JPH11288635A - Watertight structure of case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a watertight structure of a case which has high watertight performance and resists aged deterioration. SOLUTION: In a case comprising an upper lid 2 having an opening and a lower lid 1 coupled to the upper lid, a watertight cover 3 is pressed against he lower lid 1 by the upper lid 2 while the upper lid 2 is coupled to the lower lid 1, so that a space formed by the watertight cover 3 and the lower lid 1 is closed to form a watertight structure in which parts placed in the space are kept from water. Projections 30 which are pressed against the upper lid 2 in such a way as to surround the opening in the upper lid 2 when the upper lid 2 is coupled to the lower lid 1 are formed on the watertight cover 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a case in which a waterproof cover for covering components such as electronic components is sandwiched between upper and lower lids.

[0002]

2. Description of the Related Art FIG. 3 shows an electronic device having a push switch.
FIG. 3 is a sectional view showing a waterproof structure of a case used for a transmitter, for example. The lower lid 1 has a rectangular box shape with an open upper surface, and a groove 21 is provided at the outer end of the inner bottom surface over the entire outer end of the inner bottom surface. A V-shaped groove 11 having a V-shaped cross section is provided on the inner surface of the side wall of the lower lid 1 so as to make a round around the side wall. The lower lid 1 is made of resin or metal such as aluminum.

The upper cover 2 has a rectangular box shape with an open lower surface, and a V-shaped rib 12 having a V-shaped cross section to be fitted into the V-shaped groove 11 of the lower cover 1 is provided on the outer periphery of the side wall. In addition, a hole 13 through which the pressing button 4 protrudes is provided on the upper surface of the upper lid 2. The upper lid 2 is formed of a resin or a metal such as aluminum. The waterproof cover 3 is in the shape of a square box with an open lower surface, and is provided with an L-shaped rib 20 having an L-shaped cross-section and extending outward on the entire periphery of the lower end of the side wall. Further, a press button 4 is integrally formed outside the upper surface.
The waterproof cover 3 has an elastic force and is integrally formed of a waterproof synthetic rubber member or the like. The printed circuit board 5 on which the switch 6, the battery 7 and the like are mounted is disposed in a closed space 60 formed by the lower lid 1 and the waterproof cover 3.

Next, a method of assembling the case will be described.
First, the printed circuit board 5 is fixed to a predetermined position on the bottom surface of the lower cover 1 with screws or the like. Next, the waterproof cover 3 is attached to the L-shaped rib 2.
The lower cover 1 is put on the lower lid 1 so that the leading end of the groove 0 enters the groove 21. Then, the top end of the upper cover 2 is fixed to the L-shaped rib 2 of the waterproof cover 3.
The V-shaped groove 11 and the V-shaped rib 12 are fitted into the lower lid 1 by pushing the 0 into the lower lid 1.

With such a structure, the L-shaped rib 20 is pressed and compressed by the lower lid 1 and the upper lid 2, and the L-shaped rib 20 of the waterproof cover 3 is brought into close contact with the upper lid 2 and the lower lid 1. Therefore, intrusion of water, dirt, and the like into the closed space 60 from the joint portion between the lower lid 1 and the upper lid 2 and the hole 13 for the push button 4 is prevented, and waterproofing is performed at this one place. The operation of the switch is performed by pressing the push button 4 and operating the switch 6.

[0006]

As described above, in the conventional waterproof case, since waterproofing is performed at one location in the waterproof portion A, the waterproof performance is poor if the waterproof function of this portion is impaired. There was a problem of the decrease. Water, dirt, and the like that have entered through the gap P between the hole 13 provided in the upper lid 2 and the press button 4 are likely to stay in the waterproof portion A, and this portion is separated from the outside air port (gap P). Since the dirt and the like are hard to evaporate, the water and the dirt and the like stay for a long period of time, and as a result, the waterproof portion A of the waterproof cover 3 is easily corroded and deteriorated. The operation of the push button 4 causes the waterproof cover 3
Since the vicinity of the waterproof portion A is deformed, the repetitive operation external force is easily accumulated as stress in this portion, and cracks and the like are easily generated in the waterproof cover 3. For this reason, the conventional waterproof case has a problem that the waterproof function decreases relatively quickly with time.

The present invention solves such a problem, and an object of the present invention is to realize a waterproof case that is more reliable and resistant to aging.

[0008]

In order to achieve the above object, the present invention provides a waterproof structure for a case, wherein the upper cover is pressed by the upper cover and surrounds the opening of the upper cover in a state where the upper cover and the lower cover are connected. As described above, the protrusions that are in close contact with the upper lid are formed on the waterproof cover. Further, in a state where the upper lid and the lower lid are connected to each other, a pressing member that presses and supports the protrusion from a rear surface side of the protrusion is provided.

Further, the pressing member is formed integrally with the waterproof cover. Further, a printed board is disposed in a space formed by the waterproof cover and the lower lid, and the pressing member is mounted on the printed board.

A push switch is disposed in a space formed by the waterproof cover and the lower lid, and a push button protruding from the opening and integrally operating the push switch is formed on the waterproof cover. It is characterized by having been done.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a waterproof structure of a case according to a first embodiment of the present invention. The first embodiment shown in FIG. 1 exemplifies a case used for a remote control transmitter in a wireless door lock system for an automobile.

The lower lid 1 has a rectangular box shape with an open upper surface, and a groove 21 is provided at the outer end of the inner bottom surface over the entire outer end of the inner bottom surface. A V-shaped groove 11 having a V-shaped cross section is provided on the inner surface of the side wall of the lower lid 1 so as to make a round around the side wall. The lower lid 1 is made of a thermoplastic resin or a metal such as aluminum. The upper lid 2 has a square box shape with an open lower surface, and a V-shaped rib 12 having a V-shaped cross section that fits into the V-shaped groove 11 of the lower lid 1 is provided on the outer periphery of the side wall. Further, a groove 22 is provided on the outer end of the inner upper surface of the upper cover 2 over the entire outer end of the inner upper surface, so that the convex rib 30 provided on the waterproof cover 3 is easily pressed and adhered. In addition, a hole 13 through which the pressing button 4 protrudes is provided on the upper surface of the upper lid 2. The upper cover 2 is made of a metal such as a thermoplastic resin or aluminum.

The waterproof cover 3 has a rectangular box shape with an open lower surface, and has a cross section L extending outward around the entire periphery of the lower end of the side wall.
An L-shaped rib 20 is provided. A convex rib 30 extending upward is provided on the entire periphery of the top end of the side wall of the waterproof cover 3. A push button 4 is integrally formed at a substantially central portion of the upper surface of the waterproof cover 3 (a position facing the hole 13 of the upper cover 2). And this waterproof cover 3
Is integrally formed of a synthetic rubber member or the like having elasticity and waterproof. A printed board 5 on which a switch 6, a battery 7 and the like are mounted is disposed in a closed space formed by the lower cover 1 and the waterproof cover 3.

Next, a method of assembling the case will be described.
First, the printed circuit board 5 is fixed to a predetermined position on the bottom surface of the lower cover 1 with screws or the like. Next, the waterproof cover 3 is attached to the L-shaped rib 2.
The lower cover 1 is put on the lower lid 1 so that the leading end of the groove 0 enters the groove 21. The upper lid 2 presses the L-shaped rib 20 of the waterproof cover 3 against the lower lid 1 at the tip of the upper lid 2, and the lower lid 1 such that the inner upper surface of the upper lid 2 presses the convex rib 30 of the waterproof cover 3. 1 and the V-shaped groove 11 and the V-shaped rib 12 are fitted.

With such a structure, the L-shaped ribs 20 and the convex ribs 30 provided on the waterproof cover 3 are pressed and compressed by the lower lid 1 and the upper lid 2, and in the waterproof portion A, the L-shaped rib 20 is In the waterproof portion B, the convex rib 30 is closely attached to the upper lid 2 at the same time as the lower lid 1, and waterproofing is performed in at least two places. Therefore, water, dirt, and the like that have intruded from the gap P between the press button 4 and the hole 13 are prevented by the convex ribs 30 at the waterproof portion B, and are separated from the outside air so that the accumulated water, dirt, and the like are difficult to discharge. To prevent water, dirt, and the like from entering the waterproof portion A. Then, even if water, dirt, and the like enter from this portion, entry into the interior is prevented again by the waterproof portion A.
Water, dirt, and the like that enter from the gap P stay between the convex rib 30 of the waterproof portion B and the gap P, but are relatively close to the outside air, so that they are easily discharged and the waterproof cover 3 corrodes due to the stay. There is no deterioration, and there are few failures even when used in a bad environment, and long-term use is possible. Also, by providing the convex ribs 30, the side wall surface of the waterproof cover 3 is
To a hard state due to the pressing and compressing action of. Therefore, the transmission of the deformation of the waterproof cover 3 due to the repeated operation of the switch of the push button 4 is blocked at the side wall portion. Therefore, the deformation of the waterproof cover 3 near the waterproof portion A is reduced, and the occurrence of cracks or the like due to the accumulation of stress in this portion can be prevented, and the deterioration of waterproof performance can be prevented.

Next, a second embodiment of the present invention will be described. FIG. 2 is a sectional view of a waterproof structure of a case according to a second embodiment of the present invention. The second embodiment shown in FIG. 2 exemplifies a case used for a remote control transmitter in a wireless door lock system for an automobile as in the first embodiment. The same parts as in the first embodiment are denoted by the same reference numerals, and the description is omitted.

The upper lid 2 has substantially the same structure as the upper lid 2 of the first embodiment, but has a structure in which the groove 22 in the first embodiment is omitted. The waterproof cover 3 has a rectangular box shape with an open lower surface, and a convex rib 40 is provided all around the waterproof portion C near the press button 4 on the outer surface of the upper surface. Further, an L-shaped rib 20 having an L-shaped cross section is provided to extend around the entire periphery of the lower end portion of the lower surface of the side wall of the waterproof cover 3. A push button 4 is integrally formed at a substantially central portion of the upper surface of the waterproof cover 3 (a position facing the hole 13 of the upper cover 2).
The waterproof cover 3 has an elastic force and is integrally formed of a waterproof synthetic rubber member or the like. The printed circuit board 5 on which the switch 6, the battery 7 and the like are mounted is disposed in a closed space 60 formed by the lower lid 1 and the waterproof cover 3. The printed board 5 has a backing plate 50 that supports the pressing of the upper lid 2 on the convex rib 40 provided on the waterproof cover 3 from the back side of the convex rib 40 when the lower lid 1 and the upper lid 2 are sandwiched and pressed. It is installed. It is also possible to adopt a configuration in which the waterproof rib 3 itself is integrally formed with a convex rib protruding toward the printed circuit board 5 and abutting on the printed circuit board 5 instead of the pressing and supporting plate 50.

Next, a method of assembling the case will be described.
First, the printed circuit board 5 is fixed to a predetermined position on the bottom surface of the lower cover 1 with screws or the like. Next, the waterproof cover 3 is attached to the L-shaped rib 2.
The lower cover 1 is put on the lower lid 1 so that the leading end of the groove 0 enters the groove 21. The upper lid 2 presses the L-shaped rib 20 of the waterproof cover 3 against the lower lid 1 at the tip of the upper lid 2, and also presses the inner upper surface of the upper lid 2 against the convex rib 40 of the waterproof cover 3. 1 and the V-shaped groove 11 and the V-shaped rib 12 are fitted.

With such a structure, the L-shaped rib 20 and the convex rib 40 provided on the waterproof cover 3 are pressed and compressed by the lower lid 1 and the upper lid 2, and the L-shaped rib 20 in the waterproof portion A is At the same time, the convex rib 40 is closely attached to the upper lid 2 in the waterproof portion C, and waterproofing is performed in at least two places. Therefore, water, dirt, and the like that have intruded from the gap P between the press button 4 and the hole 13 are prevented by the convex rib 40 of the waterproof portion C, and are separated from the outside air so that accumulated water, dirt, and the like are difficult to be discharged. To prevent water, dirt, and the like from entering the waterproof portion A. Then, even if water, dirt, and the like enter from this portion, entry into the interior is prevented again by the waterproof portion A.
Water, dirt, and the like that enter from the gap P stay between the convex rib 40 of the waterproof portion C and the gap P, but are relatively close to the outside air, so that they are easily discharged and the waterproof cover 3 corrodes due to the stay. There is no deterioration, and there are few failures even when used in a bad environment, and long-term use is possible. In addition, by providing the convex rib 40 and the backing plate 50 (or the convex rib having the same function integrally provided on the waterproof cover 3 itself), the lower lid 1 and the upper lid 2 are provided.
Of the convex rib 40 and the contact plate 5 by pressing the waterproof cover 3
0 is in a hard state due to the pressing and compressing action. For this reason,
The transmission of the deformation of the waterproof cover 3 due to the repeated operation of the switch of the push button 4 is prevented by the convex rib 40 and the backing plate 50.
Therefore, the deformation of the waterproof cover 3 near the waterproof portion A is reduced, and the occurrence of cracks or the like due to the accumulation of stress in this portion can be prevented, and the deterioration of waterproof performance can be prevented.

[0020]

As described above, according to the present invention, invasion of water, dirt, and the like occurs at two places: a contact portion between the waterproof cover and the lower cover, and a contact portion between the protrusion of the waterproof cover and the upper cover. Because it is blocked, the waterproof performance is high. In addition, since the contact portion between the protrusion of the waterproof cover and the upper lid is relatively close to the opening, it is possible to prevent water, dirt, and the like from staying in this portion for a long period of time, thereby preventing deterioration of the characteristics of the waterproof cover. can do. In the structure in which the projection is pressed and supported on the upper lid, the projection is hardened by being pressed and compressed. Even when the push button is formed integrally with the waterproof cover, the deformation of the waterproof cover by the operation of the push button is transmitted by the projection. And it is difficult to be transmitted to the contact portion between the waterproof cover and the upper lid or the lower lid. Therefore, it is possible to reduce the accumulation of stress in these contact portions due to the operation of the push button, and it is possible to prevent the deterioration of characteristics such as the occurrence of cracks in these contact portions.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing a waterproof structure of a case according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a waterproof structure of a conventional case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lower lid 2 ... Upper lid 3 ... Waterproof cover 4 ... Press button 5 ... Printed circuit board 13 ... Operation hole 20 ... L-shaped rib 21 ... Waterproof Groove 22 ... Groove 30 ... Waterproof convex rib 40 ... Waterproof convex rib 50 ... Patch plate 60 ... Closed space

Claims (5)

[Claims] 1. A case in which an upper lid having an opening and a lower lid are coupled to each other, wherein the waterproof cover is pressed against the lower lid by the upper lid when the upper lid and the lower lid are coupled to each other. In a waterproof structure in which the space formed by the waterproof cover and the lower lid is tightly sealed to the lid and waterproofs components disposed in the space, the upper lid and the lower lid are pressed against the upper lid in a coupled state. A waterproof structure for a case, wherein a protrusion is formed on the waterproof cover so as to be in close contact with the upper cover so as to surround the opening of the upper cover. 2. The waterproof structure for a case according to claim 1, further comprising a pressing member that presses and supports the projection from a back side of the projection in a state where the upper lid and the lower lid are connected. 3. The waterproof structure for a case according to claim 2, wherein the pressing member is formed integrally with the waterproof cover. 4. The case according to claim 2, wherein a printed circuit board is disposed in a space formed by the waterproof cover and the lower cover, and the pressing member is mounted on the printed circuit board. Waterproof structure. 5. A push switch is provided in a space formed by the waterproof cover and the lower lid, and a push button for operating the push switch is formed integrally with the waterproof cover, the push button protruding from the opening. 5. The waterproof structure for a case according to claim 1, wherein the waterproof structure is provided.