Patent US4256941A successfully refreshed from Google Patents.
US4256941A
Expired / Lapsed
US
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Spring operating devices for high-voltage circuit-breakers
Assignee: ABB Norden Holding AB
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Filing: 1979-03-05
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Granted: 1981-03-17
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Expires: 1999-03-05
Abstract
Abstract In a spring operating device for high-voltage circuit-breakers, opening springs include at least two cooperating torsion bars clamped at one end to each other and connected at the free end to a movable contact of the breaker such that the torsion bars have opposite directions of rotation.
Inventors
- 👤 Sven Bachler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:26
CPC Classifications
H; H01; H01H; H01H3/00; H01H3/22; H01H3/30; H01H3/3042
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
Spring operating device for high-voltage circuit-breakers, comprising: a support; an opening spring including at least two cooperating torsion bars arranged substantially parallel to each other with one end of each of said bars being permanently clamped to said support; a radially directed operating arm provided at the other end of said bars; and a rod system connected to said operating arms to transmit the spring force to the movable contact of a circuit-breaker, said operating arms and rod system being so arranged that said torsion bars have opposite directions of rotation.
Claim 2
Dependent Claim
91 words
Spring operating device for high-voltage circuit-breakers, comprising: a support; an opening spring including at least two cooperating torsion bars arranged substantially parallel to each other with one end of each of said bars being permanently clamped to said support; a radially directed operating arm provided at the other end of said bars; and a rod system connected to said operating arms to transmit the spring force to the movable contact of a circuit-breaker, said operating arms and rod system being so arranged that said torsion bars have opposite directions of rotation.
Claim 3
Dependent Claim
40 words
Operating device according to claim 1, further comprising a closing spring for closing the breaker and tensioning said opening spring, said closing spring consisting of torsion rods arranged in the same manner as said torsion rods of said opening spring.
Claim 4
Dependent Claim
40 words
Operating device according to claim 2 or 1, wherein said opening spring comprises at least four torsion rods which are connected together pairwise by links such that an increasing opening force is obtained towards the end of the opening movement.
References Cited (Backward Citations)
US3213214A
Cited
US3470750A
Cited
US3582591A
Cited
US3898409A
Cited
US3898420A
Cited
US4156803A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |