| 摘要 |
The floor of a structure has a pair of spaced pits therein, within the first of which a security safe is disposed, said pit having a removable cover. A concealed shaft extends between the pits, and has latch and lock arms secured to the opposite ends thereof, the arms being simultaneously movable between first and second pivotal positions, and the lock arm being disposed in the second pit. The latch arm is disposed in the first pit and carries latch means engageable with mating latch means on the cover when the arms are in their first pivotal position. A releasable lock is used to secure the lock arm in its first pivotal position, and an alarm system is arranged to give an alarm upon unauthorized movement of said arms from their first pivotal position.
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