Catch device for locking aircraft landing gear in the raised position

A catch device for locking an aircraft landing gear in the high position, the device comprising a main casing receiving a hook hinged about a first axis and a locking lever hinged about a second axis parallel to said first axis, a first branch of the lever carrying a thrust wheel that co-operates with a camming surface of the hook, and a second branch of the lever being connected via a linkage to an outlet shaft of a driving motor and gear box assembly, wherein the linkage includes an oblong slot at one of its hinged axes in order to make it possible for the locking lever to pivot in the direction for unlocking the hinged hook in the event of the outlet shaft of the motor and gear box assembly jamming, and wherein said catch device further includes an independent trigger associated with the locking lever, suitable for being triggered in an emergency to pivot said locking lever sufficiently to release the thrust wheel from the associated camming surface and to unlock the hinged hook.