Patent US3752947A successfully refreshed from Google Patents.
US3752947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auxiliary mechanism for operating handle of circuit breaker
Assignee: ITE Imperial Corp
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Filing: 1972-07-27
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Granted: 1973-08-14
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Expires: 1992-07-27
Abstract
Abstract An auxiliary handle mechanism for operating a multipole circuit breaker is provided with a pair of links that transmits operating forces from a relatively long main operating handle to a relatively short circuit breaker handle extension. The main handle and links move in planes generally parallel to the front of the circuit breaker, and the circuit breaker handle moves in a plane generally perpendicular to the front of the circuit breaker. The links are interconnected by a pin-roller means including a follower portion disposed in a cam slot. The latter is designed so that the relative effective lengths of the links change by virtue of the changing position of the connecting pin means relative to the fixed pivots of both links as for different positions of the main handle. The configuration of the cam slot is such that the mechanical advantage achieved by the auxiliary mechanism increases and decreases as the force requirements for operating the contact operating mechanism increase and decrease. As the mechanical advantage is reduced, the motion disadvantage is also reduced.
Inventors
- 👤 A Strobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:23
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/50; H01H71/56; H01H2071/565; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18888
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
252 words
The combination comprising a circuit breaker and an auxiliary handle mechanism mounted thereto; said circuit breaker including an enclosure having a front wall, and a spring powered overcenter toggle contact operating mechanism including a contact operating handle having an extension projecting through an opening in said front wall and mounted for movement in a first plane; said auxiliary handle mechanism including support means, a main link mounted at one end thereof to a first pivot fixed on said support means, a drive link mounted at one end thereof to a second pivot fixed on said support means, connecting means drivingly connecting said links to one another at intersecting portions thereof located in a region generally between said pivots, main operating handle means for applying an operating force to pivot said drive link about said second pivot in a plane generally perpendicular to said first plane with this operating force being transmitted through said connecting means to pivot said main link in a plane generally perpendicular to said first plane, and engaging means carried by said main link at a point intermediate said first pivot and said connecting means to transmit operating force from said main link to said extension of said contact operating handle; and guide means for directing movement of said connecting means in an operating path displaced from arcuate paths about either of said pivots as a center to change the relative effective lengths of said links in a predetermined relationship as the angular position of said drive link changes.
Claim 2
Dependent Claim
252 words
The combination comprising a circuit breaker and an auxiliary handle mechanism mounted thereto; said circuit breaker including an enclosure having a front wall, and a spring powered overcenter toggle contact operating mechanism including a contact operating handle having an extension projecting through an opening in said front wall and mounted for movement in a first plane; said auxiliary handle mechanism including support means, a main link mounted at one end thereof to a first pivot fixed on said support means, a drive link mounted at one end thereof to a second pivot fixed on said support means, connecting means drivingly connecting said links to one another at intersecting portions thereof located in a region generally between said pivots, main operating handle means for applying an operating force to pivot said drive link about said second pivot in a plane generally perpendicular to said first plane with this operating force being transmitted through said connecting means to pivot said main link in a plane generally perpendicular to said first plane, and engaging means carried by said main link at a point intermediate said first pivot and said connecting means to transmit operating force from said main link to said extension of said contact operating handle; and guide means for directing movement of said connecting means in an operating path displaced from arcuate paths about either of said pivots as a center to change the relative effective lengths of said links in a predetermined relationship as the angular position of said drive link changes.
Claim 3
Dependent Claim
30 words
A combination as set forth in claim 1 in which the predetermined relationship is dictated primarily by differing forces required to move said contact operating handle at different positions thereof.
Claim 4
Dependent Claim
35 words
A combination as set forth in claim 1 in which the guide means comprises cam means on said support means, and said connecting means includes a follower portion in operative engagement with said cam means.
Claim 5
Dependent Claim
32 words
A combination as set forth in claim 3 in which the connecting means includes additional portions riding in first and second longitudinally extending slots in said main and said drive links, respectively.
Claim 6
Dependent Claim
22 words
A combination as set forth in claim 4 in which the follower and additional portions of said connecting means comprise roller means.
Claim 7
Dependent Claim
18 words
A combination as set forth in claim 4 in which the main and drive links comprise plate-like elements.
Claim 8
Dependent Claim
42 words
A combination as set forth in claim 6 in which the support means includes a shallow housing; said main operating handle being disposed in front of said housing and said link being disposed behind said main operating handle and within said housing.
Claim 9
Dependent Claim
30 words
A combination as set forth in claim 7 in which the predetermined relationship is dictated primarily by differing forces required to move said contact operating handle at different positions thereof.
Claim 10
Dependent Claim
40 words
A combination as set forth in claim 7 in which the support means also includes first and second spaced parallel plates disposed within said housing in planes generally perpendicular to the first plane; said links being disposed between said plates.
Claim 11
Dependent Claim
19 words
A combination as set forth in claim 9 in which the cam means comprises aligned slots in said plates.
Claim 12
Dependent Claim
30 words
A combination as set forth in claim 10 in which the predetermined relationship is dictated primarily by differing forces required to move said contact operating handle at different positions thereof.
Claim 13
Dependent Claim
67 words
A combination as set forth in claim 11 in which the engaging means comprises first and second spaced rollers mounted on axes perpendicular to the planes of said plates; and said extension of said contact operating handle including another roller disposed between said spaced rollers and engageable thereby as said main link is pivoted; said another roller being mounted on an axis perpendicular to said first plane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |