Patent US3725832A successfully refreshed from Google Patents.
US3725832A
Expired / Lapsed
US
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Magnetic core structure
Assignee: SCHWERTZER E Mfg CO Inc
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Filing: 1971-10-12
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Granted: 1973-04-03
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Expires: 1991-10-12
Abstract
Abstract A circular magnetic core structure comprises a plurality of laminations of prestressed oriented silicon steel secured together near their juxtaposed ends which are biased into mutual engagement and are separable to receive an alternating current carrying conductor to induce into the core alternating magnetic flux which induces alternating current into a coil on the core corresponding to the current in the conductor. The core and coil are encapsulated in insulating material. In one embodiment self curing cement is applied to the juxtaposed ends after the core is applied to the conductor to seal them together. In another embodiment the ends are provided with interlocking separable coupling extensions of corrosion resisting magnetic material.
Inventors
- 👤 E Schweitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:18
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0233; H01F41/024; G; G01; G01R; G01R15/00; G01R15/14; G01R15/18; G01R15/183; H01F38/00; H01F38/20; H01F38/22; H01F38/28; H01F38/30; H01F38/305
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
105 words
For combination with an alternating current carrying conductor a magnetic core having a secondary winding thereon, said core comprising: a plurality of circular strips of magnetic material individually prestressed radially inwardly and not subsequently annealed, capable of being endwise opened to admit said conductor and to be biased closed by said prestress with the ends of said strips juxtaposed, and having clearance, when biased closed, between adjacent strips at the portions thereof opposite said ends to increase the flexibility thereof, and means securing said ends of said strips together, said core being characterized by being repeatedly openable for application to and removal from said conductor.
Claim 2
Dependent Claim
105 words
For combination with an alternating current carrying conductor a magnetic core having a secondary winding thereon, said core comprising: a plurality of circular strips of magnetic material individually prestressed radially inwardly and not subsequently annealed, capable of being endwise opened to admit said conductor and to be biased closed by said prestress with the ends of said strips juxtaposed, and having clearance, when biased closed, between adjacent strips at the portions thereof opposite said ends to increase the flexibility thereof, and means securing said ends of said strips together, said core being characterized by being repeatedly openable for application to and removal from said conductor.
Claim 3
Dependent Claim
20 words
The magnetic core and secondary winding according to claim 1 wherein said core and winding are encapsulated in insulating material.
Claim 4
Dependent Claim
22 words
The magnetic core and secondary winding according to claim 1 wherein separable coupling means extend laterally from said ends of said strips.
Claim 5
Dependent Claim
19 words
The magnetic core and secondary winding according to claim 3 wherein said coupling means comprises tongue and groove means.
Claim 6
Dependent Claim
20 words
The magnetic core and secondary winding according to claim 3 wherein said coupling means is formed of corrosion resisting metal.
Claim 7
Dependent Claim
21 words
The magnetic core and secondary winding according to claim 5 wherein said corrosion resisting metal is relatively high permeability nickel iron.
Claim 8
Dependent Claim
24 words
The magnetic core and secondary winding according to claim 5 wherein said coupling means have saturable sections to limit induction in said secondary winding.
Claim 9
Dependent Claim
92 words
For combination with an alternating current carrying conductor a magnetic core having a secondary winding thereon, said core comprising: a plurality of circular strips of prestressed magnetic material capable of being endwise opened to admit said conductor and to be biased closed with the ends of said strips juxtaposed, means securing said ends together including separable coupling means extending laterally from said ends of said strips, said coupling means including tongue and groove means, said tongue means including a circular end having a snap fit with a pocket on said groove means.
Claim 10
Dependent Claim
92 words
For combination with an alternating current carrying conductor a magnetic core having a secondary winding thereon, said core comprising: a plurality of circular strips of prestressed magnetic material capable of being endwise opened to admit said conductor and to be biased closed with the ends of said strips juxtaposed, means securing said ends together including separable coupling means extending laterally from said ends of said strips, said coupling means including tongue and groove means, said tongue means including a circular end having a snap fit with a pocket on said groove means.
Claim 11
Dependent Claim
140 words
For combination with an alternating current carrying conductor a magnetic core having a secondary winding thereon, said core comprising: a plurality of circular strips of prestressed magneTic material capable of being endwise opened to admit said conductor and to be biased closed with the ends of said strips juxtaposed, means securing said ends together including separable coupling means extending laterally from said ends of said strips, said coupling means including tongue and groove means, said tongue means including a circular end having a snap fit with a pocket on said groove means, and insulating material encapsulating said core and winding, those portions of the encapsulated core at the ends of the encapsulated winding on the outer side of the former being spaced from the latter to increase the flexibility of said core in separating said ends to admit said conductor.
Claim 12
Dependent Claim
140 words
For combination with an alternating current carrying conductor a magnetic core having a secondary winding thereon, said core comprising: a plurality of circular strips of prestressed magneTic material capable of being endwise opened to admit said conductor and to be biased closed with the ends of said strips juxtaposed, means securing said ends together including separable coupling means extending laterally from said ends of said strips, said coupling means including tongue and groove means, said tongue means including a circular end having a snap fit with a pocket on said groove means, and insulating material encapsulating said core and winding, those portions of the encapsulated core at the ends of the encapsulated winding on the outer side of the former being spaced from the latter to increase the flexibility of said core in separating said ends to admit said conductor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |