JPH0443678B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing structure for a casing.

As shown in FIG. 8, the conventional casing sealing structure is such that the second casing is attached to the opening formed in the first casing via an annular sealing member C with screws. This prevents water from entering the casing, but since the sealing member is made of an elastic material such as rubber, it is easily deformed during assembly, and if it is deformed during assembly, the sealing member may become misaligned. If the sealing performance of the first casing I deteriorates and water easily enters the first casing I, and water enters the first casing I, the container housed inside the first casing I object (not shown)
There was a problem in that it was damaged.

In order to solve the above problem, as shown in Japanese Patent Application Laid-Open No. 52-112047, first, a holding member for the sealing member is molded, and then one side of the mold is replaced with another mold to integrally mold the sealing member. A method has been proposed to form the

By the way, when a sealing member made of an elastic material and a casing made of a hard synthetic resin material are integrally molded using a mold, if the two parts are not securely bonded, the mold may be released. The sealing member may fall or become misaligned during assembly or disassembly of the casing. In addition, among the elastic materials such as rubber that form the sealing member, synthetic resin materials that form the casing during molding (e.g.
There are materials that can be bonded to ABS (ABS) and materials that are not, and materials with high elasticity are difficult to adhere to, while elastic materials that are easily bonded have low elasticity.

Therefore, when configuring the sealing structure of the casing by the method shown in JP-A No. 52-112047,
In order to improve the sealing performance of a sealing member, it is necessary to use a member with high elasticity, but in this case, the sealing member is likely to fall or become misaligned; In order to prevent this, it is necessary to use a member with low elasticity, but in this case, there is a contradictory problem that the sealing performance of the sealing member is poor.

The present invention has been made in view of the above-mentioned problems, and its purpose is to prevent deformation and positional displacement of the sealing member when releasing the mold or when assembling and disassembling the casing, and to prevent airtightness by the sealing member. The objective is to provide a casing sealing structure with high performance.

Hereinafter, the present invention will be described with reference to drawings showing an example of an electric shaver casing, which is composed of a first casing that is open at both ends, and second and third casings that are coupled to the openings of the first casing. explain.

The first casing 1 is made of synthetic resin and is formed into a cylindrical shape with openings at both ends, and includes a first opening 4 to which a second casing 3 equipped with a motor mounting base 2 is coupled, and a bottom cover 5. A second opening 7 is formed to which a third casing 6 is coupled. 1st
A step 8 is formed in the opening 4 of the holder 4, and an annular projection 9 is formed in the step 8. A step 10 is formed in the second opening 7, and the step 10 is formed in the second opening 7.
0 has an annular projection 11 formed thereon. The second casing 3 includes a motor mount 2 to which the motor 12 is attached, a flushing ring 13 that is rotatably loosely fitted to the motor mount 2, and a flushing ring 13 that is attached to the motor mount 2 and falls off. The outer cutter 15 is provided with an outer cutter mount 14 which also has a function of preventing this, an outer cutter 15 that is detachably attached to the outer cutter mount 14, and an inner cutter 16 that slides into contact with the inner surface of the outer cutter 15. The motor mounting base 2 is made of synthetic resin material, and the first
The flange portion 1 that fits into the step portion 8 of the casing 1 of
7 has an annular groove 18 formed therein.

As shown in FIGS. 2 and 4, the first sealing member 19 is formed of rubber into an annular shape, and is integrally formed with the flange portion 17 while being housed in a groove by molding different materials. A portion of the stepped portion 8 is crushed by the protrusion 9, thereby enhancing the sealing effect. Further, as shown in FIG. 6, the groove 18
The tapered part 20 is designed so that the width becomes wider toward the back.
is formed to prevent the first sealing member 19 from coming off during mold release, assembly, and disassembly.

