JPH0442994A - Printed board cover and mounting structure of cover - Google Patents

Abstract

PURPOSE:To obtain a cover having high universality, a low cost, easy maintenance and inspection by cutting or bending a cover material along the stripe of a V-shaped groove to form a cover in a box shape opened at one surface, and mounting the opening end of the cover in contact with the peripheral edge of a printed board mounting surface. CONSTITUTION:V-shaped grooves 15 are formed in a lattice state on one side surface of synthetic resin plate, and a cover material of a large size is provided. The material is cut along the stripe of the selected groove 15, then folded, and a cover 10 of box shape opened at one surface is provided. The opening end of the cover 10 is mounted in close contact with the peripheral edge of the mounting surface of a printed board 4. The pitch of the grooves 15 formed in the lattice state on the board is desirably 2.54 mm. Fittings 20 made of synthetic resin having a body 21 in an L shape as seen in plane, an L-shaped groove 22 formed at the body 21 so as to open at the upper and side surfaces, and a plug 25 protruding on the bottom of the body 21 to be mounted in the hole of the board are provided.

Description

[Detailed Description of the Invention] [Summary] Printed board covers and cover attachment are related to structure, and the purpose of the present invention is to provide a versatile and low-cost cover, and to provide a cover attachment that is easy to maintain and inspect. For the purpose of As a result, the cover is configured in a box shape with one side open, and the open end surface of the cover is attached closely to the peripheral edge of the mounting surface of the printed board. The main body has a shape in plan view, an L-shaped groove is formed in the main body so that the upper and side surfaces are open, and a plug projects from the bottom of the main body and is inserted into a hole in a printed board. The fixtures made of synthetic resin are attached to each of the four corners of the printed board, and the corners of the side walls of the cover are inserted into and removed from the corresponding L-shaped grooves of the fixtures.

[Industrial application field]

The present invention relates to printed circuit board covers and cover attachment structures.

BACKGROUND OF THE INVENTION Electronic equipment such as electronic exchanges uses electronic devices in which a large number of printed boards are housed on a shelf.

By the way, the subscriber circuit printed board for accommodating subscribers of such electronic devices has been enlarged to accommodate multiple lines (8 lines).
If it were to be implemented, the entire large printed circuit board on which eight circuits were mounted would have to be replaced due to a failure of one circuit due to a lightning surge or the like.

Therefore, in recent years, as shown in Figure 4, 1 printed board 1
By using a small printed circuit board for the circuit, a faulty printed circuit board can be replaced without being affected by the status of other circuits.

In FIG. 4, 1 indicates several printed boards 3 for external connection.
This is a box-shaped shelf that accommodates in parallel a large number of small printed boards 4 for one line of l printed boards constituting a subscriber circuit.

A connector (not shown) into which the printed board 3 for external connection is plugged, and the printed board 4 are installed on the bottom surface of the shelf 1.
A backboard 2 with a multilayer structure is attached, which is provided with a connector (not shown) for plug-in.

Then, a line lead-in connector is mounted on the front edge of the external connection printed board 3, and the external line is connected to the printed board 4 via the external connection printed board 3 - backboard connector, backboard 2 - backboard connector. are doing.

However, as printed boards have become smaller as described above, it has become cumbersome to handle them by gripping only the edges with both hands, and there is a tendency to grip both sides of the printed board with one hand.

This may cause your fingers to touch circuit parts with weak dielectric strength (
If you touch a metal oxide semiconductor device (for example, a metal oxide semiconductor device), the circuit components may be destroyed due to electrostatic discharge between the static charge accumulated in the human body and the static charge accumulated in the printed circuit board.

Further, when the printed board is stored, there is a risk that the circuit components may be hit by other objects and damaged.

Therefore, it is desired to attach a cover to a printed board.

[Conventional technology]

Conventionally, a cover as shown in FIG. 5 has been used.

In FIG. 5, 6 is a synthetic resin (for example, ABS resin)
It consists of a ceiling board 61 whose shape is almost the same as the mounting surface shape of the printed board, and a pair of front and rear side walls 62 provided at the four side edges of the ceiling board 61. The cover is made up of a pair of left and right side walls 63.

That is, the cover 6 is molded into a shallow box shape with an open surface facing the ceiling plate 61.

Note that the depth of the cover 6 is greater than the height of the circuit components mounted on the printed board.

Such a cover 6 is attached to the printed board by aligning the open end surface with the peripheral edge of the mounting surface of the printed board and fixing it using an adhesive.

