Elevator hatch door monitoring system

B - Operations – Transporting – 66 – B

Patent

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Details

B66B 5/02 (2006.01) B66B 13/14 (2006.01)

Patent

CA 2220488

An elevator system door monitoring system determines if any hatch door at any floor along an elevator shaft is opened while an elevator cab is away from the door. The system includes a plurality of non-contact hatch monitors, such as infrared proximity detectors. At least one monitor is positioned on the elevator shaft at a respective location generally opposite each hatch door without direct contact therewith, e.g., by directing radiation toward the door and measuring the distance to the door. If the distance is too great, indicating that the door is open and no elevator is present, the monitor produces an alarm signal. The alarm signal is set to a control circuit that takes the elevator out of service and operates audible and visual alarms.

Un système de surveillance des portes d'un ascenseur détermine si une porte palière (24) est ouverte à un niveau quelconque, sur une gaine d'ascenseur, alors qu'il n'y a pas de cabine devant cette porte. Le système comprend plusieurs dispositifs sans contact (10) de surveillance des portes, tels que des détecteurs de proximité à infrarouges. Au moins l'un des dispositifs de surveillance est placé dans la gaine de l'ascenseur à un emplacement approprié, généralement en face de chaque porte palière, sans contact direct avec elle; par exemple, il dirige un rayonnement vers cette porte et mesure la distance qui la sépare de lui. Si cette distance est trop grande, ce qui indique que la porte est ouverte en l'absence de cabine, le dispositif de surveillance produit un signal d'alarme qui est envoyé à un circuit de commande. Celui-ci met l'ascenseur hors service et déclenche des signaux d'alarme, visuel et sonore (60, 62).

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