Patent US4572797A successfully refreshed from Google Patents.
US3674959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit interrupter closing resistors
Assignee: Allis Chalmers Corp
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Filing: 1970-12-10
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Granted: 1972-07-04
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Expires: 1990-12-10
Abstract
Abstract A fluid blast type electric circuit interrupter comprises a tank at ground potential containing compressed fluid (air). First and second hollow insulating columns are mounted on said tank in spaced apart relationship. The first insulating column supports six transversely arranged insulating housings and a pair of separable circuit interrupter contacts are located in each housing. The second insulating column also supports six transversely arranged insulating housings. A pair of separable isolator contacts are located in each of the two upper and each of the two lower housings on the second insulating column. A pair of separable resistor control contacts are located in each of the two middle housings on the second insulating column. All pairs of contacts are connected in series. Each pair of resistor control contacts is shunted by a closing resistor. Fluid flow control valves are located in the tank and in the two insulating columns to effect opening and closing operations of the pair of contacts of the circuit interrupter. The control valves effect an opening operation by first opening the circuit interrupter contacts, subsequently opening the isolator contacts and the resistor control contacts simultaneously, and subsequently reclosing the circuit interrupter contacts. The control valves effect a closing operation by first closing the isolator contacts and subsequently closing the resistor control contacts.
Inventors
- 👤 Thomas F Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:00
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/04; H01H33/14; H01H33/70; H01H33/80; H01H33/82
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
In an electric circuit interrupter device, at least one first pair of separable circuit interrupter contacts, at least one second pair of separable isolator contacts in series with said first pair of contacts, at least one third pair of separable resistor control contacts in series with said second pair of contacts, closing resistance means in parallel with said third pair of contacts, and operating means to effect opening and closing operations of said interrupter device, said operating means effecting an opening operation by first opening said first pair of contacts, subsequently opening said second and third pair of contacts simultaneously with each other, and subsequently reclosing said first pair of contacts, said operating means effecting a closing operation by first closing said second pair of contacts and subsequently closing said third pair of contacts.
Claim 2
Dependent Claim
134 words
In an electric circuit interrupter device, at least one first pair of separable circuit interrupter contacts, at least one second pair of separable isolator contacts in series with said first pair of contacts, at least one third pair of separable resistor control contacts in series with said second pair of contacts, closing resistance means in parallel with said third pair of contacts, and operating means to effect opening and closing operations of said interrupter device, said operating means effecting an opening operation by first opening said first pair of contacts, subsequently opening said second and third pair of contacts simultaneously with each other, and subsequently reclosing said first pair of contacts, said operating means effecting a closing operation by first closing said second pair of contacts and subsequently closing said third pair of contacts.
Claim 3
Dependent Claim
217 words
In a fluid blast type electric circuit interrupter, a tank at ground potential containing compressed fluid, first and second hollow insulating columns mounted on said tank in spaced apart relationship, at least one first pair of separable circuit interrupter contacts mounted on said first column, at least one second pair of separable isolator contacts mounted on said second column and in series with said first pair of contacts, at least one third pair of separable resistor control contacts mounted on said second column and in series with said second pair of contacts, each of said pair of contacts being located in a hollow housing mounted on a respective insulating column, closing resistance means mounted on said second column and in parallel with said third pair of contacts, and opeRating means to effect opening and closing operations of said circuit interrupter, said operating means comprising fluid flow control valves located in said tank and in the hollow contact housings, said operating means effecting an opening operation by first opening said first pair of contacts, subsequently opening said second and third pair of contacts simultaneously with each other, and subsequently reclosing said first pair of contacts, said operating means effecting a closing operation by first closing said second pair of contacts and subsequently closing said third pair of contacts.
Claim 4
Dependent Claim
217 words
In a fluid blast type electric circuit interrupter, a tank at ground potential containing compressed fluid, first and second hollow insulating columns mounted on said tank in spaced apart relationship, at least one first pair of separable circuit interrupter contacts mounted on said first column, at least one second pair of separable isolator contacts mounted on said second column and in series with said first pair of contacts, at least one third pair of separable resistor control contacts mounted on said second column and in series with said second pair of contacts, each of said pair of contacts being located in a hollow housing mounted on a respective insulating column, closing resistance means mounted on said second column and in parallel with said third pair of contacts, and opeRating means to effect opening and closing operations of said circuit interrupter, said operating means comprising fluid flow control valves located in said tank and in the hollow contact housings, said operating means effecting an opening operation by first opening said first pair of contacts, subsequently opening said second and third pair of contacts simultaneously with each other, and subsequently reclosing said first pair of contacts, said operating means effecting a closing operation by first closing said second pair of contacts and subsequently closing said third pair of contacts.
Claim 5
Dependent Claim
84 words
A circuit interrupter according to claim 2 which comprises a plurality of first pairs of contacts which are series connected with each other and are mounted on said first column, a plurality of second pairs of contacts which are series connected with each other and are mounted on said second column, a plurality of third pairs of contacts which are series connected with each other and are mounted on said second column, and a plurality of closing resistance means mounted on said second column.
Claim 6
Dependent Claim
29 words
A circuit interrupter according to claim 3 wherein each of said pairs of contacts is located in a separate hollow insulating housing which extends transversely from its supporting column.
Claim 7
Dependent Claim
30 words
A circuit interrupter according to claim 4 wherein there are six first pairs of contacts, four second pairs of contacts, two third pairs of contacts and two closing resistance means.
References Cited (Backward Citations)
US3446928A
Cited
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 |