US Patent 7318739 Connector

A lock projection (12) is formed on a wall portion (6) of one connector (2), and a lock receiving portion (30) for the lock projection (12) is provided at an elastic wall portion (20) of the other connector (3). The connectors (2, 3) are locked together by engaging the lock projection (12) with the lock receiving portion (30). Cancellation convex portions (25) are formed on an inner surface of the elastic wall portion (20) of the other connector (3), and the locking of the connectors (2, 3) is canceled according to the principle of leverage in which the cancellation convex portions (25) serve as fulcrums. An operating flange (22) is formed on and extends from a fitting front end of the wall portion (20) of a hood portion (19). The cancellation convex portions (25) are disposed between the lock receiving portion 30 and the operating flange (22).