JPH0727190U - Printed circuit board holding case structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a printed circuit board holding case in which the printed circuit board is temporarily fixed, and the upper and lower cases are reliably positioned and fixed during assembly, thereby reducing the number of parts. [Structure] A cut-and-raised portion 10 for holding a printed circuit board 8 is formed in a lower case 6, and a hole portion 12 is formed between the cut-and-raised portion 10 and a bottom surface 11. The upper case 3 is formed with a hook-shaped claw portion 13 that engages with the hole portion 12 formed in the lower case 6.
The claw 13 is engaged with the printed circuit board 8 and the upper and lower cases 3, 6
And are fixed with screws 9.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board holding case structure, and more particularly to a holding case structure that holds a printed circuit board in a metal case and that allows easy assembly of upper and lower cases.

[0002]

[Prior art]

 Conventionally, as shown in FIGS. 4 and 5, the bottom surface is opened, and side walls 1A, 1B, 1C, and 1D are provided on four sides, and a pair of opposing side walls 1B and 1D are provided with mounting pieces 2, respectively. The upper case 3 and the upper surface are opened, and the side walls 4A, 4B, 4C, and 4D are provided on four sides, and the mounting pieces 5 corresponding to the mounting pieces 2 of the upper case 3 are respectively provided on the pair of facing side walls 4B and 4D. The metal lower case 6 and the electronic parts (not shown) are mounted respectively, and the through holes corresponding to the screw holes 2A, 5A provided in the mounting pieces 2, 5 of the upper case 3 and the lower case 6 are mounted in a square shape. The upper and lower cases 3 and 6 are sandwiched by the upper and lower cases 3 and 6, and the mounting pieces 2 and 5 of the upper and lower cases 3 and 6 and the through-hole portion 7 of the printed board 8 are screwed together. It was fixed using.

[0003]

[Problems to be solved by the device]

 However, according to the above structure, four screws need to be fastened to fix the printed circuit board 8, the number of components is large, and the printed circuit board 8 is fixed at the same time as the upper and lower cases 3 and 6 without positioning. Therefore, it was difficult to assemble and required a lot of man-hours.

[0004]

[Means for Solving the Problems]

 Therefore, in order to solve the above problems, the present invention provides a printed circuit board, a lower case having an upper surface opened and a bottom surface and a side wall, and the lower case holds the printed circuit board on the side wall. An upper case having a cut-and-raised part and a hole between the cut-and-raised part and the bottom surface, and having a side wall with an opened lower surface; and in this upper case, the hole part at the lower end of the side wall. And a claw portion that engages with and contacts the bottom surface of the lower case.

[0005]

[Action]

 Temporarily fix the printed circuit board with the cut-and-raised part of the lower case, position the upper case and the lower case, and fix them.

[0006]

【Example】

 Hereinafter, the gist of the present invention will be specifically described based on the embodiments shown in FIGS. 1 to 3, but the same or corresponding parts as those of the conventional example will be designated by the same reference numerals, and detailed description thereof will be omitted.

The upper surface is opened so as to cover electronic components (not shown) mounted on both sides of the printed circuit board 8, and the lower case 6 made of metal and having four sides surrounded by side walls 4A, 4B, 4C, and 4D is opposed. Inside the one side wall 4B of the side walls 4B and 4D, a cut-and-raised portion 10 for sandwiching and holding the printed circuit board 8 and a hole 12 is formed between the cut-and-raised portion 10 and the bottom surface 11 of the lower case 6, On the outer side of the upper end of the other side wall 4D, a mounting piece 5 having a screw hole 5A is formed.

Then, a metal upper case 3 whose lower surface is opened and four surfaces are surrounded by side walls 1A, 1B, 1C, and 1D is provided, and a lower case 6 is provided at a lower end of one side wall 1B of the opposing side walls 1B and 1D. To form a hook-shaped claw portion 13 which is engaged with the hole portion 12 formed in the above and faces inward. The claw portion 13 has an obtuse angle of 90 ° + α with respect to the side wall. Further, two mounting pieces 2 having screw holes 2A corresponding to the screw holes 5A provided in the mounting piece 5 of the lower case 6 are formed outside the lower end portion of the other side wall 1D.

The method of assembling the printed circuit board 8, the upper case 3 and the lower case 6 is to move the printed circuit board 8 to the lower case 6 in the direction of the arrow in FIG. 1 and cut and raise one end of the printed circuit board 8. Then, the claw portion 13 of the upper case 3 is locked in the hole 12 of the lower case 6. At this time, since the claw portion 13 is given an obtuse angle with respect to the side wall 1B, the claw portion 13 abuts on the bottom surface 11 of the lower case 6, and a force acts in the direction of pushing the bottom surface 11 to attach the upper case 3. The piece 2, the printed circuit board 8 and the attachment piece 2 of the lower case 6 are fixed by the screw 9, and it is possible to prevent rattling after the upper case 3 and the lower case 6 are assembled.

In addition, when forming the cut-and-raised portion 10 of the lower case 6 of the present invention, first, the hole 12 is first formed, and then a cut is made to form the cut-and-raised portion 10, and the cut is performed by pressing with a press. The raised portion 10 is formed so as to project inward. By forming in this way, it is not necessary to separately form the cut-and-raised portion 10 for holding the printed circuit board 8 and the hole portion 12 for engaging the claw portion 13 of the upper case 6, but they can be formed at the same time, reducing the number of steps. it can .

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the gist of the present invention. For example, the cut-and-raised part 10 of the lower case 6 and the mounting piece 5 are provided on the opposing side walls 4B and 4D, but it is not necessary to provide them on the opposing side walls 4B and 4D, as long as the printed circuit board 8 can be held. The attachment piece 5 may be provided on the other side walls 4A and 4C.

[0012]

[Effect of device]

 With the above configuration, the printed circuit board is built-in, and the printed circuit board can be positioned when fixing the upper and lower cases to the printed circuit board.Furthermore, after the upper and lower cases are assembled and fixed, rattling due to dimensional errors in the upper and lower cases can be prevented, and the assembly can be done. There is a very effective effect that can be surely done.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment according to the present invention.

FIG. 2 is a sectional view of the embodiment.

FIG. 3 is a sectional view of a claw portion of the upper case of the embodiment.

FIG. 4 is an exploded perspective view of a conventional example.

FIG. 5 is a sectional view of a conventional example.

[Explanation of symbols]

1A, 1B, 1C, 1D, 4A, 4B, 4C, 4D Side wall 3 Upper case 6 Lower case 8 Printed circuit board 9 Screw 10 Cut and raised part 11 Bottom face 12 Hole part 13 Claw part

Claims (1)

[Scope of utility model registration request] 1. A printed circuit board, a lower case having an upper surface opened and a bottom surface and a side wall, a cut-and-raised part for holding the printed circuit board on the side wall, the cut-and-raised part, and the lower case. An upper case having a hole between the bottom surface and a bottom surface and having a side wall, and a claw for engaging the hole at the lower end of the side wall and abutting the bottom surface of the lower case on the upper case. A holding case structure for a printed circuit board, comprising: