Hoisting boom assembly

Details Hoisting boom assembly Hoisting boom assembly

B - Operations, Transporting

66

C

B66C 23/00 (2006.01) E21B 15/04 (2006.01)

Patent

CA 2045822

(57) Abstract The invention relates to a hoisting boom assembly having its frame (R) and actuators (KT, ET, TT) coupled with a mobile working machine (TR), said hoisting boom assembly comprising; an upright column (1) associated with frame (R) and pivotable around a vertical axis by means of a rotary actuator (KT); a second boom (3) having its first section (I) journalled (4) to be pivotable in vertical plane and having its second section (II) journalled (5) to first section (I) to be also pivotable in vertical plane; a horizontal shift mechanism (VM) as well as a horizontal shift actuator (TT) for carrying in horizontal direction a free end (6) included in second boom (3); a first boom (2) fitted between upright column (1) and second boom 13) and pivotally (EN) mounted by its first end on upright column (1), preferably on the top section the-eof, and pivotally (4, 8) mounted by its second end on second boom (3); and an actuator (ET) fitted between upright column (1) and first boom (2) for pivoting said first boom (2) in vertical plane relative to upright column (1). In order to improve the performance of a hoisting boom assembly, said hoisting boom assembly further includes compensating means (EX) for equalizing the forces caused by the operation of a hoisting boom assembly, particularly in situations following and preceding a first and/or a second extreme position (TA, TB) assumed by second boom (3), whereby its first section (I) and second section (II) are pivot- ing away from or towards each other. Fig. 1

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