JP4743769B2 - Instantaneous device assembly structure - Google Patents

Description

  The present invention relates to an assembling structure of an instantaneous device used for an overcurrent tripping part of a circuit breaker for wiring or an earth leakage breaker.

  When a large current flows in the circuit breaker or the earth leakage circuit breaker, the movable iron piece of the instantaneous device trips and operates the device to interrupt the circuit. This instantaneous device generally has a structure in which a current flows between a U-shaped fixed yoke and a movable electromagnetic piece rotatably supported by the fixed yoke. When a large current flows, an electromagnetic force is generated. The movable electromagnetic piece is attracted to the fixed yoke, the trigger is pulled, the tripping device is operated, and the circuit is interrupted.

  Conventionally, as shown in Patent Document 1, the instantaneous device rotates and supports a fixed yoke and a movable electromagnetic piece with a pin, and urges the movable electromagnetic piece with a torsion spring. However, in this method, the number of parts is large, and it is necessary to assemble the pin by penetrating the winding part of the torsion spring while holding the torsion spring at the time of assembling.

  Therefore, there has been a demand for the development of an assembly structure of an instantaneous device that is easy to assemble and can reduce the number of parts and the manufacturing cost.

Japanese Patent Application No. 9-063452

  The present invention has been completed for the purpose of providing an assembly structure of an instantaneous device that solves the above-described problems, is easy to assemble, reduces the number of parts, and can reduce manufacturing costs. It is.

  The present invention, which has been made to solve the above problems, is an assembly structure of an instantaneous device in which a movable electromagnetic piece is rotatably supported by a fixed yoke. On one of them, a protrusion having a substantially oval cross-sectional shape, which serves as a shaft for rotation support, is formed at a position corresponding to the protrusion of the other member, and a circular portion having a diameter slightly larger than the long axis of the protrusion, An insertion portion having a width smaller than the major axis of the projection but larger than the minor axis of the projection is formed to form a notch serving as a bearing for the projection, and the movable electromagnetic piece is rotated after the projection is inserted into the notch. Accordingly, the protrusion is prevented from falling off from the cut portion, and the movable electromagnetic piece is rotationally supported by the fixed yoke.

  An elastic arm is extended on both sides or one side of either one of the fixed yoke and the movable electromagnetic piece, and a positioning projection is formed at a position corresponding to the elastic arm of the other member. When the piece is assembled to the fixed yoke, the elastic arm bends and climbs over the protrusion, and then the protrusion and the elastic arm regulate the rotation of the movable electromagnetic piece, and the movable electromagnetic piece rotates to the fixed yoke by a predetermined angle. A structure that can be supported is preferable.

  A protrusion with a substantially oval cross-section is formed on one of the inner side of both sides of the fixed yoke and the outer side of both sides of the movable electromagnetic piece, and corresponds to the protrusion of the other member. A notch which is a circular portion having a diameter slightly larger than the major axis of the projection and an insertion portion having a width smaller than the major axis of the projection but larger than the minor axis of the projection, and serving as a bearing for the projection. Since it is formed, a shaft for rotating and supporting the movable electromagnetic piece is unnecessary, and the cost can be reduced by reducing the number of parts.

  If an elastic arm is extended on both sides or one side of one member of the fixed yoke and the movable electromagnetic piece, and a positioning protrusion is formed at a position corresponding to the elastic arm of the other member, the movable electromagnetic Parts for positioning the pieces are no longer necessary, and the cost can be reduced by reducing the number of parts.

  Further, after the protrusion is inserted into the notch, the movable electromagnetic piece can be rotatably supported on the fixed yoke by a predetermined angle only by rotating the movable electromagnetic piece, and the assembly is completed. It becomes easy and the cost can be reduced.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of an instantaneous device showing an embodiment of the present invention. This instantaneous device has a structure in which a movable electromagnetic piece composed of a movable iron piece 1 and a movable iron piece support 2 is rotatably supported by a fixed yoke 3. As shown in FIG. 2, the movable electromagnetic piece has a structure in which a movable iron piece 1 made of a magnetic material is fitted and integrated with a movable iron piece support 2 made of brass, which is a non-magnetic material, and a fitting portion 4. is there. The material of the movable iron piece support material 2 is a non-magnetic material. When an overcurrent flows, the movable iron piece support material 2 is prevented from acting on the movable iron piece support material 2 to hinder the rotation of the movable electromagnetic piece. This is to prevent the efficiency that the air is sucked into the fixed yoke 3 from being lowered.

  As shown in FIG. 3, the fixed yoke 3 has a U-shape and is made of a magnetic material such as iron. On the inner side of both side surfaces of the fixed yoke 3, there are provided projections 6 that are projected by press molding. As shown in FIG. 4, the cross-sectional shape of the protrusion 6 has a substantially oval shape in which the top and bottom of a circle are cut out. Here, the longitudinal direction of the protrusion 6 is a major axis 7 and the width direction is a minor axis 8.

  On the other hand, as shown in FIG. 5, notches 5 are formed on both side surfaces of the movable iron piece support 2. The notch 5 is composed of a circular portion 9 having a diameter slightly larger than the major axis 7 of the projection 6 and an insertion portion 10 having a width smaller than the major axis 7 of the projection 6 but larger than the minor axis 8 of the projection 6. Yes.

  Next, a method for assembling the movable electromagnetic piece to the fixed yoke 3 will be described. The protrusion 6 is inserted into the notch 5 so that the longitudinal direction of the protrusion 6 is perpendicular to the width direction of the insertion portion 10 (state of FIG. 5). (State of FIG. 6) Thereafter, the movable electromagnetic piece is rotated. (State in FIG. 7) Since the width of the insertion portion 10 is shorter than the major axis 7 of the protrusion 6, the protrusion 6 does not fall off from the notch portion 5, and the movable electromagnetic piece is rotatably supported by the fixed yoke 3. Since the cross-sectional shape of the protrusion 6 is a shape obtained by cutting out the top and bottom of the circle, the movable electromagnetic piece can be smoothly rotated without making point contact when the movable electromagnetic piece is rotated.

  As shown in FIG. 2, the elastic arm 11 is extended on one side of the side surface of the movable iron piece support 2. On the other hand, as shown in FIG. 3, positioning protrusions 12 are formed at positions corresponding to the elastic arms 11 of the fixed yoke 3. The positioning projections 12 are formed by pressing the side surface of the fixed yoke 3 so as to protrude from the inner surface of the side surface of the fixed yoke 3 toward the back.

  After the protrusion 6 is inserted into the notch 5 (the state shown in FIG. 6), when the movable electromagnetic piece is rotated, the elastic arm 11 comes into contact with the positioning protrusion 12 and bends due to elasticity to get over the positioning protrusion 12 and the elastic arm 11 Will return to its original shape due to elasticity. (State of FIGS. 7 and 8) As described above, the positioning protrusion 12 has a shape that gradually increases from the inner surface of the side surface of the fixed yoke 3 toward the back. However, after assembling, the elastic arm 11 cannot get over the positioning projection 12, and the rotation of the movable electromagnetic piece is restricted, and the movable electromagnetic piece is supported by the fixed yoke so as to be rotatable by a predetermined angle. It becomes. The elastic arm 11 and the positioning projection 12 may be formed on both sides of the movable electromagnetic piece and the fixed yoke 3.

  As shown in FIG. 2, a spring protrusion 13 is formed below the notch 5 of the movable iron piece support 2. With the instantaneous device support member 51 (shown in FIG. 9), with the fixed yoke 3 and the spring 14 held, the protrusion 6 is inserted into the notch 5 as described above, and the movable electromagnetic piece is simply rotated. The spring protrusion 13 is fitted into the winding portion at the upper end of the spring 14, the assembly is completed, and the movable electromagnetic piece is biased in the opening direction.

  As described above, according to the present invention, the protrusion 6 and the positioning protrusion 12 serving as the rotation support shaft are formed on the fixed yoke, and the cut portion 5 and the elastic arm 11 are formed on the movable electromagnetic piece. Therefore, assembling is completed simply by rotating the movable electromagnetic piece, the assembling becomes easy, and the number of parts can be reduced. Therefore, it is possible to provide an instantaneous device assembly structure that can reduce the manufacturing cost. It has become possible.

  In the embodiment described above, the notch 5 and the elastic arm 11 are formed on the movable electromagnetic piece, and the protrusion 6 and the positioning protrusion 12 are formed on the fixed yoke 3. The elastic arm 11 may be formed on the fixed yoke 3, and the protrusion 6 and the positioning protrusion 12 may be formed on the movable electromagnetic piece.

  Although the present invention has been described above in connection with the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. The invention can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and the assembly structure of the instantaneous device with such a change is also included in the technical scope. Must be understood.

It is a perspective view of an instantaneous device showing an embodiment of the present invention. It is a perspective view of a movable electromagnetic piece. It is a perspective view of a fixed yoke. It is sectional drawing of the processus | protrusion provided in the fixed yoke. It is assembly explanatory drawing of a movable electromagnetic piece and a fixed yoke. It is assembly explanatory drawing of a movable electromagnetic piece and a fixed yoke. It is assembly explanatory drawing of a movable electromagnetic piece and a fixed yoke. It is a cross-sectional perspective view of the assembled state of a movable electromagnetic piece and a fixed yoke. It is a section perspective view of a circuit breaker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Movable iron piece 2 Movable iron piece support material 3 Fixed yoke 4 Fitting part 5 Notch part 6 Protrusion 7 Long axis 8 Short axis 9 Circle part 10 Insertion part 11 Elastic arm 12 Positioning protrusion 13 Spring protrusion 14 Spring 51 Instantaneous device support material

Claims (2)

  In the assembly structure of the instantaneous device in which the movable electromagnetic piece is rotationally supported by the fixed yoke, the cross-sectional shape that becomes the axis of rotation support on either the inner side of the fixed yoke or the outer side of the movable electromagnetic piece Forms a substantially oval-shaped projection, and has a circular portion with a diameter slightly larger than the major axis of the projection and a smaller minor axis of the projection at a position corresponding to the projection of the other member. An insertion portion having a width larger than the shaft is formed, a notch portion serving as a bearing for the protrusion is formed, and after the protrusion is inserted into the notch portion, the movable electromagnetic piece is rotated to remove the protrusion from the notch portion. An assembly structure of an instantaneous device, characterized in that the movable electromagnetic piece is rotatably supported by a fixed yoke.   An elastic arm is extended on both sides or one side of either one of the fixed yoke and the movable electromagnetic piece, and a positioning protrusion is formed at a position corresponding to the elastic arm of the other member. When assembling to the fixed yoke, after the elastic arm bends and gets over the protrusion, the protrusion and the elastic arm regulate the rotation of the movable electromagnetic piece so that the movable electromagnetic piece can rotate to the fixed yoke by a predetermined angle. The assembly structure of the instantaneous device according to claim 1, wherein the structure is supported.

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