EP1614196B1

EP1614196B1 - Lever type electrical connector assembly with improved locking means

Info

Publication number: EP1614196B1
Application number: EP04758992A
Authority: EP
Inventors: Byung-Chan Yoon
Original assignee: Molex LLC
Current assignee: Molex LLC
Priority date: 2003-04-02
Filing date: 2004-03-26
Publication date: 2007-05-23
Anticipated expiration: 2024-03-26
Also published as: DE602004006617T2; JP2006522449A; JP4191763B2; EP1614196A1; DE602004006617D1; WO2004093258A1

Description

Field of the Invention:

This invention generally relates to the art of electrical connectors and, particularly, to a connector assembly which includes a pair of mating connectors.

Background of the Invention:

Generally, an electrical connector assembly typically includes a first electrical connector mateable with a second electrical connector. For instance, a receptacle connector may receive a plug connector in mated condition. Each connector includes some form of dielectric housing which mounts a plurality of conductive terminals engageable with the terminals of the other connector. For instance, one connector may mount a plurality of socket terminals for receiving pin terminals of the other connector.
In some applications, such electrical connectors mount a rather sizable number of terminals. For instance, in electrically connecting electrical equipment of automobiles or other vehicles, a large number of electrical wires, circuits or other conductive devices lead to and from a large number of fuses, relays, electrical motors, power accessories, and the like, all of which may be mounted in a single electrical connector which, itself, may even include both power terminals and signal terminals. Electrical connectors with such large number of terminals create various problems.
For instance, it is extremely important that the two connectors of the connector assembly be precisely aligned in order to assure that the large number of terminals in the two connectors can be interengaged or mated. Cumulative manufacturing tolerances with large number of terminals, alone, can cause alignment problems. Therefore, the two mating connectors cannot be allowed to twist, turn or shift during mating.
In addition, large forces are required to mate and unmate connectors which have a large number of terminals. Consequently, low-insertion-force connectors have been developed which enable mating and unmating with small forces by means of a latching or mating assist lever which operates through some form of cam groove/cam follower arrangement for drawing the two connectors into mated condition. An electrical connector with a mating assist lever is disclosed by the US 5 695 349 A.
Still further, because of external impacts and vibrations imparted on some electrical connectors, such as in automobiles or other vehicles, problems are encountered because the two mating connectors tend to become unmated, and/or the mating terminals of the two connectors tend to become disengaged. Therefore, it is desirable to provide locking means so that these unmatings or disengagements cannot occur.
The present invention is directed to solving these various problems by providing improvements in such electrical connector assemblies and the mating connectors thereof.

Summary of the Invention:

An object of the present invention is to provide a lever type electrical connector assembly with an improved locking means.
In the exemplary embodiment of the invention, a first connector includes a dielectric housing mounting a plurality of first terminals. A mating assist lever is pivotally mounted on the housing of the first connector for pivotal movement between a preliminary mating position and a fully mated position. The lever has a cam groove therein. A second connector includes a dielectric housing mounting a plurality of second terminals for mating with the first terminals of the first connector. A cam follower projection is engageable in the cam groove of the mating assist lever in its preliminary mating position. The connectors are mated in response to rotation of the lever to its fully mated position, as the cam follower projection rides along the cam groove. Locking means are provided between the housing of the second connector and the mating assist lever for locking the mating assist lever in its fully mated position.
According to the invention, the locking means include a separate locking member detachably mounted on the housing of the second connector and engageable with the locking assist lever to lock the lever in its fully mated position. The locking member has a plurality of mounting hooks engageable with locking shoulders on the housing of the second connector. The locking member has at least one locking projection engageable with a locking surface on the mating assist lever.
According to another aspect of the invention, preliminary latch means are provided between the mating assist lever and the housing of the second connector. The preliminary latch means are engageable automatically in response to the lever reaching its fully mated position and before the locking means are engaged.
As disclosed herein, the mating assist lever is generally U-shaped to define a pair of lever arms joined by a cross portion. The lever arms are pivotally mounted to opposite sides of the housing of the first connector. The locking means are provided between the housing of the second connector and the cross portion of the U-shaped mating assist lever.
Other objects, features and advantages of the invention will be apparent from the following detailed description taken in connection with the accompanying drawings.

