Connector housing with a hood portion

Abstract: A connector apparatus has a housing, terminal receiving chambers into which terminals are inserted, and a terminal fixing front holder which is fitted in the housing from the front end portion of the housing. The terminal fixing front holder has a pull-out portion and a pull-out guide portion extending inward from the front wall portion, whereas an opening for use in inserting a jig is bored in a front wall portion in order to smoothly pull out the front holder.

Description: BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a connector for electrical wiring and more particularly to the construction of an improved positive terminal connector. Background As shown in Figs. 5 through 7, for example, a typical conventional connector apparatus has been constructed so that its housing collectively accommodates a plurality of positive or negative terminals each connected to a plurality of electrical wires and that it is detachable from the wires. An example of such a connector apparatus is described in JP-A 8-287989 (not prepublished before the priority date of the present application). Fig. 5 is a partial cutaway perspective view of a conventional connector 1, Fig. 6 is a vertical sectional view of the connector 1, and Fig. 7 is a vertical sectional view of another conventional connector 1. Such a conventional connector 1 includes a housing 2 made of injection-molded synthetic resin, a front holder 3 for fixing terminals, waterproofing plugs 4 and a plurality of positive terminals 6 each connected to electrical wires. The housing 2 has a hood portion 2a for protecting the positive terminals 6, in which hood portion a plurality of terminal receiving chambers 7 are bored, whereby the electrical joints 6a of the plurality of positive terminals 6 can separately be fitted in the respective chambers. Further, on the inner wall of each terminal receiving chamber 7 is a lance 9 having a protrusion capable of mating with a recess 8 formed in the body of the positive terminal 6. The front holder 3 is inserted from the open end of the hood portion 2a having a plurality of spacers 12 and forming the front end portion of the housing 2, whereas tip ends of the positive terminals 6 are each passed through a plurality of holes 11 bored in the front wall portion 10 of the front holder 3 for fixing the terminals. Further, the plurality of spacers 12 extended from the front wall portion 10 are fitted into respective apertures 13 cut in a manner adjacent to the respective terminal receiving chambers 7 within the housing 2. The deflection of the lance 9 is regulated by the spacer 12 fitted into the aperture 13, so that the positive terminal 6 is completely fixed as the retaining protrusion provided for the lance 9 mates with the recess 8 of the positive terminal 6. The waterproofing plug 4 attached to the wire is fitted into one end portion of the housing 2 to hermetically seal each wire passed therethrough. The conventional connector 1 is made so that it is necessary to remove by sheer force the front holder 3 press-fitted into the hood portion 2a of the housing 2 for the purpose of inspecting and maintaining the vicinity of the terminals 6. Therefore, as shown in Fig. 6, an inserted guide piece 14 has been made to stick out of the front wall portion 10 of the front holder 3 for fixing the terminals and an opening 15 has also been bored therein so that the retaining head 17 of a pull-out tool 16 having a substantially L-shaped section is allowed to engage with the opening. Since the opening 15 is directed to the inner wall face of the hood portion 2a of the housing 2, however, the tip end of the retaining head 17 abuts against the inner wall face of the hood portion 2a via the opening 15 when the front holder 3 is pulled out and tends to scratch the inner wall face as the front holder is pulled out in the direction of an arrow A. Consequently, the scratches have constituted a primary factor in causing the trouble of hampering the smooth insertion and coupling of negative terminals (not shown) to the connector. In order to cope with the trouble above, it has been proposed to do away with passing the inserted guide piece 14 therethrough by cutting a shallow long groove 18 in the surface thereof instead, as shown in Fig. 7. However, the groove allows the retaining head 17 to easily come off the opening because it is shallow and scratches are unavoidably left on the inner wall face of the hood portion 2a. SUMMARY OF THE INVENTION An object of the present invention intended to solve the foregoing problems with the conventional connector apparatus is to provide a connector apparatus allowing its front holder to be pulled out smoothly. The above object of the present invention is accomplished by a connector apparatus according to claim 1. Further preferred embodiments are claimed in the subclaims. Further, since the internal space sectioned with the spacer portion, the front wall portion and the pull-out guide portion is completely surrounded therewith in such a condition that the retaining head of the pull-out tool is pulled out, the inner wall face of the hood portion is suppressed from being scratched thereby while the pull-out tool is inserted and pulled out. Further, since the pull-out guide portion can be extended up to substantially the same length of the spacer portion, the inner wall face of the hood portion is effectively suppressed from being scratched by the retaining head of the pull-out tool and the front holder is never unsmoothly pulled out when it is pulled out because it is prevented from tilting in the hood portion. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a vertical sectional view of a connector having positive terminals in a connector according to the present invention; Fig. 2 is a perspective view of a front portion of a front holder in the connector according to the present invention; Fig. 3 is a vertical sectional view of an example of a modified connector according to the present invention; Fig. 4 is a vertical sectional view of an example of another modified connector according to the present invention; Fig. 5 is a perspective view of a front portion of a front holder in a conventional connector; Fig. 6 is a vertical sectional view of a connector having positive terminals in the conventional connector apparatus; Fig. 7 is a vertical sectional view of another connector having positive terminals in another connector apparatus; Fig. 8 is a perspective view of a front portion of the other modified front holder in the connector according to the present invention; Fig. 9 is a perspective view of a front portion of the other modified front holder in the connector according to the present invention; and Fig. 10 is an enlarged view of a dot circle X indicated in Fig. 9. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A detailed description will subsequently be given of a connector embodying the present invention with reference to the accompanying drawings. A connector according to the present invention is similar in construction to the conventional connector apparatus except for the front holder. As shown in Figs. 1 and 2, a connector 1' includes a housing 2' made of injection-molded synthetic resin, waterproofing plugs 4' and a plurality of positive terminals 6' each connected to electrical wires. The housing 2' has a hood portion 2a' for protecting the positive terminals 6', in which a plurality of terminal receiving chambers 7' are bored therethrough, whereby the electrical joints 6a' of the plurality of positive terminals 6' can separately be fitted in the respective chambers 7'. Further, in the inner wall of each terminal receiving chamber 7', there is a lance 9' having a protrusion capable of mating with a recess 8' formed in the body of the positive terminal 6'. The waterproofing plug 4' attached to the wire is fitted into one terminal-insertion end portion of the housing 2' to hermetically seal each wire. Like the conventional front holder 3, on the other hand, a front holder 20 according to the preferred embodiment of the present invention is inserted from the hood portion 2a' forming the front end portion of the housing 2' and the electrical joints 6a' of the positive terminals 6' are each passed through a plurality of holes 11' bored in a front wall portion 10', whereas a plurality of spacers 12' extending from the front wall portion 10' are fitted into respective apertures 13' as deflection spaces of the lances 9' cut in a manner adjacent to the respective terminal receiving chambers 7' within the housing 2'. The deflection of the lance 9' is regulated by the spacer 12' fitted into the aperture 13', and the lance 9' is completely fixed in such a state that it is kept engaging with the recess of the positive terminals 6'. Further, a preferred embodiment of the present invention features that the front holder 20 has an inserted guide piece 14' and a pull-out guide member 22 extending inward and outward along the same axial line from the front wall portion 10' and that an opening 23 is bored in the front wall portion 10' along the axial line. Incidentally, the opening 23 has an open portion large enough to make the whole retaining head 17 pass therethrough and an adjoining pull-out portion 21 whose opening is slightly low so as to allow the engagement of the front wall portion 10' with the retaining head 17, whereby the opening 23 has a stepped upper edge. As shown in Fig. 3, further, the front holder 20 may be arranged so that the retaining head 17 of the pull-out tool 16 engaging with the pull-out portion 21 is completely surrounded by enlarging an internal space 24 sectioned with the rear portions 12a' of the spacers 12', the front wall portion 10' and the pull-out guide member 22 by making the projected length of the pull-out guide member 22 substantially equal to the projected length of the spacer 12'. When the pull-out guide member 22 is extended, it is preferred to add an auxiliary rib 25 in order to prevent the pull-out guide member from deflecting. As shown in Fig. 4, the aforementioned front holder 20 of the connector apparatus according to the present invention is also applicable to a connector 30 equipped with a mat seal 31 and a mat seal cover 32 in place of the waterproofing plugs of the connector 1 shown in Figs. 1 and 3. The front holder is not limited in shape to what has been defined in the aforementioned embodiment of the present invention but may be an engaging piece in direct engagement with a terminal instead of the spacer. In the connector according to a preferred embodiment of the present invention including the housing 2', the terminal receiving chambers 7' into which the terminals 6' are inserted, and the terminal fixing front holder 20 which is fitted in the housing 2' from the front end portion of the housing 2', the terminal fixing front holder 20 has the pull-out portion 21 and the pull-out guide member 22 extending inward from the front wall portion 10', whereas the opening 23 for use in inserting the pull-out tool 16 is bored in the front wall portion 10', whereby the whole front holder 20 is smoothly guided and pulled out by the pull-out portion 21 and the pull-out guide member 22 via the front wall portion 10' in parallel to the inner wall face of the hood portion 2a' of the