Hydraulic elevator safety device, and method for detecting open-door travel abnormality in hydraulic elevator
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United States of America Patent
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Sep 8, 2020
Grant Date -
Dec 27, 2018
app pub date -
Jul 17, 2015
filing date -
Jul 17, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A safety device for a hydraulic elevator includes an open-door running prevention unit and a pressure sensor. The open-door running prevention unit includes a memory configured to sequentially store values of the pressure sensor during a period in which the hydraulic elevator is in the open-door state as time-series data. When it is determined that the car speed, detected when the hydraulic elevator is in the open-door state, is equal to or larger than a preset first threshold value, the open-door running prevention unit calculates a differential value between a maximum value and a minimum value of the time-series data stored in the memory in a period of a preset determination time. When the differential value is out of a preset allowable range, the open-door running prevention unit determines that the open-door running abnormality is present, and executes the car braking processing.
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