[Problem to be solved by the invention]

However, the conventional cover described above has a shape of a printed board,
There is also a problem in that a mold must be manufactured each time the mounting height of the circuit components differs, which increases the manufacturing cost of the cover.

In addition, since it is fixed to the printed board using adhesive,
There were problems in that it was difficult to remove the cover and maintenance and inspection of the mounted circuit components was troublesome.

The present invention was created in view of these points, and an object of the present invention is to provide a low-cost cover that is versatile.

Another purpose is to provide a cover installation structure that is easy to maintain and inspect.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a large-sized cover blank plate in which V-grooves 15 are formed in a lattice pattern on one side of a synthetic resin plate, as illustrated in FIG.

A cover blank is cut along the groove lines of the selected V-groove 15 and then bent to form a box-shaped cover 10 with one side open.
will be established.

The open end surface of the cover 10 is attached closely to the peripheral edge of the mounting surface of the printed circuit board 4.

Note that the pitch of the V grooves 15 formed in a lattice shape on the cover blank plate is preferably 2.54 mm.

In addition, as illustrated in FIG. 3, the main body 2 in plan view
1, an L-shaped groove 22 formed in the main body 21 so that the upper and side surfaces are open, and a plug 25 that protrudes from the bottom of the main body 21 and is inserted into a hole in a printed board. A fitting 20 is provided.

Then, attach these fixtures 20 to each of the four corners of the printed board, and attach the corners of the side wall of the cover 10 to the corresponding fixtures 20.
By inserting and removing the cover 10 into the L-shaped groove 22 of the
The structure is such that it is attached to a printed board.

[Effect]

The large cover blank plate is provided with V grooves 15 in a grid pattern.

Therefore, it is easy to cut out the plate members connected to the front and rear side walls and the left and right side walls at the four side edges of the ceiling plate having desired dimensions. Then, by bending the front and rear side walls and the left and right side walls along the groove lines of the V-groove 15, a box-shaped cover with a desired shape can be formed.

That is, the cover according to the present invention is highly versatile and inexpensive.

Further, holes are provided at the four corners of the printed board, and the cover is attached to the printed board 4 by pushing the corners of the side walls of the cover into the L-shaped grooves of the fixtures inserted into the holes.

Therefore, the cover can be attached and detached freely, making it easy to maintain and inspect the circuit components mounted on the printed board.

〔Example〕

The present invention will be specifically described below with reference to the drawings. Note that the same reference numerals indicate the same objects throughout the figures.

FIG. 1 is a perspective view of an embodiment of the first invention, FIG. 2 is a view of a cover blank, (a) is a perspective view, (b) is a sectional view, and FIG. 3 is a diagram showing main points of the third invention. (a) is a perspective view, and (c) is a perspective view of the fixture.

In FIG. 1, a large number of circuit components 5 of several types having different shapes and mounting heights are mounted on the surface of a rectangular printed board 4.

10 consists of a ceiling board 11 that covers the mounting surface of this printed board 4, front and rear side walls 12 provided on a pair of side edges of the ceiling board 11, and a pair of left and right side walls 13 provided on the other pair of side edges. It is a shallow box-shaped cover made of synthetic resin that is open on the side facing the ceiling plate 11.

The cover 10 is made by appropriately cutting and bending the cover plate 100 shown in FIG. 2 along the groove lines of the selected grooves 15 into a box shape.

In FIG. 2, the cover base plate 100 is a large flat plate made of synthetic resin (for example, ABS resin), and has grooves 15 formed vertically and horizontally in a grid pattern on the surface thereof.

The pitch P of V71115 can be any length without any problem.

However, taking into account that the plane dimension of the printed board 4 is an integral multiple of 2.54 m, this pitch P is 2.5 m.
4- is desirable.

The cover blank 100 as described above has a V-groove 15 on its surface, so that a large number of truncated pyramids 1ε are arranged on the surface.

In addition, the thickness of the cover base plate 100 is approximately 2-
The top of the groove and the back of the cover blank (the outside surface of the cover)
The thickness t of the portion ① is approximately 0.3 mm so that the cover base plate can be bent along the groove lines of the groove 15.

In addition, when assembling into a box shape by folding the truncated pyramid 16 on the inside, if the apex angle α of the groove 15 is 90 degrees or more, there will be no problem in assembly; preferable.

This is because when folded, the opposing slopes of adjacent truncated pyramids are in close contact with each other, and the ceiling board and side walls or adjacent side walls form a right angle.

