Patent US4709831A successfully refreshed from Google Patents.
Patent US3899650A successfully refreshed from Google Patents.
US3899650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grounded tank circuit breaker
Assignee: Hitachi Ltd
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Filing: 1973-08-17
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Granted: 1975-08-12
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Expires: 1993-08-17
Abstract
Abstract A circuit breaker with multiple breaking points which has at least two breaking sections with movable portions respectively connected to a couple of link devices for driving the movable portions, the two breaking sections being enclosed within a tank which is grounded and filled with an insulating medium for quenching the arc; characterized by the provision of a shield device covering the link devices thereby to reduce the effect of disturbance of electric field due to the formation and positioning of levers of the link devices, thus preventing dielectric breakdown of the insulating medium.
Inventors
- 👤 Tuneo Kishi
- 👤 Seizo Nakano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:57
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/42; H01H33/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
A circuit breaker of a grounded tank type comprising: a. a grounded tank containing an arc-extinguishing gas; b. first and second breaking sections disposed in the grounded tank, each of said breaking sections including a stationary contact, a movable contact opposed to the stationary contact, a movable cylinder integral with the movable contact, and a fixed piston cooperating with the moveable cylinder to produce a pressurized arc-extinguishing gas; c. a link device interposed between said first and second breaking sections for transmitting driving force from a driving source to the respective movable cylinders of said first and second breaking sections; d. supporting means which supports said first and second breaking sections in the grounded tank through the respective fixed piston; and e. conductive means electrically connecting said first and second breaking sections in series and substantially enclosing said link device for shielding said link device from the grounded tank.
Claim 2
Dependent Claim
149 words
A circuit breaker of a grounded tank type comprising: a. a grounded tank containing an arc-extinguishing gas; b. first and second breaking sections disposed in the grounded tank, each of said breaking sections including a stationary contact, a movable contact opposed to the stationary contact, a movable cylinder integral with the movable contact, and a fixed piston cooperating with the moveable cylinder to produce a pressurized arc-extinguishing gas; c. a link device interposed between said first and second breaking sections for transmitting driving force from a driving source to the respective movable cylinders of said first and second breaking sections; d. supporting means which supports said first and second breaking sections in the grounded tank through the respective fixed piston; and e. conductive means electrically connecting said first and second breaking sections in series and substantially enclosing said link device for shielding said link device from the grounded tank.
Claim 3
Dependent Claim
24 words
A circuit breaker of a grounded tank type according to claim 1, in which a cross section of said conductive means is ''''U'''' shaped.
Claim 4
Dependent Claim
21 words
A circuit breaker of a grounded tank type according to claim 1, in which said conductive means is made of copper.
Claim 5
Dependent Claim
21 words
A circuit breaker of a grounded tank type according to claim 1, in which said conductive means is made of aluminum.
Claim 6
Dependent Claim
68 words
A circuit breaker of a grounded tank type according to claim 1, wherein said movable cylinder is mounted to be movable relative to said fixed piston such that during an opening movement of said first and second breaking sections by said link device said arc-extinguishing gas is compressed in said movable cylinder to a pressure sufficiently high to be blown between said stationary contact and said movable contact.
Claim 7
Dependent Claim
27 words
A circuit breaker of a grounded tank type according to claim 1, wherein said supporting means also acts to electrically connect said first and second breaking sections.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |