Abstract:
A dual-motion mating assisted connector is disclosed. The connector comprises:
   a. a first housing having a top and a bottom surface and connecting ends,   b. a second housing having a top and bottom surface and connecting ends,   c. a lever having one cam arm or a bridge linking to two cam arms at the end thereof.
 
The lever is rotated to provide dual motions of the first housing and second housing simultaneously.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to electrical connector and in particular, to electrical connector with dual-motion mating assisted lever. 
         [0003]    2. Background Discussion 
         [0004]    In many occasions, electronic components require mate assist assembly to connect several electrical contacts. Conventionally, mate assist assembly includes a lever having a handle and two lever arms that extend from, and are rotated alongside, side walls of the first connector housing. The second connector housing is slid onto and encloses the first connector housing to a point where electrical contact are ensured. 
         [0005]    U.S. Pat. No. 6,558,176 issued to Tyco Electronics Corp discloses an electrical connector comprising: first and second housings having ends configured to receive electrical contacts, said first and second housings having front ends configured to be matable with one another to join corresponding electrical contacts, said first and second housings being movable between initial and final positions, at which corresponding connector partially and fully mate, respectively; a lever member engaging said first and second housings and moving said first and second housings between said initial and final positions as said lever member is rotated through a range of motion about a rotational axis, said lever member including at least one cam arm having a retention aperture to engage said first housing and having first and second gear surfaces configured to engage said second housing; and first and second mating posts mounted within an interior region of said second housing, said first mating post engaging said first gear surface at a first distance from said rotational axis as said lever member is rotating through said range of motion to move said first and second housings toward said final position, said second mating post engaging said second gear surface at a second distance from said rotational axis as said lever is rotating an opposite direction through said range of motion to move said first and second housings toward said initial position, said first and second distances being different. 
         [0006]    U.S. Pat. No. 6,644,991 issued to Tyco Electronic Corp. discloses an electrical connector, comprising: first and second housings having rear ends configured to receive electrical contacts, said first and second housings having front ends configured to be matable with one another to join corresponding contacts, said first and second housings being movable between initial and final positions, at which corresponding electrical contacts partially and fully mate, respectively; a lever member engaging said first and second housings and moving said first and second housings between said initial and final positions as said lever member is rotated through a range of motion, said lever member including a cam arm having a first retention element provided on at least one side of said cam arm to engage said first housing and a second retention element provided on a peripheral surface of said cam arm to engage said second housing; and a lever retention block provided within an interior region of said first housing and having a pivot chamber that retains said first retention element while permitting rotation of said first retention element within said pivot chamber as said lever member rotates through said range of motion. 
         [0007]    U.S. Pat. No. 8,297,993 issued to FCI Automotive Holding discloses a connector arrangement, comprising: a first connector housing and a complementary second connector housing; a mate assist device, comprising at least one actuating arm movably mountable to the first connector housing, wherein the actuating arm comprises at least one cam slot and the second connector housing comprises at least one corresponding cam nose to engage the cam slot, such that upon actuating of the mate assist device the cam slot can draw the cam nose towards the first connector housing to move the second connector housing towards the first connector housing; wherein the actuating arm is provided with at least one blocking wing, which forms part of the at least one cam slot and which wing is arranged movable with respect to the actuating arm and prevents an actuating of the mate assist device, when the second connector housing is not at least partially mated with the first connector housing, characterized in that the blocking wing has a reduced thickness in comparison with the actuating arm or in that at least one portion of the blocking wing is provided with a reduced thickness in comparison with the actuating arm to facilitate a bending of the blocking wing with respect to the actuating arm. 
         [0008]    U.S. Pat. No. 7,465,185 issued to FCI America Technology Inc. discloses an electrical connector adapted to mate with a mating connector is provided. The electrical connector includes a housing; a wire dress cover pivotally connected to the housing; and a slide latch pivotally connected to the wire dress cover and slid ably connected to the housing. The slide latch has a front end with a hole for snap lock connecting to a lock ramp on the mating connector. The housing includes at least one ramp for moving the front end of the slide latch relative to the lock ramp in response to the slide latch being slid relative to the housing. 
         [0009]    U.S. Pat. No. 6,099,330 issued to Gundermann discloses a mate assist assembly that includes a lever, and first and second connector housings. Each connector housing includes electrical contacts, and the first connector housing is configured to be positioned inside the second connector housing. The lever has a handle and two arms. The arms extend from, and may be rotated alongside, end walls of the second connector housing. The arms include lever surfaces that are positioned on the end walls. The second connector housing, with the handle positioned proximate a top end, may be slid over the first connector housing to a point where the electrical contacts resist further insertion. The lever then is rotated downward along a back wall of the second connector housing which causes the lever surfaces to engage cam surfaces located on end walls of the first connector housing. As the lever surfaces engage, and are resisted by, the cam surfaces, the second connector housing is pulled further downward over the first connector housing until the electrical contacts are fully mated. 
         [0010]    U.S. Pat. No. 5,833,484 issued to Post discloses a mate assist assembly which has a similar structure as that of the U.S. Pat. No. 6,099,330. However, the second connector housing and arms of the lever are positioned on the first connector housing. Each arm includes a pinion with gears. The first connector housing includes racks situated on the first connector housing with each rack corresponding to the gear teeth of one of the pinions. As the handle is rotated upward, the racks and pinions engage and pull the second connector housing downward into the first connector housing. 
         [0011]    U.S. Pat. No. 6,638,085 issued to Tyco electronics Corp. discloses an electrical connector including first and second housings having ends configured to receive electrical contacts. The first and second housings are configured to be matable with one another to join corresponding electrical contacts and are movable between initial and final positions. The electrical connector also includes a lever member engaging the first and second housings and moving the first and second housings between the initial and final positions as the lever member is rotated through a range of motion about a rotational axis. The lever member includes a cam arm having a pivot post received by the first housing and first and second notches that engage the first and second housings, respectively. The first housing includes a post slot for rotatably and slidably retaining the pivot post relative to the rotational axis. The first housing further has a first rack engaging the first notch, and the second housing has a second rack engaging the second notch. The first and second racks and notches cooperate to move the first and second housings between the initial and final positions as the lever member is rotated along the range of motion. 
         [0012]    There are several drawbacks in the prior art, for instance, in U.S. Pat. No. 6,638,085. As shown in  FIG. 1 , there is shown a conventional electrical connector  1  including a first housing  2  and a second housing  3  configured to mate with one another to join corresponding electrical contacts when it moves between an initial and a final position. The electrical connector  1  includes a lever  4  what is retained on the exterior wall  5  of the first housing  2 . The lever  4  is rotatable, engaging and moving the first housing  2  and the second housing  3  between the initial and final positions as the lever  4  is rotated about a rotational axis  6 . The lever  4  includes a handle  7  on the lever  4  and a pair of spaced apart cam arms  8 , received by the first housing  2  and the first single notch  9  and a second single notch  10 . 
         [0013]    Each of the cam arms has a pivot post  11  extending inward from interior surface  12  thereof and facing one another. The first housing  2  includes a post slot  13  for rotatably and slidably retaining the pivot post  11  relative to the rotational axis  6 . The first housing  2  further has a first rack  14  engaging the first single notch  9 , and the second housing  2  further has a first rack  14  engaging the first single notch  9 , and the second housing  3  has a second rack  15  engaging the second single notch  10 . The first rack  14 , the second rack  15  and the notches  9 ,  10  cooperate to move the first housing  2  and the second housing  3  between the initial and the final positions as the lever  4  is rotated along the range of motion. 
         [0014]    In view of the disclosure of the conventional art, it was found out that the rotational angle is only limited by a first and a second single notches. The lever of the mate assist assembly is difficult to assemble and unsecured. And the second rack on the second housing, the first notch and second notch of the lever are weak. 
         [0015]    In the prior art, only the first single notch and the second single notch are configured on the lever. The single notch has limited the operating rotational angle  16  during electrical engagement (as shown in  FIG. 1A , the arrow direction numbered  17 ). It is impossible to allow the lever  4  to operate within a large range of rotational angle  16 . In other word, a longer engagement distance  18  for the mating of lever  4  cannot be provided, that requires a longer mating distance  20  as compared to conventional method and where larger mating assisted member cannot be formed due to limited space of the connector. This shows that the prior art design is only suitable for limited terminal wiping length application. 
         [0016]    The single notches  9 ,  10  have also restricted the method of assembling the lever to the first housing  2 . This design does not provide a firm solution to attach the lever  4  to the first housing. There is no extra operating rotational angle  16  available to assist the lever pre-engagement due to its limited operation rotational angle  16 . To avoid the decrement of operating rotational angle  16 , the lever  4  is attached to the first housing  2  by deflecting the cam arms  8  outward away from each other, allowing the pivot posts  11  slide into the post slots  13 , without any rotational pre-engagement. This increases the difficulty of assembly or disassembly as the pair of the pivot posts  11  has to be shifted precisely into the post slots  13  on the exterior wall  5 , at the same time, the first single notch  9  has to be aligned and engaged with the first rack  14 . Besides, there is the possibility of lever shape deformation or breaking the handle  7  if the lever  4  is over deflected. The second housing  3  of the connector includes rectangular side walls  21  having a U-shaped or semi-circular arm catches cut out  22 . Triangular second racks  15  are formed on one side of the arm catches proximate an open face of the second housing  3 . During the operation of the lever, there is high force exertion onto the second rack  15 . The structural strength of the second rack  15  is weak due to the big U-shaped and semi-circular arm catches cut out  22 . The triangular second racks  15  might deform easily inward or outward. Disengagement of the housings will happen when the second racks  15  deformed outward due to insufficient support from the rectangular side walls  21 . In this design, solid design is highly preferred or a protection feature should be added. 
         [0017]    The post slots  13  on the first housing  2  have oppositely aligned retention bumps  23  extending inward towards one another, located between flex holes  24 . This frictional retention approach is too soft to retain the lever  4  at its final position. There is also no other locking method indicated in the design to locate the lever at its initial position due to faulty operation if it is not fully secured. 
         [0018]    The pivot posts  11  and the cam arms  8  are simply mounted on the oval post slots  13  and seated on the exterior wall  5  respectively. The lever acts like a clip by handle  7  to ensure the pivot posts  11  are always seated along the post slots  13 . There is no locking between the cam arms  8  and the exterior wall  5 . The lever  4  might detach from the first housing  2  due to misoperation or unpredictable external force applied on the side of the cam arms  8 . 
         [0019]    It is therefore, an object of the present invention to provide a dual-motion mate assisted connector in view of the shortcomings mentioned above, with simple lever assembly method and a secure lever locking mechanism, wherein high force reduction together with double travelling distance of the mating and un-mating mechanism of the connector is achieved through various type of engagement members of the lever and first and second connectors, configured to mate with one another to join corresponding electrical contacts. 
       SUMMARY OF THE INVENTION 
       [0020]    To accomplish the above-mentioned objective, the dual-motion mating assisted connected comprises: 
         [0021]    a. a first housing having a top and a bottom surface and connecting ends, wherein each of the top and bottom surfaces are provided with a first engaging rack having multiple teeth with recess in between the teeth, and are respectively provided with a post slot as movable pivot seating; 
         [0022]    b. a second housing having a top and bottom surface and connecting ends, wherein the top and bottom surfaces are provided with a second engaging rack having multiple teeth with recess in between the teeth; and 
         [0023]    c. a lever having one cam arm or a bridge linking to two cam arms at the end thereof, and each cam arm having a combined first pinion with multiple teeth and second pinion with multiple teeth, wherein the cam arm is provided with a pivoting post, and the lever assists the mating and un-mating of the first and the second housing of the connector by allowing the pivoting post of the lever to slide within the post slot on the first housing, and the lever is rotated within a range depending on the number of multiple gear teeth engagement from an initial connector mating position to a final connector mating position, and the pinions engage with the teeth of the first engaging rack and the second engaging rack. 
         [0024]    Yet still a further object of the present invention is to provide a dual-motion mating assisted connector comprising: 
         [0025]    a. a first housing having a top and a bottom surface and connecting ends, wherein each of the top and bottom surfaces are provided with a first single engaging boss, and are respectively provided with a post slot as movable pivot seating; 
         [0026]    b. a second housing having a top and bottom surface and connecting ends, wherein the top and bottom surfaces are provided with a second single engaging boss; and 
         [0027]    c. a lever having one cam arm or a bridge linking to two cam arms at the end thereof, and the cam arm having a combined first boss engaging side slot and second boss engaging side slot, wherein the cam arm is provided with a pivoting post and the first single engaging boss on the first housing which is side offset from the post slot and the second single engaging boss on the second housing which is side offset from the post slot after the first housing and the second housing are engaged, and the lever assists the mating and un-mating of the first and the second housing of the connector by allowing the pivoting post of the lever to slide within the post slot on the first housing, and the lever is rotated from an initial connector mating position to a final connector mating position. 
