JP4278081B2 - Circuit breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaker provided with a structure for displaying an open / closed state of a fixed contact and a movable contact separately from an on / off display of an operation handle.
[0002]
[Prior art]
Conventionally, in a circuit breaker, there is a structure disclosed in Japanese Patent Application Laid-Open No. 10-233153 that displays the open / closed state of a fixed contact and a movable contact separately from the on / off display of the operation handle. Among these, the circuit breaker shown in FIGS. 1 to 5 is connected to and separated from a stationary contact having a stationary contact (1) in the vicinity of the bottom plate portion inside the case (4) and the stationary contact (1) of the stationary contact. A movable contact having a movable contact (2) is disposed horizontally, and a bar-shaped display (13) is erected on the upper surface of the cross bar (3) interlocking with the vertical movement of the movable contact. The display body (13) was allowed to project freely from the display window (15) drilled in the upper plate part (14) of the case (4) in conjunction with the contact.
[0003]
Moreover, the circuit breaker of FIGS. 6-10 has standing the display body (12) at the front-end | tip of a movable contact, and the fixed contact (1) of a fixed contact and the movable contact (2) of a movable contact are in contact. The display body (12) can be seen from the display window (15) drilled in the upper plate (14) of the case (4), and the fixed contact (1) of the fixed contact and the movable contact can be moved. When the contact (2) is open, the display body (12) cannot be seen from the display window (15) of the case (4).
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned circuit breaker, since the display body (13) is erected on the crossbar (3) that simultaneously drives the movable contacts having a plurality of poles, it is investigated which pole is abnormal when the contacts are welded. I didn't understand it. In addition, since both of the circuit breakers described above and described later have the display bodies (13) and (12) extending from the lower part to the upper part of the case (4), they take up space in the case (4) and are small in size. Could not be incorporated into a circuit breaker.
[0005]
Accordingly, in view of the above problems, an object of the present invention is to provide a circuit breaker that can immediately confirm a pole to which a contact is welded and that can be downsized.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a multi-pole fixed contact having a fixed contact in the vicinity of the upper plate portion inside the case, and a multi-pole movable contact having a movable contact that can be freely contacted and separated from the fixed contact of the fixed contact; The display body interlocked with the movement of the movable contact is pivotally supported in the case so that it can rotate for each pole, and the display body is movable from the display window drilled in the upper plate of the case. The position of the contact can be displayed.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
A multi-pole fixed contact having a fixed contact in the vicinity of the upper plate portion inside the case of the circuit breaker and a multi-pole movable contact having a movable contact that can be contacted and separated from the fixed contact of the fixed contact are provided. The display body interlocking with the movement of the movable contact is pivotally supported in the case so as to be rotatable for each pole, and the position of the movable contact of each pole from the display window formed in the upper plate of the case. Can be displayed.
[0008]
【Example】
An embodiment of a circuit breaker according to the present invention will be described with reference to the accompanying drawings of FIGS.
[0009]
A fixed contact 3 having a fixed contact 3a and a movable contact 4 having a movable contact 4a that can be freely contacted and separated from the fixed contact 3a of the fixed contact 3 in the vicinity of the upper plate 2a inside the case 2 of the circuit breaker 1. However, the base end is arranged in the vertical direction with the bottom plate portion 2b side of the case 2 and the tip end on the top plate portion 2a side of the case 2.
[0010]
The base end of the fixed contact 3 is electrically connected to the connection terminal 5 disposed at one end of the case 2, and the base end of the movable contact 4 is connected to the connection terminal 5 disposed at the other end of the case 2. It is electrically connected to form a main circuit.
[0011]
The movable contact 4 is biased in a direction to be separated from the fixed contact 3 by a spring 6, and when the operation handle 7 protruding from the upper plate portion 2 a of the case 2 is operated and turned on, the movable contact 4 is movable via the opening / closing mechanism portion 8. The main circuit is energized by pressing the contact 4 against the fixed contact 3 against the force of the spring 6 and pressing the movable contact 4a against the fixed contact 3a.
[0012]
Further, when an abnormality such as an overcurrent, a short circuit, or a leakage occurs in the main circuit, the tripping mechanism 9 is driven to release the pressing to the movable contact 4 by the opening / closing mechanism 8 and the fixed contact 3 by the spring 6 is released. The movable contact 4 is separated from the main circuit and the main circuit is cut off.
[0013]
A display body 10 is pivotally supported between the tip of the movable contact 4 of each pole and the upper plate portion 2a of the case 2, and "ON" is provided on the surface of the arc-shaped portion at the tip of the display body 10. “OFF” is displayed. A coil spring 11 having both ends stretched is pivotally supported on the pivot of the display body 10, one end of the coil spring 11 is locked to the display body 10, and the other end is locked to a protrusion 2 c in the case 2.
[0014]
A display window 2d is formed in the upper plate portion 2a of the case 2 so that the display of the display body 10 can be seen.
[0015]
When the fixed contact 3a of the fixed contact 3 and the movable contact 4a of the movable contact 4 are in contact with each other, the display body 10 is moved by the force of the coil spring 11 to display ON from the display window 2d. When the movable contact 4a of the movable contact 4 is separated from the fixed contact 3a of No. 3, the tip of the movable contact 4 moves the display body 10 against the force of the coil spring 11, and displays OFF from the display window 2d. It is supposed to let you. For this reason, when the fixed contact 3a and the movable contact 4a are welded, even if the operation handle 7 is turned off, the display of the display body 10 is turned on, so that the contact abnormality can be confirmed. In addition, since the display body is provided for each movable contact of each pole, the pole to which the contacts are welded can be easily identified.
[0016]
Note that the display body is pivotally supported in the case so as to be interlocked with the movement of the movable contact, and the shape is not limited as long as the display is possible.
[0017]
【The invention's effect】
As described above, the multi-pole fixed contact having a fixed contact in the vicinity of the upper plate portion inside the case and the multi-pole movable contact having a movable contact that can be freely contacted and separated from the fixed contact of the fixed contact are arranged. The display body interlocked with the movement of the movable contact is pivotally supported in the case so as to be rotatable for each pole, and the display body is movable from the display window formed in the upper plate of the case. Since the display body is provided for each movable contact of each pole, the pole where the contact is welded can be immediately confirmed. In addition, since the fixed contact and the movable contact are disposed on the upper portion of the case and the display body does not take up space, the circuit breaker can be miniaturized.
[Brief description of the drawings]
1A and 1B show a state in which a contact of a circuit breaker according to the present invention is closed, FIG. 1A is a plan view, and FIG. 1B is a cross-sectional view taken along line AA in FIG.
FIGS. 2A and 2B show a state in which the contact of the circuit breaker according to the present invention is opened, FIG. 2A is a plan view, and FIG. 2B is a cross-sectional view taken along line CC in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Circuit breaker 2 ... Case 2d ... Display window 3 ... Fixed contact 3a ... Fixed contact 4 ... Moveable contact 4a ... Moveable contact 6 ... Spring 10 ... Display body 11 ... Coil spring

Claims (1)

  A movable contact having a plurality of poles having a fixed contact in the vicinity of the upper plate portion inside the case and a movable contact having a plurality of poles having a movable contact that can be contacted with and separated from the fixed contact of the fixed contact are disposed. A display body interlocking with the movement of the contact is pivotally supported in the case so as to be rotatable for each pole, and the movable contact of each pole is displayed from a display window formed in the upper plate of the case. A circuit breaker characterized in that the position of the circuit can be displayed.

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