Personnel safety system for goods vehicles using overhead lifting cranes has a number of optical sensors arranged to detect the presence of people behind the reversing vehicle

摘要

The vehicle (1) is reversed into position beneath the crane (7) and light sources and receivers (8,9,10,11) and the vehicle detectors (5,6) result in a warning signal lamp (4) and a horn (2) to indicate the presence of personnel in danger, or a green lamp (3) to show clearance.