US4045726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool for manually tripping a fault indicator for high voltage electric power circuits and resetting same
Assignee: Individual
•
Filing: 1976-07-06
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Granted: 1977-08-30
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Expires: 1996-07-06
Abstract
Abstract This invention relates, generally, to fault indicators and it has particular relation to tools for testing fault indicators of the kind and character disclosed in my U.S. Pat. No. 3,906,477, issued Sept. 16, 1975.
Inventors
- 👤 Edmund O. Schweitzer, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:24
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
153 words
A test tool for a fault indicator having a magnetically operable reed switch arranged to be positioned generally parallel to the alternating magnetic field generated around a conductor by flow of alternating fault current therein to operate an indicator to fault indicating position and a circuit responsive to the voltage at which said conductor is energized to reset said indicator to non-fault indicating position including a test point, said test tool comprising a unitary structure including a winding having a longitudinal axis arranged to be placed generally parallel and juxtaposed to the longitudinal axis of said reed switch, a test point contact to engage said test point, means for energizing said winding with alternating current to generate a magnetic field for closing said reed switch to operate said indicator to said fault indicating position, and means for applying a voltage to said test point contact to energize said circuit to reset said indicator.
Claim 2
Dependent Claim
153 words
A test tool for a fault indicator having a magnetically operable reed switch arranged to be positioned generally parallel to the alternating magnetic field generated around a conductor by flow of alternating fault current therein to operate an indicator to fault indicating position and a circuit responsive to the voltage at which said conductor is energized to reset said indicator to non-fault indicating position including a test point, said test tool comprising a unitary structure including a winding having a longitudinal axis arranged to be placed generally parallel and juxtaposed to the longitudinal axis of said reed switch, a test point contact to engage said test point, means for energizing said winding with alternating current to generate a magnetic field for closing said reed switch to operate said indicator to said fault indicating position, and means for applying a voltage to said test point contact to energize said circuit to reset said indicator.
Claim 3
Dependent Claim
44 words
A test tool according to claim 1 wherein said magnetic field of said test tool is generated by current flow from a capacitor through said winding, and said voltage of said test tool is generated by an oscillator also arranged to charge said capacitor.
Claim 4
Dependent Claim
34 words
A test tool according to claim 2 wherein said capacitor is arranged to discharge periodically at a rate slower than the rate at which said indicator is reset by said voltage from said oscillator.
Claim 5
Dependent Claim
32 words
A test tool according to claim 1 wherein said test tool includes a sleeve having a fitting from which said test point contact extends and which is congruent to said fault indicator.
Claim 6
Dependent Claim
19 words
A test tool according to claim 4 wherein said winding is disposed in a housing integral with said sleeve.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |