Step-ladder for providing access to passenger aircraft - is mounted on motor vehicle and forms part of parallelogram linkage

摘要

A step-ladder which provides access to an aircraft for the passenger is mounted on the chassis of a motor vehicle so that it can be positioned close to the aircraft. The actual ladder forms one link of a parallelogram. The ladder and its parallel link are pivoted at their lower ends to the vehicle chassis with the end part of the chassis forming part of the parallelogram. The upper ends of the ladder (2) and link (26) are pivoted to the platform (3) which forms the fourth link of the parallelogram. The step-ladder is raised and lowered by a hydraulic cylinder. ADVANTAGE - The step-ladder is suitable for use with any size of aircraft.