JPS608468Y2 - Parts for cases of electronic devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electrical components, and more particularly to a printed circuit board frame (rack) into which a printed circuit board (card) mounted with electronic components can be inserted and fixed.

In recent years, for electrical control in automation, etc., control systems using electronic control members have been increasingly used instead of mechanical control members such as relays.

For this reason, printed circuit boards are used because it is necessary to mount a large number of electronic components, and because the control system of these printed circuit boards is complex and precision has increased, the number of printed circuit boards used is large, sometimes dozens. , it is no longer unusual for the number of copies to exceed several hundred.

In addition, the voltage used for the above control ranges from low voltage in mV to high pressure in kV, and circuits that handle the frequency range from direct current to high frequency in MHz or pulse waveforms are now mounted on printed circuit boards. Ta.

In addition, in recent years, as the mounting density of electronic components on printed circuit boards has increased, the amount of heat generated by printed circuit boards has also increased.

For the above reasons, in order to store a large number of printed circuit boards in a storage frame at high density without affecting each other, it is necessary to pay attention to the mounting positions of the printed circuit boards, especially the spacing between the boards.

However, many conventional board storage frames are provided in which guide rails for inserting printed circuit boards are evenly fixed to the frame by screws or eyelets.

However, in reality, the height of the mounting surface differs depending on the type of electronic component mounted on the printed circuit board (for example, the height of the mounting surface of an IC memory board and a power supply board differs by several times), so printed circuit boards are often There are cases where it is desired to change the spacing between boards, and there are cases where it is desirable to insert a shield plate between each board, but conventional printed circuit board storage frames have a problem in that the above-mentioned space cannot be freely changed.

This is because once the guide rail is attached, it cannot be easily removed.In particular, in order to reduce the number of installation steps, multiple tabs are installed on the guide rail instead of screws. With a guide rail of the type that is attached by fitting the tab into a small hole in a support member, it may be difficult to remove the guide rail depending on the length of the guide rail.

In addition, as shown in Figure 1, conventional board storage frames are fixed by passing guide rails for inserting printed circuit boards into the frame, so the upper and lower sides of the board are open, and harmful noise from the air is generated. There was also an influence from the upper and lower printed circuit boards, and in order to eliminate this influence, another shield plate had to be installed.

In this case, simply providing a shield plate will make it difficult to dissipate the heat generated by electronic components mounted on the printed circuit board, and the equipment and configuration will become complicated, such as requiring a separate ventilation fan for heat dissipation. There was a problem with the problem.

Also, if a shield plate is installed, there will be no upper and lower open parts, so
Depending on the printed circuit board, it may be difficult to connect a cable from the outside.

At this time, the cable wiring used for the connection will be laid between the printed circuit boards, and it will be necessary to clamp the cables in order to route the cable bundle in the narrow space between the printed circuit boards. The problem is that the space is too narrow to specifically provide a cable clamp, making it difficult to connect cables from the outside.

The present invention eliminates the above-mentioned drawbacks, and allows the interval between the guide rails in the printed circuit board storage frame to be changed freely according to the size of the printed circuit board mounting member and the height of the mounting surface. To provide a printed circuit board storage frame capable of shielding against noise and easily dissipating heat.

The gist of the present invention, which is distantly related to this purpose, is to provide elongated holes and a plurality of round holes as guide mounting holes for guiding the insertion of printed circuit boards into the board material that forms the upper and lower parts of the box that houses the electronic device. The present invention provides a member for a case of an electronic device, characterized in that the holes are arranged in the same line and pre-drilled, a plurality of rows are provided, and a plurality of holes are bored between the rows.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a conventional printed circuit board storage frame, in which band plates or angled guide mounting plates 2, 2' are attached by screws or welding between opposing side plates 1, 1'.

The best method is to attach the guide rails 3 for inserting a plurality of printed circuit boards by screwing them through pre-drilled holes or newly-drilled holes 4.

Next, a second embodiment of the printed circuit board storage frame according to the present invention will be described.
Illustrated in the figure.

The frame is attached to side plates 5, 5' constituting the frame by screwing or welding a lower plate 6 and an upper plate 6', which will be described later, to form a box body.

Further, FIG. 3 shows a lower plate 6 and an upper plate 6' to which guide rails for inserting printed circuit boards are attached.

In this figure, a top view and a side view are made of a material such as an iron plate or an aluminum plate, and the bending and perforation are done by press working.

In the drawing, there are three types of holes, and for mounting the guide rail, a plurality of round holes 6a, 7 and a long hole 8 are arranged on the same line. A plurality of round holes 6b having the same diameter as the round holes 6a are bored between the arrays.

Among these, a row of round holes 7 on the front side are holes for inserting mounting tabs of a guide rail (FIG. 4), which will be described later, and have a hole diameter suitable for fitting the tabs.

Note that the reason why the round hole 8 is a long hole is to provide an allowance for the dimension between the tabs of the guide rail.

Next, an example of a guide rail suitable for the above-mentioned mounting plate will be explained. In Fig. 4, there is a groove 10 in the upper side of a bar 9 made of nylon resin or the like with a square cross section, into which a printed circuit board is inserted. The groove 10 is made wide at its end 10b, as shown, so that a printed circuit board can be easily inserted therein.

Further, a circular tab 11 is integrally fixed to the lower part of the rod,
A groove 12 is provided in a part thereof, and an end part 11'
It has a round head shape for easy insertion into the hole.

Of course, the guide rail shown in FIG. 2 may also be used.

When using this printed circuit board storage frame, the above-mentioned lower plate 6 and upper plate 6' are each screwed or welded to the side plate 5' to form a box body, and then guided according to the height of the mounted printed circuit board. Select the installation spacing of the rails 9, and push the tabs 11 of the guide rail 9 into the holes 7 and 8 corresponding to the selected positions.The tabs 11 are inserted into the holes 7 and 8, and the thickness of the plate 6. The guide rails 9 are engaged with the lower plate or the upper plate.

As described above, according to the present invention, since a large number of guide rail mounting holes are opened at short intervals, the mounting width of the guide rail can be freely selected, and the printed circuit board can be stored in a rational manner.

Further, when attaching the guide rail to the upper and lower plates, the tabs of the guide rail are simply pushed in, which has the effect of reducing the number of steps required for attachment.

When removing a guide rail that is attached by pushing such a tab into a hole provided in the upper and lower plates, conventionally the end 11' of the tab 11 shown in FIG. When you remove the tab, the other tab may be broken, or you may not be able to push the tab 11, which has a rounded end 11', so you may not be able to push it off properly.
It was also considered that 1 could be damaged and could not be reused as a guide rail.

On the other hand, since the elongated hole 8 and the plurality of round holes 7 and 6a are arranged on the same line and are pre-drilled in the upper and lower plate materials as the case member according to the present invention, the guide rail 9
The guide rail 9 can be easily removed by pushing the guide rail 9 from the outside of the case with a rod with a thin tip, such as a lower lever, using the round hole 6a drilled on the back side of the case. This has the effect that there is less risk of damaging the 11.

At this time, the round holes 6a to be used do not need to be limited to those arranged on the same line as the long holes 8, and any round hole 6a or round hole 6b existing within the width of the guide rail 9 may be used. There is no problem.

Since the guide rail 9 has a groove 10 in the center,
It is also preferable to avoid the center and press the left and right shoulder areas where there is sufficient strength.

Furthermore, since guide rails for printed circuit boards can be installed directly on the members forming the box, electronic devices can be provided at low cost.

In addition, when stacking printed board storage frames above and below, if the mounting plate is made of conductive material, it also serves as a shield, so a separate shield plate is not required, and the large number of holes allows for heat dissipation through ventilation. There is an effect that can be expected.

Furthermore, as shown in FIG.
It also has the effect that it can be fixed with a cable band (binding band) using the round holes 6b between the guide rails 9 attached to the guide rails 6'.

As shown in the opening of FIG. 5, if the cable band has a head H sufficiently larger than the round hole 6b, the cable bundle 21 can be fixed without using a special fixing device, and the cable bundle 21 can be secured between the narrow printed circuit boards. It is also possible to lay cables in this space.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional printed circuit board storage frame, Fig. 2 is a partially cutaway perspective view showing a printed circuit board storage frame according to the present invention, and Fig. 3 is a perspective view of a printed circuit board forming part of the box. Lower plate to which the guide is attached, top view A and side view opening of the upper plate,
Figure 4 is a plan view, a front view, and an opening for explaining the guide.
A side view C and FIG. 5A are partially cutaway perspective views showing an example of fixing the cable bundle 21 by the binding band 22, and the opening in FIG. 5 is an explanatory view of the binding band 22. 1.1'...Side plate, 2,2'...Guide mounting plate, 3...Guide rail (guide), 4
...Guide mounting hole, 5, 5'...Side plate, 6,6'...Lower plate and upper plate, 8...
Guide mounting hole, 9... Square bar, 10...
・Printed board insertion groove, 11...Tab, 12...
...Locking groove.

Claims (1)

[Scope of utility model registration request] A long hole and a plurality of round holes are arranged in the same line and pre-drilled as guide mounting holes for guiding the insertion of a printed circuit board into the plate material forming the upper and lower parts of the box body that houses the electronic device. A member for a case of an electronic device, characterized in that the member is provided in rows and has a plurality of holes between the rows.