US7956307B2
Active / In Force
US
⏱️ 1.8 years remaining
Circuit breaker having automatic release linkage
Assignee: LS Electric Co Ltd
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Filing: 2008-08-12
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Granted: 2011-06-07
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Expires: 2028-08-12
Abstract
Abstract Disclosed is a circuit breaker having an automatic release linkage capable of preventing damage and deformation of elements by automatic linkage release before electro-impulsive force generated from within the circuit breaker by a large short-circuit current causes the damage and deformation of open/close linkage.
Inventors
- 👤 Kil Young Ahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:08
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/74; H01H77/00; H01H77/02; H01H77/10; H01H77/101; H01H71/10; H01H71/12; H01H71/24; H01H71/26; H01H71/50; H01H71/505; H01H2071/506; H01H2071/507
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
271 words
A circuit breaker having an automatic release linkage including a movable conduction unit ( 3 ) for selectively conducting a first terminal ( 2 ) and a second terminal ( 1 ) by contacting the second terminal ( 1 ) while being electrically contacted to the first terminal ( 2 ), and an open/close linkage including a connection linkage ( 140 ) for transmitting a impact force from the movable conduction unit ( 3 ) to a trip roller ( 55 ) as an operational force, the circuit breaker comprising: an open lever ( 190 ); a second link ( 160 ) rotatably formed about a latch pin ( 150 a ); a third link ( 170 ) having a meshed lateral cross-sectional surface by being latched with an outer circumferential surface of the open lever ( 190 ) while moving relative to the second link ( 160 ) by rotatably fixing the trip roller ( 55 ); and a spring ( 180 ) so interposed between the second link ( 160 ) and the third link ( 170 ) as to apply an elastic force (Fs) toward an operational line ( 99 ), wherein a branch force ( 77 p ) toward the operational line of an operational force ( 77 ) reacts in opposition to the elastic force (fs), and a latched state of a lateral cross-sectional surface of the third link ( 170 ) with the open lever ( 190 ) is released at all times under any circumstance when the branch force ( 77 p ) is greater than the elastic force (fs) by a predetermined level.
Claim 2
Dependent Claim
271 words
A circuit breaker having an automatic release linkage including a movable conduction unit ( 3 ) for selectively conducting a first terminal ( 2 ) and a second terminal ( 1 ) by contacting the second terminal ( 1 ) while being electrically contacted to the first terminal ( 2 ), and an open/close linkage including a connection linkage ( 140 ) for transmitting a impact force from the movable conduction unit ( 3 ) to a trip roller ( 55 ) as an operational force, the circuit breaker comprising: an open lever ( 190 ); a second link ( 160 ) rotatably formed about a latch pin ( 150 a ); a third link ( 170 ) having a meshed lateral cross-sectional surface by being latched with an outer circumferential surface of the open lever ( 190 ) while moving relative to the second link ( 160 ) by rotatably fixing the trip roller ( 55 ); and a spring ( 180 ) so interposed between the second link ( 160 ) and the third link ( 170 ) as to apply an elastic force (Fs) toward an operational line ( 99 ), wherein a branch force ( 77 p ) toward the operational line of an operational force ( 77 ) reacts in opposition to the elastic force (fs), and a latched state of a lateral cross-sectional surface of the third link ( 170 ) with the open lever ( 190 ) is released at all times under any circumstance when the branch force ( 77 p ) is greater than the elastic force (fs) by a predetermined level.
Claim 3
Dependent Claim
83 words
The circuit breaker as claimed in claim 1 , wherein the second link ( 160 ) is protrusively formed at a lateral surface thereof with a friction pin ( 161 ), and the third link ( 170 ) is piercingly formed with an oblong hole ( 172 ) in which the friction pin ( 161 ) can be inserted lengthwise at a lateral surface facing the second link ( 160 ) so as to move relative to the second link ( 160 ).
Claim 4
Dependent Claim
91 words
The circuit breaker as claimed in claim 1 , wherein the connection link ( 140 ) is formed with a stopper surface ( 140 c ) at a surface contacting the trip roller ( 55 ), where the stopper surface ( 140 c ) prevents a further movement of the connection link ( 140 ) contacting the trip roller ( 55 ) when there is generated a relative movement of the connection link ( 140 ) as long as a predetermined distance by the reaction of impact force ( 88 ).
Claim 5
Dependent Claim
72 words
The circuit breaker as claimed in claim 1 , wherein the third link ( 170 ) comprises: a curved surface ( 170 a ) at a lateral cross-sectional surface contacting the open lever ( 190 ) for being meshed with an outer circumferential surface of the open lever ( 190 ); and a point-tipped apex ( 170 b ) formed at a distal end of the curved surface ( 170 a ).
Claim 6
Dependent Claim
40 words
The circuit breaker as claimed in claim 1 , wherein the oblong hole ( 172 ) formed at the third link ( 170 ) is in parallel with the operational line ( 99 ) of the spring ( 180 ).
Claim 7
Dependent Claim
75 words
The circuit breaker as claimed in claim 1 , wherein the third link ( 170 ) further comprises a pair of spring seats ( 181 ) formed at each side of the second link ( 160 ) for being fixedly disposed between a pair of third links ( 170 ), where the spring ( 180 ) is compressively or extendably formed between the spring seat ( 181 ) and the second link ( 160 ).
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2014-06-06 | 2014-12-06 | 2015-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2018-06-06 | 2018-12-06 | 2019-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2022-06-06 | 2022-12-06 | 2023-06-07 | $7700.00 | Window Closed / Lapsed |