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Document ID (ISN)31952
CIS number 79-1210
ISSN - Serial title Cahiers de notes documentaires - Sécurité et hygiène du travail
Year 1979
Convention or series no.
Author(s) Vautrin J.P.
Title Anticollision for overhead travelling cranes - Description of a variable alarm-threshold device
Original title Anticollision pour ponts roulants - Description d'un dispositif à seuil d'alarme variable. [in French]
Bibliographic information 2nd quarter 1979, No.95, Note No.1177-95-79, p.209-221. Illus.
Abstract Existing fixed alarm-threshold anticollision devices, which set off the alarm when 2 overhead travelling cranes approach a predetermined critical distance, have the drawback of not making allowance for the relative speeds of the cranes and their loads. Considerations on the mathematical aspects of the problem and a brief critical analysis of fixed threshold systems are followed by a description of a variable alarm-threshold system developed by the French National Research and Safety Institute (INRS) which provides improved safety. This device is composed of an ultrasound transmitter-receiver mounted on one of the travelling cranes, an electronic data logging device which translates into signals the ultrasonic waves reflected off the other crane, giving data on the distance between the 2 cranes and their relative speed. This data is fed into an electronic data processing/alarm unit. Tests carried out over a number of years on the prototype were satisfactory and industrial production is now under way.
Descriptors (primary) automatic alarms; overhead travelling cranes; anticollision devices; travel limiting devices
Descriptors (secondary) description of equipment; mathematical analysis; proximity detector guards; electronic controls
Document type -
Subject(s) Materials handling and storage
Broad subject area(s)
Browse category(ies) Cranes