Brief Description of the Drawings:

The features of this invention which are believed to be novel are set forth with particularity in the appended claims. The invention, together with its objects and the advantages thereof, may be best understood by reference to the following description taken in conjunction with the accompanying drawings, in which like reference numerals identify like elements in the figures and in which:

FIG. 1 is a perspective view of an electrical connector assembly incorporating the concepts of the present invention;
FIG. 2 is a vertical section taken generally along line 2-2 of FIG. 1;
FIG. 3 is an exploded perspective view of the connector assembly;
FIG. 4 is a perspective view looking at the mating face of the receptacle connector of the assembly;
FIG. 5 is a side elevational view of the receptacle connector, schematically illustrating the pivotal movement of the latching lever;
FIG. 6 is a perspective view of the locking member detachably mountable on the plug connector;
FIG. 7 is a perspective view of the plug connector;
FIG. 7A is an enlarged depiction of the area encircled at "A" in FIG. 7; and
FIG. 8 is a perspective view of the plug connector of FIGS. 7 and 7A, with the locking member of FIG. 6 mounted thereon.

Detailed Description of the Preferred Embodiment:

Referring to the drawings in greater detail, and first to FIGS. 1-3, the invention is embodied in an electrical connector assembly, generally designated 10, which includes a receptacle connector, generally designated 12, having a latching lever, generally designated 14, pivotally mounted thereon and a plug connector, generally designated 16, having a locking member detachably mounted thereon. Receptacle connector 12 mounts a plurality of conductive pin terminals 20, and plug connector 16 mounts a plurality of socket terminals 22. Pin terminals 20 are mounted in a plurality of terminal-receiving passages 24 (Fig. 2), and socket terminals 22 are mounted in a plurality of terminal-receiving passages 26 (Fig. 2). When the connectors are mated as shown in FIG. 2, socket terminals 26 of plug connector 16 receive pin terminals 20 of receptacle connector 12. The pin and socket terminals may be terminated to a plurality of discrete electrical wires (not shown).
Connector assembly 10 may be used in such applications as automobiles or other vehicles where impacts and vibrations are encountered. Pin and socket terminals 20 and 22, respectively, may be 3V, 5V and 12V terminals, for instance.
Referring to FIG. 3, receptacle member 12 includes a terminal fixing member, generally designated 28, having a plurality of through passages 28a. Plug connector 15 also includes a terminal fixing member, generally designated 30, having a plurality of through passages 30a. Referring to FIG. 2, terminal fixing members 28 and 30 are positioned into internal slots 28b and 30b, respectively, in receptacle connector 12 and plug connector 16, respectively. The terminal fixing members are movable from preliminary, terminal-loading positions to allow terminals 20 and 22 to be inserted into their respective terminal-receiving passages 24 and 26. In the preliminary positions of the terminal fixing members, through passages 28a and 30a are aligned with terminal-receiving passages 20 and 22, respectively, so that the terminals can be fully inserted into their respective passages. Once all of the terminals are fully inserted into their passages, terminal fixing members 28 and 30 are pushed in the direction of arrows "B" to the terminal fixing positions shown in FIG. 2, whereat the terminal fixing members engage shoulders on the terminals to prevent the terminals from being pulled out of their passages.
Referring to FIG. 4 in conjunction with FIG. 3, receptacle connector 12 includes a dielectric housing, generally designated 32, which has a rear body portion 34 and a front mating portion 36. The housing may be a one-piece structure unitarily molded of plastic material. The rear body portion is formed with the terminal-receiving passages 24 within which pin terminals 20 are mounted. Front mating portion 36 defines a receptacle 40 for matingly receiving plug connector 16. Receptacle 40 defined by front mating portion 36 is shaped to conform to the outer profile of plug connector 16 and includes a mating face 40a.
Generally, complementary interengaging guide means are provided between front mating portion 36 of housing 32 of receptacle connector 12 and plug connector 16 for guiding the connectors into mated condition. To that end, a pair of laterally spaced first guide ribs 42 project downwardly into receptacle 40 from a top of the front mating portion 36 of housing 32 of receptacle connector 12. A pair of laterally spaced, second guide ribs 44 project upwardly into receptacle 40 from a bottom of the front mating portion. A third, enlarged guide rib 46 projects downwardly into receptacle 40 from a top of the front mating portion between the first pair of guide ribs 42. The guide ribs extend through the receptacle in the mating direction to rear body portion 34. Still further, a guide slot 48 extends in the mating direction in each of a pair of side walls 50 of front mating portion 36. As seen best in FIG. 3, a pivot post 52 projects outwardly from each side wall, and each pivot post has a downwardly protruding hook 52a at the distal end thereof. Finally, housing 32 of receptacle connector 12 includes a pair of recesses 54 between first guide ribs 42 and third guide rib 46, for purposes described hereinafter.
Latching lever 14 is a mating assist lever and is generally U-shaped to define a pair of latch or lever arms 56 joined by a bight or cross portion 58. A hooked latch projects inwardly from cross portion 58, and a pair of outwardly opening locking grooves 58b are formed in the outside surface of cross portion 58 to form locking shoulders. A pivot hole 60 is formed in each latch or lever arm 56 for receiving a respective latch post 52 projecting outwardly from housing 32. The hole has a radially extending cut-out portion 60a for receiving hook 52a of pivot post 52. Therefore, latching lever 14 can be mounted to housing 32 only by aligning hooks 52a of pivot post 52 with the cut-out areas 60a of pivot holes 60. Once mounted, slight pivotal movement of the latching lever disaligns hook 52a from cut-out 60a, and the latch arms thereafter cannot be disconnected from the housing. Finally, an arcuate cam slot 62 is formed in each lever arm 56 of latching lever 14. The cam slot has an open mouth 62a. A detent projection 64 is formed at a given location in cam slot 62, for purposes described hereinafter. FIG. 5 shows that latching lever 14 is pivotable in the direction of double-headed arrow "C" about pivot posts 52 from a preliminary mating position shown by full lines and a latched or fully mated position shown in phantom, as will be described in greater detail hereinafter.
Referring to FIGS. 7 and 8 in conjunction with FIG. 3, plug connector 16 includes a dielectric housing, generally designated 66, which may be a one-piece structure molded of plastic material. The housing includes the terminal-receiving passages 26 which receive socket terminals 22 (Fig. 3). A pair of first guide grooves 70 in a top portion of the housing receive the first guide ribs 42 of the receptacle connector. A pair of second guide grooves 72 in a bottom portion of housing 66 receive the second guide ribs 44 of the receptacle connector. An enlarged third guide groove 74 receives the third guide rib 36 of the receptacle connector. A cam follower projection or latch post 76 projects outwardly from each opposite side of housing 66. Each latch post has a shank portion 76a and an enlarged head 76b. A locating detent notch 76c is formed in the latch post and faces in the mating direction of the connector. An elongated guide rib 78 extends rearwardly from latch post 76 in the mating direction.
Referring to FIGS. 7 and 7A, a pair of locking member locating walls 80 project upwardly from housing 66 of plug connector 16 for receiving or locating locking member 18 (Fig. 6) in a position shown in FIG. 8. A locking member coupling structure, generally designated 82, is disposed between locating walls 80. The coupling structure includes a locking hole 84 having chamfered first locking shoulders 84a at opposite sides thereof. Another side of the hole defines a latching shoulder 84b. Second locking shoulders 86 are formed near the bottom of locating walls 80.
Referring specifically to FIG. 6, locking member 18 includes a body 90 which may be a one-piece structure molded of plastic material. The body includes a pair of locking projections 92 which extend forwardly in the mating direction. A pair of first mounting hooks 94 project downwardly from the body, and a pair of second mounting hooks 96 also project downwardly from the body but outside first mounting hooks 94. A pair of coupling grooves 98 are formed on the underside of body 90, one groove 98 being disposed outside each first mounting hook 94 and inside the respective second mounting hook 96.
Locking member 18 is mounted to the top of plug connector 16 in the direction of arrow "D" in FIG. 8. When mounted, first mounting hooks 94 on the underside of the locking member snap into latching engagement with the chamfered first locking shoulders 84a (Fig. 7A) of coupling structure 82. Second mounting hooks 96 snap into locking engagement with second locking shoulders 84. Grooves 98 on the underside of the locking member receive coupling projections 100 which project upwardly from coupling structure 82.
The mating of receptacle connector 12 and plug connector 16 and the locking of the connectors in mated condition now will be described. The plug connector is inserted into receptacle 40 of the receptacle connector, as the cam follower projections or latch posts 76 on the outsides of the plug connector are inserted into guide slots 48 in side walls 50 of the receptacle connector. Precise guiding of the plug connector into the receptacle connector is effected as follows: (1) first guide ribs 42 of the receptacle connector move into first guide grooves 70 of the plug connector, (2) second guide ribs 44 of the receptacle connector move into second guide grooves 72 of the plug connector, (3) third guide rib 46 of the receptacle connector moves into third guide groove 74 of the plug connector and (4) elongated guide ribs 78 which trial behind latch post 76 on the plug connector ride into guide slots 48 of the receptacle connector. The elongated guide ribs 78 prevent the two connectors from relative movement in a vertical direction and prevent relative pivoting movement about horizontal axes generally perpendicular to the mating direction. This entire guide means system ensures that the connectors are aligned precisely and, in turn, precisely aligns socket terminals 22 of the plug connector with pin terminals 20 of the receptacle connector.
Further movement of the two connectors in the mating direction causes cam follower projections 76 to enter mouths 62a of cam slots 62 and into the cam slots. Detent projections 64 in the cam slot must be located to enter the locating detent notches 76b in the leading side of latch posts 76 to properly angularly position latching lever 14. This position is shown by full lines of the latching lever in FIG. 5. The latching lever then is pivoted about pivot posts 52 in the direction of arrow "E" (Fig. 5) which pulls the two connectors into final latching position as latch posts 76 of the plug connector ride along cam slots 62 of the rotating latching lever. When the connectors are fully mated, hooked latch 58a (Fig. 4) snaps into latching engagement with latching shoulder 84b (Figs. 7 and 8) of the plug connector to preliminarily latch the latching lever in the mated condition of the connectors.
Separate locking member 18 then is used to completely lock the latching lever in its mated position. This is accomplished by mounting the locking member onto the plug connector in the direction of arrow "D" in FIG. 8, and as described above. When the locking member is so mounted, locking projections 92 of the locking member are positioned in locking grooves 58b of the latching lever so that the latching lever cannot move back out of its final position of mating of the connectors.
Therefore, hooked latch 58a and latching shoulder 84b form a preliminary latch means for mating assist lever 14. Locking member 18 forms a final locking means for the mating assist lever. The preliminary latch means is engaged automatically when the mating assist lever reaches its fully mated position.

