Abstract: A method of and apparatus for continuously counteracting lateral oscillation of an elevator car provided with guide shoes running along guide rails by laterally displacing the guide shoes in accordance with the out-of-straightness of the guide rails by ascertaining the magnitudes of local deviations of the guide rails from a straight condition thereof and setting up in the memory of a computer controlling the guide shoes a deviation table relating the local deviations to the position of the car along the path of travel, and subsequently controlling the guide shoes by the computer in dependence on the table to displace the elevator car laterally to compensate for the local deviation at any position of the elevator car at which the local deviations occur.

Abstract: The invention concerns, first, a signalling procedure for a lift, whereby the control system and the users of the lift are informed on lift calls and the state of the lift, e.g. position, movement and availability, by using serial communication between the control system computer and the actuating and signalling means in the lift car and on each floor level, and, second, a signalling system applying the said procedure. To avoid abundant and complicated wiring and to increase standardization in the design of the lift system main panel and call button stations, the signalling system of the invention employs the polling principle in its internal communication, whereby data are transmitted bi-directionally using digital series loops, one of which connects the devices in the lift car, controlled by and communicating via a microprocessor, another connects the corresponding shaft and door devices, while a third loop is used for communication with the external world.

Abstract: A procedure for entering into an elevator control computer information specific to a particular installation of an elevator provided with operating devices capable of data transfer includes employing a computer test programme to map elevators used in the particular installation and their positions by sending out a query round to addresses which are tabulated in the computer and which represent all possible operating devices, and by inferring the kind and number of the action means present in the installation on the basis of the answers received in the query round. During a test travel of the elevator, by activating and reading the devices the location of the devices, the geometry of the building and the distances between floors are sensed. All the information thus received and which is necessary for controlling the elevator is stored permanently in the memory of the control computer, to enable normal operation of the elevator in the installation.

Abstract: A method and an apparatus for measuring the wall thickness of a plastic article, particularly of a hollow rotation-symmetrical plastic article. According to the method, the wall of the plastic article is subjected to infra-red radiation and the intensity of, e.g., the continuously transmitted radiation is measured at preselected points, said intensity being a function of the wall thickness to be measured. At the same time, on one hand, the plastic article and, on the other hand, a radiation source and/or a radiation detector are set in an axial and rotational movement in relation to each other.