Electrical connector assembly having locking device

1. An electrical connector assembly comprising:

a first connector having a first housing and a locking lever coupled to the first housing;

a second connector having a second housing and a pair of protuberances at external surfaces of the second housing;

wherein the locking lever is movable relative to the first housing between a first position at which the locking lever allows the second housing to be received by the first housing and a second position at which the locking lever locks the first and second housings together; and

wherein the locking lever has a pair of stoppers engaged to the first housing to lock the locking lever at the first position before the second housing is received by the first housing.

2. The connector assembly of claim 1 , wherein the locking lever has a pair of side plates joint together by a cross bar, each side plate has a guide pivot projecting inwardly facing each other, and wherein when moving relative to the first housing the locking lever rotates about the guide pivot.

3. The connector assembly of claim 2 , wherein the first housing has a pair of guide grooves each receives a protuberance of the second housing and a guide pivot of the locking lever, and wherein when the locking lever moves relative to the first housing the protuberances and the guide pivots slide relative to the guide grooves.

4. The connector assembly of claim 1 , wherein the first housing has a pair of support pivots and the locking lever has a pair of support grooves each receives one of the support pivots.

5. The connector assembly of claim 4 , wherein when the locking lever moves relative to the first housing the support grooves slide relative to the support pivots.

6. The connector assembly of claim 1 , wherein the second housing comprises a pair of bosses each located between the housing and a respective one of the protuberances, wherein when the second housing is received by the first housing the bosses urge against the stoppers to release the stoppers from engagement with the first housing.

7. The connector assembly of claim 6 , wherein each protuberance is generally cylindrical shape having a side portion partially cut away forming a space between the protuberance and an edge of the boss, wherein the space is to allow a corresponding stopper to pass through.

8. The connector assembly of claim 6 , wherein the locking lever comprises a pair of locking grooves and when the second housing is received by the first housing, the pair of protuberances are received by the pair of locking grooves.

9. The connector assembly of claim 8 , wherein when the locking lever moves towards the second position the pair of protuberances are engaged with the pair of locking grooves to prevent the first and second housings from separating from each other.

10. An electrical connector assembly comprising:

a first connector including a first housing and a locking lever, the first housing having a pair of guide grooves, the locking lever having a pair of side plates each having a guide pivot projecting inwardly and facing each other, the locking lever being coupled to the first housing with the pair of guide pivots received in the pair of guide grooves;

a second connector having a second housing and a pair of protuberances at external surfaces of the second housing;

wherein the locking lever is movable relative to the first housing between a first position at which the second housing is received by the first housing and a second position at which the first and second connectors are mated with each other, and

wherein when the locking lever moves relative to the first housing the guide pivots slide relative to the guide grooves.

11. The connector assembly of claim 10 , wherein the locking lever has a pair of locking grooves for engaging the pair of protuberances, and wherein when the locking lever moves to the second position the second housing is brought closer to the first housing by the engagement of the locking grooves and the protuberances.

12. The connector assembly of claim 11 , wherein the first housing has a pair of support pivots and the locking lever has a pair of support grooves each engages one of the support pivots, wherein each guide pivot is located between a corresponding locking groove and a corresponding support groove.

13. The connector assembly of claim 12 , wherein when the locking lever moves to the second position, the support pivots slide along the support grooves and the protuberances slide along the locking grooves simultaneously.

14. The connector assembly of claim 10 , wherein the locking lever has a pair of stoppers engageable with the first housing to lock the locking lever at the first position before the second housing is received by the first housing.

15. The connector assembly of claim 14 , wherein when the second housing is received by the first housing the stoppers are released to allow the locking lever to move to the second position.

16. The connector assembly of claim 15 , wherein the second housing comprises a pair of bosses each located between the second housing and a corresponding protuberance, wherein when the second housing is received by the first housing the bosses urge against the stoppers to release the stoppers from the first housing.

17. The connector assembly of claim 16 , wherein each protuberance is generally cylindrical shape having a side portion partially cut away forming a space between the protuberance and an edge of the boss, wherein the space is to allow a corresponding stopper to pass through.