Abstract: A locking system for a movable member supported by a support frame, the support frame having an engagement surface, the locking system comprising a lock member and an input device adapted to be mounted on the movable member the input device being operably connected to the lock member. The input device is rotatable to move the lock member from a first position to a second position, the second position defining a locked position wherein the lock member is adapted to be in contact with the engagement surface. The locking system also includes a link arm and a spring that permits additional rotation of the input device after the lock member reaches the locked position, if necessary.