Connector assembly

Abstract: A connector assembly having a receiving housing, a fitting housing and a retainer. The fitting housing is inserted into the receiving housing and is held in engagement position by the retainer. However, if one or more electrical terminals, within cavities in the fitting housing, is not fully inserted into its locked position, the retainer is held in a temporary position wherein a portion thereof projects outwardly of the fitting housing. This portion engages the end face of the receiving housing. The end face is preferably perpendicular to the insertion direction or at an acute angle thereto. As a result, the receiving housing does not distort even if excessive insertion force is applied to the fitting housing and/or the retainer.

Description: The present Invention is directed to a connector assembly comprising a receiving housing, a fitting housing, and a retainer. The construction is such that mis-assembly is substantially prevented. BACKGROUND OF THE INVENTION A typical prior art connector, with female terminal 3 only partially inserted into housing 1, is shown in Figure 9. Housing 1 is adapted to fit inside of hood 5 which is attached to - or part of - the male housing (not shown). Retainer 2 carries a projection which bears against bevel 6 on the end face of hood 5. Lance 4, which serves to lock terminal 3 in position after it has been fully inserted in the cavity is affixed to - or integral with - housing 1. As shown in Figure 9,. it is not yet operative, since female terminal 3 has not been fully inserted into housing 1. However, since the leading edge of hood 5 is provided with bevel 6, the Application of substantial insertion force will cause hood 5 to distort outwardly and permit housing 1 to fully enter hood 5, even though female terminal 3 has not been properly inserted into the cavity. This makes it very difficult or even impossible to determine, after assembly, whether terminal 3 is in its proper position. Moreover, since there are, as shown in Figure 10, a plurality of cavities 7 (each containing terminal 3), it is possible that some terminals 3 will have been properly inserted, while one or more others are in the position shown in Figure 9. In Figure 10, the female terminal in cavity 7 is incompletely inserted. As can be seen from the Figure, the left side of retainer 2 is fully inserted into housing 1, while the right side projects somewhat therefrom. Insertion pressure on housing 1 will cause it to distort hood 5 and enter completely therein. However, terminal 3 in cavity 7 will not make a proper electrical connection with the mating connector and, therefore, the assembly is defective. This cannot be determined by observation. A further prior art connector, corresponding to the preamble of claim 1, is disclosed in EP-A-0 670 500. In this prior art connector the receiving housing or hood does not have a bevel at the entrance opening thereof, whereby the afore mentioned problem will not occur. However, in case of deformation of the receiving housing the unbevelled end face thereof may interfere with the fitting housing and prevent the insertion thereof even if all terminals have been properly inserted in the fitting housing. Summary of the invention It is an object of the present invention to provide a connector assembly wherein, if a terminal is not fully inserted into its corresponding cavity, the retainer and housing cannot be forced into the hood. As a result, visual inspection will readily determine whether all of the terminals are properly inserted into their respective cavities. The object is achieved, according to the invention, with a connector assembly as set out in claim 1. The connector assembly of the present Invention comprises a receiving housing, a fitting housing for insertion therein, and a retainer mounted on the fitting housing. The retainer has a temporary position, wherein an outer portion thereof projects radially outwardly. In this position, if assembly is attempted, the outer portion will abut the end face of the hood. There is a retraining section on the terminal which abuts the retainer when the terminal is not fully inserted and the retainer is in its temporary position. This prevents the retainer from moving from the temporary position to the engagement position, wherein the outer portion does not abut the end face. However, if the terminal is fully inserted, the restraining section is apart from the retainer and the retainer can be moved radially inward to permit ready insertion of the fitting housing and the retainer in the hood. In accordance with the Invention, a radially inward bevel is provided (in the insertion direction) laterally between two end faces. This urges the retainer into its engagement position, provided that the terminals are fully inserted in their respective cavities. In a further embodiment of the present Invention, a receiving cavity is formed on the end faces and a corresponding projection is on the retainer. In the event that the terminal is not fully inserted, the projection will fit into the receiving cavity and be retained therein. This provides added protection against the possibility of the hood being distorted by excess pressure in the insertion direction. BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawings, constituting a part hereof and in which like reference characters indicate like part, Figure 1 is a front elevation of the receiving housing; Figure 2 is a longitudinal cross-section of the fitting housing with the terminal and the housing fully inserted; Figure 3 is a view, similar to that of Figure 2, wherein neither the terminal nor the fitting housing are fully inserted; Figure 4 is an enlarged fragmentary view, partly in section, showing the outer portion of the retainer in contact with the end face of the hood; Figure 5 is a plan view of a partially mis-assembled device of the present Invention; Figure 6 is a bottom view of Figure 5; Figure 7 is an enlarged view, similar to that of Figure 4, showing a modification; Figure 8 is a view, similar to that of Figure 7, showing a further modification; Figure 9 is a view, similar to that of Figure 3, of a prior art device; and Figure 10 is a view, similar to that of Figure 5, of the prior art device of Figure 9. DETAILED DESCRIPTION OF THE INVENTION Receiving housing 10 is provided with hood 12 in which terminals 11 are located. Hood 12 has end surface 12A which comprises bevel 14 and end faces 13. Edge 15 is between bevel 14 and end face 13. Fitting housing 20 contains terminal 21 in terminal cavity 22. As can be seen in Figure 2, terminal 21 is fully inserted in cavity 22 so that engagement section 32 of retainer 30 is immediately adjacent abutment section 25 of terminal 21, thus holding it in its locked or fully inserted position. Bottom plate 33 of retainer 30 is substantially coplanar with inner perimeter surface 12B of hood 12. Retainer attachment hole 24 is provided in housing 20 to accommodate retainer 30 and the latter is provided with hole 31 to allow introduction of terminal 21. In the locked position, lance 23, due to its resilience, engages a complementary portion of terminal 21. Thus, terminal 21 is secured in its locked position both by lance 23 and the combination of engagement section 32 and abutment section 25. In Figures 3 and 4, terminal 21 is not fully inserted into cavity 22. Therefore, the outer portion of retainer 30 bears against end surface 12A of hood 12. Restraining section 35 of terminal 21 prevents retainer 30 from moving radially inward. Since end surface 12A is perpendicular to the insertion direction, hood 12 is not distorted and fitting housing 20 cannot be forced into hood 12. In Figures 5 and 6, the terminals in cavities 22 adjacent the right end of fitting housing 20 are in their partial positions. As a result, projection 34 (Figure 4) bears against end surface 12A of hood 12. This effectively prevents retainer 30 from assuming its engagement position and does not allow fitting housing 20 to be forced into hood 12 of receiving housing 10. The fact of mis-assembly can be readily observed and the defective assembly removed from the production line. A modification is shown in Figure 7. As in the case of Figure 4, the terminal is in its partial position and is not fully inserted into the terminal cavity. Projection 34 on base plate 33 of retainer 30 engages receiving cavity 43 in end surface 42A of hood 42. By virtue of the engagement of the projection in the cavity, retainer 42 and fitting housing 20 cannot be forced into hood 42. Another modification is found in Figure 8. In this case, end surface 52A is at an acute angle to the insertion direction of fitting housing 20. Leading face 51A on bottom plate 51 of retainer 30 is at the same angle as end surface 52A. Thus, hood 52 is urged radially inward by the insertion force, but it cannot move in that direction because of the presence of fitting housing 20. Therefore, it is virtually impossible to distort hood 52 and force retainer 30 into the hood. Although only a specific embodiment of the present Invention has been expressly disclosed, such variations as would be apparent to the person of ordinary skill may be made without departing from the scope of the claims. The receiving housing has been described as having a hood into which the fitting housing is inserted. However, the hood is unnecessary; a suitably shaped receiving housing is also operable in accordance with the Invention. The projection on the outer portion of the retainer can be eliminated provided that the end face of the hood (or receiving housing) is perpendicular or at an acute angle to the insertion path of the fitting housing. In this case, it is preferable that the leading face of the retainer match the end face on the hood. These and other changes may be made in the Invention without departing from the scope of the claims.

