JP4855375B2 - Box closing structure, closing method, and box - Google Patents

Description

The present invention relates to a closing structure of a resin housing for housing a box, particularly an electronic device.

A structure using a standing claw and a hook is often used as a resin box closing structure for storing electronic equipment.

However, the fixing structure using the hook structure is not recommended in an environment with high vibration such as an in-vehicle device because a problem such as the hook being detached due to vibration occurs.

For this problem, the following patent publication discloses a configuration in which the opening of the box is closed by a separate lid and fixed by screwing.
Japanese Patent Laid-Open No. 05-018407

According to Patent Document 1, it is possible to firmly fix a lid by inserting and installing a device inside a box and then fixing with a screw, for example, a configuration suitable for application to an on-vehicle device. It can be.

However, according to this method, after the installation of the device and the lid, the operation of rotating the box body and screwing the screwing portion toward the worker side repeatedly occurs, resulting in an increase in the number of steps.

Moreover, if it is set as the structure which screws from the product front so that rotation in operation | work may not be performed, a commercial property will be impaired by seeing a screw from the front.

This problem can be avoided by attaching a decorative panel that can conceal the screw when screwing from the front of the product. This method is a structure that is often used in the manufacture of electronic devices provided with a liquid crystal display panel.

In this case, a decorative panel is adopted in which the liquid crystal display unit is transmissive and the portions other than the liquid crystal display unit are non-transmissive.

By the way, the process of attaching the decorative panel after screw tightening may produce a defective product by attaching the decorative panel to the semi-finished product before screw tightening due to inadequate process control. is there. In addition, products with insufficiently tightened screws may be produced.

In this case, the function of the hook structure at the beginning of shipment allows a semi-finished product to flow out as if it is a normal product, and causes a failure or failure such as a panel coming off in the market. Dealing with defective products generated in the market requires a large amount of countermeasure costs compared to dealing with defective products in the process.

According to the present invention, even after the decorative panel is pasted, the reliable implementation of screwing can be visualized and the outflow of defective products can be prevented, and the frequency of outflow of defective products can be reduced by facilitating the detection of defective products, It contributes to price reduction.

The present invention proposes a box structure that can visualize the reliable implementation of screwing even after application of a decorative panel and prevent the outflow of defective products.

According to a first aspect of the present invention, there is provided a first housing having an opening and having a device built therein, and is fixed with screws from the front of the opening to close at least a part of the first housing. A box having a second housing and a decorative panel attached to the second housing from the outer surface and covering the screws, wherein the first and second housings are temporarily fixed to each other. Each of the second housing includes a claw and a standing claw receiving portion, and the second housing is formed with a seat so that the screw does not protrude from the surface of the second housing. A convex portion having a substantially truncated cone shape having a ridge line, and a concave portion for receiving the first housing in a shape substantially matching the substantially convex shape of the truncated cone shape of the second housing. At the time of the temporary fixing And a predetermined interval is provided between the convex portion and the concave portion, and at least one standing nail receiving portion of the temporary fixing is installed by a stress generated by setting the interval to 0 by fastening the screw. A box closing method is provided in which the presence or absence of screw fastening can be determined even after the decorative panel is pasted by floating upward.

According to a second aspect of the present invention, a first housing having an opening and having a device installed therein is fixed with a screw from the front of the opening to close at least a part of the first housing. A box having a second housing and a decorative panel that is attached to the second housing from the outer surface and covers the screw, and the first and second housings have a nail so as to temporarily fix each other. And the second housing is formed with a countersink so that the screw does not protrude from the surface of the second housing, and a substantially frustoconical shape on the back of the countersink The first housing has a recess that receives the convex projection substantially in the shape of the truncated cone of the second housing, and at the time of the temporary fixing, Convex part and concave part Box body which features are provided that a predetermined distance is provided between

According to a third aspect of the present invention, there is provided a box characterized in that the predetermined interval is approximately 0.3 mm.

According to the present invention, even after the decorative panel is pasted, the reliable implementation of screwing can be visualized and the outflow of defective products can be prevented, and the frequency of outflow of defective products can be reduced by facilitating the detection of defective products, It contributes to price reduction.

The configuration of the present invention is as follows.

An electronic device box according to an embodiment of the present invention includes a housing 1 and a housing 2 that are fitted to each other by a standing claw and a hook. Among them, the housing 1 is provided with standing claws, and the housing 2 is provided with hooks at positions and shapes corresponding to each other.

A housing 2 is fitted in a lid shape to a housing 1 in which predetermined electronic devices, for example, a backlight unit, an LCD, and an LCD control device are stored. At this time, the housings 1 and 2 are temporarily fixed by the standing claws provided in the housing 1 and the hooks provided in the housing 2.

In this embodiment, when the housing 1 and the housing 2 are fitted and combined, the size is approximately 180 mm × 60 mm × 60 mm, and the liquid crystal display element is attached to one of the surfaces of approximately 180 mm × 60 mm so that display is possible. It is supposed to be

The screw that fastens the housings 1 and 2 is located in the center of the surface in the short direction, the approximately 60 mm direction, of the surface on which the liquid crystal display element is observed and the decorative panel is attached.

In the case of the present embodiment, as shown in FIG. 4, the hooks 11 and 12 are temporarily fixed by the corresponding standing claws.

The thickness of the housing is 1.5 mm at the main part, and the height of the standing claws is 1.4 mm.

The screw fixing portion of the housing 2 is provided with a seat so that the screw does not protrude to the surface after fastening, and a substantially frustoconical convex portion is formed on the back surface of the seat.

The housing 1 is provided with a concave shape that receives a substantially frustoconical convex portion provided in the housing 2.

The angle of the ridge line of the convex part and the concave part is formed so as to form an angle of about 30 degrees when the screw axis is 0 degree, and the convex part and the concave part have the same angle.

If this angle is too large, it does not apply to the hypothesis of the principle described later, so it seems that the effective range is up to about 45 °.

Here, when the housings 1 and 2 are temporarily fixed by the standing claws and the hooks, the convex shape and the concave shape are such that the side surfaces provided with the ridge lines come into contact with each other, so that the housing 1 and the housing 2 can approach each other. Regulated to a predetermined size.

Since the approach between the housing 1 and the housing 2 is restricted, a gap having a predetermined dimension is generated between the upper part of the convex part and the bottom part of the concave part.

Next, the housing 2 is fastened to the housing 1 with screws through a screw fastening portion provided in the housing 2.

At the time of temporary fixing, there is a gap of a predetermined size, for example, 0.3 mm, between the upper part of the convex part and the bottom part of the concave part, but the screws are tightened until the gap becomes zero.

Then, as a result of fastening with the screw, the screw is centered with respect to the housing 2 through the substantially frustoconical convex portion on the lower surface of the seat 2 and the concave portion of the substantially frustoconical receiving portion provided in the housing 1. A tensile stress is generated.

The inventor of the present invention hypothesized that the housing 2 has an effect of lifting the tip portion provided with the hook of the housing 2 from the housing 1 by the principle of the lever with the corner portion 13 of the housing 1 as a fulcrum by the tensile stress.

This effect appears most significantly at a position far from the corner 10 of the housing 1, that is, at the hook 11 in FIG. On the other hand, the effect of lifting the housing 2 was not confirmed in the hook 12 portion in FIG.

When the clearance dimension between the convex part directly below the seating and the concave part is 0.3 mm, the lifting dimension of the hook 11 at the end of the housing 2 due to this phenomenon does not exceed the height of the standing claw, and the function of temporary fixing Was not compromised.

In consideration of process accuracy, it is considered that this gap dimension is effective in a range of about 0.3 mm ± 10%. Further, the ridge line angle of the convex portion and the concave portion is considered to be an appropriate angle of about 30 ° to 45 ° because the housing 2 cannot be effectively pulled if the angle is too large or too small.

In the above embodiment, the description is made assuming that the screw to be used is a round screw in order to simplify the description. However, an appropriate countersink shape, and the convex portion and the concave portion of the substantially truncated cone shape are formed. If this is the case, a flat screw other than a round screw, a square screw, or the like, or a nut is provided inside the bottom surface of the recess of the housing 1, or a nut is inserted into the bottom surface of the recess of the housing 1 to be fastened with bolts. It will be apparent to those skilled in the art that the effects of the present invention are effective even in such cases.

In the above embodiment, the hook 11 has a distance of about 60 mm with respect to the corner portion 10 of the housing 1. However, when the size of the box is larger, it is considered that the lifting amount increases. It is done.

For this reason, it is important to set the height of the standing claws provided in the housing 1 according to the distance between the corner and the hook.

If the other conditions are the same, the lifting height is considered to be proportional to the distance between the corner and the hook. Therefore, for example, when the distance is about 100 mm, the standing nail is 1.6 to 1.7 of the present embodiment. It is considered that a structure that does not impair the temporary fixing function can be obtained by setting the double size.

The housing of the present invention is assumed to be used for housing a liquid crystal display device having a backlight, but is not limited to this, and can be applied to containers for storing various electronic devices and the like. This will be readily understood by those skilled in the art.

It is an exploded view of one embodiment of the product of the present invention. It is a schematic diagram which shows the mode of the clearance gap before screw fastening. It is a schematic diagram which shows the mode of the clearance gap after screw fastening. It is a housing deformation | transformation schematic diagram before screw fastening. It is a housing deformation | transformation schematic diagram after screw fastening.

Explanation of symbols

1 Housing 1
2 Housing 2
10 box 11 hook 1
12 Hook 2
13 Corner of housing

Claims (3)

A first housing having an opening therein and having a device built therein; a second housing fixed with a screw from the front of the opening to close at least a part of the first housing; and the second housing A box provided with a decorative panel that covers the screws,
The first and second housings are each provided with either a raised nail or a raised nail receiving portion to temporarily fix each other,
The second housing is formed with a seat so that the screw does not protrude from the surface of the second housing, and a substantially frustoconical convex protrusion having a ridge line of a predetermined angle on the back surface of the seat. Have
The first housing includes a concave portion that is received in a shape substantially coinciding with the substantially frustoconical convex protrusion of the second housing;
A predetermined interval is provided between the convex portion and the concave portion at the time of the temporary fixing,
Due to the stress generated by the fastening of the screw, at least one of the temporarily fixed standing nail receiving portions floats outward from the installation position, so that it is possible to determine whether the screw is fastened even after the decorative panel is pasted. Method. A first housing having an opening therein and having a device built therein; a second housing fixed with a screw from the front of the opening to close at least a part of the first housing; and the second housing A box provided with a decorative panel that covers the screws,
The first and second housings are each provided with either a raised nail or a raised nail receiving portion to temporarily fix each other,
The second housing is formed with a seat so that the screw does not protrude from the surface of the second housing, and has a substantially frustoconical convex protrusion on the back surface of the seat.
The first housing includes a concave portion that is received in a shape substantially coinciding with the substantially frustoconical convex protrusion of the second housing;
A box having a predetermined distance between the convex portion and the concave portion at the time of the temporary fixing. The box according to claim 2, wherein the predetermined interval is approximately 0.3 mm.

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