Terminal double locking connector

Abstract: The connector includes a rear holder inserted into an opening 10 of a connector housing for locking terminals. The holder has a locking portion engaging with a rear end edge of the opening. The locking portion is formed with an inclined stopping surface. The stopping surface is facing in a disengaging direction of the holder and is capable of making a sliding contact with the rear end edge of the opening. The locking portion is a locking projection or may be an inclined stopping surface formed in a rear end portion of the holder. The holder has a base plate, a terminal locking projection, and a pair of side plates. The side plate is formed with a preliminary engagement portion associated with a preliminary locking portion of the connector housing. On final locking of the holder, the fore end face of the rear wall positioned behind the opening of the connector housing abuts against the rear end surface of the base plate of the holder.

Description: The present invention relates to a terminal double locking connector according to the preamble of claim 1. FIGS. 14 and 15 show a known terminal double locking connector disclosed in Japanese Patent Application Laid-open No. H. 8-88042. As illustrated in FIG. 14, a double locking connector 41 has a synthetic resin, male-type connector housing 42, a rear holder 44 joined to the connector housing 42 via a pair of hinges 43, and receptacle-type terminals 45 inserted into the connector housing 42. The rear holder 44 has terminal locking projections 46 in a fore end portion thereof for locking the terminals 45. The rear holder 44 has a final locking projection 47 (FIG. 15) in a rear end thereof for the holder 44 to be locked in the connector housing 42. The preliminary lock projection will not be further discussed herein. In FIG. 15, the connector housing 42 is upside-down as compared with that of FIG. 14 As illustrated in FIG. 15, the connector housing 42 has an opening 48 faced perpendicular to the terminal insertion direction. In a rear end portion of the opening 48, there is provided an engagement groove 49 mating with the final locking projection 47. In a lock released state of the rear holder 44 shown in FIG. 14, the terminal 45 is forwardly inserted into the connector housing 42. The terminal 45 is preliminarily locked by a resilient lock lance 50 (FIG. 15) of the connector housing 42. Next, inserting the rear holder 44 diagonally forward into the connector housing 42 causes the terminal locking projection 46 to further lock the terminal 45 as illustrated in FIG. 15. On releasing of the terminal 45 for maintenance, the rear holder 44 is forcedly unlocked by using a bar tool (not shown) or the like so that the final locking projection 47 disengages from the groove 49 to release the rear holder 44. In FIG. 15, denoted 51 is a female-type connector housing, 52 an opposing pin terminal, 54 a lock arm, 55 a lock projection of the lock arm 54, and 56 an engagement portion associated with the lock projection 55. The rear holder 44 is positioned as opposed to the lock arm 54. However, the known double locking connector has the disadvantage that a repetition of engagement and disengagement of the rear holder 44 causes a wear or a permanent deformation (sagging) of the final locking projection 47, resulted in a reduced engagement force to bring about an unintentional release of the rear holder 44. In addition, a larger clearance between the rear holder 44 and the connector housing 42 tends to disengage the final locking projection 47 from the engagement groove 49, causing disadvantageously an unintentional release of the rear holder 44. Particularly, a larger drawing-out force exerted on an electric cable 53 tends to cause a lock release of the rear holder 44, which reduces the locking force of the terminal 45, resulting in an undesirable disengagement of the terminal 45 from the connector housing 42. Meanwhile, FIGS. 16 and 17 show a known double locking connector disclosed in Japanese Patent Application Laid-open No. H. 8-298152. As illustrated in FIG. 16, the double locking connector 100 consists of a male-type connector housing 103 formed with two-layered upper and lower terminal accommodating chambers 101, 102, a pair of rear holders (retainers) 107, 108 each inserted diagonally forward into one of upper and lower openings 104, 105 formed in a rear part of the connector housing 103, and receptacle-type terminals (not shown) received in the terminal accommodating chambers 101, 102. The pair of rear holders 107, 108 each have a shape different from each other. The connector housing 103 has an upper wall formed with a resilient lock arm 109 for locking an opposing male-type connector (not shown). The lock arm 109 has a lock projection 110 in the middle thereof and has a push projection 111 at a rear end side thereof. The lock projection 110 engages with, for example, an opening formed in a hood wall of an opposing male-type connector housing (not shown). The upper rear holder 107 is inserted into the connector housing 103 with the holder crossing over the lock arm 109, and a narrow middle portion 112 of the rear holder 107 is positioned between the lock projection 110 and the push projection 111. The upper opening 104 communicates with the terminal accommodating chambers 101 by way of entrance holes 113. In a rear end side of the opening 104, there is provided a guide inclined surface 114 for the rear holder 107. In each side portion of the opening 104 of the connector housing 103, there are provided a preliminary lock projection 115, a guide projection 116, and a final locking projection 117, which are associated with one of the rear holders 107, 108. Each rear holder 107 or 108 has a base plate 118 or 119 and terminal locking projections 120 or 121. Each rear holder 107 or 108 has side walls 122, 123, and each side wall 122 or 123 has an engagement recess 124 receiving one of the projections 115 to 117 formed on the side portions of the connector housing 103. The upper rear holder 107 has a raised middle portion which is reduced in width. Meanwhile, the lower rear holder 108 transversely extends straight with a uniform width. Inserting diagonally forward each rear holder 107 or 108 into the opening 104 or 105 of the connector housing 103 allows a preliminary lock of the rear holders 107, 108, as illustrated in FIG. 17. In this preliminary lock state, for example, there may be a clearance L2 between the side wall 122 of the rear holder 107 and a fore end of the opening 104 of the connector housing 103, and there may be also another clearance L3 between the middle portion 112 of the rear holder 107 and the lock projection 110. In the preliminary lock state, the connector housing 103 of the rear holder 107 receives the terminals (not shown) inserted therein. A further advancement of the rear holder 107 abuts a fore end of the rear holder 107 against a fore edge of the opening 104, and the side final locking projections 117 finally lock the rear holder 107. Between the lock projection 110 and the middle portion 112 of the rear holder 107, there is a small clearance of L3 ~ L2. However, the known double locking connector 100 has the disadvantage that the rear holder 107 tends to be unintentionally drawn out diagonally upward along an inclined surface 114 (FIG. 16) of the connector housing 103. This unintentional drawn-out of the finally locked rear holder 107 occurs when an electric cable (not shown) connected to a terminal is forcibly pulled or when a terminal is forcibly pushed rearward on mating with an opposing connector. Particularly, since the connector housing 103 has the final locking projection 117 provided in each side thereof for engaging with the engagement portion 124 of the rear holder 107, the rear holder 107 tends to deflect at its middle part 112 by a forcible pulling force exerted on the electric cable with the terminal. This may cause a disengagement of the rear holder 107 against the lock force of the final locking projections 117. Furthermore, between the lock projection 110 and the middle part 112 of the rear holder 107, there is a small clearance of L3-L2 on a finally locked state of the rear holder 107. Thus, as illustrated in FIG. 18, the width L5 of an engagement portion 126 of an opposing male-type connector housing 125 must be smaller so as to be received within the distance L4 between the lock projection 110 and the push projection 111 of the lock arm 109. This causes a reduced rigidity of the engagement portion 126, resulted in an undesired unlock of the lock arm 109. US-A-5 769 670 describes a connector comprising a connector housing and a rear holder having a rear holder upper plate, wherein a press member having withdrawal prevention retaining portions is suspended from the rear holder upper plate through a hinge. US-A-5 120 269 discloses a connector comprising a connector housing and a rear holder having a rear holder base plate, wherein terminal holder plates are formed on a lower surface of the holder base plate. In view of the disadvantages of the known connectors, an object of the invention is to provide a double locking connector (or a locking structure of a rear holder) having a rear holder which is not unintentionally released from the connector housing when a terminal accommodating in the connector housing receives a force caused by pulling an electric cable connected to the terminal. Particularly, no unintentional release of the rear holder occurs even where there is a comparatively large clearance between the rear holder and the connector housing in a engaged state thereof. Furthermore, the rear holder has a locking force not reduced by a repetition of disengagement of the rear holder from the connector housing. According to the invention, this is achieved by a terminal double looking connector according to the features of the characterizing part of claim 1. Advantageous further embodiments are described in the subclaims. The locking portion of the rear holder may be a locking projection. The rear end of the rear holder may have the inclined stopping face to compose the locking portion. Next, operation of the above-mentioned configurations of the double locking connectors will be discussed. In the configurations of the invention, the connector housing receives the terminal, and the rear holder is inserted into the opening. The rear holder prevents the terminal from being pulled out rearward. When there is a comparatively large clearance between the rear holder and the connector housing so that the rear holder floats in its disengaging direction, the inclined stopping face of the locking portion abuts against the rear end edge of the opening of the connector housing. That is, when the terminal accommodating in the connector housing receives a force caused by pulling an electric cable connected to the terminal so that the rear holder receives the disengaging force, the inclined stopping face slidingly abuts against the rear end edge of the opening of the connector housing. Thereby, the rear holder receives a reaction force in its engaging direction, preventing the rear holder from being released from its final lock state. Next, advantageous effects of the invention will be discussed. As described above, when a terminal, drawing-out force caused by pulling the electric cable, the inclined stopping surface of the rear holder slidingly abuts against the rear end edge of the opening to return the rear holder in its engaging direction within the connector housing. This prevents the unintentional releasing of the rear holder, allowing a reliable locking of the terminals. This advantageous effect is also provided when there is a clearance between the rear holder and the connector housing which causes the rear holder to be floated in its disengaging direction. Furthermore, on intentional disengaging of the rear holder, the inclined stopping surface of the locking portion slides smoothly the rear end edge of the opening. Thus, a repetition of engagement and disengagement of the rear holder causes neither wear nor deformation of the locking portion, preventing the decrease in locking force of the rear holder to keep a reliable locking force for the terminals. Particularly, the locking projection might have an adequate flexibility (resiliency) to prevent furthermore the wear and deformation of the rear holder on its engagement and disengagement. The locking portion might have a sufficient rigidity, causing no deformation of the locking portion even on a repetition of engagement and disengagement of the rear holder. FIG. 1 is an exploded perspective view showing a first e embodiment of a terminal double locking connector according to the present invention, and encircled is an enlarged view of a final locking projection of the connector; FIG. 2 is a longitudinal sectional view showing of a final locking projection of a rear holder of FIG. 1; FIG. 3 is a side view showing a state in which the connector housing is disengaged from the rear holder; FIG. 4 is a longitudinal sectional view showing a state in which the connector housing is disengaged from the rear holder; FIG. 5 is a side view showing a preliminary lock state in which the connector housing has received the rear holder; FIG. 6 is a longitudinal sectional view showing a state in which terminals have been inserted in the connector housing with the rear holder being preliminary locked; FIG. 7 is a side view a state in which the rear holder is inserted into the connector housing; FIG. 8 is a longitudinal sectional view showing a state in which the rear holder is inserted into the connector housing; FIG. 9 is a side view showing a state in which the rear holder is finally locked in the connector housing; FIG. 10 is a longitudinal sectional view showing a state in which the rear holder is finally locked in the connector housing; FIG. 11 is a longitudinal sectional view generally showing an operation of the final locking projection; FIG. 12 is an exploded perspective view showing a second embodiment of a terminal double locking connector according to the present invention; FIG. 13 is a longitudinal sectional view showing the second the embodiment; FIG. 14 is an exploded perspective view showing a known terminal double locking connector; FIG. 15 is a longitudinal sectional view showing an assembled state of the double locking connector of FIG. 14; FIG. 16 is an exploded perspective view showing another known terminal double locking connector; FIG. 17 is a perspective view showing a state in which the rear holder is preliminarily locked in a connector housing regarding the connector of FIG. 16; and FIG. 18 is a longitudinal sectional view generally showing a lock construction of a pair of connector housings of FIG. 