Patent US4493006A successfully refreshed from Google Patents.
US4493006A
Expired / Lapsed
US
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Gas discharge overvoltage arrester with parallel-connected spark gap
Assignee: Siemens AG
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Filing: 1984-02-17
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Granted: 1985-01-08
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Expires: 2004-02-17
Abstract
Abstract Overvoltage arrester having a gas-filled housing, including two overvoltage arrester electrodes disposed across from each other in the housing, a tubular insulator body spacing the overvoltage arrester electrodes apart from each other, a ring-shaped flange integral with one of the overvoltage arrester electrodes forming a first spark gap electrode, a ring-shaped metal cap forming a second spark gap electrode being superimposed on the first spark gap electrode and pressed in on the tubular insulator body, the first and second spark gap electrodes forming a spark gap having a given clearance therebetween, and a contact spring connecting the second spark gap electrode to the other of the overvoltage arrester electrodes.
Inventors
- 👤 Gerhard Lange
- 👤 Jurgen Boy
- 👤 Ernst-Ludwig Hoene
- 👤 Oskar Sippekamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:25
CPC Classifications
H; H01; H01T; H01T1/00; H01T1/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
152 words
Overvoltage arrester having a gas-filled housing, comprising two overvoltage arrester electrodes disposed across from each other in the housing, a tubular insulator body spacing said overvoltage arrester electrodes apart from each other so as to define an isolating gap therebetween, a ring-shaped flange integral with one of said overvoltage arrester electrodes and forming a first spark gap electrode, a ring-shaped metal cap having an annular, radially inward projecting flange, said inward projecting flange surrounding and spaced from said first spark gap electrode and pressed onto said tubular insulator body, and a contact spring connecting said metal cap to the other of said overvoltage arrester electrodes, said metal cap inward projecting flange forming a second spark gap electrode defining with said first spark gap electrode a spark gap having a defined clearance therebetween smaller than the clearance of said isolating gap, said cap being inwardly arched in the vicinity of said spark gap.
Claim 2
Dependent Claim
152 words
Overvoltage arrester having a gas-filled housing, comprising two overvoltage arrester electrodes disposed across from each other in the housing, a tubular insulator body spacing said overvoltage arrester electrodes apart from each other so as to define an isolating gap therebetween, a ring-shaped flange integral with one of said overvoltage arrester electrodes and forming a first spark gap electrode, a ring-shaped metal cap having an annular, radially inward projecting flange, said inward projecting flange surrounding and spaced from said first spark gap electrode and pressed onto said tubular insulator body, and a contact spring connecting said metal cap to the other of said overvoltage arrester electrodes, said metal cap inward projecting flange forming a second spark gap electrode defining with said first spark gap electrode a spark gap having a defined clearance therebetween smaller than the clearance of said isolating gap, said cap being inwardly arched in the vicinity of said spark gap.
Claim 3
Dependent Claim
13 words
Overvoltage arrester according to claim 1, wherein said cap is formed of brass.
Claim 4
Dependent Claim
17 words
Overvoltage arrester according to claim 1, wherein said given clearance of said spark gap is 0.09 mm.
Claim 5
Dependent Claim
33 words
Overvoltage arrester according to claim 1, including an insulating foil maintaining said clearance of said spark gap, said foil being disposed beyond said spark gap and centrally disposed between said spark gap electrodes.
Claim 6
Dependent Claim
20 words
Overvoltage arrester according to claim 1, wherein said cap has four surfaces formed thereon uniformly distributed about the periphery thereof.
Claim 7
Dependent Claim
36 words
Overvoltage arrester according to claim 1, wherein the cap forming said second spark gap electrode and said first spark gap electrode have oppositely disposed surfaces formed thereon, and at least one of said surfaces is roughened.
Claim 8
Dependent Claim
41 words
Overvoltage arrester according to claim 1, wherein said cap has an inner surface and said first spark gap electrode has a surface disposed opposite said inner surface, and including a thin graphite layer disposed on at least one of said surfaces.
Claim 9
Dependent Claim
29 words
Overvoltage arrester according to claim 1, including a tubular holder, said contact springs having outer surfaces in the form of means for centering the overvoltage arrester in said holder.
Claim 10
Dependent Claim
53 words
Overvoltage arrester according to claim 1, wherein said tubular insulator body has an inner wall, and including at least one coating of electrically conductive material serving as a firing bar disposed on said inner wall and extended from said first spark gap electrode toward the oppositely disposed other of said overvoltage arrester electrodes.
References Cited (Backward Citations)
US4405967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |