JP4050179B2 - Circuit breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaker in which a cassette-type accessory device for sending a signal indicating the on / off state of an overcurrent breaking mechanism as a signal is housed in a breaker case, particularly for signal sending. The present invention relates to a holding structure for lead wires drawn out of the circuit breaker case from the device.
[0002]
[Prior art]
In a circuit breaker with an attached device, various lead wire holding members are used to hold the lead wire drawn out of the breaker case from the attached device at a predetermined position. As this lead wire holding means, there is a structure in which a lead wire is passed through a lead wire holding member made of a synthetic resin material having a long hole penetrating vertically, and the lead wire holding member is sandwiched and fixed between a main cover and an auxiliary cover. Yes (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-10-12118 (FIGS. 4 and 5)
[0004]
[Problems to be solved by the invention]
The conventional circuit breaker is configured as described above, but the elongated hole of the lead wire holding member is sized to pass the lead wire. For example, a crimp terminal is attached to the tip of the lead wire. In some cases, the crimping terminal must be crimped after passing the lead wire through the elongated hole, resulting in poor assembly workability. Further, when the lead wire drawn out of the circuit breaker is pulled or pushed in from the outside to the inside, the holding state of the lead wire may be released or loosened. Depending on the disengaged or slackened state, there is a problem that the soldered portion of the lead wire is peeled off.
[0005]
The present invention has been made to solve the above-described problems. Even when the lead wire is long or a crimp terminal is attached to the tip of the lead wire, the assembly work is easy and the circuit breaker is When the lead wire pulled out to the outside is pulled, or
An object of the present invention is to provide a circuit breaker in which the holding state of the lead wire does not come off or loosen when pushed in from the outside to the inside.
[0006]
[Means for Solving the Problems]
In the circuit breaker according to the present invention, a circuit breaker case including a base and a main cover attached to the base and incorporating an overcurrent breaking mechanism, and an accessory device of the overcurrent breaking mechanism formed on the main cover. A circuit breaker having a recess for accommodating the main cover and an auxiliary cover attached to the main cover to close the recess. The circuit breaker is pulled out from the accessory device to the outside of the circuit breaker on the side wall of the accessory device. A substantially L-shaped locking member that can wind and lock the lead wire is provided, one end of which is an opening for inserting the lead wire, and the other end is a locking portion for winding and locking the lead wire. In addition, a deflection preventing protrusion for suppressing the deflection of the locking member over a predetermined dimension is provided at the opening of the locking member or at the portion facing the opening inside the auxiliary cover. .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 is a perspective view showing a state before an attachment device is mounted in a circuit breaker according to Embodiment 1 of the present invention, FIG. 2 is an enlarged perspective view of an attachment device portion in FIG. 1, and FIG. 3 is an embodiment of the present invention. 4 is a partially broken side view of the circuit breaker according to the first embodiment when the attached device is mounted, FIG. 4 is a partial plan view taken along line AA in FIG. 3, and FIG. 5 is taken from line BB in FIG. FIG.
[0008]
In the figure, a circuit breaker case 11 is composed of a synthetic resin base 11a and a synthetic resin main cover 11b which is detachably attached to the base 11a. Z) is built-in. The auxiliary cover 12 is fixed to the main cover 11b with a screw 13. By this fixing, the auxiliary cover 12 closes the recess 14 in which the attachment device 21 is accommodated. A lead wire 22 for outputting a signal from the accessory device 21 to the outside of the circuit breaker 1 is drawn out from the accessory device 21.
[0009]
The auxiliary cover 12 is provided with a side wall 12a that covers the side surface of the main cover 11b when the auxiliary cover 12 is closed. A hook 21 a that is a locking member for locking the lead wire 22 drawn out from the auxiliary device 21 to the outside of the circuit breaker 1 is provided on the side wall of the auxiliary device 21. The hook 21a is formed in an approximately L shape, one end of which is an opening 21aa into which the lead wire 22 can be inserted, and the other end is a locking portion 21ab in which the lead wire 22 can be wound and locked. The lead wire 22 is pulled out through a gap formed between the side wall 12a of the auxiliary cover 12 and the side surface of the base 11a as shown in FIGS.
[0010]
In the circuit breaker configured as described above, when the lead wire 22 drawn out from the attachment device 21 is pulled out of the circuit breaker 1, the lead wire 22 is wound around the engaging portion 21ab of the hook 21a. Since the lead wire 22 is locked and fixed to the hook 21a, even if the lead wire 22 is pulled in the direction of the mounting surface of the circuit breaker 1 (the direction of the arrow F1 in FIG. 3), the lead wire connecting portion 21b ( For example, no stress is applied to the soldered portion of the lead wire 22. Further, since the hook 21a is formed in an approximately L shape and one end is open, workability when winding the lead wire 22 is good. Further, when the lead wire 22 drawn out of the circuit breaker 1 is pulled or pushed in from the outside to the inside, the holding state of the lead wire is loosened and the soldered portion of the lead wire 22 is peeled off. The problem of doing is also solved.
[0011]
Embodiment 2. FIG.
