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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0436933 (1995-05-08) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 59 인용 특허 : 0 |
An elevator door monitoring system determines if any hatch door at any floor along an elevator shaft or any other door leading to the shaft is opened while an elevator cab is away from the door. The system includes a plurality of non-contact hatch door monitors, such as infrared proximity detectors.
An elevator shaft door monitoring system which determines if any door to an elevator shaft at any floor along the elevator shaft is opened while an elevator cab is away from the door, comprising: at least two non-contact door monitors being provided at a floor, each door monitor being mounted in the
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