BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cable connector and, more specifically, to a cable connector of structure which prevents inflow of molding resin when integrally molding a cable connected to a terminal with a bushing in order to enhance a tensile strength of a cable and to secure fluid-tight properties.
2. Prior Art
In the prior art, as disclosed in JP-UM-A-62-57390, a cable connector including a bushing passed through and mounted to a pass-through slot of an equipment member in a fluid-tight manner, and a waterproof connector connected to the pass-through bushing and having a terminal connected to a conductor of a cable is known. The fluid-tight properties (water-proof properties) of the cable connector configured in this manner can hardly be secured and maintained due to its age deterioration, for example. Therefore, as shown in FIGS. 9A to 10C, a cable connector 20 is coupled by integrally molding an outer insulating matrix 21 and an inner insulator 21a with a tip end portion of a cable 26 including a plurality of leads 22 exposed and diverged therefrom using a bushing 25 formed of synthetic resin.
In other words, as shown in FIGS. 9A and 9B, the cable connector 20 includes the outer insulating matrix 21 and the inner insulator 21a, and the inner insulator 21a is formed with a plurality of assembly holes 21b for terminals which are formed into a grid shape and pass through in the fore-and-aft (fitting) direction. Metallic connecting terminals 23 connected to the respective ends of the leads 22 by crimped portions 23b are fitted into the assembly holes 21b. The connecting terminals 23 connected to the leads 22 are press-fitted into the inner insulator 21a. Then, the inner insulator 21a is covered with the insulating matrix 21, and is accommodated in a metal mold. Subsequently, the outer insulating matrix 21, the leads 22, the tip end portion of the cable 26 including a plurality of leads 22 exposed and diverged therefrom and the bushing 25 which envelopes the outer insulating matrix 21, the leads 22, and the tip end portion of the cable 26, are integrally molded. Reference numeral 25a designates a mounting hole, and reference numeral 26a designates an outer sheath of the cable 26, respectively.
However, in the case of the cable connector 20 as described above, as shown in FIG. 9B, resin may flow from the terminal assembly holes 21b in the direction indicated by arrows 24 at the time of integral molding, and reach electrical contact portions, thereby hindering the electrical communication. Also, there is a case where components such as the connecting terminals 23 are pressed and hence deformed by being pressed by a molding pressure at the time of the integral molding (G in the figure), thereby hindering the fitting of the connector.
Therefore, as shown in FIGS. 11A to 11C, there is a case where a lid member (spacer) 27 that dogs the terminal assembly holes 21b is provided for preventing the resin from flowing into the terminal assembly holes 21b of the insulator. The lid member 27 is formed of an elastic rubber plate. The lid member 27 is assembled in a procedure shown in FIG. 11C. As shown in FIG. 12A, there is a case where a sealing material 28 is applied before molding to prevent intrusion of the resin.
However, according to a countermeasure for preventing the intrusion of the resin at the time of integral molding, for example, as shown in FIG. 11B, the shape of the connector product is upsized by an amount corresponding to an a portion in the longitudinal direction of the cable or by an amount corresponding to a 13 portion as shown in FIG. 12B. In addition, as shown in FIG. 13, water or air propagates in the leads 22 and hence enters the inside of the connector product as shown by arrows 24a, thereby resulting in a product inferior in air-tight properties or fluid-tight properties.
SUMMARY OF THE INVENTION
The cable connector according to the invention is proposed in order to solve the problems described above.
In order to solve the above-described problems and achieve the object, the invention provides a cable connector including a connector body formed of an insulating material and formed with a plurality of terminal through holes; connecting terminals fitted into the terminal through holes; a cable including a plurality of leads having end portions crimped to base portions of the connecting terminals respectively; and a synthetic resin bushing configured to couple the connector body, a tip end portion of the cable including the leads exposed and diverged therefrom integrally by molding; wherein stoppers are disposed between end portions of the leads and the connecting terminals and inside the connector body and prevent intrusion of synthetic resin as the bushing material so as not to flow from ends of the leads toward ends of the connecting terminals when coupling by molding.
