JPS5829576Y2 - 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.

Conventionally, as shown in Fig. 1, waterproof plugs of this kind have been constructed using an elastic member such as rubber to fit the fitting wall of connector a.
The main body C is provided with a wire insertion hole d and a tapered surface e is formed on the outer periphery.

In the above configuration, a waterproof seal is achieved through contact between the tapered surface e and the fitting wall, and the formation of the tapered surface e facilitates fitting of the waterproof plug to the connector, but in reality, the wire insertion hole d When the wire is passed through, the main body C bulges, making it difficult to fit, which has the disadvantage of S, and if it is incompletely fitted, a backward force will be applied to the tapered surface e, which may cause the main body C to come out. .

This invention was made in view of the above-mentioned circumstances, and the purpose is to provide a waterproof plug for a connector that is easy to fit and attach to a connector and has a high waterproof sealing effect.

This invention will be explained below based on the drawings. In Fig. 2, 1 is a cylindrical waterproof plug body made of an elastic member such as rubber or plastic, and a plurality of wire insertion holes 2 are provided inside. A plurality of annular protrusions 3 and 4 (two annular protrusions each in the figure) are provided on the inner periphery of the insertion hole 2 and the outer periphery of the main body 1, respectively.

The above structure is the same as the conventional one, but in this invention, an annular groove 5 is provided that opens on the wire extraction side of the waterproof plug body 1.

The annular groove 5 is formed along the outer periphery of the main body 1 so that the groove bottom 6 is close to the end surface 7 of the main body 1 on the connector fitting side.
The mantle part 8 which is partitioned by the main body 1 through the groove bottom 6
provided so as to be elastically displaced in the diametrical direction.

Next, the effect will be explained.

First, as shown in FIG. 3, the electric wire 10 with the electric connector 9 crimped is passed through the electric wire insertion hole 2 of the main body 1, and the electric wire 10 is pressed into the fitting wall 12 of the connector 11 and fitted.

At this time, the main body 1 expands and becomes larger in its diametrical direction due to the insertion of the electric wire 10, but since there is a space formed by the annular groove 5, the diameter of the outer mantle 8 can be easily reduced by pressing from the periphery with a fingertip or the like. Do a little.

Therefore, fitting into the connector can be easily performed.

In the fitted state, the mantle part 8 tries to elastically return to its original state via the groove bottom part 6, so that the mantle part 8 or the annular protrusion 4 on the outer periphery of the mantle part contacts the inner surface of the fitting wall 12 of the connector. press against.

That is, according to this invention, the formation of the annular groove 5 elastically absorbs the change in the outer diameter of the waterproof plug body due to the insertion of the electric wire, making fitting to the connector extremely easy and preventing incomplete fitting. Not only can this be prevented, but also a complete waterproof seal can be achieved because the outer mantle sectioned by the interposition of the annular groove elastically presses against the inner surface of the fitting wall of the connector.

Note that the annular protrusions 3 and 4 enhance the sealing effect through line contact.

As explained above, in this invention, an annular groove is recessed along the outer periphery of the waterproof plug body having a wire insertion hole on the wire extraction side, and the groove bottom of the annular groove is formed on the end surface of the connector fitting side of the body. Since they are arranged close to each other, it is possible to provide a waterproof plug for a connector that is easy to fit and attach to a connector and has a high waterproof sealing effect.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional example of a waterproof plug for connectors;
The figures show one embodiment of this invention, with A being a front view thereof, the mouth being a longitudinal sectional view thereof, and FIG. 1... Waterproof plug body, 2... Electric wire insertion hole, 5... Annular groove.

Claims (1)

[Scope of utility model registration request] A connector characterized in that an annular groove is recessed along the outer periphery of the waterproof plug body on the wire extraction side of the waterproof plug body having an electric wire insertion hole, and the bottom of the annular groove is brought close to the end surface of the body on the connector fitting side. waterproof plug.