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US3597558A
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US
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Multiple-walled arc-quenching chamber for vacuum switching devices
Assignee: INST PRUEFFELD ELEKT
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Filing: 1969-05-08
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Granted: 1971-08-03
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Expires: 1989-05-08
Abstract
Abstract The insulating portion of the housing of an arc-quenching chamber is created in the form of a double-wall cylinder. To reduce the permeability of the chamber to gas, the hollow space between the walls is filled with gas at a pressure which is higher than that in the evacuated chamber but lower than the atmospheric pressure.
Inventors
- 👤 Alfred G H Gotsch
- 👤 Heinz Hanisch
- 👤 Ernst Freund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:28
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/662; H01H33/66207; H01H33/66261; H01H2033/66276; H01H33/668
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
112 words
In a vacuum are arc-quenching chamber, wherein a first switch electrode is rigidly mounted on a first metallic, electrically conductive structure, and a second switch electrode is movably mounted on a second metallic, electrically conductive structure, for motion of the second toward the first electrode and away from it, said structures having rigid plates to close opposite ends of a highly evacuated arc chamber, the improvement which comprises: a plurality of rigid, electrically insulative, mutually surrounding wall structures, having ends hermetically sealed to one another, and to the outer edges of said plates, to provide a sealed jacket space; and a rarified medium, at higher but subatmospheric pressure, in said jacket space.
Claim 2
Dependent Claim
112 words
In a vacuum are arc-quenching chamber, wherein a first switch electrode is rigidly mounted on a first metallic, electrically conductive structure, and a second switch electrode is movably mounted on a second metallic, electrically conductive structure, for motion of the second toward the first electrode and away from it, said structures having rigid plates to close opposite ends of a highly evacuated arc chamber, the improvement which comprises: a plurality of rigid, electrically insulative, mutually surrounding wall structures, having ends hermetically sealed to one another, and to the outer edges of said plates, to provide a sealed jacket space; and a rarified medium, at higher but subatmospheric pressure, in said jacket space.
Claim 3
Dependent Claim
15 words
The combination of claim 1 wherein the electrically insulative wall structures are of ceramic material.
Claim 4
Dependent Claim
23 words
The combination of claim 1 wherein the electrically insulative wall structures comprise a pair of short cylinders, radially closed spaced from one another.
Claim 5
Dependent Claim
31 words
The combination of claim 1 wherein the outermost, electrically insulative wall structure has ribs thereon to add to the spark-over path or tracking spark-over path provided by the insulative wall structure.
Claim 6
Dependent Claim
35 words
The combination of claim 1 additionally including: metallic wall structure which, longitudinally of the arc chamber, is spaced from said plates and spaces path of the mutually surrounding electrically insulative wall structures from one another.
Claim 7
Dependent Claim
20 words
The combination of claim 5 wherein the metallic wall structure is of single-wall type and does not provide a jacket.
Claim 8
Dependent Claim
19 words
The combination according to claim 6 wherein the metallic wall structure is arranged to provide shielding around the electrodes.
Claim 9
Dependent Claim
26 words
The combination according to claim 1 wherein the rarified medium in the jacket space is selected from the group consisting of air, inert gas and SF6.
Claim 10
Dependent Claim
34 words
The combination according to claim 1 wherein said pressure of the rarified medium in the jacket space differs by several orders of magnitude from the pressures inside the arc-quenching chamber and on the outside.
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |