Patent US3976903A successfully refreshed from Google Patents.
US3976903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slip ring assembly for A.C. machines
Assignee: Lucas Electrical Co Ltd
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Filing: 1975-04-30
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Granted: 1976-08-24
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Expires: 1995-04-30
Abstract
Abstract A slip ring assembly for an a.c. machine comprises a pair of copper rings mounted on an electrically insulating sleeve formed of two arcuate portions, each of which extends for less than the true semi-circle so that the sleeve is not a true cylinder of circular cross-section. Means internally of the sleeve urges the arcuate portions outwardly when the sleeve is mounted on a rotor shaft of the a.c. machine so as to retain the rings in position on the sleeve. The means may be in the form of a separate, split cylindrical spring or in the form of a taper on the inner surface of the sleeve which engages a corresponding taper on the rotor shaft.
Inventors
- 👤 Herbert John Thomas Cotton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:41
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/08; H01R39/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
56 words
A slip ring assembly for an a.c. machine, comprising an electrically insulating sleeve formed of a plurality of arcuate portions, a pair of electrically conducting rings mounted on said sleeve, and a separate resilient member internally of said sleeve urging said arcuate portions thereof outwardly so as to retain said rings in position on said sleeve.
Claim 2
Dependent Claim
56 words
A slip ring assembly for an a.c. machine, comprising an electrically insulating sleeve formed of a plurality of arcuate portions, a pair of electrically conducting rings mounted on said sleeve, and a separate resilient member internally of said sleeve urging said arcuate portions thereof outwardly so as to retain said rings in position on said sleeve.
Claim 3
Dependent Claim
17 words
The slip ring assembly according to claim 1, wherein said resilient member comprises a split cylindrical spring.
Claim 4
Dependent Claim
42 words
The slip ring assembly according to claim 2, wherein at least one tang is provided on said split cylindrical spring, and at least one detent is provided in the inner surface of said sleeve in which said at least one tang engages.
Claim 5
Dependent Claim
22 words
The slip ring assembly according to claim 3, wherein two tangs are provided, one at each end of said split cylindrical spring.
Claim 6
Dependent Claim
15 words
The slip ring assembly according to claim 4, wherein said two tangs are axially aligned.
Claim 7
Dependent Claim
36 words
The slip ring assembly according to claim 1, wherein internal projections are provided on said resilient member to engage a rotor shaft of said a.c. machine when said slip ring assembly is mounted thereon in use.
Claim 8
Dependent Claim
30 words
The slip ring assembly according to claim 1, wherein recesses are provided in the outer and inner surfaces of said sleeve to locate said rings and said resilient member, respectively.
References Cited (Backward Citations)
US2248759A
Cited
FR940370A
Cited
US2718604A
Cited
US2954492A
Cited
US3265914A
Cited
US3636394A
Cited
US3842301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |