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Patent US4037184A successfully refreshed from Google Patents.
US4037184A
Expired / Lapsed
US
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Lockout and cover interlock for circuit breaker
Assignee: ITE Imperial Corp
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Filing: 1976-04-09
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Granted: 1977-07-19
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Expires: 1996-04-09
Abstract
Abstract A molded case multi-pole circuit breaker is provided with a solid state trip unit having removable and replaceable rating plug. A mechanical interlock trips the circuit breaker when a cover portion thereof is opened. This cover portion must be opened to gain access to the rating plug. A mechanical lockout device is actuated when rating plug is removed to maintain the breaker tripped and to prevent resetting thereof until a rating plug is reinserted in the trip unit.
Inventors
- 👤 Francis W. Kempisty, Jr.
- 👤 John L. Lundgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:29
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/12; H01H71/126; H01H71/74; H01H71/7409
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
193 words
A multi-pole molded case circuit breaker including cooperating contact means; an operating mechanism for opening and closing said contact means; latch means for maintaining said mechanism in a reset condition; solid state trip means including circuitry for processing fault signals derived from currents flowing through said circuit breaker; said trip means including a removable and replaceable first means including an element of said circuitry which controls rating characteristics thereof; a housing wherein said contact means, said mechanism, said latch means and said trip means are disposed; interlock means biased to a first position in operative engagement with said latch means to release the latch and thereby trip said mechanism; said housing including cover means which when in a closed position operating said interlock means to a second position wherein said latch means is permitted to be returned to a latching position; lockout means biased to a first position in operative engagement to block movement of said latch means to its said latching position; said first means when operatively connected in said circuitry operating said lockout means to a second position wherein said latch means is permitted to be returned to said latching position.
Claim 2
Dependent Claim
193 words
A multi-pole molded case circuit breaker including cooperating contact means; an operating mechanism for opening and closing said contact means; latch means for maintaining said mechanism in a reset condition; solid state trip means including circuitry for processing fault signals derived from currents flowing through said circuit breaker; said trip means including a removable and replaceable first means including an element of said circuitry which controls rating characteristics thereof; a housing wherein said contact means, said mechanism, said latch means and said trip means are disposed; interlock means biased to a first position in operative engagement with said latch means to release the latch and thereby trip said mechanism; said housing including cover means which when in a closed position operating said interlock means to a second position wherein said latch means is permitted to be returned to a latching position; lockout means biased to a first position in operative engagement to block movement of said latch means to its said latching position; said first means when operatively connected in said circuitry operating said lockout means to a second position wherein said latch means is permitted to be returned to said latching position.
Claim 3
Dependent Claim
34 words
A multi-pole molded case circuit breaker as set forth in claim 1 in which said cover means must be open in order to gain access to said first means for removal and replacement thereof.
Claim 4
Dependent Claim
45 words
A multi-pole molded case circuit breaker as set forth in claim 2 in which the interlock means is pivotally mounted on a pin means; a control accessible for operation from outside the housing to trip said latch means; said pin means operatively positioning said control.
Claim 5
Dependent Claim
23 words
A multi-pole molded case circuit breaker as set forth in claim 3 in which the control is depressible for tripping said latch means.
Claim 6
Dependent Claim
54 words
A multi-pole molded case circuit breaker as set forth in claim 2 in which there is a first biasing means urging the interlock means to its said first position; said first biasing means generating sufficient energy to trip said latch means and said second biasing means generating insufficient energy to trip said latch means.
Claim 7
Dependent Claim
45 words
A multi-pole molded case circuit breaker as set forth in claim 5 in which the interlock means is pivotally mounted on a pin means; a control accessible for operation from outside the housing to trip said latch means; said pin means operatively positioning said control.
Claim 8
Dependent Claim
23 words
A multi-pole molded case circuit breaker as set forth in claim 6 in which the control is depressible for tripping said latch means.
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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |