JP2559969Y2 - Circuit breaker trip device - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a tripping device of a circuit breaker, and more specifically, a tripping device of a circuit breaker having a trip button for confirming a function of a trip device. About.

[Conventional technology]

When an excessive current flows in the main circuit, the electromagnetic trip section of the overcurrent trip device operates to trip the latch with the trip crossbar, and to open the contacts at the various circuit breakers. Is conventionally known. FIG. 4 shows an example of a tripping device for such a circuit breaker. Here, 1 is a handle for manually turning on and off the circuit breaker, 2 is its handle lever, 3 is connected to the handle lever 2 and is a latch involved in the tripping operation, 4 is a latch 3 and a toggle link. 5 is a movable contact block having a movable contact 4A connected thereto via a reference numeral 5; a cross bar 6 for releasing the engagement state with the latch 3 via a trip lever 7 when an overcurrent is tripped; Reference numeral 9 denotes an opening / closing spring, and 9 denotes an armature that is attracted by an electromagnetic force generated in the electromagnetic trip section 10 when an overcurrent occurs and turns the crossbar 6 in the direction of the arrow.

In such a circuit breaker, it is possible to perform an operation to release the set state of the trip device without actually flowing an overcurrent for the purpose of testing whether the trip device operates normally or not. A trip button 12 is provided on a cover 11 near the upper portion where the armchair 9 is provided, and when the button 12 is pressed against the spring force of the spring 13, the armature chair 9 is turned at its tip. By rotating around the driving shaft 14 and operating the crossbar 6 as shown in FIG. 5, the engagement between the latch 3 and the trip lever 7 is released, and the opening operation by the movable contact table 4 can be performed. . Reference numeral 15 denotes a fixed contact.

[Problems to be solved by the invention]

However, in the above-described conventional tripping device for a circuit breaker, the trip button 12 is used to depress the armchair 9 from above and rotate the crossbar 6 to try the tripping operation. When the armature chair 9 is attracted to the iron core of the electromagnetic trip portion 10, its operation is limited, so that the trip stroke cannot be made large. There was a possibility that the other was deformed and damaged. In the case of the electromagnetic trip device, a charged portion is formed, so that it is necessary to maintain a sufficient insulation distance between the armature chair 9 and the tip of the trip button 12, and to secure a sufficient height, a circuit is required. This hindered downsizing of the circuit breaker.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tripping device for a circuit breaker that eliminates the above-mentioned drawbacks of the related art and enables a trial operation by directly operating a crossbar without requiring excessive force by a trip button. It is in.

[Means for solving the problem]

In order to achieve this object, the present invention relates to an electromagnetic coil unit that starts an tripping operation by pulling an armature chair when an overcurrent occurs, and a part of an opening / closing mechanism that opens and closes a pole through a crossbar. A trip unit that holds the open / close mechanism in a closed state by maintaining the engagement state, and releases the engaged state of the crossbar with the open / close mechanism in conjunction with the armature chair during the trip operation to perform an opening operation. A trip button capable of causing the opening / closing mechanism to perform an opening operation via the trip section manually from the outside, wherein the trip button is provided at a drive end thereof. The crossbar has a pressing portion located on the axis of the trip button, and the crossbar is formed on the tapered surface by the pressing operation of the trip button. Presses the pressing portion of those characterized by being configured to push in the direction perpendicular to the operating direction of the trip button pressing portion of the cross bar.

[Action]

According to the present invention, the pushing operation of the trip button causes the wedge-shaped tapered surface formed at the tip of the trip button to operate while maintaining contact with the crossbar, and release the set state of the tripping section regardless of the armature chair. As a result, the opening and closing mechanism can perform the opening operation.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. Where 16
Is a crossbar that is rotatable around the pin 16A, is located on the axis of the trip button 18, and is pushed out on the inclined surface 18A in a direction orthogonal to the operation direction of the trip button 18 by pressing the trip button 18. It has a pressing part,
As shown in the figure, in the set state where the circuit is kept closed, the trip lever 17 and the crossbar 16 hold the latch 3 at the trip portion 17 in the engaged state. Reference numeral 18 denotes a trip button according to the present invention. As shown in FIGS. 2A and 2B, the trip button 18 is formed in a wedge shape having an inclined surface 18A whose tip is inclined at, for example, approximately 45 °. ,
The wedge-shaped inclined surface 18A is located just above the crossbar 16.

Therefore, in the trip trial operation of releasing the set state by the trip button 18, the trip button as shown in FIG.
By pressing down 18, the inclined surface 18A at the tip of the
After being brought into contact with 6, the crossbar 16 can be rotated in the direction of the arrow by the wedge action of the inclined surface 18A. When the cross bar 16 is rotated, the engagement between the trip lever 7 and the latch 3 is released at the trip portion 17 together with the trip lever 7, and the latch 3 shown in FIG.
The movable contact table 4 can be operated by the spring force of (1) to open the contact. In this case, the armature chair 9 is maintained in the same position by the trip button 18 irrespective of the pressing operation. Therefore, it is not necessary to maintain the insulation distance between the tip of the trip button and the armchair as in the related art. .

[Effect of the invention]

As described above, according to the present invention, the trip button can be directly driven by the trip button, and the trip portion can be tripped via the crossbar, so that the conventional device can be operated. In order to operate the armchair at the same time, it is not necessary to secure the space provided between the armchair and the tip of the trip button for insulation, and the height of the case and therefore the height of the circuit breaker itself can be reduced accordingly. It has become possible.

Further, the drive tip of the trip button is formed in a wedge shape, and the taper surface of the trip button presses the pressing portion of the crossbar by pressing the trip button, and the pressing portion of the crossbar is orthogonal to the operation direction of the trip button. Since the push button is pushed out in the direction, a large load is not applied to the tip of the trip button, and the trip button can be prevented from being damaged.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of the configuration of the circuit breaker according to the present invention. FIGS. 2A and 2B are front and side views showing an example of the shape of the trip button shown in FIG. 1, and FIG. Is an explanatory view of the operation according to the present invention, FIG. 4 is a sectional view showing an example of the configuration of a conventional circuit breaker, and FIG. 5 is an explanatory view of the operation of the conventional example. 1 ... handle, 3 ... latch, 4 ... movable contact block, 9
… Armature chair, 10… Electromagnetic trip unit, 16… Crossbar, 17… Trip unit, 18… Trip button, 18A
…… Slope.

Claims (1)

(57) [Scope of request for utility model registration] An armature that attracts an armature to start a tripping operation when an overcurrent occurs, and a part of an opening / closing mechanism that opens and closes a pole and maintains a state of engagement through a crossbar. A trip button capable of holding the opening / closing mechanism in a closed state and releasing the engaged state of the crossbar with the opening / closing mechanism in conjunction with the armature during the tripping operation to perform the opening operation. In the tripping device for a circuit breaker, the trip button has a wedge-shaped tapered surface formed at a driving end thereof, the crossbar has a pressing portion located on an axis of the trip button, By pressing the trip button, the pressing portion of the crossbar is pressed by the tapered surface to push the pressing portion of the crossbar in a direction orthogonal to the trip button operation direction. DOO trip unit of a circuit breaker according to claim.