Joint connector, terminal fitting and connector housing

Abstract: The purpose of the present invention is to prevent over-deflection of a tongue. For a terminal fitting (30) which protrudes a tongue (32) from between U-shaped side-walls (31a and 31b), preventing the deflection of tongue (32) from being deflected up to a lower side-wall (31a) at insertion in a reverse direction with one side-wall (31b) being made higher than the other side-wall (31a), while for a connector housing (10) making the terminal fitting (30) unable to run into a side of a plate housing area (12) via an opening (13) by forming a protruded bar (13a) to which only lower side-wall (31a) runs against the edge of the opening (13) which connects a terminal housing area (11) and plate housing area (12). It is made possible for higher side-wall (31b) to run into the opening (13). Therefore, the terminal fitting (30) can be inserted without any problems in a normal direction, while for insertion in a reverse direction higher side-wall (31b) protects the tongue (32) from over-deflecting.

Description: The present invention relates to a joint connector in which a plurality of terminal fittings are housed in a connector housing for electrically connecting them, its terminal fitting, and its connector housing. A connector as published in Japanese Unexamined Patent Publication No. (Hei) 6-333628 and in US-A-5,403,204 and as shown in Fig. 6 has conventionally been known as this kind of joint connector. A terminal fitting 1 is formed by protruding a tongue 3 which is folded like a mountain form between two U-shaped folded side-walls 2, and is then housed in a cavity 5 in a connector housing 4. The connector housing 4 is formed with cavities 5 provided in five lines in a horizontal direction in two upper and lower stages, and is provided with a plate housing area 7 to which a conducting plate 6 with tabs in five cavities aligned upper and lower stages is inserted. In this case, the plate housing area 7 and cavities 5 of the upper and lower stages are connected with the above-mentioned tongue 3 through a respective passable narrow-width opening 8. When a conductive plate 6 is inserted in a plate housing area 7, the conductive plate 6 is faced through an opening 8 with each cavity 5. When inserting a terminal fitting 1 with the tongue 3 directed towards the opening 8, the tongue 3 tries to protrude the opening 8 towards the plate housing area 7, and consequently becomes conductive by being pressed against the conducting plate 6 which is housed in the plate housing area 7. In this case, the side-walls 2 are positioned in an inner surface of cavity 5 and is made direct contact with the edge of the opening 8. With the point connector as mentioned above, there has been a problem that a tongue 3 is over-deflected when a terminal fitting is erroneously inserted in a reverse direction. The present invention was made in consideration of the above mentioned problem, for the purpose of providing a joint connector capable of preventing over-deflection of the tongue of a terminal fitting. This problem is solved by a joint connector in accordance with claim 7, comprising a terminal fitting in accordance with claim 1, and a connector housing in accordance with claim 4. Thus, the present invention provides a joint connector, which protrude a tongue alone towards a plate holding area by a proper amount by holding the terminal fitting in a cavity when the terminal fitting is inserted in a normal direction, and then a higher side of side-walls prevent the tongue from over-deflecting when the terminal fitting should be inserted in a reverse direction. In addition, by making one side of the side-wall higher, a lower side of side-walls makes contact with the opening edge when inserted in a normal direction, while an edge on the opposite side to the higher side of side-walls makes contact with the opening edge when inserted in a reverse direction, thereby allowing insertion to be prevented. This invention and its further advantages can be more fully understood from the following illustrative description, which is to be taken in conjunction with the accompanying drawings, in which: Fig. 1 shows a perspective view of a joint connector relating to an embodiment of the present invention; Fig. 2 is an enlarged view of an essential part showing the opening of terminal housing area; Fig. 3 is a front view of terminal fitting; Fig. 4 is a sectional view of joint connector in case of insertion in a normal direction; Fig. 5 is a sectional view of joint connector in case of insertion in a reverse direction; Fig. 6 is a perspective view of conventional joint connector; and Fig. 7 is a sectional view in case of insertion in a reverse direction with regard to the same front connection. A description of the embodiment of the present invention follows below in reference to the drawings. Fig. 1 shows a perspective view of a joint connector with regard to one embodiment of the present invention. In Fig. 1, a connector housing 10 formed with a plurality of terminal housing areas 11 divided into upper and lower stages 11b, 11a forms a plate housing area 12 which houses a conducting plate 20 between said upper and lower stages 11b, 11a of said terminal housing areas 11. A tongue 32 is contacting the plate 20 housed in said plate housing area 12 when a terminal fitting 30 which protrudes the tongue 32 between U-shape side-walls 31a and 31b is housed in one of the terminal housing areas 11. The connector housing 10 has the form of a cylinder with an outer circumferential wall and an opening in one side, and forms the terminal housing areas 11 with the upper and lower stages 11b, 11a forming a bulk from an opening side towards the inside of the housing 10. The connector housing 10 comprises a top and a bottom outer circumferential wall area 10a and 10b and left and right outer circumferential wall areas 10c and 10d connecting said top and bottom outer circumferential wall areas 10a and 10b at their edges. There are six lower stage terminal housing areas 11a of the same size and four larger upper stage terminal housing areas 11b. Between the upper and lower stages 11b, 11a a plate housing area 12 is formed which is a space into which the plate-shape conducting plate 20 can be inserted. Each terminal housing area 11 has an opening 13. The edge of each opening 13, as shown in Fig. 2, is surrounded by said top and bottom outer circumferential wall areas 10a and 10b, respectively, two side walls 14 extending from the top and bottom outer circumferential wall areas 10a and 10b, respectively, towards said plate housing area 12, and at least one protrusion 13a extending from one of the two said side walls 14 or the left and right outer circumferential wall areas 10c and 10d, respectively, in a direction perpendiclular to said side walls 14 over a lenght smaller than the width of said housing areas 11a, 11b. Preferably, the length of the protrusions 13a is approximately equal to the width of the side walls 31a and 31b of the contact portion 33. The conducting plate 20 is a plate member which allows insertion into plate housing area 12 between upper and lower terminal housing areas 11 in the above-mentioned upper and lower stages 11b, 11a. The tip side of the conducting plate 20 is structured with a contact area 21 separated in a tab form so as to be inserted between the openings 13 arranged opposed to each other, and the back end of of the conducting plate 20 is structured with a connecting area 22 connecting each contact area 21. Each separated contact area 21 forms a rectangular shape, the side of which has projections 23 for preventing itself from withdrawing. The plate housing area 12 is on its left and right side limited by parts 10b of the circumferential wall 10a. The projection 23 of the contact area 21 advances while contacting with the parts 10b of the circumferential wall 10a when the conducting plate 20 is inserted into the plate housing area 12, thereby making it hard to withdraw at a standstill position. The terminal fitting 30 is formed with a contact portion 33 comprising side-walls 31a and 31b and the tongue 32 on the tip side having a topmost part 32a. The topmost part 32a of tongue 32 extends beyond the height of both side-walls 31a and 31b. The contact portion 33 which contacts with contact area 21 of the conducting plate 20, is connected with a barrel area 34 which holds a connecting cable 40 for connection with the back end side. The side-walls 31a and 31b of the contact portion 33 have both side areas raised. A tip side of the contact portion 33 has a width which can enter between the side-walls 31a and 31b, and is curved so as to fold back the tongue 32 formed in a long rectangle towards the sides of the side-walls 31a and 31b, thereby retaining a structure with elasticity like a spring. In addition, a guide or speeds protrusion 31c is cut out and bent away from a bottom part 31e of the contact portion and extends away in the direction opposite to the extending direction of the higher side-wall 31b downward. Due to cutting out the guide projection 31c a lock hole 31d in the bottom part 31e on the side opposite to the side of the tongue 32 is formed. Furthermore, on the inside of the top and bottom circumferential wall areas 10a and 10b in each upper and lower terminal housing area 11b, 11a a guide groove 15 is formed into which the guide protrusion 31c can be inserted upon proper insertion of the terminal fittings 30 into the upper and lower terminal housing areas 11b, 11a. In the top and bottom circumferential wall areas 10a and 10b resin lances 16 for each upper and lower terminal housing area 11b, 11a are formed corresponding to the lock hole 31d. Upon insertion of the terminal fitting 30 into the terminal housing 11 the lance 16 snaps into the lock hole 31d when the terminal fitting 30 is in its lock position. The side-walls 31a and 31b of the contact portion 33 are arranged in respective different heights as shown in Fig. 3. That is, the side-wall 31a on a side which forms the protrusion 13a in the 13 is low, while the side-wall 31b on the other side is made higher. The height of the side-wall 31b is made so high that the tongue 32 does not loose flexibility when it is deflected in depth between the side-walls 31a and 31b. The afore described embodiments