Aerial lift for lifting operator/object, has sensors and magnet generating signal representing range of relative position between parts movable with respect to one another based on mast extension and comparator verifying signals coherence

摘要

The lift (1) has a measuring device (8) formed of a cable (81), a drum (82) and a potentiometer (83) for measuring a length (L6) of a telescopic mast (6) and delivering an output signal (S1) representing the length. Proximity sensors and a magnet are independent of the device and generate a signal (S2) that represents a range of relative position between telescopic parts such as a cylinder (631) and a rod (633) of a control piston (63), where the parts are movable with respect to one another based on an extension (F5) of the mast. A comparator (9) verifies a coherence between the two signals. An independent claim is also included for a method of controlling an aerial lift.