JPH0670292U - Waterproof case structure - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a waterproof case with improved waterproof performance. [Configuration] A first case having an opening for attaching a button,
A second case fitted to the first case, a waterproof sheet-like elastic button provided so as to be exposed to the outside from the opening, and the first and second cases are fitted to each other. In a waterproof case structure including a waterproof packing part provided at a location, the elastic button and the waterproof packing part are integrated via a connecting part, and the elastic button and the waterproof packing cover the inner surface of the first case. It is characterized in that

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a case having a waterproof structure.

[0002]

[Prior art]

 Waterproofness may be required in the case of various electronic devices, but especially remote control devices such as construction machines, machine tools, radio-controlled models, etc. are used in a severe outdoor environment, so they are waterproof and dustproof. There are various specifications such as 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, and a rubber packing 43 for waterproofing is sandwiched between them and fastened together by screws 44, so that the upper and lower cases 41, 42 are fitted together. A foot portion 45 is formed on the upper case 41 toward the inside of the case, and a board 47 on which electrical components including a switch 46 are mounted is fixed to the foot portion 45 by a screw 48. An opening 49 is formed at a portion 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 through the opening 49. The rubber button 50 is wider than the opening 49 and thicker than the space formed by the upper case 41 and the substrate 47. A through hole 51 is formed at the end of the rubber button 50, and the foot portion 45 of the upper case 41 is inserted into the through hole 51 and sandwiched between the upper case 41 and the substrate 47 to fix the rubber button 50 to the case. It

Therefore, according to this structure, the packing 43 is provided at the fitting position of the upper and lower cases 41, 42, and the opening 49 of the upper case 41 has the rubber button 50 on the inner surface of the upper case 41 by the substrate 47. As the case is pressed, the case is sealed and waterproof and dustproof.

[0004]

[Problems to be solved by the device]

 Although the conventional waterproof case structure described above has a considerable dust-proof effect, it still has a problem in terms of waterproofing. That is, there are three paths through which water enters, that is, the contact surface between the upper case 41 and the rubber button 50, and the contact surfaces 52 and 53 between the upper and lower cases 41 and 42 and the packing 43, and the area of that path is wide. Therefore, water may enter into 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 narrowed to reduce the inundation.

[0005]

[Means for Solving the Problems]

 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 to the first case, and exposed through the opening. In a waterproof case structure including a waterproof sheet-like elastic button provided as described above and a waterproof packing portion provided at a portion where the first and second cases are fitted, the elastic button and the waterproof packing are provided. Is integrated via a connecting portion, and the elastic button and the waterproof packing cover the inner surface of the first case.

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

[0007]

[Action]

 According to the present invention, since the elastic button and the packing are integrated through the connecting portion, the elastic button and the packing are integrated into the opening of the first case, that is, the periphery of the elastic button and the fitting portions of the first and second cases. Water that has entered through the existing packing and the contact surface of the first case will enter the gap between the first case and the packing, but there will be a board where electrical parts, etc. are mounted inside the case. There is no inundation route in, so it will not be inundated.

Therefore, the substantial water immersion path is only the contact surface between the packing and the second case, the water immersion path is reduced, and the waterproof property is improved. Further, since the connecting portion is formed with the thin portion for absorbing the dimensional tolerance, it is possible to absorb the increase in the dimensional tolerance due to the increase in size of the elastic button and the waterproof packing portion, which facilitates the assembling work and the like.

[0009]

Embodiment FIG. 1 is a sectional view for explaining the structure of a waterproof case according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the waterproof case. In this embodiment, it is composed of an upper case 11 which is a first case, a lower case 12 which is a second case, a button, a body-molded rubber packing 13 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 projects to the outside from the opening 16. Then, the switch 15 is turned on and off by pressing the rubber button portion 13a. Further, a protrusion 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 inside the upper case 11, and the upper and lower cases are screwed to each other. Screw holes 19 are formed at the four corners to allow the lower case 12 to be fitted, and recesses 20 for fitting the lower case 12 are provided on the outer peripheral portion.

The lower case 12 is provided with a convex portion 21 corresponding to the upper case 11 for fitting with the upper case, a rib 22 for pushing up the substrate 14 from below, and a vertical portion. Insertion holes 23 for screwing the case are formed at the four corners. The packing 13 is in the form of a sheet integrated with a rubber button, and is provided with a protrusion that hangs inside the case in order to support an internal substrate. The outer peripheral portion has a concave portion 20 of the upper case 11 and a convex portion of the lower case 12. An uneven packing portion 13b is formed so as to be fitted with 21. A round hole 26 is provided in the board 14 on which electric parts including the switch 15 are mounted, and the tip end 24 of the protrusion of the packing 13 is fitted into the round hole 26 to fix the board. The tip portion 24 is swollen so that it cannot be easily pulled out from the round hole 26.

In order to assemble the above four components, first, the upper case 11 and the packing 13 are assembled by aligning the protrusion 17 of the upper case 11 and the groove 27 of the upper part of the packing 13 and then the lower case of the upper case 11. 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 12. Then, the tip end portion 24 of the protrusion 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 convex portion 21 of the lower case 12 is fitted with the packing 13 sandwiched in the concave portion 20 of the upper case 11. In other words, the convex portion 21 of the lower case 12 is fitted into the concave portion of the outer peripheral portion of the packing 13. The screws 28 are inserted into the through holes 23 formed at the four corners of the lower case 12, and the upper case 11 and the lower case 12 are screwed into the screw holes 19 formed at the four corners of the upper case 11 with the screw 28. To wear.

When the waterproof case requires the input / output cable 29, the input / output cable 29 is assembled to the lower case 12 via the waterproof bush 30, and the connector 31 at the front end of the input / output cable is attached to the board 14. Mate with the mating connector mounted on. According to the above-described embodiment, the water immersion path to the space where the board 14 inside the case exists is only the contact surface between the packing 13 and the lower case 12, that is, the opening 16 is formed by the packing 13 and the board 14 inside the case. Since it is completely cut off from the space in which water is present, the number of water infiltration paths is reduced, and the waterproof performance of the electrical components mounted on the internal board 14 can be improved.

In addition, according to the present embodiment, by integrating the rubber button portion 13a and the packing portion 13b, the packing 13 as a whole becomes large and the dimensional tolerance becomes large. Therefore, the packing as a whole is usually fitted to the shape of the upper case 11. Although it is about to be deformed, since the thin portion 32 is deformed and absorbs the tolerance, the rubber button portion 13a and the packing portion 13b are prevented from being deformed, and the waterproof property is improved. Further, even if the opening 16 of the upper case 11 and the rubber button portion 13a of the packing 13 are misaligned (when the rubber button does not come to the center of the opening), the groove 27 on the upper part of the packing 13 will not open. Since the protrusions 17 around the portion 16 are regulated, the exposed portion of the rubber button portion 13a can be located in the center of the opening portion, and the commercialability is improved.

Further, according to the present embodiment, since the packing 13 itself is provided with the projections for supporting the substrate 14, it is necessary to form a hole in the packing 13 for inserting the boss for fixing the substrate 14 to be provided in the upper case 11. Since it is eliminated, the waterproof performance is further improved. In this embodiment as well, the portion where the lower case 12 and the packing portion 13b are fitted remains as a waterproof portion. FIG. 3 is an enlarged sectional view of the waterproof required portion. As shown in FIG. 3, 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 when the screws are tightened, the convex portion 21 of the lower case is filled with the packing 1 3. By compressing and biting the packing portion 13b of the above, and further rounding the tip of the convex portion 21 of the lower case, the rubber pressure can be concentrated at one point, and the sealing property of the case is improved and the waterproof performance is improved.

In this embodiment, the number of rubber buttons is one, but it is also possible to apply this structure to provide a plurality of buttons, and the packing is made of rubber, but the elasticity is low. Yes, it can be realized with materials such as water-proof resin. In this embodiment, the packing completely covers the inside of the upper case. However, although the effect is slightly reduced, a structure such as a hole through which a boss for fixing the substrate is provided has a considerable effect. Is.

[0016]

[Effect of device]

 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. Further, since the thin-walled portion absorbs the variation in the dimensional tolerance, which is increased by integrating the rubber button portion and the packing portion, the displacement of the rubber button portion and the deformation of the packing portion can be prevented.

[Brief description of 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 a waterproof case according to an embodiment of the present invention.

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

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

[Explanation of symbols]

 11 Upper Case 12 Lower Case 13 Packing 13a Packing Part 13b Rubber Button Part 14 Board 16 Opening of Upper Case 11 32 Thin Part of Packing 13

Claims (2)

[Scope of utility model registration request] 1. A first case having an opening through which an elastic button is exposed, a second case fitted to the first case, and a waterproof case provided so as to be exposed to the outside through the opening. In a waterproof case structure including a sheet-like elastic button and a waterproof packing portion provided at a portion where the first and second cases fit, 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. 2. The waterproof case structure according to claim 1, wherein a thin portion for absorbing dimension tolerance is formed in the connecting portion.