US3628051A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact brush unit for an electrical machine, particularly for a slip-ring electrical machine
Assignee: Individual
•
Filing: 1970-02-12
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Granted: 1971-12-14
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Expires: 1990-02-12
Abstract
Abstract A contact brush unit comprises a device for replacement of a worn-out brush without stopping the operation of the machine. The device includes a sleeve, mounted around a brush holder and secured at one end to a current supply bar of the machine so that the portion of the brush holder, received inside the current supply bar, is pressed by the sleeve against this bar. The unit also includes a means for raising the brush selectively off the rotor contact member, e.g. a slip ring, such means being springmounted on the stem and freely passing through the other, opposite end of the sleeve, the last-mentioned end of the sleeve having an edge portion adapted to retain thereon the brushraising means in an abutted position, when the brush is to be replaced, whereby the sleeve and the brush holder can be jointly removed from the current supply bar during operation of the machine.
Inventors
- 👤 Alexandr Abramovic Chigirinshy
- 👤 Evgeny Khaimovich Glider
- 👤 Oleg Borisovich Gradov
- 👤 David Bentsionovich Kapnman
- 👤 Boris Leonidovich Konovalov
- 👤 Boris Bolkovich Spivak
- 👤 Vasily Semenovich Kildishev
- 👤 Ivan Eliseevich Makogonenko
- 👤 Ivan Terentievich Filipenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:14
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/38; H01R39/41
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
233 words
A contact brush unit for an electrical machine, particularly, for a slipring electrical machine, comprising: a brush; a stem having first and second ends, said first end being connected with said brush; spring means pressing said brush against contact means of the rotor of said electrical machine; a brush holder supporting said brush; a current supply bar engageable with said brush holder by receiving a portion of said holder therein; means for effecting replacement of said brush during operation of said machine including a sleeve made of an electrically insulating material mounted at least partly about said brush holder, said sleeve having a first end portion detachably connected to said current supply bar with adjustment so that said portion of said brush holder received in said current supply bar is pressed against said current supply bar by connection of the sleeve to said bar; and means for selective raising of said brush from the contact means of said rotor, the brush-raising means being made of an electrically insulating material and being spring-mounted on said stem, said sleeve having a second end portion through which said brush-raising means freely passes, said second end portion of said sleeve having means at the edge thereof to hold said brush-raising means thereon when said brush is to be replaced, whereby said sleeve and said brush holder can be separated as a unit from said current supply bar.
Claim 2
Dependent Claim
233 words
A contact brush unit for an electrical machine, particularly, for a slipring electrical machine, comprising: a brush; a stem having first and second ends, said first end being connected with said brush; spring means pressing said brush against contact means of the rotor of said electrical machine; a brush holder supporting said brush; a current supply bar engageable with said brush holder by receiving a portion of said holder therein; means for effecting replacement of said brush during operation of said machine including a sleeve made of an electrically insulating material mounted at least partly about said brush holder, said sleeve having a first end portion detachably connected to said current supply bar with adjustment so that said portion of said brush holder received in said current supply bar is pressed against said current supply bar by connection of the sleeve to said bar; and means for selective raising of said brush from the contact means of said rotor, the brush-raising means being made of an electrically insulating material and being spring-mounted on said stem, said sleeve having a second end portion through which said brush-raising means freely passes, said second end portion of said sleeve having means at the edge thereof to hold said brush-raising means thereon when said brush is to be replaced, whereby said sleeve and said brush holder can be separated as a unit from said current supply bar.
Claim 3
Dependent Claim
98 words
A brush unit as claimed in claim 1 wherein said brush holder has an end opposite said brush with a stop member thereat against which said brush-raising means abuts and is supported in the operative state of said contact brush unit, whereby to prevent accidental loosening of said sleeve with respect to said brush holder, a resilient means acting between said portion of said brush holder received in said supply bar and said sleeve to provide electrical contact between said current supply bar and said brush holder when said brUsh-raising means is retained in the operating position thereof.
Claim 4
Dependent Claim
20 words
A brush unit as claimed in claim 2 wherein said resilient means comprises an annular member encircling said brush holder.
Claim 5
Dependent Claim
50 words
A brush unit as claimed in claim 1 comprising an element on said stem which lowers together with said stem as said brush wears in operation, said element abutting against said brush-raising means when said brush is worn to a limited extent to prevent any further lowering of said brush.
Claim 6
Dependent Claim
56 words
A brush unit as claimed in claim 4 wherein said brush raising means comprise a turnable element which is slidable in said sleeve and is retracted from said sleeve and turned to engage the means at the edge of the sleeve to be held thereon and fixedly secure the said brush and holder in said sleeve.
Claim 7
Dependent Claim
31 words
A brush unit as claimed in claim 5 wherein said current supply bar is threaded to said sleeve, said brush holder including an external ring engageable by said current supply bar.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |