JPH06139902A - Circuit breaker - Google Patents

Abstract

PURPOSE:To extend a lead of an attachment easily without requiring the any additional part, and achieve a low cost by providing a thin part in the vicinity of a protruded root part of a protruding cover part, and opening the protruding cover part outward by the thin part. CONSTITUTION:A breaker case 1A comprises a base 1a, and a main cover 1b freely detachably fixed to the base 1a, and it includes a circuit breaker mechanism. An aperture part 10 is formed in the cover 1b in such a way as to extend a lead 7 of an attachment to a side part, and a protruding cover part 11 is integrally moulded of resilient material with an auxiliary cover 9 to close the part 10. A thin part 12 is formed at a root part of the part 11, so the part 11 is opened out. Where the attachment is not in the case 1A, the part 11 closes the part 10, and where the attachment is contained in it, it is pushed by the lead 7 to bend the part 11 out at a part 12, so the lead 7 can be extended from the part 10. A low-cost structure in which the lead 7 of the attachment can be extended easily without requiring any additional part can thus be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly to a lead wire for an auxiliary device provided inside the circuit breaker.

[0002]

2. Description of the Related Art FIGS.
FIG. 15 is a view showing a conventional circuit breaker disclosed in Japanese Patent No. 80436, FIG. 15 is an external perspective view with a part broken, FIG. 16 is a plan view of a main part with a part broken, and FIG. 17 is a perspective view showing an opening of a base. FIG. 18 is a perspective view showing a side plate.

In the figure, reference numeral 1 is a base made of a molded insulating material, and has an opening 2 in a side wall. A concave groove 2a is provided around the opening 2, and by inserting the convex portion 3a of the closing side plate 3 into this groove, the opening 2 is closed by the side plate 3 made of the molding insulating material. Is assembled by pressing the upper surface of the side plate 3 with the cover 4. Reference numeral 5 is an operating handle. The circuit breaker includes an alarm switch that switches when the circuit breaker trips, an auxiliary switch that switches when the circuit breaker disconnects, a voltage trip device that trips the circuit breaker by applying an external voltage,
An undervoltage trip device is installed that trips the circuit breaker when the circuit voltage drops. These accessory devices 6 are fixed to the base 1 as shown in FIG.
Moreover, the lead wire 7 is led out from the notch 3b of the side plate 3.

[0004]

In the conventional circuit breaker, the base 1 is used when the accessory circuit is modified as described above.
Since the side plate 3 having the notch 3b is detachably attached to the opening 2 and is drawn out through the lead wire 7 of the accessory device 6 to the notch 3b, the side plate 3 as a separate body is required and the number of parts is increased. However, there is a problem that the cost increases due to the number of processing steps.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain an inexpensive circuit breaker which can easily lead out the lead wire of an accessory device without requiring a separate component.

[0006]

A circuit breaker according to the present invention comprises a base and a cover fixed to the base and a breaker case having a built-in breaking mechanism, and is mounted on the cover side of the base. An accessory device of the blocking mechanism,
An opening formed by cutting from the cover side edge of the base for laterally pulling out the lead wire of the accessory;
A protruding cover portion protruding from the edge of the cover on the base side to close the opening, and a thin wall portion is provided in the vicinity of a protruding root of the protruding cover portion, and the thin cover portion opens the protruding cover portion to the outside. The lead wire can be drawn out.

[0007]

According to the present invention, the opening is normally closed by the projecting cover, and when the lead wire is pulled out from the opening, the projecting cover is opened outward by the thin portion so that the lead wire can be pulled out from the opening. To do.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described with reference to FIGS. 1 is an external perspective view, FIG. 2 is a view with an auxiliary cover and an accessory device removed from FIG. 1, FIG. 3 is a sectional view taken along line III-III in FIG. 1, and FIG. 4 is a view with the accessory device removed from FIG. Therefore, the same or corresponding parts as those of the above-mentioned conventional one are designated by the same reference numerals and the description thereof will be omitted. In the figure, 1A is a circuit breaker case including a base 1a and a main cover 1b removably fixed to the base 1a and having a built-in breaking mechanism, and 8 is a surface 101 of the main cover 1b opposite to the base 1a. A recess formed to accommodate the accessory device 6, and 9 is an auxiliary cover made of an elastic material that closes the recess 8 and is detachably attached to the main cover 1b. Reference numeral 10 is an opening formed in the main cover 1b for laterally pulling out the lead wire 7 of the accessory device 6, and 11 is a projecting cover portion for closing the opening 10.
Is integrally molded with an elastic material. Reference numeral 12 denotes a thin portion formed at the base of the protruding cover portion 11 so that the protruding cover portion 11 can be opened outward.

In the state where the auxiliary device 6 is not present in the recess 8, FIG.
As shown in, the protruding cover portion 11 closes the opening 10. When the auxiliary device 6 is housed in the recess 8,
As shown in FIGS. 1 and 3, the projecting cover portion 11 is pushed outward by the lead wire 7 and bends outward from the thin portion 12, so that the lead wire 7 can be pulled out from the opening 10.

Embodiment 2. As shown in FIGS. 5 and 6, a chamfer 13 is formed in the opening 10 of the base 1a, and a chamfer 14 is also formed in a portion of the protruding cover portion 11 corresponding to the chamfer 13, and the base 1a is formed. On the other hand, if the protruding cover portion 11 is extended downward so that the tip of the protruding cover portion 11 overlaps, it becomes difficult for dust to enter through the gap formed by the lead wire 7.

Embodiment 3. As shown in FIGS. 7 and 8, when the recess 15 is formed in the opening 10 of the base 1a,
As in the second embodiment, dust is less likely to enter through the gap, and the lead wire 7 can be clamped at two points at both corners of the recess 15, so that the lead wire 7 can be firmly fixed.

Embodiment 4. Next, another embodiment of the present invention will be described with reference to FIGS. 9 is an external perspective view, FIG. 10 is a view in which the auxiliary cover and the auxiliary device are removed from FIG. 9, FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 9, and FIG. 12 is line XI in FIG.
It is a cross-sectional view of I-XII, and the same or corresponding parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the figure, reference numeral 16 is an engagement bulge portion projecting on both inner sides of the projecting cover portion 11, which is locked to the inner edge of the opening 10 to prevent the projecting cover portion 11 from bending outward. 17 is the opening 10
Engagement protrusions provided on both inner sides of the lower edge prevent inward bending of the protruding cover portion 11.

When both the engaging protrusions 16 and 17 are provided in this manner, the lead wire 7 is pulled out by the bending of the tip of the protruding cover portion 11 as shown in FIGS. 9 and 11. When the lead wire 7 is further pulled at that time, the engagement bulge portions 16 are locked to both sides of the opening portion 11 as shown in FIG. 12, and the outward bending of the protruding cover portion 11 is prevented, On the contrary, when the lead wire 7 is pushed in, the protruding cover portion 1
The front end of 1 is locked to the engaging protrusion 17 and the protruding cover 11
Bending of the inside is prevented.

Example 5. In the first embodiment, when the bottom wall end 8a of the recess 8 of the main cover 1b is extended to the opening 10 as shown in FIG. 13, the lead wire 7 is provided as shown in FIG.
Since the bottom wall end 8a, the base 1a, and the protruding cover portion 11 are pulled out in a state of being bent at a right angle, the lead wire 7 is firmly fixed.

[0015]

As described above, according to the present invention, there is an effect that an inexpensive one can be obtained in which a lead wire of an accessory device can be easily drawn out without requiring a separate component.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of FIG.

3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a diagram in which an auxiliary device is removed from FIG.

FIG. 5 is the same view as FIG. 4 showing a second embodiment of the present invention.

FIG. 6 is a view in which an accessory device is attached to FIG.

FIG. 7 is the same view as FIG. 5 showing a third embodiment of the present invention.

FIG. 8 is a diagram in which an accessory device is attached to FIG. 7.

FIG. 9 is an external perspective view showing Embodiment 4 of the present invention.

FIG. 10 is an exploded perspective view of FIG.

11 is a cross-sectional view taken along the line XI-XI of FIG.

12 is a cross-sectional view taken along the line XII-XII in FIG.

FIG. 13 is an exploded perspective view showing a fifth embodiment of the present invention.

FIG. 14 is a cross-sectional view of a main part.

FIG. 15 is a partially cutaway external perspective view showing a conventional device.

FIG. 16 is a partially cutaway plan view of an essential part.

FIG. 17 is a perspective view showing an opening of the base.

FIG. 18 is a perspective view showing a side plate.

[Explanation of symbols]

 1A Circuit breaker case 1a Base 1b Main cover 6 Auxiliary device 7 Lead wire 8 Recess 9 Recess 9 Auxiliary cover 10 Opening 11 Protruding cover 12 Thin section

Front page continued (72) Inventor Hiroshi Fujii 1-8 Midoricho, Fukuyama City Mitsubishi Electric Co., Ltd. Fukuyama Factory (72) Inventor Shinji Yamaguchi 1-8 Midoricho, Fukuyama City Fukuyama Factory (72) ) Inventor Toshiyuki Tanibe 1-8 Midoricho, Fukuyama City Mitsubishi Electric Corporation Fukuyama Factory (72) Inventor Shinsaku Yamasaki 1-8 Midoricho, Fukuyama City Mitsubishi Electric Corporation Fukuyama Factory (72) Inventor Iio Tsukasa Fukuyama City No. 1-8 Fukuyama Factory, Mitsubishi Electric Co., Ltd. (72) Inventor Setsuo Hosogai No. 8 Midoricho, Fukuyama City Mitsubishi Electric Co., Ltd. (72) Kohei Fujiwara 1 Midoricho, Fukuyama City No. 8 Mitsubishi Electric Corporation Fukuyama Works

Claims (3)

[Claims] 1. A circuit breaker comprising a circuit breaker case comprising a base and a cover fixed to the base and having a built-in breaking mechanism, and an auxiliary device for the breaking mechanism mounted on the cover side of the base. An opening formed by cutting from the cover-side edge of the base for laterally pulling out the lead wire of the accessory, and a protrusion protruding from the base-side edge of the cover to close the opening. A circuit breaker comprising a cover portion, wherein a thin portion is provided in the vicinity of a protruding root of the protruding cover portion, and the thin cover portion opens the protruding cover portion to the outside so that the lead wire can be pulled out. 2. A circuit breaker comprising a circuit breaker case including a base and a cover fixed to the base and having a built-in breaking mechanism, and an auxiliary device of the breaking mechanism mounted on the cover side of the base. An opening formed by cutting from the cover-side edge of the base for laterally pulling out the lead wire of the accessory, and a protrusion protruding from the base-side edge of the cover to close the opening. A cover portion is provided, and engaging pieces are projected on both sides of the projecting cover portion where the tip portion of the projecting cover portion is left. A circuit breaker characterized in that the lead wire can be pulled out by bending outward. 3. A circuit breaker case including a base and a main cover fixed to the base and having a built-in breaking mechanism,
A circuit breaker having a recess formed on a surface of the main cover opposite to the base and accommodating an accessory device of the cutoff mechanism, and an auxiliary cover attached to the main cover to close the recess. In the above-mentioned, the main cover is provided with an opening that opens the side wall of the recess over the entire height of the main cover, and a projecting cover part that is projected from an end edge of the auxiliary cover on the main cover side to close the opening. Between a part of the main cover contact surface of the base exposed by the opening of the base and a bottom edge of the recess formed in a slope shape with respect to the part of the base and the tip of the protruding cover part. A circuit breaker characterized by being drawn out through a lead wire of the accessory device.