| 摘要 |
An elevator safety switch for detecting closure of two parts is described. The safety switch may be used for example in doors, windows and other covers. The safety switch has two parts so that the first part includes magnetically operable switches and the second part comprises permanent magnets. In the first part the magnetically operable switches are connected in series. The first part further comprises a resistor for each of the magnetically operable switches and the resistor is connected in parallel with the respective magnetically operable switch. These two parts are arranged so that they meet when they are in use. Switch parts attached to a door meet each other when the door is closed. When these two parts meet each other the magnets are configured to change the state of the magnetically operable switches. If only one magnetically operable switch changes state it can be determined that the other magnetically operable switch may be broken. |