When the gap between the hook 21a and the side wall 12a of the auxiliary cover 12 is large, a deflection preventing projection 21ac is provided in the opening 21aa portion of the hook 21a as shown in FIG. Is suppressed. That is, when the lead wire 22 is pulled in the lateral direction of the circuit breaker 1 (the direction of the arrow F2 in FIG. 4) by the deflection preventing projection 21ac, the hook 21a is displaced outward as indicated by the broken line, thereby preventing the deflection. Since the protrusion 21ac contacts the inside of the side wall 12a of the auxiliary cover 12 to prevent further displacement, the hook 21a is not broken. Depending on the configuration of the side wall 12a of the attachment device 21 or the auxiliary cover 12, the deflection preventing projection 21ac may be provided inside the side wall 12a of the auxiliary cover 12. However, when the gap between the hook 21a and the side wall 12a of the auxiliary cover 12 is small, the bending prevention protrusion 21ac may not be provided.
[0012]
Embodiment 3 FIG.
As shown in the first and second embodiments, when the lead wire 22 is wound around the hook 21a, the lead wire 22 is locked and fixed to the hook 21a. However, as shown in FIG. If the lead wire loosening prevention rib 12b is provided on the wire, it can be locked and fixed more firmly. That is, when the auxiliary cover 12 is closed, the lead wire 22 wound around the hook 21a is pressed toward the hook 21a by the lead wire slack preventing rib 12b. By this pressing, the lead wire 22 is further firmly locked and fixed.
[0013]
Embodiment 4 FIG.
6 is a perspective view showing a state before the attachment device 23 of the circuit breaker in Embodiment 4 of the present invention is mounted, and FIG. 7 is an enlarged perspective view of a portion of the attachment device 23 in FIG.
[0014]
The auxiliary device 23 is provided with a projecting portion 23 a that is a locking member for locking the lead wire 22 drawn out of the circuit breaker 2 from the auxiliary device 23, and is pulled out from the auxiliary device 23. When the lead wire 22 is pulled out of the circuit breaker 2, if the lead wire 22 is wound around the projecting portion 23a, the lead wire 22 is fixed to the projecting portion 23a. No stress is applied to the lead wire connecting portion 23b of the attachment device 23 even when pulled in the direction of the mounting surface 2. In addition to this configuration, as shown in the third embodiment, if the lead wire loosening prevention rib 12b is provided inside the auxiliary cover 12, it is more firmly locked and fixed.
[0015]
【The invention's effect】
As described above, according to the present invention, the locking member capable of winding and locking the lead wire drawn out from the accessory device to the outside of the circuit breaker is provided on the side wall of the accessory device. Even when a crimp terminal is attached or when the lead wire is long, it is not configured to pass through the elongated hole, so that the lead wire can be easily locked and fixed.
[0016]
Further, the locking member is formed in an approximately L shape, and one end thereof is an opening for inserting a lead wire, and the other end is a locking portion for winding and locking the lead wire. It is easy to attach and restrain loosening of the lead wire.
[0017]
In addition, by providing a bend prevention protrusion that suppresses a bend of a predetermined size or more of the locking member at the opening portion of the locking member or a portion facing the opening portion inside the auxiliary cover, the locking member is broken. Can be prevented.
[0018]
Furthermore, by providing a loosening prevention rib inside the auxiliary cover, it is possible to prevent the locking of the lead wire locked to the locking member from being loosened when the lead wire is pushed inward from the outside. Can do.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state before an attachment device for a circuit breaker according to Embodiment 1 of the present invention is mounted.
FIG. 2 is an enlarged perspective view of the attachment device portion of FIG. 1;
FIG. 3 is a partially cutaway side view when the circuit breaker attachment device according to Embodiment 1 of the present invention is mounted.
4 is a partial plan view taken along line AA in FIG. 3;
5 is a partial cross-sectional view taken along line BB in FIG. 3. FIG.
6 is a perspective view showing a state before the attachment device 23 of the circuit breaker in Embodiment 4 is mounted. FIG.
7 is an enlarged perspective view of the attachment device of FIG. 6. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 2 Circuit breaker, 11 Circuit breaker case, 11a Base, 11b Main cover, 12 Auxiliary cover, 12a Side wall, 12b Slack prevention protrusion, 14 Recesses, 21, 23 Attached device, 21a, 23a Locking member, 21ac Deflection Prevention protrusion, 21c Lead wire connection part, 22 Lead wire.

Claims (2)

A circuit breaker case comprising a base and a main cover attached to the base and incorporating an overcurrent interrupting mechanism; a recess formed in the main cover for accommodating an accessory device of the overcurrent interrupting mechanism; and the main cover In the circuit breaker having an auxiliary cover that is attached to the recess and closes the recess, a lead wire drawn out from the accessory device to the outside of the circuit breaker can be wound and locked on the side wall of the accessory device. A substantially L-shaped locking member is provided, one end of which is used as an opening for inserting a lead wire, and the other end is used as a locking portion for winding and locking the lead wire. Alternatively, the circuit breaker is characterized in that a bend prevention protrusion for suppressing a bend of the locking member beyond a predetermined dimension is provided in a portion facing the opening inside the auxiliary cover . When the lead wire pulled out to the outside of the circuit breaker is pushed in from the outside to the inside direction, the auxiliary protrusion is provided with a slack prevention projection for preventing the lead wire locked by the locking member from loosening. The circuit breaker according to claim 1, wherein the circuit breaker is provided inside the cover .

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