JP2577895Y2 - Waterproof case structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case having a waterproof structure.

[0002]

2. Description of the Related Art Waterproofing is sometimes required in the case of various kinds of electronic equipment. In particular, remote controllers such as construction machines, machine tools, and radio control models are used under severe outdoor environments. Therefore, there are various specification requirements such as waterproofing, dustproofing and heat resistance. FIG. 4 is a sectional view of a conventional waterproof case structure. The case is composed of an upper case 41 and a lower case 42. A waterproof rubber packing 43 is sandwiched between the upper case 41 and the lower case 42, and the upper and lower cases 41, 42 are fitted together by fastening together with screws 44. The upper case 41 has a foot 45 facing the inside of the case.
Is formed, and a board 47 on which electric parts including a switch 46 are mounted on the foot 45 is fixed by screws 48.
An opening 49 is formed at a position of the upper case 41 facing the switch 46, and a rubber button 50 for pressing the switch 46 is provided so as to be exposed to the outside from the opening 49. The rubber button 50 is wider than the opening 49 and the upper case 4
It is formed thicker than the space formed by the substrate 1 and the substrate 47. A through-hole 51 is formed at the end of the rubber button 50, and the foot 45 of the upper case 41 is inserted into the through-hole 51 so that the upper case 4
Rubber button 50 is fixed to the case by being sandwiched between 1 and substrate 47.

Therefore, according to this structure, the upper and lower cases 41,
A packing 43 is provided at the fitting point of 42, and the opening 49 of the upper case 41 is pressed against the inner surface of the upper case 41 by the rubber button 50 by the substrate 47, so that the inside of the case is sealed and waterproof and dustproof are achieved. .

[0004]

The above-mentioned conventional waterproof case structure has a considerable effect on dust protection, but still has a problem in terms of waterproofness. That is, the path through which water enters is the contact surface between the upper case 41 and the rubber button 50, and the upper and lower cases 41 and 4.
There are three paths of the contact surfaces 52 and 53 between 2 and the packing 43, and the area of the path is large. Therefore, there is a possibility that water enters the inside of the case from here due to the capillary phenomenon. An object of the present invention is to provide a case in which the inundation path is reduced or the area thereof is reduced to reduce the inundation.

[0005]

In order to achieve the above object, the present invention provides a first case having an opening through which an elastic button is exposed, a second case fitted with the first case, A waterproof seal provided to be exposed to the outside from the opening
In a waterproof case structure comprising a G-shaped elastic button and a waterproof packing portion provided at a place where the first and second cases are fitted, the elastic button and the waterproof packing are integrated via a connecting portion, The waterproof case structure is characterized in that the inner surface of the first case is covered with the elastic button and the waterproof packing.

Further, the present invention is the waterproof case structure described above, wherein a thin portion for absorbing dimensional tolerance is formed in the connecting portion.

[0007]

According to the present invention, since the elastic button and the packing are integrated through the connecting portion, the opening of the first case, that is, the opening,
Water that has entered from the contact surface of the first case with the packing interposed around the elastic button and the fitting point of the first and second cases is flooded into the gap between the first case and the packing.
There is no water intrusion path in the space where the substrate and the like on which the electric parts and the like are mounted in the case is not flooded.

[0008] Therefore, the substantial flood path is only the contact surface between the packing and the second case, and the flood path is reduced.
Waterproofing is improved. Further, since the thin portion for absorbing the dimensional tolerance is formed in the connecting portion, the expansion of the dimensional tolerance accompanying the enlargement of the elastic button and the waterproof packing portion can be absorbed, and the assembling work and the like can be facilitated.

[0009]

FIG. 1 is a sectional view for explaining the structure of a waterproof case according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the waterproof case. In this embodiment, the first
, An upper case 11, a second case, a lower case 12, a button, and a molded rubber packing 1
3 and a substrate 14. An opening 16 is provided in the upper part of the upper case 11, and a rubber button portion 13a of the packing 13 protrudes outside through the opening 16.
The switch 15 is turned on and off by pressing the rubber button portion 13a. In addition, a projection 17 for bringing the rubber button portion 13a of the packing 13 to the center of the opening 16 of the upper case 11 is provided around the opening 16 inside the upper case 11, for screwing the upper and lower cases. Screw holes 19 are formed at the four corners, and concave portions 20 for fitting with the lower case 12 are provided on the outer peripheral portion.

The lower case 12 is provided with a convex portion 21 on the outer periphery corresponding to the upper case 11 for fitting with the upper case 11, a rib 22 for supporting the substrate 14 from below is provided, and Insertion holes 23 for screwing the case are formed at four corners. The packing 13 has a sheet-like shape integrated with a rubber button, and is provided with a hanging projection inside the case for supporting the internal substrate, and a concave portion 20 of the upper case 11 and a convex portion 21 of the lower case 12 on the outer peripheral portion. An uneven packing portion 13b is formed so as to be fitted with. Substrate 14 on which electrical components including switch 15 are mounted
Is provided with a round hole 26, and the tip 24 of the projection of the packing 13 is fitted into the round hole 26 to fix the substrate.
In addition, the tip portion 24 is swelled so that it does not easily come out of the round hole 26.

In order to assemble the above four components, first, the assembling of the upper case 11 and the packing 13 is performed by aligning the projection 17 of the upper case 11 with the groove 27 on the upper portion of the packing 13, and The convex portion of the packing portion 13b on the outer periphery of the packing 13 is fitted into the concave portion 20 for fitting with the packing 12. Then, the tip 24 of the projection of the packing 13 is inserted into the round hole 26 of the substrate 14, and the substrate 14 is fixed to the upper case 11 via the packing 13. Next, in order to fit the upper and lower cases, the protrusions 21 of the lower case 12 are fitted into the recesses 20 of the upper case 11 with the packing 13 interposed therebetween. In other words, the protrusion 21 of the lower case 12 is
Into the concave portion of the outer peripheral portion. Screws 28 are inserted into the insertion holes 23 formed at the four corners of the lower case 12 to
The upper case 11 and the lower case 12 are screwed into the screw holes 19 formed at the four corners of the first case with the screws 28.

Also, the input / output cable 29 is attached to the waterproof case.
When a waterproof bush 30 is required,
The input / output cable 29 is assembled via the connector, and the connector 31 at the end of the input / output cable is fitted to the mating connector mounted on the board 14. According to the above embodiment, the water inflow path into the space where the substrate 14 and the like inside the case exists is the packing 1
Only the contact surface between the lower case 3 and the lower case 12, that is, the opening 16 is completely blocked by the packing 13 from the space where the substrate 14 and the like inside the case is present, so that the inundation path is reduced and the opening 16 is mounted on the inner substrate 14. The waterproof performance of electric components and the like can be improved.

According to the present embodiment, the packing 1 is formed by integrating the rubber button 13a and the packing 13b.
The entire packing is usually deformed according to the shape of the upper case 11 because the whole 3 becomes large and the dimensional tolerance becomes large, but since the thin portion 32 is deformed and absorbs the tolerance,
The deformation of the rubber button portion 13a and the packing portion 13b is prevented, and the waterproofness is improved. Furthermore, even when the opening 16 of the upper case 11 and the rubber button 13a of the packing 13 are displaced (when the rubber button does not come to the center of the opening), the packing 13
Since the upper groove 27 is restricted by the protrusion 17 around the opening 16 of the upper case 11, the exposed portion of the rubber button portion 13a can be located at the center of the opening, and the commercial value is also improved.

Further, according to the present embodiment, the projections for supporting the substrate 14 are provided on the packing 13 itself, so that it is not necessary to make a hole for the boss for fixing the substrate 14 to be provided on the upper case 11 in the packing 13. In addition, the waterproof performance is further improved. Note that, also in the present embodiment, the place where the lower case 12 and the packing part 13b are fitted remains as a part requiring waterproofing. FIG. 3 is an enlarged cross-sectional view of the necessary portion for waterproofing. FIG.
In this embodiment, the height H1 of the convex portion of the lower case 12 is made larger than the recess H2 of the packing portion 13b, and the screws 21 are tightened.
By compressing and digging in the packing part 13b of No. 3 and further rounding the tip of the convex part 21 of the lower case, the rubber pressure can be concentrated at one point, the sealing performance of the case is improved, and the waterproof performance is enhanced.

In this embodiment, the number of the rubber button is one. However, it is possible to provide a plurality of buttons by applying this structure, and the packing is formed of rubber. It can also be realized with a material such as a waterproof resin. In this embodiment, the packing completely covers the inside of the upper case. However, the effect is slightly reduced, but a considerable effect can be obtained by providing a hole for passing a boss for fixing the substrate. It is.

[0016]

As described above, according to the structure of the waterproof case according to the present invention, the water penetration path is reduced or the area is reduced, so that the waterproof performance of the waterproof case can be improved. In addition, since the thin portion absorbs the variation in dimensional tolerance which is increased by integrating the rubber button portion and the packing portion, displacement of the rubber button portion and deformation of the packing portion can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a waterproof case according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the waterproof case according to the embodiment of the present invention.

FIG. 3 is a partially enlarged sectional view of the waterproof case according to the embodiment of the present invention;

FIG. 4 is a sectional view of a conventional waterproof case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Upper case 12 Lower case 13 Packing 13a Packing part 13b Rubber button part 14 Substrate 16 Opening of upper case 11 32 Thin part of packing 13

Claims (2)

(57) [Scope of request for utility model registration] A first case having an opening through which the elastic button is exposed; a second case fitted with the first case; and a waterproof case provided so as to be exposed to the outside through the opening. In a waterproof case structure comprising a sheet-like elastic button and a waterproof packing portion provided at a place where the first and second cases are fitted, the elastic button and the waterproof packing are integrated via a connecting portion. Wherein the elastic button and the waterproof packing cover the inner surface of the first case. 2. The waterproof case structure according to claim 1, wherein a thin portion for absorbing dimensional tolerance is formed in the connecting portion.