Patent US3818164A successfully refreshed from Google Patents.
US3818164A
Expired / Lapsed
US
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Vacuum type electric circuit breaker
Assignee: Toshiba Corp
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Filing: 1972-09-18
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Granted: 1974-06-18
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Expires: 1992-09-18
Abstract
Abstract A vacuum type electric circuit breaker includes a highly evacuated envelope of electric insulating material and a pair of relatively movable electrodes located in the envelope. At least one of the electrodes has a contact assembly at one end thereof, the contact assembly comprising first and second disc members in parallel. The first disc member being secured mechanically and electrically to the one end of the electrode at its center portion, and the second disc member having a peripheral portion secured to a corresponding peripheral portion of the first disc member. An electric contact is provided at the center area of the second disc member so as to make and break an electric circuit with an electric conductor of the other electrode. There is provided an electric current path in the contact assembly for containing a magnetic field surrounding an electric arc which is established between the contact assembly and the contact of the other electrode and for preventing the electric arc from the dispersion thereof when the electric circuit may be opened by the separation of the contacts.
Inventors
- 👤 H Mizutani
- 👤 O Morimiya
- 👤 S Soma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:38
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/664; H01H33/6643; H01H33/6644; H01H33/6646
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
198 words
A vacuum circuit breaker comprising: a highly evacuated envelope; a pair of co-acting electrodes located in the envelope to be relatively movable from a position of engagement to a position of disengagement to make a curcuit interruption; a contact assembly secured to at least one of said electrodes at one end thereof, said contact assembly including a pair of flat discs one of which has a center portion secured to one end of said electrode and the other of which has a contact region at its center area; said flat discs being electrically connected at the peripheral portion so as to make at least one current loop perpendicular to the axis of said electrode and directed from the center of one of said discs through the outer peripheral portion thereof and the outer peripheral portion of said other disc to the center thereof; whereby said current loop creates magnetic fluxes surrounding an electric arc which occurs between said electrodes during said circuit interruption; and wherein said one of said flat discs of said contact assembly is spirally cut to make a clockwise current pass, and said other flat disc is spirally cut to make a counter-clockwise current pass.
Claim 2
Dependent Claim
198 words
A vacuum circuit breaker comprising: a highly evacuated envelope; a pair of co-acting electrodes located in the envelope to be relatively movable from a position of engagement to a position of disengagement to make a curcuit interruption; a contact assembly secured to at least one of said electrodes at one end thereof, said contact assembly including a pair of flat discs one of which has a center portion secured to one end of said electrode and the other of which has a contact region at its center area; said flat discs being electrically connected at the peripheral portion so as to make at least one current loop perpendicular to the axis of said electrode and directed from the center of one of said discs through the outer peripheral portion thereof and the outer peripheral portion of said other disc to the center thereof; whereby said current loop creates magnetic fluxes surrounding an electric arc which occurs between said electrodes during said circuit interruption; and wherein said one of said flat discs of said contact assembly is spirally cut to make a clockwise current pass, and said other flat disc is spirally cut to make a counter-clockwise current pass.
Claim 3
Dependent Claim
33 words
A vacuum circuit breaker according to claim 1, wherein said flat discs include spiral cuts which are overlapped by insertion of a ring insulator located between the outer peripheral edges of said discs.
Claim 4
Dependent Claim
240 words
A vacuum circuit breaker comprising: a highly evacuated envelope; a pair of co-acting electrodes located in the envelope to be relatively movable from a position of engagement to a position of disengagement to make a circuit interruption; a contact assembly secured to at least one of said electrodes at one end thereof, said contact assembly including a pair of flat discs one of which has a center portion secured to one end of said electrode and the other of which has a contact region at its center area; said flat discs being electrically connected at the peripheral portion so as to make at least one current loop perpendicular to the axis of said electrode and directed from the center of one of said discs through the outer peripheral portion thereof and the outer peripheral portion of said other disc to the center thereof; whereby said current loop creates magnetic fluxes surrounding an electric arc which occurs between said electrodes during said circuit interruption; and wherein said flat discs are constructed by a pair of circular discs which include a conductive ring having a notch in tHe circular direction thereof and located between said discs and a pair of ring insulators respectively positioned between said discs and the conductive ring, and an electric current path is made from one of flat discs through one of said conductive ring and the other end of said conductive ring to said other flat disc.
Claim 5
Dependent Claim
240 words
A vacuum circuit breaker comprising: a highly evacuated envelope; a pair of co-acting electrodes located in the envelope to be relatively movable from a position of engagement to a position of disengagement to make a circuit interruption; a contact assembly secured to at least one of said electrodes at one end thereof, said contact assembly including a pair of flat discs one of which has a center portion secured to one end of said electrode and the other of which has a contact region at its center area; said flat discs being electrically connected at the peripheral portion so as to make at least one current loop perpendicular to the axis of said electrode and directed from the center of one of said discs through the outer peripheral portion thereof and the outer peripheral portion of said other disc to the center thereof; whereby said current loop creates magnetic fluxes surrounding an electric arc which occurs between said electrodes during said circuit interruption; and wherein said flat discs are constructed by a pair of circular discs which include a conductive ring having a notch in tHe circular direction thereof and located between said discs and a pair of ring insulators respectively positioned between said discs and the conductive ring, and an electric current path is made from one of flat discs through one of said conductive ring and the other end of said conductive ring to said other flat disc.
References Cited (Backward Citations)
US3280286A
Cited
US3480821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |