JPH0210600B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a method for attaching and detaching a printed board to an apparatus in which printed boards are mounted in upper and lower stages in a box-shaped casing with an openable top.

(b) Background of the technology In electronic equipment, communication equipment, etc., two printed boards slightly smaller than the area of the bottom plate of the case are placed one above the other in a shallow box-shaped case with an openable top. A miniaturized device attached to the device is often used.

FIG. 1 is a perspective view of an example of an apparatus in which two printed boards are mounted inside a housing.

4 of the bottom plate 1a of the shallow box-shaped housing 1 in the same figure.
A spacer 9 having a screw hole provided in the upper end surface is fixed to the corner. A lower printed board 3 having a similar shape to the bottom plate 1a and slightly smaller than the bottom plate 1a is placed on the spacer 9. The prismatic spacing bolt 6 is installed on the upper surface of the lower printed board 3 so that the threaded portion (threaded portion 6a in FIG. 2) protruding from its lower end surface passes through the insertion hole of the lower printed board 3. It is screwed onto the spacer 9, and the lower printed board 3
are fixed parallel to the bottom plate 1a.

The upper printed board 4 is placed on the upper end surface of the spacing bolts 6, and insertion holes are bored at positions corresponding to the respective spacing bolts 6. The upper layer printed board 4 has a screw passing through the insertion hole and screws into a screw hole provided on the upper end surface of the spacing bolt 6.
is fixed to.

A connector 7 and a connector 8 are mounted on the upper surface of the lower printed board 3 and the lower surface of the upper printed board 4, respectively, to be inserted into each other. It is configured to be inserted into the connector 7 while being fixed to the bolt 6. Note that mounting components are mounted on the upper surface of the lower printed board 3 and the lower surface of the upper printed board 4, respectively. Further, a cover 2 is attached to the housing 1 after the lower layer printed board 3 and the upper layer printed board 4 are attached.

Since the device is configured as described above, it has the advantage that the housing 1 can be made small and particularly thin.

It is necessary to remove the upper printed board 4 when performing maintenance and inspection of the mounted parts of the lower printed board 3 and the upper printed board 4 mounted in this manner. However, there is almost no gap between the outer edge of the upper layer printed board 4 and the side plate of the housing 1, and since the connector 8 is inserted into the connector 7, a considerable amount of removal force is required. It is not easy to attach and detach.

(c) Prior Art and Problems A and B in Figure 2 are cross-sectional views showing the conventional method of attaching and detaching a printed circuit board, respectively. Note that the same reference numerals indicate the same objects throughout the figures.

In the figure A, the headed bushing 11 has a threaded portion with a thread diameter desirably smaller than the diameter of the head at the lower part of the head, and a necked screw 13 screwed into the threaded hole 6b of the spacing bolt 6 at the axial center. A mating screw hole 11b and an escape hole 11a for the threaded portion of the necked screw 13 are provided. The head bushing 11 has a threaded portion that passes through an insertion hole in the upper printed board 4, and an upper end surface that is screwed into a screw hole in the spacer 10 that is in close contact with the lower surface of the upper printed board 4. It is fixed to the upper layer printed board 4 so as to sandwich the upper layer printed board 4 therebetween.

The lower end surface of the spacing bolt 10 is brought into contact with the upper end surface of the spacing bolt 6, the neck screw 13 is screwed into the threaded hole 6b of the spacing bolt 6, and the upper printed board 4 is fixed to the top of the spacing bolt 6. There is. In addition, neck screw 13
The head is attached to the head bushing 11 via the spring washer 12.
It is pressed against the upper end surface of.

FIG. 2B shows a state in which the upper layer printed board 4 is removed, and the attachment/detachment tool 14 has a handle portion 14c bent at both ends into a key shape, and a leg seat 14b is provided parallel to the handle portion 14c. Each leg seat 14b is provided with a cutout groove 14a that is convex in plan view.
The width of this convex large groove is larger than the head of the necked screw 13, and the small groove is larger than the neck and smaller than the head.

With all the neck screws 13 loosened, insert the large grooves of the convex notches 14a of the attachment/detachment tool 14 from above the respective headed bushes 11 attached to opposing positions of the upper printed board 4, and insert the attachment/detachment tool 14 horizontally to engage the small groove with the neck.
Then, hold the handle part 14c with your hand and attach/detach the tool 14.
pull up. Since the threaded portion of the head screw 13 is locked in the screw hole 11b of the head bush 11, the upper printed board 4 is pulled upward and the connection between the connectors 7 and 8 is released.

Further, in order to insert the upper layer printed board 4, the attachment/detachment tool 14 is pressed.

By using the attachment/detachment tool 14 in this manner, it is possible to prevent fingers from directly touching the upper printed board 4 and staining the pattern part, and there is no need to grasp the head of the neck screw, which is small and difficult to apply force. .

However, when neck screw 13 is loosened, neck screw 1
3 does not maintain a vertical state, so
Attach/remove tool 1 by holding each neck screw 13 with your fingers.
There is the hassle of having to insert 4. In addition, since the neck screw 13 is locked in the screw hole 11b of the head bush 11, a force for removing the connector is applied to this portion, and the thread of the screw hole 11b or the neck screw 13 is
There is a risk of damage to the threads.

(d) Purpose of the Invention The present invention was created in view of the above points, and it is possible to easily remove or attach the upper layer printed board, and to avoid the risk of staining the printed board. The purpose is to provide a method for attaching and detaching the board.

