Patent US3679851A successfully refreshed from Google Patents.
US3679851A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Autoextinguishing interrupters
Assignee: Magrini Fabbriche Riunite Magrini Scarpa e Magnano MSM SpA
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Filing: 1970-06-22
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Granted: 1972-07-25
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Expires: 1990-06-22
Abstract
Abstract The invention relates to a self-extinguishing interruptor in which one of the contacts is mounted in the upstream portion of an insulating tube. It is characterized in that the total section of the passage of the conduit or conduits which feed the compressed gas to the tube is limited to a value equal to or less than the section of the passage of the neck of the tube.
Inventors
- 👤 Andre Latour
- 👤 Giacomo Fumagalli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:56
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/70; H01H33/7015; H01H33/7023
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A circuit breaker for high-voltage alternating current, comprising an insulating nozzle defining an axially extending arc-extinguishing nozzle chamber; a pair of contacts disposed in said nozzle chamber, one of said contacts being movable relative to the other of said contacts axially to interrupt an electric circuit between said contacts; inlet means coupled with the movable contact for forcing an arc-extinguishing gas through said nozzle chamber upon opening of said circuit, said nozzle chamber being formed at an intermediate location along the length with a constriction ahead of said arc-extinguishing gas through said nozzle chamber and between both said contacts in an open-circuit position thereof; and means defining an axially extending duct connecting said inlet means with said nozzle chamber and having a flow cross-section traversed by said arc extinguishing gas which is between 1 and 1/35 time the cross-section of said constriction.
Claim 2
Dependent Claim
142 words
A circuit breaker for high-voltage alternating current, comprising an insulating nozzle defining an axially extending arc-extinguishing nozzle chamber; a pair of contacts disposed in said nozzle chamber, one of said contacts being movable relative to the other of said contacts axially to interrupt an electric circuit between said contacts; inlet means coupled with the movable contact for forcing an arc-extinguishing gas through said nozzle chamber upon opening of said circuit, said nozzle chamber being formed at an intermediate location along the length with a constriction ahead of said arc-extinguishing gas through said nozzle chamber and between both said contacts in an open-circuit position thereof; and means defining an axially extending duct connecting said inlet means with said nozzle chamber and having a flow cross-section traversed by said arc extinguishing gas which is between 1 and 1/35 time the cross-section of said constriction.
Claim 3
Dependent Claim
60 words
The circuit breaker defined in claim 1, further comprising an arcing electrode coupled with said movable contact and extending therebeyond in the direction of the other contact, said constriction being located ahead of said electrode, said movable contact coaxially surrounding said electrode and the last-mentioned means including a filler body in the gap between said electrode and said movable contact.
Claim 4
Dependent Claim
47 words
The circuit breaker defined in claim 2 wherein said inlet means include a gas displacement cylinder operable upon movement of said movable contact and provided with at least one opening for introducing said arc-extinguishing gas axially through said duct and along said movable contact, and said body.
Claim 5
Dependent Claim
31 words
The circuit breaker defined in claim 3 wherein the means defining said duct is formed with at least one passage extending from said cylinder and opening into said duct obliquely thereto.
Claim 6
Dependent Claim
35 words
The circuit breaker defined in claim 3 wherein said electrOde is formed with at least one passage extending away from said chamber and communicating with the exterior for venting back-blast ionized gas from said chamber.
Claim 7
Dependent Claim
23 words
The circuit breaker defined in claim 3 wherein said body is provided with a plurality of generally radial vanes extending between said fingers.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |