Group control for elevators with load dependent control of the cars

A group control for elevators with load-dependent control of the cars, including call registering devices arranged on the floors by means of which calls for desired floors of destination can be entered, floor and car call memories assigned to the elevators of the group, which memories are connected with the call registering devices where at the input of calls at a floor a call characterizing the floor of input is stored in the floor call memory and the calls characterizing the floors of destination are stored in the car call memory, load measuring devices provided in the cars of the group of elevators which are connected with load memories, selectors assigned to each elevator of the group indicating in each case the floor of a possible stop, first and second scanners assigned to each elevator of the group exhibiting for each floor at least one position, a device whereby the entered calls of the cars are assigned to the group of elevators and having for each elevator a computer and a comparison device and the computer calculates at every floor designated by the first scanner from data specific to the elevator operating costs corresponding to the waiting times of the passengers, and having an assignment memory and a cost memory and the operating costs of all cars at every position of the second scanner are compared with each other by means of the comparison device and the respective call is assigned to that car which exhibits the smallest operating coats by storage in the assignment memory, and an overload control device comprising:

• first circuits assigned to the floors serviced by an elevator car and connected with a selector, a load memory, an assignment memory and a floor call memory, said first circuits being activated at every position of the selector for preventing the car from servicing an assigned call if at a stop at the associated floor an overload would be generated in the car;
• and
• second circuits assigned to the upward and downward directions for the floors and connected with the selector and said first circuits, said second circuits being connected with each other and activated at every position of the selector, whereby after passing of said associated floor and reaching the point of reversal of the direction of travel, the car travels back to said associated floor without interruption and correspondingly services said assigned call entered there.