(e) Structure of the Invention In order to achieve the above object, the present invention, as illustrated in FIG. The upper layer printed board 4 superimposed on the board 3 is mechanically fixed to the lower layer printed board 3 via the spacing bolts 6, and the respective connectors mounted on the flat parts of both printed boards are mated and inserted. In a device that is electrically connected by attaching a button, there is a necked bush 15 on the top surface of the upper layer printed board 4.
neck screw 18 that is fixed and screwed onto the spacing bolt 6.
is held at the axial center of the necked bush 15.

On the other hand, the leg portions 14 provided at both ends of the handle portion 14c
An attachment/detachment tool 14 having a convex cutout groove 14a with grooves oriented in the same direction is provided in each of the grooves b.

Then, with the neck screw 18 loosened to release the screw connection between the neck screw 18 and the spacing bolt 6, use the attachment/detachment tool 14 to insert the small groove of the convex notch groove 14a into the neck 17 of the corresponding neck bush 15. By engaging and pressing the attachment/detachment tool 14, both connectors are inserted, or by pulling up the attachment/detachment tool 14, the connection of the connectors is released.

(f) Embodiments of the Invention The present invention will be described in detail below with reference to illustrated embodiments.

In FIG. 3, A is a sectional view and B is a perspective view of one embodiment of the present invention.

In Figure A, the neck bush 15 has a head 1.
A neck part 17 having a diameter smaller than the diameter of the head part 16 at the lower part of the neck part 6, a threaded part having a thread diameter desirably smaller than the diameter of the neck part 17 at the lower part of the neck part 17, and a screw hole 6b of the spaced bolt 6 at the axial center. A screw hole 15b into which the attached neck screw 18 is screwed, and an escape hole 15a for the threaded portion of the neck screw 18 are provided. Neck bush 15
The threaded part passes through the insertion hole of the upper layer printed board 4, and the upper end surface is screwed into the screw hole of the spacer 10 that is in close contact with the lower surface of the upper layer printed board 4. It is fixed to the upper printed board 4 so that the board 4 is sandwiched therebetween.

The lower end surface of the spacing bolt 10 is brought into contact with the upper end surface of the spacing bolt 6, the neck screw 18 is screwed into the threaded hole 6b of the spacing bolt 6, and the upper printed board 4 is fixed to the top of the spacing bolt 6. There is. In addition, neck screw 18
The head is connected to the neck bushing 15 via the spring washer 12.
It is pressed against the upper end surface of.

In FIG. 3B, with all the necked screws 18 loosened, the large grooves of the convex notch grooves 14a of the attachment/detachment tool 14 are fitted from above the necked bushes 15 mounted at opposing positions on the upper printed board 4. the neck 17 by moving the attachment/detachment tool 14 horizontally.
Engage the small groove with the Then, grasp the handle portion 14c with your hand and pull up the attachment/detachment tool 14. Since the neck bushing 15 is screwed onto the spacing pin 10, the upper layer printed board 4 is pulled upward and the connection between the connectors 7 and 8 is released.

Further, in order to insert the upper layer printed board 4, by pressing the attachment/detachment tool 14, the lower surface of the leg portion 14b presses the upper surface of the upper layer printed board 4, and the connector 8 can be easily inserted into the connector 7. .

In this way, there is always a gap equal to the height of the neck 17 between the head 16 of the necked bush 15 and the upper surface of the upper printed board 4, making it easy to insert the attachment/detachment tool 14.

It goes without saying that the direction of the grooves of the convex notched grooves 14a provided in the pair of legs 14b of the attachment/detachment tool 14 may be orthogonal to the handle portion 14c, unlike the illustrated example.

In the illustrated embodiment, the attachment/detachment tool is provided with a convex cutout groove, but a pothole-shaped hole may be used instead of a cutout groove.

(g) Effects of the Invention As explained above, the present invention prevents fingers from directly touching the upper printed board 4 and staining the pattern part, and also grips the heads of necked screws that are small and difficult to apply force to. This has excellent practical effects, such as the fact that there is no need to attach and detach the upper printed board and it is extremely easy to attach and detach.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an example of a device in which two printed boards are installed in the housing, A and B in Fig. 2 are cross-sectional views showing the conventional method of attaching and removing printed boards, and Fig. 3 is the invention according to the present invention. A is a sectional view, and B is a perspective view of one embodiment. In the figure, 1 is the housing, 3 is the lower printed board, 4 is the upper printed board, 6 is the spacing bolt, 9 is the spacer,
10 is the interval pin, 11 is the headed bush, 13, 18
14 is a necked screw, 14 is an attachment/detachment tool, 14a is a convex notch groove, 15 is a necked bush, 16 is a head, and 17 is a neck.

Claims (1)

[Claims] 1. A lower printed board 3 is fixed to the bottom plate side of a housing whose top can be opened, and an upper printed board 4 superimposed on the lower printed board 3 is connected to the machine via spacing bolts 6. In the device, the upper printed board 3 is fixed to the lower printed board 3 and electrically connected by fitting and inserting connectors mounted on the flat parts of both printed boards. A necked bushing 15 is fixed to the upper surface of the necked bushing 15, and a necked screw 18 screwed into the spacing bolt 6 is held at the axial center of the necked bushing 15. An attachment/detachment tool 14 is provided with a oriented convex notch groove 14a or a bellows hole, and when the neck screw 18 is loosened to release the screwing with the spacing bolt 6, the convex notch groove 14a of the attachment/detachment tool 14 is opened. Engage the small groove or small hole of the bellows hole with the neck 17 of the corresponding necked bushing 15, and press the attachment/detachment tool 14 to insert the connector, or pull up the attachment/detachment tool 14. A method for attaching and detaching a printed circuit board, characterized in that the connection of the connector is released.