JPH0350895A - Fixation metal fitting of printed board - Google Patents

Abstract

PURPOSE:To suppress a warp of a printed board, to simply ground a part between printed boards and to enhance an operation property by a method wherein a main part is formed to be a frame-shaped rectangular parallelepiped, a plurality of elastic legs are provided on a face on the side of a chassis and a plurality of elastic claws are provided on a face opposite to the chassis. CONSTITUTION:A fixation metal fitting 24 is formed to be a frame-shaped rectangular parallelepiped by bending a pressed metal sheet; it is provided, at the lower part on the side of its open-end face, with elastic legs 29 whose both tip parts are directed to the outside and which have been bent to be Z-shaped. The fixation metal fitting 24 is also provided with rise pieces 30 from four corners of its upper part; their outside faces are provided with elastic claws 31 which have been cut and erected from the lower side. The individual elastic legs 29 of the fixation metal fitting 24 are bent; their tip parts are passed through individual installation holes 26 in a first printed board 22 and are held by their tip crooked parts 291; while the individual elastic legs are being bent mutually inward, their tip parts are inserted into the installation holes 20 in a chassis 21 and are hooked elastically. Then, while the elastic claws 31 are being bent, the individual rise pieces 30 of the fixation metal fitting 24 are inserted into and are hooked by individual installation holes 32 in a second printed board 23; the rise pieces 30 are fixed to a ground line of the printed board 23 by using a solder. This assembly is covered with a cover 25 from its upper part and is fixed to the chassis 21.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fixture for fixing a printed circuit board to a chassis in an electronic device.

2. Description of the Related Art In recent years, in the electrical industry, mounting technology for electronic devices has improved, and high-density mounting is required. Moreover, in order to reduce costs, there is a demand for a system that uses stacked single-sided boards instead of multilayer boards.

FIG. 5 shows an example of such a conventional mounting method in which single-sided boards are stacked one on top of the other. In Figure 5, 1
2 is a chassis, 2 is a boss fixed to the chassis 1, 3 is a first printed circuit board, 4 is a second printed circuit board, 5 is a brass support column fixed to the printed circuit board 3 via an insulating washer 6, 7 8 is a connector assembly connected to the printed circuit boards 3 and 4, and 8 is an insulating washer 9 and the printed circuit board 4.
10 is a cover that is fixed to the chassis 1 from above the printed circuit board 3.4.

Next, the assembly order of this printed circuit board fixing fitting will be explained. First, a boss 2 is fixed to the chassis 1 by an appropriate method, and a first printed circuit board 3 is placed on the boss 2. Attachment holes 11 having a diameter smaller than the diameters of the boss 2 and the support column 5 are formed at the four corners of the printed circuit board 3. Further, a screw hole 12 is formed in the upper surface of the boss 2, and a screw 13 is formed in the lower part of the support column 5. Therefore, strut 5
First, the first printed circuit board 3 is fixed to the chassis 1 by screwing and fixing the screw 13 into the screw hole 12 of the boss 2 through the insulating washer 6 and the mounting hole 11. Next, the second printed circuit board 4 is placed on the support column 5. Attachment holes 14 having a diameter smaller than the diameter of the support column 5 are formed in the four corners of the second printed circuit board 4, and a screw hole 15 is formed in the upper surface of the support column 5. Therefore, by screwing and fixing the screw 8 into the screw hole 15 of the support column 5 through the insulating washer 9 and the mounting hole 14, the second printed circuit board 4 can be mounted on the chassis with a predetermined distance from the first printed circuit board 3. Fixed on 1. Then, the cover 10 is placed over these and fixed to the chassis 1, thereby completing the assembly.

Problems to be Solved by the Invention However, such a conventional configuration has the following problems.

(1) Warpage of the printed circuit board cannot be suppressed.

(2) One pin of the connector assembly is required to ground between the printed circuit boards.

(3) Workability is poor because assembly involves rotating screws.

In view of the above problems, it is an object of the present invention to provide a printed circuit board fixing fitting that suppresses warpage of printed circuit boards, allows easy grounding between printed circuit boards, and has good workability.

Means for Solving the Problems In order to solve the above-mentioned problems, the printed circuit board fixing fitting according to the present invention has a main part formed in a frame-shaped rectangular parallelepiped, and a first printed circuit board attached to the chassis on the chassis side surface. A plurality of elastic legs are provided for fixing the second printed circuit board, and a plurality of elastic claws are provided on the surface opposite to the chassis for fixing the second printed circuit board. The function fixing bracket is formed into a frame-shaped rectangular parallelepiped, so it is possible to suppress warping of the printed circuit board, and since the fixing bracket is conductive, it is possible to easily ground between the printed circuit boards.Furthermore, the elastic legs and Since the printed circuit board is held in place by the elastic claws, assembly is facilitated, and assembly work efficiency is greatly improved.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, 21 is a chassis, 22 is a first printed circuit board, 23 is a second printed circuit board, 24 is a fixture, 2
5 is a cover.

The chassis 21 is made of a metal plate, and has markings on the four corners of its bottom surface.
The stamping process forms horizontal mounting holes 26 that face inward from each other as shown in the cross-sectional view of FIG. A rectangular mounting hole 2 is provided in a portion of the first printed circuit board 22 that corresponds to the mounting hole 26 of the chassis 21.
7 is formed.

The fixing fitting 24 is formed into a frame-shaped rectangular parallelepiped by folding a pressed metal plate, and both end surfaces in the longitudinal direction thereof are open, and a cross-braced reinforcing portion 28 is formed on the other surface. . The fixing metal fitting 24 is provided with elastic legs 29, which extend on both sides along the lower edge of the fixing metal fitting 24 at the lower part thereof on the open end surface side, and have elastic legs 29 whose image tips are bent outward in a Z-shape. The distance between the bent end portions 291 of the elastic legs 29 is approximately equal to the distance between the corresponding mounting holes 26 of the chassis 21. Fixing bracket 2
4 is also provided with rising pieces 30 as shown in FIG. 3 rising from the four corners of its upper part. This rising piece 30 is formed by cutting and raising using a press, and has elastic claws 31 cut and raised from the lower side on its outer side. Rectangular mounting holes 32 into which these rising pieces 30 are inserted are formed at the four corners of the second printed circuit board 23 . The cover 25 has dimensions that allow it to be elastically fitted onto the periphery of the chassis 21 . In addition, the mounting hole 27.
32 may be in the form of a groove as shown in FIG. In this case, the respective elastic claws 31 are formed inwardly toward each other.

Next, a printed circuit board 22.2 using this fixture 24
The assembly order in step 3 will be explained. First, each elastic leg 29 of the fixing metal fitting 24 is bent and its tip is passed through each mounting hole 26 of the first printed circuit board 22 to be held by the tip bent part 291, and then, similarly, each elastic leg 29 is connected to each other. While bending inward, the tip is inserted into the mounting hole 26 of the chassis 21 and is elastically locked. Next, each mounting hole 32 of the second printed circuit board 23 is inserted into each rising piece 30 of the fixing metal fitting 24 while bending the elastic claw 31 to lock it, and the rising piece 30 is fixed to the ground wire of the printed circuit board 23 with solder. do. A cover 25 is then placed over these and fixed to the chassis 21.

In the above embodiments, the shape of the fixture, including its reinforcing portion, can be changed in various ways, and the rectangular parallelepiped includes a perfect square and a rectangular shape. Further, the locking by the elastic legs and the elastic claws can be changed in various ways, and the number of locking points may be at least three in a triangular shape.In short, it is sufficient that the printed circuit board and the shear can be elastically and reliably locked.

Effects of the Invention As is clear from the above embodiments, the printed circuit board fixing fitting according to the present invention supports the printed circuit board with the frame-shaped rectangular parallelepiped portion, so it is possible to prevent the printed circuit board from warping.
In addition, since it is conductive, it is easy to ground between printed circuit boards, and it is easy to assemble because it is simply fitted using elastic legs and elastic claws without using screws, making assembly work easier. It has the advantage of being significantly improved.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a printed circuit board fixing fitting showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig.
The drawings are a partially enlarged view of FIG. 1, FIG. 4 is a partially enlarged view showing a modified embodiment of the present invention, and FIG. 5 is an exploded perspective view showing an example of a conventional printed circuit board fixing fitting. 21... Chassis, 22.23... Printed circuit board,
24... Printed circuit board fixing bracket, 25... Cover
26.27.32...Mounting hole, 28...Reinforcement part, 2
9... Elastic leg, 30... Standing piece, 31... Elastic claw.

Claims (1)

[Claims] This is a metal fitting that is inserted between multiple printed circuit boards to fix these printed circuit boards to the chassis.The main part is formed into a frame-shaped rectangular parallelepiped, and the chassis side surface has a metal fitting that passes through the mounting hole of the printed circuit board. A printed circuit board fixing bracket that has a plurality of elastic legs that are fixed to the mounting holes of the chassis, and a plurality of elastic claws that are fixed to the mounting holes of the printed circuit board on the opposite side of the chassis.