housing 2'. It is thus possible to effectively suppress the inner wall face of the hood portion 2a' from being damagingly scratched against the coupling operation of the connector. In the connector according to the preferred embodiment of the present invention, further, since the pull-out portion 21 is formed between the front wall portion 10' and the rear portion 12a' of the spacer portion 12' extending inward from the front wall portion 10' along the same axial line as that of the pull-out guide portion 22, it is ensured that the retaining head 17 of the pull-out tool 16 engages with the pull-out portion 21 without touching the inner wall face of the hood portion 2a'. In the connector according to the preferred embodiment of the present invention, since the internal space 24 sectioned with the spacer portion 12', the front wall portion 10' and the pull-out guide portion 22 is completely surrounded therewith in such a condition that the retaining head 17 of the pull-out tool 16 is pulled out, the inner wall face of the hood portion 2a' can be suppressed from being scratched thereby while the pull-out tool 16 is inserted and pulled out. In the connector according to the present invention, further, since the pull-out guide portion 22 is extended up to substantially the same length of the spacer portion 12', the internal space surrounding the retaining head 17 of the pull-out tool 16 is enlarged and the parallel guide function of the extended pull-out guide piece 22 is increased, whereby the inner wall face of the hood portion 2a' is effectively suppressed from being scratched by the retaining head 17. Moreover, the front holder is never unsmoothly pulled out when it is pulled out as it is prevented from tilting in the hood portion. However there has been described in connection with the preferred embodiment of the invention, of course, it is possible to variously change and modify the connector in view of the aspect of the invention. According to a second embodiment of the invention, as shown in Fig. 8, in place of the opening 23 bored in the front wall portion 10' with the stepped upper edge, a groove 35 for use in inserting the pull-out tool 16 is extended in the surfaces of the inserted guide piece 14" and the pull-out guide member 22 to effect modification in that the height of the upper edge of the opening 23 is uniformized. As shown in Fig. 9, in place of the opening 23 bored in the front wall portion 10' with the stepped upper edge, an opening 23' for allowing the insertion of the pull-out tool 16 may be bored in a front wall portion 10" to effect modification in that the height of the upper edge of the opening 23' is uniformized. According to the aspect of the invention, as shown in Fig. 10, the pull-out tool 16 engages with a rear surface of the front wall portion 10" about the opening 23' as indicated by arrow A.

Claims: A connector comprising: a housing (2') having a hood portion (2a') formed at the front end thereof and at least one terminal receiving chamber (7'), for receiving at least one terminal (6'), formed in said housing (2'); a front holder (20) inserted from said hood portion (2a') into said housing (2'); said front holder (20) including: a front wall portion (10'), a pull-out portion (21), a pull-out guide member (14; 14'; 14"; 22) formed along an inner wall of said housing (2') and extending from the front wall portion (10') toward said terminal receiving chamber (7'), and an opening (23; 23'), for inserting a pull-out tool (16), provided in said front wall portion (10') between said front wall portion (10') and said pull-out guide member (14; 14'; 14"; 22), or a pull-out guide member (14; 14'; 14"; 22) formed along an inner wall of said housing (2') and extending from the front wall portion (10') toward said terminal receiving chamber (7') and toward said hood portion (2a') and a groove (35) for use in inserting a pull-out tool (16) provided in said pull-out guide member (14; 14'; 14"; 22) between said front wall portion (10') and said pull-out guide member (14; 14'; 14"; 22). The connector of claim 1, wherein said pull-out portion (21) is formed on said front wall portion (10') and a rear portion (12a') of a spacer portion (12') extending toward the terminal receiving chamber (7') from said wall portion (10') along the same axial line as said pull-out guide member (14; 14'; 14"; 22). The connector of claim 1, wherein said pull-out guide member (14'; 22) extends up to substantially the same length of said spacer portion (12'). The connector of one of claim 2 or 3, wherein said pull-out guide member (14; 14'; 14"; 22) is substantially parallel with said spacer portion (12'). The connector of one of claims 1 to 4, wherein said pull-out guide member (14'; 22) has a rib portion (25) formed thereon to prevent said pull-out guide member (14'; 22) from deflecting. The connector of one of claims 1 to 5, wherein said terminal receiving chamber (7') has an aperture (13') and a retaining lance (9') for retaining a terminal (6'). The connector of claim 6, wherein a space (13') is formed between said separation wall and said retaining lance (9'), and wherein said spacer portion (12') is inserted into said space in accordance with the insertion of said front holder (20). The connector of one of claims 1 to 7, wherein an upper edge of said opening (23;23') has a uniformed height. The connector of one of claims 1 to 8, wherein said pull-out guide member (14;14';14"; 22) extends in a direction opposite to said terminal receiving chamber (7') from said front wall portion (10').

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: 1996
Main classification: H01R13
IPC codes: H01R13