Connector with terminal retained in a double manner

Abstract: A connector includes a connector housing (2), terminal receiving chambers (2c) having a retaining lance (2a) for retaining a female terminal (5) by elastic deformation, a front holder (3) for retaining the female terminal (5) relative to the connector housing in a double manner, a retaining arm (3a) for retaining the front holder (3) on the connector housing (2), and a tapered guide portion formed by a slanting surface (2h), formed on the connector housing (2), and a slanting surface (3f) movable in unison with the retaining arm (3a) of the front holder. The retaining arm (3a) is deformable in a direction perpendicular to a direction perpendicular to a direction of deformation of the retaining lance (2a).

Description: BACKGROUND OF THE INVENTION This invention relates to a double retaining connector in which each terminal is retained in a double manner by a retaining lance, provided within a connector housing, and a retaining arm of a front holder. One conventional double retaining connector is shown in Figs. 14 to 16. The illustrated housing is a female one 102 of a pair of connector housings, and each female terminal 105, received in an associated terminal receiving chambers 102c in this female connector housing, is retained in a double manner by a retaining lance 102a, provided at an upper portion of the terminal receiving chamber 102c, and a front holder 103 attached to the female connector housing from the front side of the terminal receiving chambers 102. Referring to the above double retaining construction in further detail, as shown in Figs. 14 and 15, the plurality of terminal receiving chambers 102c are provided in two (upper and lower) rows in the female connector housing 102 made of a synthetic resin, and the retaining lance 102c is provided at an upper portion of each terminal receiving chamber 102c, and extends left (in the drawings) generally horizontally. With this construction, the female terminal 105, inserted and guided into the terminal receiving chamber 102c from the right side (Fig. 16), moves in the terminal receiving chamber 102c, with an upper surface 105b of its terminal portion 105a held in sliding contact with a lower end portion 102a 1 of the retaining lance 102a, and finally when a rear end 105b 1 of the upper surface 105b of the terminal portion 105a passes past the lower end portion 102a 2 of the retaining lance 102a, the retaining lance 102a is elastically restored to an initial position, thereby effecting a first-stage retaining of the female terminal 105. The front holder 103, like the female connector housing 102, is molded of a synthetic resin, and as shown in Figs. 14 and 15, the front holder 103 is attached to the female connector housing 102 from the front side of the terminal receiving chambers 102c of the female connector housing 102. When the front holder 103 is inserted into a front end portion of the female connector housing 102, with its insertion-side end 103e directed toward the female connector housing 102, a provisionally-retaining projection 103g, formed on an upper retaining arm 103f, first slides past an upper retaining projection 102d of the female connector housing 102, and the front holder 103 is provisionally retained on the female connector housing 102. In this condition, when the front holder 103 is further inserted into the female connector housing 102, with a front end 103d of a retaining arm 103a of the front holder 103 lifted in a direction of arrow C (Fig. 15), a retaining projection 103c, formed on the retaining arm 103a, is engaged with a lower retaining projection 102b formed on the female connector housing 102, so that the front holder 103 is fixed relative to the female connector housing 102. As a result, a distal end portion of the retaining arm 103a of the front holder 103 contacts an upper surface 102a 3 of the retaining lance 102a, thereby preventing the retaining lance 102a from upward movement, and therefore the female terminal 105 is retained in a double manner relative to the female connector housing 102. Fig. 15 shows a condition in which the female terminals 105 are retained in a double manner relative to the female connector housing 102. Right, left and lower slanting surfaces 102f are formed on a front end surface 102e of the lower terminal receiving chamber 102c of the female connector housing 102, and also a slanting surface 103b is formed on a front end surface 103h of the retaining arm 103a of the front holder 103, and these slanting surfaces 102f and 103b cooperate with one another to form a tapered guide portion 107 for an insertion port 106 through which a male terminal 104 is engaged with the female terminal 105. In the above construction, as shown in Fig. 15, for engaging the male terminal 104, received in a male connector housing (not shown), with the female terminal 105, a front end portion 104a of the male terminal 104 is first guided into the insertion port 106 by the tapered guide portion 107, and is further moved into the terminal receiving chamber 102c in a direction of arrow D, and is engaged with the front end portion of the female terminal. In the above conventional double retaining connector, however, when a distal end 104b of the