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish vit from other inventions.

My invention relatesto a brush-holder, and more particularly to an adjustable feature in conjunction with improved details of construction.

The object is the provision of a device of this general character which, while entirely simple and economical of manufacture, will nevertheless insure increased efliciency.

The said invention consists of means which are hereinafter fully described and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detail certain means embodying my invention, the disclosed means, however, constituting but one of various mechanical forms in which the principle of my invention may be applied.-

In said annexed drawings Figure l is a side view of a brush-holder embodying my invention. Fig. 2 is a top plan of one extremity thereof. Fig. 3 is a section on line III-III of Fig. 2, looking in the direction of the arrows. Fig. 4 is a perspective view'of one detail.

The construction comprises a primary supporting yoke A which is concentric with and supported by means of a set-screw a to the commutator B. The yoke comprises, for the purposes of illustration in this instance, two diametri'cally opposite extensions a2, each of which is provided with an open rectangular slot a3. A pair of exactly similar supporting brackets C are fixedly secured in these slots through the medium of the .vashers c and nuts o2.

In the course of the subsequent llescription by reason of the fact that the individual brackets are identical, only one will be described, and hence but one such bracket will be hereafter referred to. This bracket is thoroughly insulated from the yoke by means of the insulation D interposed on either side of the yoke, and the insulation D Serial No. 639,433.

disposed within the slot a3, as best seen iu Fig. 2. v

The bracket C projects forwardly across the comlnutator, and is formed with a rec tangular radially disposed socket opening c3. Extending from the bracket, and as shown contiguous the central portion of the socket opening o3 is an arm c4. This arm is provided near its extremity with a transverse plain opening c5 and also with a second plain oipening c perpendicular to and intersecting t is opening-as very clearly seen in Fig. 3. A stud E extends through the opening c5, and is provided therein with a depressed worm-threaded portion c. This stud projects on either side of such opening, and is provided in each of its ends with a flat open slot e2 clearly appearing in Fifrs. 2' and 4. An adjusting screw F is normaly seatedin the opening c6, and by reason of the intersection of this opening with the opening c5 is adapted to mesh with the worm threads e, as clearly seen in Fig. 3. It will accordingly be apparent that a rotation imparted to the adjusting screw Fv will be transmitted .to the stud E.

A pair of carbon brushes G having a contact area ample for the current to be commustud E and have their inner ends 7: iixedly secured in the slots e2. These springs K have their outer free extremities k2 normally bearing against the outer ends of the carbon brushes G, as most clearly appearing in Fig. 2. It should now be obvious that when the rotation of the adjusting screw F is im'- parted to the rotatable stud E, the latter will tend to either increase or diminish the degree of tension existing in the spiral springs K, and accordingly the degree of pressure exerted upon the outer ends of the carbon brushes. Accordingly an adjusting feature of my brush-holder is provided through the simple manipulation of a single screw, whereby the pressure upon the brushes 4may be regulated to be practically uniform throughout their efficient use.

As will be readily appreciated by those Specification of Letters Patent. Patented M31', 17, 1914,

- Application ledJuly 19, 1911.

suhciently skilled in the art, the tension in the spiral springs K may be increased by a forward turning-of the screw F, and the tendency of such springs to uncoil and occasion a reverse movement be mechanically precluded. Furthermore, by'reason or' the fact that the Worin-threaded portion e of the stud E is depressed Within its peripherical surface, this mechanical preclusion is found applicable also as against any tendency of the stud to move in the direction oi' its oWn axis.

Having fully described my invention, what l claim and desire to secure by Letters Patent is 1. A brushholder comprising a bracket having a plain opening, a brush inovably s-ecured to said bracket, a stud rotatably mounted in said opening and provided therein With a Worm-threaded portion, such portion beingdepressed Within the peripherioalsurface, a spiral spring; secured to said stud and having its free end bearing;

:nomme against said brush, and means comprisin a screw in mesh with such Worm-three ed portion and adapted to adjust said stud.

2. ln a brush-holder, an arm provided with a plain transverse bore or opening, a cylindrical stud mounted in said openin as a bearing, that portion of said stud Wit. in said opening bein provided with Wormwheel threads; said arm being provided with a second plain opening or bore intersecting said v{irst named opening or bore; a Worm screw loosely mounted in said second opening or bore and engaging the threads of vsaid stud; and two spiral springs having their inner` ends secured respectively to op posite ends or said stud, the opposite en s of said springs being adapted to bear upon the brusl Signed by me, this 17th day of July, 191.1.

JOHN C. LINCOLN.

Attested by- CURT B. MUELLER l/VINIFRED FLEMING.

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