US3605051A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Avoidance of switching device false off handle indication
Assignee: General Electric Co
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Filing: 1970-01-22
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Granted: 1971-09-14
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Expires: 1990-01-22
Abstract
Abstract Auxiliary trip device usable with an electrical switching apparatus having a movable contact arm, an operating mechanism including a releasable cradle for moving the contact arm between open and closed circuit positions, and a manually actuatable handle operably connected to the operating mechanism and automatically movable to a trip position upon release of the cradle. The auxiliary trip device is movable responsive to movement of the handle toward OFF position for tripping the cradle when the contact arm is in closed circuit position for avoiding a false OFF handle indication.
Inventors
- 👤 Robert T Casey
- 👤 Keith W Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:55
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/50; H01H71/501
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
149 words
Electrical switching apparatus comprising: a. a stationary contact, b. a movable contact, c. an operating mechanism for moving the movable contact and including a releasable cradle movable into a latched position, and d. a handle movable between OFF and ON positions for manually operating the operating mechanism to move the movable contact between open and closed circuit positions respectively while the cradle is in latched position, e. an auxiliary trip device movable responsive to handle movement from ON position toward OFF position while the cradle is in latched position and the movable contact is in the closed circuit position to cause releaSe of the cradle from latched position, f. said operating mechanism including disabling means engaging said auxiliary trip device when said operating mechanism moves said movable contact to said open circuit position rendering said auxiliary trip device ineffective to cause release of said cradle from said latched position.
Claim 2
Dependent Claim
149 words
Electrical switching apparatus comprising: a. a stationary contact, b. a movable contact, c. an operating mechanism for moving the movable contact and including a releasable cradle movable into a latched position, and d. a handle movable between OFF and ON positions for manually operating the operating mechanism to move the movable contact between open and closed circuit positions respectively while the cradle is in latched position, e. an auxiliary trip device movable responsive to handle movement from ON position toward OFF position while the cradle is in latched position and the movable contact is in the closed circuit position to cause releaSe of the cradle from latched position, f. said operating mechanism including disabling means engaging said auxiliary trip device when said operating mechanism moves said movable contact to said open circuit position rendering said auxiliary trip device ineffective to cause release of said cradle from said latched position.
Claim 3
Dependent Claim
63 words
Electrical switching apparatus as set forth in claim 1 wherein said operating mechanism includes an overcenter tension spring which is normally operative through said operating mechanism to bias said movable contact toward said open circuit position when said handle is in said OFF position and to bias said movable contact toward said closed circuit position when said handle is in said ON position.
Claim 4
Dependent Claim
47 words
Electrical apparatus as set forth in claim 2 wherein said operating mechanism also includes a pair of toggle links movable between collapsed and straightened conditions corresponding to said open and closed circuit positions of said movable contact, said disabling means comprising a part of said toggle linkage.
Claim 5
Dependent Claim
44 words
Electrical apparatus as set forth in claim 2 wherein release of said cradle prevents said tension spring from crossing the pivotal axis of said handle during movement of said handle toward OFF position even if said movable contact remains in its closed circuit position.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |