LOCKABLE PRESSURE CASING

A housing for an electric or electronic apparatus includes an access hood, or access lid which can be fixed on the housing for closing the housing or a housing opening by a locking mechanism operable from outside the housing. The locking mechanism includes at least one lock/slide held on the housing or on the access hood/access lid so as to be longitudinally displaceable and is provided with a ramp and an undercut or detent lug spaced therefrom. The access hood/access lid or the housing is provided with at least one protrusion which is formed and/or arranged for defining two engagement means in such a manner that depending on the current sliding position of the lock/slide, it alternately comes into operative engagement with the associated detent lug for pulling the access hood/access lid toward the housing, or with the ramp for pushing it away from the housing.