US3849619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit breaker with reverse override device
Assignee: Westinghouse Electric Corp
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Filing: 1973-06-14
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Granted: 1974-11-19
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Expires: 1993-06-14
Abstract
Abstract A circuit breaker characterized by a pair of contacts operable between open and closed positions and a circuit breaker mechanism releasable to effect opening of the contacts. The mechanism comprising a trip structure and including a trip rod, a crank shaft structure, and associated closing spring means operable to close the pair of contacts, manual trip means operatively connected to the trip rod for tripping the mechanism and comprising a trip member movable between tripped and untripped positions and biased in the untripped position. The crank shaft comprising a cam operable for holding the trip member in the tripped position when the contacts close against a heavy fault current.
Inventors
- 👤 N Patel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:34
CPC Classifications
H; H01; H01H; H01H3/00; H01H3/32; H01H3/42; H01H3/22; H01H3/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
A circuit breaker comprising a pair of contacts operable between open and closed positions, a circuit breaker mechanism releasable to effect opening of said contacts, a trip structure for latching the circuit breaker mechanism in the closed position and for releasing said circuit breaker mechanism, said trip structure comprising a trip shaft operatively connected to said circuit breaker mechanism, a crank shaft structure operable to close said pair of contacts, closing spring means connected to said crank shaft structure, manual trip means operatively connected to said trip shaft for tripping said mechanism and comprising a trip member movable between tripped and untripped positions and biased in the untripped position, a cam on said crank shaft and operable for holding said member in the tripped position when the contacts bounce open in response to an attempt to close against fault currents that are higher than their ability to close and latch the cam having a step surface engageable with said member when the closing spring means are charged, and latch means being mounted on said member for engagement with the step surface of the cam.
Claim 2
Dependent Claim
184 words
A circuit breaker comprising a pair of contacts operable between open and closed positions, a circuit breaker mechanism releasable to effect opening of said contacts, a trip structure for latching the circuit breaker mechanism in the closed position and for releasing said circuit breaker mechanism, said trip structure comprising a trip shaft operatively connected to said circuit breaker mechanism, a crank shaft structure operable to close said pair of contacts, closing spring means connected to said crank shaft structure, manual trip means operatively connected to said trip shaft for tripping said mechanism and comprising a trip member movable between tripped and untripped positions and biased in the untripped position, a cam on said crank shaft and operable for holding said member in the tripped position when the contacts bounce open in response to an attempt to close against fault currents that are higher than their ability to close and latch the cam having a step surface engageable with said member when the closing spring means are charged, and latch means being mounted on said member for engagement with the step surface of the cam.
Claim 3
Dependent Claim
28 words
The circuit breaker of claim 1 wherein the latch means comprises a pin mounted on said trip member and extending into the path of rotation of the cam.
Claim 4
Dependent Claim
23 words
The circuit breaker of claim 2 wherein said member comprises a substantially vertical slot and the pin is slidably movable in the slot.
Claim 5
Dependent Claim
26 words
The circuit breaker of claim 3 wherein the pin is movable to a retracted position in the slot when the closing spring means are being charged.
Claim 6
Dependent Claim
24 words
The circuit breaker of claim 2 wherein the member moves the trip rod to the tripped position when the step surface engages the pin.
References Cited (Backward Citations)
US3569652A
Cited
US3590192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |