JP3419286B2 - Waterproof structure of instrument case - Google Patents

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 an instrument case, and relates to an improvement of a waterproof structure suitable for application to, for example, a plug-in type instrument.

[0002]

2. Description of the Related Art Although a plug-in type instrument is not shown,
A bottomed box-shaped instrument case is provided with a flange on the outer periphery of the opening, multiple external connection terminals are formed through the bottom, and multiple circuit boards are attached to the back side of the front cover. And the circuit board is connected to the external connection terminals, the opening is closed by the front lid, and the instrument case is inserted into the mounting hole of the instrument mounting panel from the external connection terminal side, that is, the back side. There is known a configuration in which a flange is locked to a panel and a back side of the panel is pressed by a pressing tool provided on the instrument case so that the instrument case is fixed so as to be sandwiched by the panel.

In addition, conventionally, from the viewpoint of ensuring the waterproof function between the instrument case and the front lid portion, and between the instrument case and the panel, both the instrument case and the front lid portion and between the instrument case and the panel are provided. The instrument case was fixed to the panel with elastic bodies, for example, rubber packings interposed separately.

[0004]

However, in the waterproof structure having the above-described structure, it is necessary to fix separate packings between the front cover and the flange of the instrument case or between the flange and the panel with an adhesive or other fixing means. Because there was
In addition to requiring multiple separate packings of different shapes,
An operation of adhering these packings to a plurality of places with an adhesive or the like is required, and improvement has been desired from the viewpoint of cost reduction and simplification of manufacturing. Furthermore, even if the packing is simply placed between the instrument case and the front lid part or on the rear side of the flange, a high waterproof effect is not always obtained, and special measures are required to ensure a good waterproof effect. Met.

The present invention has been made under such circumstances and provides a waterproof structure which is inexpensive and easy to manufacture, while achieving a good waterproof effect, reducing the number of constituent parts and simplifying the manufacturing process. With the goal.

[0006]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention has a flange on the outer periphery of a front opening and inserts the flange from the back side into a mounting hole provided in the panel so that the flange contacts the panel. The instrument case that is attached so as to be in contact with the instrument case, the front lid that covers the opening of the instrument case, and the frame-shaped waterproof elastic packing that is supported by the instrument case. A packing having a frame-shaped first abutting portion whose tip projects from the inner wall of the part and a frame-shaped second abutting portion integrally formed on the panel side of the flange, and the instrument case. And a pressing member that presses the back side of the panel and fixes the instrument case so as to sandwich the panel between the flange and the panel.

Moreover, when the front cover is covered with the instrument case, the first contact part is expanded and bent by the pressure contact of the front cover, and the second contact is made by pressing the panel with the pressing tool. The contact portion is pressed between the flange and the panel. Further, according to the present invention, in the packing described above, a third contact portion that contacts the opening of the instrument case is provided on the outer periphery of the first contact portion, and the third contact portion is pressed by pressing the front cover portion. The part can be configured to be pressed into the opening of the instrument case.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view (partially shown in side view) showing an embodiment of a waterproof structure according to the present invention.
In FIG. 1, the instrument case 1 has a flange 5 with a predetermined thickness on the outer periphery of the opening 3, and a plurality of external connection terminals 7 on the bottom.
And has a prismatic box shape.

As shown in FIG. 2, the front cover 9 that covers the opening 3 of the instrument case 1 has a pair of upper and lower support pieces 11a and 11b extending toward the rear side.
A plurality of circuit boards (not shown) are supported between 1a and 11b, and the opening 3 of the instrument case 1 is inserted from the circuit board side into the instrument case 1 and the circuit board is connected to the external connection terminals 7. Is blocking. The instrument case 1 and the front cover 9 are molded of, for example, a polycarbonate resin, and in FIG. 1 and FIG. 7 described later, the front cover 9, the support pieces 11a and 11b, and the circuit board are shown in a partial cross section. Has been done.

In the front lid portion 9, those supporting pieces 11
As shown in FIG. 3, short locking pieces 13a and 13b are provided on the support pieces 11 from the central portions of the extended sides of a and 11b.
a and 11b are spaced apart from each other and extend integrally along the locking projections 1a and 11b.
Projections 5a and 15b are provided. In the flange 5 formed in the opening portion 3 of the instrument case 1, the locking pieces 13 are provided at positions corresponding to the locking pieces 13a and 13b of the front cover portion 9.
Flat insertion holes 17a and 17b into which a and 13b are inserted are formed, and locking holes 19a and 1b into which locking protrusions 15a and 15b are locked are formed at the inner sides of these insertion holes 17a and 17b.
9b is formed.

In FIG. 2, the locking piece 13b on the support piece 11b side,
The locking projection 15b and the locking hole 19b are hidden and not visible, and in order to facilitate understanding in FIG. 1, a cross-sectional portion where the locking piece 13b and the insertion hole 17b are removed is shown on the support piece 11b side (FIG. 6). reference). As shown in FIG. 1, an annular step portion 21 is formed in the vicinity of the opening 3 on the inner wall of the flange portion 5 of the instrument case 1 and has a slightly larger diameter toward the end face. The small-diameter corner portion is a wedge-shaped (V-shaped) protrusion 23. Note that, in FIG. 1, the step portion 21 in the vicinity thereof is not clearly shown because the locking piece 13a and the insertion hole 17a are illustrated on the side of the support piece 11a.

At the flange 5 portion of the instrument case 1, a packing 25 that contacts the inner wall and has the tip slightly protruding from the end surface and extends to the rear surface side of the flange 5 (panel 27 side described later) is formed on the flange 5 portion. It is formed so as to be supported by five parts.

The packing 25 is made of, for example, a thermoplastic elastomer, silicone rubber, or the like, which is rich in elasticity and has a good waterproof function.
As shown in FIGS. 4 to 7, it has a front side frame portion 25a, a rear side frame portion 25b, and a plurality of connecting portions 25c for connecting these from chloroprene rubber or the like. 4 and 5
Shows the packing 25 taken out from the flange 5 of the instrument case 1. Front frame part 2 of packing 25
A first contact portion 25d having a wedge-shaped cross section (V-shaped) and having a length slightly protruding from the front end surface of the instrument case 1 is formed in the frame 5a in a frame shape (see FIG. 7). A third contact portion 25e is formed in a frame shape on the outer periphery of the contact portion 25d so as to project obliquely rearward, and the third contact portion 25e is fitted into the protrusion 23 inside the flange 5. Has become.

The back side frame portion 25b of the packing 25 is shown in FIG.
Is in contact with the rear side of the flange 5 as shown in FIG.
Second contact portion 25f having a V-shaped cross-section that contacts the front surface side of 7
(Hidden in FIG. 4) is projected in a frame shape. The instrument case 1 is molded by a predetermined mold, and the packing 25 is made of another mold so that the connecting portion 25c can pass through the through hole 5a provided in the inner wall of the flange 5 as shown in FIG. It is molded from.

Returning to FIG. 1, the instrument case 1 has support fittings 29 on the upper and lower opposite side surfaces near the external connection terminal 7. A screw 31 is screwed into the support fitting 29 along the back surface of the panel 27, and a slender metal pressing plate 33 locked by the screw 31 extends toward the panel 27 to the vicinity of the flange 5 and the screw 31. Rotation of the pressing plate 33
Is the flange 5 or the panel 27 with respect to the support fitting 29.
The pusher 35 is formed so as to move back and forth.

The tip of the pressing plate 33 is bent in an L shape so as to come into surface contact with the panel 27. As shown in FIG. 7, the instrument case having such a configuration has a front cover 9
The locking pieces 13a and 13b of the instrument case 1 into the insertion hole 17 of the instrument case 1.
Inserted so as to be pressed to a and 17b, the locking projections 15a,
When 15b is locked in the locking holes 19a, 19b, as shown in FIG. 1, the first contact portion 25d of the packing 25 is pressed against the back surface of the front lid portion 9 and bent so as to spread to the outer periphery. And the third contact portion 25e is pressed and pressed so as to wrap around the projection 23 of the flange 5.

