JPH0234406B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric switchgear in which a case housing electrical components such as electromagnetic devices is made up of a box-shaped base with one side open and a cover facing each other at their outer wall end faces.

BACKGROUND ART Attempts have been made to make electric switchgears such as remote control relays smaller and lighter without reducing their performance. As a countermeasure for this, it is important to reduce the size and weight of electromagnetic devices and other electrical components, as well as to simplify the structure of their mounting parts.In particular, it is important to install electrical components without using screws or pins. Making it possible to do this not only contributes to making the device smaller and lighter, but also to simplifying the manufacturing process and ultimately reducing costs.

This invention has been made in view of the above circumstances, and includes an electromagnetic device arranged on a base, which is elastically sandwiched in the horizontal direction by a rigid wall on the base side and a plate-shaped post, By firmly holding the electromagnetic device in the vertical direction between the base and the protrusions provided on the cover side, the electromagnetic device can be fixed inside the hollow case consisting of the base and the cover without any wobbling. Therefore, it is an object of the present invention to provide a small and lightweight electric switchgear easily and inexpensively.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric switchgear according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway side sectional view of a case 1 in an electric switchgear. This electrical switchgear is of a remote control type for remote and centralized control of lighting equipment in buildings, schools, assembly halls, etc., and is a movable iron core 2a of a self-resetting electromagnetic device 2 (hereinafter referred to as electromagnetic device). Movable contact 3
An operating mechanism section 4 is interposed between the case 1 and the operating mechanism section 4, and the operating mechanism section 4 can be manually operated by swinging a handle 5 from the outside of the case 1. In addition, the main circuit terminals 6a and 6b are
It is provided in a recessed part 7 formed on the outside of the case 1. Note that the structure of the operating mechanism section 4 itself is not a subject of the present invention, so a detailed explanation thereof will be omitted.

As shown in FIG. 1, the electromagnetic device 2 includes a short annular yoke 2c surrounding the coil 2b, and a control circuit printed board 8 is arranged on the side of the electromagnetic device 2. On the other hand, electric components such as a fixed contact 9 and a lead metal fitting 10 are arranged in a portion facing the electromagnetic device 2 and the printed board 8 with the operating mechanism section 4 and the movable contact 3 interposed therebetween.

Next, as is clear from FIGS. 2 and 8, the case 1 consists of a box-shaped base 1 with one side open.
1 and a cover 12.

As shown in FIGS. 3 and 4, the base 11 has a wall portion 13 that forms an installation section for the electromagnetic device 2.
a, 13b are formed to face each other, and a protrusion 14a is formed at two intermediate portions of the inner wall portion 13a, and a protrusion 14a is integrally formed from the base 11 at the inner center portion of the outer wall portion 13b so as to face these protrusions 14a. A flat post 14b that is raised by forming is provided. Further, wall portions 15 protruding toward each other at one end of each of the wall portions 13a and 13b facing each other are provided.
a, 15a are formed, and these wall portions 15
Protrusions 16a, 16a are formed on a, 15a, respectively. And these protrusions 16a, 16
A flat post 16b is raised from the base 11 so as to be opposite to b. On the other hand, protrusions 17a and 17b are formed on two adjacent sides of the yoke 2c in the electromagnetic device 2 so as to correspond to the respective posts 14b and 16b. By fitting from the top, the front and inner surfaces of the yoke 2c are received by the protrusions 14a, 14a, 16a, 16a, respectively, while the protrusions 17a, 17b on the rear and outer surfaces are received by the protrusions 17a, 17b, respectively, as shown in FIG. Posts 14b, 16
b and elastically deforms it outward. Specifically, the electromagnetic device 2 is elastically held in the front-rear direction by the cooperation of the protrusions 16a, 16a and the post 16b, and in the left-right direction by the protrusions 14a, 14a and the post 14b. It is held elastically. Therefore, the electromagnetic device 2 can be installed without wobbling in the horizontal direction. Further, rising portions 18a, 18a protrude from the outer wall portion 13b on both sides of the post 14b.
The other end of the inner wall portion 13a has a rising wall portion 19a that is provided perpendicularly to the other end of the inner wall portion 13a, so that when the electromagnetic device 2 is displaced outward or backward due to some kind of impact, the posts 14b and 16b are excessively deformed and broken. It acts as a stopper to prevent this from happening. In addition, in the above, the inner wall part 13a and the wall part 1
5a and 15a have rigidity. 25 is electromagnetic device 2
This is the support part that supports the lower surface of the.

Next, the cover 12 shown in FIG. 6 and FIG. are integrally provided, and a housing compartment for the electromagnetic device 2 is formed between them. A pair of protrusions 21a and 21b each having a tip end edge shape are formed in the cover 12 in this storage compartment in a raised shape.

As is clear from FIG. 8a, the edge-shaped protrusions 21a and 21b correspond to the upper surface of the yoke 2c in the electromagnetic device 2, and are located on the base 1.
When the outer wall end surface 11a of the cover 12 and the outer wall end surface 12a of the cover 12 are butted against each other, the tip edge portions 22 of the tip edge-shaped projections 21a and 21b
a, 22b are pressed against the yoke 2c and are crushed as shown in FIG. 8b. In this state, the electromagnetic device 2 is firmly held between the base 11 and the edge-like projections 21a and 21b of the cover 12 in the vertical direction. In this case, it is preferable that the tip edge-like protrusions 21a and 21b are integrally molded with the cover 12 from thermoplastic resin in order to effectively exhibit their functions.

Next, as shown in FIG. 9a, the base 1
A concave groove 23 is formed along the inner peripheral edge of the outer wall end surface 11a of the cover 1.
A tapered protrusion 24 that is fitted into the groove 23 is formed on the outer wall end surface 12a of the outer wall 2 . This protrusion 24 is fitted into the groove 23 when the cover 12 is butted against the base 11, and is pressurized while applying ultrasonic vibration in this state, so that the protrusion 24 is formed as shown in FIG. 9b. Projection 24 and concave groove 2
3 are fused and joined, thereby forming the concave groove portion 23.
disappears, and the stepped portion 24a of the outer wall end surface 12a on the cover 12 side becomes the outer wall end surface 1 of the base 11.
It is joined to the outer edge of 1a and becomes flush. In this case, the groove 23 may be formed on the cover 12 side, and the protrusion 24 may be formed on the base 11 side.
Even if it is formed in an annular shape over the entire surface of a, 12a,
It may be formed partially with the required pitch.

According to the electric switchgear as described above, the electromagnetic device 2 built into the hollow case 1 is firmly attached without rattling in the horizontal direction and the vertical direction, as described above, and the posts 14b, 16
b is backed up at the rising portion 18a and the rising wall portion 19a, so that it will not break.

As is clear from the above description, according to the present invention, the electromagnetic device can be easily installed without using screws, etc., so the manufacturing process can be simplified and costs can be reduced. is achieved. Further, various protrusions, posts, or rigid walls are integrally molded with the base and cover, and inexpensive thermoplastic resin can be used as the material, so costs can be reduced from this point as well. Furthermore, despite the above-mentioned simple configuration, the electromagnetic device can be mounted reliably without rattling, so that an electric switchgear that is small in size yet operates reliably can be obtained.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view of an electrical switchgear according to an embodiment of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a plan view of the base, FIG. 4 is a side view of the same, and FIG.
The figure is a cross-sectional view of the post, and Figure 6 is a plan view of the cover.
Fig. 7 is a side view of the same, Fig. 8a is a longitudinal side view showing the combination of the tip edge-like projection and the electromagnetic device, Fig. 8b is an enlarged sectional view of the main part of Fig. 9a, Fig. 9a 9 is a partial cross-sectional view showing the state where the base and the cover are butted together, and FIG. 9b is a partial cross-sectional view showing the state after welding and joining. 1... Case, 2... Self-resetting electromagnetic device, 2
c...Yoke, 11...Base, 11a...Outer wall end face of the base, 12...Cover, 12a...Outer wall end face of the cover, 13a...Inner wall portion, 14a,
16a...Protrusion, 14b, 16b...Post, 1
8a...Rising portion, 19a...Rising wall portion, 21
a, 21b... Tip edge-like projection, 22a, 22
b...Distal edge portion of distal edge-like projection, 25...
...Support part. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An electric switchgear in which an electromagnetic device, an operating mechanism, etc. are housed in a box-shaped base with one side open, and a cover is butted against the base and welded together, and the base is molded integrally with the base. A support part that supports the lower surface of the housed electromagnetic device, a wall part provided to support the electromagnetic device while maintaining a predetermined gap around the electromagnetic device, and two opposing sides of the electromagnetic device are each elastically applied. and at least two posts that are pressed and fixed to the wall, and the cover is formed at a position where it comes into contact with the top surface of the electromagnetic device, and when the cover is welded together with the base, the tips of the posts are pressed and accommodated. An electric switchgear comprising an edge-shaped protrusion for fixing an electromagnetic device.