         [0028]    Another object of the present invention is to provide a dual dual-motion mating assisted connector comprising: 
         [0029]    a. a first housing having a top and a bottom surface and connecting ends, wherein each of the top and bottom surfaces are provided with a first single engaging boss, and are respectively provided with a post slot as movable pivot seating; 
         [0030]    b. a second housing having a top and bottom surface and connecting ends, wherein the top and bottom surfaces are provided with a second single engaging boss; and 
         [0031]    c. a lever having one cam arm or a bridge linking to two cam arms at the end thereof, and the cam arm having a combined first boss engaging back slot and second boss engaging front slot, wherein the cam arm is provided with a pivoting post and the first single engaging boss on the first housing which is back offset from the pivoting post and the second single engaging boss on the second housing which is front offset from the post slot after the two housings are engaged, and the lever assists the mating and un-mating of the first and the second housing of the connector by allowing the pivoting post of the lever to slide within the guiding slot on the first housing, and the lever is rotated from an initial connector mating position to a final connector mating position. 
         [0032]    A further object of the present invention is to provide a dual-motion mating assisted connector comprising: 
         [0033]    a. a first housing having a top and a bottom surface and connecting ends, wherein each of the top and bottom surfaces are provided with an engaging boss or rack having multiple teeth with recess in between the teeth, and are respectively provided with a post slot as movable pivot seating; 
         [0034]    b. a second housing having a top and bottom surface and connecting ends, wherein the top and bottom surfaces are provided with an engaging boss or rack having multiple teeth with recess in between the teeth; and 
         [0035]    c. a lever having one cam arm or a bridge linking to two cam arms at the end thereof, and the cam arm having two engaging features selected from the group consisting of a pinion with multiple teeth, a boss engaging side slot and a boss engaging front or back slot, wherein the cam arm is provided with a pivoting post, and the pinions engage with the teeth of the engaging rack or the side slot engages with the single engaging boss on the housing which is side offset from the post slot or the front or back slot engages with the single engaging boss on the housing which is front or back offset from the post slot, and the lever assists the mating and un-mating of the first and the second housing of the connector by allowing the pivoting post of the lever to slide within the guiding slot on the first housing, and the lever is rotated to from an initial connector mating position to a final connector mating position. 
         [0036]    Yet a further object of the present invention is to provide a dual-motion mating assisted connector, wherein the first housing further comprising a flexible outer wall with the post slot and a guiding slot, allowing insertion of the lever into the guiding slot on the first housing, wherein the lever is provided with a pivot post protruding outward from the outer cam surface of the cam arm, which is inserted along the guiding slot and located within the post slot after insertion to prevent disengagement of the lever. 
         [0037]    Another main object of the present invention is to provide a dual-motion mating assisted connector, wherein a first and second multiple teeth pinion are used to mate with the first and the engaging rack to provide a full range of rotational operating angle. The conversion of rotational motion into dual linear motion of the second and first housing mitigates the issues of connectors that require long mating distance. 
         [0038]    Yet a further object of the present invention is to provide a dual-motion mating assisted connector, wherein the anti-mismatching between the pinion and the first tooth of the engaging rack prevents incorrect mating between the first and the second housing. 
         [0039]    It is an object of the present invention to provide a dual-motion mating assisted connector which can securely couple the connector such that the connection is in good contacts even during movement, such as vibration. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0040]    The aforementioned objects and advantages of the present invention, as well as additional objects and advantages thereof, will be more fully understood herein after as a result of a detailed description of a preferred embodiment when taken in conjunction with the following drawings in which: 
           [0041]      FIG. 1  shows an exploded isometric view of the mate assist assembly disclosed in U.S. Pat. No. 6,638,085. 
           [0042]      FIG. 1A  illustrates the engagement of the first housing with the second housing of a conventional connector shown in  FIG. 1 , wherein the lever is at the initial position before the first housing and the second housing is at full engagement. 
           [0043]      FIG. 1B  illustrates the final position of the lever after the first housing and second housing being fully in engagement. 
           [0044]      FIG. 2  illustrates a perspective view of the first housing of a dual-motion mating assisted connector according to an embodiment of the present invention. 
