U.s. pat. no. of articulation of the mat of arrow telescopic sliding and its system of articulation

摘要

Telescopic mast, of mobile crane, has several elements (A, B, C, D), sliding relative to each other. Mast is carried by chassis, fixed or rotating, such that it pivots from low position to high position, around horizontal axis, using jack (H). Mast is also designed such that element (C) has two parts (C' and C), hinged together, to allow relative rotation between two parts.