JPH0217371Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an arc box for a magnetic contactor.

In recent years, there has been a strong demand for safety when using electromagnetic contactors, and safety covers are also installed on the arc boxes of electromagnetic contactors to prevent hands from touching the conductive parts of electromagnetic contactors during use. It became like that.

Figure 1 shows an example of a conventional electromagnetic contactor. In the figure, reference numeral 13 indicates a mounting base made of a metal steel plate, and the electromagnetic contactor main body is disposed on this mounting base 13. Ru. A base 2 is made of an insulating material and is fixed to the mounting base 13 with screws 14. Reference numeral 5 denotes a fixed core made of laminated silicon steel plates, and an electromagnetic coil 7 is attached to the fixed core 5. Reference numeral 6 denotes a movable iron core disposed facing the fixed iron core 5, and is configured to be attracted to the fixed iron core 5 when the electromagnetic coil 7 is energized. 4 is a crossbar made of insulating material,
It is connected to the movable iron core 6 via a pin 15, and a trip spring 8 is disposed between the crossbar 4 and the mounting base 13. The trip spring 8 always pushes up the crossbar 4 so that the main circuit of the electromagnetic contactor is opened. Reference numeral 1 denotes an arc box made of an insulating material, and a tightening screw hole 16 is formed in the arc box 1 for fixing it to the base 2 with a tightening screw 3.
A flat tightening portion 11 constituting a stepped portion is provided at the top of the screw hole.

However, when attaching the safety cover to the arc box 1, the tightening screw 3 that fixes the arc box 1 to the base 2 is shared, and a safety cover is installed between the tightening screw 3 and the flat tightening part 11 of the arc box 1. The cover fittings were inserted and fixed to the arc box 1 with tightening screws 3.

In such conventional arc boxes of electromagnetic contactors, when attaching the safety cover, since the tightening part 11 of the arc box 1 is only formed flat and there is no guide for the mounting metal of the safety cover,
If the tightening screw 3 is not loosened considerably, the safety cover mounting bracket cannot be inserted between the tightening part 11 and the tightening screw 3. Also, if the tightening screw 3 is loosened too much, the tightening screw 3 will be removed from the base 2. There was a risk that it would come off and cause one part of the arc box to fall and be damaged.

The present invention was made with the aim of eliminating the above-mentioned drawbacks of the arc box of the electromagnetic contactor, and its feature is that the arc box stacked on the base is In the arc box of the electromagnetic contactor, which is attached to the base by inserting a long tightening screw into the flat tightening part constituting the formed step, the tightening part is downwardly downward. By forming a sloped surface,
A wedge-shaped gap is interposed between the inclined surface and the seat plate of the tightening screw, and the bent lower side having a cut groove provided in the support leg of a mounting member such as a safety cover to be mounted on the arc box is When the tightening screw is loosened, the safety cover is configured so that it can be inserted into the lower surface of the seat plate through the wedge-shaped gap, so when inserting the safety cover into the arc box tightening part, the safety cover mounting bracket is tightened along the inclined surface. It fits under the washer of the set screw, pushes the washer up, and inserts it into the arc box tightening part.This reduces the possibility of loosening of the tightening screw, and makes it easy to remove the safety cover without removing the tightening screw. The present invention also provides an arc box for an electromagnetic contactor that can be reliably attached to the arc box.

Hereinafter, the present invention will be explained using Figs. 2, 3, and 4. The present invention has the characteristics in the arc box tightening part, and the other points are as follows.
This is similar to that shown in FIG. 1 above. That is, as shown in FIG. 2, the screw hole 1 of the tightening screw 3 is inserted into the flat arc box tightening part 11 for fixing the arc box 1 to the base with the tightening screw 3.
An inclined surface 12 that slopes outward and becomes lower is formed outward from 6, and a wedge-shaped gap as shown in the figure is interposed between it and the seat plate of the tightening screw 3.

Since the embodiment according to the present invention has the above configuration, in order to attach the safety cover 9 to the arc box 1, loosen the tightening screw 3 of the arc box 1 a little, and attach the tip of the mounting bracket 9a of the safety cover 9. When the notch groove part is inserted into the wedge-shaped gap along the tapered surface 12 of the arc box 1 (see Fig. 3), the mounting bracket 9a of the safety cover 9 pushes up the washer 3a, and the flat clamping part 11 of the arc box 1 is inserted. A gap is created between the surface of the washer 3a and the mounting bracket 9a fits therein. Then, when the tightening screw 3 is tightened, the mounting bracket 9a is fixed between the surface of the flat clamping part 11 of the arc box 1 and the washer 3a, and the installation of the mounting bracket 9a to the arc box 1 is completed ( (See Figure 4).

As mentioned above, according to the embodiment of the present invention, when attaching the safety cover to the arc box, there is no need to remove the tightening screw 3 of the arc box 1 from the arc box 1, and the amount to be loosened is small. Finally, the mounting bracket 9a of the safety cover 9 can be securely attached to the arc box 1 of the electromagnetic contactor.

In the above embodiment, a case has been described in which a safety cover is attached to the arc box of an electromagnetic contactor, but it is of course possible to attach optional parts other than the safety cover, and the same effects as described above can be obtained.

As described above, according to the arc box of the electromagnetic contactor according to the present invention, an inclined surface lowered toward the outside is formed in the flat tightening portion constituting the stepped portion of the arc box, and the inclined surface and the above-mentioned A wedge-shaped gap is interposed between the seat plate of the tightening screw, and the bent lower side having a cut groove provided on the support leg of a mounting member such as a safety cover installed on the arc box is used to loosen the tightening screw. Since the structure allows insertion into the lower surface of the seat plate through the wedge-shaped gap, there is no need to remove the arc box's tightening screw from the arc box when installing the safety cover, etc., and the amount of loosening is not small. This has the effect of easily and reliably attaching a safety cover to the arc box.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view of a conventional electromagnetic contactor, Fig. 2 is a partially sectional side view of an arc box according to an embodiment of the present invention, and Figs. FIG. 3 is a side sectional view showing how the safety cover is attached to the arc box according to the embodiment of the invention at different operating positions; 1...Arc box, 3...Tightening screw, 9...
... Safety cover, 11 ... Tightening part, 12 ... Inclined surface. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] The arc boxes stacked on the base are attached to the flat tightening part that constitutes the stepped part formed on the side of the arc box.
In the arc box of the electromagnetic contactor, which is attached to the base by inserting a long tightening screw, the tightening part is formed with an inclined surface that is lowered toward the outside, and the inclined surface and the above-mentioned A wedge-shaped gap is interposed between the seat plate of the tightening screw, and the bent lower side having a cut groove provided on the support leg of a mounting member such as a safety cover installed on the arc box is used to loosen the tightening screw. An arc box for an electromagnetic contactor, wherein the arc box is configured to be insertable into the lower surface of the seat plate through the wedge-shaped gap.