As shown in FIGS. 2 and 3, the water washing ring 1
3 is made of a synthetic resin material, and an opening 21 and a knob 22 are formed in the circumferential body. The outer blade mounting base 14 is made of synthetic resin material, and the water washing ring 13
An opening 23 is formed which corresponds to the opening diagram 21 in FIG. The motor mount 2 is fixed to one end of the first casing 1 with a screw 24, and the outer cutter mount 14 is fixed to the motor mount 2 with a screw 25. The output shaft 26 of the motor 12 has a shaft seal member 27
It penetrates through and protrudes from the motor mounting base 2,
The output shaft 26 of the motor 12 is connected to the inner cutter 16 via a joint 28 that is fitted onto the output shaft 26 .
The lamp cover 29 is made of synthetic resin and is fixed to the first casing 1. The bottom cover 5 is made of a synthetic resin material, and a flange portion 30 that fits into the step portion 10 at the other end of the first casing 1 has an annular groove 31 similar to the recess 18 described above. ing.

As shown in FIGS. 2 and 5, the second sealing member 32 is formed of rubber into an annular shape, and is integrally formed with the flange portion 30 while being housed in the groove 31 by molding different materials. and step 1
A portion is crushed by the protrusion 11 of 0, which enhances the sealing effect.

As shown in FIGS. 2 and 3, the bottom cover 5 is fixed to the first casing 1 with screws 33. A light emitting diode 34 is fixed to the third casing 6 and faces the lamp cover 29.
Side covers 3 are provided on both sides of the first casing 1.
5 and 36, and the first side cover 35 is slidably provided with a switch handle 37 which is housed in the first casing 1 and which turns on and off a reed switch (not shown). , the first casing 1 is made waterproof by providing a reed switch. The battery 38 is a contact fitting 39
It is connected to the motor 12 via.

Therefore, in the first molding of different materials, the motor mounting base 2 and the bottom cover 5 are molded from synthetic resin material,
In the next second molding, as shown in FIG. It is filled with an elastic material.

In the embodiment, the opening 2 of the flush ring 13
1 and the opening 23 of the outer cutter mounting base 14, and put the outer cutter 15 and the inner cutter 16 into the water to introduce water into the beard storage chamber 42, and then turn on the switch to open the inner cutter 16. Since the beard debris in the beard storage chamber 42 is washed away by rotating it, it is necessary to watertightly isolate the interior and exterior of the first casing 1.

In the above embodiments, the explanation has been given of FIG. 1 and the case in which the second sealing members 9 and 32 are provided in the second casings 3 and 6, but the sealing members may be provided in the first casing 1. .

As described above, the casing sealing structure according to the present invention forms an annular groove on one joining surface of a pair of casings that are joined to each other, and
The groove is characterized in that the inner part is wider than the opening, the groove is filled with an elastic material, and the sealing member is integrally molded. The casing and sealing member can be molded at the same time with a molding machine on the stand, which not only saves the trouble of installing the sealing member, but also allows the sealing member to be integrally molded by filling an elastic material into the groove with a wide inner part. This eliminates the possibility of the sealing member falling or shifting when releasing the mold or assembling or disassembling the casing, and prevents the sealing member from falling or shifting its position when the mold is released or when the casing is assembled or disassembled. There is no need for the troublesome work of inserting the sealing member into the groove.

Moreover, since the sealing member can be molded from a material with high elasticity, it has a high sealing performance and is effective in reliably preventing water from entering the casing.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an electric shaver implementing the casing sealing structure of the present invention, Fig. 2 is a sectional view of the same, Fig. 3 is an exploded perspective view of the same, and Fig. 4 is an exploded perspective view of the same.
The figure is a partially cutaway external perspective view of the motor mounting base.
Figure 5 is an external perspective view with a part of the bottom cover cut away;
FIG. 7 is an enlarged cross-sectional view of the main part of the motor mounting base, FIG. 7 is a cross-sectional view illustrating molding of different materials, and FIG. 8 is an exploded perspective view of a conventional example corresponding to FIG. 3 with some parts omitted. 1...First casing, 3...Second casing, 6...Third casing, 18, 31...
Concave groove, 19, 32...Sealing member.

Claims (1)

[Claims] 1 A sealing structure for a casing that is connected to the open end of a casing made of a synthetic resin material divided into a plurality of parts via a sealing member, in which an annular groove is formed on one joining surface of a pair of casings that are joined to each other. The sealing structure for a casing is characterized in that the groove has a deeper part wider than the opening, and a sealing member is integrally molded by filling the groove with an elastic material.