JPH08210506A - Waterproof structure between case and cover - Google Patents

Abstract

(57) [Abstract] [Purpose] The opening end face of the case is closed by mounting the cover in a watertight manner and without damaging the sealing member. [Structure] A flange 21 near the open end of a case 20 has an inner root surface 24 and an outer peripheral surface 22 with a step surface 23 in the depth direction interposed therebetween. At the open end of the case 20, an outer peripheral surface 25 is formed so as to be connected to the open end surface 26 and the root surface 24 at a right angle. The cover 30 has a contact surface 32 that abuts the peripheral edge surface 22 on the flange side when mounted on the case 20, a first inner peripheral surface 33 that partially opposes the step surface 23 on the flange side, and a flange side. There are a pressing surface 34 opposed to the root surface 24, a second inner peripheral surface 35 partially opposed to the case-side outer peripheral surface 25, and a bottom surface 36 opposed to the case-side open end surface 26. Ring-shaped sealing member with circular cross section
40 is fitted to the outer peripheral surface 25 on the case side and pressed between the root surface 24 on the flange side and the pressing surface 34 on the cover side, and between the outer peripheral surface 25 on the case side and the first inner peripheral surface 33 on the cover side. ,
The case 20 and the cover 30 are watertightly closed.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a watertight structure between a case and a cover for closing an opening end face of a case having a cylindrical peripheral wall in a watertight manner by mounting a cover from the front side.

2. Description of the Related Art One conventional example will be described below with reference to the drawings. One conventional example is a panel-mounted temperature setter. The conventional example as the temperature setting device is installed and used at a work site where the humidity is extremely high and water drops are generated and adhere. FIG. 7 is a cross-sectional view of a conventional example, the main part of which is a case 11 having a rectangular cylindrical shape and a cover 12.
The cover 12 includes a setting operation unit with no reference sign on the front side, a printed wiring board with no reference sign on the middle part, and a base 15 on the back side, and as a whole, an opening part on the left side of the case 11 is provided. To the right from the base 15
The hooks provided on the upper and lower edges of the case 11 are fixed to the right end surface of the case 11 by hooking. The cover 12 is provided with a rectangular ring-shaped sealing member 13 having a circular cross section in a groove formed at a position corresponding to the left end surface of the case. Cover 1 case 1
At the final stage of insertion into 1, the sealing member 13 is pressed by the groove of the cover 12 and the left end surface of the case 11, and this portion is watertightly closed to form a waterproof structure. The waterproof structure is as follows. The sealing member 1 is provided in the groove on the right end surface of the cover 12.
3 is attached in a form of being fitted. This sealing member 13
Is a rubber member having a rectangular ring-shaped cross section. When the cover 12 is attached to the case 11, the sealing member 13 press-contacts with the inner surface of the groove of the cover 12 and the left end surface of the case 11, and seals this portion in a watertight manner. Next, referring to FIG. 7, the case 11 and the cover 12
Are integrally attached to the panel 7. This installation is
The sealing member 6 formed as a rectangular ring-shaped plate is inserted between the front surface of the panel 7 and the front surface of the panel 7 to provide a waterproof structure for the inside of the panel 7, and the attachment 8 is used. FIG.
As shown in the perspective view of FIG.
A hole for inserting the case 11 is made in the central portion, and the upper and lower edges of the hole are cut and bent to form the claw portion.
When the case 11 is inserted from the front side of the panel 7 and positioned at the final stage, the tips of the claws are engaged with the serrated latches 11c formed on the upper and lower surfaces of the case 11, and the case 1
1 can be fixed to the panel 7 (see FIG. 7). When the case 11 is removed from the panel 7, the claw portion of the fixture 8 is removed from the latch 11c from the back side. Now, the waterproof structure of the conventional example using the sealing member 13 has the advantage of being simple and easy to manufacture, but has a slight problem in the effect of closing in a watertight manner. That is, in FIG. 7, when the sealing member 13 and the left side surface of the case 11 are in pressure contact with each other when viewed in cross section, only one surface contact makes the reliability against waterproofing inevitably lower. Another conventional example will first be described in its entirety with reference to a partially cutaway side view of another conventional example shown in FIG. Another conventional example is different from the conventional example in the structure of the case 1 and the cover 2 corresponding to the cover, which is closed in a watertight manner, and the shape of the sealing member 3 inserted therein. The other members are the same as those in the conventional example, and therefore are denoted by the same reference numerals. Latch 1 formed on the upper and lower surfaces of case 1
c (only the upper surface is shown in the figure) is substantially the same as the latch 11c of one conventional example (see FIGS. 7 and 8). FIG. 5 is a sectional view of a main part of another conventional example, that is, a closed portion. In FIG. 5, a flange 1A that projects outward is provided near the opening end surface of the cylindrical peripheral wall of the case 1.
The flange surface 1a, which is the surface of the flange 1A, and the outer peripheral surface 1b of the cylindrical peripheral wall of the case 1 are surfaces that contact the sealing member 3 on the case 1 side. The surfaces of the other cover 2 that come into contact with the sealing member 3 are the inner peripheral surface 2b and the bottom surface 2c of the groove portion formed corresponding to the cylindrical peripheral wall of the case 1. Here, the flange surface 1a of the case 1 and the bottom surface 2 of the cover 2
c is opposed to the outer peripheral surface 1b of the case 1 at a right angle,
The inner peripheral surface 2b of the cover 2 faces. The sealing member 3 shown in a perspective view in FIG. 6 is inserted into a ring-shaped space having a rectangular cross section surrounded by these surfaces. This sealing member 3
Is a rectangular plate having a rectangular ring shape. Returning to FIG. 5, the sealing member 3 is fitted around the outer peripheral surface 1b of the case 1 in a wound manner. When the cover 2 is attached to the case 1, the sealing member 3 has its cross-section facing short side portions, respectively, of the flange surface 1 of the case 1.
a, the bottom surface 2c of the cover 2 is contacted and pressed, and by this pressing, it is bent upwardly. Due to the bending of the sealing member 3, the upper surface thereof simultaneously comes into pressure contact with the inner peripheral surface 2b of the cover 2 and the lower surface thereof comes into pressure contact with the outer peripheral surface 1b of the case 1. As a result, waterproofing is performed between the case 1 and the cover 2.

In another conventional example shown in FIG. 5, water entering through the contact gap between the flange surface 1a and the contact surface 2a directly contacts the sealing member 3 and is damaged. There is a drawback that the left end portion of the sealing member 3 may be pinched between the bottom surface 2c of the cover 2 and the opening end surface of the case 1 and mechanically damaged. The problem to be solved by this invention is
To provide a structure that solves the above problems of the conventional technique and that closes the opening end surface of a case having a cylindrical peripheral wall from the front side by mounting a cover in a watertight manner and without damaging the sealing member. It is in.

The present invention has a structure in which an opening end surface 26 of a case 20 having a cylindrical peripheral wall is closed in a watertight manner by mounting a cover 30 from the front side, and the case 20 comprises:
It projects outward near the opening end of the peripheral wall, and the front flange surface sandwiches the step surface 23 in the depth direction and the inner root surface 24.
And a flange 21 formed of an outer peripheral surface 22; and an outer peripheral surface 25 that connects the opening end surface 26 and the root surface 24 at a right angle; and when the cover 30 is attached to the case 20, the cover 30 has a peripheral surface on the flange side.
An abutment surface 32 that abuts 22; a first inner peripheral surface 33 that is connected to the abutment surface 32 at a right angle and that partially opposes the step surface 23 on the flange side; a right angle to the first inner peripheral surface 33 A pressing surface 34 connected to the root surface 24 on the flange side; and a second inner peripheral surface 35 connected to the pressing surface 34 at a right angle and partially facing the outer peripheral surface 25 on the case side; The ring-shaped sealing member 40 is fitted to the outer peripheral surface 25 on the case side, and has the bottom surface 36 connected to the second inner peripheral surface 35 at a right angle and facing the opening end surface 26 on the case side. When installed on 20, the root side of the flange side
24 ・ Between pressing surfaces 34 on the cover side, and outer peripheral surface 25 on the case side
-The structure is such that they are pressed between the first inner peripheral surfaces 33 on the cover side. Further, the ring-shaped sealing member 40 preferably has a circular cross section.

In the present invention, the ring-shaped sealing member 40 is fitted on the outer peripheral surface 25 at the opening end of the case peripheral wall. In this state, when the cover 30 is mounted from the front side, the ring-shaped sealing member 40
Are pressed between the base surface 24 on the flange side and the pressing surface 34 on the cover side, and between the outer peripheral surface 25 on the case side and the first inner peripheral surface 33 on the cover side, in other words, pressing on each of the four sides. Due to the contact, the case 20 and the cover 30 are watertightly closed. Moreover, the degree of compression of the sealing member 40 is limited to a certain limit by the contact between the peripheral surface 22 of the flange 11 and the contact surface 32 on the cover 30 side. Further, the water that has entered through the contact gap between the peripheral surface 22 and the contact surface 32 is once blocked by the step surface 23, and the outer peripheral surface 25 and the second inner peripheral surface 35 partially overlap each other. Even if the left-hand side portion of the is protruding, unlike the conventional example, it is not caught between the opening end face 26 and the bottom face 36.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a waterproof structure between a case and a cover according to the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view of a main part of the embodiment, that is, a waterproof structure part. In FIG. 1, the flange 21 projects near the open end of the case 20. The flange 21 has a front flange surface composed of an inner root surface 24 and an outer peripheral surface 22 with a step surface 23 in the depth direction therebetween. At the open end of the case 20, an outer peripheral surface 25 is formed so as to be connected to the open end surface 26 and the root surface 24 at a right angle.
There is. One cover 30 is on the side to be attached to the case 20,
Carved in two steps. That is, as the end surface on the mounting side, when mounted on the case 20, the peripheral surface on the flange side
It has an abutment surface 32 that abuts 22. As the first step of engraving, the first inner peripheral surface 33 that is connected to the contact surface 32 at a right angle and partially faces the step surface 23 on the flange side, and the first inner peripheral surface 33
There is a pressing surface 34 that is connected to the inner peripheral surface 33 at a right angle and faces the root surface 24 on the flange side. As a second step of engraving, a second inner peripheral surface 35, which is connected at a right angle to the pressing surface 34 and partially faces the outer peripheral surface 25 on the case side, is connected at a right angle to the second inner peripheral surface 35. There is a bottom surface 36 facing the opening end surface 26 on the case side. The ring-shaped sealing member 40 having a circular cross section shown in the perspective view of FIG. 2 is fitted to the outer peripheral surface 25 on the case side in FIG. Therefore, when the cover 30 is attached to the case 20, the cover 30 is pressed between the base surface 24 on the flange side and the pressing surface 34 on the cover side, and between the outer peripheral surface 25 on the case side and the first inner peripheral surface 33 on the cover side. . In this way, the case 20 and the cover 30 are water-tightly closed via the sealing member 40 that is in pressure contact with each of the four sides. Moreover, with the peripheral surface 22 of the flange 11,
The contact of the contact surface 32 on the cover 30 side limits the degree of compression of the sealing member 40 to a certain limit. Further, the water that has entered through the contact gap between the peripheral surface 22 and the contact surface 32 is once blocked by the step surface 23, so that there is little risk of directly contacting the sealing member 40 and damaging it. Further, since the outer peripheral surface 25 and the second inner peripheral surface 35 partially overlap each other, even if the left side portion of the sealing member 40 protrudes, there is no risk of being pinched between the opening end surface 26 and the bottom surface 36 and being damaged. FIG. 3 is a partially cutaway side view of the embodiment.
The structure of the mounting position of the cover 30 and the case 30 is the same as the main part of the embodiment of FIG. 1 described above. The case 20 is inserted into the hole of the panel 7 in such a manner that the flange 21 presses the panel 7 via the sealing member 6, and the same claw portion (see FIG. 8) of the fixture 8 as in the conventional example is used. It is fixed to the panel 7 by engaging with saw-like latches 20c formed on the upper and lower surfaces of the case 20.

According to the present invention, the following excellent effects can be expected. (1) It is possible to obtain a structure in which the opening end face of a case having a cylindrical peripheral wall is watertightly closed by mounting a cover from the front side. (2) The sealing member is very unlikely to be damaged. The reason is that first, the degree of compression of the sealing member is limited to a certain limit due to the contact between the peripheral surface of the flange and the contact surface on the cover side.
Secondly, since water that has entered through the contact gap between the peripheral surface and the contact surface is once blocked by the step surface, there is little risk of directly contacting the sealing member and being damaged. This is because the inner peripheral surfaces partially overlap with each other, so that even if a part of the sealing member protrudes, the inner peripheral surface is not sandwiched between the opening end surface and the bottom surface unlike another conventional example. (3) Since the sealing member having a circular cross section is used, it is easy to manufacture and purchase, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment according to the present invention.

FIG. 2 is a perspective view of a sealing member according to an embodiment.

FIG. 3 is a partially cutaway side view of the embodiment.

FIG. 4 is a partially cutaway side view of another conventional example.

FIG. 5 is a sectional view of a main part of another conventional example.

FIG. 6 is a perspective view of a sealing member in another conventional example.

FIG. 7 is a partially cutaway side view of a conventional example.

FIG. 8 is a perspective view showing a panel mounting of a conventional example.

[Explanation of symbols]

 20 case 21 flange 22 peripheral surface 23 step surface 24 root surface 25 outer peripheral surface 26 opening end surface 30 cover 32 contact surface 33 first inner peripheral surface 34 pressing surface 35 second inner peripheral surface 36 bottom surface 40 sealing member

Claims (2)

[Claims] 1. An open end surface (26) of a case (20) having a cylindrical peripheral wall.
The case (20) has a structure in which it is watertightly closed from the front side by mounting the cover (30). The inner root surface (24) and the outer peripheral surface (2
Flange (21) consisting of 2); open end face (26) and root face (24)
An outer peripheral surface (25) that is connected to and at a right angle, and a cover (30)
When installed in the case (20), the flange side peripheral surface (2
An abutment surface (32) that abuts 2); and a first inner peripheral surface (33) that is connected to the abutment surface (32) at a right angle and that partially faces the step surface (23) on the flange side; A pressing surface (34) connected to the first inner peripheral surface (33) at a right angle and facing the root surface (24) on the flange side;
Peripheral surface (25) connected to this pressing surface (34) at a right angle and on the case side
A second inner peripheral surface (35) partially opposed to the second inner peripheral surface (35); and a bottom surface (36) connected to the second inner peripheral surface (35) at a right angle and facing the opening end surface (26) on the case side. The ring-shaped sealing member (40) is fitted to the outer peripheral surface (25) on the case side, and the cover (30) is attached to the case (2
When mounted on (0), between the base surface (24) on the flange side and the pressing surface (34) on the cover side, and between the outer peripheral surface (25) on the case side and the first inner peripheral surface (33) on the cover side, respectively. Waterproof structure between case and cover characterized by being pressed. 2. The waterproof structure between a case and a cover according to claim 1, wherein the ring-shaped sealing member (40) has a circular cross section.