Claims

A lever type electrical connector assembly (10), comprising:
a first connector (12) including a dielectric housing (32) mounting a plurality of first terminals (20);

a mating assist lever (14) pivotally mounted on the housing of the first connector for pivotal movement between a preliminary mating position and a fully mated position, the lever having a cam groove (62) therein;

a second connector (16) mateable with the first connector and including a dielectric housing (66) mounting a plurality of second terminals (22) for mating with the first terminals of the first connector, and a com follower projection (76) engageable in the cam groove (62) of the mating assist lever (14) in its preliminary mating position, whereby the connectors are mated in response to rotation of the mating assist lever (14) to its fully mated position as the cam follower projection (76) rides along the cam groove (62); wherein the mating assist lever (14) comprises a latch hook (58a), which automatically snaps into latching engagement with a latch shoulder (84b) on the housing of the second connector (16) in response to the mating assist lever (14) reaching its fully mated position;
characterized in that the connector assembly comprises a separate final locking member (18) for being detachably mounted on the housing of the second connector (16) once the latch hook (58a) on the mating assist lever (14) is in latching engagement with the latch shoulder (84b) of the second connector (16), wherein
the locking member (18) has at least one locking projection (92) engageable with a locking surface on the mating assist lever (14), thereby positively locking the mating assist lever (14) in its fully mated position, and wherein the locking member (18) has a plurality of mounting hooks (94, 96) engageable with locking shoulders (84a) on the housing of the second connector (16) for mounting the locking member (18) thereon and for retaining the locking projection (92) in engagement with the locking surface (58b) on the mating assist lever (14).
Connector assembly of claim 1, wherein the housing of the second connector (16) comprises a locking hole (84) with chamfered first locking shoulders (84a) at opposite sides thereof, wherein first mounting hooks (94) on the underside of the locking member (18) snap into latching engagement with the chamfered first locking shoulders (84a) when the locking member (18) is mounted on the housing of the second connector (16) thereby still allowing a movement of the locking member (18) in the direction of the locking projection (92) for achieving an engagement with the locking surface (58b) on the mating assist lever (14); and
second mounting hooks (96) for snapping into locking engagement with second locking shoulders (84) on the housing of the second connector (16) once the locking projection (92) of the locking member (18) are in engagement with the locking surface (58b) on the mating assist lever (14).
Connector assembly of claims 1 or 2, wherein the locking member (18) comprises grooves (98) on the underside thereof for receiving coupling projections (100) on the housing of the second connector (16) when the locking member (18) is mounted thereon, wherein the grooves (98) and the coupling projections (100) are oriented such, that guidance of the locking member (18) in the direction of the locking projection (92) is provided.
Connector assembly of claims 1 - 3, wherein the mating assist lever (14) is generally U-shaped to define a part of lever arms joint by a cross portion (58), wherein the latch hook (58a) is arranged in the middle of the cross portion (58).