JPH0385798A - Printed board mounting case and printed board fixing device - Google Patents

Abstract

PURPOSE:To facilitate putting a printed board into and pulling it out of a printed board mounting case and to surely fix the mounted printed board by enclosing a front opening of a mounting case with a plurality of front boards while providing the respective front boards with conductive tongue pieces to be suppressed by the members neighboring thereto. CONSTITUTION:Front boards 11 (11a to 11c) enclosing a front opening 2 of a mounting case are mounted on printed boards 9 (9a to 9c) to be mounted on the mounting case 1 respectively. Further, the front boards 11, on which the printed boards are mounted, are fixed by means of a fixing device. Each front board 11 has bent parts 12, 15 on its four sides while being provided with conductive tongue pieces 14, 16 to be suppressed to the front opening edges of the neighboring front boards or of the mounting board on the outer sides of the bent parts. Falling of the neighboring printed boards when a part of the printed boards is pulled out, can be prevented by providing the front boards with engagement pieces 18 to be engaged with the neighboring front boards and the front opening edges 3 of the mounting case.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a printed board mounting case that accommodates a plurality of printed boards in an electromagnetically shielded state, and a fixing device for the accommodated printed boards.

(Prior Art) A printed board mounting case with an electromagnetic shielding structure is shaped like a case made of sheet metal and has a front opening for inserting a printed board. This printed board mounting case is equipped with a motherboard on its back surface and a printed board guide on its inner side surface, and a plurality of printed boards inserted through the front opening are connected and mounted using the motherboard connector. Conventionally, a structure has been adopted in which a printed board is mounted and then a cover plate is fixed to the front opening with screws or the like.

(Problem to be solved by the invention) Mounted printed circuit boards may need to be inserted and removed for equipment maintenance and specification changes.Especially in electronic computers, it is often necessary to add additional memory boards and I10 boards. When such a need arises, with conventional equipment, it is necessary to remove the cover plate of the printed board mounting case, replace or add the specified printed board, and fix the M board again. In addition, with the conventional structure, when the lid plate is closed, it is impossible to see what type of printed board is mounted, and the printed board must be pulled out to confirm the type of printed board mounted. , there was a problem that it was difficult to discover the implementation ξ.

An object of the present invention is to provide a printed board mounting case and a printed board fixing device that can easily insert and remove a printed board into the printed board mounting case and that can securely fix the mounted printed board. It is said that

(Means for Solving the Problems) In the present invention, the printed board 9 (9
The same applies to a to 9C1 and below. ), or by fixing the front plate 11 on which the printed board is attached with a fixing device, the above Solving problems. The front plate 11 attached to each printed board 9 is a rectangular plate large enough to cover the front surface of the area occupied by the printed board in the actual device 1, when all the printable boards that can be mounted are mounted. Then, the front opening 2 of the actual device 1 is completely closed. If a part of the printed board is not mounted, a synthetic resin board of the same shape (hereinafter referred to as "
It's called a dummy board. ) is prepared, a front plate corresponding to the short plate is attached and loaded into the actual device 1.

Each front plate 11 has bent portions 12.15 on its four sides,
Conductive tongue pieces 14 and 16 are provided on the outer surface of the bending portion and are pressed against the adjacent front plate or the front opening edge of the actual device. Falling off of adjacent printed boards when a part of the printed boards is removed can be prevented by providing an engaging piece 18 on the front plate 11 and locking it to the adjacent front plate or the front opening edge 3 of the actual device.

The printed board fixing device has a U-shaped groove 7 formed in the opening edge of the printed board mounting case, and a lever 22 having a claw 23 that is fitted into the U-shaped groove is pivoted to the front plate 11 on which the printed board is mounted. A locking mechanism 21, 26 is provided to prevent the claw 23 fitted into the U-shaped groove from coming off.

(Function) When the printed board 9 is inserted into the actual device 1, its front board 11
The front opening 2 of the actual device is closed one after another, and when the mounting of a predetermined printed board 9 is completed, the front opening 2 of the actual device is completely closed. Further, a desired printed board can be pulled out in that state.

When the printed board 9 is mounted on the actual device 1, the front plate 11 of each printed board is fitted into the front opening 2 of the actual device in a mosaic pattern, so each front plate indicates the type of printing board to which it is fixed. By providing indications, patterns, etc., the mounting state of the printed board can be determined at a glance.

Each front plate 11 faces the adjacent front plate or opening edge 3 at bent portions 2.15 on its four sides, and the conductive tongue piece 14.16 provided at this bent portion is pressed against the opposing member. Therefore, electrical continuity is ensured between the front plates and between the front plate and the actual device, and by grounding a part of the actual device, a complete electromagnetic shielding effect can be obtained.

