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Patent US3659065A successfully refreshed from Google Patents.
US3659065A
Expired / Lapsed
US
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Fluid-blast circuit interrupter with delayed moving contact travel
Assignee: Westinghouse Electric Corp
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Filing: 1970-03-06
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Granted: 1972-04-25
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Expires: 1990-03-06
Abstract
Abstract A fluid-blast circuit interrupter is provided having a pair of separable contacts, the moving contact of which has two delayed periods during its opening travel, the first of which is during the time of increasing fluid pressure resulting from pistongenerating action, with a relatively short arc length, and the second delayed period of the movable contact is during the time of fluid flow with an arc length of greater length adequate for arc interruption. Subsequently, the moving contact is further withdrawn to the fully open-circuit position to thereby be capable of withstanding the returning recovery-voltage transient.
Inventors
- 👤 Robert Michael Roidt
- 👤 Bruce W Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:20
CPC Classifications
H; H01; H01H; H01H3/00; H01H3/32; H01H3/42; H01H3/52; H01H33/00; H01H33/70; H01H33/88; H01H33/90; H01H33/904
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
134 words
A fluid-blast piston-type circuit interrupter including, in combination: a. separable contact means including a pair of cooperable contacts, at least one of which is movable and the other relatively stationary; b. operating means for the circuit interrupter effective to cause the movable contact to assume two consecutive open delaying arcing positions one of short arc length and the other of longer arc length; c. said operating means causing continuous fluid-increasing pressure by said piston means during both of said consecutive open delaying arcing positions of the movable contact; d. the first delaying position occurring when the established Arc is of short length incapable of being interrupted by the then-available fluid pressure; and, e. the second delaying position occurring when the arc is of a length capable of being interrupted by the then-available fluid pressure.
Claim 2
Dependent Claim
134 words
A fluid-blast piston-type circuit interrupter including, in combination: a. separable contact means including a pair of cooperable contacts, at least one of which is movable and the other relatively stationary; b. operating means for the circuit interrupter effective to cause the movable contact to assume two consecutive open delaying arcing positions one of short arc length and the other of longer arc length; c. said operating means causing continuous fluid-increasing pressure by said piston means during both of said consecutive open delaying arcing positions of the movable contact; d. the first delaying position occurring when the established Arc is of short length incapable of being interrupted by the then-available fluid pressure; and, e. the second delaying position occurring when the arc is of a length capable of being interrupted by the then-available fluid pressure.
Claim 3
Dependent Claim
23 words
The fluid-blast circuit interrupter of claim 1, wherein the motion of the movable contact is achieved by the use of a suitably-configured cam.
Claim 4
Dependent Claim
40 words
The fluid-blast circuit interrupter of claim 1, wherein the piston means includes a movable operating piston cylinder linked to an operating shaft, and a cam fixedly secured to said operating shaft and causing the independent motion of the movable contact.
Claim 5
Dependent Claim
20 words
The fluid-blast circuit interrupter of claim 2, wherein the cam is positioned between two floating links operating the piston means.
Claim 6
Dependent Claim
132 words
A piston-type of fluid-blast circuit interrupter including, in combination: a. a relatively stationary venting contact cooperable with a movable venting contact to establish an arc; b. a movable piston structure for forcing generated fluid pressure toward the established arc including a movable piston; c. operating means for causing continuous working travel of the piston during the opening operation; d. said operating means including means for causing two delayed positions of the movable venting contact; e. said first delayed position assuring a short arc length during buildup of piston-generated fluid pressure; f. said second delayed position assuring adequate arc length at a time when adequate fluid pressure force has been attained; and, g. fluid-directing means to cause radially inwardly directed fluid pressure to exhaust in substantially opposite directions through both cooperable venting contacts.
Claim 7
Dependent Claim
132 words
A piston-type of fluid-blast circuit interrupter including, in combination: a. a relatively stationary venting contact cooperable with a movable venting contact to establish an arc; b. a movable piston structure for forcing generated fluid pressure toward the established arc including a movable piston; c. operating means for causing continuous working travel of the piston during the opening operation; d. said operating means including means for causing two delayed positions of the movable venting contact; e. said first delayed position assuring a short arc length during buildup of piston-generated fluid pressure; f. said second delayed position assuring adequate arc length at a time when adequate fluid pressure force has been attained; and, g. fluid-directing means to cause radially inwardly directed fluid pressure to exhaust in substantially opposite directions through both cooperable venting contacts.
Claim 8
Dependent Claim
34 words
The combination of claim 5, wherein the movable contact is spring-biased to the closed position, and the operating means includes a suitably configured cam to independently control the motion of the movable venting contact.
References Cited (Backward Citations)
US3226513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |