JP2004031751A - Waterproofing structure of casing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that air tightness is hardly held since a through hole remains after welding although it is necessary to provide the through hole for inserting an electrode for energizing heating wires, when jointing a casing body and a lid body, setting the heating wires inside a groove which is a junction part thereof and fusing and jointing the casing body and the lid body mutually by energizing the wires. <P>SOLUTION: An alternative part 23 is provided on a groove 21, and the through hole 7 is provided on the outside of the alternative part. The through hole 7 and the inside of the casing are isolated by means of the alternative part 23. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a waterproof structure for preventing water or moisture from entering a casing of a bathroom television, for example.
[0002]
[Prior art]
For example, a bathroom television mounted on a bathroom wall is exposed to hot water or an atmosphere of high humidity for a long time. Many electronic components are housed inside the bathroom TV, and these electronic components are weak to moisture, let alone hot water, and if hot water or moisture enters the bathroom TV casing, the life of the bathroom TV will be significantly shortened .
[0003]
Since the electronic components are housed inside the casing, the casing cannot be formed integrally.Therefore, a casing body and a lid for sealing the inside of the casing water-tightly after housing the electronic components in the casing body are provided. I have. As a method of attaching the lid to the casing main body, for example, it is conceivable to screw the lid to the casing main body in a state where the packing is sandwiched between the casing main body and the lid.
[0004]
However, such a method of screwing not only requires packing costs, but also requires a large number of man-hours for screwing, and increases the manufacturing cost of the bathroom television.
[0005]
In addition, a method is conceivable in which after the electronic component is stored in the casing main body, the lid is adhered to the casing main body with an adhesive. This method of bonding with an adhesive does not require packing and does not require any man-hour for screwing. However, the casing is stored for about one day until the adhesive is sufficiently cured and a predetermined adhesive strength is obtained. There must be. Therefore, a storage space is required, and the manufacturing cost of the bathroom TV is also increased.
[0006]
As a method for solving such a problem, there are Japanese Patent No. 3053786 and Japanese Patent No. 2937311. In both patents, a pair of heating wires having substantially the same shape are arranged so as to form an annular shape between the casing body and the lid, and both heating wires are energized to form a contact portion between the casing body and the lid. It melts and welds the lid to the casing body.
[0007]
[Problems to be solved by the invention]
In the method according to both patents, it is necessary to form a through hole for bringing a terminal for supplying electricity to the heating wire into contact with the heating wire.When the terminal is inserted into this through hole, electricity is supplied to the heating wire and the welding process is completed, It is necessary to pull out the terminal from the through hole. Therefore, after welding, the through hole remains without being closed.
[0008]
In the above two patents, since the through hole is provided inside the heating wire, the portion where the heating wire is interposed is welded, but water that has entered from the through hole enters the inside of the heating wire, that is, into the casing. There is a risk. If the through hole is provided outside the heating wire, such a problem is solved. However, simply providing the through hole outside the heating wire causes the portion provided with the through hole to protrude from the outer peripheral surface of the casing. , Can not be adopted to spoil the design.
[0009]
In view of the above problems, it is an object of the present invention to provide a waterproof structure for a casing that can completely prevent water from entering without damaging the design.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the waterproof structure of the casing according to the present invention has a through-hole into which an electrode is inserted at substantially two symmetrical locations of an annular groove formed in a peripheral portion of a casing body made of a thermoplastic resin. In addition, a pair of heating wires whose both ends overlap the through holes are disposed in the groove, and an annular convex portion formed on a lid member made of a thermoplastic resin is fitted into the groove of the casing body. In the waterproof structure of the casing in which an electrode is inserted into the through hole in a state where the heat is generated and the bottom of the groove is welded to the end of the convex portion, the through hole is detoured to the inside of the casing body in the groove. A detour portion and a communication portion communicating from the detour portion to the through hole are formed, and the heating wire is disposed so as to reach the through hole from the detour portion through the communication portion.
[0011]
Since the bypass part bypasses the through hole to the inside of the casing main body, if the heating wire is provided in the groove, the through hole is located outside the heating wire. Therefore, even if water or the like enters the through hole after the lid is welded to the casing main body, the water or the like does not enter the inside of the casing beyond the welded portion along the heating wire. Further, since the detour portion detours inside the casing main body, the detour portion does not protrude to the outer peripheral surface of the casing, and the design of the casing is not spoiled.
[0012]
If a communication portion is provided at one end of the detour portion, the groove extending toward the through-hole reaches the groove as it is, and the detour portion branches immediately before reaching the groove. Therefore, the heating wire that does not pass through the detour portion can be overlapped with the through hole without bending the end portion.
[0013]
When a casing is mounted on a wall surface as in a bathroom television, a mounting hole must be provided in the casing.However, adjacent to the through hole, a mounting hole for mounting the casing to the wall is formed, and the mounting hole is formed. If the bypass part is configured to bypass the mounting hole together with the through hole, the waterproofness of the casing is maintained as in the case of the through hole even if water or the like enters the mounting hole.
[0014]
The waterproof structure of the casing according to the present invention is suitable for a casing of a bathroom television mounted on a wall surface of a bathroom, for example.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIG. 1, reference numeral 1 denotes a television for a bathroom, which is fixed to a wall surface BW of the bathroom. Hot water in the bathtub BT or hot water spouting from the shower falls on the television 1, and water drops adhere to the television 1 due to high humidity. Therefore, it is necessary to adopt a waterproof structure so that hot water and moisture do not enter the inside of the television 1.
[0016]
As shown in FIG. 2, in the television 1, the lid 3 is welded to the casing main body 2 with the substrate 4 stored in the casing main body 2. In addition, a convex portion 31 is formed on the lower surface of the lid 3 in an annular shape, and the annular convex portion 31 is formed so as to be inserted into an annular groove 21 formed in the casing body 2.
[0017]
Various switches 32 are attached to the lid 3 in a waterproof state. Reference numeral 33 denotes a speaker attachment portion. By attaching a waterproof speaker, hot water does not enter the casing body 2 from the attachment portion 33. The various switches 32 and the speaker are connected to the substrate 4 via a film-like cable 42. Reference numeral 41 denotes a cable in which a power supply and an antenna line are collected.
[0018]
Then, after the lid 3 is welded to the casing main body 2, a screw is inserted into a screwing hole to fix the casing composed of the casing main body 2 and the lid 3 to the wall surface BW. Reference numeral 5 denotes a cover, which is fitted to the casing from the front after fixing the casing to the wall surface BW.
[0019]
As shown in FIGS. 3 and 4, the groove 21 of the casing body 2 is formed in an annular shape along the outer shape of the casing body 2. However, a detour portion 23 is formed so that the through hole 7 and the mounting hole 22 are located outside the groove 21 so as to bypass the through hole 7 provided adjacent to the mounting hole 22. And the communication part 24 which continued from the bypass part 23 to the through-hole 7 was formed. The casing body 2 and the lid 3 are both formed of a thermoplastic resin, and 23a is a hollow for preventing the occurrence of “shrinkage” due to shrinkage during curing. Does not penetrate.
[0020]
The through holes 7 are formed at substantially symmetric positions in the left and right directions in the state shown in FIG. Then, the gate-shaped heating wires 61 and 62 shown in FIG. The intermediate portions 61a and 62a of the heating wires 61 and 62 are formed in a straight line as shown in FIG. On the other hand, portions of the groove 21 corresponding to the intermediate portions 61a and 62a are slightly curved outward as shown. Therefore, when both the heating wires 61 and 62 are mounted in the groove 21, the intermediate portions 61a and 62a bend to the state shown by the two-dot chain line in FIG. Since the heat generating wires 61 and 62 have elasticity, when they are bent to the state shown by the two-dot chain line, an urging force is generated to return to the linear state. The urging force causes the heat generating wires 61 and 62 to be strong against the inner wall of the groove 21. It does not come out of contact with the groove 21 and does not fall out.
[0021]
The length of each of the heating wires 61 and 62 is set so that both ends 61b and 62b of the heating wires 61 and 62 reach the through holes 7, respectively. One end of each of the heating wires 61 and 62 is bent in accordance with the shape of the detour 23. In the case of the heating wire 62, as shown in FIG. 4, a bent portion 62c is formed, and a tip 62b is formed in the bent portion 62c.
[0022]
Since both ends 61b and 62b of both the heating wires 61 and 62 have reached the through-hole 7, the electrode is inserted into the through-hole 7 with the convex portion 31 of the cover 3 fitted in the groove 21 as shown in FIG. When T is inserted, the electrode T contacts the tips 61b and 62b. When the electrodes T are inserted into the through holes 7 and the heating lines 61 and 62 are energized, the heating lines 61 and 62 generate heat and melt the periphery of the bottom of the groove 21 and the tip of the projection 31. When the lid 3 is pressed against the casing body 2 in the molten state, the lid 3 relatively moves by a distance d shown in FIG. Thereafter, when the power supply is stopped and cooling is performed, the molten portion is solidified, and the groove 21 and the convex portion 31 are fixed to each other.
[0023]
As described above, since the groove 21 is formed in an annular shape, it is welded over the entire circumference of the casing. Further, since the through hole 7 is located outside the annular welded portion, even if hot water enters the through hole 7 after the electrode T is pulled out from the through hole 7, the hot water does not enter the casing. Absent.
[0024]
By the way, in the above embodiment, two heating wires are used, but as shown in FIG. 6, one heating wire 6 may be used.
[0025]
【The invention's effect】
As is evident from the above description, the present invention, when fixing the casing body and the lid body constituting the casing using a heating wire, without providing an unnecessary convex portion on the outer periphery, and also forming the peripheral wall of the casing body. Without thickening, it is possible to completely prevent hot water or the like from entering the inside of the casing.
[Brief description of the drawings]
FIG. 1 is a view showing a configuration of an embodiment of the present invention; FIG. 2 is an exploded perspective view of a casing; FIG. 3 is a view showing shapes of grooves and heat generating wires of a casing main body; FIG. FIG. 5 is a cross-sectional view showing a state before welding of a bypass part. FIG. 6 is a view showing another embodiment of a heating wire. FIG. 7 (a) shows a state of a conventional through hole. Fig. (B) Diagram showing the state of a conventional through-hole.
DESCRIPTION OF SYMBOLS 1 Bathroom television 2 Casing main body 21 Groove 23 Detour 3 Cover 31 Convex part 4 Board 5 Cover 6 Heating wire 61 Heating wire 62 Heating wire 7 Through hole

Claims (4)

At two substantially symmetrical annular grooves formed in the peripheral portion of the casing body made of a thermoplastic resin, through holes for inserting electrodes are formed, and a pair of both ends overlap the through holes. A heating wire is disposed in the groove, and an electrode is inserted into the through hole with the annular convex portion formed on the lid member made of a thermoplastic resin fitted in the groove of the casing body, and the heating wire is energized. In the waterproof structure of the casing that welds the bottom of the groove and the end of the convex portion, a bypass portion that bypasses the through hole to the inside of the casing body in the groove, and a communication portion that communicates with the through hole from the bypass portion. The waterproof structure of the casing, wherein the heating wire is disposed so as to reach the through hole from the detour portion through the communication portion. The waterproof structure for a casing according to claim 1, wherein a communication portion is provided at one end of the bypass portion. The casing according to claim 1 or 2, wherein a mounting hole for mounting the casing to the wall is formed adjacent to the through hole, and the bypass portion bypasses the mounting hole together with the through hole. Waterproof structure. The waterproof structure for a casing according to any one of claims 1 to 3, wherein the casing is a casing of a bathroom television attached to a wall surface of a bathroom.

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