JPH0217497Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a housing for electronic equipment suitable for small communication devices and the like.

Structure of conventional example and its problems Figure 1 and Figure 2 A and B show the mounting structure of the lid of the conventional small communication device case.
In the figure, a large number of screws 3 are used to attach the lid of the casing 1 to separately attach the top lid 2a and the bottom lid 2b. In FIGS. 2A and 2B, the center of the top cover 2c or bottom cover 2d is screwed to the boss 5 of the housing body with one screw 4, respectively. In the structure shown in FIG. 1, the casing and the lid are fastened together with a large number of screws, so the contact between the two is good, but assembly and disassembly are troublesome. The structure shown in FIG. 2 is easy to assemble and disassemble because the lid is attached with a single screw, but it has the disadvantage that the periphery of the lid and the periphery of the casing are in poor contact. Another drawback was that if the screws were tightened strongly to improve contact, the center of the lid would become dented, making it unusable after repeated attempts.
In addition, in order to ensure good contact even when used again, it is necessary to add ribs to the lid and make the material thicker, so there is a need for something that is simple, lightweight, inexpensive, and has good contact. There is.

Purpose of the invention The present invention eliminates the drawbacks of the above conventional example and
By attaching two screws, the lid can be securely attached to the housing, and the lid and housing have good contact, and the housing has a simple structure and can be manufactured at low cost. This is what we provide.

Structure of the invention In order to achieve the above-mentioned object, the present invention provides a screw hole in the center of the upper or lower cover of the casing, and forms a gentle hill-shaped curved part with the upper side of the screw hole as the apex and descending to the surrounding area. By tightening the screw, the central curved part is pushed downward and changed into a flat shape, and the pressure is evenly transmitted to the periphery of the lid, and the elasticity of the hill-shaped area is used to spread the curved part around the lid and the casing. This is to ensure good contact between the parts.

DESCRIPTION OF EMBODIMENTS The structure of the casing of the present invention will be described below.
FIG. 3 shows an embodiment for realizing the present invention, in which 1 is a box-shaped casing having an opening in the vertical direction, 11 is a peripheral part of the casing 1, and lids 2, 3 are shown. It has a stepped shape in order to fit the housing 1 so that it does not slip from the housing 1. 13 is a post (boss) provided on the inner bottom 1a that electrically shields between the upper and lower parts of the housing 1; 14 is a hole for passing the mounting screw 4 provided in the center of the boss 13; be. 2 is an upper lid, 21 is a shallow convex curved portion toward the outside, 22 is a hole for the mounting screw 4, 23 is a peripheral portion of the lid, 24 is a recess that fills the head 4a of the mounting screw 4, and 3 is a concave portion that fills the head 4a of the mounting screw 4. Bottom cover, 31
32 is a boss similar to the top cover, 34 is a screw hole into which a mounting screw is screwed, 33 is a peripheral portion of the bottom cover, and 4 is a mounting screw.

Figure 4 is a cross-sectional view of the assembled housing.
The mounting screw 4 passes through the screw hole 22 of the top cover 2 and the boss hole 14 of the casing 1, and is screwed into the screw hole 34 of the boss 32 of the bottom cover 3. Tighten 1 at the same time. At this time, the gap 23 (distance=d) between the back surface of the recess 22 filling the screw head of the top cover and the top surface of the boss 13 of the casing becomes zero, and the top surface of the cover 2 becomes flat. Further, the lower surface of the boss 13 on the back surface of the inner sole 1a and the upper surface of the boss 32 on the bottom lid come into contact with each other, so that the bottom lid 3 also becomes flat. At this time, the gentle ridges of the top and bottom lids act as springs to connect the peripheries of both lids and the casing under pressure, resulting in stable contact.

Here, the gentle hill portions 21 and 31 will be explained in detail. The gentle hill portion has a hill shape with a low height h that is 1/200 of the major axis D when the top or bottom surface of each lid is a flat surface. That is, for a diameter of 140 mm, h≈d, that is, a hill height of 0.7 mm is given. The shape of this hill may be circular, or may have a shape similar to the plane of the casing. For example, if the casing is square, it may be a gentle rectangular hill slightly smaller than the plane of the casing, as shown in FIG. 3D. This gentle hill allows the pressure of the screw to be evenly transmitted to the surrounding area, and when the lid is screwed down, the top or bottom surface of the lid is nearly flat, and its restoring force applies pressure to the surrounding area. be. The gently ridged portion may be shaped like die casting, or the flat lid may be formed with a gently ridged shape by press working.

Note that the contact between the lid periphery and the casing may be elastically embedded in the edge of the casing to satisfy both electrical contact and airtightness.

The above shows an example in which the top cover 2 and bottom cover 3 are attached to the housing with one screw, but they may also be attached to the boss from the top and bottom using two screws, as shown in Figure 5. .

Effects of the invention The present invention has the above-mentioned configuration, and provides the following effects.

(a) The lid of the casing can be easily attached and removed by screwing, and reliable electrical contact can be made between the casing and the lid by utilizing the elastic deformation of the curved part provided in the center of the lid. It will be done.

(b) When screwing, the curved portion is pushed inward and the surface of the lid is kept substantially flat, so the aesthetic appearance is not impaired and the lid can be fixed with a simple structure.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the configuration of a conventional electronic device casing, Fig. 2 A and B are perspective views and sectional views showing other conventional examples, and Fig. 3 A to D are an embodiment of the present invention. An exploded perspective view, a sectional view, and a perspective view showing the other side of the lid for explaining the configuration of the electronic device casing,
FIG. 4 is a sectional view of the central part of the housing, and FIG. 5 is a sectional view showing the configuration of another embodiment of the present invention. 1...Housing, 2...Top lid, 4...Mounting screw, 1
3...boss, 21...gentle hill, 23...gap.

Claims (1)

[Scope of utility model registration request] A casing body having an opening on at least one surface in the vertical direction, and a peripheral part that fits into the opening of the casing main body, and the central part has a slightly higher height toward the outside of the opening than the peripheral part. A lid made of a resilient metal material, which has a swollen hill part and has a screw hole in the central part, and a lid that is fixed inside the housing body and screws through the lid through the hole in the central part. A gap is provided between a support for fixing the support and the tip of the support and the inside of the screw hole of the lid, and the gap is approximately the same as the minute height, and the lid is attached to the support through the screw hole with a screw. A casing for an electronic device that is tightened and fixed until the gap disappears.