Patent US4513208A successfully refreshed from Google Patents.
US4513208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical switchgear
Assignee: Toshiba Corp
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Filing: 1984-02-23
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Granted: 1985-04-23
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Expires: 2004-02-23
Abstract
Abstract An electrical switchgear having a position detector that detects the state of actuation of switch contacts and a position detector which judges the locking engagement condition of the switch contacts, wherein these position detectors are connected with an optical control unit by an optical cable.
Inventors
- 👤 Isao Kamata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:26
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/16; H01H9/168; H01H33/00; H01H33/02; H01H33/28; H01H33/30; H01H2033/306; H01H31/00; H01H31/26; H01H31/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
An electrical switchgear which comprises: fixed and movable contacts arranged in a tank filled with insulating gas; a switch mechanism driving said movable contact, and including a mainshaft; an operating unit connected to said main shaft of said switch mechanism; a first position detector means for optically detecting the operating state of said movable contact; an optical control unit being connected to said first detector by means of an optical cable, said optical control unit outputting a signal to said operating unit for controlling said switch mechanism.
Claim 2
Dependent Claim
87 words
An electrical switchgear which comprises: fixed and movable contacts arranged in a tank filled with insulating gas; a switch mechanism driving said movable contact, and including a mainshaft; an operating unit connected to said main shaft of said switch mechanism; a first position detector means for optically detecting the operating state of said movable contact; an optical control unit being connected to said first detector by means of an optical cable, said optical control unit outputting a signal to said operating unit for controlling said switch mechanism.
Claim 3
Dependent Claim
44 words
An electrical switchgear according to claim 1 said first detector means comprises a colored disk; a light emitting means for outputting light to said disk; and wherein said first detector means detects the amount of said outputted light which is reflected from said disk.
Claim 4
Dependent Claim
108 words
An electrical switchgear which comprises: fixed and movable contacts arranged in a tank filled with insulating gas; a switch mechanism driving said movable contact and including a main shaft; an operating unit connected to said main shaft of said switch mechanism; a first position detector means for optically detecting the operating state of said movable contact; a second position detector means for optically detecting the possibility of the manual operation of said movable contact; an optical control unit being connected with said first and second detector by means of an optical cable, said optical control unit outputting a signal to said operating unit for controlling said switch mechanism.
Claim 5
Dependent Claim
108 words
An electrical switchgear which comprises: fixed and movable contacts arranged in a tank filled with insulating gas; a switch mechanism driving said movable contact and including a main shaft; an operating unit connected to said main shaft of said switch mechanism; a first position detector means for optically detecting the operating state of said movable contact; a second position detector means for optically detecting the possibility of the manual operation of said movable contact; an optical control unit being connected with said first and second detector by means of an optical cable, said optical control unit outputting a signal to said operating unit for controlling said switch mechanism.
Claim 6
Dependent Claim
23 words
An electrical switchgear according to claim 3, said second detector means includes means for detecting the presence of light from a reflection means.
Claim 7
Dependent Claim
123 words
An electrical switchgear which comprises: fixed and movable contacts arranged in a tank filled with insulating gas; a switch mechanism driving said movable contact and including a main shaft; an operating unit connected to said main shaft of said switch mechanism; a first position detector means for optically detecting the operating state of said movable contact; a second detector means for detecting optically the pressure of said insulating gas in said tank; a third detector means for detecting optically the pressure of an accumulator in said operating unit; an optical control unit being connected with said first, second and third detectors by means of an optical cable, said optical control unit outputting a signal to said operating unit for controlling said switch mechanism.
Claim 8
Dependent Claim
123 words
An electrical switchgear which comprises: fixed and movable contacts arranged in a tank filled with insulating gas; a switch mechanism driving said movable contact and including a main shaft; an operating unit connected to said main shaft of said switch mechanism; a first position detector means for optically detecting the operating state of said movable contact; a second detector means for detecting optically the pressure of said insulating gas in said tank; a third detector means for detecting optically the pressure of an accumulator in said operating unit; an optical control unit being connected with said first, second and third detectors by means of an optical cable, said optical control unit outputting a signal to said operating unit for controlling said switch mechanism.
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) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |