JPS5829575Y2 - Waterproof plug for connector - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a waterproof plug for a connector.

Connectors generally make electrical connections by mating female and male connectors with internal electrical connectors, and are often used for electrical wiring in automobiles, etc., but they are particularly susceptible to rainwater infiltration, such as in engine compartments. At the location, a waterproof plug is fitted to the rear end of the connector, that is, the wire connection side, to protect the inside.

As shown in Fig. 1, the conventional waterproof plug has a connector a.
The main body C of the waterproof plug is shaped with an elastic member such as rubber to fit the fitting wall of Waterproof sealing is achieved by contact between surface e and the fitting wall.

According to the above configuration, the tapered surface e, which serves as the sealing surface, of the unused waterproof wall is always exposed to the outside.

Therefore, in the past, there was a drawback that the waterproof plug was damaged or had dust attached to it before it was assembled, reducing the waterproofing effect.

In addition, although the tapered surface e facilitates fitting into the connector, passing the wire through the wire insertion hole d causes the main body C to bulge, which often makes assembly difficult. There was a problem that the seal itself became incomplete.

This invention has been made in view of the above points, and aims to provide a waterproof plug for a connector that is free from damage to the sealing surface, is easy to assemble to a connector, and has a waterproof effect.

Hereinafter, this invention will be explained based on the drawings. In FIG. 2, reference numeral 1 denotes a cylindrical waterproof plug main body, and an electric wire insertion hole 2 is provided in the axial direction.

This is the same structure as the conventional one, but in this invention, the diameter R of the main body 1 is formed sufficiently smaller than the inner diameter of the fitting wall 7 (see FIG. 3) of the connector 6.

A skirt portion 3 that widens toward the end is provided on the connector fitting side of the main body 1.

Next, to explain the operation, as shown in FIG. 3, first, the electric wire 5 with the electric connector 4 crimped is passed through the wire insertion hole 2 of the main body 1, and the skirt portion 3 is folded back toward the main body 1 and its inner surface 3a to the outside.

If this is pressed into the fitting wall 7 of the connector 6 and fitted,
The inner surface 3a of the skirt portion 3 contacts the fitting wall 7, and the inside is sealed.

According to the above configuration, the inner surface 3a of the skirt portion 3 that comes into contact with the fitting wall 7 of the connector is not exposed to the outside when not in use, and the drawbacks of conventional methods such as scratches and adhesion of rubber are almost eliminated. .

In addition, by making the diameter R of the main body 1 smaller than the inner diameter of the fitting wall 7 of the connector even if the folded thickness of the skirt portion 3 is added, the swelling due to the insertion of the electric wire 5 can be absorbed, so that the fitting installation to the connector is made easier. can be done extremely easily.

Further, the folded skirt portion 3 comes into elastic contact with the fitting wall 7 due to the elastic restoring force of the material itself, so that a sufficient waterproof sealing effect can be achieved.

FIG. 4 shows another embodiment of this invention, in which annular protrusions 8 and 9 are provided on the inner surfaces of the skirt portion 3 and the wire insertion hole 2, respectively.

These protrusions 8°9 provide reliable line contact between the fitting wall 7 and the electric wire 5, respectively, which has the advantage of increasing the waterproofing effect.Therefore, it is preferable to use a plurality of protrusions 8 and 9 rather than one. .

FIG. 5 shows another implementation of this invention, in which the skirt portion 3
A 01J-shaped protrusion 10 is provided that protrudes from the inner and outer surfaces of the inner and outer surfaces.

In this case, as shown in FIG.
Since the reaction force acts on the inner surface 10b of the protrusion 10 that contacts the connector fitting wall I, the waterproof sealing effect is further improved.

As explained above, this device is used by providing a skirt part on the connector fitting side of the waterproof plug body, folding the skirt part back when mating occurs, and making the inner surface of the skirt part come into contact with the connector fitting wall. This eliminates the risk of scratches on the sealing surface of the waterproof plug that comes into contact with the mating wall of the connector, as was the case in the past.In addition, the waterproof plug is extremely easy to attach to the connector and has a waterproof sealing effect. can be provided.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional example of a waterproof plug for connectors;
The figure is a longitudinal cross-sectional view showing one embodiment of this invention, Fig. 3 is a longitudinal cross-sectional view showing its usage condition, Figs. FIG. 6 is a longitudinal sectional view showing the state of use of FIG. 5; 1... Waterproof plug body, 2... Electric wire insertion hole, 3... Skirt portion, 8, 9... Annular protrusion, 10... ...Protrusion of OIJ ridge.

Claims (3)

[Scope of utility model registration request] (1) A waterproof connector for a connector in which a skirt portion is provided on the connector fitting side of the waterproof plug body having a wire insertion hole, the skirt portion is folded back toward the main body side, and the inner surface of the skirt portion is inscribed with the fitting wall of the connector. plug. (2) The waterproof plug for a connector according to claim 1 of the utility model registration claim, wherein an annular protrusion is provided on the inner surface of the skirt portion. (3) The first prediction of the scope of the utility model registration claim is a waterproof plug for a self-mounted connector that has an OIJ song-like protrusion on the skirt.