front end metallic portion 104a of the male terminal 104 abuts against the upper slanting surface 103b during the insertion of the male terminal 104 into the terminal receiving chamber 102c as shown in Fig. 16, the retaining arm 103a can be moved upward in a direction of arrow E. As a result, the front end metallic portion 104a moves into the terminal receiving chamber 102c without being guided by the slanting surface 103b, and the distal end 104b of the front end portion 104a impinges on an upper portion of the front end surface of the front end portion (terminal portion) 105a of the female terminal 105, so that the male terminal 104 can not move further, and therefore the male terminal 104 can not be engaged with the female terminal 105. EP-A-374 492 according to the pre-characterising part of claim 1 discloses an electrical connector with a double terminal retaining mechanism. The connector comprises a connector housing having a terminal receiving chamber formed within said housing. A female terminal is inserted into the terminal receiving chamber. A retaining lance extends from an inner surface of the terminal receiving chamber which retains said female terminal by elastic deformation. A locking plate is attached to said connector housing from the same side as a male terminal is inserted into the female terminal. The front holder is fixed to the connector housing thereby preventing deformation of the terminal retaining lance and thus retaining the female terminal in a double manner. A retaining arm with a latching pawl is formed integrally with the locking plate which retains the locking plate on the connector by elastic deformation. Tapered guide portions formed as slanting surfaces are formed on said connector housing for guiding the male mating terminal. SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the above conventional double retaining connector, and an object of the invention is to provide a double retaining connector in which a male terminal can be smoothly inserted into a terminal receiving chamber by a tapered guide portion. Another object of the invention is to provide a double retaining connector in which a male terminal can be smoothly inserted into a terminal receiving chamber even when the male terminal to be inserted into an insertion portion abuts against any one of sides of a rectangular, tapered guide portion. According to a first aspect of the invention, there is provided a double retaining connector comprising a connector housing; a terminal receiving chamber formed within the connector housing, a female terminal being inserted into the terminal receiving chamber through one insertion portion thereof while a male terminal is inserted into the terminal receiving chamber through the other insertion portion thereof, and is engaged with the female terminal; a retaining lance which extends from an inner surface of the terminal receiving chamber, and retains the female terminal, received in the terminal receiving chamber, by elastic deformation; a front holder which is attached to the connector housing from that side of the terminal receiving chamber, through which the male terminal is inserted into the chamber, and is fixed to the connector housing, thereby preventing deformation of the retaining lance so as to retain the female terminal relative to the connector housing in a double manner; a retaining arm which is formed integrally with the front holder, and retains the front holder on the connector housing by elastic deformation; and a tapered guide portion for guiding the male terminal into the terminal receiving chamber, the tapered guide portion being formed by a slanting surface, formed on the connector housing, and a slanting surface movable in unison with the retaining arm of the front holder; wherein the retaining arm is deformable in a direction perpendicular to a direction of deformation of the retaining lance. According to a second aspect of the invention, in the double retaining connector of the first aspect of the invention, the insertion portion of the terminal receiving chamber, through which the male terminal is inserted into the terminal receiving chamber, has an opening of a generally rectangular cross-section, and the tapered guide portion is formed around the insertion portion in a generally rectangular shape, and at least part of sides of the tapered guide portion is formed by the slanting surface on the connector housing. In the invention of the first aspect, the retaining arm, which retains the front holder on the connector housing by elastic deformation, is deformable in the direction perpendicular to the direction of deformation of the retaining lance which retains the female terminal, received in the terminal receiving chamber, by elastic deformation. Therefore, the ratio of the slanting surface on the front holder to the tapered guide portion can be kept to a minimum. In the invention of the second aspect, at least part of the sides of the rectangular, tapered guide portion is formed by the slanting surface on the connector housing. Therefore, even when the male terminal to be inserted into the insertion portion abuts against any of the sides of the rectangular, tapered guide portion, the male terminal abuts against the slanting surface on the connector housing which surface is not elastically deformable. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front-elevational view of a preferred embodiment of a double retaining connector of the present invention; Fig. 2 is a cross-sectional view of the double retaining connector taken along line I-I of Fig. 1; Fig. 3 is a cross-sectional view of the double retaining connector taken along line II-II of Fig. 1; Fig. 4 is a cross-sectional view similar to the cross-sectional view taken along line I-I of Fig. 1, showing a completely-retained condition of a connector housing and a front holder of the double retaining connector of Fig. 1; Fig. 5 is a cross-sectional view similar to the cross-sectional view taken along line II-II of Fig. 1, showing the completely-retained condition of the connector housing and the front holder of the double retaining connector of Fig. 1; Fig. 6 is a front-elevational view showing the female connector housing used in the double retaining connector of Fig. 1; Fig. 7 is a cross-sectional view taken along line III-III of Fig. 6; Fig. 8 is a cross-sectional view taken along line IV-IV of Fig. 6; Fig. 9 is a cross-sectional view taken along line V-V of Fig. 6; Fig. 10 is a front-elevational view of the front holder used in the double retaining connector of Fig. 1; Fig. 11 is a cross-sectional view taken along line VI-VI of Fig. 10; Fig. 12 is a cross-sectional view taken along line VII-VII of Fig. 10; Fig. 13 is a cross-sectional view taken along line VIII-VIII of Fig. 10; Fig. 14 is a front-elevational view of a conventional double retaining connector; Fig. 15 is a cross-sectional view taken along line IX-IX of Fig. 14; and Fig. 16 is an enlarged view of a portion X of Fig. 15. DETAILED DESCRIPTION OF THE INVENTION Preferred embodiments of a double retaining connector of the present invention will now be described with reference to the drawings. Figs. 1 to 3 show one preferred embodiment of the double retaining connector of the invention. The double retaining connector 1 of the present invention, like the above conventional double retaining connector 101, comprises a female connector housing 2 and a front holder 3, and further comprises a packing 14 forming a seal between the female connector housing 2 and the front holder 3. As in the conventional double retaining connector, each female terminal 5 is retained in a double manner relative to the female connector housing 2 by a retaining lance 2a, provided in a terminal receiving chamber 2c of the female connector housing 2, and the front holder 3 attached to the female connector housing 2 from the rear side of the terminal receiving chambers 2c. Figs. 6 to 9 show the female connector housing 2. The female connector housing 2 is made of a synthetic resin, and has the plurality of terminal receiving chambers 2c provided within a tubular hood portion 2b for receiving the female terminals 5, respectively. Each terminal receiving chamber 2c has an insertion port 2j for the insertion of the female terminal 5 therethrough, and an insertion port 2k through which a male terminal 4 is inserted to be engaged with the female terminal 5. The retaining lance 2a extends left (in the drawings) generally horizontally from a lower surface of each terminal receiving chamber 2c, and a retaining end 2a 2 for engagement with a terminal metallic portion 5a of the female terminal 5 is formed on an upper end surface 2a 1 of the retaining lance 2a. A slanting surface 2h for guiding the insertion of the male terminal 4 into the terminal receiving chamber 2c is formed around the male terminal insertion port 2k of each terminal receiving chamber 2c. Because of the necessity of molding the retaining lance 2a, this slanting surface 2h can not be formed continuously over the entire periphery of the insertion port 2k, and cooperates with a slanting surface 3f (described later), formed on the front holder 3, to form a tapered guide portion 7 (Fig. 1). As shown in Fig. 7, in the female connector housing 2, a provisionally-retaining projection 2e for engagement with a provisionally-retaining projection 3c on the front holder 3 is formed on a side wall. As shown in Fig. 9, part of the side wall of the intermediate terminal receiving chamber 2c is notched to form an engagement portion 2f which is adapted to be engaged with a completely-retaining projection 3i (described later) of the front holder 3 to thereby fix the front holder 3 relative to the female connector housing 2. An elastic retaining arm 2d is formed on the female connector housing 2, and the female connector housing 2 is retained relative to a mating male connector housing (not shown) by this elastic retaining arm 2d. A packing insertion hole 2m for the insertion of the packing 14 therethrough is formed through a vertical wall 2n. Next, the front holder 3 will be described with reference to Figs. 10 to 13. The front holder 3, like the female connector housing 2, is molded of a synthetic resin, and an internal space of a frame 3j is partitioned by side walls 3k into spaces 3g which communicate respectively with the terminal receiving chambers 2c of the female connector housing 2 when the front holder 3 is attached to the female connector housing 2. A completely-retaining arm 3a, formed