Elevator derailment detecting device
AssigneeMitsubishi Electric Corporation
InventorKazuaki KOIDE
Life of this patent
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Abstract
An elevator derailment detecting device according to the present invention detects the opened and closed states of contacts at first and second safety relays 82 and 83 (steps S1 and S2). Since a first NO contact 82b is closed, a first NC contact 82c is opened, a second NO contact 83b is closed, and a second NC contact 83c is opened, it is determined that there is no circuit failure. Then, the opened and closed state of the contactless relay 84 is detected (step S3). When the contactless relay NO contact 84b is closed and the contactless relay NC contact 84c is opened, it is determined that the counterweight 21 of the elevator 11 is in a derailed state.
Claims16
An elevator derailment detecting device, comprising:
- an ascending and descending part;
- a guide rail which guides the ascending and descending part to be lifted and lowered;
- first and second conductor wires disposed parallel to a direction in which the ascending and descending part is lifted and lowered;
- a contact as a conductor disposed at the ascending and descending part and positioned near the first and second conductor wires;
- a first DC power supply unit which applies a first DC voltage to the first conductor wire;
- and
- a second DC power supply unit which applies a second DC voltage to the second conductor wire;
- and
- a different voltage detector which detects a voltage at the second conductor wire, wherein
- the first and second DC voltages have different values, and
- the contact contacts the first and second guide wires when the ascending and descending part is derailed from the guide rail, so that a DC voltage is generated at the second conductor wire and detected by the different voltage detector.
Dependencies are inferred from the claim text.