JPH11160115A - Water-proof structure of instrument case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a water-proof function among a front cover part, an instrument case, and an installation panel with a simple structure and manufacture in a plug-in type instrument. SOLUTION: A flange 5 is installed on the periphery of an opening part 3 of an instrument case 1. A frame type water-proof elastic packing 25 is supported by the flange 5 part of the instrument case 1. The packing 25 is provided integrally with a first abutting part 25d projected from the opening part 3 of the instrument case 1 and a second abutting part 25f formed on a panel 27 of the flange 5. When the opening part 3 of the instrument case 1 is covered pressingly with a front cover part 9, the first abutting part 25a is bent expandably by the front cover part 9. By the depression of a presser tool 35 onto the backside of the panel 27, the second abutting part 25f is press- contacted between the flange 5 and the panel 27, and the instrument case 1 can be fixed to the panel 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure of an instrument case, and more particularly to an improvement of a waterproof structure suitable for application to a plug-in type instrument.

[0002]

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

In addition, conventionally, from the viewpoint of ensuring the waterproof function between the instrument case and the front cover, and between the instrument case and the panel, both the instrument case and the front cover and between the instrument case and the panel are provided. The instrument case has been fixed to the panel with separate elastic members, for example, rubber packings interposed therebetween.

[0004]

However, in the waterproof structure having the above-described structure, it is necessary to fix a separate packing between the front cover and the flange of the instrument case or between the flange and the panel by using an adhesive or other fixing means. Because there was
In addition to the need for separate packings with different shapes,
An operation of bonding these packings to a plurality of locations with an adhesive or the like is required, and improvements have been desired from the viewpoint of reducing costs and simplifying manufacturing. Furthermore, simply placing the packing between the instrument case and the front lid or on the back side of the flange does not necessarily result in a high waterproof effect, 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 that is inexpensive and easy to manufacture, while achieving good waterproofing effects, reducing the number of components 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 is inserted from the rear side into a mounting hole provided in the panel so that the flange contacts the panel. An instrument case attached so as to be in contact with the instrument case, a front cover part of the instrument case covering the opening, and a frame-shaped waterproof elastic packing supported by the instrument case; A packing integrally having a frame-shaped first contact portion whose tip projects from the inner wall, a frame-shaped second contact portion formed on the panel side of the flange, and an instrument case thereof. And a pressing tool that presses the rear surface of the panel and fixes the instrument case to the panel between the panel and the flange.

Further, when the front cover is put on the instrument case, the first contact portion is expanded and bent by the pressure contact of the front cover, and the second contact is pressed by the pressing tool against the panel. The contact portion is configured to be pressed between the flange and the panel. Further, the present invention provides the packing, wherein a third contact portion is provided on an outer periphery of the first contact portion, the third contact portion being in contact with an opening of the instrument case, and the third contact portion is pressed by a front cover portion. The part can be configured to be pressed against the opening of the instrument case.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view (partly 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 of a predetermined thickness on the outer periphery of the opening 3 and a plurality of external connection terminals 7 on the bottom.
And is formed in a prismatic box shape.

As shown in FIG. 2, the front cover 9 which 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 into the instrument case 1 from the circuit board side and the circuit board is connected to the external connection terminal 7. Is blocking. The instrument case 1 and the front cover 9 are formed of, for example, a polycarbonate resin. In FIG. 1 and FIG. 7 described below, the front cover 9, the support pieces 11a and 11b, and the circuit board are shown in a partial cross section in an integrated state. Have been.

In the front cover 9, the supporting pieces 11
As shown in FIG. 3, short locking pieces 13a and 13b are attached to the supporting pieces 11a and 11b from the central portions of the extended sides of the supporting pieces 11a and 11b.
a, 11b and extend integrally therewith at a slight interval, and a locking projection 1 is provided on the outer end of the locking pieces 13a, 13b.
5a and 15b are protruded. In the flange 5 formed in the opening 3 of the instrument case 1, the locking pieces 13 a and 13 b of the front lid 9 are located at positions corresponding to the locking pieces 13 a and 13 b.
a, 13b into which flat insertion holes 17a, 17b are formed. Lock holes 19a, 1b, into which the locking projections 15a, 15b are locked, are located behind these insertion holes 17a, 17b.
9b is formed.

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

A packing 25 is provided on the flange 5 of the instrument case 1 so as to be in contact with the inner wall of the instrument case 1, the tip of which protrudes slightly from the end face and extends to the rear side of the flange 5 (toward a panel 27 described later). It is molded 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 highly elastic and has a good waterproof function.
As shown in FIG. 4 to FIG. 7, a front frame 25a, a rear frame 25b, and a plurality of connecting portions 25c connecting these are made of chloroprene rubber or the like. 4 and 5
Is a drawing of the packing 25 taken out from the flange 5 of the instrument case 1. Front side frame 2 of packing 25
5a is formed with a frame-shaped first contact portion 25d having a length slightly protruding from the front end surface of the instrument case 1 and having a wedge-shaped (V-shaped) cross section (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 protrude obliquely rearward, and the third contact portion 25e is fitted into the protrusion 23 inside the flange 5. Has become.

The rear frame 25b of the packing 25 is shown in FIG.
Abuts on the rear side of the flange 5 as shown in FIG.
7, a second contact portion 25f having a V-shaped cross section that contacts the front surface side
(Hidden in FIG. 4) is projected in a frame shape. The instrument case 1 is formed with a predetermined mold, and the packing 25 is formed of a waterproof elastic material as described above in another mold so that the connecting portion 25c passes through a through hole 5a provided in the inner wall of the flange 5 as shown in FIG. Molded from.

Returning to FIG. 1, the instrument case 1 has supporting brackets 29 on the upper and lower opposing 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. An elongated metal pressing plate 33 locked by the screw 31 extends toward the panel 27 near the flange 5, and the screw 31 The rotation of the pressing plate 33
Is the flange 5, that is, the panel 27 with respect to the support fitting 29.
, And a pressing tool 35 is formed.

The distal end of the pressing plate 33 is bent in an L-shape so as to make surface contact with the panel 27. The instrument case having such a configuration is, as shown in FIG.
The locking pieces 13a and 13b of the instrument case 1
a, 17b to be pressed against and inserted into the locking projections 15a,
When the lock 15b is locked in the lock 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 cover 9 and bent so as to expand to the outer periphery. The third contact portion 25e is pressed in a tightly contacted state so as to wrap around the protrusion 23 of the flange 5 while being pressed tightly in a tightly contacted state.

Further, the instrument case 1 is inserted into the mounting hole 27a of the panel 27 from the external connection terminal 7 side so that the flange 3 is brought into contact with the surface of the panel 27, and the screw 31 of the pressing tool 35
Is rotated and the back surface of the panel 27 is pressed by the pressing plate 33, so that the back side frame portion 25b formed on the back side of the flange 5 is formed.
Is strongly pressed against the flange 5 in a state where the second contact portion 25f is in close contact with the surface of the panel 27 while being deformed, 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, a flange 5 is formed on the outer periphery of the opening 3 of the instrument case 1, and the packing 25 in which the front side frame part 25a and the rear side frame part 25b are connected by the connecting part 25c is used. A first abutting portion 25d having a wedge-shaped cross-section and slightly projecting from the front end surface of the instrument case 1 is formed in a frame shape on the front side frame portion 25a. A third contact portion 25e is projected obliquely rearward on the outer periphery, and a second contact portion having a V-shaped cross section that contacts the front surface side of the panel 27 is provided on the rear frame portion 25b that contacts the rear surface of the flange 5. When the front cover 9 closes the opening 3 of the instrument case 1 with the front cover 9 closed, the back surface of the front cover 9 presses the first contact portion 25d and presses the first contact portion 2d.
5d is expanded and bent, and when the back surface of the panel 27 is pressed by the pressing tool 35, the second contact portion 25f is deformed and closely adhered to the panel 27 so as to be strongly pressed, and further, the third contact portion 25f is pressed. 25e is tightly pressed so as to cover the projection 23 of the inner wall of the flange 5.

Therefore, good waterproofing between the front cover 9 and the inside of the flange 5 is achieved by the front cover 9 and the first contact portion 25d pressed against the front cover 9, and the protrusion 2 of the flange 5 is provided.
By the third contact portion 25e pressed against the third member 3, good waterproof between the flange 5 and the packing 25 can be achieved. Further, the second abutting portion 25f on the rear side of the flange 5 allows the flange 5 to be located between the packing 25 and between the packing 25 and the panel 27.
Since waterproofing between both sides can be ensured, a good waterproofing effect can be obtained as a whole between the front cover 9, the packing 25, the instrument case 1 and the panel 27 on the front side of the packing 25.

However, in order to obtain a practical waterproof effect, the third contact portion 25 which presses against the projection 23 of the flange 5 is required.
e is not necessarily provided, but the third contact portion 25e
Is provided and pressed against the protrusion 23 of the flange 5,
A more waterproof effect can be expected. And packing 25
Is a front side frame portion 25a in contact with the front cover portion 9, a panel 2
7 is formed as a single component from the back side frame portion 25b abutting on and the plurality of connecting portions 25c that integrally connect them, so that the number of components is reduced and the manufacturing is simplified.

In the above-described 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. The present invention is not limited thereto, and can be implemented with various known configurations. Further, as described above, the shape of the packing 25 in the present invention also includes the front side frame portion 25a, the back side frame portion 25b, and the plurality of connecting portions 2 connecting these.
It is not limited to the example formed from 5c.

The gist is a frame-shaped waterproof elastic packing supported by the instrument case 1, and the frame-shaped first contact portion whose tip slightly projects along the opening 3 of the instrument case 1. And a second frame formed on the panel 27 side of the flange 5.
The object of the present invention can be achieved if the contact portion is integrally provided. The cross-sectional shape is not limited to a wedge shape (V-shape), and any shape may be used as long as it is easily curved and deformed.

[0023]

As described above, the waterproof structure of the instrument case according to the present invention is mounted on the instrument mounting panel so as to be inserted into the mounting hole provided on the instrument mounting panel from the rear side so that the flange provided at the opening comes into contact with the panel. An instrument case, a front lid covered so as to cover the opening of the instrument case, and a frame-shaped waterproof elastic packing supported by the instrument case, the tip protruding from the inner wall of the opening of the instrument case. A packing integrally formed with a frame-shaped first contact portion, a frame-shaped second contact portion formed on the panel side of the flange, and a press formed on the instrument case to press the rear surface of the panel. And a pressing member for fixing the instrument case to the panel between the instrument case and the flange. When the front cover is put on the instrument case, the first contact portion is pressed by the front cover to form the front cover. To be expanded and bent 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. In addition, a third contact portion that contacts the opening of the instrument case is provided on the outer periphery of the first contact portion that protrudes from the tip of the instrument case,
In the configuration in which the packing is formed such that the third contact portion is pressed against the opening of the instrument case by pressing the front cover portion, an even better waterproof effect can be obtained.

[Brief description of the drawings]

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

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

FIG. 3 is an exploded perspective view of a main part for explaining a relationship between a locking piece of a front cover and an insertion hole of an instrument case in FIG. 1;

FIG. 4 is a perspective view showing a packing in FIG. 1;

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

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

FIG. 7 is a schematic longitudinal sectional view showing an assembling step of the waterproof structure according to FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Instrument case 3 Opening 5 Flange 5a Through-hole 7 External connection terminal 9 Front cover 11a, 11b Supporting piece 13a, 13b Locking piece 15a, 15b Locking projection 17a, 17b Insertion hole 19a, 19b Locking hole 21 Step 23 Projection 25 Packing 25a Front side frame 25b Back side frame 25c Connecting part 25d First contact part 25e Third contact part 25f Second contact part 27 Panel 27a Mounting hole 29 Support bracket 31 Screw 33 Pressing plate 35 Pressing tool

Continuation of front page (72) Inventor Norio Hirota 5-16-6 Kugahara, Ota-ku, Tokyo Inside Rika Kogyo Co., Ltd.

Claims (2)

[Claims] 1. An instrument case having a flange on the outer periphery of an opening on a front face, inserted into a mounting hole provided in an instrument mounting panel from a rear side, and mounted so that the flange abuts on the panel. A front lid covered so as to cover the opening, and a frame-shaped waterproof elastic packing supported by the instrument case, wherein a frame-shaped tip is protruded from an inner wall of the instrument case opening. A packing integrally having a first contact portion and a second contact portion formed in a frame shape on the panel side of the flange; and a pressing portion formed on the instrument case and pressing a back side of the panel. A pressing tool for fixing the instrument case to the panel between the flange and the flange, and wherein the front cover is pressed against the instrument case when the front cover is covered with the instrument case. One of this Part is expanded bent, the second by pressing the panel by the pusher
Wherein the contact portion is pressed between the flange and the panel. 2. The packing according to claim 1, further comprising a third abutting portion which is provided on an outer periphery of said first abutting portion and abuts on an opening of said instrument case, said third abutting portion being pressed by said front cover. The waterproof structure for an instrument case according to claim 1, wherein a contact portion is pressed against an opening of the instrument case.