Patent US3272941A successfully refreshed from Google Patents.
US3272941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overload protected electric switch
Assignee: Stackpole Carbon Co
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Filing: 1964-10-02
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Granted: 1966-09-13
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Expires: 1984-10-02
Abstract
No abstract record available.
Inventors
- 👤 James F Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:08
CPC Classifications
H; H01; H01H; H01H25/00; H01H25/06; H01C; H01C10/00; H01C10/50; H01H73/00; H01H73/22; H01H73/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
237 words
AN OVERLOAD PROTECTED ELECTRIC SWITCH COMPRISING A HOUSING, A PAIR OF FIXED ELECTRIC CONTACTS INSIDE THE HOUSING, ONE OF SAID CONTACTS BEING A CIRCUIT BREAKER CONTACT, A THERMALLY RESPONSIVE BIMETALLIC CONDUCTOR STRIP SECURED AT ONE END TO THE OTHER CONTACT, THE STRIP HAVING A LATERALLY PROJECTING CONTACT END NORMALLY HOOKED ONTO SAID BREAKER CONTACT, SAID STRIP BEING ADAPTED TO BEND AND SPRING AWAY FROM THE BREAKER CONTACT WHEN OVERHEATED BY EXCESSIVE ELECTRIC CURRENT FLOWING THERETHROUGH, A THIRD FIXED CONTACT BESIDE ONE OF SAID PAIR OF FIXED CONTACTS, A MOVABLE BRIDGING CONTACT IN THE HOUSING, A CONTROL SHAFT FOR MOVING THE MOVABLE CONTACT INTO AND OUT OF ENGAGEMENT WITH SAID THIRD CONTACT AND THE FIXED CONTACT BESIDE IT, A RESILIENT RESET STRIP EXTENDING LENGTHWISE OF THE CONDUCTOR STRIP ALONG THE SIDE THEREOF REMOTE FROM SAID CIRCUIT BREAKER CONTACT, MEANS IN THE HOUSING ANCHORING ONE END OF THE RESET STRIP ADJACENT SAID OTHER FIXED CONTACT, THE RESET STRIP BEING SPACED FROM THE OTHER STRIP WHILE SAID CONTACT END IS HOOKED ONTO THE BREAKER CONTACT, AND MEANS ACTUATED BY THE CONTROL SHAFT FOR BENDING THE RESET STRIP TO FORCE ITS FREE END TOWARD THE ADJACENT END OF THE CONDUCTOR STRIP WHEN THE SHAFT IS OPERATED TO OPEN THE SWITCH, WHEREBY IF THE CONDUCTOR STRIP HAS BECOME UNHOOKED FROM THE BREAKER CONTACT THE FREE END OF THE RESET STRIP WILL PUSH CONTACT WND BACK INTO HOOKED-ON ENGAGEMENT WITH THE BREAKER CONTACT.
Claim 2
Dependent Claim
237 words
AN OVERLOAD PROTECTED ELECTRIC SWITCH COMPRISING A HOUSING, A PAIR OF FIXED ELECTRIC CONTACTS INSIDE THE HOUSING, ONE OF SAID CONTACTS BEING A CIRCUIT BREAKER CONTACT, A THERMALLY RESPONSIVE BIMETALLIC CONDUCTOR STRIP SECURED AT ONE END TO THE OTHER CONTACT, THE STRIP HAVING A LATERALLY PROJECTING CONTACT END NORMALLY HOOKED ONTO SAID BREAKER CONTACT, SAID STRIP BEING ADAPTED TO BEND AND SPRING AWAY FROM THE BREAKER CONTACT WHEN OVERHEATED BY EXCESSIVE ELECTRIC CURRENT FLOWING THERETHROUGH, A THIRD FIXED CONTACT BESIDE ONE OF SAID PAIR OF FIXED CONTACTS, A MOVABLE BRIDGING CONTACT IN THE HOUSING, A CONTROL SHAFT FOR MOVING THE MOVABLE CONTACT INTO AND OUT OF ENGAGEMENT WITH SAID THIRD CONTACT AND THE FIXED CONTACT BESIDE IT, A RESILIENT RESET STRIP EXTENDING LENGTHWISE OF THE CONDUCTOR STRIP ALONG THE SIDE THEREOF REMOTE FROM SAID CIRCUIT BREAKER CONTACT, MEANS IN THE HOUSING ANCHORING ONE END OF THE RESET STRIP ADJACENT SAID OTHER FIXED CONTACT, THE RESET STRIP BEING SPACED FROM THE OTHER STRIP WHILE SAID CONTACT END IS HOOKED ONTO THE BREAKER CONTACT, AND MEANS ACTUATED BY THE CONTROL SHAFT FOR BENDING THE RESET STRIP TO FORCE ITS FREE END TOWARD THE ADJACENT END OF THE CONDUCTOR STRIP WHEN THE SHAFT IS OPERATED TO OPEN THE SWITCH, WHEREBY IF THE CONDUCTOR STRIP HAS BECOME UNHOOKED FROM THE BREAKER CONTACT THE FREE END OF THE RESET STRIP WILL PUSH CONTACT WND BACK INTO HOOKED-ON ENGAGEMENT WITH THE BREAKER CONTACT.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |