Circuit breaker
A circuit breaker and circuit technology, applied in circuits, electrical switches, electrical components, etc., can solve problems such as low efficiency and insufficient separation force
Active Publication Date: 2007-10-17
FUJI ELECTRIC FA COMPONENTS & SYST CO LTD
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Problems solved by technology
[0019] Moreover, the contact part separation action is only a function of manually releasing the state of the lock pin through the manual operation of the handle. In the energized state where the contacts are melted, the lock pin is released by the tripping action of the overcurrent tripping device. Next, although the work is started by the forced opening operation of the handle after the tripping action, in this case, as described above, since the efficiency of converting the elastic force of the switch spring into the rotational moment of the upper link is very low, it cannot get enough force to leave
Method used
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[0041] Hereinafter, an embodiment of the present invention will be described in detail based on the examples shown in FIGS. 1 to 7 . However, in the drawings of the embodiment, the same reference numerals are assigned to components corresponding to those in FIGS. 8 to 11 , and description thereof will be omitted.
[0042] First, Fig. 1(a) is an internal structure diagram showing the entire circuit breaker, and Fig. 1(b) and Fig. 2 show the pivot support structure between the lock pin of the opening and closing mechanism and the upper link of the toggle lever. That is, the opening and closing mechanism in the circuit breaker of the illustrated embodiment is basically the same as the structure of Patent Document 1 shown in FIG. The left side of the upper link 12) is provided with a stop piece 8a whose front end is bent into a Japanese pseudonym "ㄑ" shape, and a convex cam 12a is formed on the side edge of the upper link 12 opposite to the stop piece 8a (refer to FIG. 1 (b)).
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The invention provides an open / closing mechanism of the circuit breaker, including handspike connected to the operating handle; a lockpin whose terminal shaft is supported on the pivot shaft and locked to the lockpin bearing part; toggle link formed by top connecting bar and lower connecting bar through toggle link bar, whose another terminal pivot of respective connecting bar is supported on the lockpin and contact element fixer; and switch spring between the toggle link pin and handspike set by drawing frame for opening and closing the main circuit connection point by the OM / OFF switch of the handle and releasing connecting bar by the excess current detection to make the open / closing mechanism process tripping action, in which the connecting shaft on the lockpin is enbeded into the top terminal of the top connecting bar to form a U-shaped open bearing part which is able to sliably pivoted joint. The tripping action among the fixing / moving connection points in the molten state is not interrupted by the top connecting bar and making the recovery elasticity of the switch spring directly act on the toggle link pin so as to enhance the leaving force of the molten connecting point and improve the reliability of the breaking action.
Description
technical field [0001] The present invention relates to circuit breakers targeted at wiring circuit breakers, earth leakage circuit breakers, and the like. Specifically, the present invention relates to a structure of a circuit breaker opening and closing mechanism. Background technique [0002] In the above-mentioned circuit breaker, in the energized state where the main circuit contact is closed, if the fixed contact and the movable contact become molten due to abnormal pulse current, etc., even if the overcurrent tripping device (overcurrent tripping device) is normal Work, the main circuit contact will also release the latch of the switch mechanism in the closed state, so that the operating handle moves from the ON position to the TRIP position and stops. [0003] In this case, if the handle can be moved to the OFF position in the molten state of the contact, it will be mistaken for the main circuit contact of the circuit breaker to be in the open state. If the maintenan...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H01H71/50H01H71/52H01H71/12
CPCH01H71/501H01H71/525H01H3/42H01H23/146H01H71/52
Inventor 外山健太郎浜田佳伸佐藤佑高
Owner FUJI ELECTRIC FA COMPONENTS & SYST CO LTD