The ingress to and egress from an access restricted compartment, such as the
cockpit in an aircraft, is controlled by a revolving gate (1) rotatably
mounted in a stationary gate frame (2). The revolving gate (1) has
a single gate opening (11) and is rotatable about its central longitudinal
axis through predetermined or preselected angular sectors to bring the gate opening
(11) either into alignment with any one opening (21) of at least
two frame openings (21) at a time, to provide ingress or egress, or to cause
said single gate opening (11) to face a wall (2A) of said stationary
gate frame (2) or a closed door (51) in said stationary gate frame
(2) to close the gate (1). In the closed position of the gate (1)
escape from the gate (1) is prevented by locking the gate in its closed
position by at least one arresting bolt that is electrically controllable. The
atmosphere in the revolving gate (1) is also controllable for incapacitating
any unauthorized intruder.
