Joint connector and plug fixation plate

Abstract: A joint connector comprising a plurality of terminals a housing and a bus bar plate. Each terminal accommodated in one of terminal-accommodating chambers of the housing has a slit groove making a right angle with a direction in which the terminal is inserted into the terminal-accommodating chamber. The housing has a slit opening formed at a position corresponding to the position of the slit groove. The bus bar plate is inserted into the housing via the slit opening. The lower end of the bus bar plate is pressed against the slit groove while the upper end of the bus bar plate is positioned inside the slit opening. In this manner, the bus bar plate is fixed to the housing.

Description: BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a combination of a joint connector and a number of terminals to be used to alter the wiring of electrical parts of an automobile or the like, and more particularly to a combination in which the joint connector comprises a small number of component parts and thus has a simple construction. Description of the Related Art An example of a conventional joint connector is described below with reference to Fig. 9. In the joint connector, a housing 1 has a plurality of chambers 1a for accommodating a terminal 2. In this example, the housing 1 has five chambers 1a and each chamber accommodates a terminal 2. A cover 4 incorporating a plurality of bus bars 3 is engaged by the housing 1 so as to connect each of a plurality of the terminals 2 with each of the bus bars 3. However, the conventional joint connector comprises many component parts such as the housing 1, the terminals 2, the bus bars 3, the cover 4, and the like. It is to be noted that in this type of joint connector, it is often necessary to double-lock each terminal 2. Consequently, the construction of a retainer 1b of the housing 1 and that of each bus bar 3 are complicated and thus it is costly to manufacture the joint connector. US-A-4 952 155 discloses a joint connector of a similar type which has the features indicated in the pre-characterizing part of claim 1. SUMMARY OF THE INVENTION It is an object of the present invention to provide a joint connector comprising a small number of component parts so as to allow the joint connector to have a simple construction and to be manufactured at low costs. According to the invention, this object is achieved by the features indicated in claim 1. Useful details of the invention are specified in the dependent claims. In accordance with the invention, a bus bar plate is insertable into a slit groove of the terminal accommodated in a terminal-accommodating chamber of the housing of the connector. Therefore, it is unnecessary to provide the joint connector with the cover to protect the bus bar, unlike the conventional joint connector. Thus, the joint connector can be composed of a small number of component parts. Further, the bus bar plate is inserted into the slit groove of the terminal so as to lock the bus bar plate to the housing. Therefore, the terminal can be double-locked to the housing without providing the joint connector with a retainer unlike the conventional joint connector. Thus, the joint connector has a simple construction. Furthermore, since the bus bar is plate-shaped, the construction of the housing can be simplified and thus the joint connector can be assembled easily and in addition, the cost for manufacturing the joint connector is much lower than that for manufacturing the conventional joint connector. 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 perspective view showing a joint connector according to a first embodiment of the present invention; Fig. 2 is a partially sectional plan view showing the joint connector of Fig. 1; Fig. 3 is a front view showing the joint connector of Fig. 1; Fig. 4 is a sectional view, showing the joint connector of Fig. 1, taken along a line A-A of Fig. 3; Fig. 5 is a sectional view showing a joint connector according to a second embodiment of the present invention; Fig. 6 is a perspective view showing a joint connector according to a third embodiment of the present invention; Fig. 7 is a front view showing a joint connector according to a fourth embodiment of the present invention; Fig. 8 is a perspective view showing the joint connector of Fig. 7; and Fig. 9 is a perspective view showing a conventional joint connector. 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. Referring to Figs. 1 through 4, a joint connector 6A according to a first embodiment of the present invention is described below. As shown in Figs. 1 and 2, a plurality (four in the first embodiment) of chamber 7a for accommodating terminal 8 is formed in a housing 7 made of synthetic resin at regular intervals in the width direction of the housing 7. As shown in Fig. 4, the housing 7 has a catch 7c formed in the bottom of each chamber 7a so that the catch 7c locks a locking portion 8a of a terminal 8 inserted into the chamber 7a from a rear opening 7b positioned in the rear thereof. A wiring cord 10 is fixed to the rear portion of each terminal 8 under pressure. A slit groove 8b is formed on an upper front portion of the terminal 8. The slit groove 8b is perpendicular to the direction in which the terminal 8 is inserted into the chamber 7a of the housing 7. The upper front portion of the housing 7 is projected to form a plurality of convex portions 7d spaced at regular intervals 7f in the width direction of the housing 7. A slit opening 7e is formed in the upper front portion of the housing 7 so that the slit opening 7e coincides with the slit groove 8b of the terminal 8 inserted into each chamber 7a. The slit opening 7e extends through the convex portion 7d and the interval 7f. Therefore, the chamber 7a communicates with the outside via the slit opening 7e. A bus bar plate 9 according to the first embodiment is rectangular. The bus bar plate 9 is so thick that it can be inserted through the slit opening 7e of the housing 7 as well as the slit groove 8b of the terminal 8 and pressed against the slit groove 8b. The length of the bus bar plate 9 in the vertical direction thereof is set as follows: That is, the upper end 9b of the bus bar plate 9 is positioned within the slit opening 7e formed through an upper wall 7g of the housing 7, when the bus bar plate 9 has been inserted into the slit opening 7e of the housing 7 and the lower end 9a of the bus bar plate 9 is in contact with the lower end of the slit groove 8b of the terminal 8. The method of assembling the joint connector 6A from the housing 7, the terminal 8, the bus bar plate 9, and other component parts is described below. First, the terminal 8 is inserted into the chamber 7a from the rear opening 7b thereof. The locking portion 8a of each terminal 8 is locked by the catch 7c. Then, when the upper end 9b of the bus bar plate 9 becomes flush with the upper surface of the upper wall 7g in inserting the bus bar plate 9 downward into the slit opening 7e of the housing 7 as shown in Fig. 1, a jig (not shown) is used to press the bus bar plate 9 downward into the slit groove 8b of the terminal 8 until the lower end 9a of the bus bar plate 9 reaches a predetermined position, namely, the bottom of the slit groove 8b. The space 7f is utilized to press the bus bar plate 9 downward. That is, the portion of the bus bar plate 9 corresponding to the space 7f is pressed by the jig. In the joint connector 6A according to the first embodiment, the bus bar plate 9 is accommodated in the slit opening 7e of the housing 7. Therefore, it is unnecessary to provide the joint connector 6A with the cover 4 (Fig. 9) unlike the conventional joint connector described previously. When the lower end 9a of the bus bar plate 9 is in contact with the bottom of the slit groove 8b, the upper end 9b of the bus bar plate 9 is positioned within the slit opening 7e of the housing 7, i.e., the bus bar plate 9 is locked by the slit opening 7e. Therefore, the bus bar plate 9 serves as a means for preventing the terminal 8 from being removed from the chamber 7a. That is, in the joint connector 6A according to the first embodiment, the terminal 8 is double-locked, i.e., the terminal 8 is locked by the catch 7c and the bus bar plate 9. Accordingly, it is unnecessary to provide the joint connector 6A with the retainer 1b (Fig. 9) unlike the conventional joint connector. In the first embodiment, one bus bar plate 9 is connected with four terminals 8, but the bus bar plate 9 may be connected with the terminals 8 in a different manner. For example, the bus bar plate 9 may be divided into two sections longitudinally so that each of the two sections of the bus bar plate 9 is connected with two terminals 8. A joint connector 6B according to the second embodiment is described below with reference to Fig. 5. In the joint connector 6B, an open portion formed in the upper front portion of the housing 7 is opened and closed by a cover 7k. The cover 7k has a flexible hinge portion 7h formed at the rear end thereof; and an opening 7j formed at the front end thereof so that a locking claw 7i of the housing 7 is tightly inserted into the locking opening 7j when the cover 7k has been closed. The cover 7k further comprises a slit opening 7e formed at a position corresponding to the slit groove 8b of the terminal 8. The method of assembling the joint connector 6B from the housing 7, the terminal 8, the bus bar plate 9, the cover 7k, and other component parts is described below. First of all, the bus bar plate 9 is inserted into the slit groove 8b of the terminal 8 from the lower end 9a thereof with the cover 7k opened, and then, the cover 7k is closed so that the locking claw 7i of the housing 7 is tightly inserted into the opening 7j of the cover 7k. As a result, the upper end 9b of the bus bar plate 9 and the vicinity thereof are inserted into the slit opening 7e of the cover 7k. It is possible to insert the bus bar plate 9 downward into the slit opening 7e after the cover 7k is closed. Similarly to the first embodiment, the bus bar plate 9 is inserted into the slit groove 8b of the terminal 8 via the slit opening 7e of the housing 7. Therefore, it is unnecessary to provide the joint connector 6B with the cover 4 to protect the bus bar plate 9 as shown in Fig.9. In addition, since the bus bar plate 9 serves as a means for preventing the terminal 8 from being removed from the chamber 7a, it is unnecessary to provide the joint connector 6B with the retainer 1b as shown in Fig.9 to double-lock the terminal 8 unlike the conventional joint connector. The other constructions and operations of the joint connector 7B according to the second embodiment are similar to those of the joint connector 6A according to first embodiment. Therefore, the descriptions thereof are omitted herein. A joint connector 6C according to the third embodiment is described below with reference to Fig. 6. In the joint connector 6C, a flexible hinge portion 7h is continuous with an open portion disposed in the front of the housing 7 as well as the rear of the cover 7k. The open portion of the housing 7 is opened and closed by the cover 7k. The cover 7k has the opening 7j into which the locking claw 7i of the housing 7 is inserted, when the open portion of the housing 7 has been closed by the cover 7k. A cantilever-shaped stop arm 7m is formed on an inner surface of the cover 7k. The upper portion of the stop arm 7m tapers off to a point. The bus bar plate 9 according to the third embodiment is sectionally L-shaped. The method of assembling the joint connector 6C from the housing 7, the terminal 8, the bus bar plate 9, the cover 7k, and other component parts is described below. First of all, the bus bar plate 9 is inserted into the slit groove 8b of the terminal 8 from the lower end 9a thereof with the cover 7k opened, and then, the cover 7k is closed to tightly insert the locking claw 7i of the housing into the opening 7j of the cover 7k. At this time, the upper end 9b of the L-shaped bus bar plate 9 is sandwiched between the inner surface of the cover 7k and the stop arm 7m. In this manner, the bus bar plate 9 is locked by the cover 7k. A joint connector 6D according to the fourth embodiment is described below with reference to Figs. 7 and 8. In the joint connector 6D, an open portion disposed in the front of the housing 7 is opened and closed by the cover 7k, similarly to the second and third embodiments. The hinge portion 7h disposed at one side wall of the cover 7k is integral with the housing 7. The locking claw 7i of the housing 7 is tightly inserted into the opening 7j of the cover 7k. In the joint connector 6D according to the fourth embodiment, a pair of locking projections 7m is formed on the inner surface of both side walls of the cover 7k. The upper end 9b of the bus bar plate 9 is inserted between the pair of the locking projections 7m so that the bus bar plate 9 is locked thereby. A rib 7p for detecting the catch 7c is formed on the entire inner surface of the cover 7k in the width direction of the cover 7k. The method of assembling the joint connector 6C from the housing 7, the terminal 8, the bus bar plate 9, the cover 7k, and other component parts is described below. First of all, the upper end 9b of the bus bar plate 9 is locked by the locking projection 7m of the cover 7k with the cover 7k opened, and then, the cover 7k is closed. As a result, the lower end 9a of the bus bar plate 9 is inserted into the slit groove 8b of the terminal 8 and the locking claw 7i of the housing 7 is tightly inserted into the opening 7j of the cover 7k. If the catch 7c has not engaged the terminal 8 in closing the cover 7k, the leading end of the catch 7c is positioned outside the housing 7. Consequently, the rib 7p is brought into contact with the upper surface of the catch 7c even though an operation for closing the cover 7k is made to close the cover 7k. As a result, the locking claw 7i of the housing 7 cannot be inserted into the opening 7j of the cover 7k. That is, according to the fourth embodiment, owing to the provision of the rib 7p, the terminal 8 which has not been correctly accommodated in the terminal-accommodating chamber 7a can be detected. 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.

Claims: A combination of a connector and a number of terminals (8), comprising: a housing (7) having a plurality of chambers (7a), each chamber being arranged for accommodating one terminal (8) and being provided with a catch (7c) for locking the terminal , the terminals (8) each having a slit groove (8b) making a right angle with the inserting direction into the chamber, and a locking portion (8a) for being locked by said catch, and a bus bar plate (9) insertable into said housing (7) for engaging each terminal, characterized in that said housing (7) has one slit opening (7e) communicating with the chambers (7a) at a right angle to the inserting direction of the terminal into the chamber, said bus bar plate (9) being insertable into said slit opening (7e) of the housing for being pressed into the slit groove (8b) of each terminal accommodated in the chamber so as to be locked in the housing. A combination of a joint connector and a number of terminals according to claim 1, wherein said bus bar plate (9) is rectangular and insertable into said slit opening (7e) and said slit groove (8b) in a vertical direction, a lower end of the bus bar plate is in contact with a lower end of the slit groove, and an upper end of the bus bar plate is positioned in the slit opening (7e). A combination of a joint connector and a number of terminals according to claim 1, wherein said bus bar plate (9) is sectionally L-shaped, said housing (7) has a cover (7k) for closing the slit opening, said cover is provided with a stop arm (7m), an upper end of the L-shaped bus bar plate is sandwiched between an inner surface of the cover and the stop arm, and a lower end of the L-shaped bus bar plate is inserted in the slit groove of the terminal and in contact with the lower end of the slit groove.

Inventors: INOUE NORI, SAKATANI ATHUSHI, INOUE, NORI, SAKATANI, ATSUSHI, Inoue, Nori, c/o Sumitomo Wiring Systems Ltd., SAKATANI, ATHUSHI C/O SUMITOMO WIRING SYSTEMS LTD.
Applicants: SUMITOMO WIRING SYSTEMS, SUMITOMO WIRING SYSTEMS, LTD.
Application year: 1993
Main classification: H01R9
IPC codes: H01R31, H01R13