Ultrasonic fork height measuring apparatus

Details Ultrasonic fork height measuring apparatus Ultrasonic fork height measuring apparatus

1979-07-16

1981-07-21

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With beam steering, scanning, or focussing

367127, 187 9E, 116226, G01S 1100, B66B 302

Patent

active

042802059

ABSTRACT:
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 mounted by means of springs which provide vibration isolation between the casing and the transducer.

REFERENCES:
patent: 2790513 (1957-04-01), Draxler
patent: 3319816 (1967-05-01), Christenson
patent: 3554013 (1971-01-01), Berg
patent: 4146869 (1979-03-01), Snyder

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