JP2633483B2 - Printed wiring board fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a printed wiring board to a housing.

[0002]

2. Description of the Related Art FIG. 8 is a perspective view showing an example of a conventional device for accommodating and fixing a printed wiring board in parallel with a housing bottom plate. In FIG. 8, the printed wiring board 4 is accommodated and fixed in parallel with the housing bottom plate 21 of the box-shaped housing 1 having an open top, and bosses 22 having seats 23 at the top are erected at four corners of the housing bottom plate 21. The seat 23 has a screw hole into which the small screw 24 is screwed. To accommodate and fix the printed wiring board 4 in the housing 1, the lower surfaces of the four corners of the printed wiring board 4 are placed on the seats 23 of the bosses 22, aligned with the screw holes, and then the printed wiring board 4 is used with small screws 24. Fixed.

Further, as a prior art for fixing a printed wiring board without using screw fastening, Japanese Patent Application Laid-Open No. Hei 4-27697.
There is an official gazette. In this prior art, a gate-type fixing tool is set up at four corners of a bottom surface of a housing, and the printed wiring board is fixed to the fixing tool by using a spring plate that works freely with respect to a corner of the printed wiring board. .

[0004]

In this conventional printed wiring board fixing structure, a small screw must be screwed when mounting and removing the printed wiring board. There are disadvantages such as the necessity of matching, and the installation and removal work is troublesome, and when the printed wiring board is removed, small screws may be lost.

[0005] Japanese Unexamined Patent Publication No. Hei 4-27697 discloses that the fixing member takes a large space on the housing because the fixing tool is a pillar type, and the fixing spring plate does not act in the thickness direction of the substrate. There is a drawback that the fixing does not follow the change in the plate thickness, and the fixing becomes unstable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. A printed wiring board which can be easily mounted and removed and has no danger of losing parts, has a simple structure, and can securely fix the board. It is intended to provide a substrate fixing structure.

[0007]

According to the present invention, there is provided a printed wiring board fixing structure, comprising: a guide pin having a shape of a truncated cone having a diameter reduced toward an end thereof, the guide pin penetrating the guide pin; A printed circuit board having a first hole and a pair of fixing holes formed at regular intervals in the vicinity of the first hole; A fixture having a U-shaped mounting portion and a lever portion extending diagonally upward from the mounting portion and rotatable by the spring property; and wherein the mounting portion has the U-shaped portion. The printed wiring board has gaps of substantially the same dimensions as the thickness of the printed wiring board, and has second holes through which the guide pins penetrate on upper and lower surfaces facing each other. Insert A pair of inverted V-shaped lock claws are fitted at the front ends of the U-shaped lower surfaces so as to fit into the pair of fixing holes, respectively, while penetrating the guide pin through the first and second holes. And the printed circuit board and the guide pin are attached and fixed, and the lever portion has a third hole through which the guide pin passes and a sawtooth-shaped portion formed at the upper end of the third hole. Have
The saw-toothed portion rotated by the spring property of the lever portion bites and is fixed to the guide pin passing through the third hole portion.

[0008]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view showing a printed wiring board according to an embodiment of the present invention before being fixed. FIG. 2 is a perspective view showing an attached state of the embodiment of the present invention. FIG. 2B is a view in which a fixing bracket is mounted, FIG. 3B is a view in which guide pins are further mounted in FIG. 2A, FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2A, and FIG. FIG. 4 shows a cross-sectional view taken along line BB;
FIG. 5A is a diagram illustrating an inserted state of a printed wiring board, FIG. 5B is a diagram illustrating a fixed state of the printed wiring board, FIG.
FIG. 6 is a perspective view of a second embodiment of the present invention, and FIG. 7 is a perspective view of a third embodiment of the present invention. Hereinafter, an embodiment of the present invention will be described with reference to these drawings.

As shown in FIG. 1, the fixing bracket 7 is formed by bending a metal plate having a spring property, and has a U-shape having a gap substantially equal to the thickness of the printed wiring board 4. The upper and lower surfaces of the U-shaped mounting portion 8 have a diameter substantially equal to the root diameter of the guide pin 2 so that the truncated conical guide pin 2 standing on the housing 1 can pass through. Each has a hole 10. Further, at the tip of the lower surface of the U-shaped mounting portion 8, an inverted V-shape is formed to fit into two fixing holes 6 provided on the printed wiring board 4, and the inverted V-shape is formed. The portion protrudes slightly inward from the U-shaped gap, and has two lock claws 9 at a distance substantially equal to that of the fixing hole 6. Further, a lever portion 13 described later is provided on the upper portion of the mounting portion 8 so as to extend and rotate freely.

The printed wiring board 4 has a hole 5 having a diameter substantially equal to the root diameter of the guide pin 2 so that the guide pin 2 of the housing 1 can be engaged. It has a fixing hole 6 having a square hole substantially equal to the outer dimensions of the lock claw 9 having a U-shape.

In such a configuration, as shown in FIGS. 2A and 3, the fixing metal 7 is fixed to the printed wiring board 4. By inserting the mounting portion 8 of the fixing member 7 from the lateral direction of the printed wiring board 4 toward the fixing hole 6 of the printed wiring board 4, the lower surface of the U-shaped mounting portion 8 becomes the lock claw portion 9. Deflected by the protrusion. The lock claw portion 9 reaches the fixing hole portion 6 by inserting the U-shaped mounting portion 8 in the bent state until the vertical surface of the U-shaped mounting portion 8 hits the end surface of the printed wiring board 4. Here, the elasticity of the inverted V-shaped lock claw portion 9 restores the bending of the lower surface of the mounting portion 8, and the lock claw portion 9 is fitted into the fixing hole portion 6, so that the fixing bracket is attached to the printed wiring board 4. 7 is fixed.

Next, a lever portion 13 is provided above the mounting portion 8 of the fixture 7. The lever portion 13
The mounting portion 8 is bent from the end of the U-shaped upper surface and extends obliquely upward, and can rotate about the end of the upper surface as a center of rotation due to its spring property. This lever part 1
3 is a hole 11 which is slightly larger than the root diameter of the guide pin 2 and is long in the direction of rotation of the lever 13 so that the guide pin 2 can pass through and the lever 13 can rotate.
It has. Further, on the upper surface side of the hole portion 11, a plurality of saw-tooth-shaped portions 12 are provided by integral punching. Further, the guide pin 2 is formed to have a truncated conical portion 3 whose tip is thinner than the root diameter, and is set up at several places in the housing 1. The root diameter of the truncated conical portion 3 of the guide pin 2 is substantially equal to the diameter of the hole 5 of the printed wiring board 4. Generally, since a rectangular printed wiring board 4 is often used,
The guide pins 2 are also set up at four places in the housing 1.

The fixing state of the printed wiring board 4 according to this embodiment will be described. 2 (b), 4 (a),
(B) As shown in FIG. 5, when fixing the printed wiring board 4, the printed wiring board 4 with the fixing metal 7 fixed as described above is inserted from the hole 5 along the guide pins 2. . Then, by manually pressing the lever portion 13 in the direction of arrow F (FIG. 4A), the saw-tooth-shaped portion 12 is separated from the guide pin 2 and the printed wiring board 4 is temporarily fixed to the housing 1. When the hand is released, the lever 13 returns in the direction of arrow f due to its elastic force (FIG. 4B), and the saw-tooth-shaped portion 12 bites into the guide pin 2 to fix the printed wiring board 4 and the housing 1. Complete.

As described above, the printed wiring board fixing structure according to the present embodiment uses the fixing metal having the mounting portion and the fixed portion integrated with each other by using a spring metal plate, thereby fixing the printed wiring board. Can be performed easily and reliably.

In the above-described embodiment, the hole 13 and the saw-tooth-shaped part 12 are integrally punched and formed as the lever 13 of the fixture 7.
As shown in the embodiment, U is attached to the lever portion 13a of the fixture 7a.
The lever portion may be formed by providing a U-shaped hole portion 14 and fixing a separately formed saw-tooth-shaped portion 15 to the upper opening portion of the U-shape.

Further, the biting means by the guide pin 2 and the saw-toothed portion 12 in the present embodiment may be reversed to fix them together. That is, as in the third embodiment shown in FIG. 7 (the printed wiring board 4 is not shown),
The lever portion 13b has a hole 16 having a straight non-sawtooth straight portion 16a on the upper surface side, and a guide pin 2a passing through the hole 16 has a threaded portion 1 on its peripheral surface.
7 are screwed, and the straight portion 16a of the hole 16 bites into an appropriate place of the threaded portion 17 of the guide pin 2a, so that both can be fixed.

[0018]

As described above, the present invention has a U-shaped mounting portion for bending a metal plate having spring properties and fixing it to a printed wiring board, and a protruding lock claw portion. In addition, by providing a fixing bracket having a hole having a serrated portion for biting and fixing the guide pin from the housing by its spring property, the printed wiring board can be easily attached to and detached from the housing, and the components can be easily mounted. There is an effect that the printed wiring board can be securely fixed without the risk of loss of the printed circuit board, the structure is not complicated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a printed wiring board according to an embodiment of the present invention before being fixed.

FIGS. 2A and 2B are perspective views showing an attachment state of one embodiment of the present invention, wherein FIG. 2A is a diagram in which a fixing bracket is attached to a printed wiring board, and FIG. 2B is a diagram in which guide pins are further attached to FIG. FIG.

FIG. 3 is a sectional view taken along line AA of FIG.

FIGS. 4A and 4B are cross-sectional views taken along the line BB of FIG. 2B, wherein FIG. 4A is a diagram illustrating an inserted state of a printed wiring board, and FIG.

FIG. 5 is a side sectional view showing an overall situation where one embodiment of the present invention is fixed to a housing.

FIG. 6 is a perspective view of a second embodiment of the present invention.

FIG. 7 is a perspective view of a third embodiment of the present invention.

FIG. 8 is a perspective view showing an example of a conventional printed wiring board fixing structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2, 2a Guide pin 3 Truncated cone part 4 Printed wiring board 5, 10, 11, 14, 16 Hole part 6 Fixing hole part 7, 7a, 7b Fixing fixture 8 Mounting part 9 Lock claw part 12, 15 Serrated Part 13, 13a, 13b Lever part

Claims (3)

(57) [Claims] 1. A guide pin having a shape of a truncated cone having a diameter reduced toward an end thereof and standing at at least one portion of a housing, a first hole through which the guide pin passes, and the first hole. And a printed wiring board having a pair of fixing holes formed at regular intervals in the vicinity of the mounting portion, and a bent portion formed of a metal plate having a spring property, and a U-shaped mounting portion and an obliquely upward direction from the mounting portion. A fixture having a lever portion which is rotatable by the spring property; and wherein the mounting portion has a U-shaped portion having a gap having substantially the same dimension as the thickness of the printed wiring board. The printed wiring board has second holes through which the guide pins penetrate, and the printed wiring board is inserted into the U-shaped portion through the first and second holes. Through the guide pin At the same time, a pair of inverted V-shaped locking claws are provided at the front end of the U-shaped lower surface to fit into the pair of fixing holes, and the printed wiring board and the guide pins are attached and fixed. The lever portion has a third hole through which the guide pin passes, and a sawtooth-shaped portion formed at the upper end of the third hole;
The printed wiring board fixing structure, wherein the saw-tooth-shaped portion rotated by the spring property of the lever portion bites and is fixed to the guide pin passing through the third hole. 2. The method according to claim 1, wherein the saw-toothed portion of the lever portion is the third
2. The printed wiring board fixing structure according to claim 1, wherein the printed wiring board fixing structure is formed separately from the hole and fixed to the third hole. 3. The guide pin is provided with a threaded portion on the peripheral surface thereof, while the upper end of the third hole is provided with a linear portion instead of the sawtooth portion. 2. The printed circuit board fixing structure according to claim 1, wherein the screw portion and the straight portion bite and fix when the screw is passed through the third hole.