US1277497A - Brush-holder. - Google Patents

Description

C. W. STARKER 6: G. L` S. KRONFELD.

BRUSH Home.

APPLICATON FILED JUNE 30. |915. 1 ,277,497. Patented Sept. 3, 1918.

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C. W. STARKER & G. L. S. KRONFELD.

BRUSH Howes.

APPLICATION FILED )UNE 3051915.

Patented Sept. 3, 1918.

2 SHEETS-SHED` 2.

' l ATTORNEY UNITED sTATEs PATENT oEEIoE.

CHARLES W. STARKER, OF PITTSBURGH, AND GUSTAV L. S. TKRONFlEIIiD,V OF WILKINS- BURG, PENNSYLVANIA, .ASSIGNORS TO WESTINGHOSE ELECTRIC AND MANUFAC- TURIN Gr COMPANY, A CORPORATION 0F PENNSYLVANIA. y

BRUSH-HOLDER.

To all whom t may concern:

Be it known that we,'CrrAnLEs W. STARKER, a subject of the Emperor of Germany, and a resident oi Pittsburgh, in 'thecounty of Allegheny and State of Pennsylvania, and GUsTAv L. S. KnoNrELD, a subject of the King` of Great Britain, and a resident of lVilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and luseful Improvement in Brush- Holders, of which the following is a specification. f

Our invention relates to current-collecting` devices for dynamo-electric machines and it has for its object to provide a device or' the character specified thatA shall be particularly simple and inexpensive in construction and reliable in operation.

According to the present invention, we provide a current-collecting device or brush holder, the body portion of which is formed entirely of pressed metal. Furthermore, we provide a brush holder that is equipped with a plurality of readily adjustable resilient members for engaging the current-collectingmembers or brushes. n

In the accompanying drawings, Figure 1 is a plan view `of a `brush. holder constructed in accordance with oury invention; Fig. 2 is a view, in side elevation, of the brush holder shown in Fig. 1; Fig. 3 is a plan view of the pressed metal body portion of the brush holder; 4 is ay view, partially in section and partially in front elevation7 of the body portion shown in Fig. 3; Fig. 5 is Y a view, in side elevation, of the body portion shown in Fig. 3;'Fig. 6 isa sectional view along the line II-II of Fig. l, showing the brush-,retaining means; Fig. 7* is a' sectional view along the line IV-IV of Fig. 6, and Fig. 8 comprises two detail views of the brush contact hammer.V

A currentcollecting device vror brush holder 1 comprises a body member `2 anda brushbox member 3 that is secured to the body member 2v by rivets 4er any other suitable means. Asbest shown in Figs. 3, 4 and 5, the body member 2 comprises la ldishshapedL portion 5 and a pair ofroppositely disposed vand laterally extending pockets 6.'

The pockets 6 are formed integral with the side walls of the dish-shapedy portion 5 and are approximately circular in form. Each of the pockets yt `is provided with a central Specification of Letters Patent.

Patentedy Sept. 3, 1918.

Application filed June 30, 1915. Serial No. 37,231.

opening 7 and a substantially annular `flange 8 surrounding the opening. Each of two supporting rods 9 is provided with an enlarged portion 10 and with athreaded :ex-k

'through the openings 7. Nuts 12 coact with the threaded extensions 11 to secure the eul'arged portions 10 within the pockets 6. The'supporting rods 9 are adapted to be secured to the ,irame of a dynamo-electric machine in any suitablel manner and are insulated therefronrby an insulating bushing 13 and aninsulating sleeve 14, as best shown in Fig. 2. It is evident thatthe brush holders may be removed readily yfrom their supporting rods 9 without removing the rods from the frame oit the dynamo-electric machine. f i

The brush holder 1 is .further provided with a current-collecting member orbrush 15 `that is adapted to slide within the brush box 3 and with pressure devices 16 to maintain the brush 15 in operative engagement with a commutator cylinder 17. As best shown in Figs. 6 and 7, the devices 16 comprise springs 18 and spring guides 19 of substantially a U-shape cross-section. The

`innermost turns of the springs 18 terminate in 4straight portions 20 and are secured with in a Slot 21 in a shaft 22. The shaft 22 is rotatably mounted in suitable openings 23 in the side walls of the body member 2 and is supported, at a .point intermediate the openings 23, by a bracket 24. The bracket 24 comprises a base portion 25 secured to the bottom of the dish-shaped portion 5 by rivets 25a, or in any other suitable manner, andk an upwardly extending portion 26. The portion 26 is provided with an opening 27 to receive the shaft 22. A ratchet wheel 28 is rigidly secured to the shaft 22 by means of a cotter pin 29 which engages registering'holes in theratchet wheel hubr 30 and the shaft 22. A jpawl 32 :ispivotally mounted on the upwardly extending portion 26 of the bracket 24 and is adapted to engage the teeth 33 of the ratchet wheel 28. The pawl 32 is provided with extension 3i that projects abovethe walls of the portion 5 and which may be utilized to disengage the pawl from the teeth 33 of the ratchet wheel 28. The hub 3001:' the ratchet comprise finger portions 38 thatterminate in approximately semi-circular extensions 39. The outermostturns of the spring members 18 are extended to form linger portions Je() which terminate in approximately semicircular port-ions il that are oppositely disposed with respect to the portions 39. As best shown in Fig. 2, flexible conductors l2 are secured to an upwardly extending portion 43 of the brush holder body member?, and are disposed along the under sides of the U-shape guide members 19. The flexible conductors 42 terminate adjacent the semicircular portions 39 and 41 and the latter are engaged by a clip 44. As best shown in Fig. 8, the clip 4.-/.t comprises cylindrically curved portions 45 and laterally extending portions A6. The portions 45 embrace the portions 39 and 11 and the flexibleconductor /T'Q and thereby form a substantially unitary structure. The clip 44 is preferably formed of material having high electrical conductivity so that current may be taken from the brush 15 and through the flexible conductor 42 with relatively little heating of the spring members 18.