Claims: A connector assembly comprising a receiving housing (10), a fitting housing (20) adapted for insertion into said receiving housing in an insertion direction along a longitudinal insertion path, and a retainer (30), mounted on said fitting housing (20) for movement in a direction perpendicular to said insertion direction, said retainer (30) having a temporary position, wherein an outer portion (34) of said retainer (30) projects radially outwardly of one side of said fitting housing and is adapted to abut an end surface (12A, 42A, 52A) of said receiving housing (10) when said fitting housing (20) is moved in said insertion direction, thereby to prevent insertion of said fitting housing (20) into said receiving housing (10), said retainer (30) having an engagement position, wherein said outer portion (34) does not abut said end face (13), thereby permitting said insertion, said fitting housing (20) having at least one terminal cavity (22), an electrical terminal (21) in said cavity, said terminal (21) being capable of having a locked position, wherein said terminal is fully inserted in said cavity, and a partial position wherein said terminal is spaced apart from said locked position along a withdrawal path in a release direction opposite to said insertion direction, said terminal (21) having a restraining section (35) which contacts said retainer (30) when said terminal is in said partial position and said retainer is in said temporary position, thereby preventing said retainer (30) from moving from said temporary position to said engagement position, said restraining section (35) being out of contact with said retainer (30) when said terminal (21) is in said locked position, characterized in that said end surface (12A, 42A, 52A) comprises two end faces (13) spaced in a transverse direction to the insertion direction, for abutment with said outer portion (34) of said retainer (30), and a bevel (14) between said two end faces (13), the bevel (14) slanting radially inward in said insertion direction. The connector assembly of claim 1, wherein said end face (13) is perpendicular or at an acute angle sloping radially outwardly with respect to said insertion direction. The connector assembly of claim 1, wherein each end face (13) has a receiving cavity (43) and said outer portion of the retainer (30) has a projection (34) entering said receiving cavity (43) when said retainer (30) is in said temporary position. The connector assembly of any of claims 1 to 3, comprising an abutment section (25) on said terminal (21), said retainer (30) having a engagement section (32) abutting said abutment section (25) when said terminal (21) is in said locked position and said retainer (30) is in said engagement position. The connector assembly of any of claims 1 to 4, wherein said receiving housing (10) is provided with a hood (12, 42, 52), said fitting housing (20) being adapted for insertion into said housing and said end surface (12A, 42A, 52A) being on said hood.

Inventors: FUJITANI MITSUHIRO, MATSUSHITA YASUO, FUJITANI, MITSUHIRO, MATSUSHITA, YASUO, Fujitani, Mitsuhiro, Sumitomo Wiring Systems, Ltd., Matsushita, Yasuo, Sumitomo Wiring Systems, Ltd.
Applicants: SUMITOMO WIRING SYSTEMS, SUMITOMO WIRING SYSTEMS, LTD.
Application year: 1997
Main classification: H01R13
IPC codes: H01R13