In addition, by providing an engaging piece 18 on each front plate 11 and locking it to the adjacent front plate or the front opening edge 3 of the actual device, each printed board 9 is supported by the front plate 11 and the connector 10 of the motherboard. You can also.

When mounting a printed board, the hook 2 of the lever pivoted on the front board
6 is engaged with the locking portion 21, so that the printed board is securely fixed. Moreover, the completion of the insertion operation of the printed board can be visually confirmed by the locking operation of the hook 26. When removing the printed board, the fixing of the printed board can be released by simply holding the swinging piece 25 of the lever.

(Example) Embodiments will be described below based on drawings showing examples.

The mounting case 1 shown in FIGS. 1 and 2 has a rectangular front opening 2, and the long side of the opening edge 3 has a case side plate
A low circumferential wall surface 5 is formed by once bending inward and then outward in a U-shape. Moreover, a U-shaped groove 7 is formed on the short side by once bending the housing end plate 6 outward and then bending it inward into a U-shape. Also, wife board 6
A slit 8 for accommodating a refracting piece 15 of the front plate, which will be described later, is formed at the front edge of the front plate. As shown in FIG. 3, six printed boards 9a, 9b, and 9C (hereinafter, when generically referred to, six printed boards 9a, 9b, and 9C having different width dimensions) are mounted in this mounting case 1, as shown in FIG.

The printed boards 9b and 9c have widths twice and three times larger, respectively, than the unit width of the printed board 9a. 1
0 is a connector of the motherboard, and each printed board 9 is supported by a connector 10 at its rear side.

At the front edge of each printed board 9, front plates 11a, 11b, 1
1C (hereinafter, subscripts will be omitted when generically referred to) are each fixed, and when these are mounted, the front of the mounting case 1 will look like the one shown in FIG. 4, and the front edge side of each printed board 9 will be , supported by the front plate 11.

The front plate 11 is all equal in width direction, and has a U-shaped cross section with its longitudinal edge bent outward. Opening windows 13 are provided at appropriate intervals on the bending wall 12, and the opening windows 13 are A conductive tongue piece 14 made of a conductive foil plate with one end welded to the inside is formed into a dogleg shape and protrudes to the outside of the opening window 13. The opening window 13 and the conductive tongue piece 14 are provided at alternate left and right positions.

The end shape of the front plate is different between the unit width type Ila and the triple width type 110. The end shape of the unit width member 112 is shown in FIGS. 5 and 6. A refraction piece 15 bent inward is formed at the end, and this refraction piece 1
The width m of No. 5 is slightly wider than half the width M of the front plate. Further, the width n of the throat portion 17 of this refracting piece is slightly narrower than half the width M of the front plate. The refracting pieces 15 are provided on one side of the front plate 11 in the width direction, with both ends thereof being biased in alternate directions. This refraction piece 15 is provided with a dogleg-shaped conductive tongue piece 16 whose one end is fixed to the tip of the outer surface of the refraction piece 15 .

Figure 7.8 shows the state in which the adjacent front plates (subscripts A and B are attached to each) at this end are engaged with each other. throat 17
Parts wider than A and 17B (engaging pieces) 18A and 18
B are connected by mutual engagement, and at this time, the end edge 19 of the front plate where the conductive tongue pieces 16A and 16B provided on the refracting piece face each other
B, oppressed by 19A.

FIGS. 9 to 11 show the shape of the end of the triple-width front plate 11C and the printed board fixing device. A bending piece 15 having the same bottom width as the front plate 11 is provided at the end of the triple-width front plate facing inward, and a conductive tongue piece 16 is attached to this bending piece 15. On the other hand, the printed board fixing device forms a U-shaped groove 7 shown in the second figure in the mounting housing ↓, and
The longitudinal bending wall 12 is once bent inward and then bent outward to form a support bracket 12a, and a pin hole 20 is provided at the tip of the support bracket 12a, and a notch 27 of the lever 22 shown in FIG.
This structure is such that the lever 22 is pivotally attached by fitting it into the support bracket 12a and inserting the fulcrum pin 28 into the pin hole 20.

The lever 22 is provided with a claw 23 at the base end, and a swinging piece 25 is integrally formed at the middle part via a flexible part 24.
A hook 26 is formed at the base end of 5. The pawl 23 is provided at a position where it is inserted into the U-shaped groove 7 of the packaging housing when the printed board 9C is inserted into the packaging housing 1 and the lever 22 is rotated inward (see FIG. 12). At this time, the hook 26 engages with a locking shaft 21 installed below the support bracket 12a. In this state, the lever 22 is prevented from rotating outward by the hook 26 (see FIG. 13). When removing the printed board 9c, the tip of the lever 22 is pinched together with the swinging piece 25, the swinging piece 25 is swung, the hook 26 is removed, and the lever 22 is rotated outward.

At this time, the pawl 23 pushes the back surface 7a of the U-shaped groove as the lever 22 rotates, and uses a lever action to pull out the pudding plate 9c from the motherboard connector 10 (see FIG. 14).

The bending piece 15 at the end of the front plate 11C is inserted into the slit 8 at the front edge of the end plate when the printed board 9C is loaded, and the conductive tongue piece 16 is pressed against the mounting case 1 (see FIG. 13).

The same applies when the refracting piece 15 of the front plate 11a having a unit width is adjacent to the opening edge 3.

One end of the double-width front plate 11 has the same structure as the single-width front plate 11a, and the other end has the same structure as the triple-width front plate 11a.
It has the same structure as c. Further, the parallel front edge plates or the front edge plate and the peripheral wall surface 5 of the opening edge are electrically connected by a conductive tongue piece 14 provided on the bending wall 12.

Any of the plurality of printed boards 9 mounted in this way as shown in Figure 3.4 can be pulled out as is, and even if some of the printed boards 9 are pulled out, the remaining front boards remain in their positions. Hold.

(Effects of the Invention) As explained above, according to the present invention, the work of inserting and removing a printed circuit board into and from a mounting housing becomes extremely easy, and there is no need to attach and remove the cover plate of the mounting housing when inserting and removing a printed board. This does not reduce the electromagnetic shielding effect. Furthermore, it becomes possible to identify the type of printed circuit board mounted just by looking at the front of the mounting case, making it easier to discover mounting errors. Furthermore, since the printed board can be reliably fixed to the mounting housing by the fixing device, it is possible to completely prevent the printed board from falling off.

[Brief explanation of drawings]

1 to 8 show the printed board mounting case of the present invention, FIG. 1 is a perspective view of the printed board mounting case, FIG. 2 is a cross-sectional view of the main part of the printed board mounting case, and FIG. 3 is a perspective view of the printed board mounting case. 4 is a diagram showing the state in which the printed board is mounted, FIG. 4 is a diagram showing the closed state of the front opening, FIG. 5 is a sectional view of the front plate of unit width, and FIG. 6 is a plan view of the front plate of unit width. , FIG. 7 is a perspective view showing the locking operation, and FIG. 8 is a front view showing the locked state. Figures 9 to 14 show the printed board fixing device of the present invention, where Figure 9 is a sectional view of the main part of a triple width front plate, and Figure 10 is a plan view of the triple width front plate. , FIG. 11 is a perspective view of the lever, and FIGS. 12 to 14 are explanatory diagrams showing the operation of the lever. In the figure, 1: Mounting case 2: Front opening 3: Opening edge 7: U-shaped groove 9 Niblint plate 11: Front plate 12: Refraction wall 14: Conductive tongue piece 15: Refraction piece 16: Conductive tongue piece 21: Locking shaft
22 Nilever 23: Claw 25: Swing piece 2
6: Hook

Claims (4)

[Claims] (1) In a printed board mounting case that accommodates multiple printed boards in an electromagnetically shielded state, the printed boards (9
The printed board is mounted on the front edge of the mounting housing (a, 9b, 9c).
1) A rectangular front plate (11a, 11b, 11c) of a size that covers the front opening of the area occupied within is fixed,
The front opening (2) of the mounting case (1) is connected to this front plate (11a,
11b, 11c), and each front plate has a conductive tongue piece (14, 16) that is pressed against the adjacent member.
A printed board mounting enclosure that is equipped with a. (2) Each front plate (11a, 11b, 11c) has bent portions (12, 15) on its four sides, and the conductive tongue pieces (14, 16) are provided on the outer surface of the bent portion. 2. The printed board mounting case according to claim 1, further comprising a printed board mounting case. (3) One front plate and the adjacent front plate are connected by engagement of the adjacent engagement pieces (18);
The printed board mounting case according to claim 1 or 2. (4) A U-shaped groove (7) open to the opening side is formed at the longitudinal end of the opening edge (3) of the printed board mounting housing,
The front plate (11) on which the printed board is mounted has a lever (25) equipped with a swinging piece (25) at the longitudinal end opposite to the opening edge.
22) is pivotally mounted, and a locking member (21) is provided, and the proximal end of the lever (22) is provided with a pawl (23) that is fitted into the U-shaped groove (7). A hook (26) that engages with the locking member (21) is provided at the base end of the hook (26). Sometimes the rocking piece engages due to its elasticity, and the engagement is caused by a claw (
lever (22) in the direction in which the lever (23) separates from the U-shaped groove (7).
) A printed board fixing device characterized by preventing swinging of the board.