JPH097488A - Circuit breaker for wiring - Google Patents

Abstract

PURPOSE: To prevent a stranded wire from being cut by being sandwiched in a mechanism part by pressing down the stranded wire constituting a cable way by a conductive plate for an arc current passage fixed to a case. CONSTITUTION: An almost central part of a stranded wire 3 to connect a movable contactor 1 and bimetal 2 or the like to each other, is hookingly engaged with an engaging part 9 formed on a conductive plate 7 for an arc current passage. Therefore, when the contactor 1 performs opening-closing operation, the stranded wire 3 can be prevented from being cut by being sandwiched in a cradle or the like constituting a mechanism part. Since connection of the conductive plate 7 and a terminal 10 can be performed by the stranded wire 3, an incorporating structure of the conductive plate 7 can be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a circuit breaker for wiring having a twisted wire connecting a contactor and a bimetal or the like.

[0002]

2. Description of the Related Art In general, a stranded wire is used as a part of an electric path inside a circuit breaker for wiring, and in FIG. 6, there is flexibility for connecting a movable contact 1 to a bimetal 2 or the like. The stranded wire 3 is provided with some space. However, the stranded wire 3 may be pushed upward when the movable contact 1 is moved to the bimetal 2 side due to the opening / closing operation of the wiring break, and may be caught in the cradle or the like that constitutes the mechanical portion. If such pinching occurs, the stranded wire 3 at that portion may be damaged, and the wire 3 may be broken during repeated opening and closing operations.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art and to provide a circuit breaker for wiring in which the stranded wire forming the electric path is prevented from being caught in the mechanical portion. It is a thing.

[0004]

The wiring breaker of the first invention made to solve the above problems is an arc in which a stranded wire connecting a contactor and a bimetal is fixed in a case. It is characterized in that the stranded wire is prevented from being caught in the mechanical portion by being pressed by the current path conductive plate. In addition, the second that was made to solve the same problem
The circuit breaker for wiring according to the invention is characterized in that the twisted wire connecting the contact and the bimetal or the like is pressed by the twisted wire engaging portion to prevent the twisted wire from being caught in the mechanism portion. .

[0005]

According to these inventions, the stranded wire is held by the conductive plate for the arc current passage and the stranded wire engaging portion, so that the stranded wire forming the electric path is not caught in the mechanical portion, and the stranded wire breaks. It is possible to eliminate the fear of. Further, according to the first aspect of the invention, since the conductive plate for arc current passage and the terminal can be connected by the twisted wire, there is also an advantage that the structure for assembling the conductive plate for arc current passage becomes simple.

[0006]

The present invention will be described below in more detail with reference to the embodiments shown in the drawings. 1 and 2 show an embodiment of the first invention, in which 1 is a movable contactor, 2 is a bimetal,
Reference numeral 3 is a flexible stranded wire that connects the movable contact 1 and the bimetal 2. The stranded wire 3 is provided with some allowance so that the opening / closing operation of the movable contact 1 can be performed without any hindrance.

Reference numeral 4 denotes an arc runner extending from the fixed contact 5 side along the bottom surface of the case 6, and reference numeral 7 denotes an arc current conducting plate provided in parallel above the arc runner 4. These members serve to absorb the arc generated at the moment when the movable contact 8 at the tip of the movable contact 1 separates from the fixed contact 5.

According to the first aspect of the invention, the movable contact 1 is engaged with the arc current conducting plate 7 by the engaging portion 9 formed as shown in FIG. The stranded wire 3 is prevented from being caught in a cradle or the like that constitutes the mechanical portion even when the open / close operation is performed.
As a result, it is possible to prevent the stranded wire 3 from being cut as in the conventional case.

Of course, the arc current conducting plate 7 must be electrically connected to the wire connecting terminal 10. Therefore, conventionally, the end of the conductive plate 7 for energizing the arc current is extended upward as shown in FIG. 6 and fixed by a fixing screw 11 or the like. According to the present invention, the arc is provided via the twisted wire 3. Since the current-carrying conductive plate 7 and the wire connecting terminal 10 are electrically connected, the arc current-carrying conductive plate 7 is simply used.
It suffices to attach the to the case 6. Therefore, there is an advantage that a complicated mounting structure as in the past is not required.

The engaging portion 9 of the conductive plate 7 for passing the arc current is
It is preferable that the arc current is provided in a position where the direction of the arc current flows in the direction opposite to that of the arc runner 4 as shown by the arrow in FIG. 1. In the embodiment, the arc current conducting plate 7 is provided at an end portion near the movable contact 1. Has been formed. This structure has the effect of further extending the arc and improving the arc voltage. Further, by forming the arc current conducting plate 7 with a high resistance material such as nichrome, the arc voltage is further improved and the current limiting effect can be enhanced.

Further, as shown in FIG. 3, the arc current carrying conductive plate 7 having the engaging portion 9 of the stranded wire 3 is instantly yoked 12.
If integrated with, the number of parts can be reduced and the configuration can be further simplified. As a result, the assemblability is improved and the number of steps can be reduced.

FIGS. 4 and 5 show an embodiment of the second invention, in which the substantial center portion of the twisted wire 3 is pressed by a twisted wire engaging portion 13 projecting from the case 6 so that the twisted wire 3 is This is to prevent it from being caught in the mechanical section. Figure 4 shows Case 6
2 rib-shaped stranded wire engaging parts 13 and case 6 on the opposite side
The wire 4 is engaged with the stranded wire engaging portion 14 protruding from the case 6. In FIG. 5, the stranded wire engaging portion 15 having a semicircular cross section is protruded from the case 6. These twisted wire engaging portions 13, 14, 15 may be formed integrally with the case 6 or may be formed by separate members. The second invention can be carried out by itself, but as shown in FIG.
It can also be implemented in combination with the invention of.

[0013]

As described above, according to the first and second inventions of the present application, the twisted wire forming the electric path is not caught in the mechanical portion, and the break of the twisted wire can be prevented. it can. Further, in particular, when the stranded wire is locked by the conductive plate for passing an arc current as in the first invention, there is an advantage that the entire structure can be simplified.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the first invention.

FIG. 2 is a perspective view showing a main part of an embodiment of the first invention.

FIG. 3 is a sectional view showing another embodiment of the first invention.

FIG. 4 is a perspective view showing a main part of an embodiment of the second invention.

FIG. 5 is a perspective view showing a main part of another embodiment of the second invention.

FIG. 6 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 Movable contactor 2 Bimetal 3 Stranded wire 4 Arc runner 5 Fixed contact 6 Case 7 Conductive plate for energizing arc current 8 Movable contact 9 Engagement part 10 Wire connection terminal 11 Fixing screw 12 Instantaneous yoke 13 Stranded wire engagement part 14 Strand engaging part 15 Strand engaging part

Claims (5)

[Claims] 1. A circuit breaker for wiring, characterized in that a stranded wire forming an electric path is pressed by a conductive plate for arc current passage fixed in a case to prevent the stranded wire from being caught in a mechanism portion. 2. The circuit breaker for wiring according to claim 1, wherein an engaging portion for engaging the stranded wire is provided at an end portion of the conductive plate for arc current passage near the movable contact. 3. The circuit breaker according to claim 1, wherein the conductive plate for arc current passage is formed of a high resistance material such as nichrome. 4. The circuit breaker according to claim 1, wherein the conductive plate for arc current passage is integrated with the instantaneous yoke. 5. A circuit breaker for wiring, characterized in that a stranded wire forming an electric path is pressed by a stranded wire engaging portion to prevent the stranded wire from being caught in a mechanism portion.