Telescopic boom with movement proportioned by cylinders in series

Abstract

Abstract IN A TELESCOPIC BOOM OF THREE OR MORE SECTIONS, THE STAGES OF TELESCOPIC ACTION ARE MADE TO KEEP PACE WITH ONE ANOTHER BY POWERING THE TELESCOPIC MOVEMENTS BY CYLINDERS WHICH ARE CONNECTED IN SERIES SO THAT THE DISCHARGE FROM ONE POWERS THE NEXT. WITH A PREFERRED THREESECTION SYSTEM, USING TWO CYLINDERS, BOTH PISTON RODS ARE CONNECTED TO THE INTERMEDIATE SECTION, THE REARMOST OF THE TWO TELESCOPING SECTIONS, AND THE HYDRAULIC CONNECTION BETWEEN THE CYLINDERS IS MADE VIA THE PISTION RODS. HENCE, THE CYLINDERS ARE HYDRAULICALLY CONNECTED TO GETHER BY A FIXED LENGTH CONDUIT. A SINGLE HOSE REEL IS SUFFICIENT, THE REELED HOSE EXTENDING TO THE MOST FORWARD MOVING CYLINDER. THE BOOM SECTION CONTROLLED BY THIS CYLINDER TELESCOPES REARWARDLY WITHIN THE OTHER SECTIONS, BUT AROUND BOTH OF THE CYLINDERS, THE PISTON OF THE NON-ADVANCING CYLINDER BEING CONNECTED TO THE BOOM PART WHICH IT ADVANCES BY A SLEEVE OR FRAME WHICH TELESCOPES ABOUT THE CYLINDER. A SMALLER DIAMETER OF CYLINDER IS USED FOR EACH SUCCEEDING ADVANCING CYLINDER TO EQUALIZE THE TELESCOPIC MOVEMENTS. LINES FOR CHARGING AND BLEEDING EXTEND TO THE FORWARD ENDS OF THE CYLINDERS AND ARE PROVIDED WITH ACCESSIBLE MANUAL GATE VALVES.

Inventors

• 👤 William J Lado

Bibliographic Details