EXPANSION AND CONTRACTION IMPLEMENT OF TELESCOPIC BOOM OF CRANE FOR CONSTRUCTION

摘要

PURPOSE: A telescoping mechanism of a crane telescopic boom for construction is provided to stably support the telescoping mechanism of a crane telescopic boom with 3 rod connecting pins and 3 head connection pins. CONSTITUTION: The telescoping mechanism of a crane telescopic boom for construction comprises a fixing device, a piston rod(19), and a main cylinder. The piston rod includes 3 load connection pins(20) and a rod block(19a). The main cylinder moves the piston rod to the back and the forth. The fixing device fixes the top end portion of an outside boom and the bottom portion of the nearest boom of the outside boom. The fixing device is arranged in a position in which the load connection pin and the head connection pin are piled up one on another. The fixing device is arranged in three positions at an equal interval between the load connection pin and the head connection pin. The leading end of the piston rod faces downward. The main cylinder is accepted in the inner side of a telescopic boom.