Patent US2041600A successfully refreshed from Google Patents.
US3674958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum circuit interrupter
Assignee: Allis Chalmers Corp
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Filing: 1970-11-23
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Granted: 1972-07-04
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Expires: 1990-11-23
Abstract
Abstract An improved vacuum type circuit interrupter rated at 50 mva and for use at a voltage level of 4.8 KV and above comprises a constant diameter hollow cylindrical copper envelope into which a stationary and movable OFHC copper contact rods extend. Each contact rod is provided at its tip with a copper-bismuth alloy contact. A pump-out port is provided through the stationary contact rod. In one embodiment, one end of the envelope is provided with a substantially flat ceramic end plate which has a central opening for accommodating the stationary contact rod. A thin Kovar sealing ring is disposed between the envelope and the outer periphery of the ceramic end plate and a thin Kovar sleeve is disposed between the end plate and the stationary contacr rod. The other end of the envelope is provided with a hollow cylindrically shaped ceramic end tube. A thin Kovar ring is disposed between the envelope and the outer periphery of the ceramic end tube. A copper mounting plate having a central opening is secured to the outer end of the ceramic end tube and a cylindrical bellows surrounds the movable contact rod and is secured between the mounting plate and the movable contact rod. Disk-like shields made of copper or nickel are disposed against shoulders on the two contact rods to confine arc products. In a second embodiment of the invention, a ceramic tube is used instead of the flat ceramic end plate.
Inventors
- 👤 Edward A Attia
- 👤 Relf Dethlefsea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:40
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/662; H01H33/66261; H01H33/66207; H01H2033/66223; H01H2033/66269; H01H2033/66292
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
281 words
In a vacuum type circuit interrupter, a hollow cylindrical metallic envelope having first and second end openings; stationary and movable contact rods extending into said envelope through said first and second end openings, respectively; contact making means at the ends of said contact rods; a first disk shaped ceramic insulation member of smaller diameter than said envelope, said first insulation member being disposed in said first end opening of said envelope; a second ceramic insulation member of tubular configuration located at said second end opening of said envelope; a first metallic sealing ring joined between said envelope and said first insulation member; a second metallic sealing ring joined between said first insulation member and said stationary contact; a third metallic sealing ring joined between said envelope and second insulation member; a metallic end member spaced from the second end opening of said envelope; a fourth metallic sealing ring joined between said end member and said second insulation member; a bellows joined between said endmember and said movable contact rod; a first disk shaped shield member of greater diameter than said first disk shaped insulation member, said first shield being carried on said stationary rod in spaced relationship to the contact means thereof and to the first disk shaped insulation member; and, a second saucer shaped shield secured to said movable contact rod in spaced relationship to said second ceramic insulation member and to the contact means of said movable contact rod with the cavity side thereof facing said first shield member in position to intercept arc particles to substantially reduce the deposit of such particles at the sealed joints and on said third seal ring and the second ceramic insulation member.
Claim 2
Dependent Claim
281 words
In a vacuum type circuit interrupter, a hollow cylindrical metallic envelope having first and second end openings; stationary and movable contact rods extending into said envelope through said first and second end openings, respectively; contact making means at the ends of said contact rods; a first disk shaped ceramic insulation member of smaller diameter than said envelope, said first insulation member being disposed in said first end opening of said envelope; a second ceramic insulation member of tubular configuration located at said second end opening of said envelope; a first metallic sealing ring joined between said envelope and said first insulation member; a second metallic sealing ring joined between said first insulation member and said stationary contact; a third metallic sealing ring joined between said envelope and second insulation member; a metallic end member spaced from the second end opening of said envelope; a fourth metallic sealing ring joined between said end member and said second insulation member; a bellows joined between said endmember and said movable contact rod; a first disk shaped shield member of greater diameter than said first disk shaped insulation member, said first shield being carried on said stationary rod in spaced relationship to the contact means thereof and to the first disk shaped insulation member; and, a second saucer shaped shield secured to said movable contact rod in spaced relationship to said second ceramic insulation member and to the contact means of said movable contact rod with the cavity side thereof facing said first shield member in position to intercept arc particles to substantially reduce the deposit of such particles at the sealed joints and on said third seal ring and the second ceramic insulation member.
Claim 3
Dependent Claim
39 words
An interrupter according to claim 1 wherein said envelope is provided with internal annular shoulders at each opening thereof; and, said first and third metallic sealing rings are disposed in sealed engagement with respective ones of said annular shoulders.
Claim 4
Dependent Claim
39 words
An interrupter according to claim 2 wherein the end of said second tubular shaped ceramic insulation member nearest said envelope is provided with a conical outer surface against which said third metallic sealing ring abuts in sealing relationship therewith.
Claim 5
Dependent Claim
93 words
An interrupter according to claim 1 wherein said first ceramic insulator is of substantially the same external diameter as the diameter of said envelope; and, there is also provided a third shield member of disk shaped configuration which is provided with an axial opening so as to permit the extension of said stationary contact rod into said envelope without physical contact therebetween, said third shield being secured to said envelope and disposed between said first shield member and the adjacent ceramic insulation member to form a labyrinth for the interception of arc particles.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |