JPH08250204A - Rubber cap - Google Patents

Abstract

PURPOSE: To prevent a large gap from being generated due to the displacement of an angular part. CONSTITUTION: In inner angular parts of hood part 22 covering the side surface of a connector housing in a rubber boot 20 to which a rubber cap is applied, when a connector housing having angular parts is installed and even when the angular parts are displaced with each other. the displacement can be absorbed by a cavity part because the circular thickness removing part 22a is formed. The inner surface of the hood 22 adjacent to the cavity part 22a is brought into close contact with the peripheral surface of the connector housing without a gap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber cap,
In particular, the present invention relates to a rubber cap suitable for use as a rubber boot in a connector housing or the like.

[0002]

2. Description of the Related Art Conventionally, as a rubber boot for a connector to which a rubber cap of this kind is applied, those shown in FIGS. 7 to 9 are known. The connector housing 1 is formed in a substantially rectangular box shape and has corners at four corners. Further, a plurality of through-hole-shaped terminal fitting housing chambers 1a capable of housing the terminal fittings are arranged in parallel in the same direction, and a flange 1b is formed on the peripheral edge of the end portion.

On the other hand, the rubber boot 2 can cover the opening surface and the peripheral edge portion of the terminal fitting housing chamber 1a, and the flange 1b can be forcibly inserted into the inner peripheral surface of the opening edge that covers the peripheral edge portion. The groove 2a is formed. The operator extends the open end of the rubber boot 2 and forcibly inserts the flange 1b larger than the open end into the annular groove 2a, and mounts the rubber boot 2 on the connector housing 1 as shown in FIG.

[0004]

In the above-mentioned conventional rubber cap, if the connector housing 1 and the corner of the rubber boot 2 do not match in character, a gap is formed on the surface adjacent to the corner as shown in FIG. There was a problem that it would occur. The present invention has been made in view of the above problems, and an object of the present invention is to provide a rubber cap capable of preventing a large gap from being generated due to a shift of a corner portion.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 has an opening which substantially coincides with the outer shape of a housing having a corner, and covers one surface of the housing from the opening. The rubber cap is formed by removing the corners of the inner peripheral surface.

According to a second aspect of the present invention, in the rubber cap according to the first aspect, a recess is formed on the inner peripheral surface over the entire circumference, and a fold-shaped inner lip is formed from the recess toward the inner peripheral side. The protruding portion is formed so that the lightening portion of the corner portion and the inner lip intersect each other.

[0007]

In the invention according to claim 1 configured as described above, since the corner portion of the inner peripheral surface of the rubber cap is formed by cutting out the thickness, when the housing is inserted into the opening of the rubber cap, the housing The corner portion of the rubber cap faces the lightened portion, and the inner peripheral surface of the rubber cap faces and closely contacts the inner peripheral surface of the housing from a position displaced from the corner portion. Therefore, even if the corners are slightly displaced from each other, they are closely contacted so that no gap is generated between the adjacent surfaces.

Further, in the invention according to claim 2 configured as described above, the inner peripheral surface of the rubber cap facing the side surface of the housing is formed with a concave portion over the entire circumference, and from the concave portion to the inner peripheral side. The fold-shaped inner lip protrudes toward and sticks to the side surface of the housing at the tip. Therefore, even if water enters from the outside, it is dammed by the inner lip, and the dammed water collects in the recess. The accumulated water flows toward the corner through the recess like a gutter and flows outward from the corner through the thinned portion. Here, if the shape of the inner lip is made into a mountain shape or inclined depending on the installed state of the housing, it is possible to make water easily flow down to the lightening portion.

[0009]

According to the present invention, no gap is formed on the surface, but a gap is formed at the corner so as to communicate with the inside and outside. However, it is preferable from the viewpoint of overall waterproofness that the gap is formed in the corner portion with a shorter width than the gap is formed over a wide range in the surface portion. Therefore, according to the present invention, although a small gap is formed in advance only in the corner portion as compared with the conventional one in which a large gap is generated due to the displacement of the corner portion, it is possible to improve the waterproof property by reducing the gap as a whole. A possible rubber cap can be provided.

