| 摘要 |
A speed governor includes: a centrifugal weight that revolves around a predetermined revolving shaft in response to movement of a car; an extensible body to which the centrifugal weight is connected, and that is rotated around the revolving shaft, the extensible body being displaced relative to the revolving shaft in response to a centrifugal force to which the centrifugal weight is subjected due to the revolution; a switching apparatus that extends and retracts the extensible body in response to an elevator operational state; and an operation detecting apparatus that detects whether a state of the extensible body is an extended state in which the extensible body is extended or a retracted state in which the extensible body is retracted. A controlling apparatus determines presence or absence of an abnormality in the speed governor by comparing the elevator operational state and detection results from the operation detecting apparatus. |