integrally with a bottom portion 3m at a front end portion thereof, is in the form of a vertically-extending flat plate, and the completely-retaining projection 3i for engagement with the engagement portion 2f of the female connector housing 2 is formed on an upper edge of the completely-retaining arm 3a. A projection 3h is formed at a free end of the completely-retaining arm 3a, and the completely-retaining arm 3a is elastically deformed left (that is, in a direction of arrow B in Fig. 13) by this projection 3h. The slanting surface 3f is formed at the free end of the completely-retaining arm 3a, and cooperates with the slanting surface 2h of the female connector housing 2 to form the tapered guide portion 7. As clearly shown in Fig. 11, a provisionally-retaining arm 3b extends above the bottom plate 3m, and the provisionally-retaining projection 3c is formed on the provisionally-retaining arm 3b. This provisionally-retaining projection 3c performs its function when the front holder 3 is provisionally retained on the female connector housing 2. An end portion 3e is formed on a lower extension portion 3d of the completely-retaining arm 3a, and functions to cause the female terminal 5 to be retained relative to the female connector housing 2 in a double manner when the front holder 3 is completely retained on the female connector housing 2. As shown in Figs. 2 to 5, the packing 14 is first attached to the female connector housing 2 through the packing insertion hole 2m, and then forms a seal between the female connector housing 2 and the front holder 3 to prevent water or the like from intruding from the exterior into the terminal receiving chambers 2c when the front holder 3 is attached to the female connector housing 2. The operation of the double retaining connector 1 of the above construction will now be described. First, the female terminal 5 is inserted into the terminal receiving chamber 2c of the female connector housing 2, and is fixed therein. More specifically, the female terminal 5, inserted through the female terminal insertion port 2j, moves in the terminal receiving chamber 2c, with a lower surface 5b of the terminal metallic portion 5a held in sliding contact with the upper end surface 2a 1 of the retaining lance 2a, and finally when an engagement end 5b 1 of a retaining hole in the lower surface 5b of the terminal metallic portion 5a passes past the retaining end 2a 2 of the retaining arm 2a, the retaining lance 2a in elastically restored to its initial position, thereby effecting a first-stage retaining of the female terminal 5 by the retaining lance 2a. Then, the front holder 3 is attached to the female connector housing 2 from the front side of the terminal receiving chambers 2c of the female connector housing 2. More specifically, when the front holder 3 is inserted into the front end portion of the female connector housing 2, with its insertion-side end 3e first introduced into the female connector housing 2, the provisionally-retaining projection 3c, formed on the provisionally-retaining arm 3b, first slides past the provisionally-retaining projection 2e on the female connector housing 2, so that the front holder 3 is provisionally retained on the female connector housing 2. In this condition, as shown in Fig. 3, the front end portion 3h of the completely-retaining arm 3a of the front holder 3 is urged and elastically deformed left (that is, in the direction of arrow A), and in this condition, when the front holder 3 is further inserted into the female connector housing 2, the completely-retaining projection 3i, formed on the completely-retaining arm 3a, slides past the engagement portion 2f of the terminal receiving chamber 2c of the female connector housing 2, so that the retaining arm 3a is elastically restored, thereby fixing the front holder relative to the female connector housing 2. This condition is shown in Figs. 4 and 5, and the end portion 3e of the lower extension portion 3d of the front holder 3 is engaged with a lower surface 2a, of the retaining lance 2a to prevent the downward movement of the retaining lance 2a, and therefore the double retaining of the female terminal 5 relative to the female connector 2 is achieved. Fig. 4 shows the condition in which the female terminal 5 is retained relative to the female connector housing 2 in a double manner, and in this condition, the male terminal 4, received in the male connector housing (not shown) passes through an insertion port 6, formed in the front holder 3, and is brought into engagement with the female terminal 5. At this time, a front metallic end portion 4a of the male terminal 4 is guided into the insertion port 6 by the tapered guide portion 7 (Fig. 1), and is further inserted into the terminal receiving chamber 2c to be engaged with the front metallic end portion of the female terminal 5. In the conventional double retaining connector, when the distal end 104b of the front end portion 104a of the male terminal 104 abuts against the upper tapered guide portion 103b, the retaining arm 103a can be moved upward (that is, in the direction of arrow E) as shown in Fig. 16, and as a result, the front metallic end portion 104a moves into the terminal receiving chamber 102c without being guided by the tapered guide