JPH1032390A - Waterproof structure for instrument housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure weaterproof function between the housing of a plug-in instrument and a front cover through simple structure and simple manufacturing process. SOLUTION: Opening of a box type case 7 is closed with a front cover 9 to form an instrument housing 1 which is then applied with an elastic frame packing 15 excellent in waterproof function. Bending pieces 29 project outward from the outer circumference of the packing 15. The instrument housing 1 is then inserted into the fixing hole of a panel 17 from the back side and secured to the panel 17 with the packing 15 being sandwiched between the flange 3 of the case 7 and the panel 17. When the cover 11 is applied to the front cover 9, the bending pieces 29 are contained in the containing groove 35 of the cover 11 while being bent toward the panel 17 side by means of the side wall and brought into pressure contact with the side wall.

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 housing, and more particularly to an improvement of a waterproof structure of an instrument housing which is preferably applied 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 case, and a plurality of external connection terminals are formed through the bottom.A plurality of circuit boards are mounted on the back side of the front cover, and inserted into the case from the circuit board side In the state where the circuit board is connected to the external connection terminal, the opening of the case is closed with the front cover to form an instrument housing, and the instrument housing is mounted on the external connection terminal side, that is, from the rear side. While inserting into the hole, the flange of the case is locked to the panel, the pressing plate provided on the case is pressed against the back side of the panel to fix the instrument housing,
A configuration is known in which a flange and a front cover of a case are covered with a cover on the front side of a panel.

In addition, from the viewpoint of ensuring a waterproof function between the instrument housing and the cover, the cover is put on with an elastic body, for example, a rubber packing interposed between the instrument housing and the cover.

[0004]

However, in the waterproof structure of the instrument housing having the above-described structure, the packing is fixed to the case or the front cover of the instrument casing by an adhesive or other fixing means. In addition to the need for a fixing member such as a chemical agent, a packing bonding step is also required during assembly, and from the viewpoint of reducing costs and simplifying manufacturing while maintaining a high waterproofing effect, the number of components and the manufacturing process are reduced. Simplification was desired.

The present invention has been made under such circumstances, and provides a waterproof structure of an instrument housing which can obtain a high waterproof effect, and can easily reduce the number of components and simplify the manufacturing process. With the goal.

[0006]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention provides an instrument housing which is inserted into a mounting hole provided in a panel from the back side, and a panel of the instrument housing. A cover that covers the front part protruding from the panel, and a frame-shaped waterproof elastic packing that is pressed into the outer periphery of the instrument housing at the front side of the panel, covers the cover, and abuts on the panel. This packing has a structure in which a bent piece that is bent toward the panel side and pressed against the inner wall of the cover due to the pressing is provided integrally with the packing.

In the present invention, the front side of the instrument housing, the cover and the packing are preferably formed in a frame shape, and the four corners of the inner wall of the cover with which the bent pieces of the packing come into contact are preferably curved. In addition, the present invention, the bent piece of the packing,
It is preferable to select a shape that fits inside the cover when bent by the pressure of the cover fitted to the instrument housing.

The present invention further provides an annular concave groove formed at the base of the bent piece in the packing, and an annular convex part press-fitted into the concave groove is formed in the cover. It is also possible to form a concave hole on the surface that contacts the panel.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. First, an outline of the waterproof structure of the instrument housing according to the present invention will be described.

FIG. 1 is an exploded perspective view showing an outline of a waterproof structure of an instrument housing according to the present invention. In FIG.
The instrument housing 1 has a box-shaped case 7 having a flange 3 on the outer periphery of the opening and having a plurality of external connection terminals 5 formed through the bottom, and a plurality of circuit boards (hidden and invisible) on the back side. The front cover 9 is formed by closing the opening of the case 7 with the front cover 9 in a state where the circuit board is inserted into the case 7 from the circuit board side and the circuit board is connected to the external connection terminal 5. I have.

The cover 11 has a flat cup shape that covers the flange 3 and the front cover 9 of the case 7 entirely, has an operation window 13, and is formed in a frame shape from, for example, polycarbonate resin. The packing 15 is formed in a frame shape from, for example, silicone rubber, chloroprene rubber, EPR (ethylene propylene rubber), etc., which is rich in elasticity and has a good waterproof function, and is formed on the outer periphery of the case 7 from the bottom, that is, from the external connection terminal 5 side. , Until it comes into contact with the flange 3. Details of the cover 11 and the packing 15 will be described later.

The instrument mounting panel 17 is a panel for operating a conventionally known control device having a mounting hole 19, and the instrument housing 1 is connected to the mounting hole 1 from the external connection terminal 5 side as described later.
9 and supported.

Next, the case 7, the packing 15, and the cover 11 will be described in detail with reference to FIG.
As shown in FIG. 2, the case 7 has a support member 21 on each of the upper and lower opposing side surfaces near the external connection terminal 5, and a screw 23 is screwed into the support member 21 along the side surface of the panel 17. The pressing plate 25 engaged with the screw 23 extends to the vicinity of the flange 3 along the side surface of the panel 17, and the rotation of the screw 23 causes the pressing plate 25 to move forward and backward with respect to the flange 3, that is, the panel 17. I have. The tip of the pressing plate 25 is formed to be bent in an L-shape.

The frame-shaped packing 15 fitted so as to be pressed into the outer periphery of the case 7 has an engaging step 27 which fits on the outer periphery of the flange 3 as shown in FIGS. And covers the outer periphery of the flange 3 and the front cover 9. Then, when the screw 23 provided on the case 7 is turned to slide the pressing plate 25 toward the panel 17, the L-shaped tip is pressed against the back surface of the panel 17 as shown in FIG. So as to compress the packing 15 and sandwich the panel 17 therebetween,
The instrument housing 1 is fixed to the panel 17.

As shown in FIGS. 3 and 4, the packing 15 has a fin-shaped bent piece 29 which is integrally formed so as to protrude from the outer periphery thereof and is formed in an annular shape along the frame shape of the packing 15. I have. As will be described later, when the cover 11 is fitted, the bent piece 29 is bent toward the panel 17 (rearward) and the front end thereof is pressed against the inner wall 35 of the cover. In this case, the tip is formed in a curved shape and is not rectangular, and when the bent piece 29 is bent toward the panel 17 by the cover 11, the bent piece 29 extends over the entire circumference of the bent piece 29.
The protrusion dimension is selected so as not to protrude from the panel 17 side.

In the packing 15, the bent piece 29
A concave groove 31 is formed in an annular shape in the base portion on the thin side of.
The cover 11 is press-fitted into the packing 15 so as to cover the outer periphery of the flange 3 and the front cover 9, and has a shape shown in FIGS. 5 and 6.

That is, the cover 11 is opened as a large-diameter portion in the vicinity of the opening via the step 33, and the inner diameter of this opening is larger than the inner diameter of the operation window 13 side. An annular convex portion 37 protrudes from the inside of the step portion 33 toward the opening and along the inner side wall 35 of the cover 11.
An annular storage groove 39 is formed between the inner wall 7 and the inner wall 35. Moreover, the storage groove 39 is formed along the frame shape of the cover 11, and the inner wall 35 is formed in a curved shape at the four corners B, and is not square.

Therefore, as shown in FIG.
When the cover 11 is covered so as to cover the front cover 9, the bent piece 29 of the packing 15 is accommodated in the storage groove 39, and the tip of the bent piece 29 is bent toward the panel 17 by the inner wall 35, so that the inner wall 35 is formed. While being pressed, the convex portion 37 is pressed into the concave groove 31 of the packing 15. Accordingly, the bent piece 29 of the packing 15 is formed to have a protruding length such that it slightly protrudes from the inner wall 35 of the cover 11 when the bent piece 29 is overlapped with the storage groove 39 of the cover 11.

As shown in FIG. 2, the operation window 13 of the cover 11 is covered with a protective sheet 41 made of, for example, polycarbonate, which is transparent and has good water resistance, and water penetrates through the operation window 13 of the cover 11. Not to be.

The instrument housing having such a configuration is the instrument housing 1.
The packing 15 is inserted from the bottom of the case 7 into the outer periphery of the case 7 until it comes into contact with the flange 3, and is inserted into the mounting hole 19 of the panel 17 from the rear side of the instrument housing 1 as shown in FIG. The panel 17 is brought into contact with the packing 15, and the instrument housing 1 is
On the other hand, the cover 11 is put on the packing 15 so as to cover the flange 3 and the front cover 9, and the convex portion 37 of the cover 11 is pressed into the concave groove 31 of the packing 15 and the bent piece 29 is pressed into the storage groove 39. And assembled.

As described above, when the cover 11 is pressed into the packing 15 so as to cover the flange 3 and the front cover 9, FIG.
As shown in FIG.
And the bent piece 29 is bent toward the panel 17 by the inner wall 35 over the entire circumference, so that the inner wall 35
While the convex portion 37 and the concave groove 31 are pressed. Therefore, when attention is paid to between the cover 11 and the packing 15, the bent piece 29 of the packing 15 is
5, the convex portion 37 and the concave groove 31 are pressed against each other, and the waterproof effect between the cover 11 and the packing 15 is enhanced. The waterproof effect of the portion 9 is obtained.

Then, the packing 15 only needs to be inserted into the outer periphery of the instrument housing 1, and is pressed against the panel 17 in the process of fixing the instrument housing 1 to the panel 17, and the cover 11 is attached to the flange 3 or the front cover 9. Since it is only necessary to cover it so as to be pressed, it has a simple structure, does not require an adhesive or the like, and is easy to assemble. Moreover, the bent piece 29 of the packing 15 is
Since the four corners A are formed in a curved shape and are not square, they are easily adhered to the inner wall 35 of the storage groove 39 of the cover 11.

