Patent ID: 8875410

Claim:
A measuring device for a telescopic handling arm with at least two elements ( 1 , 2 ) mounted to slide relative to each other, comprising: measuring means for measuring an extension of the telescopic arm; calculation means ( 4 ) for calculating an extension of a movable portion ( 2 ) of the telescopic handling arm using hydraulic characteristics of a hydraulic telescoping actuator ( 3 ); and adjuster means for adjusting calculations of the calculation means by means of a signal transmitted by at least one means for contactless identification of a position of the movable portion ( 2 ) of the telescopic handling arm, wherein the means for contactless identification comprises a plurality of spaced-apart markers ( 6 ), secured to the movable portion of the telescopic handling arm, that are able to be identified as they pass in front of at least one contactless sensor ( 5 ) that is secured to a stationary portion of the telescopic handling arm, and wherein the calculation means ( 4 ) use a hydraulic flowrate and a duration of activation of the hydraulic telescoping actuator ( 3 ).