By the way, if the inner peripheral surface of the rubber cap is flat, in the event of water intrusion, the rubber cap will go deep into the rubber cap. However, according to the second aspect of the present invention, the inner lip and the recess in the middle of the flat portion can drain the water as described above. That is, by providing drainage, it is possible to maintain an optimum state in simple waterproofing.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a rubber boot for a connector to which a rubber cap according to an embodiment of the present invention is applied, and FIG. 2 is a sectional view showing an enlarged main part. In the figure, the connector housing 10 is formed in a rectangular box shape, and the four corners of the side surface are corners. Further, a plurality of terminal fitting housing chambers 11 penetrating in the vertical direction are formed, and the upper surface side serves as an insertion opening for the terminal fitting.

The rubber boot 20 is a connector housing 1.
0 from above, a main body portion 21 that covers the upper surface, a hood portion 22 that extends along the side surface of the connector housing 10 to cover the upper surface when covering the upper surface, and a connector portion housing that extends from the main body portion 21 and that extends from the main body portion 21. And a tubular portion 23 for pulling out the electric wire led out from 10.
The rubber boot 20 draws the electric wire led out from the connector housing 10 through the tubular portion 23 while
1 and the hood portion 22 are attached to cover and cover the upper surface and the side surface of the connector housing 10. In the present embodiment, the tubular portion 23 is formed to extend laterally from the main body portion 21 so as to face the opening, but at least the main body portion 21 and the hood portion 22 form a side surface from the upper surface of the connector housing 10. Anything can be used as long as it can be attached so as to cover it. Of course, not limited to the connector housing 10,
Anything that can cover a wide area such as a housing from the upper surface to the side surface may be used.

As shown in FIG. 2, lightening portions 22a are formed at the four corners of the inner peripheral surface of the hood portion 22. In this embodiment, the lightening portion 22a is formed as a circular hole, but it is sufficient if the two surfaces adjacent to the corners are divided by the lightening portion 22a, and a large slit-like shape is formed. Other shapes such as gaps may be used. On the inner peripheral surface of the hood portion 22, as shown in FIG.
A concave portion 22b is formed over the entire circumference so as to be orthogonal to the lightening portion 22a, and two annular fold-shaped inner lips 22b1 are formed in the concave portion 22b and have a length that protrudes from the concave portion 22b. Has been done. Hood part 22
The inner peripheral surface of the inner lip 22 has an opening shape that substantially matches the outer peripheral surface of the connector housing 10.
The opening b1 is slightly smaller than the outer peripheral shape of the connector housing 10. Therefore, the hood section 2
When the connector housing 10 is inserted into the inner housing 2, the inner lip 22b1 is expanded in diameter so as to come into close contact with the outer peripheral surface.

In each inner lip 22b1, the gap on the opening side of the rubber boot 20 in the recess 22b at the root of the inner lip 22b1 serves as a gutter, and the infiltrated water flows out from the lightening portion 22a through the gutter. . Also,
In the present embodiment, the recess 22b itself is formed so as to have a chevron shape between the lightening portions 22a, 22a at both ends, and the inner lip 22b1 also has a chevron shape.
It is low at a and 22a and high at the center. Therefore, the gutters are lowered at both ends, which facilitates the outflow of water when it enters. In addition, as in this embodiment,
If the concave portion 22b is formed on the root side of the inner lip 22b1, the tip comes into contact with the outer peripheral surface of the connector housing 10 in a state where a space is always held at the base of the fold, so that the soft fold characteristics are utilized. It becomes easier to adhere.

The inner peripheral surface of the hood portion 22 and the recess 2
An engaging recess 22 that can be engaged with the wedge-shaped projection 12 formed on the outer peripheral surface of the connector housing 10 at the inner side of 2b.
c is formed. In this embodiment, the engaging recess 22
Although c is formed inside the inner lip 22b1, it may be formed outside. Next, the operation of this embodiment having the above configuration will be described. The mounting is extremely easy, and the terminal fitting and the electric wire are attached to the connector housing 10, and the electric wire is pulled out through the hood portion 22, the main body portion 21, and the tubular portion 23, and is covered on the upper surface of the connector housing 10. When the connector housing 10 is inserted into the hood portion 22, the fold-shaped inner lip 22b1 protruding from the inner peripheral surface of the hood portion 22 is expanded in diameter, and the inner lip 22b1 has the tip at the tip thereof.
A watertight surface is formed in close contact with the outer peripheral surface of No. 0.

FIG. 4 shows a state in which the corners of the inner peripheral surface of the rubber boot 20 and the corners of the outer peripheral surface of the connector housing 10 coincide with each other. On the other hand, FIG. 5 shows a state in which both corners are slightly displaced. As shown in FIG. 5, the corner portion of the connector housing 10 has a lightening portion 22 a of the rubber boot 20.
It can be seen that no gap is formed on the side surface of the connector housing 10 as long as it is inside. On the other hand, water may enter from the outside, but basically it is dammed by the inner lip 22b1 and collects in the recess 22b at the root thereof. However, since the concave portion 22b and the inner lip 22b1 are chevron-shaped, as shown by the arrow in FIG.
2a, and then flows out of the rubber boot 20 through the lightening portion 22a. In this embodiment, the connector housing 10 is formed in a mountain shape on the assumption that the upper surface of the connector housing 10 is held horizontally, but if the installation state is oblique, the inclination direction may be changed accordingly.

As described above, in the rubber boot 20 to which the rubber cap is applied, the round hole-shaped lightening portion 22 is formed in the corner portion of the inner peripheral surface of the hood portion 22 that covers the side surface of the connector housing 10.
Since a is formed, the connector housing 1 having a corner portion
Even when the corners are displaced from each other when mounted on 0, the lightening portion can absorb the deviation.
The inner peripheral surface of the hood portion 22 adjacent to 2a is in close contact with the outer peripheral surface of the connector housing 10 without a gap.

[Brief description of drawings]

FIG. 1 is a perspective view of a rubber boot to which a rubber cap according to an embodiment of the present invention is applied.

FIG. 2 is a sectional view of a corner portion of a rubber boot.

FIG. 3 is a sectional view of a rubber boot.

FIG. 4 is a cross-sectional view of the corners of the rubber boot and the connector housing when the corners are aligned with each other.

FIG. 5 is a cross-sectional view of a corner portion of the rubber boot and the connector housing when the corner portion is displaced.

FIG. 6 is a perspective view of the inner peripheral surface of the rubber boot, showing the direction in which water flows out.

FIG. 7 is a perspective view of a rubber boot to which a conventional rubber cap is applied.

FIG. 8 is a cross-sectional view showing a state where the rubber boot is attached to a connector housing.

FIG. 9 is a cross-sectional view of the corners of the rubber boot and the connector housing when the corners are displaced.

[Explanation of symbols]

 10 ... Connector housing 20 ... Rubber boot 21 ... Main body part 22 ... Hood part 22a ... Lightening part 22b ... Recessed part 22b1 ... Inner lip 23 ... Cylindrical part

Claims (2)

[Claims] 1. A rubber cap having an opening that substantially corresponds to the outer shape of a housing having a corner portion and covering one surface of the housing from the opening, wherein the corner portion of the inner peripheral surface is lightened. Characteristic rubber cap. 2. The rubber cap according to claim 1, wherein a concave portion is formed on the inner peripheral surface over the entire circumference, and a fold-shaped inner lip is protruded from the concave portion toward the inner peripheral side, A rubber cap characterized by crossing the lightening portion and the same inner lip.