Verfahren zum Messen nichtelektrischer Groessen mit einem aktiven Messglied und entsprechende Messgeraete

摘要

A self-propelled crane is provided with a mast pivoted on a rotatable platform for movement between a horizontal and a vertical position. A telescopic jib is pivoted on the mast and the same cable and winch used to raise and lower a load from the tip of the jib is used to extend the jib when the telescopic jib sections are unlatched from each other. The same cable and winch may be used to raise the mast to the vertical position by securing the end of the cable to a stationary point below the pivot point of the mast. The mast may also be telescopic and a second cable and winch may be used to control both the angle of the jib relative to the mast and the extension of the telescopic mast when the parts thereof are unlatched from each other.