Patent US767782A successfully refreshed from Google Patents.
Patent US4663605A successfully refreshed from Google Patents.
US4663605A
Expired / Lapsed
US
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Clamping means for the core and coil assembly of an electric transformer
Assignee: Electric Power Research Institute
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Filing: 1986-07-15
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Granted: 1987-05-05
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Expires: 2006-07-15
Abstract
Abstract This transformer comprises a generally rectangular core having two yokes and two legs connecting the yokes, with joints located in one of the yokes. Coil structures surround the two legs. Flexible banding under tension applies clamping forces to two clamping plates spaced outwardly from the yokes, and these clamping forces are transmitted to the coil structures by paths bypassing the core. The banding extends alongside the legs and is oriented so as to engage the core at opposite ends of said one yoke but so as to be spaced from the core at opposite ends of the other yoke.
Inventors
- 👤 Albert C. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:02
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/26; H01F27/263; H01F27/28; H01F27/30; H01F27/303
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
198 words
In an electric transformer, (a) a laminated core primarily of amorphous ferromagnetic alloy having two spaced-apart yokes and two spaced-apart legs at opposite ends of said yokes, (b) two coil structures respectively surrounding said legs, each coil structure having a passageway through which one of said legs extends, (c) one of said yokes having joints therein which are used to allow for opening of said core during lacing of the core into said coil structures, (d) clamping plates at the yoke ends of said core and spaced outwardly from said yokes, (e) means for applying clamping forces to said plates to urge the plates together, (f) force-transmitting members between said clamping plates and said coil structures for transmitting said clamping force to said coil structures by paths bypassing said core, (g) said means for applying clamping forces comprising flexible banding that extends through said coil passageways alongside said legs, is held under tension, and engages said core at opposite ends of said one yoke to exert forces on said one yoke acting longitudinally thereof, and (h) said flexible banding being oriented so as to be spaced from said core at opposite ends of the other of said yokes.
Claim 2
Dependent Claim
198 words
In an electric transformer, (a) a laminated core primarily of amorphous ferromagnetic alloy having two spaced-apart yokes and two spaced-apart legs at opposite ends of said yokes, (b) two coil structures respectively surrounding said legs, each coil structure having a passageway through which one of said legs extends, (c) one of said yokes having joints therein which are used to allow for opening of said core during lacing of the core into said coil structures, (d) clamping plates at the yoke ends of said core and spaced outwardly from said yokes, (e) means for applying clamping forces to said plates to urge the plates together, (f) force-transmitting members between said clamping plates and said coil structures for transmitting said clamping force to said coil structures by paths bypassing said core, (g) said means for applying clamping forces comprising flexible banding that extends through said coil passageways alongside said legs, is held under tension, and engages said core at opposite ends of said one yoke to exert forces on said one yoke acting longitudinally thereof, and (h) said flexible banding being oriented so as to be spaced from said core at opposite ends of the other of said yokes.
Claim 3
Dependent Claim
67 words
The transformer assembly of claim 1 in which: (a) said one yoke has rounded ends about which said banding is wrapped, and (b) said legs have substantially vertical outer surfaces closely adjacent which said banding extends in passing through said passageways, (c) said banding is disposed at an angle of between 0° and +6° to the adjacent outer leg surface at the ends of said one yoke.
Claim 4
Dependent Claim
33 words
The transformer assembly of claim 2 in which said banding is disposed at an angle of between 0° and +3° to the adjacent outer leg surface at the ends of said one yoke.
Claim 5
Dependent Claim
53 words
The transformer assembly of claim 1 in which: (a) said legs have substantially vertical outer surfaces closely adjacent which said banding extends in passing through said passages, (b) said banding is disposed at an angle of between 0° and -6° to the juxtaposed outer leg surface at the ends of said other yoke.
Claim 6
Dependent Claim
33 words
The transformer assembly of claim 2 in which said banding as disposed at an angle of between 0° and -6° to the juxtaposed outer leg surface at the ends of said other yoke.
Claim 7
Dependent Claim
33 words
The transformer assembly of claim 2 in which said banding is disposed at an angle of between 0° and -2° to the juxtaposed outer leg surface at the ends of said other yoke.
Claim 8
Dependent Claim
33 words
The transformer assembly of claim 3 in which said banding is disposed at an angle of between 0° and -2° to the juxtaposed outer leg surface at the ends of said other yoke.
Claim 9
Dependent Claim
46 words
The transformer assembly of claim 1 in which: (a) said core includes an outer wrapper having a thickness that is much greater than that of the amorphous metal laminations of the core, and (b) said banding contacts said wrapper at the ends of said one yoke.
Claim 10
Dependent Claim
55 words
The transformer assembly of claim 2 in which: (a) said core includes an outer wrapper extending about its outer periphery and having a thickness that is much greater than that of the amorphous metal laminations of the core, and (b) said wrapper is contacted by said banding at the rounded ends of said one yoke.
Claim 11
Dependent Claim
196 words
In an electric transformer, (a) a laminated core of ferromagnetic alloy having two spaced-apart yokes and two spaced-apart legs at opposite ends of said yokes, (b) two coil structures respectively surrounding said legs, each coil structure having a passageway through which one of said legs extends, (c) one of said yokes having joints therein which are used to allow for opening of said core during lacing of the core into said coil structures, (d) clamping plates at the yoke ends of said core and spaced outwardly from said yokes, (e) means for applying clamping forces to said plates to urge the plates together, (f) force-transmitting members between said clamping plates and said coil structures for transmitting said clamping forces to said coil structures by paths bypassing said core, (g) said means for applying clamping force comprising flexible banding that extends through said coil passageways alongside said legs, is held under tension, and engages said core at opposite ends of said one yoke to exert forces on said one yoke acting longitudinally thereof, and (h) said flexible banding being oriented so as to be spaced from said core at opposite ends of the other of said yokes.
Claim 12
Dependent Claim
196 words
In an electric transformer, (a) a laminated core of ferromagnetic alloy having two spaced-apart yokes and two spaced-apart legs at opposite ends of said yokes, (b) two coil structures respectively surrounding said legs, each coil structure having a passageway through which one of said legs extends, (c) one of said yokes having joints therein which are used to allow for opening of said core during lacing of the core into said coil structures, (d) clamping plates at the yoke ends of said core and spaced outwardly from said yokes, (e) means for applying clamping forces to said plates to urge the plates together, (f) force-transmitting members between said clamping plates and said coil structures for transmitting said clamping forces to said coil structures by paths bypassing said core, (g) said means for applying clamping force comprising flexible banding that extends through said coil passageways alongside said legs, is held under tension, and engages said core at opposite ends of said one yoke to exert forces on said one yoke acting longitudinally thereof, and (h) said flexible banding being oriented so as to be spaced from said core at opposite ends of the other of said yokes.
Claim 13
Dependent Claim
67 words
The transformer assembly of claim 10 in which: (a) said one yoke has rounded ends about which said banding is wrapped, and (b) said legs have substantially vertical outer surfaces closely adjacent which said banding extends in passing through said passageways, (c) said banding is disposed at an angle of between 0° and +6° to the adjacent outer leg surface at the ends of said one yoke.
Claim 14
Dependent Claim
33 words
The transformer assembly of claim 11 in which said banding is disposed at an angle of between 0° and +3° to the adjacent outer leg surface at the ends of said one yoke.
Claim 15
Dependent Claim
53 words
The transformer assembly of claim 10 in which: (a) said legs have substantially vertical outer surfaces closely adjacent which said banding extends in passing through said passages, (b) said banding is disposed at an angle of between 0° and -6° to the juxtaposed outer leg surface at the ends of said other yoke.
Claim 16
Dependent Claim
33 words
The transformer assembly of claim 11 in which said banding is disposed at an angle of between 0° and -6° to the juxtaposed outer leg surface at the ends of said other yoke.
Claim 17
Dependent Claim
33 words
The transformer assembly of claim 12 in which said banding is disposed at an angle of between 0° and -2° to the juxtaposed outer leg surface at the ends of said other yoke.
Claim 18
Dependent Claim
50 words
The transformer assembly of claim 10 in which: (a) said banding is of metal and makes good electrical contact with said core at at least one of the locations that the banding engages the core, and (b) said banding is electrically connected to ground so as to ground said core.
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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |