US3679938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical disconnector
Assignee: Westinghouse Electric Corp
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Filing: 1970-09-29
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Granted: 1972-07-25
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Expires: 1990-09-29
Abstract
Abstract A disconnector for lightning arresters is provided with a simplified configuration wherein a cup-shaped breakable housing has within it a substantially concentric insulating support member that is recessed to accommodate an explosive containing metal case resting on an end portion of a ground terminal. The insulating support defines a fixed spark gap spacing between the metal case and an electrode making direct contact with a lightning arrester. A flexible grading resistor is provided in parallel with the spark gap and comprises a flexible insulating core on which is wound a plurality of turns of resistive wire, the resistor encircling the insulating support in the space between it and the inner housing wall.
Inventors
- 👤 Charles H Carothers
- 👤 Robert M Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:25
CPC Classifications
H; H01; H01T; H01T1/00; H01T1/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
An explosive circuit-opening device comprising: a cup-shaped breakable housing having a rim for securing to an excess-voltage protective device and a center bore through which a ground terminal member extends; said ground terminal member having an end portion within said housing, a unitary support member of insulating material having a recess accommodating an explosivecontaining metal case, said insulating support member being disposed on said end portion of said ground terminal with said metal case being in direct electrical contact with said end portion; an electrode member within a portion of said insulating support member and spaced a predetermined distance from said metal case and defining the operative spark gap of said device therebetween.
Claim 2
Dependent Claim
113 words
An explosive circuit-opening device comprising: a cup-shaped breakable housing having a rim for securing to an excess-voltage protective device and a center bore through which a ground terminal member extends; said ground terminal member having an end portion within said housing, a unitary support member of insulating material having a recess accommodating an explosivecontaining metal case, said insulating support member being disposed on said end portion of said ground terminal with said metal case being in direct electrical contact with said end portion; an electrode member within a portion of said insulating support member and spaced a predetermined distance from said metal case and defining the operative spark gap of said device therebetween.
Claim 3
Dependent Claim
53 words
The subject matter of claim 1 wherein: a resistor is connected to provide an electrical path in parallel with said spark gap, said resistor comprising a flexible insulating core on which are wound a plurality of turns of resistive wire, said resistor encircling said support member for a substantial portion of its circumference.
Claim 4
Dependent Claim
40 words
The subject matter of claim 2, wherein: said housing has a substantially cylindrical inner surface; said insulating support member has a substantially cylindrical outer surface that is substantially concentric with said inner surface of said housing with a space therebetween.
Claim 5
Dependent Claim
42 words
The subject matter of claim 3 wherein a first spring contact makes electrical contact between one end of said resistor and said metal case and a second spring contact makes electrical contact between said electrode and the other end of said resistor.
Claim 6
Dependent Claim
33 words
The subject matter of claim 1 wherein: said end portion of said ground terminal is a generally flat portion resting within a recess in the bottom surface of the inside of said housing.
Claim 7
Dependent Claim
29 words
The subject matter of claim 5 wherein: said explosive-containing metal case has an elongated configuration with its long dimension substantially parallel with said end portion of said ground terminal.
References Cited (Backward Citations)
US2824928A
Cited
US3100246A
Cited
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 |