JPS5852717Y2 - drip-proof case - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a drip-proof case.

Electronic equipment, measuring equipment, and other devices that do not want moisture to enter are always accompanied by a waterproof or drip-proof case.

In this case, the purpose of the waterproof case can be achieved by using a backing.

However, if a removable cable or the like is attached to the device, an opening for guiding the cable must be provided in the case, so a completely waterproof structure using a backing is required. I can't.

Instead, such cases adopt a so-called drip-proof structure, provided that water or the like does not fall directly onto them.

For example, an electronic control device for an automobile is housed in the case with the opening and is attached to the wall in front of the driver's seat inside the vehicle.

Since this case is located inside the vehicle, it does not need to have a waterproof structure, but it must have a drip-proof structure against raindrops flying from the window or water droplets due to condensation inside the vehicle.

Conventionally, the case is limited to simply covering the electronic device;
The reality is that it does not have a completely drip-proof structure.

However, in cases used in harsh environments such as in automobiles, it is necessary to deal with the flying of various water droplets of unknown origin.

Therefore, an object of the present invention is to provide a drip-proof case with extremely high drip-proof effect.

In accordance with the above object, the present invention provides a drip-proof case that has a flat base that holds a drip-proof object and a bowl-shaped cap that encloses the drip-proof object together with the base. and an outer wall and an inner wall, and the cap is gripped so as to be sandwiched between these walls.

The present invention will be explained below according to the drawings.

FIG. 1 is a sectional view showing the structure of a conventional drip-proof case.

In this figure, 10 is a case, and a flat base 11
and a bowl-shaped cap 12.

The cap 12 and the base 11 integrally surround the object 13 to be drip-proofed.

A printed wiring board PT, which is an electronic device, and an electronic component group EP are shown as an example of the drip-proof target 13, and the printed wiring board PT is held on the base 11 via studs S.

Among the electronic components group, EP' indicates a connector, for example, and an external cable (
(not shown) and is removable.

Note that the case 10 is fixed to the mounting plate 14 via the base 11.

When the case 10 shown in FIG. 1 was arranged substantially horizontally as shown, the drip-proof effect was relatively good.

However, depending on the user's convenience, there is no guarantee that the case 10 will always be placed horizontally, and it may be placed vertically or slightly tilted forward or backward from the vertical.

If this type of installation is used, the drip-proof effect will be lost and water droplets will accumulate inside the cap.

Therefore, in the present invention, improvements were mainly made to the shape of the base, and when a prototype was produced and tested, it was confirmed that the drip-proof effect was dramatically improved.

FIG. 2 is an enlarged perspective view showing details of the structure of the improved base.

The improved base 21 in this figure has an outer wall portion 23 formed along its periphery, and an outer wall portion 23 that projects from the base 21 and is spaced inside the outer wall portion 23.
and an inner wall portion 24 formed substantially parallel to the inner wall portion 24 .

Furthermore, the outer wall portion 23 has drain holes 25 at predetermined portions, preferably on each of its four sides.

FIG. 3 is a sectional view showing a drip-proof case constructed by combining the base 21 of FIG. 2 and the cap.

As shown in this figure, the bowl-shaped cap 22 is sandwiched between an outer wall 23 and an inner wall 24 at its peripheral edge.

Regarding the parts attached to the case 30 in this figure, the same components as in FIG. 1 are indicated with the same reference numbers.

In addition, the cap 22 in FIG. 3 is the same as the cap 12 in FIG.
Some improvements have been made to the cap 12, in which the peripheral edge of the cap 12 is slightly bent outward, and a lip is formed at the peripheral edge of the opening OP.

However, these improvements are not the purpose of the present invention.

Note that it is assumed that the printed wiring board PT is held by the inner wall portion 24, for example.

How the thus obtained drip-proof case 30 exhibits its drip-proof effect will be clear with reference to FIGS. 4A, 4B, 4C, and 4D.

Note that in both figures, the hanging route of the water droplet is indicated by an arrow.

First, in FIG. 4A where the case 30 is horizontally arranged, the dripping route of the water droplets is as shown in the figure (note that the opening OP is simply covered (not shown) together with the cable, so Water droplets are formed in the groove between the outer wall portion 23 and the inner wall portion 24, without considering the intrusion from here (the same applies hereinafter).

However, since the water drain hole 25 is actually provided,
Water is drained from here.

A fourth case in which the case 30 is arranged tilting backward from the vertical.
In Figure B, the water droplets that have entered are prevented from entering the interior by the inner wall portion 24, and escape to the outside from the water drain hole 25 during their descent.

Further, water droplets that have reached the lowest end of the case are also drained to the outside from the water drain hole 25 in that part.

In FIG. 4C, where the case 30 is arranged vertically, the invading water droplets are blocked on the one hand by the outer wall 23 and do not intrude into the interior.

On the other hand, the water droplets may fall onto the upper surface of the cap 22.

In this case, it is necessary to taper the top surface (same for the bottom surface and both sides) in order to allow the liquid to flow downward from the top surface.

That is, the wall surface of the cap 22 is inclined with respect to the base 21 so as to form a trapezoidal shape.

In FIG. 4D, where the case 30 is arranged tilted forward with respect to the vertical, invading water droplets are completely blocked by the outer wall 23.

Even if water enters the drain hole 25 in the opposite direction, it will hang down along the inner wall 24 and enter the drain hole 25 at the lowest end.
more drained.

This drain hole 25 is not limited to a simple drainage function, but also has other functions.

That is, the drain hole 2 is located at the periphery of the cap 22.
If a claw portion is formed in a portion corresponding to 5 and can be detachably attached to the drain hole 25, the base 21 can also have a gripping function for the cap 22.

The claw portion and the drain hole 25 are not shown as long as they can be connected as male and female parts, and this is a well-known form of engagement.

As explained above, according to the present invention, a drip-proof case with high drip-proof effect is realized.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of a conventional drip-proof case, Fig. 2 is an enlarged perspective view of the base shown in Fig. 1 improved based on the present invention, and Fig. 3 is a cross-sectional view showing the structure of a conventional drip-proof case. 4A, 4B, 4C, and 4 are cross-sectional views showing the state in which the drip-proof case is configured.
Figure D is a diagram for explaining the drip-proof effect of the drip-proof case according to the present invention. In the figure, 13 is an object to be drip-proofed, 21 is a base, 22 is a cap, 23 is an outer wall part, 24 is an inner wall part, and 25 is a drain hole.

Claims (1)

[Scope of utility model registration request] 1. In a drip-proof case that includes a flat base that holds a drip-proof object and a bowl-shaped cap that surrounds the drip-proof object together with the base, the base is formed along the periphery of the base. The cap has an outer wall portion, and an inner wall portion that projects from the base and is formed substantially parallel to the outer wall portion at a distance inside the outer wall portion. The drip-proof case is gripped by the base so as to be sandwiched within a gap, and the outer wall portion has a plurality of drain holes. 2. The drip-proof case according to claim 1, in which the wall surface of the bowl-shaped cap is inclined in a trapezoidal shape with respect to the base. 3. The drip-proof case according to claim 1, wherein a claw portion that engages with the drain hole is provided on the peripheral edge of the bowl-shaped cap.