| 摘要 |
An alarm system is connected to conventional elevator control apparatus. If the inside elevator doors are opened between floors, the conventional switch responsive to such opening will actuate timing means in the alarm system. If the inner doors remain open for a predetermined time interval, a main alarm switch will become operative (1) to signal a remote control station, (2) to energize a local portable alarm, and (3) to deenergize the main elevator drive motor until the main alarm switch is reset.
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