Further, the instrument case 1 is inserted from the external connection terminal 7 side into the mounting hole 27a of the panel 27, the flange 3 is brought into contact with the front surface side of the panel 27, and the screw 31 of the pressing tool 35 is inserted.
When the rear surface of the panel 27 is pressed by rotating the pressing plate 33, the rear frame portion 25b formed on the rear surface side of the flange 5 is formed.
Is strongly pressed against the flange 5 while the second contact portion 25f is deformed and in close contact with the surface of the panel 27, and the instrument case 1 is fixed to the panel 27 so as to sandwich the panel 27.

In such a waterproof structure of the present invention, the packing 25 is formed by forming the flange 5 around the opening 3 of the instrument case 1 and connecting the front side frame portion 25a and the rear side frame portion 25b by the connecting portion 25c. The front side frame portion 25a is provided with a frame-shaped first contact portion 25d having a wedge-shaped cross-section and slightly protruding from the front end surface of the instrument case 1 on the front surface side frame portion 25a. A second contact portion having a V-shaped cross-section that abuts the front surface side of the panel 27 on the rear frame portion 25b that abuts the rear surface side of the flange 5 by projecting the third abutting portion 25e obliquely rearward on the outer periphery. When 25f is projected in a frame shape and the opening 3 of the instrument case 1 is closed by the front lid portion 9, the back surface of the front lid portion 9 presses the first contact portion 25d while pressing the first contact portion 2d.
When 5d is expanded and bent and the back surface of the panel 27 is pressed by the pressing tool 35, the second contact portion 25f is deformed and tightly contacted with the panel 27, and the third contact portion is further strongly pressed. 25e is pressed firmly and tightly so as to cover the projection 23 on the inner wall of the flange 5.

Therefore, the front cover 9 and the first abutting portion 25d pressed against the front cover 9 provide good waterproofing between the front cover 9 and the inside of the flange 5, and the protrusion 2 of the flange 5 is also achieved.
Good waterproofing between the flange 5 and the packing 25 can be achieved by the third contact portion 25e that is pressed against the pressure roller 3. Further, the second contact portion 25f on the rear surface side of the flange 5 causes the gap between the flange 5 and the packing 25 and between the packing 25 and the panel 27.
Since both sides can also be waterproofed, a good waterproof effect can be obtained between the front lid portion 9, the packing 25, the instrument case 1 and the panel 27 as a whole on the front side of the packing 25.

However, in order to obtain a practical waterproofing effect, the third abutment portion 25 that comes into pressure contact with the projection 23 of the flange 5 is used.
e does not necessarily have to be provided, but the third contact portion 25e
Is provided and pressed against the projection 23 of the flange 5,
You can expect a further waterproof effect. And packing 25
However, the front side frame portion 25a that abuts on the front lid portion 9, the panel 2
Since the back side frame portion 25b that abuts on 7 and the plurality of connecting portions 25c that integrally connect these are formed as one component, the number of components is reduced and the manufacturing is simplified.

By the way, in the above-mentioned embodiment, the pressing tool 35 for pressing the instrument case 1 against the panel 27 is formed by the support fitting 29, the screw 31, and the pressing plate 33, but the pressing tool 35 used in the present invention is not limited to this. There is no limitation, and various known configurations can be implemented. Furthermore, the shape of the packing 25 in the present invention is also the front side frame portion 25a, the rear side frame portion 25b, and the plurality of connecting portions 2 connecting these as described above.
It is not limited to the example formed from 5c.

The point is that the frame-shaped waterproof elastic packing is supported by the instrument case 1, and the frame-shaped first abutting portion is formed along the opening 3 of the instrument case 1 and the tip of which is slightly projecting therefrom. And a second frame-shaped second member formed on the panel 27 side of the flange 5.
It is possible to achieve the object of the present invention by integrally including the contact portion of the above. The cross-sectional shape is not limited to the wedge shape (V shape) as long as the shape is easily deformed by bending.

[0023]

As described above, the waterproof structure for the instrument case according to the present invention is mounted so that the flange provided at the opening is inserted into the mounting hole provided in the instrument mounting panel from the back side and abuts against the panel. The instrument case, the front cover that covers the opening of the instrument case, and the frame-shaped waterproof elastic packing supported by the instrument case, the tip of which protrudes from the inner wall of the opening of the instrument case. And a packing integrally having a frame-shaped first abutting portion and a frame-shaped second abutting portion on the panel side of the flange, and pressing the back side of the panel formed in the instrument case. And a pressing member for fixing the instrument case to the panel between the front cover portion and the flange, and when the front cover portion is covered with the instrument case, the first contact portion is brought into contact with the front cover portion by pressure contact. Is expanded and bent, and the pressing tool Because was configured to press the second contact portion by the pressing of the Le between the flanges and the panel, it is possible to simplify the reduction and manufacturing process of the components with good waterproof effect can be obtained. Further, a third contact portion that contacts the opening of the instrument case is provided on the outer periphery of the first contact portion that projects from the tip of the instrument case,
With the configuration in which the packing is formed such that the third contact portion is pressed against the opening of the instrument case by the pressing of the front cover portion, a further better waterproof effect can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view (partially shown in side view) of a waterproof structure according to the present invention.

FIG. 2 is an exploded perspective view of essential parts for explaining the relationship between the instrument case and the front lid part in FIG.

FIG. 3 is an exploded perspective view of relevant parts for explaining the relationship between the locking piece of the front lid part and the insertion hole of the instrument case in FIG.

FIG. 4 is a perspective view showing a packing in FIG.

5 is a side view (A) and a vertical cross-sectional view (B: cross section between Vb and Vb in FIG. 6) of the packing in FIG.

6 is a cross-sectional view showing a relationship between the flange and the packing in FIG. 7 (a cross section between VI and VI in FIG. 7).

7 is a schematic vertical sectional view showing an assembling step of the waterproof structure according to FIG.

[Explanation of symbols]

1 instrument case 3 openings 5 flange 5a through hole 7 External connection terminal 9 Front lid 11a, 11b support pieces 13a, 13b locking piece 15a, 15b Locking protrusion 17a, 17b insertion hole 19a, 19b Locking hole 21 steps 23 Projection 25 packing 25a Front side frame part 25b Rear frame 25c connecting part 25d 1st contact part 25e Third contact portion 25f Second contact part 27 panels 27a Mounting hole 29 Support bracket 31 screws 33 Press plate 35 Pressing tool

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Hirota 5-16-6 Kugahara, Ota-ku, Tokyo Rika Kogyo Co., Ltd. (56) Reference JP-A-8-334389 (JP, A) JP-A 8-193848 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01D 11/24 G01D 11/30

Claims (2)

(57) [Claims] 1. An instrument case, which has a flange on the outer periphery of the front opening, and is attached so that the flange comes into contact with the panel by being inserted into an attachment hole provided in the instrument attachment panel from the back side, and the instrument case. Of the frame-shaped waterproof elastic packing supported on the instrument case, the front cover part covering the opening part, and the frame-shaped waterproof part having a tip protruding from the inner wall of the opening part of the instrument case. A packing integrally having a first abutting portion and a frame-shaped second abutting portion on the panel side of the flange, and pressing the back side of the panel formed on the instrument case. And a pressing member for fixing the instrument case to the panel so that the instrument case is sandwiched between the flange and the flange, and when the front lid part is covered with the instrument case, the first lid is pressed by the pressure contact. 1 hit Part is expanded bent, the second by pressing the panel by the pusher
The waterproof structure of the instrument case, wherein the abutting portion of is a pressure contact between the flange and the panel. 2. The packing has a third contact portion that contacts the opening of the instrument case on the outer periphery of the first contact portion, and the third contact portion is pressed by the front cover portion. The waterproof structure for the instrument case according to claim 1, wherein the contact portion is pressed against the opening of the instrument case.