CRANE ARROW WITH VARIABLE RANGE, WITH AUTOMATIC BALANCING DEVICE

摘要

THE INVENTION CONCERNS THE AUTOMATIC BALANCING OF THE ARROW OF CRANES OF THE TYPE WITH ARTICULATED ARMS OR WITH TELESCOPIC ARMS, ACCORDING TO THE VARIATION IN THE RANGE OF THIS ARROW. /P P ANNULAR SECTION CHAMBERS 28 CONTROL 10 OF THE AUXILIARY ARM 7 OF THE CRANE AND 29 OF THE CONTROL JACK 16 OF THE PIVOTING ARM 13 CARRYING THE COUNTERWEIGHT 14 ARE CONNECTED IN SERIES BY A CONDUIT 27. THE FULL SECTION CHAMBERS 24 AND 26 OF THE JACKS 10 AND 16 ARE SELECTIVELY CONNECTED , BY OPERATION OF A DISTRIBUTOR 20, EITHER THE PRESSURE CONDUIT 21, OR THE RETURN CONDUIT 22. IN THE RIGHT POSITION OF THE DISTRIBUTOR 20, THE COUNTERWEIGHT 14 IS TIPPED AND THE ARM 7 IS SIMULTANEOUSLY RAISED, AS WELL AS IN THE POSITION OPPOSITE FROM THE DISTRIBUTOR THE ARM 7 IS LOWERED AND THE COUNTERWEIGHT 14 IS RAISED.