Further, since the inner side wall 35 of each of the four corners B of the storage groove 39 of the cover 11 is formed in a curved shape and is not rectangular, the degree of close contact with the bent piece 29 of the packing 15 is high, and And the degree of adhesion between the bent pieces 29 of the packing 15 is high. When the bent piece 29 of the packing 15 is bent toward the panel 17 by the cover 11, if the bent piece 29 is selected so as not to protrude from the cover 11, the space between the cover 11 and the bent piece 29 of the packing 15 can be increased. Water is hard to enter.

Further, in the waterproof structure of the instrument housing of the present invention, in addition to the storage groove 39 of the cover 11 and the bent piece 29 of the packing 15, the convex portion 37 of the cover 11 and the concave groove 31 of the packing 15 further enhance the structure. Although a waterproof effect can be expected, the convex portion 37 of the cover 11 and the concave groove 31 of the packing 15 are not necessarily required.

By the way, if the flat portion of the packing 15 is simply brought into contact with the panel 17, there is no fear that water may enter between the packing 15 and the panel 17 due to the capillary phenomenon. Therefore, as shown in FIG.
In this case, by providing a plurality of small blind holes 43 on the contact surface with the panel 17, it would be possible to suppress the intrusion of water due to capillary action.

[0026]

As described above, the waterproof structure of the instrument casing according to the present invention is such that a frame-shaped waterproof elastic packing is pressed into the outer periphery of the instrument casing, and the rear side is inserted into the mounting hole provided in the panel. The instrument housing is attached to the panel so that the packing is sandwiched between them, and the cover is press-fitted so as to cover the packing to cover the front side of the instrument housing, and the bent piece provided in the packing is pressed into the cover It is bent to the panel side and is pressed against the inside of the cover, so that simply pressing the packing around the outer periphery of the instrument housing and covering the instrument housing with the cover by pressing it in gives a high waterproof effect, and the configuration The number of parts can be reduced, and the manufacturing process can be easily simplified. Then, the front side of the instrument housing, the cover and the packing are formed in a frame shape, the corner portion of the inner wall of the cover abutting the packing is curved, or the bent piece of the packing is fitted to the instrument housing. If the shape is selected so as to fit within the cover when bent by pressing the cover, a further waterproof effect can be obtained. Further, in a configuration in which an annular concave groove is formed in the packing and an annular convex portion press-fit into the concave groove is formed in the cover, a higher waterproof effect can be expected.

[Brief description of the drawings]

FIG. 1 is a schematic exploded perspective view of a waterproof structure of an instrument housing according to the present invention.

FIG. 2 is a sectional view showing an embodiment of the waterproof structure of FIG.

FIG. 3 is a plan view showing the packing of FIG. 1;

FIG. 4 is a sectional view showing the packing of FIG. 3 (IV- in FIG. 3);
IV section).

FIG. 5 is a plan view showing the cover of FIG. 1;

FIG. 6 is a sectional view (VI-V in FIG. 5) showing the cover of FIG. 5;
I section).

FIG. 7 is a perspective view showing an assembling step of the waterproof structure of FIG. 1;

FIG. 8 is a sectional view showing a main part of the waterproof structure of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Instrument housing 3 Flange 5 External connection terminal 7 Case 9 Front cover 11 Cover 13 Operation window 15 Packing 17 Panel 19 Mounting hole 21 Support metal 23 Screw 25 Press plate 27 Engagement step 29 Bent piece 31 Depressed groove 33 Step 35 inner wall 37 convex part 39 storage groove 41 protective sheet 43 blind hole

Claims (5)

[Claims] 1. An instrument housing which is inserted into a mounting hole provided in an instrument mounting panel from the rear side and is attached to the panel; a cover for covering a front portion of the instrument housing which protrudes from the panel; A frame-shaped waterproof elastic packing that is pressed into the outer periphery of the instrument housing on the front side of the instrument housing, covers the cover, and abuts the panel, and is bent toward the panel side by pressing the cover. And a packing integrally having a bent piece pressed against the inner wall of the cover. 2. The front face of the instrument housing, the cover and the packing are formed in a frame shape, and four corners of the inner wall of the cover with which the bent pieces of the packing come into contact are curved. Instrument case waterproof structure. 3. The instrument housing according to claim 1, wherein the bent piece of the packing is selected to have a shape that fits inside the cover when the cover is bent by pressing the cover fitted to the instrument housing. Waterproof structure. 4. The packing according to claim 1, wherein an annular groove is formed at a base of the bent piece, and the cover is formed with an annular protrusion which is pressed into the groove. The waterproof structure of the instrument housing according to claim 1. 5. The waterproof structure of an instrument housing according to claim 1, wherein a recess is formed in a surface of the packing that contacts the panel.