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US 4,888,570 AGranted
Circuit breaker
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorHaruhisa Toda
Life of this patent
Estimating the term…
Abstract
In a trip relay mechanism (50) of circuit breaker wherein a latch (23A), a latch lever (25A) and a trip bar (34) are urged to engage with each other; the trip bar (34) is disposed between the latch (23A) and the latch lever (25A) in the direction of power source side-load side of the circuit breaker and they (23A, 25A, 34) are urged by one double-torsion spring (35), and further the trip bar (34) is separated into a main part (34B) extended over each pole and a latching part (34A) for engaging the latch lever (25A).
Claims7
A circuit breaker, comprising:
- a case;
- a fixed contact, fixedly mounted to said case;
- a movable contact, which is pivotally mounted to said case and is movable to be connected with said fixed contact;
- opening/closing operation means, which is pivotally mounted to said case for disconnecting/connecting said movable contact from/with said fixed contact and is biased to disconnect said movable contact from said fixed contact;
- a latch, which is pivotally mounted to said case and is biased to engage with said opening/closing operation means;
- a latch lever, which is pivotally mounted to said case is biased to engage with said latch;
- a trip bar, which is pivotally mounted to said case and is biased to engage with said latch lever;
- and
- an automatic trip device for causing said trip bar to disengage from said latch lever when a current greater than a predetermined value flows through said circuit breaker thereby to cause said movable contact to disconnect from said fixed contact wherein a pivot of said trip bar is disposed between a pivot of said latch and a pivot of said latch lever, in a direction of power source side - load side of said case.
6 more elements
A circuit breaker, comprising:
- a case;
- a fixed contact, fixedly mounted to said case;
- a movable contact, which is pivotally mounted to said case and is movable to be connected with said fixed contact;
- opening/closing operation means, which is pivotally mounted to said case for disconnecting/connecting said movable contact from/with said fixed contact and is biased to disconnect said movable contact from said fixed contact;
- a latch which is pivotally mounted to said case and is biased to engage with said opening/closing operation means;
- a latch lever which is pivotally mounted to said case and is biased to engage with said latch;
- a trip bar which is pivotally mounted to said case between said latch and said latch lever in a direction of power source side - load side of said case and is biased to engage with said latch lever;
- a double-torsion spring which is mounted around a shaft of said latch and biases said latch, said latch lever and said trip bar;
- and
- an automatic trip device, for causing said trip bar to disengage from said latch lever when a current greater than a predetermined value flows through said circuit braker, thereby to cause said movable contact to disconnect form said fixed contact.
7 more elements
A circuit breaker, comprising:
- a case;
- a fixed contact, fixedly mounted to said case.
- a movable contact, which is pivotally mounted to said case and is movable to be connected with said fixed contact;
- opening/closing operation means, which is pivotally mounted to said case for disconnecting/connecting said movable contact from/with said fixed contact and is biased to disconnect said movable contact from said fixed contact;
- a trip relay unit, comprising a latch which is pivotally mounted to said case and is biased to engage with said opening/closing operation means, a latch lever which is pivotally mounted to said case and is biased to engage with said latch, a trip bar which is pivotally mounted to said case at a location, between said latch and said latch lever in a direction of power source side - load side of said case and is biased to engage with said latch lever, and a double-torsion spring which biases said latch, said latch lever and said trip bar;
- and
- an automatic trip device, for causing said trip bar to disengage from said latch lever when a current of greater than a predetermined value flows through said circuit breaker, thereby to cause said movable contact to disconnect from said fixed contact.
4 more elements
Dependencies are inferred from the claim text.