From the foregoing, it is apparent that a pressed metal brush holder constructedvin accordance with my invention may -be readily removed from its supporting rods. Furthermore, by having a single ratchetandpawl mechanism for controlling the tension of the brush-retaining members, the amount of pressure exerted upon the brushes will always be kept constant and may be easily adjusted.

While We have shown our invention in a suitable and preferred form, it is not so limited but is susceptible of various minor changes and modifications within the scope of the appended claims.

We claim as our invention:

1. A brush holder embodying a one-piece body member comprising a dish-shaped portion having the midportion of its oppositely disposed side walls bent outwardly to form a plurality of pockets. i r

2. A brush holder comprising a body portion provided with laterally extending and approximately cylindrical pockets having central apertures, supporting rodsextendiug through the said apertures and' provided with enlarged portions seated within the said pockets and portions projecting beyondr said pockets, 4and retaining members coacting with said projecting portions.

Aciirrentrollecting device comprising a dish-shaped body member, lcurrent-collecting members carried thereby, a shaft mounted at its ends in the walls of said body member, resilient members for engaging said.,ernment-collecting members mounted in side-by-side relation on said shaft, a ratchet wheel carried by said shaft between said resilient members and an adjusting pawl mounted on `-anupwardly `extending projection of`said body member and having an operating portion projecting above the walls of said body member.

4. A current-collecting device comprising a dish-shaped body member, current-collecting members carried thereby, ashaft mounted at its ends in' the walls ofsaid body member, resilient members for engaging said current-collecting members mounted in sideby-side `relation on said shaft,A a ratchet wheel carried by said shaft between said resilient members, an upwardly extending bracket forsaidshaft locatedadjacent to said ratchet wheel and an adjusting pawl pivotall'y mounted on `said bracket and having an operating portion projecting above the walls of said body member andbetween said resilient members. 7

45. A current-collecting device comprisinga current-'collecting member, a holding member therefor, a shaft, a resilient member for engaging said current-collecting member mounted on said shaft, a guide member rotatably mounted `on said shaft and e1nbrac ing said resilient member, the said resilient memberhand the said -guide memberfrespectively .terminating in oppositely. disposed semi-cylindrical portions and means forsecuring said portions together.

' G. lA `current-collecting device comprising a current-collectingmember, a holding member therefor, a shaft, Va resilient membervfor engaging said currentcollecting member mounted on said shaft, a guidemember rotatably mounted on said shaft Iand embracing `said resilient memberythe said resilient member 'and the said guide member respectively terminating in oppositely disposed semi-cylindricalportions and a cylindrically curved Contact tip surrounding said portions and securing them together.

7. A current-collecting device comprising a current-collecting member@ kholding membertherefor,-a shaft,"a resilient member for engaging said 'current-collecting member mounted onisaid shaft, a guide member for said ,resilient member, and a fiexible conductor'securedfat-one end tolsaid holding member and'having a portion thereof car# ried by said guide member. Y

8. A current-collecting device comprising aV current-collecting member, a holding member therefor, a shaft, aresilient member for engaging said current-collecting member mounted on said shaft, a U-shaped guide member, the arms of which embrace said resilient member and a flexible conductor scoured at one end to said holding member and having a portion thereof located between the arms of said guide member. y

9. A current-collecting device comprising a current-collecting member, a holding meme ber therefor, a shaft, a resilient member for engaging said current-collecting member mounted on said shaft, a guide member rotatably mounted on said shaft and embracing said resilient member, the said resilient member and the said guide member respectively terminating in oppositely disposed semi-cylindrical portions, and a flexible conductor secured at its ends to said holding member and between said semi-cylindrical portions, respectively, and having a portion thereof carried by'said guide member.

l0. A brush-holder embodying a one-piece body member comprising a dish-shaped portion having its oppositely disposed side walls projecting outwardly to form a plurality 0f pockets, each having cylindrical side walls and a bottom and being laterally disposed with respect to the said body member.

In testimony whereof we have hereunto subscribed our names this 21st day of June, 1915.

CHARLES W. STARKER. GUSTAV L. S. KRONFELD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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