Patent ID: 8007009

Claim:
A coupling assembly comprising: a female coupling including a receiving portion having internal threads provided therein; and a male coupling comprising: a body having a groove disposed on an outer surface, the body further having a passageway extending therethrough; a locking member disposed in the groove of the body and pivotally movable between locking and releasing positions, the locking member having a leading end, a trailing end, and a retaining formation which engages the internal threads of the female coupling when the locking member is in its locking position; a retaining element which retains the locking member in the groove, the retaining element being disposed between the leading end of the locking member and the retaining formation; a resilient biasing element which biases the locking member toward the releasing position; and a locking sleeve disposed about and axially movable with respect to the body between first and second positions; wherein, after insertion of the male coupling into the female coupling, the locking sleeve is biased towards its first position forcing the locking member to move to its locking position causing the retaining formation of the locking member to engage the internal threads of the female coupling, thereby locking the male coupling and the female coupling together; a first annular seal between an outer surface of the male coupling and an inner surface of a sealing portion of the locking sleeve; and a second annular seal provided on the locking sleeve which sealingly engages at least one surface of the female coupling when the male coupling is connected to the female coupling, wherein the first annular seal has a larger outer diameter than the second annular seal.