Patent ID: 7252530

Claim:
An electrical connector assembly comprising: a first housing having a locking projection formed thereon; a second housing connectable with the first housing, a resiliently deflectable lock arm formed on the second housing, a locking hole formed in the lock arm and a front wall formed on the lock arm forward of the locking hole, the locking hole being engageable with the locking projection on the first housing to hold the housings in a properly connected state, the lock arm being inclined relative to the second housing at an intermediate stage of a connecting operation of the two housings; and a detector slidably mounted on the lock arm and being movable between a standby position and a detecting position, a resilient locking piece provided on the detector and projecting substantially towards the first housing and at least partly across the locking hole, the resilient locking piece engaging the front wall of the lock arm for restricting movement of the detector from the standby position to the detecting position when the housings are not properly connected, the lock projection being engageable in the locking hole and pushing the resilient locking piece away the front the wall of the locking hole when the lock arm moves over the lock projection and is restored during the connecting operation for permitting movement of the detector to the detecting position when the housings are connected property, thereby detecting a connected state of the two housings, and bulges bulging out from lateral edges of the resilient locking piece for contacting portions of the lock arm adjacent the lock hole and preventing the resilient locking piece from being resiliently deformed into the lock hole as the detector is moved.