JPH067298U - Metal case joint structure - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides a joining structure for metal cases, which has excellent electromagnetic and electrostatic shielding ability and does not impair assembly workability. According to the present invention, in a joining structure in which a plurality of case members are joined to form a metal case containing an electrical component,
It is provided with a joint provided between the case members to be joined, and a bite joint 7 formed between the case members joined together by screwing between the case members as the joint is joined. With this configuration, the case members are completely in electrical contact with each other by the joint portion and the bite joint portion 7, and the contact area is increased to improve the electromagnetic and electrostatic shielding ability of the metal case. At the same time, it does not impair the assembly workability.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joining structure suitable for joining case members such as a frame of a metal case and a cover member.

[0002]

[Prior art]

 A conventional joining structure of this type of metal case will be described with reference to FIG.

In the joint structure shown in the figure, the lower end portion of the cover member 52 which also forms the metal case is joined to the end surface of the frame 51 which forms the metal case in a right angle arrangement, and for example, from the outside of the cover member 52 The bolts 53 are screwed into the frame 51 through the cover member 52 over the points. Inside the frame 51 and the cover member 52, an electric component section 54 having an electronic circuit mounted thereon is arranged.

However, in the case of the joint structure shown in FIG. 9, when there is an uneven portion 52a on the joint surface of the frame 51 and the cover member 52 as shown enlarged in FIG. 10, the frame 51 and the cover member 52 are formed. There is a problem in that the contact area between them is greatly reduced, and as a result, the contact resistance between the frame 51 and the cover member 52 is increased and the electromagnetic and electrostatic shielding ability of the metal case is reduced. .

FIG. 11 shows another example of a conventional joining structure. A part between the frame 51 and the cover member 52 is joined with a bolt 53, and a washer 55 is used to contact the bolt 53. The end portion of the conductor wire 56 is connected to the end surface of the frame 51 with solder 57.

However, in the case of the joint structure shown in FIG. 11, the electrical contact area between the frame 51 and the cover member 52 is limited to the peripheral area of the bolt 53, the washers 55 at both ends of the conducting wire 56, and the area of the band 57. In many cases, the electromagnetic and electrostatic shielding ability of the metal case was insufficient.

Further, increasing the number of the bolts 53 and the solder 57 in order to increase the contact area causes a difficulty in assembling workability.

[0008]

[Problems to be solved by the device]

 As described above, the conventional joining structure has a problem in that the metal case has insufficient electromagnetic and electrostatic shielding ability.

Therefore, an object of the present invention is to provide a joining structure for a metal case that has excellent electromagnetic and electrostatic shielding capabilities and does not impair assembly workability.

[0010]

[Means for Solving the Problems]

 The present invention relates to a joining structure in which a plurality of case members are joined together to form a metal case containing an electrical component, and the joining members provided between the joining case members are joined together with the joining members. And a bite joint formed between the case members that are joined together by screwing between the case members.

[0011]

[Action]

 According to the joining structure having the above-described configuration, a joining portion that joins a plurality of case members is formed, and, for example, by screwing to form a biting joining portion between these case members, these case members are joined. Since the contact portion and the bite-in joint portion are in complete electrical contact with each other, the contact area is increased and the electromagnetic and electrostatic shielding ability of the metal case can be improved.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail.

In the joining structure of the metal cases shown in FIG. 1, the cover member 2 also forming the metal case is arranged at a right angle on the end surface of the frame 1 forming the metal case, and the cover members 2 are provided below both end edges of the cover member 2. A pair of joining pieces 3a, 3b bent in an L shape are joined to the end faces of the frame 1, and screws provided on the end faces of the frame 1 through the holes 3c, 3d provided in the pair of joining pieces 3a, 3b. The cover member 2 is attached to the frame 1 in a close contact state by screwing the bolt 4 into the hole.

The pair of joining pieces 3a, 3b, the holes 3c, 3d, the bolt 4, and the screw hole form a screw-fastening joining portion 5 as a joining portion.

Between the pair of joining pieces 3 a and 3 b, a bending joining piece 6 is provided along the width direction of the cover member 2. The bent joint piece 6 is bent obliquely downward from the back surface side of the cover member 2, and as shown in FIG. 2, the lower end portion 6 a of the bent joint piece 6 is joined to the joint piece 3 a. It is formed so as to reach a portion slightly below the portion 3e of the frame 3b, which is joined to the upper surface of the frame 1.

The lower end 6 a of the bent joint piece 6 and the region where the lower end 6 a of the frame 1 is joined together form a bite joint 7.

According to the joining structure having the above-described configuration, the cover member 2 is arranged at a right angle on the end surface of the frame 1, and a pair of joining pieces bent in an L-shape are provided at the lower end edges of the cover member 2. As shown in FIG. 3, the lower end portions 6a of the bent joint pieces 6 bite into the corresponding joint areas in the frame 1 and the bite joint portions 7 as shown in FIG. Is formed.

As a result, the frame 1 and the cover member 2 are brought into complete electrical contact with each other by the screwed joint portion 5 and the bite joint portion 7, and the contact area between the two is increased to increase the metal contact. The electromagnetic and electrostatic shielding ability of the case can be improved. Further, since the frame 1 and the cover member 2 can be attached only by screwing the work in two places, the assembly workability is not impaired.

Needless to say, the joining method can be a method other than screwing.

Next, another embodiment of the present invention will be described with reference to FIGS. 4 and 5.

In the joining structure shown in FIG. 4, the cover member 12 forming the metal case is arranged at a right angle on the upper surface of the end portion of the frame 1 forming the metal case, and the cover members 12 are formed on the lower end edges of the cover member 12. The pair of L-shaped bent joint pieces 13a, 13b are joined to the upper surface of the frame 1 and are provided on the upper surface of the frame 1 through the holes 13c, 13d formed in the pair of joint pieces 13a, 13b. The cover member 12 is attached in close contact with the frame 1 by screwing the bolt 14 into the screw hole.

The pair of joint pieces 13 a, 13 b, the holes 13 c, 13 d, the bolt 14, and the screw hole form a screw joint portion 15.

A saw-tooth joint piece 16 is provided along the width direction of the cover member 12 between the pair of joint pieces 3 a and 3 b. As shown in FIG. 5, the lower end portion 16a of the saw-toothed joint piece 16 is formed so as to extend slightly below the lower surface of the joint pieces 13a and 13b. The lower end portion 16a of the serrated joint piece 16 and the region of the cover member 12 corresponding to the lower end portion 16a form a bite joint portion 17.

According to the joining structure having the above-described structure, the cover member 12 is arranged at a right angle on the upper surface of the end portion of the frame 1, and a pair of L-shaped joined members provided on both end edges of the cover member 12 are joined together. By attaching the pieces 13a and 13b to the frame 1 in a close contact state with the bolts 14, the lower end portion 16a of the saw-tooth joint piece 16 bites into a corresponding joint area in the frame 1 to form a bite joint portion 17.

As a result, the frame 1 and the cover member 2 are brought into complete electrical contact with each other by the screwed joint portion 15 and the bite joint portion 17, so that the contact area between the two becomes large and the metal case becomes large. The electromagnetic and electrostatic shielding ability of can be improved. Further, since the frame 1 and the cover member 12 can be attached only by screwing the work in two places, the assembling workability is not impaired.

Next, another embodiment of the present invention will be described with reference to FIG.

The joining structure shown in FIG. 4 is substantially the same as the joining structure shown in FIG. 4, but the shape of the joining pieces 23a and 23b provided on both edges of the cover member 12 forming the metal case is the same as the joining piece. It is different from 13a and 13b.

That is, in the case of the joint structure shown in FIG. 6, the joint pieces 23 a and 23 b are provided so as to project from both end edges of the cover member 12 so as to have a substantially U shape. The lower end portion 16a of the saw-toothed joint piece 16 formed between the joint pieces 23a and 23b is formed so as to extend slightly below the inner surface of the upper piece 23e of the joint pieces 23a and 23b.

Further, holes 23c and 23d are formed in the side pieces 23f of the joining pieces 23a and 23b.

Further, the distance x between the upper piece 23e and the lower piece 23g of the joining pieces 23a and 23b is set to be slightly smaller than the thickness L of the frame 1 (x <L).

In the case of this joining structure, the saw teeth are formed by forcibly attaching the joining pieces 23a and 23b to the end faces of the frame 1 and screwing the bolts 14 into the end faces of the frame 1 through the holes 23c and 23d. The lower end portion 16a of the strip-like joint piece 16 bites into the corresponding joint area in the frame 1, and the bite joint portion 17 is formed.

As a result, the frame 1 and the cover member 12 come into complete electrical contact with each other by the screwed joint portion 15 and the bite joint portion 17, and the contact area between them becomes large. The electromagnetic and electrostatic shielding ability of the metal case can be improved. Further, since the frame 1 and the cover member 12 can be attached only by screwing work in two places, the workability of assembling is not impaired.

Next, still another embodiment having the fitting portion 31 having the fitting structure will be described.

The joining structure shown in FIG. 8 is provided with L-shaped joining pieces 33a and 33b formed on the lower portions of both ends of the cover member 2 and a serrated joining piece 34 between the joining pieces 33a and 33b. It

The distance between the lower end 34a of the saw-toothed joint piece 34 formed between the joint pieces 33a and 33b and the upper surface of the joint pieces 33a and 33b is set to be slightly smaller than the thickness of the frame 1. is doing.

In the case of this joining structure, the joining pieces 33 a and 33 b are forcibly joined to both ends of the frame 1 while pressing the saw-toothed joining piece 34 of the cover member 2 against the upper surface of the protrusion 1 a provided on the frame 1. As a result, the joint portion 31 and the bite joint portion 35 having the fitting structure are formed.

Also in the case of the joint structure in which the joint portion 31 and the bite joint portion 35 are formed, the same effect as in the case described above can be exhibited, and the cover member 2 is supported by the bite joint portion 35. Moreover, the cover member 2 can be positioned by the stepped portion of the frame 1 formed by the protruding portion 1a.

The present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the invention.

[0039]

EFFECTS OF THE INVENTION According to the present invention described in detail above, because of the above-described configuration, the case members are in complete electrical contact by the joint and the bite joint, and the contact area is large. As a result, the electromagnetic and electrostatic shielding ability of the metal case can be improved, and the assembly workability is not impaired.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a joining structure of the present invention.

FIG. 2 is a cross-sectional view of a cover member according to this embodiment.

FIG. 3 is a cross-sectional view of the joint structure of the present embodiment.

FIG. 4 is a perspective view of a joining structure according to another embodiment of the present invention.

5 is a cross-sectional view of the joint structure shown in FIG.

FIG. 6 is a perspective view of a joining structure according to another embodiment of the present invention.

7 is a cross-sectional view of the joint structure shown in FIG.

FIG. 8 is a perspective view of a joining structure according to still another embodiment of the present invention.

FIG. 9 is a perspective view of a conventional joining structure.

FIG. 10 is an enlarged sectional view of a conventional joining structure.

FIG. 11 is a perspective view of another conventional joining structure.

[Explanation of symbols]

 1 frame 2 cover member 3a, 3b joining piece 5 screwing joining portion 7 biting joining portion

Claims (1)

[Scope of utility model registration request] 1. In a joining structure in which a plurality of case members are joined to form a metal case containing an electrical component, a joining member provided between joining case members and the joining member are joined together. A joint structure for a metal case, comprising a bite joint portion formed between case members joined together by screwing between the case members.