JP6290696B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker, and more particularly to a connecting structure of an auxiliary cover that covers a storage portion of an accessory device.

  The circuit breaker has a fixed contact and a movable contact of the main circuit, an arc extinguishing device, an open / close mechanism for the movable contact, an overcurrent trip mechanism and a built-in auxiliary device in a base and a main cover covering the base. Examples of the auxiliary device include an auxiliary switch that electrically outputs an open circuit and a closed circuit according to an opening / closing operation of a main circuit contact, and an alarm switch that electrically outputs a trip operation when the circuit is interrupted. This accessory device can be freely attached on the user side. The main cover is formed with a recess for accommodating the accessory device, and an auxiliary cover is mounted to cover the recess.

  As a related art in this field, there is JP-A-6-124638 (Patent Document 1). Patent Document 1 discloses a structure in which an auxiliary cover is attached to a main cover by a hinge part so as to be opened and closed. Moreover, there exists Unexamined-Japanese-Patent No. 2009-4166 (patent document 2). In Patent Document 2, an auxiliary cover is connected to a main cover via a hinge portion, and the hinge portion is composed of a connecting shaft provided on the main cover and a pair of holding protrusions that sandwich the connecting shaft provided on the auxiliary cover. A structure is disclosed.

JP-A-6-124638 JP 2009-4166

  In Patent Document 1, as a hinge part, a pin hole type holding part is provided in the main cover, and the pin of the auxiliary cover is connected. Therefore, it is necessary to provide the auxiliary cover with a notch that accommodates the pin hole type holding part of the main cover, the gap of the notch part of the auxiliary cover becomes large, and the conductive parts inside the circuit breaker are exposed or interrupted There is a possibility of blowing out the melt. Further, when the auxiliary cover is attached to the main cover, it is necessary to fit the pin into the pin hole, so that the auxiliary cover may be damaged. Similarly, in Patent Document 2, there is a large gap between the connecting portion formed by the connecting shaft and the pinching protrusion, and there is a possibility that the conductive parts inside the circuit breaker are exposed or the molten material is blown out at the time of interruption.

  It is an object of the present invention to provide a circuit breaker having an auxiliary cover connecting structure in which the gap between the connecting portions is reduced and the possibility that the auxiliary cover is damaged is reduced.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present invention includes a plurality of means for solving the above problems. For example, an open / close shut-off mechanism is built in the base and the main cover that covers the base. A circuit breaker in which an auxiliary cover that covers the recess is attached to the main cover so as to be openable and closable via a connecting portion, and the connecting portion protrudes from a side surface of a protrusion provided on an edge of the auxiliary cover. And a pinching protrusion for holding the connecting shaft provided on the main cover, the connecting shaft having a cylindrical end with a predetermined shaft diameter, and the pinching protrusion being capable of inserting the connecting shaft. The groove has a structure in which the width of the groove is smaller than the shaft diameter of the connecting shaft and larger than the length from the notch portion of the connecting shaft to the opposite ends in the radial direction.

  ADVANTAGE OF THE INVENTION According to this invention, the circuit breaker which has the auxiliary | assistant cover connection structure which made the clearance gap of a connection part small and improved the assembly property can be provided.

It is an external view of the circuit breaker of a present Example. It is sectional drawing of the connection part of a present Example. It is a detailed block diagram of the auxiliary cover of a present Example. It is a detailed block diagram of the main cover of a present Example. It is sectional drawing of the connection part for demonstrating the operation | movement at the time of attaching the auxiliary | assistant cover of a present Example to a main cover. It is axial sectional drawing which shows the modification of the connection shaft of a present Example.

Embodiments of the present invention will be described below with reference to the drawings.
1A and 1B are external views of a circuit breaker according to the present embodiment. FIG. 1A is a perspective view showing the external appearance, and FIG. 1B is a longitudinal sectional perspective view of FIG. In FIG. 1, 1 is a base made of mold resin, and 2 is a main cover that covers the base 1. In the base 1 and the main cover 2, a stationary contact and a movable contact, an arc extinguishing device, a movable contact switching mechanism, an overcurrent trip mechanism and the like are incorporated. Further, the main cover 2 is provided with a recess for attaching an accessory device. Reference numeral 3 denotes an auxiliary cover that covers the concave portion for attaching the accessory device, and is attached to the main cover 2 by a connecting portion indicated by 4 so as to be opened and closed.

  2A and 2B are cross-sectional views of the connecting portion 4, wherein FIG. 2A is a cross-sectional perspective view, and FIG. 2B is a cross-sectional side view. In FIG. 2, the auxiliary cover 3 has a protrusion 5 at its end edge, and is provided with a connecting shaft 6 protruding from the side surface. The main cover 2 is provided with a clamping protrusion 7 that clamps the connecting shaft 6. The main cover 2 has a notch 8 that accommodates the protrusion 5 of the auxiliary cover 3, and the notch 8 is formed deeper than the main plane 9 of the main cover 2. The center of rotation is a position lower than the position obtained by adding the shaft diameter of the connecting shaft to the main plane of the main cover.

  FIG. 3 is a detailed configuration diagram of the auxiliary cover 3, (A) is a perspective view, (B) is a front view, (C) is a side view, and (D) is a rear view. As shown in FIG. 3, a connecting shaft 6 protruding from the side surface of the protrusion 5 is disposed. In this embodiment, two protrusions 5 are provided, one of which has two connecting shafts on both side surfaces, and the other protrusion has one connecting shaft from one side surface. The present embodiment is not limited to this. For example, one protrusion may be used as two connecting shafts provided on both side surfaces, or four connecting shafts may be provided for two protrusions. Also good.

  FIG. 4 is a detailed configuration diagram of the main cover 2, (A) is a perspective view, (B) is a front view, (C) is a side view, and (D) is a rear view. As shown in FIG. 4, it has the pinching protrusion 7 and the notch part 8, and the pinching protrusion 7 is three and the notch part 8 is two corresponding to the auxiliary | assistant cover 3 of FIG. In addition, a present Example is not limited to this, For example, it is good also as two clamping protrusions and one notch part, and good also as four clamping protrusions and two notch parts.

  FIG. 5 shows a cross-sectional view of the connecting portion 4 for explaining the operation when the auxiliary cover 3 is attached to the main cover 2. In FIG. 5, (A) shows a state in the middle of the attaching operation, and (B) shows a state after the attachment is completed. In FIG. 5A, the sandwiching protrusion 7 has an opening, and forms a groove formed between the end of the opening and the opposing surface of the main cover. The connecting shaft 6 has a shape in which one end of a cylindrical shape having a predetermined shaft diameter is cut out. The width (interval) 10 of the groove of the pinching protrusion 7 is configured to be smaller than the shaft diameter of the connecting shaft and larger than the length from the notch portion of the connecting shaft to the opposite ends in the radial direction. . Therefore, the connecting shaft can be inserted into the groove only in a predetermined direction of the connecting shaft through which the minimum diameter after the notch of the connecting shaft passes through the groove. Therefore, since the groove width of the pinching protrusion 7 can be made smaller than the shaft diameter of the connecting shaft, the gap between the connecting portions can be reduced.

  Further, as described above, the main cover 2 has the notch portion 8 that accommodates the protrusion 5 of the auxiliary cover 3, and the notch portion 8 is formed to be deeper than the main plane 9 of the main cover 2. Therefore, after inserting the connecting shaft into the groove obliquely downward as shown by the arrow (A), the connecting shaft 6 is fitted into the concave portion of the holding projection 7 by laying the auxiliary cover 3 as shown in (B). It can be prevented from coming off. Moreover, since the position of the opening part which is the groove | channel of the clamping protrusion 7 can be made into a low position, the clearance gap of a connection part can be made small.

  Furthermore, since the rotation center of the connecting shaft 6 is lower than the position obtained by adding the shaft diameter of the connecting shaft to the main plane of the main cover, it prevents the connecting portion from protruding and the outer diameter of the circuit breaker from increasing. I can do it.

  FIG. 6 is an axial sectional view showing a modified example of the connecting shaft 6. (A) has shown the notch shape demonstrated above. In (A), with respect to the shaft diameter a of the connecting shaft 4, the length b from the notch portion to the radially opposing end is short, and as described above, the groove 10 of the clamping protrusion 7 has the shaft diameter. It is set smaller than a and longer than b. In the present embodiment, it is only necessary to be able to be inserted into the groove 10 of the holding projection 7 in a groove smaller than the shaft diameter of the connecting shaft only in a predetermined direction of the connecting shaft. It is not limited to. For example, a shape with a recess shown in (B), a shape with a cut into the center position of (C), or a shape with a U-shaped cut in (D) with respect to the shaft diameter. Or the structure where the length b from a notch part to the edge part to which a radial direction opposes may be short. In the examples (A) to (D), the corners may have an R shape. In the examples of (B) to (D), the auxiliary cover 3 can be attached to the main cover 2 by inserting the connecting shaft 6 so as to go around the groove 10 of the pinching protrusion 7.

  In the present embodiment, it has been described that the notch 8 is formed by digging down from the main plane 9 of the main cover 2, but it is not necessary to dig up, and the width of the groove of the clamping protrusion is smaller than the shaft diameter of the connecting shaft. Since it can do, there exists an effect that the clearance gap of a connection part can be made small.

As described above, this embodiment incorporates an opening / closing shut-off mechanism in the base and the main cover that covers the base, and the auxiliary cover that covers the concave portion for attaching the accessory device provided on the main cover is connected to the main cover via the connecting portion. The circuit breaker is attached so as to be openable and closable, and the connecting portion sandwiches the connecting shaft provided on the side surface of the protrusion provided on the edge of the auxiliary cover and the connecting shaft provided on the main cover. Consisting of pinching protrusions,
The connecting shaft has a cylindrical shape with a predetermined shaft diameter cut out at one end, and the clamping protrusion has a groove into which the connecting shaft can be inserted, and the width of the groove is the axis of the connecting shaft. The structure is smaller than the diameter and larger than the length from the notch portion of the connecting shaft to the opposite ends in the radial direction.

  Thereby, the clearance of a connection part can be made small, and the circuit breaker which has the auxiliary | assistant cover connection structure with high safety | security and the improved assembly property can be provided.

  Although the embodiments have been described above, the present invention is not limited to the above-described embodiments, and includes various modifications. That is, the shape and arrangement of the component parts are not limited to the present embodiment, and may be appropriately changed within the spirit of the present invention.

1: base, 2: main cover, 3: auxiliary cover, 4: connecting part,
5: Auxiliary cover projection, 6: Auxiliary cover connecting shaft, 7: Main cover clamping projection,
8: Notch portion of main cover, 9: Main plane of main cover, 10: Groove of clamping protrusion

Claims (3)

A circuit breaker with a built-in opening / closing shut-off mechanism in the base and the main cover that covers it, and an auxiliary cover that covers the recess for attaching the accessory device provided on the main cover. There,
The connecting portion includes a connecting shaft protruding from a side surface of a protrusion provided on an edge of the auxiliary cover, and a holding protrusion for holding the connecting shaft provided on the main cover.
The connecting shaft has a shape in which one end of a cylindrical shape having a predetermined shaft diameter is cut out,
The clamping protrusion has a groove into which the connecting shaft can be inserted, and the width of the groove is smaller than the shaft diameter of the connecting shaft, and is a length from a notch portion of the connecting shaft to a radially opposing end. much larger than the of,
The main cover has a cutout portion that accommodates the protrusion of the auxiliary cover, the cutout portion is formed deeper than the main plane of the main cover, and the rotation center of the connecting shaft is the main cover. A circuit breaker having a lower position than a position obtained by adding the shaft diameter of the connecting shaft to the main plane . The circuit breaker according to claim 1, wherein
The circuit breaker according to claim 1, wherein the auxiliary cover has two protrusions, and the main cover has three clamping protrusions . The circuit breaker according to claim 1 or 2 ,
The connecting shaft has a shape in which a recess or cut is provided in a part of a cylindrical shape having a predetermined diameter, and the width of the groove of the holding protrusion is smaller than the shaft diameter of the connecting shaft, and the recess or notch of the connecting shaft is formed. A circuit breaker characterized in that it is longer than the length from the provided portion to the opposite end in the radial direction .

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