portion 103b, and the distal end 104b of the front end portion 104a impinges on the upper portion of the front end surface of the front end portion (terminal portion) 105a of the female terminal 105, so that the male terminal 104 can not move further, and therefore the male terminal 104 can not be engaged with the female terminal 105. In the double retaining connector of the present invention, however, even when a distal end 4b of the front metallic end portion 4a of the male terminal 4 abuts against the upper slanting surface 2h as shown in Fig. 4, an upper wall 2i of the terminal receiving chamber, on which the slanting surface 2h is formed, will not move upward, and the front metallic end portion 4a is suitably guided into the terminal receiving chamber 2c by the slanting surface 2h. As a result, the male terminal 4 can be engaged with the female terminal 5 without impingement of the distal end 4b of the front metallic end portion upon the front upper end portion of the terminal portion 5a of the female terminal 5. In this embodiment, the completely-retaining arm 3a is movable left (Fig. 5), that is, in the direction of arrow F, and therefore when the distal end 4b of the front metallic end portion 4a of the male terminal 4 abuts against the slanting surface 3f formed on the completely-retaining arm 3a, this slanting surface 3f is moved left, and therefore the front end portion 4a moves toward the insertion port 6 without being guided by the slanting surface 3f. However, since the immovable slanting surface 2h on the housing is present in the vicinity of the slanting surface 3f on the front holder, the front metallic end portion 4a of the male terminal 4 is guided by this slanting surface 2h on the housing, so that the male terminal 4 can be engaged with the female terminal 5 without impingement of the distal end 4b of the front metallic end portion 4a upon the side wall of the female terminal 5 at the front end thereof. As described above, in the invention of the first apect, the ratio of the slanting surface on the front holder to the tapered guide portion for guiding the male terminal into the terminal receiving chamber can be kept to a minimum, and therefore the male terminal can be smoothly inserted into the terminal receiving chamber by the tapered guide portion. Further, in the invention of the second aspect, even when the male terminal to be inserted into the insertion portion abuts against any of the sides of the rectangular, tapered guide portion, the male terminal abuts against the slanting surface on the connector housing which surface is not elastically deformable, and therefore the male terminal can be smoothly inserted into the terminal receiving chamber by the tapered guide portion.

Claims: A double retaining connector, comprising: a connector housing (2); a terminal receiving chamber (2c) formed within said connector housing (2), a female terminal (5) being inserted into said terminal receiving chamber (2c) through one insertion portion (2j) thereof while a male terminal (4) is inserted into said terminal receiving chamber (2c) through the other insertion portion (2k) thereof, and is engaged with said female terminal (5); a retaining lance (2a) which extends from an inner surface of said terminal receiving chamber (2c), and retains said female terminal (5), received in said terminal receiving chamber (2c), by elastic deformation; a front holder (3) which is attached to said connector housing (2) from a side of said terminal receiving chamber (2c), through which said male terminal (4) is inserted into said chamber (2c), and is fixed to said connector housing (2), thereby preventing deformation of said retaining lance (2a) so as to retain said female terminal (5) relative to said connector housing (2) in a double manner; a retaining arm (3a) which is formed integrally with said front holder (3), and retains said front holder (3) on said connector housing (2) by elastic deformation; and a tapered guide portion (7) for guiding said male terminal (4) into said terminal receiving chamber (2c), said tapered guide portion (7) being formed of a slanting surface (2h), formed on said connector housing (2), characterised in that said tapered guide portion being formed of a further slanting surface (3f) movable in unison with said retaining arm (3a) of said front holder (3); and said retaining arm (3a) is deformable in a direction perpendicular to a direction of deformation of said retaining lance (2a). A double retaining connector according to claim 1, wherein said insertion portion (2k) of said terminal receiving chamber (2c), through which the male terminal (4) is inserted into said terminal receiving chamber (2c), has an opening of a generally rectangular cross-section, and said tapered guide portion (7) is formed around said insertion portion (2k) in a generally rectangular shape, and at least one part of sides of said tapered guide portion (7) is formed of said slanting surface on said connector housing (2).

Inventors: SUZUKI NAOMI, TOMITA YOSHINORI, SUZUKI, NAOMI, TOMITA, YOSHINORI, Suzuki, Naomi, c/o Yazaki Parts Co., Ltd., Tomita, Yoshinori, c/o Yazaki Parts Co., Ltd.
Applicants: YAZAKI CORP, YAZAKI CORPORATION
Application year: 1997
Main classification: H01R13
IPC codes: H01R13