16. Referring to the accompanied drawings, embodiments of the present invention will be discussed in detail hereinafter. FIGS. 1 to 11 show a terminal double locking connector 1 according to a first embodiment of the present invention. The double locking connector 1 is an improvement of one that the applicant of the present invention has proposed in Japanese Patent Application No. H. 10-22293. The improvement is related to a locking structure of a rear holder (terminal double locking member) of the double locking connector. As illustrated in FIG. 1, the double locking connector 1 has a synthetic resin, female-type connector housing 2, two synthetic resin rear holders 4 coupled to the connector housing 2 via thin resilient hinges 3, and a plurality of pin-type terminals 26 inserted into a plurality of terminal accommodating chambers 13 of the connector housing 2. Each rear holder 4 has a rear end formed with a pair of left and right final locking projections (locking portions) 14. Each final locking projection 14 has an inclined stopping surface 14a abutting against the connector housing 2. The rear holder 4 has a base plate 5, a plurality of terminal locking projections 6 (FIG. 3) extending from a fore end of the base plate 5, and a side plate 7 vertically formed at each side end of the base plate 5. The side plate 7 is formed with a generally S-shaped guide opening 8. The pair of rear holders 4 each are inserted into one of upper and lower spaces each formed in a rear part of the connector housing 2. The connector housing 2 has upper and lower walls 9 each formed with an opening 10 for receiving one of the rear holders 4. The connector housing 2 also has each side wall 11 formed with a receiving space 12 for receiving a side plate 7 of the rear holder 4. The side plate 7 has a thin thickness to be flexible in its thickness direction. Each side plate 7 is positioned outside the opening 10. The hinge 3 is extending from the upper or lower wall 9 of the connector housing 2 into a fore part of the receiving space 12 and can be curved in the receiving space 12. The other end of the hinge 3 is joined to a fore, side end of the rear holder 4. The rear holder 4 has the plurality of terminal locking projections 6 (FIG. 3) to define a comb-like shape, each of which corresponds to one of the accommodating chambers 13 of the connector housing 2. The base plate 5 has a rear end 5a formed with two final locking projections 14 each of which engages with a rear end edge 10a (FIG. 4) of the opening 10. The final locking projection 14 is triangular in longitudinal section. The final locking projection 14 protrudes backward from the rear end face 5a of the base plate 5 in an opposite side of the terminal locking projections 6. The final locking projection 14 is positioned adjacent to an inner side surface 5b (FIG. 4) of the base plate 5. That is, the final locking projection 14 has a horizontal face 14b which aligns with the inner side surface 5b (FIG. 2) of the base plate 5. The final locking projection 14 has an inclined stopping surface 14a facing to the disengaging direction of the rear holder 4 outside the base plate 5. The inclined stopping surface 14a engages with the rear end edge 10a (FIG. 4) of the opening 10 of the connector housing 2. As illustrated in FIG. 2, the inclined stopping surface 14a is adjacent to the rear end face 5a of the base plate 5. An outward end 14c of the final locking projection 14 is formed in a round shape. Preferably, the stopping surface 14a has an incline angle α of about 30° to 45° The stopping surface 14a, as is further discussed later, provides a sliding surface for the rear end edge 10a (FIG. 4) of the opening 10 of the connector housing 2. A further larger incline angle α of the stopping surface 14a is disadvantageous in slidableness and reduces the final lock force thereof. The pair of left and right final locking projections 14 shown in FIG. 1 cause the transversely elongated rear holder 4 to reliably engage with the connector housing 2. Furthermore, the vertical rear end face 5a of the base plate 5 abuts against a fore end face 29a of a rear wall 29 (FIG. 4) of the connector housing 2, which increases the anal lock force of the terminals. In FIG. 1, there is illustrated the rear holder 4 which is in the preliminary lock state.. In FIG. 3, there is illustrated the rear holder 4 which is in the fully disengaged state thereof. In a side wall 16 for the receiving space 12 of the connector housing 2, there are sequentially disposed a preliminary lock projection (preliminary lock portion) 17, a guide projection 18 for the rear holder 4, and a final lock assisting projection (second guide projection) 19. These projections 17 to 19 is disposed on a phantom inclined line leading to the center of the connector housing 2. The preliminary lock projection 17 and the final lock assisting projection 19 has a height smaller than the guide opening 8. Meanwhile, the intermediate guide projection 18 is a circular column having a height approximately twice larger than the projections 17, 19 and almost the same as the depth of the guide opening 8. The guide projection 18 and the final lock assisting projection 19 each has a head formed with a tapered surface 18a or 19a. As illustrated in FIG. 3, Each distance between any two of the projections 17 to 19 is predetermined to conform to the length of the guide opening 8. Thereby, adjacent two (17 and 18, or 18 and 19) of the three projections 17 to 19 may engage with a fore end portion 8b or a rear end portion 8a of the guide opening 8 of the rear holder 4. The guide opening 8 extends from its rear end portion 8a near the base plate 5 and leads to an elongated horizontal straight groove 8d by way of a steeply inclined groove (preliminary engagement portion) 8c. Then, the guide opening 8 leads to a comparatively gentle sloped groove 8e in the fore side of the straight groove 8d and reaches the fore end portion 8b. In FIG. 3, denoted 6 is the terminal locking projection, and 20 a partition separating the upper and lower receiving spaces 12. FIG. 4 shows a longitudinal sectional view of the connector housing 2 and the rear holder 4. The connector housing 2 has a wall 21 for isolating the symmetrical upper and lower terminal accommodating chambers 13. The wall 21 has a plurality of resilient lock lances 22. The terminal accommodating chambers 13 lead to a forward connector engagement space 15. The opening 10 for inserting the rear holder is opened to the terminal accommodating chamber 13, so that each terminal locking projection 6 of the rear holder 4 may enter one of the terminal accommodating chambers 13. The terminal locking projection 6 is positioned inside the base plate 5 to define a step. At a fore end of the opening 10, there is provided a tapered guide surface 23 for the terminal locking projections 6. Ahead of the tapered guide surface 23, there is provided an entrance face 25 formed in an inner wall 24 of the connector housing 2 for guiding the terminal locking projections 6. The entrance face 25 leads to the terminal accommodating chambers 13. In FIG. 4, denoted 57 is an engagement portion for a lock arm of an opposing male-type connector (not shown), 58 a sliding engagement portion for securing the female-type connector housing 2, and 59 a locking projection for locking the connector housing 2. The female-type connector housing 2 has no lock arm for engagement with the male connector, which is advantageous to keep a space enough for adequately receiving the rear holder 4. FIGS. 5 and 6 show a preliminary lock state of the connector housing 2 and a rear holder 4. As illustrated in FIG. 5, the rear end portion of the guide opening 8 abuts against the preliminary lock projection 17, and the fore end portion 8b of the guide opening 8 abuts against the guide the projection 18. Near and forward a fore end of the side plate 7 of the rear holder 4, there is positioned the final lock assisting projection 19. On engagement of each projection 17, 18 with the guide opening 8, the side plate 7 deflects outward along the tapered guide surface 18a of the guide the projection 18, so that each projection 17 or 18 may smoothly engage with the guide opening 8. The preliminary lock projection 17 having a shorter height than the guide projection 18 allows its smooth engagement with the guide opening 8 even without a tapered guide surface of the preliminary lock projection 17. As illustrated in FIG. 6, in the preliminary lock state of the rear holder 4, the terminals are inserted forward into the terminal accommodating chambers. An engagement opening or an engagement cu-out shoulder 27 of the terminal 26 engages with a projection of the lock lance 22. The terminal locking projection 6 of the rear holder 4 is still within the opening 10. Between the foremost end of the terminal locking projection 6 and the fore end of the opening 10, there is a clearance 28. The base plate 5 of the rear holder 4 is contacting a comparatively thin wall 29 positioned in the rear of the opening 10. The rear wall 29 is a part of the inner wall 24, and a fore end face of the rear wall 29 defines a rear end face of the opening 10. In the preliminary lock state of the rear holder 4 shown in FIG. 5, pushing forward the rear end of the base plate 5 in an arrow head A1 direction provides a pivoting force for the rear holder 4 around the projections 17, 18, particularly around the projection 18. Thus, as illustrated in FIGS. 7 and 8, the head of the rear holder 4 moves inside in an arrow head A2 direction to pivot itself together with advance of the rear holder 4 in the opening 10 of the connector housing. In FIG. 7, the preliminary lock projection 17 is disengaging from the guide opening 8 (at the same time, the side plate 7 is deflecting outward). Meanwhile, the guide the projection 18 is leaving from the short inclined groove 8e (and from the fore end portion 8b) of the guide opening 8 to enter into the straight groove 8d. Furthermore, a fore end portion 7a of the side plate 7 of the rear holder 4 is contacting the final lock assisting projection 19, which enhances the pivoting movement of the rear holder 4 around the final lock assisting projection 19. As illustrated in FIG. 8, the terminal locking projection 6 of the rear holder 4 moves forward from the opening 10 of the connector housing 2 into the terminal accommodating chamber 13 with its pivoting movement. Then, an outer, fore end shoulder 6a of the terminal locking projection 6 contacts an end of the tapered guide surface 23 positioned at the front of the opening 10. With the pushing operation of the rear holder 4, as shown in FIG. 7, the straight groove 8d of the guide opening 8 moves slidingly diagonally along the guide the projection 18. At the same time, as shown in FIG. 8, the fore end shoulder 6a of the terminal locking projection 6 moves slidingly diagonally along the tapered guide surface 23. Thereby, a locking portion 6b which is an inner, fore end part of the terminal locking projection 6 moves diagonally toward the shoulder 26a of the terminal 26. In FIG. 7, the tapered guide surface 19a of the final lock assisting projection 19 forcedly moves under an inside surface of the side plate 7 of the rear holder 4, which deflects the side plate 7. Thereby, as illustrated in FIG. 9, the final lock assisting projection 19 enters the opening 8. With the pushing operation of the rear holder 4, as illustrated in FIG. 9, the guide projection 18 enters into the elongated inclined groove 8c of the guide opening 8 by way of the straight groove 8d. Thereby, the rear holder 4 fully engages with the opening 10 with pivoting in an arrow head A3 direction, which is opposite in direction of the arrow head A2 shown in FIG. 7, toward the terminal insertion direction. FIGS. 9 and 10 show a final lock state of the rear holder 4. As shown in FIG. 9, the final lock assisting the projection 19 engages with the fore end portion 8b of the guide opening 8, and the guide projection 18 engages with the rear end portion 8a of the guide opening 8. The preliminary lock projection 17 has disengaged from the guide opening 8. The final locking projection 14 of the rear holder 4 enters the opening 10 with a deflection thereof. As illustrated in FIG. 10, a root portion 14al of the inclined stopping surface 14a, which is a cross section of the stopping surface 14a and the rear end face 5a of the base plate 5, abuts against the rear end edge 10a (that is, a fore end face comer of the rear side wall 29) of the opening 10. At the same time, the rear end face 5a of the base plate 5 abuts against the fore end face 29a (FIG. 4) of the rear side wall 29 of the connector housing 2. An outer half surface 6c of the terminal locking projection 6 abuts against the entrance face 25, thereby reliably locking the rear holder 4 within the opening 10. When there is a comparatively larger clearance between the rear holder 4 and the connector housing 2 like the known structure, the rear holder 4 tends to move out of the opening 10, that is, to move in an arrow head A4 direction of FIG. 10 (also as illustrated in FIG. 11). This causes a reduced force of the terminal locking projection 6 of FIG. 10 for locking the terminal 26, resulted in disengagement of the terminal 26 due to a forcible pull on an electric cable 35. In the embodiment, as illustrated in FIG. 11, the inclined stopping surface 14a of the final locking projection 14 is abutting against the rear end edge (comer) 10 of the opening 10. Thus, on pulling backward the electric cable 35 of FIG. 10, the rear holder 4 receives a backward force in an arrow head A5 direction of FIG. 11. Thereby, the inclined stopping surface 14a slidingly abuts against the rear end edge 10a of the opening 10, so that the rear holder 4 is pushed inward in the connector housing 2 in an arrow head A6 direction. Accordingly, as illustrated in FIG. 10, the terminal locking projection 6 having a comparatively large abutment area reliably locks the rear shoulder 26a of the terminal 26, which provides a sufficient stopping force for the terminal 26. Furthermore, the rear end face 5a of the base plate 5 of the rear holder 4 abuts against the fore end face 29a (FIG. 4) of the rear side wall 29 of the connector housing 2 to provide a sufficient final lock force. These stopping forces are sufficient also against a disengagement force of the terminal 26 during the mating with an opposing connector. On disengagement of the rear holder 4, the inclined stopping surface 14a of the final locking projection 14 abuts slidingly smoothly against the rear end edge 10a of the opening 10, preventing wear and deformation of the final locking projection 14. The stopping surface 14a having an incline angle α (FIG. 2) of about 30° to 45° allows a