composed of the connector housing 10, conducting plate 20, and terminal fitting 30 of the described structure. However, modifications within the scope of the claims are possible. For example, with the connector housing 10, it is only acceptable if the above-mentioned terminal fitting 30 can be housed, arrangements such as the upper and lower stages 11b, 11a or the six columns in horizontal direction can easily be modified. However, with the opening 13 through which tongue 32 runs, among U-shape side-walls 31a and 31b, arrangements should be so made that the lower side-wall 31 should run against protrusion 13a. However, even in this case, instead of forming one protrusion or protruded bar 13a on one side of the opening 13 as in the above embodiment, two protrusions 23 may be formed extending away from one side wall 14 into different directions. Also as for the terminal fitting 30 of the present embodiment, although one side-wall 31b is formed higher along its full length than other side-wall 31a, even such a smaller area as at protruded tongue 32 alone can be made higher. That is, when pushed against as flat surface from a side the tongue 32 and then an edge of one side-wall 31b is run against, it is only enough if the tongue 32 does not deflect too much. With reference to Fig. 4 a description follows below of an action of the present embodiment which is structured as mentioned above. First of all, on inserting the conducting plate 20 into the connector housing 10, the contact area 21 of the conducting plate 20 is inserted up to a position at which it faces with a notch 12a formed in a terminal housing area 11. With the present embodiment, conducting areas 21 of the conducting plate 20 are faced with the notch areas 12a in all the terminal housing areas 11. As shown in Fig. 4, in case a tongue 32 of the terminal fitting 30 is in a normal insertion direction which is a direction with the tongue 32 facing the plate housing area 12, both side-walls 31a and 31b of the terminal fitting 30 are inserted along the side-walls 14 in the terminal housing area 11. In this case, the shorter side-wall 31a runs against protrusion 13a on the edge of the opening 13, while the longer side-wall 31b is in a state extending beyond the protrusion 13a. The tongue 32 also runs through the opening 13 and protrudes to the plate housing area 12. In the plate housing area 12, the conducting plate 20 is pre-inserted, and the tongue 32 becomes conductive by being pushed against a contact area 21 of the conducting plate 20. Then, keeping inserting up to a depth, the guide projection 31c enters into guide groove 15, and is then kept inserting along this. Contrary to this, as shown in Fig. 5, in case the tongue 32 of terminal fitting 30 is in a reverse insertion direction, the tongue 32 facing towards lance 16 is deflected by being pushed against the inside of the top or bottom circumferential wall areas 10a, 10b. However, when the tongue 32 is deflected to a certain degree it does not deflect any more as the higher side-wall 31b runs against the inside of the top or bottom circumferential wall areas 10a, 10b. As mentioned above, up to the height of the side-wall 31b, the tongue 32 can return even when deflected, and in this manner, an over-deflection can be prevented. With the present embodiment, as shown in Fig. 5, as the end side of the opening of the terminal housing area 11 is widely formed, the terminal fitting 30 can be partially inserted into the terminal housing area 11 even if insertion is in a reverse direction. However, when the size is not made such large, reverse insertion itself can also be prevented. If the terminal fitting 30 is inserted in a reverse direction, because a higher side of side-wall 31b faces with a side of protrusion 13a on the edge of opening 13, the tip side of the insertion direction of the side-wall 31b runs against the end of edge side of the opening of protrusion 13a. A reverse insertion itself can be prevented by making the length of guide protrusion 31c longer, but, if the guide protrusion is made longer, it stands in the way even when inserted in a normal direction, and hence is unfavorable because of the connector housing becoming longer in size. According to the present invention, for a terminal fitting 30 which protrudes the topmost part 32a of a tongue 32 from between U-shaped side-walls 31a and 31b over-deflection of the tongue 32 is prevented, i. e. deflection of the tongue 32 down to the lower side-wall 31a upon insertion in a reverse direction, by making one side-wall 31b being higher than the other side-wall 31a. The connector housing 10 according to the present invention comprising the terminal housings 11 is formed to make it for the terminal fitting 30 unable to run into a side of the plate housing area 12 via an opening 13 by forming a protruded bar 13a to which only the lower side-wall 31a runs against, while only the higher side-wall 31b extends beyond the protrusion 13a. Therefore, the terminal fitting 30 can be inserted without any problems in a normal direction, while for an insertion in a reverse direction a higher side-wall 31b protects the tongue 32 from over-deflection.

Claims: A terminal fitting (30) having a barrel portion (34) to be connected to a cable (40) and a U-shaped contact portion (33) comprising a bottom part (31e), two side walls (31a, 31b) and a tongue (32) protruding from the bottom part (31e) between the two side walls (31a, 31b), a topmost part (32a) of the tongue (32) extending beyond the two side walls (31a, 31b), characterized in that one of the side walls (31b) is in direction of the protruding tongue (32) at least in the area of the topmost part (32a) of the tongue (32) higher than the other side wall (31a) so that it is not insertable at one portion of a housing area (11a, 11b) of a connector housing (10) being adapted to the height of the lower side wall (31a). The terminal fitting of claim 1, wherein one side wall (31b) is higher than the other side wall (31a) throughout its entire length. The terminal fitting of claim 1 or 2, further comprising a guide projection (31c) cut out and bent away from the bottom part (31e), thereby forming a lock hole (31d) in the bottom part (31e), said guide projection extending away from the higher side wall (31b) in a direction opposite to the protruding direction of the tongue (32). A connector housing (10) for housing a plurality of terminal fittings (30), comprising an outer circumferential wall, a plurality of openings (13) having side walls (14), each of said side walls (14) forming an upper and a lower housing area (11b, 11a) for receiving terminal fittings (30) and a plate housing area (12) between said upper and lower terminal housing areas (11b, 11a), each of said side walls (14) extends towards said plate housing area (12), and a conducting plate (20) to be inserted into said plate housing area (12), characterized in that each of said upper and lower terminal housing areas (11b, 11a) comprises a protrusion (13a) adjacent the plate housing area (12), said protrusions (13a) extending from one of the two said side walls (14) in a direction perpendicular to said side walls (14) over a lenght smaller than the width of said terminal housing areas (11a, 11b) and create an insertion height at said one side wall (14) being adapted to the height of a lower side wall (31a) of a terminal fitting (30) so that a higher side wall (31b) of the terminal fitting (30) may not be inserted at the side wall (14) having the protrusion (13a). The connector housing of claim 4, wherein the length of the protrusions (13a) is approximately the width of the lower side-wall (31a). The connector housing of claims 4 or 5, wherein said outer circumferential wall has a top and a bottom outer circumferential wall area (10a, 10b) and left and right outer circumferential wall areas (10c, 10d) connecting said top and bottom outer circumferential wall areas at their edges. A joint connector comprising a plurality of terminal fittings (30) in accordance with anyone of claims 1 to 3 and a connector housing (10) in accordance with anyone of claims 4 to 6, wherein the lower side wall (31a) has a height adapted to the height of the housing areas (11a, 11b) along the side walls (14) between the protrusion (13a) and the bottom (10b) or top (10a) of each housing area (11a, 11b), and wherein the higher side wall (31b) of a terminal fitting (30) may not be inserted at the side wall (14) having the protrusion (13a).

Inventors: CHISHIMA MASAMITSU, ITO TOMONARI, CHISHIMA, MASAMITSU, ITO, TOMONARI
Applicants: SUMITOMO WIRING SYSTEMS, SUMITOMO WIRING SYSTEMS, LTD.
Application year: 1996
Main classification: H01R13
IPC codes: H01R31, H01R13