US4521760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miniaturized circuit breaker
Assignee: Control Devices LLC
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Filing: 1983-09-19
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Granted: 1985-06-04
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Expires: 2003-09-19
Abstract
Abstract A circuit breaker comprises a two piece metal enclosure, a cover and a base. Disposed within the enclosure is a PMB bimetal which is fastened to a step in the cover. The opening time of the circuit breaker can be adjusted by means of the step.
Inventors
- 👤 Douglas C. Carbone
- 👤 Philip J. Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:16
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/12; H01H37/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
162 words
A circuit breaker comprising: a two piece metal enclosure, the two metal pieces thereof being electrical terminals and being insulated from each other, one of the metal pieces being a base and the other being a cover, the cover having a step at one end thereof; and a PMB bimetal disposed within the enclosure, the PMB bimetal comprising a cantilever section and a U shaped segment, the U shaped segment having a short leg and a long leg, one end of the cantilever section being fastened to the step, and the other end of the cantilever section being fastened to the short leg of the U shaped segment, and a contact fastened to the long leg of the U shaped segment for making electrical contact with a fixed contact fastened to the base, the cantilever section comprising a high expansion layer and a low expansion layer, the high expansion layer being in contact with the step at the end of the cover.
Claim 2
Dependent Claim
162 words
A circuit breaker comprising: a two piece metal enclosure, the two metal pieces thereof being electrical terminals and being insulated from each other, one of the metal pieces being a base and the other being a cover, the cover having a step at one end thereof; and a PMB bimetal disposed within the enclosure, the PMB bimetal comprising a cantilever section and a U shaped segment, the U shaped segment having a short leg and a long leg, one end of the cantilever section being fastened to the step, and the other end of the cantilever section being fastened to the short leg of the U shaped segment, and a contact fastened to the long leg of the U shaped segment for making electrical contact with a fixed contact fastened to the base, the cantilever section comprising a high expansion layer and a low expansion layer, the high expansion layer being in contact with the step at the end of the cover.
Claim 3
Dependent Claim
51 words
The circuit breaker of claim 1 wherein the inner surface of the U shaped segment comprises a high expansion layer and the outer surface thereof comprises a low expansion layer, the high expansion layer of the cantilever section being in contact with the low expansion layer of the U shaped segment.
References Cited (Backward Citations)
US3587022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |