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US3825708A
Expired / Lapsed
US
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Method and means for breaking a high-power circuit
Assignee: Kafak AB
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Filing: 1972-04-06
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Granted: 1974-07-23
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Expires: 1992-04-06
Abstract
Abstract A method of breaking a high-power current passing through a switch is characterized by transferring the current to a contact member which is then opened. The switch includes two groups of stationary contact members and a movable contact member, cams being provided to vary the opening and closing positions of the groups.
Inventors
- 👤 K Bergman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:12
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/04; H01H33/12; F; F15; F15B; F15B11/00; F15B11/02; F15B11/04; F15B11/044; F15B11/08; F15B11/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
193 words
A device for breaking a high power current, comprising a switch dimensioned for permanent current carrying, a breaking contact member dimensioned solely for current breaking, a rotary axle, cam members carried by said axle and connected with said switch and said member, means actuating said axle and said cams for transferring the current flowing through said switch to said member and immediately thereafter actuating said member to open it and break the current, wherein said switch and said member consist of similar groups of contact members, each group comprising two two spaced stationary contact members and a movable contact member engaging one stationary contact member and adapted to move in and out of engagement with the other stationary contact member, and means interconnecting said groups in parallel, said cam members being adapted to hold one group in a closing position and the other group in the open position during the initial phase of current breaking, to hold both groups in the closing position during the following phase, to hold said one group in the open position in the following phase and to hold both groups in the open position during the final phase.
Claim 2
Independent Claim
193 words
A device for breaking a high power current, comprising a switch dimensioned for permanent current carrying, a breaking contact member dimensioned solely for current breaking, a rotary axle, cam members carried by said axle and connected with said switch and said member, means actuating said axle and said cams for transferring the current flowing through said switch to said member and immediately thereafter actuating said member to open it and break the current, wherein said switch and said member consist of similar groups of contact members, each group comprising two two spaced stationary contact members and a movable contact member engaging one stationary contact member and adapted to move in and out of engagement with the other stationary contact member, and means interconnecting said groups in parallel, said cam members being adapted to hold one group in a closing position and the other group in the open position during the initial phase of current breaking, to hold both groups in the closing position during the following phase, to hold said one group in the open position in the following phase and to hold both groups in the open position during the final phase.
Claim 3
Dependent Claim
17 words
A device in accordance with claim 1, comprising a resistance connected in series with said other group.
Claim 4
Dependent Claim
17 words
A device in accordance with claim 1, comprising a capacitor connected in series with said other group.
Claim 5
Dependent Claim
20 words
A device in accordance with claim 1, wherein said other group comprises a plurality of contact members connected in series.
Claim 6
Dependent Claim
20 words
A device in accordance with claim 1, wherein said one group comprises a plurality of contact members connected in series.
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |