JP3829360B2 - Electromagnetic relay - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic relay, and more particularly to a fitting structure between a base and a case.
[0002]
[Prior art]
Conventionally, as an electromagnetic relay, for example, as shown in FIGS. 9 to 12, there is one in which a case 2 is fitted to a base 1 assembled with internal components. The base 1 presses the movable contact piece 5 and the terminal portions 5a and 6a of the fixed contact piece 6 into the press-fitting grooves 3 and 4 formed on the side end surfaces thereof, respectively, and then sequentially inserts the electromagnet block 7, the movable iron piece (not shown) and the card Assembled, and then the case 8 is fitted.
For convenience of explanation, the terminal portions 5a and 6a of the movable contact piece 5 and the fixed contact piece 6 in FIG. 12 and the case 8 are hatched.
[0003]
[Problems to be solved by the invention]
However, the base 1 is formed with tapered surfaces 3a and 4a at the opening edge located on the side surface of the opening edges of the press-fitting grooves 3 and 4. For this reason, even if the case 8 is fitted to the base 1 and sealed, the substantially triangular gaps 9 and 9 remain at the bottom edge of the base 1 and foreign substances such as ants may enter from the gap 9. It was.
[0004]
Even if a sealing agent (not shown) is injected into the bottom surface of the base 1 and solidified and sealed in order to solve the above-mentioned problems, a large amount of sealing agent tends to enter the gap 9 from the inside. For this reason, there is a problem that not only does the sealant adhere to the internal movable parts and causes malfunction, but a large amount of sealant is required and the manufacturing cost is high.
[0005]
In view of the above problems, an object of the present invention is to provide an electromagnetic relay capable of preventing the entry of foreign substances such as ants and unnecessary entry of a sealing agent and reducing the manufacturing cost.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the electromagnetic relay according to the present invention forms a tapered surface at the opening edge of the terminal press-fitting groove provided on the side surface of the base, and press-fits the terminal from the side through the tapered surface. In the electromagnetic relay in which the case is fitted to the base, the outer end surface of the terminal press-fitted into the press-fitting groove of the base is disposed at the bottom of the tapered surface, while the outer end surface of the terminal and the outer surface of the terminal are arranged on the inner side surface of the case. A projecting portion to be joined to the tapered surface is provided so that the case is fitted to the base from above.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment according to the present invention will be described with reference to the accompanying drawings of FIGS.
The electromagnetic relay according to the first embodiment has a case 20 fitted to a base 10 as shown in FIGS.
[0008]
The base 10 is configured to press-fit the terminal portions 13a and 14a of the movable contact piece 13 and the fixed contact piece 14 into press-fit grooves 11 and 12 formed on the side surfaces thereof, and then move the movable iron piece (not shown) via a hinge spring 15. Then, an electromagnet block 16 that is rotatably supported is assembled, and then a card 17 is inserted from the side between the electromagnet block 16 and the movable contact piece 13 and is rotatably supported.
[0009]
The press-fitting groove 11 bent in a crank shape is formed with tapered surfaces 11a and 11b at the opening edge thereof in order to facilitate the insertion of the terminal portion 13a of the movable contact piece 13. The press-fitting groove 12 is also formed with tapered surfaces 12a and 12b at the opening edge. Further, a guide groove 18 that communicates only with the opening edge of the press-fit groove 11 and has tapered surfaces 18 a and 18 b is formed on the side surface of the base 10.
[0010]
Then, by inserting the terminal portions 13a and 14a into the press-fitting grooves 11 and 12, respectively, the outer end surfaces of the terminal portions 13a and 14a are located at the bottoms of the tapered surfaces 11a, 11b and 12a, 12b, respectively, and are substantially trapezoidal in cross section. Straight shallow grooves 19a and 19b are formed.
[0011]
On the other hand, the case 20 has a pair of protrusions 21 and 22 that are fitted in shallow grooves 19a and 19b formed in the base 10 on the inner surface thereof.
[0012]
Therefore, the protrusions 21 and 22 of the case 20 are slide-fitted into the shallow grooves 19a and 19b of the base 10 to which the internal components such as the electromagnet block 16 are assembled. Thereby, as shown in FIG. 4, the protrusion 21 joins the outer end surface of the terminal portion 13a and the tapered surfaces 11a and 11b. Further, the protrusion 22 is joined to the outer end surface of the terminal portion 14a and the tapered surfaces 12a and 12b. For this reason, a gap as in the conventional example does not occur at the bottom edge of the base 10. As a result, there is an advantage that unnecessary entry of foreign substances such as ants and sealant can be prevented.
For convenience of explanation, the movable contact piece 13, the terminal portions 13 a and 14 a of the fixed contact piece 14, and the case 20 in FIG. 4 are hatched.
The shallow grooves 19a and 19b are not necessarily protrusions, but may be simple protrusions.
[0013]
In the second embodiment, as shown in FIGS. 5 to 8, the first embodiment described above is a case in which the generation of a gap is prevented by the ridges 21 and 22 arranged side by side on the inner surface of the case 20. In this case, no protrusion is provided on the inner side surface of the case 20 and the generation of a gap is prevented on the flat inner side surface.
That is, taper surfaces 11a and 11b are formed on the opening edge portion of the press-fitting groove 11 on the side surface of the base 10, and the tapered surfaces 11a and 11b are formed on the front and back surfaces of the terminal portion 13a. This is a case where partition portions 11c and 11d that are in pressure contact are provided. Similarly, partition portions 12c and 12d are provided on the tapered surfaces 12a and 12b of the press-fitting groove 12 so as to be in pressure contact with the front and back surfaces of the terminal portion 14a. In addition, the partition part 11e provided in the opening edge part of the press-fit groove | channel 11 also fulfill | performs the function as a reference surface of the terminal part 13a.
For convenience of explanation, the tapered surfaces 11a, 11b, 12a and 12b in FIG. 8 are hatched.
[0014]
Accordingly, by positioning and press-fitting the inner end of the terminal portion 13a into the portion of the opening edge of the press-fitting groove 11 where the tapered surfaces 11a and 11b face each other, a partition portion is formed on the front and back surfaces of the terminal portion 13a. 11c, 11d, and 11e are in pressure contact, and the side surface of the base 10 and the outer end surfaces of the terminal portions 13a and 14a are flush with each other.
Similarly, the inner end of the terminal portion 14a is positioned and press-fitted into the portion of the opening edge of the press-fitting groove 12 where the tapered surfaces 12a and 12b face each other, thereby partitioning the front and back surfaces of the terminal portion 14a. The portions 12c and 12d are in pressure contact, and the side surface of the base 10 and the outer end surface of the terminal portion 14a are flush with each other.
Then, the assembly work is completed by fitting the case 20 to the base 10 assembled with the electromagnet block 16 and the like.
[0015]
According to this embodiment, a gap as in the conventional example does not occur at the bottom edge of the base 10. For this reason, similarly to the first embodiment described above, it is possible to prevent entry of foreign substances such as ants and unnecessary entry of the sealant. Others are the same as in the first embodiment described above, and a description thereof is omitted.
[0016]
In addition, the said partition part does not necessarily need to be a pair, and what is necessary is just to provide a suitable number as needed. Moreover, it is not necessary to arrange so that it may oppose, and you may provide in a zigzag form.
[0017]
【The invention's effect】
As is apparent from the above description, according to the electromagnetic relay according to claim 1, the protrusion provided on the inner side surface of the case is joined to the tapered surface provided on the side surface of the base and the outer end surface of the press-fitted terminal portion. . For this reason, a gap as in the conventional example does not occur at the bottom edge of the base. As a result, since it prevents unnecessary penetration of foreign material from entering or sealing agent such as ants, it is possible to prevent occurrence of operation failure, saves sealant, there is an effect that the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a first embodiment of an electromagnetic relay according to the present invention.
FIG. 2 is an exploded perspective view of the electromagnetic relay shown in FIG.
FIG. 3 is a perspective view when the electromagnetic relay case shown in FIG. 1 is viewed from different angles.
FIG. 4 is an enlarged view of a main part of the electromagnetic relay shown in FIG.
FIG. 5 is a perspective view showing a second embodiment of the electromagnetic relay according to the present invention.
6 is an enlarged perspective view from a different angle of the electromagnetic relay shown in FIG. 5. FIG.
7 is an enlarged perspective view of a base of the electromagnetic relay shown in FIG.
FIG. 8 is an enlarged front view of the base of the electromagnetic relay shown in FIG.
FIG. 9 is a perspective view showing an electromagnetic relay according to a conventional example.
10 is an exploded perspective view of the electromagnetic relay shown in FIG.
11 is an exploded perspective view of a main part of the electromagnetic relay shown in FIG.
12 is an enlarged view of a main part of the electromagnetic relay shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Base, 11, 12 ... Press-fit groove | channel, 11a, 11b, 12a, 12b ... Tapered surface, 11c, 11d, 11e, 12c, 12d ... Partition part, 13 ... Movable contact piece, 14 ... Fixed contact piece, 13a, 14a ... terminal part, 20 ... case, 21,22 ... projection.

Claims (1)

In the electromagnetic relay in which a tapered surface is formed at the opening edge of the terminal press-fitting groove provided on the side surface of the base, the terminal is press-fitted from the side through the tapered surface, and the case is fitted to the base.
The outer end surface of the terminal press-fitted into the press-fitting groove of the base is disposed at the bottom of the tapered surface, while the inner surface of the case is provided with a protrusion that joins the outer end surface of the terminal and the tapered surface, An electromagnetic relay, wherein the case is fitted into a base from above.

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