The connector body preferably includes an outer insulating tube provided outside and an inner insulator for a terminal, contained in an inner peripheral wall surface of the outer insulating tube in sliding contact therewith, and having a plurality of terminal through holes, and the inner insulator for the terminal is formed with a communicating portion communicating with the terminal through holes in a mid section in the connecting direction, the stoppers are inserted and fitted into the communicating portion, and the stoppers are fixed so as not to be disconnected by the outer insulating tube covered on the inner insulator for the terminal.
Further, preferably, the stopper is an insulator integrally formed of synthetic resin having projecting pieces to be fitted into the respective terminal through holes and a coupling piece configured to integrally couple these projecting pieces.
According to the cable connector of the invention, with the presence of the stoppers between the connecting terminals and end portions of the leads, the stoppers are built in the product and the general size of the connector as the product may be reduced. With the provision of the stopper, the inflow of the synthetic resin toward the end side of the connecting terminal at the time of integral molding is eliminated, the conditions of the integral molding are made stable, and the productivity is achieved.
With the fixation of the connecting terminal and part (mold lance) of the inner insulator for the terminal directly with the stopper, a molding pressure applied at the time of the integral molding is reduced, and “deformation” and “slippage” of the terminal can be prevented. In addition, a fixing forte of the terminal is improved, which contributes to prevention of disconnection of the terminal.
In addition, the leads can be covered to their ends with the integral molding resin or a sealing material, to advantageously improve the airtight properties and fluid-tight properties and to advantageously block the intrusion of water or air.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a vertical cross-sectional view showing a cable connector according to the invention;
FIG. 2 is a lateral cross-sectional view showing the cable connector;
FIGS. 3A to 3F are a front view, left and right side views, a plan view, a bottom view, and a back view respectively showing an outer insulating tube in the cable connector;
FIGS. 4A to 4F are a front view, left and right side views, a plan view, a bottom view, and a back view respectively showing an inner insulator for a terminal in the cable connector;
FIGS. 5A to 5F are a front view, a bottom view, a back view, a plan view, and left and right side views respectively showing connecting terminals in the cable connector;
FIG. 6 is an exploded cross-sectional view showing an assembly procedure of the cable connector;
FIG. 7 is an exploded perspective view showing an assembly procedure of the cable connector;
FIG. 8 is an enlarged lateral cross-sectional view showing a state before integral molding of the cable connector;
FIGS. 9A and 9B are a vertical cross-sectional view and a lateral cross-sectional view respectively showing a connector according to the prior art;
FIGS. 10A to 10C are a front view, a side view, and a bottom view of the connector, respectively;
FIGS. 11A to 11C are a vertical cross-sectional view, a lateral cross-sectional view, and an exploded perspective view respectively showing an assembly procedure of the connector, illustrating an example in which a lid member for preventing the inflow of the synthetic resin is provided;
FIGS. 12A and 12B are a vertical cross-sectional view and a lateral cross-sectional view illustrating an example of the connector in which a sealing material that prevents the inflow of the synthetic resin is provided; and
FIG. 13 is a lateral cross-sectional view showing an example in which the sealing material that prevents the inflow of the synthetic resin in the connector is provided.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
As shown in FIG. 1, a cable connector 1 according to the invention includes a connector body 6 formed of an insulating material having a plurality of terminal through holes 4a formed therethrough, connecting terminals 5 fitted into the terminal through holes 4a, cable 26 including a plurality of leads having end portions that are crimped to base portions (clamping portions) 5b of the connecting terminals 5, a bushing 25 formed of synthetic resin for coupling the connector body 6 and a tip end portion of the cable 26 including leads 22 exposed and diverged therefrom integrally by molding, and stoppers 2 configured to prevent the synthetic resin from flowing into the connector body 6 for preventing the synthetic resin as the bushing material from flowing from ends of the leads into end sides of the connecting terminals when coupling by molding.
The connector body 6 includes an outer insulating tube 3 shown in FIGS. 3A to 3F, and an inner insulator 4 for a terminal being contained in an inner peripheral wall surface of the outer insulating tube 3 shown in FIGS. 4A to 4F in sliding contact therewith and having the plurality of terminal through holes 4a formed therein. The inner insulator 4 for the terminal is formed with communicating portions 4b communicating with the terminal through holes 4a at a mid section in the connecting (fore-and-aft) direction.
As shown in FIGS. 5A to 5F, each of the connecting terminals 5 is formed at the end side thereof with electrical connecting portions 5a which are electrically connected to a contact of a connecting partner, and at the rear end side with an intermediary of coupling portion 5c with a base portion (clamping portion) 5b where the end portion of the lead 22 is clamped and secured.
The stoppers 2 are inserted from the communicating portions 4b of the inner insulator 4 for the terminal to be disposed between the end portions of the leads 22 and the electrical connecting portions 5a of the connecting terminals 5 and also inside the outer insulating tube 3, and prevents the intrusion of the synthetic resin, which is the material of the bushing 25, from flowing from the ends of the leads 22 toward the end sides of the connecting terminals 5 when coupling by molding.
The stopper 2, as shown in FIGS. 1, 6, and 7, is an insulator integrally formed of synthetic resin having a connecting piece 2b connecting projecting pieces 2a disposed corresponding to the respective connecting terminals 5 so as to prevent the inflow of the synthetic resin in a molten state when coupling the connector body 6 and tip end of cable 26 including exposed and diverged leads 22 integrally by molding. In this manner, by forming the stoppers 2 integrally, the lateral slippage of the projecting pieces 2a fitted into the respective communicating portions 4b is prevented.
The stoppers 2 are inserted and fitted into the communicating portions 4b of the inner insulator 4 for the terminal before coupling the connector body 6 and tip end of cable 26 including exposed and diverged leads 22 integrally by molding with the synthetic resin as the material of the bushing 25, so that a state shown in FIG. 8 is assumed. In other words, the stoppers 2 are arranged between the electrical connecting portions 5a of the connecting terminals 5 and mold lance portions 4c of the inner insulator 4 for the terminal. As a result of fitting of the stoppers 2 into the communicating portions 4b, the projecting pieces 2a enter between the electrical connecting portions 5a and 5a of the connecting terminals 5 as shown in FIGS. 5A and 5D.
In order to assemble the cable connector 1 as described above, the leads 22 having the connecting terminals 5 secured to the respective ends thereof are firstly fitted into the inner insulator 4 for the terminal as shown in FIG. 6 and FIG. 7. Subsequently, the connecting terminals 5 are fitted into the terminal through holes 4a from the rear toward the front respectively, and are press-fitted and secured thereto (see an arrow (1) in FIG. 6).
Then, the stoppers 2 are fitted into the communicating portions 4b of the inner insulator 4 for the terminal in the upward and downward directions (see an arrow (2) in FIG. 6). Subsequently, the outer insulating tube 3 is covered on the inner insulator 4 for the terminal (see an arrow (3) in FIG. 6 and FIG. 7). As the result, the stoppers 2 are fixed so as to be prevented from coming apart in the upward and downward directions.
FIGS. 6 and 7 show the cable connector 1 before being coupled integrally by molding. The cable connector 1 according to the invention as shown in FIGS. 1 and 2 is formed by setting the state of the assembly shown in FIG. 8 as described above into a metal mold and coupling the same integrally by molding. As shown in FIG. 2, even when the synthetic resin in the molten state intrudes through a gap between a rear inner edge portion of the inner insulator 4 for the terminal of the connector body 6 and outer peripheral surfaces of the leads 22, an intruded synthetic resin 25b is prevented from flowing forward of the connecting terminals 5 by the stoppers 2.
Water or air is also prevented from intruding from the front of the through holes 4a and propagating in the cables 22 by the stoppers 2 secured to the connecting terminals 5 in an air-tight manner. Furthermore, by being pressed by the stoppers 2 directly, the connecting terminals 5 are prevented from lifting and hence deformation or slippage due to the pressure of molding is prevented. Accordingly, the connecting terminals 5 are fixed firmly to the inner insulator 4 for the terminal and the resistance with respect to a pulling operation of the cable is increased.
The cable connector according to the invention is widely applicable not only as a cable connector, but also as a normal electrical connector.
Patent Grant
8052488