Further, unlike the cover shown in FIG. 1, when the truncated pyramid 16 is placed on the outside, there is no restriction on the apex angle α of the V-groove 15.

To make the cover 10 from the cover blank 100, first
It was cut along the thick line groove shown in the drawing, and was connected to a rectangular ceiling board 11, a pair of rectangular front and rear side walls 12 connected to a pair of side edges of the ceiling board 11, and another pair of side edges. A development plate consisting of a pair of rectangular left and right side walls 13 is cut out.

Then, the front and rear side walls 1 are placed along the grooves on the four side edges of the ceiling board 11.
2. By bending the left and right side walls 13 at right angles, a box-shaped cover 10 as shown in FIG. 1 is obtained.

Note that the size of the ceiling plate 11 of the cover 10 is the same as that of the printed board 4.
The height of the front and rear side walls 12 and the left and right side walls 13 is larger than the mounting height of the circuit component 5.

The above-mentioned cover 10 may have its open end surface fixed to the peripheral edge of the mounting surface of the printed board 4 using an adhesive, but it is also possible to attach the cover 10 to the printed board 4 using a fixture as shown in FIG. This has the advantage that the cover can be attached and detached freely, making maintenance and inspection of the circuit components 5 easier.

In FIG. 3, reference numeral 20 denotes a fitting made of elastic synthetic resin.

The fixture 20 is composed of a main body 21 in plan view that holds the cover 10, and a plug 25 protruding from the bottom surface of the main body 21 for fixing the fixture 20 to a printed board.

The main body portion 21 is provided with an L-shaped groove 22 that is L-shaped in plan view and has an open upper and side surface. The width of this L-shaped groove 22 is approximately equal to the thickness of the side wall of the cover.

Then, in each hole drilled in the four corners of the printed board,
The four fixtures 20 are fixed to the mounting surface of the printed board by press-fitting the plugs 25 into each one.

Thereafter, the cover 10 is attached to the printed board by pushing the side wall portions of the four opening corners of the cover 10 into the L-shaped grooves 22 of the respective fixtures 20.

〔Effect of the invention〕

As explained above, the present invention can be easily manufactured manually from a large cover blank according to the shape of the printed board and the mounting height of circuit components, and the cover blank can be manufactured from the same molding die. Since it is a manufactured product, it is highly versatile and has excellent practical effects at low cost.

Further, since the cover mounting structure of the present invention allows the cover to be attached and detached freely, there is an effect that maintenance and inspection of the circuit components mounted on the printed board are easy.

Fig. 3 is a diagram showing the main points of the third invention, (aJ is a perspective view, (c) is a perspective view of a fixture, Fig. 4 is a perspective view of an electronic device, and Fig. 5 is a perspective view of a conventional example. It is a diagram.

In the figure, 4 is a printed board, 5 is a circuit component, 6.10 is a cover, 100 is a cover base plate, 11 is a ceiling board,
Reference numeral 12 indicates front and rear side walls, 13 indicates left and right side walls, 15 indicates a groove, 16 indicates a truncated pyramid, 2o indicates a fixture, 21 indicates a main body, 22 indicates an L-shaped groove, and 25 indicates a plug.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the embodiment of the first invention, Fig. 2 is a view of the cover blank, (a) is a perspective view, (a) is a sectional view, 10 covers 10 covers No. 77T of the third invention Hill showing Figure 1 Closed Figure 100 Cover t (Reverse (α) Cb) Figure of the cover blank Figure 4 Perspective view of conventional example Closed 5

Claims (3)

[Claims] (1) The cover blank plate has V grooves (15) formed in a grid pattern on one side of a synthetic resin plate, and the cover blank plate is cut along the groove lines of the selected V grooves (15). By folding and bending, the cover (10) is formed into a box shape with one side open, and the open end surface of the cover (10) is configured to be attached closely to the peripheral edge of the mounting surface of the printed board (4). A printed board cover characterized by: (2) The printed board cover according to claim 1, wherein the pitch of the V-grooves (15) formed in a lattice shape on the cover blank is 2.54 mm. (3) An L-shaped main body (21) in plan view, and an L-shaped groove (2
2), and a plug (25) that protrudes from the bottom of the main body (21) and is inserted into a hole in the printed board. Fixtures (20) made of synthetic resin are attached to the four corners of the printed board. A cover characterized in that the corner of the side wall of the cover (10) according to claim 1 is inserted into and removed from the corresponding L-shaped groove (22) of the corresponding fixture (20). installation structure.