US3700970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current circuit breaker
Assignee: Fuji Electric Co Ltd
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Filing: 1971-02-18
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Granted: 1972-10-24
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Expires: 1991-02-18
Abstract
Abstract The electrical energy for detonating an explosive in a circuitopening mechanism of a current circuit breaker to cut a circuit path is derived through a current transformer from the circuit path to which the circuit breaker itself is connected. The circuit-opening mechanism can thereby be exploded to cut the circuit path without the necessity of supplying electrical energy from any outside agency other than the circuit path. Furthermore, rapid extinguishing of the arc generated by the circuit path cutting is afforded by an insulative medium blown against the arc by the explosion, and the path parts thus cut apart are prevented by a unique construction from recontacting to remake the circuit.
Inventors
- 👤 Noriomi Miyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:27
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/10; H01H9/106; H01H39/00; H01H39/006; H02; H02H; H02H3/00; H02H3/02; H02H3/021; H02H3/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
146 words
A circuit breaker comprising, in combination, a circuit opening part to be opened by the explosive energy of an electrically ignitable explosive, a current transformer means comprising a primary conductor coupled to one pole of said circuit opening part and a secondary winding, a portion of said secondary said winding being connected to said primary conductor so as to have the same potential as said primary conductor relative to ground, a secondary current being induced in said secondary winding by the current passing through said primary conductor, and current detecting means maintained at the same potential relative to ground as said circuit opening part and being operative when said secondary current reaches a predetermined value to supply an igniting current to the explosive of said circuit opening part, said secondary current of said current transformer being the sole source for supplying igniting energy to said explosive.
Claim 2
Dependent Claim
146 words
A circuit breaker comprising, in combination, a circuit opening part to be opened by the explosive energy of an electrically ignitable explosive, a current transformer means comprising a primary conductor coupled to one pole of said circuit opening part and a secondary winding, a portion of said secondary said winding being connected to said primary conductor so as to have the same potential as said primary conductor relative to ground, a secondary current being induced in said secondary winding by the current passing through said primary conductor, and current detecting means maintained at the same potential relative to ground as said circuit opening part and being operative when said secondary current reaches a predetermined value to supply an igniting current to the explosive of said circuit opening part, said secondary current of said current transformer being the sole source for supplying igniting energy to said explosive.
Claim 3
Dependent Claim
21 words
A circuit breaker as defined in claim 1, further comprising a fuse means connected in parallel to said circuit opening part.
Claim 4
Dependent Claim
98 words
A circuit breaker as defined in claim 1 in which said circuit opening part comprises a unitary member and a contacting member means for guiding a portion adapted to be broken from said circuit opening part upon explosion of said explosive, said explosive imparting kinetic energy to said broken part whereby one end of said broken part travels into said contacting member, said contacting member further including a means for deforming said one end of said broken circuit part and holding said broken part within said contacting member to thereby sustain the opened state of the circuit path.
Claim 5
Dependent Claim
99 words
A circuit breaker as defined in claim 1 further including a fuse means connected in parallel to said circuit opening part, and a contacting member means for guiding a portion broken from said circuit opening part upon the explosion of said explosive and for deforming and holding said broken portion, said broken portion being deformed at its end in its terminal position in said contacting member by the kinetic energy imparted to said broken portion by said explosive, said deformation holding said broken part within said contacting member means and thereby sustaining the opened state of said circuit path.
Claim 6
Dependent Claim
77 words
A current circuit breaker as defined in claim 1 in which electric path structure of said circuit opening part is adapted to be broken and cut by said explosive energy and contains an electrically insulative substance having fluidity and defining a medium for transmitting the explosive energy of said explosive and being blown thereby when said structure is thus broken and cut against an arc which is generated at said circuit part thereby to extinguish said arc.
Claim 7
Dependent Claim
95 words
A current circuit breaker as defined in claim 1 in which fuse means are connected in parallel to said circuit opening part and in which electric path structure of said opening part is adapted to be broken and cut by the explosive energy of said explosive and contains an electrically insulative substance having fluidity and functioning as a medium for transmitting the explosive energy of said explosive and being blown thereby when said circuit part is thus broken and cut against an arc which is generated at said circuit part, therey to extinguish said arc.
Claim 8
Dependent Claim
107 words
A current circuit breaker as defined in claim 1, wherein said circuit opening part includes electric path structure which is adapted to be broken and cut by said explosive and comprises a conductor of round-bar shape having an external stepped shoulder and thereby having a large-diameter part, and a sealable cavity formed within said large-diameter part in the axial direction thereof with a configuration such that the wall thickness of said shoulder is relatively small, a capsule containing an explosive being installed within said cavity. 8. A current circuit breaker as defined in claim 7, further including fuse means connected in parallel to said circuit opening part.
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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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |