Patent US3609428A successfully refreshed from Google Patents.
US3609428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamo electric machine having improved slipring assembly
Assignee: Individual
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Filing: 1970-01-09
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Granted: 1971-09-28
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Expires: 1990-01-09
Abstract
Abstract This invention relates to dynamo electric machines. The dynamo electric machine includes a frame which supports a pair of bearings. A rotor shaft is journaled for rotation in the bearings, and carries a rotor assembly. A slipring assembly is also carried by the rotor shaft, and a brush assembly is provided, the brushes of which engage the slipring assembly. One end of the rotor shaft extends beyond one of the bearings, and is formed with an axial bore. The slipring assembly includes an integral spigot which is engaged as an interference fit in the bore in the rotor shaft, the spigot serving to support the slipring assembly on the rotor shaft so that the slipring assembly rotates with the rotor shaft. The slipring assembly is electrically connected to the rotor windings by way of leads which extend through the bearing, and so rotate with the shaft.
Inventors
- 👤 Herbert John Thomas Cotton
- 👤 Robert Hemmings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:38
CPC Classifications
H; H02; H02K; H02K13/00; H02K13/003; H02K11/00; H02K11/04; H02K11/049; H02K11/05; H02K5/00; H02K5/04; H02K5/14; H02K5/141; H10; H10W; H10W90/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
A dynamo electric machine, including, a frame supporting a pair of bearings, a rotor shaft journaled for rotation in said bearings, and carrying a rotor assembly, one end of said rotor shaft extending beyond one of said bearings, and carrying a slipring assembly, there being a brush assembly supported by the frame of the machine, the brushes of the brush assembly engaging said slipring assembly, said one end of said rotor shaft being formed with an axial bore of generally cylindrical form, and said slipring assembly including a spigot which is engaged in said bore to retain said slipring assembly on said shaft, said spigot being so shaped that at least one passage is defined between the spigot and the wall of the bore in the rotor shaft, at least one of the connecting leads of the slipring assembly extending through said bearing within said passage.
Claim 2
Dependent Claim
146 words
A dynamo electric machine, including, a frame supporting a pair of bearings, a rotor shaft journaled for rotation in said bearings, and carrying a rotor assembly, one end of said rotor shaft extending beyond one of said bearings, and carrying a slipring assembly, there being a brush assembly supported by the frame of the machine, the brushes of the brush assembly engaging said slipring assembly, said one end of said rotor shaft being formed with an axial bore of generally cylindrical form, and said slipring assembly including a spigot which is engaged in said bore to retain said slipring assembly on said shaft, said spigot being so shaped that at least one passage is defined between the spigot and the wall of the bore in the rotor shaft, at least one of the connecting leads of the slipring assembly extending through said bearing within said passage.
Claim 3
Dependent Claim
52 words
A machine as claimed in claim 1 wherein said bore is of circular cross section and said spigot is of cruciform cross section so as to define four passages with the wall of said bore, two connecting leads of the slipring assembly extending through said bearing within two of said passages respectively.
Claim 4
Dependent Claim
17 words
A machine as claimed in claim 1 wherein said slipring assembly is an end face slipring assembly.
Claim 5
Dependent Claim
56 words
A machine as claimed in claim 1 wherein said spigot is an interference fit in said axial bore, and there is provided a spring clip which engages said spigot and the wall of said bore, and aids the interference fit between the spigot and the wall of the bore in retaining the slipring assembly in position.
Claim 6
Dependent Claim
135 words
A dynamo electric machine including a frame supporting a pair of bearings, a rotor shaft journaled for rotation in the bearings and carrying a rotor assembly, one end of said rotor shaft extending beyond one of said bearings, and carrying a slipring assembly, there being a brush assembly supported by the frame of the machine, the brushes of the brush assembly engaging said slipring assembly, said one end of said rotor shaft being formed with an axial bore of generally cylindrical form, and said slipring assembly including a spigot which is engaged in said bore to retain said slipring assembly on said shaft, said spigot being so shaped that at least one passage is defined between the spigot and the wall of the bore in the rotor shaft, at least in accordance with said output.
Claim 7
Dependent Claim
135 words
A dynamo electric machine including a frame supporting a pair of bearings, a rotor shaft journaled for rotation in the bearings and carrying a rotor assembly, one end of said rotor shaft extending beyond one of said bearings, and carrying a slipring assembly, there being a brush assembly supported by the frame of the machine, the brushes of the brush assembly engaging said slipring assembly, said one end of said rotor shaft being formed with an axial bore of generally cylindrical form, and said slipring assembly including a spigot which is engaged in said bore to retain said slipring assembly on said shaft, said spigot being so shaped that at least one passage is defined between the spigot and the wall of the bore in the rotor shaft, at least in accordance with said output.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |