LOCK MECHANISM OF DOOR OF APPARATUS CASE

PROBLEM TO BE SOLVED: To provide a lock mechanism of a door of an apparatus case simple in mechanism and capable of immediately locking by closing a door and turning a knobwithout caring about the position of the knob, and lessening looseness to realize long-term stability. SOLUTION: This locking mechanism is formed by a male screw structure part 1 provided on the door D side and having a male screw 2, the tip of which is tapered and which can be rotated with the door knob 3, and a female screw structure part 10 provided on the case C side and having a movable shaft 11 provided with a tapered inlet hole and a female screw 11a engaged with the male screw 2. The movable shaft 11 of the female screw structure part 10 is movable within a range of inserting the tip of the male screw 2 in the female screw 11a in a plane vertical to the axial direction when the door d is closed.