Patent US3784774A successfully refreshed from Google Patents.
US3784774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum circuit breaker current transfer and actuation
Assignee: ABB Inc USA
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Filing: 1972-08-21
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Granted: 1974-01-08
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Expires: 1992-08-21
Abstract
Abstract A vacuum circuit breaker having a movable contact carrying rod extending outside the circuit breaker through a vacuum tight seal. The rod is positioned in a pair of spaced bearings with a bushing floatingly mounted on the rod between the bearings. The contact rod is driven by the bushing through a spring connected between the bushing and a spring bearing element on the rod in order to provide for overtravel of the drive mechanism connected to the bushing after the movable contact engages a complementary contact. Additional elements may be connected to said contact rod.
Inventors
- 👤 G Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:13
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/666; H01H33/662; H01H33/66238; H01H2033/66246; H01H2033/6667
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
In a vacuum circuit breaker, an evacuated housing; a contact rod carrying a movable contact in said housing; and a complementary contact in said housing; said contact rod having an extension outside said housing and being longitudinally reciprocal toward and away from said complementary contact; a vacuum tight seal at said contact rod at its entry into said housing; a pair of spaced bearings positioning and guiding said contact rod for reciprocal movement; a bushing floatingly mounted on said contact rods between said bearings; a spring bearing surface on said contact rod; a compression spring on said contact rod between said spring bearing surface and said floating bushing; means for operating said bushing toward said housing; the said movement of said bushing toward said housing driving said contact rod through said spring into engagement with said complementary contact; said spring being compressible as said contact rod engages said complementary contact; further travel of said bushing toward said housing further compressing said spring and establishing firm electrical contact between the movable contact on the contact rod and the complementary contact.
Claim 2
Dependent Claim
179 words
In a vacuum circuit breaker, an evacuated housing; a contact rod carrying a movable contact in said housing; and a complementary contact in said housing; said contact rod having an extension outside said housing and being longitudinally reciprocal toward and away from said complementary contact; a vacuum tight seal at said contact rod at its entry into said housing; a pair of spaced bearings positioning and guiding said contact rod for reciprocal movement; a bushing floatingly mounted on said contact rods between said bearings; a spring bearing surface on said contact rod; a compression spring on said contact rod between said spring bearing surface and said floating bushing; means for operating said bushing toward said housing; the said movement of said bushing toward said housing driving said contact rod through said spring into engagement with said complementary contact; said spring being compressible as said contact rod engages said complementary contact; further travel of said bushing toward said housing further compressing said spring and establishing firm electrical contact between the movable contact on the contact rod and the complementary contact.
Claim 3
Dependent Claim
33 words
The circuit breaker of claim 1 in which said operating means for said bushing comprises: a driving linkage; a clevis carried by said bushing; a connection between said driving linkage and said clevis.
Claim 4
Dependent Claim
41 words
The circuit breaker of claim 2 wherein said last mentioned connection includes a bell-crank lever; one end of said bell-crank lever being connected to said driving linkage; the other end of said bell-crank lever having an extension received in said clevis.
Claim 5
Dependent Claim
37 words
The circuit breaker of claim 1 having an electrical connector for said contact rod; said contact rod being movable with respect to said electrical connector; and additional sliding contacts between said electrical connector and said contact rod.
Claim 6
Dependent Claim
29 words
The circuit breaker of claim 1 having an electrical connector for said contact rod; additional sliding contacts carried by said electrical connector and in engagement with said contact rod.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |