ULTRASONIC FORK HEIGHT MEASURING APPARATUS

摘要

BF/AN 6778 ULTRASONIC FORK HEIGHT MEASURING APPARATUS The height to which the forks of a lift truck are raised is measured by an ultrasonic height measuring arrangement including a downward facing transmitting transducer, positioned on the truck platform in fixed position with respect to the forks, and a downward facing ultrasonic receiving transducer which receives ultrasonic acoustic energy waves reflected by an upward facing parabolic reflector. The receiving transducer is positioned in a casing substantially at the focal point of the parabolic reflector and is moutned by means of springs which provide vibration isolation between the casing and the transducer.