           [0045]      FIG. 3  illustrates a perspective view of the first housing of a dual-motion mating assisted connector according to an embodiment of the present invention, wherein the flexible roof is being removed. 
           [0046]      FIG. 4  is a perspective view of the second housing of a dual-motion mating assisted connector according to an embodiment of the present invention. 
           [0047]      FIG. 5  is a perspective view of the lever of the connector in accordance with the present invention. 
           [0048]      FIG. 6  is a schematic view showing the first multiple teeth pinion and the second multiple teeth pinion of the lever and the gear teeth conjoined by the lever arm wings and the enlarged teeth on the pinion in accordance with the present invention. 
           [0049]      FIG. 7  is a schematic view showing the engagement of the first tooth of the first rack with rounded or chamfered edge with the multiple teeth pinion of the present invention. 
           [0050]      FIG. 8  is a perspective view of the lever locking member in accordance with the present invention. 
           [0051]      FIG. 9  is cross-section view showing the locking of the lever at the lever-locking member in accordance with the present invention, wherein the lever is at pre-lock position. 
           [0052]      FIG. 10  is a cross-section view showing the lever at final lock position and the bridge of the lever being locked on the lever locking member in accordance with the present invention. 
           [0053]      FIG. 11  is perspective views showing the mounting of the lever, wherein the lever is to be fitted and secured onto the first housing in accordance with the present invention. 
           [0054]      FIG. 12  is a schematic view showing the insertion of the polarized pivot post within the pivot slot on the flexible roof in accordance with the present invention. 
           [0055]      FIG. 13  is a perspective view showing the mounting between the first housing and the second housing together with the operation of the lever in accordance with the present invention. 
           [0056]      FIG. 14  is a perspective view showing the lever locking member and the lever in accordance with the present invention. 
           [0057]      FIG. 15  shows another preferred embodiment of a cam profile for a dual-motion lever, which has a simple cam profile, in accordance with the present invention. 
           [0058]      FIG. 16  is a perspective view showing the lever at final lock position and the bridge of the lever being locked on the lever locking member in accordance with the present invention. 
           [0059]      FIG. 17  shows another preferred embodiment of the dual-motion lever cam profile in accordance with the present invention. 
           [0060]      FIG. 18  is a perspective view showing the lever with another type of cam profile at final lock position and the bridge of the lever being locked on the lever locking member in accordance with the present invention. 
           [0061]      FIG. 19  is a perspective view of another preferred embodiment of the dual-motion lever cam profile in accordance with the present invention. 
           [0062]      FIG. 20  is a perspective view showing the lever with another type of cam profile at final lock position and the bridge of the lever being locked on the lever locking member in accordance with the present invention. 
           [0063]      FIG. 21  is a perspective view of another preferred embodiment of the dual-motion lever cam profile in accordance with the present invention. 
           [0064]      FIG. 22  is a perspective view showing the lever with another type of cam profile at final lock position and the bridge of the lever being locked on the lever locking member in accordance with the present invention. 
           [0065]      FIG. 23  is a perspective view of another preferred embodiment of the dual-motion lever cam profile in accordance with the present invention. 
           [0066]      FIG. 24  is a perspective view showing the lever with another type of cam profile at final lock position and the bridge of the lever being locked on the lever locking member in accordance with the present invention. 
           [0067]      FIG. 25  is a perspective view of another preferred embodiment of the dual-motion lever cam profile in accordance with the present invention. 
           [0068]      FIG. 26  is a perspective view of the first housing in accordance with another preferred embodiment of the present invention. 
           [0069]      FIG. 27  is a perspective view showing the mating of the first housing, and the second housing with the lever being at a locking position, in accordance with the present invention. 
           [0070]      FIG. 28  is a perspective view of the first housing in accordance with another preferred embodiment of the present invention. 
           [0071]      FIG. 29  is a perspective view showing the mating of the first housing, and the second housing with the lever being at a locking position, in accordance with the present invention. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0072]    Referring to  FIGS. 2-5 , the present invention generally relates to an electrical connector assembly  100  that includes a first housing  300  as shown in  FIG. 2 , a second housing  400 , as shown in  FIG. 4 , and a lever  500 , shown in  FIG. 5 , used for securely mating the two housings  300 ,  400  of the connector  100  together. In general the connector assembly  100  comprises a first housing  300  and a second housing  400  for positively connection of electrical contacts. A level  500  is used to secure the coupling of the two housings  300 ,  400  by providing a dual motion movement from a pre-lock position of the lever  500  to a full-lock position of the lever  500 . As shown in  FIG. 2 , the first housing  300  is matable together with the second housing  400  shown in  FIG. 4 . The connection of cables and/or the like for the connector  100  is well known in the art and further disclosure is omitted. The first housing  300  has a top and a bottom surface, and connecting ends, wherein each of the top and bottom surfaces are provided with a first engaging rack  40  having multiple teeth with recess in between the teeth, and are respectively provided with a post slot as movable pivot seating. As shown in  FIG. 4 , the second housing  400  is provided with a top and bottom surface and connecting ends, wherein the top and bottom surfaces are provided with a second engaging rack  60  having multiple teeth with recess in between the teeth. The lever  500  ( FIG. 5 ) is provided with one cam arm or a bridge  80  linking to two cam arms  90  at the end thereof, and each cam arm  90  is a combined first pinion  111  with multiple teeth and second pinion  112  with multiple teeth, wherein the cam arm  90  is provided with a pivoting post  120 , and the lever  500  assists the mating and un-mating of the first  300  and the second housing  400  of the connector  100  by allowing the pivoting post  120  of the lever  500  to slide within the post slot  301  on the first housing  300 , and the lever  500  is rotated within a range depending on the number of multiple gear teeth engagement from an initial connector mating position to a final connector mating position, and the pinions engage with the teeth of the first engaging rack  40  and the second engaging rack  60 . 
         [0073]    As seen in  FIG. 2 , there is shown a perspective view of the first housing  300  in accordance with the present invention. The first housing  300  is substantially rectangular box-like shaped having two ends for connection with the second housing  400  at one end and with wires or cables on the opposite end thereof. The ends of the first housing  300  are provided with a plurality of contacting slots for connecting of contacts of wires on the second housing  400 . In a preferred embodiment, on the longer outer surface of the first housing  300 , there is provided a flexible roof  20  having a pivoting slot  171  thereon. The direction of the pivoting slot  171  is elongated and the axis of the slot  171  is in the direction of the mating direction of the first housing  300 . In another preferred embodiment, as shown in  FIG. 26 , there is shown a first housing  300  without the flexible roof  20  in accordance with the present invention. 
         [0074]    In accordance with the present invention and referring to  FIG. 3 , there is shown a first rack  40  formed on the surface of the first housing  300 , having a first tooth  50  and a second tooth  200 . In between the first tooth  50  and the second tooth  200 , a notch  41  is formed.  FIG. 3  shows perspective views of the first housing of a dual-motion mating assisted connector according to an embodiment of the present invention. As shown in  FIG. 3 , the flexible roof  20  is being removed so as to illustrate the first rack  50  on the first housing  300 . 
         [0075]    The lever  500  ( FIG. 5 ) assists the mating and un-mating of the first  300  and second housing  400  of the connector  100  by allowing the pivoting post  120  of the lever  500  to slide within the post slot  171  on the first housing  300 , wherein the lever  500  is rotated to a pre-lock position before mating with the first  300  or second housing  400 . This will be explained with reference to  FIG. 5 . 
         [0076]      FIG. 4  illustrates a perspective view of the second housing  400  of a dual-motion mating assisted connector  100  according to an embodiment of the present invention. The second housing  400  is a receptacle to receive the first housing  300 . On the surface of the second housing  400 , an engaging member or a second rack  60  is provided at a position for the engagement with the pinion of the lever  500  (as shown in  FIG. 13 ). Similar to the first rack  40  on the first housing  300 , the second rack  60  includes a first tooth  70  and a second tooth  210 , and a notch  75  is formed between the first tooth  70  and the second tooth  21 . 
         [0077]    The second engaging rack  60  of the second housing  400  is shown in  FIG. 4  in accordance with the present invention. 
         [0078]    As shown in  FIG. 5 , there is shown a perspective view of the lever  500  of the connector  100  in accordance with the present invention. By way of example the lever  500  is substantially a U-shaped structure having a bridge  80  extended to form two cam arms  90  at the end thereof, and the two cam arms  90  is provided with a first multiple teeth pinion  111  and a second multiple teeth pinion  112 . In accordance with the preferred embodiment of the present invention, the first and the second multiple pinion  111 ,  112  are provided with a pivoting post  120  at the outer face of the cam arms  90 . The pinions  111 ,  112  are provided with a plurality of engaging teeth or gear. The pivoting post  120  is positioned within the pivoting slot  171  located on the first housing  300 . 
