| 摘要 |
A switching apparatus operatively associated with each elevator of an elevator group operated by means of a collective control and individual travel control serves the purpose, for instance in hospitals, of switching one or more elevators from one control mode to the other control mode. The switching apparatus comprises four series connected switching stages formed of digital logic or switching elements. By activating one of the key switches of the first switching stage there is initiated the switching operation to the relevant other operating mode, and there are generated signals which eliminate the elevator which is to be switched over from the storey call allocation. Upon arrival of an input information or signal which signals the operating state "free" of the elevator which is to be switched over, there is accomplished allocation to the desired operating mode by freeing the correlated door control by means of output signals produced in the second switching stage. A timing element of the third switching stage, after expiration of a control time, prior to allocation at the desired operating mode, generates a signal interrupting the cabin call transmitter supply. After servicing the last call which is located in the momentary travel direction of the cabin, the fourth switching stage produces a signal which extinguishes the still stored cabin calls and a signal which blocks the door closing operation until emptying of the elevator cabin.
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