| 摘要 |
<p>In a safety mechanism intended for preventing the locking up of persons in cabinets, in particular bank strong-rooms, is incorporated a main latch bolt (5) which is movable between an inoperative position and a protruding position in which it abuts against the cabinet door (1) and the associated frame (3) and thereby prevents the closing of the door. In its protruding position the main latch bolt (5) is arrested by an auxiliary latch bolt (14) which, like the main latch bolt, is spring-loaded towards the protruding position. Each of the latch bolts is associated with an electromagnet (11, 16), which electromagnets cause, when energized, the retraction of the latch bolts to their inoperative position and are incorporated in a common electric circuit (17) comprising an automatic switch (7) in the cabinet floor (6). Normally, this switch is closed, but it is automatically opened when a person steps on the floor of the cabinet, preventing thereby the energization of the two electromagnets (11 and 16) and consequently the retraction of the latch bolts.</p> |