         [0079]      FIG. 6  is a schematic view showing the first multiple teeth pinion  111  and the second multiple teeth pinion  112  in accordance with the present invention. As shown, the first tooth  140  on the first multiple teeth pinion  111  is a very short protrusion so as to allow the insertion of the lever  500  into the space between the first rack  40  of the first housing  300  and the engaging rack  60  of the second housing  400 . 
         [0080]    In a preferred embodiment, as shown in  FIG. 6 , there is shown a perspective view of the gear conjoined by the lever arm wing  270  and the enlarged teeth  280  on the pinion in accordance with the present invention. In the present preferred embodiment, a customized gear  220  is used and is conjoined by a lever arm wing  270  and enlarged teeth  280  on the multiple teeth pinion that engages the first  40  and second or the engaging rack  60  at the highest exerted force. In other words, it is positioned at the first tooth  140  of the first multiple teeth pinion  111  and the third tooth  190  of the second multiple teeth pinion  112 . 
         [0081]      FIG. 7  is a schematic section view showing the engagement of the first rack  40  with the multiple teeth pinion  111  of the present invention.  FIG. 8  is a perspective view of the lever locking housing  900  in accordance with the present invention, wherein final lock element  230  is formed on the housing  900  for the securing of the lever  500 . In the course of pre-locking, the prelocking opening  250  on the lever (shown in  FIG. 5 .) engages with a pre-lock element  240  and in full lock of the lever  500 , the lever bridge  80  of the lever  500  will lock onto the final lock element  230  on the lever locking housing  900 . 
         [0082]    Referring to  FIG. 8 , there is shown a perspective view of the lever-locking member  900  in accordance with the present invention. As shown, the final lock element  230  is provided on the lever-locking member  900  and a pre-lock element  240  is positioned at the lateral side of the member  900 . 
         [0083]      FIGS. 9 and 10  are cross-section views showing the locking of the lever  500  at the lever-locking member  900  in accordance with the present invention. As shown in  FIG. 9 , the lever  500  is at the pre-lock position, and at this instant, the pre-lock element  240  is positioned within the pre-locking opening on the lever  500 . 
         [0084]    When the lever  500  moves to the final locking position, the first housing  300  moves downwards in the direction indicated by arrow  910 , as shown in  FIG. 9 . Referring to  FIG. 10 , the lever  500  is being positioned at the final lock position. 
         [0085]      FIG. 11  is a perspective view showing the mounting of the lever  500  onto the first housing  300  in accordance with the present invention. In accordance with the present invention, the lever  500  is inserted in the direction of arrow  520  as shown in  FIG. 11 , into the first housing  300  by engaging the pivot post  120  into the flexible roof  20  through an insertion guiding path  290  (shown on  FIG. 2 ). The post polarizer  130  of the pivot post  120  guides the insertion for the lever pivot post  120  into the post slot  171  of the first housing  300 . The flexible roof  20  deforms a little and the pivot post  120  enters into the post slot  171 , and is locked by a stopper (not shown) with the engagement of the first tooth  50  of the first rack  40  to the first tooth  140  of the first multiple teeth pinion  111 . 
         [0086]      FIG. 12  is a schematic view showing the insertion of the pivot post  120  within the pivot slot  171  in accordance with the present invention. As shown in  FIG. 7 , the cam arm  90  has a pivot post  120  and a polarizing member  130  which is used to guide or for the correct direction of inserting the lever  500  into the pivot slot  171 . The third tooth  190  of the second multiple teeth pinion  112  is provided with a protrusion  260  to prevent to prevent the mismatching of the lever  500  with the teeth of the second rack  60 . The protrusion  260  will hit and stop at the engaging rack  60  if the lever  500  is released from its pre-lock position before the first housing  300  is inserted into the second housing  400 . This will allow the second multiple teeth pinion  112  of the lever  500  to correctly engage with the second rack  60  without mismatching. 
         [0087]      FIG. 13  is a perspective view of a lever locking member  900  which has a pre-lock element  240  and a final lock element  230  on the member  900 , together with the lever  500 . 
         [0088]      FIG. 14  is a perspective view showing the mounting between the first housing  300  and the second housing  400  together with the operation of the lever  500  in accordance with the present invention. The first housing  300  with the lever  500  is positioned into the second housing  400  and the lever  500  is positioned at the final lock element of the locking member  900 . In accordance with the present invention, other forms of cam profile-dual-motion lever can be used in the present invention, for instance, the cam profile of the cam can be simplified into simple cam profile lever or a mixed pinion and cam profile dual-motion lever. 
         [0089]    These examples are shown in  FIGS. 15, 17, 19, 21, 23, and 25 , and the respective perspective views of the connector  100  with the various combination of cam profile dual-motion lever are shown in  FIGS. 16, 18, 20, 22, 24, and 27 . 
         [0090]      FIG. 15  is a perspective view of the lever having a simple boss with side offset in accordance with the present invention.  FIG. 16  is a perspective view showing the engagement of the lever  500  having the simple boss cam profile with the post on the first housing  300 . 
         [0091]      FIG. 17  shows another preferred embodiment of the dual-motion lever cam profile in accordance with the present invention. The cam profile is a front and back offset, and  FIG. 18  is a perspective view showing the lever  500  being engaged with the post on the first housing.  FIGS. 19, 21, 23, and 25  are perspective views showing another preferred embodiment of the dual-motion lever cam profile in accordance with the present invention, and  FIGS. 20, 22, 24, and 27  are perspective view showing the engagement of the lever having the different cam profiles shown in  FIGS. 19, 21, 21 and 25 , in accordance with the present invention. 
         [0092]    In another preferred embodiment, a flexible roof is not in use, the first housing  300  is provided with two vertical slots,  245 ,  255 , wherein the first sliding slot  245  is functioned as a sliding slot for the pivot post  120  on the cam arms  90  of the lever  500 , and the other slot,  255  is functioned as an opening for the engaging rack  60  of the second housing  400  to pass through so as allow the movement of the engaging rack  60  when the first  300  and the second housing  400  are mated. This can be seen from  FIGS. 26-29 , wherein  FIG. 26  is a perspective view of the first housing  300  in accordance with another preferred embodiment of the present invention. In this case, the flexible roof is not available, and the first sliding slot  245  is formed on the surface of the first housing  300  for the insertion of the pivot post  120 .  FIG. 27  is a perspective view showing the mating of the first housing  300 , and the second housing  400  with the lever  500  being at a pre-lock position.  FIG. 28  is a perspective view of the first housing  300  in accordance with another preferred embodiment in accordance with the present invention.  FIG. 29  is a perspective view showing the lever  500  is being positioned at the full lock position where the bridge  80  of the lever  500  is locked by the locking element  230  on the lever locking member  900 . When the lever  500  is at the full locking position on the lever locking member  900 , the first housing  300  and the second housing  400  are fully engaged, as shown in  FIGS. 14, 16, 18, 20, 22, 24, 27, and 29 . 
         [0093]    In accordance with the present invention, the dual-motion mating assisted connector  100  comprises a first housing  300 , a second housing  400  and a lever having one cam arm or a bridge  80  linking to two cam arms at the end thereof, and the cam arm having two engaging features selected from the group consisting of a pinion with multiple teeth, a boss engaging side slot and a boss engaging front or back slot. The cam arm is provided with a pivoting post, and the pinions engage with the teeth of the engaging rack or the side slot engages with the single engaging boss on the housing which is side offset from the post slot or the front or back slot engages with the single engaging boss on the housing which is front or back offset from the post slot, and the lever assists the mating and un-mating of the first and the second housing of the connector by allowing the pivoting post of the lever to slide within the guiding slot on the first housing, and the lever is rotated to from an initial connector mating position to a final connector mating position. 
         [0094]    While a particular embodiment has been chosen to illustrate the invention, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the scope of the invention as defined in the appended claims. For example, although the first and second housing are shown as box-like rectangular shape with contacts, and that the teeth of the pinion can be varied to mate the first and the engaging racks on the housing, and that the shape and position of pivot. It will now be apparent that the illustrated examples may be readily modified without deviating from the inventive concepts presented herein. By way of example, the precise shape, dimensions and layout of the connectors and connector pins may be altered while still achieving the function and performance of a wearable smart electrical connector. Accordingly, the scope hereof is to be limited only by the appended claims and their equivalents.