sufficient abutment force against the rear end edge 10a. This provides an adequate locking force for the rear holder 4 and enables a smooth reliable abutment of the stopping surface 14a against the rear end edge 10a to resist to a forcible pull exerted on the electric cable 35. In addition, the final locking projection 14 having a thickness to keep its resiliency prevents wear and deformation (sagging) of the rear holder 4 on engagement and disengagement of the rear holder 4. FIGS. 12 and 13 show a second embodiment of a terminal double locking connector according to the present invention. The double locking connector 1' has a rear holder 4' formed with a base plate 5' of which a rear end portion has particularly an inclined stopping surface 14a' directly formed thereon. The stopping surface 14a' has a length across the whole distance between both side plates 7 of the rear holder 4' in a rear end portion of the base plate 5'. The rear end portion of the stopping surface 14a' of the base plate 5' serves as a final locking portion (locking portion) 14'. The components other than the locking portion 14' are the same as the first embodiment and have the same reference numerals. Thus, the same components will not be discussed again. In FIG. 12, denoted 5a' is a rear end face having a small width adjacent to the stopping surface 14a'. In FIG. 13, denoted 5b' is an inner surface of the base plate 5'. The inclined stopping surface 14a' is an outer surface of the base plate 5' facing toward a disengagement direction of the rear holder 4' in the same way as the first embodiment. In FIG. 13, the rear holder 4' is inserted through the opening 10 into the connector housing 2, and the stopping surface 14a' is abutting against the rear end edge 10a of the opening 10 to finally lock the rear holder 4'. In the same way as the first embodiment shown in FIGS. 10 and 11, even when the rear holder 4' moves in its disengaging direction within the opening 10 due to a pull exerted on the terminal 26, the inclined stopping surface 14a' abuts against the rear end edge 10a of the opening 10 with a slide allowance. This provides a pushing-back force for the rear holder within the connector housing 2, preventing disengagement of the rear holder 4'. In place of the inclined stopping surface 14a', there may be provided a final locking portion like a projection (not shown). In addition, it may be possible that the guide projection 18 and the final lock assisting projection 19 of FIG. 9 compose a final locking portion. The construction of each inclined stopping surface 14a or 14a' of the embodiments may be applied to a connector such as the known double locking connector (FIG. 16). It is noted that the terms of "upper" and "lower" are conveniently used to show the position of the components in the accompanied drawings. Practically, the double locking connectors 1 and 1' can be positioned in an upside-down state or can be oriented in a horizontal direction.

Claims: A terminal double locking connector (1) comprising: a connector housing (2) having a wall (9) formed with an opening (10) for receiving a rear holder (4), the opening (10) having a rear end edge (10a) of said wall (9), a terminal (26) inserted into said connector housing (2), and the rear holder (4) for locking the terminal (26), the rear holder (4) having a base plate (5), which is inserted into the opening (10) of said wall (9) of the connector housing (2) in a direction intersecting with the terminal insertion direction, said base plate (5) of said rear holder (4) having at the rear end face (5a) thereof a locking portion (14) being engageable with the rear end edge (10a) of the opening (10), and having its fore end (6) engageable with said connector housing (2), characterized in that said locking portion (14) has an inclined stopping surface (14a) facing in a disengaging direction of said rear holder (4), and the inclined stopping surface (14a) can slide underneath the rear end edge (10a) of the opening (10) of said wall (9) of the connector housing (2) when inserting the rear holder (4) into said opening (10). The double locking connector according to claim 1, said. locking portion (14) of said rear holder (4) is a locking projection (14). The double locking connector according to claim 1, wherein a rear end of said rear holder (4') has an inclined stopping surface (14a') to compose said locking portion (14'). The double locking connector according to claim 1, wherein said rear holder (4) has a guide opening (8) on a side surface thereof and the connector housing (2) is formed with a projection (17, 18, 19) which is engageable with said guide opening (8) when the rear holder (4) is inserted into the connector housing (2).

Inventors: KASHIYAMA MOTOHISA, KASHIYAMA, MOTOHISA, Kashiyama, Motohisa, c/o Yazaki Parts Co., Ltd.
Applicants: YAZAKI CORP, YAZAKI CORPORATION
Application year: 2000
Main classification: H01R13
IPC codes: H01R13