Inter-connecting terminal

Abstract: An inter-connecting terminal (20) has a U-shaped barrel (21) into which a core wire (5) exposed at an intermediate portion of a first electric wire (W1) and a core wire (5′) exposed at an end of a second electric wire (W2) are inserted. Side walls (21b,21c) of the barrel are pressed against the core wires inserted into the barrel so as to fix and contact with the core wires. A V-shaped stopper (22) is formed integrally with the terminal and extends from the front end of the bottom (21a) of the barrel and is bent backward so as to receive the end portion of the core wire of the second electric wire. The drawing to be published with the abstract is Fig. 1.

Description: The present invention relates to an inter-connecting terminal and more particularly to the inter-connecting terminal comprising a core wire-pressing barrel accommodating a core wire exposed in an intermediary portion of an electric wire and a core wire exposed at an end of another electric wire. The barrel is pressed by a presser to deform the barrel so that the electric wires are fixed to the terminal under pressure. A conventional inter-connecting terminal to be used to connect core wires of electric wires of a wire harness for use in an automobile or an Office Action equipments has a construction as shown in Fig. 4. That is, a conductive metal plate is formed into an inter-connecting terminal, approximately U-shaped in its sectional configuration, consisting of a bottom 2 in a circular arc configuration and side walls 3A and 3B projecting upward from the bottom 2. As shown in Fig. 4, a core wire 5 exposed in an intermediate portion of an electric wire W1 and a core wire 5′ exposed at an end of an electric wire W2 are inserted into the space surrounded with the bottom 2 and the side walls 3A and 3B. Then, the side walls of terminal 1 are pressed to connect the electric wires W1 and W2 with each other and the side walls and fixed them to the terminal 1. As a method for fixing the core wires 5 and 5′ to the terminal 1 most widely adopted, the core wire 5 of the electric wire W1 and the core wire 5′ of the electric wire W2 vertically held are inserted into the space of the interconnecting terminal 1 placed on a fixed anvil 7 of a presser 6 as shown in Figs. 5 and 6. Then, a crimper 8 is moved downward to deform the side walls 3A and 3B. In this manner, the core wires 5 and 5′ are connected with each other and the side walls 3A and 3B and fixed to the terminal 1 as shown in Fig. 4. It is necessary to insulate the terminal 1 and a necessary portion of the electric wires W1 and W2 after the core wires 5 and 5′ are fixed to the terminal 1. As insulating methods, molding or welding is adopted to insulate the necessary portion. In addition, an insulating tube or an insulating case is used to cover the necessary portion. The method as shown in Fig. 7 is most widely adopted. That is, the necessary portion is covered with an adhering vinyl tape 9 which is inexpensive. However, the above-described conventional interconnecting terminal 1 has the following problem: It is difficult to position the core wires 5 and 5′ appropriately in the space of the terminal 1. That is, the core wire 5′ cannot be projected from the front end of the terminal 1 in a predetermined length ((G) shown in Fig. 6). In addition, in the process of compressing the core wires 5 and 5′ during the operation for pressing them and in the process of insulating, there is a possibility that the leading end portion of the core wire 5′ is curved at an angle of ϑ as shown in Fig. 8. If the electric wires W1 and W2 and terminal 1 are covered with the adhering vinyl tape 9 to insulate them with the leading end portion of the core wire 5′ curved, there is a possibility that the core wire 5′ breaks the adhering vinyl tape 9 as shown in Fig. 9. The core wire 5′ which has broken the adhering vinyl tape 9 may cause a circuit adjacent thereto to be shorted. It is an object of the present invention to provide an inter-connecting terminal which facilitates the positioning of a core wire exposed at an end of an electric wire inserted in the space thereof while the terminal is pressed by a presser. It is another object of the present invention to provide an inter-connecting terminal which allows an end portion of the core wire exposed at an end of an electric wire to be projected in a predetermined length from the front end of the terminal. It is still another object of the present invention to provide an inter-connecting terminal which prevents the curving of an end portion, of the core wire exposed at an end of an electric wire, projecting from the front end of the terminal so that the core wire is prevented from breaking an insulating tape and projecting therefrom. In accomplishing these and other objects of the present invention, there is provided an inter-connecting terminal comprising a barrel, U-shaped in the sectional configuration thereof, into which a core wire exposed at an intermediate portion of a first electric wire and a core wire exposed at an end of a second electric wire are inserted, wherein the core wire of the second electric wire is inserted into a V-shaped stopper, integral with the barrel, extending from the front end of the bottom of the barrel and bent backward. According to the above-described construction, since the stopper is formed at the front end of the barrel, the leading end of the core wire of the second electric wire can be easily inserted into the stopper at an appropriate position during pressing operation and further, the core wire of the second electric wire can be projected from the front end of the barrel in a predetermined length. In addition, the stopper protects the leading end portion of the core wire projecting from the front end of the barrel and prevents the core wire from being curved at the leading end thereof. Accordingly, an insulating tape which is to be wound around the first and second electric wires and the terminal can be prevented from being broken by the front portion of the core wire of the second electric wire and thus a circuit adjacent to the core wire can be prevented from being shorted. Preferably, the stopper extends backward into the space surrounded with the side walls of the barrel so that the core wire of the first electric wire is inserted into the space disposed above the stopper; and serrations are formed on the upper and lower surfaces of the stopper. According to this construction, the serrations shear the oxide films of the core wires of the first and second electric wires in contact with the upper and lower surfaces of the stopper, respectively from the core wires. Thus, the core wires are electrically connected with the terminal via the stopper. Preferably, the core wire of the second electric wire is projected from the front end of the barrel in the length of 0.1mm to 3mm. It is preferable that the stopper is interposed as far as the rear end of the barrel so that the core wires can contact the serrations in a larger area. The serrations formed on the upper and lower surfaces of the stopper spaced at certain intervals may be arranged vertically, horizontally or inclined or may consist of a plurality of circular or rectangular grooves so long as they shear the oxide films formed on the surface of each core. 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 perspective view showing an inter-connecting terminal according to a first embodiment of the present invention; Fig. 2 is a view showing a pressing process according to the first embodiment; Figs. 3A and 3B are perspective views showing an inter-connecting terminal according to a second embodiment and a third embodiment of the present invention, respectively; Fig. 4 is a perspective view showing a conventional inter-connecting terminal; Fig. 5 is a view showing a pressing process carried out by a presser; Fig. 6 is a view showing the pressing process carried out by the presser; Fig. 7 is a perspective view showing a state in which an insulating tape is wound around an inter-connecting terminal; Fig. 8 is a front view showing a problem of the conventional inter-connecting terminal; and Fig. 9 is a front view showing the problem of the conventional inter-connecting terminal. 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. The embodiment of the present invention will be described below with reference to the drawings. Figs. 1 and 2 show a first embodiment. A material such as a conductive metal plate is formed into an interconnecting terminal 20 comprising a stopper 22 and a core wire-pressing barrel 21 integral with the stopper and approximately U-shaped in its sectional configuration. Serrations 23 consisting of grooves are formed on the inner surface of a bottom 21a of the barrel 21 and that of side walls 21b and 21c thereof. The serrations 23 are spaced at certain intervals in the longitudinal direction of the barrel 21 as shown in Fig. 1. The stopper 22 consisting of a narrow plate projects by a predetermined length (G) forward from the front end of the bottom 21a to form a forward projection portion 22a and bent backward to form a backward bent portion 22b so that the stopper 22 is approximately V-shaped. Preferably, the projection length (G) of the stopper 22 is in the range from 0.1mm to 3mm. It is 2mm in this embodiment. The forward projection portion 22a is bent upward toward the rear of the barrel 21 to form a space (S) between the forward projection portion 22a and the backward bent portion 22b so as to insert the core wire 5′ exposed at an end of the electric wire W2 thereinto. The backward bent portion 22b is disposed between the side walls 21b and 21c so as to partition the space surrounded with the bottom 21a and the side walls 21b and 21c into an upper space and a lower space. In fixing the electric wires W1 and W2 to the terminal 20, the core wire 5′ of the electric wire W2 is inserted between the bottom 21a of the barrel 21 and the backward bent portion 22b of the stopper 22, namely, the lower space of the barrel 21 so as to bring the leading end of the core wire 5′ into contact with the front end of the forward projection portion 22a. The core wire 5′ of the electric wire W2 can be easily inserted into the lower space of the barrel 21 from the backward direction because the entire space between the forward projection portion 22a and the backward bent portion 22b is wide due to the upward inclination of the backward bent portion 22b. Then, the core wire 5 exposed in an intermediate portion of the electric wire W1 is inserted into the space above the backward bent portion 22b, namely, the upper space of the barrel 21. Thereafter, the core wires 5 and 5′ are fixed to the terminal 20 by a presser as shown in Figs. 5 and 6 similarly to the conventional method previously described. More specifically, the crimper 8 is moved downward to press the side walls 21b and 21c of the terminal 20 placed on the anvil 7. As a result, the side walls 21b and 21c are deformed under pressure, thus pressing the core wires 5 and 5′ downward and the backward bent portion 22b interposed between the side walls 21b and 21c. While the side walls 21b and 21c are being pressed against the core wires 5 and 5′, the core wires 5 and 5′ contact the serrations 23 of the barrel 21. As a result, the serrations 23 shear the oxide film formed on the surface of the core wires 5 and 5′. Thus, the core wires 5 and 5′ are favorably electrically connected with the terminal 20. Since the core wire 5′ projecting from the front end of the barrel 21 is surrounded with the stopper 22, the leading end of the core wire 5′ can be prevented from being curved during the pressing operation. Therefore, an insulating tape which is to be wound around the electric wires W1, W2 and the terminal 20 can be prevented from being broken by the front portion of the core wire 5′. A second embodiment of the present invention will be described below with reference to Fig. 3A. In the second embodiment, serrations 25 are formed on the upper and lower surfaces of the backward bent portion 22b interposed between the side walls 21b and 21c in addition to the serrations 23 formed on the inner surface of the bottom 21a and that of side walls 21b and 21c. Owing to the shearing effect of the serrations 25, the oxide film formed on the core wires 5 and 5′ can be more effectively sheared therefrom. Thus, the core wires 5 and 5′ can be electrically connected with each other via the stopper 22 with more effect. That is, the terminal 20 and the electric wires W1 and W2 can be more favorably connected with each other. A third embodiment is described below with reference to Fig. 3B. In the third embodiment, the backward bent portion 22b is not interposed between the side walls 21b and 21c so as to project the leading end of the core wire 5′ in a predetermined length from the front end of the barrel 21 and prevent the core wire 5′ from being curved at the leading end thereof. 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: An inter-connecting terminal (20) comprising a barrel (21) formed U-shape in the sectional configuration thereof, into which a core wire (5) exposed at an intermediate portion of a first electric wire (W1) and a core wire (5′) exposed at an end of a second electric wire (W2) are inserted, and side walls (21b,21c) of said barrel are pressed against said core wires inserted into said barrel so as to fix and contact with said core wires characterized in that a V-shaped stopper (22) is formed integral with said terminal and extended from the front end of the bottom (21a) of said barrel and bent backward so as to receive the end portion of the core wire of said second electric wire. An inter-connecting terminal as defined in claim 1, wherein said stopper extends backward into a space surrounded with the side walls of said barrel so that the core wire of said first electric wire is inserted into the space disposed above said stopper; and the core wire of said second electric wire is inserted into the space between said stopper and said bottom. An inter-connecting terminal as defined in claim 2, wherein serrations (25) are formed on the upper and lower surfaces of said stopper. An inter-connecting terminal as defined in any preceding claim, wherein serrations (23) are formed on the inner surfaces of the side walls and the bottom of said barrel. An inter-connecting terminal as defined in any preceding claim, wherein said terminal and the end portions of said first and second wires connected with said terminal are covered with an adhering vinyl tape.

Inventors: ITO AKIRA C O SUMITOMO WIRING, ITO, AKIRA, C/O SUMITOMO WIRING SYSTEMS LTD.
Applicants: SUMITOMO WIRING SYSTEMS, SUMITOMO WIRING SYSTEMS, LTD.
Application year: 1992
Main classification: H01R4
IPC codes: H01R4, H01R43, H01B13