Connector

Abstract: An engaging hole (5a) is formed in the housing (5) of a female connector. A waterproof rubber ring (6) is provided on the inner surface of the engaging hole (5a) so that the waterproof rubber ring (6) seals the space between the inner surface of the engaging hole (5a) and the outer surface of a male connector inserted into the housing (5) of the female connector. A plurality of stopper convex portions (6a) is formed on the outer surface of the waterproof rubber ring (6). A plurality of stopper concave portions (5d) which is to be engaged by each of the stopper convex portions (6a) is formed on the inner surface of the housing (5) of the female connector.

Description: BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a connector and more particularly, the connector comprising a waterproof rubber ring provided on the inner surface of an engaging hole formed in a housing of a female connector so as to seal the space between the inner surface of the engaging hole and he outer surface of a housing of a male connector inserted into the housing of the female connector, in which a plurality of stopper convex portions is formed on the outer surface of the waterproof rubber ring. Description of the Related Arts An example of a conventional connector of this kind is described below with reference to Figs. 6 and 7. A waterproof rubber ring 2 is installed in an engaging hole la, formed on a housing 1 of the female connector, for inserting the male connector (not shown) thereinto. The waterproof rubber ring 2 is provided to seal the space between the inner peripheral surface of the engaging hole la and the peripheral surface of the male connector. A pair of stopper projections 2a and 2a is formed on the peripheral surface of the rubber ring 2. A pair of stopper openings 1b and 1b is formed on the peripheral surface of the connector housing 1. Each of the stopper projections 2a and 2a engages each of the stopper openings 1b and 1b. In this manner, the rubber ring 2 is fixed to the connector housing 1. The stopper openings 1b and 1b penetrate through the wall of the connector housing 1. There is a short insulation distance between a terminal (not shown) inserted into a terminal accommodating hole 1c (not shown) as well as a connector (not shown) of the male connector and the peripheral surface of the connector housing 1. Consequently, if a high voltage is applied from the terminals to a metal component adjacent to the peripheral surface of the connector housing 1, electric current flows from the terminals to the metal component via the stopper openings 1b and 1b. As a result, a breakdown occurs in the connector housing 1. SUMMARY OF THE INVENTION It is an object of the present invention to provide a connector in which the occurrence of a breakdown can be effectively prevented. In accomplishing these and other objects, there is provided a connector comprising a waterproof rubber ring provided on the inner surface of an engaging hole formed in a housing of a female connector so as to seal the space between the inner surface of the engaging hole and the outer surface of a housing of a male connector inserted into the housing of the female connector. A plurality of stopper convex portions is formed on the outer surface of the waterproof rubber ring. A plurality of stopper concave portions which is engaged by each of the stopper convex portions is formed on the inner surface of the housing of the female connector. According to the above-described construction, a plurality of stopper concave portions formed on the inner surface of the housing of the female connector is engaged by each of the stopper convex portions formed on the outer surface of the waterproof rubber ring. A part of the peripheral wall between the bottom surface of each stopper concave portion and the outer surface of the housing of the female connector maintains insulating performance effectively. Accordingly, there is a comparatively long insulating distance between terminals accommodated in the accommodating chamber of the housing of the female connector and a metal component adjacent to the outer surface of the housing of the female connector. Thus, even though a high voltage is applied from the terminals to the metal component, leakage is unlikely to occur. Thus, no breakdown occurs in the housing of the female connector. Moreover, owing to the part of the peripheral wall between the bottom surface of each stopper concave portion and the outer surface of the housing of the female connector, the stopper convex portions of the rubber ring are not exposed to dust or rain. Accordingly, the housing of the female connector has a preferable insulating performance and thus the rubber ring is durable. BRIEF DESCRIPTION OF THE DRAWINGS These and other objects and features of the present invention will become clear from the following description taken in conjunction with the preferred embodiments thereof with reference to the accompanying drawings, in which: Fig. 1 is a sectional side elevation showing a connector housing according to the present invention; Fig. 2 is a front view of the connector housing shown in Fig. 1; Fig. 3 is a sectional view of the connector housing taken along a line A-A of Fig. 1; Fig. 4 is a front view showing a rubber ring; Fig. 5 is a side elevational view of the rubber ring shown in Fig. 4; Fig. 6 is a perspective view showing a conventional connector housing; and Fig. 7 is a sectional side elevation showing the conventional connector housing of Fig. 6. DETAILED DESCRIPTION OF THE INVENTION Before the description of the present invention proceeds, it is to be noted that like parts are designated by like reference numerals throughout the accompanying drawings. A connector according to an embodiment of the present invention is described below with reference to the drawings. Referring to Figs. 1 and 2, an engaging hole 5a and an accommodating chamber 5b are formed in a cylindrical connector housing 5 of a female connector comprising an insulating material made of synthetic resin or the like. A male connector (not shown) is inserted into the connector housing 5 through the engaging hole 5a. A terminal is accommodated in the accommodating chamber 5b. A pair of stopper concave portions 5d and 5d is formed on the inner peripheral surface of the engaging hole 5a of the connector housing 5 as shown in Figs. 2 and 3. The line connecting the stopper concave portions 5d and 5d with each other divides the circumference of the engaging hole 5a equally as shown in Figs. 2 and 3. The stopper concave portions 5d and 5d do not penetrate through the peripheral wall 5c of the connector housing 5, but are formed in a certain distance from the inner surface of the connector housing 5 toward the outer surface thereof. Referring to Figs. 4 and 5, the outer surface of a waterproof rubber ring 6 engages the inner peripheral surface of the connector housing 5, and the inner surface thereof engages the outer surface of the connector housing of the male connector inserted into the female connector. A pair of stopper convex portions 6a and 6a and contact projections 6b and 6b are formed on the outer surface of the rubber ring 6. Each of the stopper convex portions 6a and 6a inserted into the connector housing 5 engages each of the stopper concave portions 5d and 5d radially. In assembling the connector having the above-described construction, the rubber ring 6 is inserted into the engaging hole 5a of the connector housing 5, and each of the stopper convex portions 6a and 6a of the rubber ring 6 is inserted into each of the stopper concave portions 5d and 5d so that the former is engaged by the latter. In this manner, the rubber ring 6 is fixed to the connector housing 5 at a predetermined position thereof. Then, the male connector is inserted into the engaging hole 5a of the connector housing 5 so as to connect the terminals of both connectors with each other. At this time, the outer surface of the male connector closely contacts the inner surface of the rubber ring 6 in engagement therewith, and the outer surface of the rubber ring 6 closely contacts the inner surface of the engaging hole 5a of the connector housing 5 in engagement therewith, thus watertightly sealing the space between the male connector and the rubber ring 6 and the space between the rubber ring 6 and the connector housing 5. In the embodiment, as described previously, since the stopper concave portions 5d and 5d do not penetrate through the peripheral wall 5c of the connector housing 5, a part 5e of the peripheral wall 5c between the bottom surface of each of the stopper concave portions 5d and 5d and the outer surface of the connector housing 5 maintains insulating performance effectively. Accordingly, there is a comparatively long insulating distance between the terminals accommodated in the accommodating chamber 5b of the connector housing 5 and projecting from the engaging hole 5a and a metal component adjacent to the outer surface of the connector housing 5. Even though a high voltage is applied from the terminals to the metal component, leakage is unlikely to occur. Thus, no breakdown occurs in the connector housing 5 and thus the connector housing 5 is durable. Since the stopper convex portions 6a and 6a of the rubber ring 6 is covered with the peripheral wall 5c of the connector housing 5, the stopper convex portions 6a and 6a are not exposed to dust or rain. In this respect, the connector housing 5 has a preferable insulating performance and thus the rubber ring 6 is durable. In addition, when the male connector is removed from the engaging hole 5a of the connector housing 5 by pulling the male connector from the connector housing 5, rain does not stay in the engaging hole 5a, whereas in the conventional connector housing described previously, rain stays in the stopper hole 1b, thus penetrating into the engaging hole 1a. Although the present invention has been fully described in connection with the preferred embodiments thereof with reference to the accompanying drawings, it is to be noted that various changes and modifications are apparent to those skilled in the art. Such changes and modifications are to be understood as included within the scope of the present invention as defined by the appended claims unless they depart therefrom.

Claims: A connector comprising a waterproof rubber ring (6) provided on the inner surface of an engaging hole (5a) formed in a housing (5) of a female connector so as to seal the space between the inner surface of the engaging hole (5a) and the outer surface of a housing of a male connector inserted into the housing (5) of the female connector, in which a plurality of stopper convex portions (6a) is formed on the outer surface of the waterproof rubber ring (6); and a plurality of stopper concave portions (5d) which is engaged by each of the stopper convex portions (6a) is formed on the inner surface of the housing (5) of the female connector. The connector as defined in claim 1, wherein the plurality of stopper concave portions (5d) formed on the inner surface of the housing (5) of the female connector is engaged by each of the stopper convex portions (6a) formed on the outer surface of the waterproof rubber ring (6) and a part of the peripheral wall (5c) between the bottom surface of each stopper concave portion (5d) and the outer surface of the housing (5) of the female connector maintains insulating performance effectively.

Inventors: SAWADA HISASHI C O SUMITOMO WI, SAWADA, HISASHI, C/O SUMITOMO WIRING SYSTEMS, LTD.
Applicants: SUMITOMO WIRING SYSTEMS, SUMITOMO WIRING SYSTEMS, LTD.
Application year: 1993
Main classification: H01R13
IPC codes: H01R13